Modified config to support Docker. #1

barooney · 2019-02-11T20:35:41Z

I've added Docker support to the PS4 Linux kernel.

So far, I didn't run into any issues with neither the OS itself nor the Docker runtime, but you might need to do some thorough testing.

StoneyEagle · 2019-10-13T13:39:03Z

I am using this modification for a while and somehow it functions better than my Ryzen pc.
docker/for-win#4383 (comment)
This should be intergrated in to the distro in my opinion.

smp_processor_id() checks preemption if CONFIG_DEBUG_PREEMPT is enabled, causing a warning dump during boot: [ 5.042377] BUG: using smp_processor_id() in preemptible [00000000] code: swapper/0/1 [ 5.050281] caller is pwrdm_set_next_pwrst+0x48/0x88 [ 5.055330] CPU: 1 PID: 1 Comm: swapper/0 Not tainted 4.14.24-g57341df0b4 Ps3itaTeam#1 Use the raw_smp_processor_id() for the trace instead, this value does not need to be perfectly correct. The alternative of disabling preempt is too heavy weight operation to be applied in PM hot path for just tracing purposes. Signed-off-by: Tero Kristo <t-kristo@ti.com> Signed-off-by: Tony Lindgren <tony@atomide.com>

…s found If an OVS_ATTR_NESTED attribute type is found while walking through netlink attributes, we call nlattr_set() recursively passing the length table for the following nested attributes, if different from the current one. However, once we're done with those sub-nested attributes, we should continue walking through attributes using the current table, instead of using the one related to the sub-nested attributes. For example, given this sequence: 1 OVS_KEY_ATTR_PRIORITY 2 OVS_KEY_ATTR_TUNNEL 3 OVS_TUNNEL_KEY_ATTR_ID 4 OVS_TUNNEL_KEY_ATTR_IPV4_SRC 5 OVS_TUNNEL_KEY_ATTR_IPV4_DST 6 OVS_TUNNEL_KEY_ATTR_TTL 7 OVS_TUNNEL_KEY_ATTR_TP_SRC 8 OVS_TUNNEL_KEY_ATTR_TP_DST 9 OVS_KEY_ATTR_IN_PORT 10 OVS_KEY_ATTR_SKB_MARK 11 OVS_KEY_ATTR_MPLS we switch to the 'ovs_tunnel_key_lens' table on attribute Ps3itaTeam#3, and we don't switch back to 'ovs_key_lens' while setting attributes torvalds#9 to torvalds#11 in the sequence. As OVS_KEY_ATTR_MPLS evaluates to 21, and the array size of 'ovs_tunnel_key_lens' is 15, we also get this kind of KASan splat while accessing the wrong table: [ 7654.586496] ================================================================== [ 7654.594573] BUG: KASAN: global-out-of-bounds in nlattr_set+0x164/0xde9 [openvswitch] [ 7654.603214] Read of size 4 at addr ffffffffc169ecf0 by task handler29/87430 [ 7654.610983] [ 7654.612644] CPU: 21 PID: 87430 Comm: handler29 Kdump: loaded Not tainted 3.10.0-866.el7.test.x86_64 Ps3itaTeam#1 [ 7654.623030] Hardware name: Dell Inc. PowerEdge R730/072T6D, BIOS 2.1.7 06/16/2016 [ 7654.631379] Call Trace: [ 7654.634108] [<ffffffffb65a7c50>] dump_stack+0x19/0x1b [ 7654.639843] [<ffffffffb53ff373>] print_address_description+0x33/0x290 [ 7654.647129] [<ffffffffc169b37b>] ? nlattr_set+0x164/0xde9 [openvswitch] [ 7654.654607] [<ffffffffb53ff812>] kasan_report.part.3+0x242/0x330 [ 7654.661406] [<ffffffffb53ff9b4>] __asan_report_load4_noabort+0x34/0x40 [ 7654.668789] [<ffffffffc169b37b>] nlattr_set+0x164/0xde9 [openvswitch] [ 7654.676076] [<ffffffffc167ef68>] ovs_nla_get_match+0x10c8/0x1900 [openvswitch] [ 7654.684234] [<ffffffffb61e9cc8>] ? genl_rcv+0x28/0x40 [ 7654.689968] [<ffffffffb61e7733>] ? netlink_unicast+0x3f3/0x590 [ 7654.696574] [<ffffffffc167dea0>] ? ovs_nla_put_tunnel_info+0xb0/0xb0 [openvswitch] [ 7654.705122] [<ffffffffb4f41b50>] ? unwind_get_return_address+0xb0/0xb0 [ 7654.712503] [<ffffffffb65d9355>] ? system_call_fastpath+0x1c/0x21 [ 7654.719401] [<ffffffffb4f41d79>] ? update_stack_state+0x229/0x370 [ 7654.726298] [<ffffffffb4f41d79>] ? update_stack_state+0x229/0x370 [ 7654.733195] [<ffffffffb53fe4b5>] ? kasan_unpoison_shadow+0x35/0x50 [ 7654.740187] [<ffffffffb53fe62a>] ? kasan_kmalloc+0xaa/0xe0 [ 7654.746406] [<ffffffffb53fec32>] ? kasan_slab_alloc+0x12/0x20 [ 7654.752914] [<ffffffffb53fe711>] ? memset+0x31/0x40 [ 7654.758456] [<ffffffffc165bf92>] ovs_flow_cmd_new+0x2b2/0xf00 [openvswitch] [snip] [ 7655.132484] The buggy address belongs to the variable: [ 7655.138226] ovs_tunnel_key_lens+0xf0/0xffffffffffffd400 [openvswitch] [ 7655.145507] [ 7655.147166] Memory state around the buggy address: [ 7655.152514] ffffffffc169eb80: 00 00 00 00 00 00 00 00 00 00 fa fa fa fa fa fa [ 7655.160585] ffffffffc169ec00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 7655.168644] >ffffffffc169ec80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 fa fa [ 7655.176701] ^ [ 7655.184372] ffffffffc169ed00: fa fa fa fa 00 00 00 00 fa fa fa fa 00 00 00 05 [ 7655.192431] ffffffffc169ed80: fa fa fa fa 00 00 00 00 00 00 00 00 00 00 00 00 [ 7655.200490] ================================================================== Reported-by: Hangbin Liu <liuhangbin@gmail.com> Fixes: 982b527 ("openvswitch: Fix mask generation for nested attributes.") Signed-off-by: Stefano Brivio <sbrivio@redhat.com> Reviewed-by: Sabrina Dubroca <sd@queasysnail.net> Signed-off-by: David S. Miller <davem@davemloft.net>

syzbot caught an infinite recursion in nsh_gso_segment(). Problem here is that we need to make sure the NSH header is of reasonable length. BUG: MAX_LOCK_DEPTH too low! turning off the locking correctness validator. depth: 48 max: 48! 48 locks held by syz-executor0/10189: #0: (ptrval) (rcu_read_lock_bh){....}, at: __dev_queue_xmit+0x30f/0x34c0 net/core/dev.c:3517 Ps3itaTeam#1: (ptrval) (rcu_read_lock){....}, at: __skb_pull include/linux/skbuff.h:2080 [inline] Ps3itaTeam#1: (ptrval) (rcu_read_lock){....}, at: skb_mac_gso_segment+0x221/0x720 net/core/dev.c:2787 Ps3itaTeam#2: (ptrval) (rcu_read_lock){....}, at: __skb_pull include/linux/skbuff.h:2080 [inline] Ps3itaTeam#2: (ptrval) (rcu_read_lock){....}, at: skb_mac_gso_segment+0x221/0x720 net/core/dev.c:2787 Ps3itaTeam#3: (ptrval) (rcu_read_lock){....}, at: __skb_pull include/linux/skbuff.h:2080 [inline] Ps3itaTeam#3: (ptrval) (rcu_read_lock){....}, at: skb_mac_gso_segment+0x221/0x720 net/core/dev.c:2787 fail0verflow#4: (ptrval) (rcu_read_lock){....}, at: __skb_pull include/linux/skbuff.h:2080 [inline] fail0verflow#4: (ptrval) (rcu_read_lock){....}, at: skb_mac_gso_segment+0x221/0x720 net/core/dev.c:2787 fail0verflow#5: (ptrval) (rcu_read_lock){....}, at: __skb_pull include/linux/skbuff.h:2080 [inline] fail0verflow#5: (ptrval) (rcu_read_lock){....}, at: skb_mac_gso_segment+0x221/0x720 net/core/dev.c:2787 fail0verflow#6: (ptrval) (rcu_read_lock){....}, at: __skb_pull include/linux/skbuff.h:2080 [inline] fail0verflow#6: (ptrval) (rcu_read_lock){....}, at: skb_mac_gso_segment+0x221/0x720 net/core/dev.c:2787 torvalds#7: (ptrval) (rcu_read_lock){....}, at: __skb_pull include/linux/skbuff.h:2080 [inline] torvalds#7: (ptrval) (rcu_read_lock){....}, at: skb_mac_gso_segment+0x221/0x720 net/core/dev.c:2787 torvalds#8: (ptrval) (rcu_read_lock){....}, at: __skb_pull include/linux/skbuff.h:2080 [inline] torvalds#8: (ptrval) (rcu_read_lock){....}, at: skb_mac_gso_segment+0x221/0x720 net/core/dev.c:2787 torvalds#9: (ptrval) (rcu_read_lock){....}, at: __skb_pull include/linux/skbuff.h:2080 [inline] torvalds#9: (ptrval) (rcu_read_lock){....}, at: skb_mac_gso_segment+0x221/0x720 net/core/dev.c:2787 torvalds#10: (ptrval) (rcu_read_lock){....}, at: __skb_pull include/linux/skbuff.h:2080 [inline] torvalds#10: (ptrval) (rcu_read_lock){....}, at: skb_mac_gso_segment+0x221/0x720 net/core/dev.c:2787 torvalds#11: (ptrval) (rcu_read_lock){....}, at: __skb_pull include/linux/skbuff.h:2080 [inline] torvalds#11: (ptrval) (rcu_read_lock){....}, at: skb_mac_gso_segment+0x221/0x720 net/core/dev.c:2787 torvalds#12: (ptrval) (rcu_read_lock){....}, at: __skb_pull include/linux/skbuff.h:2080 [inline] torvalds#12: (ptrval) (rcu_read_lock){....}, at: skb_mac_gso_segment+0x221/0x720 net/core/dev.c:2787 torvalds#13: (ptrval) (rcu_read_lock){....}, at: __skb_pull include/linux/skbuff.h:2080 [inline] torvalds#13: (ptrval) (rcu_read_lock){....}, at: skb_mac_gso_segment+0x221/0x720 net/core/dev.c:2787 torvalds#14: (ptrval) (rcu_read_lock){....}, at: __skb_pull include/linux/skbuff.h:2080 [inline] torvalds#14: (ptrval) (rcu_read_lock){....}, at: skb_mac_gso_segment+0x221/0x720 net/core/dev.c:2787 torvalds#15: (ptrval) (rcu_read_lock){....}, at: __skb_pull include/linux/skbuff.h:2080 [inline] torvalds#15: (ptrval) (rcu_read_lock){....}, at: skb_mac_gso_segment+0x221/0x720 net/core/dev.c:2787 torvalds#16: (ptrval) (rcu_read_lock){....}, at: __skb_pull include/linux/skbuff.h:2080 [inline] torvalds#16: (ptrval) (rcu_read_lock){....}, at: skb_mac_gso_segment+0x221/0x720 net/core/dev.c:2787 torvalds#17: (ptrval) (rcu_read_lock){....}, at: __skb_pull include/linux/skbuff.h:2080 [inline] torvalds#17: (ptrval) (rcu_read_lock){....}, at: skb_mac_gso_segment+0x221/0x720 net/core/dev.c:2787 torvalds#18: (ptrval) (rcu_read_lock){....}, at: __skb_pull include/linux/skbuff.h:2080 [inline] torvalds#18: (ptrval) (rcu_read_lock){....}, at: skb_mac_gso_segment+0x221/0x720 net/core/dev.c:2787 torvalds#19: (ptrval) (rcu_read_lock){....}, at: __skb_pull include/linux/skbuff.h:2080 [inline] torvalds#19: (ptrval) (rcu_read_lock){....}, at: skb_mac_gso_segment+0x221/0x720 net/core/dev.c:2787 torvalds#20: (ptrval) (rcu_read_lock){....}, at: __skb_pull include/linux/skbuff.h:2080 [inline] torvalds#20: (ptrval) (rcu_read_lock){....}, at: skb_mac_gso_segment+0x221/0x720 net/core/dev.c:2787 torvalds#21: (ptrval) (rcu_read_lock){....}, at: __skb_pull include/linux/skbuff.h:2080 [inline] torvalds#21: (ptrval) (rcu_read_lock){....}, at: skb_mac_gso_segment+0x221/0x720 net/core/dev.c:2787 torvalds#22: (ptrval) (rcu_read_lock){....}, at: __skb_pull include/linux/skbuff.h:2080 [inline] torvalds#22: (ptrval) (rcu_read_lock){....}, at: skb_mac_gso_segment+0x221/0x720 net/core/dev.c:2787 torvalds#23: (ptrval) (rcu_read_lock){....}, at: __skb_pull include/linux/skbuff.h:2080 [inline] torvalds#23: (ptrval) (rcu_read_lock){....}, at: skb_mac_gso_segment+0x221/0x720 net/core/dev.c:2787 torvalds#24: (ptrval) (rcu_read_lock){....}, at: __skb_pull include/linux/skbuff.h:2080 [inline] torvalds#24: (ptrval) (rcu_read_lock){....}, at: skb_mac_gso_segment+0x221/0x720 net/core/dev.c:2787 torvalds#25: (ptrval) (rcu_read_lock){....}, at: __skb_pull include/linux/skbuff.h:2080 [inline] torvalds#25: (ptrval) (rcu_read_lock){....}, at: skb_mac_gso_segment+0x221/0x720 net/core/dev.c:2787 torvalds#26: (ptrval) (rcu_read_lock){....}, at: __skb_pull include/linux/skbuff.h:2080 [inline] torvalds#26: (ptrval) (rcu_read_lock){....}, at: skb_mac_gso_segment+0x221/0x720 net/core/dev.c:2787 torvalds#27: (ptrval) (rcu_read_lock){....}, at: __skb_pull include/linux/skbuff.h:2080 [inline] torvalds#27: (ptrval) (rcu_read_lock){....}, at: skb_mac_gso_segment+0x221/0x720 net/core/dev.c:2787 torvalds#28: (ptrval) (rcu_read_lock){....}, at: __skb_pull include/linux/skbuff.h:2080 [inline] torvalds#28: (ptrval) (rcu_read_lock){....}, at: skb_mac_gso_segment+0x221/0x720 net/core/dev.c:2787 torvalds#29: (ptrval) (rcu_read_lock){....}, at: __skb_pull include/linux/skbuff.h:2080 [inline] torvalds#29: (ptrval) (rcu_read_lock){....}, at: skb_mac_gso_segment+0x221/0x720 net/core/dev.c:2787 torvalds#30: (ptrval) (rcu_read_lock){....}, at: __skb_pull include/linux/skbuff.h:2080 [inline] torvalds#30: (ptrval) (rcu_read_lock){....}, at: skb_mac_gso_segment+0x221/0x720 net/core/dev.c:2787 torvalds#31: (ptrval) (rcu_read_lock){....}, at: __skb_pull include/linux/skbuff.h:2080 [inline] torvalds#31: (ptrval) (rcu_read_lock){....}, at: skb_mac_gso_segment+0x221/0x720 net/core/dev.c:2787 dccp_close: ABORT with 65423 bytes unread torvalds#32: (ptrval) (rcu_read_lock){....}, at: __skb_pull include/linux/skbuff.h:2080 [inline] torvalds#32: (ptrval) (rcu_read_lock){....}, at: skb_mac_gso_segment+0x221/0x720 net/core/dev.c:2787 torvalds#33: (ptrval) (rcu_read_lock){....}, at: __skb_pull include/linux/skbuff.h:2080 [inline] torvalds#33: (ptrval) (rcu_read_lock){....}, at: skb_mac_gso_segment+0x221/0x720 net/core/dev.c:2787 torvalds#34: (ptrval) (rcu_read_lock){....}, at: __skb_pull include/linux/skbuff.h:2080 [inline] torvalds#34: (ptrval) (rcu_read_lock){....}, at: skb_mac_gso_segment+0x221/0x720 net/core/dev.c:2787 torvalds#35: (ptrval) (rcu_read_lock){....}, at: __skb_pull include/linux/skbuff.h:2080 [inline] torvalds#35: (ptrval) (rcu_read_lock){....}, at: skb_mac_gso_segment+0x221/0x720 net/core/dev.c:2787 torvalds#36: (ptrval) (rcu_read_lock){....}, at: __skb_pull include/linux/skbuff.h:2080 [inline] torvalds#36: (ptrval) (rcu_read_lock){....}, at: skb_mac_gso_segment+0x221/0x720 net/core/dev.c:2787 torvalds#37: (ptrval) (rcu_read_lock){....}, at: __skb_pull include/linux/skbuff.h:2080 [inline] torvalds#37: (ptrval) (rcu_read_lock){....}, at: skb_mac_gso_segment+0x221/0x720 net/core/dev.c:2787 torvalds#38: (ptrval) (rcu_read_lock){....}, at: __skb_pull include/linux/skbuff.h:2080 [inline] torvalds#38: (ptrval) (rcu_read_lock){....}, at: skb_mac_gso_segment+0x221/0x720 net/core/dev.c:2787 torvalds#39: (ptrval) (rcu_read_lock){....}, at: __skb_pull include/linux/skbuff.h:2080 [inline] torvalds#39: (ptrval) (rcu_read_lock){....}, at: skb_mac_gso_segment+0x221/0x720 net/core/dev.c:2787 torvalds#40: (ptrval) (rcu_read_lock){....}, at: __skb_pull include/linux/skbuff.h:2080 [inline] torvalds#40: (ptrval) (rcu_read_lock){....}, at: skb_mac_gso_segment+0x221/0x720 net/core/dev.c:2787 torvalds#41: (ptrval) (rcu_read_lock){....}, at: __skb_pull include/linux/skbuff.h:2080 [inline] torvalds#41: (ptrval) (rcu_read_lock){....}, at: skb_mac_gso_segment+0x221/0x720 net/core/dev.c:2787 torvalds#42: (ptrval) (rcu_read_lock){....}, at: __skb_pull include/linux/skbuff.h:2080 [inline] torvalds#42: (ptrval) (rcu_read_lock){....}, at: skb_mac_gso_segment+0x221/0x720 net/core/dev.c:2787 torvalds#43: (ptrval) (rcu_read_lock){....}, at: __skb_pull include/linux/skbuff.h:2080 [inline] torvalds#43: (ptrval) (rcu_read_lock){....}, at: skb_mac_gso_segment+0x221/0x720 net/core/dev.c:2787 torvalds#44: (ptrval) (rcu_read_lock){....}, at: __skb_pull include/linux/skbuff.h:2080 [inline] torvalds#44: (ptrval) (rcu_read_lock){....}, at: skb_mac_gso_segment+0x221/0x720 net/core/dev.c:2787 torvalds#45: (ptrval) (rcu_read_lock){....}, at: __skb_pull include/linux/skbuff.h:2080 [inline] torvalds#45: (ptrval) (rcu_read_lock){....}, at: skb_mac_gso_segment+0x221/0x720 net/core/dev.c:2787 torvalds#46: (ptrval) (rcu_read_lock){....}, at: __skb_pull include/linux/skbuff.h:2080 [inline] torvalds#46: (ptrval) (rcu_read_lock){....}, at: skb_mac_gso_segment+0x221/0x720 net/core/dev.c:2787 torvalds#47: (ptrval) (rcu_read_lock){....}, at: __skb_pull include/linux/skbuff.h:2080 [inline] torvalds#47: (ptrval) (rcu_read_lock){....}, at: skb_mac_gso_segment+0x221/0x720 net/core/dev.c:2787 INFO: lockdep is turned off. CPU: 1 PID: 10189 Comm: syz-executor0 Not tainted 4.17.0-rc2+ torvalds#26 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1b9/0x294 lib/dump_stack.c:113 __lock_acquire+0x1788/0x5140 kernel/locking/lockdep.c:3449 lock_acquire+0x1dc/0x520 kernel/locking/lockdep.c:3920 rcu_lock_acquire include/linux/rcupdate.h:246 [inline] rcu_read_lock include/linux/rcupdate.h:632 [inline] skb_mac_gso_segment+0x25b/0x720 net/core/dev.c:2789 nsh_gso_segment+0x405/0xb60 net/nsh/nsh.c:107 skb_mac_gso_segment+0x3ad/0x720 net/core/dev.c:2792 nsh_gso_segment+0x405/0xb60 net/nsh/nsh.c:107 skb_mac_gso_segment+0x3ad/0x720 net/core/dev.c:2792 nsh_gso_segment+0x405/0xb60 net/nsh/nsh.c:107 skb_mac_gso_segment+0x3ad/0x720 net/core/dev.c:2792 nsh_gso_segment+0x405/0xb60 net/nsh/nsh.c:107 skb_mac_gso_segment+0x3ad/0x720 net/core/dev.c:2792 nsh_gso_segment+0x405/0xb60 net/nsh/nsh.c:107 skb_mac_gso_segment+0x3ad/0x720 net/core/dev.c:2792 nsh_gso_segment+0x405/0xb60 net/nsh/nsh.c:107 skb_mac_gso_segment+0x3ad/0x720 net/core/dev.c:2792 nsh_gso_segment+0x405/0xb60 net/nsh/nsh.c:107 skb_mac_gso_segment+0x3ad/0x720 net/core/dev.c:2792 nsh_gso_segment+0x405/0xb60 net/nsh/nsh.c:107 skb_mac_gso_segment+0x3ad/0x720 net/core/dev.c:2792 nsh_gso_segment+0x405/0xb60 net/nsh/nsh.c:107 skb_mac_gso_segment+0x3ad/0x720 net/core/dev.c:2792 nsh_gso_segment+0x405/0xb60 net/nsh/nsh.c:107 skb_mac_gso_segment+0x3ad/0x720 net/core/dev.c:2792 nsh_gso_segment+0x405/0xb60 net/nsh/nsh.c:107 skb_mac_gso_segment+0x3ad/0x720 net/core/dev.c:2792 nsh_gso_segment+0x405/0xb60 net/nsh/nsh.c:107 skb_mac_gso_segment+0x3ad/0x720 net/core/dev.c:2792 nsh_gso_segment+0x405/0xb60 net/nsh/nsh.c:107 skb_mac_gso_segment+0x3ad/0x720 net/core/dev.c:2792 nsh_gso_segment+0x405/0xb60 net/nsh/nsh.c:107 skb_mac_gso_segment+0x3ad/0x720 net/core/dev.c:2792 nsh_gso_segment+0x405/0xb60 net/nsh/nsh.c:107 skb_mac_gso_segment+0x3ad/0x720 net/core/dev.c:2792 nsh_gso_segment+0x405/0xb60 net/nsh/nsh.c:107 skb_mac_gso_segment+0x3ad/0x720 net/core/dev.c:2792 nsh_gso_segment+0x405/0xb60 net/nsh/nsh.c:107 skb_mac_gso_segment+0x3ad/0x720 net/core/dev.c:2792 nsh_gso_segment+0x405/0xb60 net/nsh/nsh.c:107 skb_mac_gso_segment+0x3ad/0x720 net/core/dev.c:2792 nsh_gso_segment+0x405/0xb60 net/nsh/nsh.c:107 skb_mac_gso_segment+0x3ad/0x720 net/core/dev.c:2792 nsh_gso_segment+0x405/0xb60 net/nsh/nsh.c:107 skb_mac_gso_segment+0x3ad/0x720 net/core/dev.c:2792 nsh_gso_segment+0x405/0xb60 net/nsh/nsh.c:107 skb_mac_gso_segment+0x3ad/0x720 net/core/dev.c:2792 nsh_gso_segment+0x405/0xb60 net/nsh/nsh.c:107 skb_mac_gso_segment+0x3ad/0x720 net/core/dev.c:2792 nsh_gso_segment+0x405/0xb60 net/nsh/nsh.c:107 skb_mac_gso_segment+0x3ad/0x720 net/core/dev.c:2792 nsh_gso_segment+0x405/0xb60 net/nsh/nsh.c:107 skb_mac_gso_segment+0x3ad/0x720 net/core/dev.c:2792 nsh_gso_segment+0x405/0xb60 net/nsh/nsh.c:107 skb_mac_gso_segment+0x3ad/0x720 net/core/dev.c:2792 nsh_gso_segment+0x405/0xb60 net/nsh/nsh.c:107 skb_mac_gso_segment+0x3ad/0x720 net/core/dev.c:2792 nsh_gso_segment+0x405/0xb60 net/nsh/nsh.c:107 skb_mac_gso_segment+0x3ad/0x720 net/core/dev.c:2792 nsh_gso_segment+0x405/0xb60 net/nsh/nsh.c:107 skb_mac_gso_segment+0x3ad/0x720 net/core/dev.c:2792 nsh_gso_segment+0x405/0xb60 net/nsh/nsh.c:107 skb_mac_gso_segment+0x3ad/0x720 net/core/dev.c:2792 nsh_gso_segment+0x405/0xb60 net/nsh/nsh.c:107 skb_mac_gso_segment+0x3ad/0x720 net/core/dev.c:2792 nsh_gso_segment+0x405/0xb60 net/nsh/nsh.c:107 skb_mac_gso_segment+0x3ad/0x720 net/core/dev.c:2792 nsh_gso_segment+0x405/0xb60 net/nsh/nsh.c:107 skb_mac_gso_segment+0x3ad/0x720 net/core/dev.c:2792 nsh_gso_segment+0x405/0xb60 net/nsh/nsh.c:107 skb_mac_gso_segment+0x3ad/0x720 net/core/dev.c:2792 nsh_gso_segment+0x405/0xb60 net/nsh/nsh.c:107 skb_mac_gso_segment+0x3ad/0x720 net/core/dev.c:2792 nsh_gso_segment+0x405/0xb60 net/nsh/nsh.c:107 skb_mac_gso_segment+0x3ad/0x720 net/core/dev.c:2792 nsh_gso_segment+0x405/0xb60 net/nsh/nsh.c:107 skb_mac_gso_segment+0x3ad/0x720 net/core/dev.c:2792 nsh_gso_segment+0x405/0xb60 net/nsh/nsh.c:107 skb_mac_gso_segment+0x3ad/0x720 net/core/dev.c:2792 nsh_gso_segment+0x405/0xb60 net/nsh/nsh.c:107 skb_mac_gso_segment+0x3ad/0x720 net/core/dev.c:2792 nsh_gso_segment+0x405/0xb60 net/nsh/nsh.c:107 skb_mac_gso_segment+0x3ad/0x720 net/core/dev.c:2792 nsh_gso_segment+0x405/0xb60 net/nsh/nsh.c:107 skb_mac_gso_segment+0x3ad/0x720 net/core/dev.c:2792 nsh_gso_segment+0x405/0xb60 net/nsh/nsh.c:107 skb_mac_gso_segment+0x3ad/0x720 net/core/dev.c:2792 nsh_gso_segment+0x405/0xb60 net/nsh/nsh.c:107 skb_mac_gso_segment+0x3ad/0x720 net/core/dev.c:2792 nsh_gso_segment+0x405/0xb60 net/nsh/nsh.c:107 skb_mac_gso_segment+0x3ad/0x720 net/core/dev.c:2792 nsh_gso_segment+0x405/0xb60 net/nsh/nsh.c:107 skb_mac_gso_segment+0x3ad/0x720 net/core/dev.c:2792 nsh_gso_segment+0x405/0xb60 net/nsh/nsh.c:107 skb_mac_gso_segment+0x3ad/0x720 net/core/dev.c:2792 nsh_gso_segment+0x405/0xb60 net/nsh/nsh.c:107 skb_mac_gso_segment+0x3ad/0x720 net/core/dev.c:2792 __skb_gso_segment+0x3bb/0x870 net/core/dev.c:2865 skb_gso_segment include/linux/netdevice.h:4025 [inline] validate_xmit_skb+0x54d/0xd90 net/core/dev.c:3118 validate_xmit_skb_list+0xbf/0x120 net/core/dev.c:3168 sch_direct_xmit+0x354/0x11e0 net/sched/sch_generic.c:312 qdisc_restart net/sched/sch_generic.c:399 [inline] __qdisc_run+0x741/0x1af0 net/sched/sch_generic.c:410 __dev_xmit_skb net/core/dev.c:3243 [inline] __dev_queue_xmit+0x28ea/0x34c0 net/core/dev.c:3551 dev_queue_xmit+0x17/0x20 net/core/dev.c:3616 packet_snd net/packet/af_packet.c:2951 [inline] packet_sendmsg+0x40f8/0x6070 net/packet/af_packet.c:2976 sock_sendmsg_nosec net/socket.c:629 [inline] sock_sendmsg+0xd5/0x120 net/socket.c:639 __sys_sendto+0x3d7/0x670 net/socket.c:1789 __do_sys_sendto net/socket.c:1801 [inline] __se_sys_sendto net/socket.c:1797 [inline] __x64_sys_sendto+0xe1/0x1a0 net/socket.c:1797 do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x49/0xbe Fixes: c411ed8 ("nsh: add GSO support") Signed-off-by: Eric Dumazet <edumazet@google.com> Cc: Jiri Benc <jbenc@redhat.com> Reported-by: syzbot <syzkaller@googlegroups.com> Acked-by: Jiri Benc <jbenc@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>

This patch fixes crashes during boot for HVM guests on older (pre HVM vector callback) Xen versions. Without this, current kernels will always fail to boot on those Xen versions. Sample stack trace: BUG: unable to handle kernel paging request at ffffffffff200000 IP: __xen_evtchn_do_upcall+0x1e/0x80 PGD 1e0e067 P4D 1e0e067 PUD 1e10067 PMD 235c067 PTE 0 Oops: 0002 [Ps3itaTeam#1] SMP PTI Modules linked in: CPU: 0 PID: 512 Comm: kworker/u2:0 Not tainted 4.14.33-52.13.amzn1.x86_64 Ps3itaTeam#1 Hardware name: Xen HVM domU, BIOS 3.4.3.amazon 11/11/2016 task: ffff88002531d700 task.stack: ffffc90000480000 RIP: 0010:__xen_evtchn_do_upcall+0x1e/0x80 RSP: 0000:ffff880025403ef0 EFLAGS: 00010046 RAX: ffffffff813cc760 RBX: ffffffffff200000 RCX: ffffc90000483ef0 RDX: ffff880020540a00 RSI: ffff880023c78000 RDI: 000000000000001c RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: ffff880025403f5c R14: 0000000000000000 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff880025400000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffff200000 CR3: 0000000001e0a000 CR4: 00000000000006f0 Call Trace: <IRQ> do_hvm_evtchn_intr+0xa/0x10 __handle_irq_event_percpu+0x43/0x1a0 handle_irq_event_percpu+0x20/0x50 handle_irq_event+0x39/0x60 handle_fasteoi_irq+0x80/0x140 handle_irq+0xaf/0x120 do_IRQ+0x41/0xd0 common_interrupt+0x7d/0x7d </IRQ> During boot, the HYPERVISOR_shared_info page gets remapped to make it work with KASLR. This means that any pointer derived from it needs to be adjusted. The only value that this applies to is the vcpu_info pointer for VCPU 0. For PV and HVM with the callback vector feature, this gets done via the smp_ops prepare_boot_cpu callback. Older Xen versions do not support the HVM callback vector, so there is no Xen-specific smp_ops set up in that scenario. So, the vcpu_info pointer for VCPU 0 never gets set to the proper value, and the first reference of it will be bad. Fix this by resetting it immediately after the remap. Signed-off-by: Frank van der Linden <fllinden@amazon.com> Reviewed-by: Eduardo Valentin <eduval@amazon.com> Reviewed-by: Alakesh Haloi <alakeshh@amazon.com> Reviewed-by: Vallish Vaidyeshwara <vallish@amazon.com> Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com> Cc: Juergen Gross <jgross@suse.com> Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com> Cc: xen-devel@lists.xenproject.org Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>

syzbot loves to set very small mtu on devices, since it brings joy. We must make llc_ui_sendmsg() fool proof. usercopy: Kernel memory overwrite attempt detected to wrapped address (offset 0, size 18446612139802320068)! kernel BUG at mm/usercopy.c:100! invalid opcode: 0000 [Ps3itaTeam#1] SMP KASAN Dumping ftrace buffer: (ftrace buffer empty) Modules linked in: CPU: 0 PID: 17464 Comm: syz-executor1 Not tainted 4.17.0-rc3+ torvalds#36 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:usercopy_abort+0xbb/0xbd mm/usercopy.c:88 RSP: 0018:ffff8801868bf800 EFLAGS: 00010282 RAX: 000000000000006c RBX: ffffffff87d2fb00 RCX: 0000000000000000 RDX: 000000000000006c RSI: ffffffff81610731 RDI: ffffed0030d17ef6 RBP: ffff8801868bf858 R08: ffff88018daa4200 R09: ffffed003b5c4fb0 R10: ffffed003b5c4fb0 R11: ffff8801dae27d87 R12: ffffffff87d2f8e0 R13: ffffffff87d2f7a0 R14: ffffffff87d2f7a0 R15: ffffffff87d2f7a0 FS: 00007f56a14ac700(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2bc21000 CR3: 00000001abeb1000 CR4: 00000000001426f0 DR0: 0000000020000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000030602 Call Trace: check_bogus_address mm/usercopy.c:153 [inline] __check_object_size+0x5d9/0x5d9 mm/usercopy.c:256 check_object_size include/linux/thread_info.h:108 [inline] check_copy_size include/linux/thread_info.h:139 [inline] copy_from_iter_full include/linux/uio.h:121 [inline] memcpy_from_msg include/linux/skbuff.h:3305 [inline] llc_ui_sendmsg+0x4b1/0x1530 net/llc/af_llc.c:941 sock_sendmsg_nosec net/socket.c:629 [inline] sock_sendmsg+0xd5/0x120 net/socket.c:639 __sys_sendto+0x3d7/0x670 net/socket.c:1789 __do_sys_sendto net/socket.c:1801 [inline] __se_sys_sendto net/socket.c:1797 [inline] __x64_sys_sendto+0xe1/0x1a0 net/socket.c:1797 do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x455979 RSP: 002b:00007f56a14abc68 EFLAGS: 00000246 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 00007f56a14ac6d4 RCX: 0000000000455979 RDX: 0000000000000000 RSI: 0000000020000000 RDI: 0000000000000018 RBP: 000000000072bea0 R08: 00000000200012c0 R09: 0000000000000010 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000548 R14: 00000000006fbf60 R15: 0000000000000000 Code: 55 c0 e8 c0 55 bb ff ff 75 c8 48 8b 55 c0 4d 89 f9 ff 75 d0 4d 89 e8 48 89 d9 4c 89 e6 41 56 48 c7 c7 80 fa d2 87 e8 a0 0b a3 ff <0f> 0b e8 95 55 bb ff e8 c0 a8 f7 ff 8b 95 14 ff ff ff 4d 89 e8 RIP: usercopy_abort+0xbb/0xbd mm/usercopy.c:88 RSP: ffff8801868bf800 Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2") Signed-off-by: Eric Dumazet <edumazet@google.com> Reported-by: syzbot <syzkaller@googlegroups.com> Signed-off-by: David S. Miller <davem@davemloft.net>

Connections in One-packet scheduling mode (-o, --ops) are removed with refcnt=0 because they are not hashed in conn table. To avoid refcount_dec reporting this as error, change them to be removed with refcount_dec_if_one as all other connections. refcount_t hit zero at ip_vs_conn_put+0x31/0x40 [ip_vs] in sh[15519], uid/euid: 497/497 WARNING: CPU: 0 PID: 15519 at ../kernel/panic.c:657 refcount_error_report+0x94/0x9e Modules linked in: ip_vs_rr cirrus ttm sb_edac edac_core drm_kms_helper crct10dif_pclmul crc32_pclmul ghash_clmulni_intel pcbc mousedev drm aesni_intel aes_x86_64 crypto_simd glue_helper cryptd psmouse evdev input_leds led_class intel_agp fb_sys_fops syscopyarea sysfillrect intel_rapl_perf mac_hid intel_gtt serio_raw sysimgblt agpgart i2c_piix4 i2c_core ata_generic pata_acpi floppy cfg80211 rfkill button loop macvlan ip_vs nf_conntrack libcrc32c crc32c_generic ip_tables x_tables ipv6 crc_ccitt autofs4 ext4 crc16 mbcache jbd2 fscrypto ata_piix libata atkbd libps2 scsi_mod crc32c_intel i8042 rtc_cmos serio af_packet dm_mod dax fuse xen_netfront xen_blkfront CPU: 0 PID: 15519 Comm: sh Tainted: G W 4.15.17 Ps3itaTeam#1-NixOS Hardware name: Xen HVM domU, BIOS 4.2.amazon 08/24/2006 RIP: 0010:refcount_error_report+0x94/0x9e RSP: 0000:ffffa344dde039c8 EFLAGS: 00010296 RAX: 0000000000000057 RBX: ffffffff92f20e06 RCX: 0000000000000006 RDX: 0000000000000007 RSI: 0000000000000086 RDI: ffffa344dde165c0 RBP: ffffa344dde03b08 R08: 0000000000000218 R09: 0000000000000004 R10: ffffffff93006a80 R11: 0000000000000001 R12: ffffa344d68cd100 R13: 00000000000001f1 R14: ffffffff92f12fb0 R15: 0000000000000004 FS: 00007fc9d2040fc0(0000) GS:ffffa344dde00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000000262a000 CR3: 0000000016a0c004 CR4: 00000000001606f0 Call Trace: <IRQ> ex_handler_refcount+0x4e/0x80 fixup_exception+0x33/0x40 do_trap+0x83/0x140 do_error_trap+0x83/0xf0 ? ip_vs_conn_drop_conntrack+0x120/0x1a5 [ip_vs] ? ip_finish_output2+0x29c/0x390 ? ip_finish_output2+0x1a2/0x390 invalid_op+0x1b/0x40 RIP: 0010:ip_vs_conn_put+0x31/0x40 [ip_vs] RSP: 0000:ffffa344dde03bb8 EFLAGS: 00010246 RAX: 0000000000000001 RBX: ffffa344df31cf00 RCX: ffffa344d7450198 RDX: 0000000000000003 RSI: 00000000fffffe01 RDI: ffffa344d7450140 RBP: 0000000000000002 R08: 0000000000000476 R09: 0000000000000000 R10: ffffa344dde03b28 R11: ffffa344df200000 R12: ffffa344d7d09000 R13: ffffa344def3a980 R14: ffffffffc04f6e20 R15: 0000000000000008 ip_vs_in.part.29.constprop.36+0x34f/0x640 [ip_vs] ? ip_vs_conn_out_get+0xe0/0xe0 [ip_vs] ip_vs_remote_request4+0x47/0xa0 [ip_vs] ? ip_vs_in.part.29.constprop.36+0x640/0x640 [ip_vs] nf_hook_slow+0x43/0xc0 ip_local_deliver+0xac/0xc0 ? ip_rcv_finish+0x400/0x400 ip_rcv+0x26c/0x380 __netif_receive_skb_core+0x3a0/0xb10 ? inet_gro_receive+0x23c/0x2b0 ? netif_receive_skb_internal+0x24/0xb0 netif_receive_skb_internal+0x24/0xb0 napi_gro_receive+0xb8/0xe0 xennet_poll+0x676/0xb40 [xen_netfront] net_rx_action+0x139/0x3a0 __do_softirq+0xde/0x2b4 irq_exit+0xae/0xb0 xen_evtchn_do_upcall+0x2c/0x40 xen_hvm_callback_vector+0x7d/0x90 </IRQ> RIP: 0033:0x7fc9d11c91f9 RSP: 002b:00007ffebe8a2ea0 EFLAGS: 00000202 ORIG_RAX: ffffffffffffff0c RAX: 00000000ffffffff RBX: 0000000002609808 RCX: 0000000000000054 RDX: 0000000000000001 RSI: 0000000002605440 RDI: 00000000025f940e RBP: 00000000025f940e R08: 000000000260213d R09: 1999999999999999 R10: 000000000262a808 R11: 00000000025f942d R12: 00000000025f940e R13: 00007fc9d1301e20 R14: 00000000025f9408 R15: 00007fc9d1302720 Code: 48 8b 95 80 00 00 00 41 55 49 8d 8c 24 e0 05 00 00 45 8b 84 24 38 04 00 00 41 89 c1 48 89 de 48 c7 c7 a8 2f f2 92 e8 7c fa ff ff <0f> 0b 58 5b 5d 41 5c 41 5d c3 0f 1f 44 00 00 55 48 89 e5 41 56 Reported-by: Net Filter <netfilternetfilter@gmail.com> Fixes: b54ab92 ("netfilter: refcounter conversions") Signed-off-by: Julian Anastasov <ja@ssi.bg> Acked-by: Simon Horman <horms@verge.net.au> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

The current code sets an affinity hint with a cpumask_t stored on the stack. This value can then be accessed through /proc/irq/*/affinity_hint/, causing a segfault or returning corrupt data. Move the cpumask_t into struct i40iw_msix_vector so it is available later. Backtrace: BUG: unable to handle kernel paging request at ffffb16e600e7c90 IP: irq_affinity_hint_proc_show+0x60/0xf0 PGD 17c0c6d067 PUD 17c0c6e067 PMD 15d4a0e067 PTE 0 Oops: 0000 [Ps3itaTeam#1] SMP Modules linked in: ... CPU: 3 PID: 172543 Comm: grep Tainted: G OE ... Ps3itaTeam#1 Hardware name: ... task: ffff9a5caee08000 task.stack: ffffb16e659d8000 RIP: 0010:irq_affinity_hint_proc_show+0x60/0xf0 RSP: 0018:ffffb16e659dbd20 EFLAGS: 00010086 RAX: 0000000000000246 RBX: ffffb16e659dbd20 RCX: 0000000000000000 RDX: ffffb16e600e7c90 RSI: 0000000000000003 RDI: 0000000000000046 RBP: ffffb16e659dbd88 R08: 0000000000000038 R09: 0000000000000001 R10: 0000000070803079 R11: 0000000000000000 R12: ffff9a59d1d97a00 R13: ffff9a5da47a6cd8 R14: ffff9a5da47a6c00 R15: ffff9a59d1d97a00 FS: 00007f946c31d740(0000) GS:ffff9a5dc1800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffb16e600e7c90 CR3: 00000016a4339000 CR4: 00000000007406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 PKRU: 55555554 Call Trace: seq_read+0x12d/0x430 ? sched_clock_cpu+0x11/0xb0 proc_reg_read+0x48/0x70 __vfs_read+0x37/0x140 ? security_file_permission+0xa0/0xc0 vfs_read+0x96/0x140 SyS_read+0x58/0xc0 do_syscall_64+0x5a/0x190 entry_SYSCALL64_slow_path+0x25/0x25 RIP: 0033:0x7f946bbc97e0 RSP: 002b:00007ffdd0c4ae08 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 RAX: ffffffffffffffda RBX: 000000000096b000 RCX: 00007f946bbc97e0 RDX: 000000000096b000 RSI: 00007f946a2f0000 RDI: 0000000000000004 RBP: 0000000000001000 R08: 00007f946a2ef011 R09: 000000000000000a R10: 0000000000001000 R11: 0000000000000246 R12: 00007f946a2f0000 R13: 0000000000000004 R14: 0000000000000000 R15: 00007f946a2f0000 Code: b9 08 00 00 00 49 89 c6 48 89 df 31 c0 4d 8d ae d8 00 00 00 f3 48 ab 4c 89 ef e8 6c 9a 56 00 49 8b 96 30 01 00 00 48 85 d2 74 3f <48> 8b 0a 48 89 4d 98 48 8b 4a 08 48 89 4d a0 48 8b 4a 10 48 89 RIP: irq_affinity_hint_proc_show+0x60/0xf0 RSP: ffffb16e659dbd20 CR2: ffffb16e600e7c90 Fixes: 8e06af7 ("i40iw: add main, hdr, status") Signed-off-by: Andrew Boyer <andrew.boyer@dell.com> Reviewed-by: Shiraz Saleem <shiraz.saleem@intel.com> Signed-off-by: Doug Ledford <dledford@redhat.com>

Currently; we're grabbing all of the modesetting locks before adding MST connectors to fbdev. This isn't actually necessary, and causes a deadlock as well: ====================================================== WARNING: possible circular locking dependency detected 4.17.0-rc3Lyude-Test+ Ps3itaTeam#1 Tainted: G O ------------------------------------------------------ kworker/1:0/18 is trying to acquire lock: 00000000c832f62d (&helper->lock){+.+.}, at: drm_fb_helper_add_one_connector+0x2a/0x60 [drm_kms_helper] but task is already holding lock: 00000000942e28e2 (crtc_ww_class_mutex){+.+.}, at: drm_modeset_backoff+0x8e/0x1c0 [drm] which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> Ps3itaTeam#3 (crtc_ww_class_mutex){+.+.}: ww_mutex_lock+0x43/0x80 drm_modeset_lock+0x71/0x130 [drm] drm_helper_probe_single_connector_modes+0x7d/0x6b0 [drm_kms_helper] drm_setup_crtcs+0x15e/0xc90 [drm_kms_helper] __drm_fb_helper_initial_config_and_unlock+0x29/0x480 [drm_kms_helper] nouveau_fbcon_init+0x138/0x1a0 [nouveau] nouveau_drm_load+0x173/0x7e0 [nouveau] drm_dev_register+0x134/0x1c0 [drm] drm_get_pci_dev+0x8e/0x160 [drm] nouveau_drm_probe+0x1a9/0x230 [nouveau] pci_device_probe+0xcd/0x150 driver_probe_device+0x30b/0x480 __driver_attach+0xbc/0xe0 bus_for_each_dev+0x67/0x90 bus_add_driver+0x164/0x260 driver_register+0x57/0xc0 do_one_initcall+0x4d/0x323 do_init_module+0x5b/0x1f8 load_module+0x20e5/0x2ac0 __do_sys_finit_module+0xb7/0xd0 do_syscall_64+0x60/0x1b0 entry_SYSCALL_64_after_hwframe+0x49/0xbe -> Ps3itaTeam#2 (crtc_ww_class_acquire){+.+.}: drm_helper_probe_single_connector_modes+0x58/0x6b0 [drm_kms_helper] drm_setup_crtcs+0x15e/0xc90 [drm_kms_helper] __drm_fb_helper_initial_config_and_unlock+0x29/0x480 [drm_kms_helper] nouveau_fbcon_init+0x138/0x1a0 [nouveau] nouveau_drm_load+0x173/0x7e0 [nouveau] drm_dev_register+0x134/0x1c0 [drm] drm_get_pci_dev+0x8e/0x160 [drm] nouveau_drm_probe+0x1a9/0x230 [nouveau] pci_device_probe+0xcd/0x150 driver_probe_device+0x30b/0x480 __driver_attach+0xbc/0xe0 bus_for_each_dev+0x67/0x90 bus_add_driver+0x164/0x260 driver_register+0x57/0xc0 do_one_initcall+0x4d/0x323 do_init_module+0x5b/0x1f8 load_module+0x20e5/0x2ac0 __do_sys_finit_module+0xb7/0xd0 do_syscall_64+0x60/0x1b0 entry_SYSCALL_64_after_hwframe+0x49/0xbe -> Ps3itaTeam#1 (&dev->mode_config.mutex){+.+.}: drm_setup_crtcs+0x10c/0xc90 [drm_kms_helper] __drm_fb_helper_initial_config_and_unlock+0x29/0x480 [drm_kms_helper] nouveau_fbcon_init+0x138/0x1a0 [nouveau] nouveau_drm_load+0x173/0x7e0 [nouveau] drm_dev_register+0x134/0x1c0 [drm] drm_get_pci_dev+0x8e/0x160 [drm] nouveau_drm_probe+0x1a9/0x230 [nouveau] pci_device_probe+0xcd/0x150 driver_probe_device+0x30b/0x480 __driver_attach+0xbc/0xe0 bus_for_each_dev+0x67/0x90 bus_add_driver+0x164/0x260 driver_register+0x57/0xc0 do_one_initcall+0x4d/0x323 do_init_module+0x5b/0x1f8 load_module+0x20e5/0x2ac0 __do_sys_finit_module+0xb7/0xd0 do_syscall_64+0x60/0x1b0 entry_SYSCALL_64_after_hwframe+0x49/0xbe -> #0 (&helper->lock){+.+.}: __mutex_lock+0x70/0x9d0 drm_fb_helper_add_one_connector+0x2a/0x60 [drm_kms_helper] nv50_mstm_register_connector+0x2c/0x50 [nouveau] drm_dp_add_port+0x2f5/0x420 [drm_kms_helper] drm_dp_send_link_address+0x155/0x1e0 [drm_kms_helper] drm_dp_add_port+0x33f/0x420 [drm_kms_helper] drm_dp_send_link_address+0x155/0x1e0 [drm_kms_helper] drm_dp_check_and_send_link_address+0x87/0xd0 [drm_kms_helper] drm_dp_mst_link_probe_work+0x4d/0x80 [drm_kms_helper] process_one_work+0x20d/0x650 worker_thread+0x3a/0x390 kthread+0x11e/0x140 ret_from_fork+0x3a/0x50 other info that might help us debug this: Chain exists of: &helper->lock --> crtc_ww_class_acquire --> crtc_ww_class_mutex Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(crtc_ww_class_mutex); lock(crtc_ww_class_acquire); lock(crtc_ww_class_mutex); lock(&helper->lock); *** DEADLOCK *** 5 locks held by kworker/1:0/18: #0: 000000004a05cd50 ((wq_completion)"events_long"){+.+.}, at: process_one_work+0x187/0x650 Ps3itaTeam#1: 00000000601c11d1 ((work_completion)(&mgr->work)){+.+.}, at: process_one_work+0x187/0x650 Ps3itaTeam#2: 00000000586ca0df (&dev->mode_config.mutex){+.+.}, at: drm_modeset_lock_all+0x3a/0x1b0 [drm] Ps3itaTeam#3: 00000000d3ca0ffa (crtc_ww_class_acquire){+.+.}, at: drm_modeset_lock_all+0x44/0x1b0 [drm] fail0verflow#4: 00000000942e28e2 (crtc_ww_class_mutex){+.+.}, at: drm_modeset_backoff+0x8e/0x1c0 [drm] stack backtrace: CPU: 1 PID: 18 Comm: kworker/1:0 Tainted: G O 4.17.0-rc3Lyude-Test+ Ps3itaTeam#1 Hardware name: Gateway FX6840/FX6840, BIOS P01-A3 05/17/2010 Workqueue: events_long drm_dp_mst_link_probe_work [drm_kms_helper] Call Trace: dump_stack+0x85/0xcb print_circular_bug.isra.38+0x1ce/0x1db __lock_acquire+0x128f/0x1350 ? lock_acquire+0x9f/0x200 ? lock_acquire+0x9f/0x200 ? __ww_mutex_lock.constprop.13+0x8f/0x1000 lock_acquire+0x9f/0x200 ? drm_fb_helper_add_one_connector+0x2a/0x60 [drm_kms_helper] ? drm_fb_helper_add_one_connector+0x2a/0x60 [drm_kms_helper] __mutex_lock+0x70/0x9d0 ? drm_fb_helper_add_one_connector+0x2a/0x60 [drm_kms_helper] ? ww_mutex_lock+0x43/0x80 ? _cond_resched+0x15/0x30 ? ww_mutex_lock+0x43/0x80 ? drm_modeset_lock+0xb2/0x130 [drm] ? drm_fb_helper_add_one_connector+0x2a/0x60 [drm_kms_helper] drm_fb_helper_add_one_connector+0x2a/0x60 [drm_kms_helper] nv50_mstm_register_connector+0x2c/0x50 [nouveau] drm_dp_add_port+0x2f5/0x420 [drm_kms_helper] ? mark_held_locks+0x50/0x80 ? kfree+0xcf/0x2a0 ? drm_dp_check_mstb_guid+0xd6/0x120 [drm_kms_helper] ? trace_hardirqs_on_caller+0xed/0x180 ? drm_dp_check_mstb_guid+0xd6/0x120 [drm_kms_helper] drm_dp_send_link_address+0x155/0x1e0 [drm_kms_helper] drm_dp_add_port+0x33f/0x420 [drm_kms_helper] ? nouveau_connector_aux_xfer+0x7c/0xb0 [nouveau] ? find_held_lock+0x2d/0x90 ? drm_dp_dpcd_access+0xd9/0xf0 [drm_kms_helper] ? __mutex_unlock_slowpath+0x3b/0x280 ? drm_dp_dpcd_access+0xd9/0xf0 [drm_kms_helper] drm_dp_send_link_address+0x155/0x1e0 [drm_kms_helper] drm_dp_check_and_send_link_address+0x87/0xd0 [drm_kms_helper] drm_dp_mst_link_probe_work+0x4d/0x80 [drm_kms_helper] process_one_work+0x20d/0x650 worker_thread+0x3a/0x390 ? process_one_work+0x650/0x650 kthread+0x11e/0x140 ? kthread_create_worker_on_cpu+0x50/0x50 ret_from_fork+0x3a/0x50 Taking example from i915, the only time we need to hold any modesetting locks is when changing the port on the mstc, and in that case we only need to hold the connection mutex. Signed-off-by: Lyude Paul <lyude@redhat.com> Cc: Karol Herbst <kherbst@redhat.com> Cc: stable@vger.kernel.org Signed-off-by: Lyude Paul <lyude@redhat.com> Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

… missing When application fails to pass flags in netlink TLV for a new skbedit action, the kernel results in the following oops: [ 8.307732] BUG: unable to handle kernel paging request at 0000000000021130 [ 8.309167] PGD 80000000193d1067 P4D 80000000193d1067 PUD 180e0067 PMD 0 [ 8.310595] Oops: 0000 [Ps3itaTeam#1] SMP PTI [ 8.311334] Modules linked in: kvm_intel kvm irqbypass crct10dif_pclmul crc32_pclmul ghash_clmulni_intel pcbc aesni_intel aes_x86_64 crypto_simd cryptd glue_helper serio_raw [ 8.314190] CPU: 1 PID: 397 Comm: tc Not tainted 4.17.0-rc3+ torvalds#357 [ 8.315252] RIP: 0010:__tcf_idr_release+0x33/0x140 [ 8.316203] RSP: 0018:ffffa0718038f840 EFLAGS: 00010246 [ 8.317123] RAX: 0000000000000001 RBX: 0000000000021100 RCX: 0000000000000000 [ 8.319831] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000021100 [ 8.321181] RBP: 0000000000000000 R08: 000000000004adf8 R09: 0000000000000122 [ 8.322645] R10: 0000000000000000 R11: ffffffff9e5b01ed R12: 0000000000000000 [ 8.324157] R13: ffffffff9e0d3cc0 R14: 0000000000000000 R15: 0000000000000000 [ 8.325590] FS: 00007f591292e700(0000) GS:ffff8fcf5bc40000(0000) knlGS:0000000000000000 [ 8.327001] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 8.327987] CR2: 0000000000021130 CR3: 00000000180e6004 CR4: 00000000001606a0 [ 8.329289] Call Trace: [ 8.329735] tcf_skbedit_init+0xa7/0xb0 [ 8.330423] tcf_action_init_1+0x362/0x410 [ 8.331139] ? try_to_wake_up+0x44/0x430 [ 8.331817] tcf_action_init+0x103/0x190 [ 8.332511] tc_ctl_action+0x11a/0x220 [ 8.333174] rtnetlink_rcv_msg+0x23d/0x2e0 [ 8.333902] ? _cond_resched+0x16/0x40 [ 8.334569] ? __kmalloc_node_track_caller+0x5b/0x2c0 [ 8.335440] ? rtnl_calcit.isra.31+0xf0/0xf0 [ 8.336178] netlink_rcv_skb+0xdb/0x110 [ 8.336855] netlink_unicast+0x167/0x220 [ 8.337550] netlink_sendmsg+0x2a7/0x390 [ 8.338258] sock_sendmsg+0x30/0x40 [ 8.338865] ___sys_sendmsg+0x2c5/0x2e0 [ 8.339531] ? pagecache_get_page+0x27/0x210 [ 8.340271] ? filemap_fault+0xa2/0x630 [ 8.340943] ? page_add_file_rmap+0x108/0x200 [ 8.341732] ? alloc_set_pte+0x2aa/0x530 [ 8.342573] ? finish_fault+0x4e/0x70 [ 8.343332] ? __handle_mm_fault+0xbc1/0x10d0 [ 8.344337] ? __sys_sendmsg+0x53/0x80 [ 8.345040] __sys_sendmsg+0x53/0x80 [ 8.345678] do_syscall_64+0x4f/0x100 [ 8.346339] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 8.347206] RIP: 0033:0x7f591191da67 [ 8.347831] RSP: 002b:00007fff745abd48 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 8.349179] RAX: ffffffffffffffda RBX: 00007fff745abe70 RCX: 00007f591191da67 [ 8.350431] RDX: 0000000000000000 RSI: 00007fff745abdc0 RDI: 0000000000000003 [ 8.351659] RBP: 000000005af35251 R08: 0000000000000001 R09: 0000000000000000 [ 8.352922] R10: 00000000000005f1 R11: 0000000000000246 R12: 0000000000000000 [ 8.354183] R13: 00007fff745afed0 R14: 0000000000000001 R15: 00000000006767c0 [ 8.355400] Code: 41 89 d4 53 89 f5 48 89 fb e8 aa 20 fd ff 85 c0 0f 84 ed 00 00 00 48 85 db 0f 84 cf 00 00 00 40 84 ed 0f 85 cd 00 00 00 45 84 e4 <8b> 53 30 74 0d 85 d2 b8 ff ff ff ff 0f 8f b3 00 00 00 8b 43 2c [ 8.358699] RIP: __tcf_idr_release+0x33/0x140 RSP: ffffa0718038f840 [ 8.359770] CR2: 0000000000021130 [ 8.360438] ---[ end trace 60c66be45dfc14f0 ]--- The caller calls action's ->init() and passes pointer to "struct tc_action *a", which later may be initialized to point at the existing action, otherwise "struct tc_action *a" is still invalid, and therefore dereferencing it is an error as happens in tcf_idr_release, where refcnt is decremented. So in case of missing flags tcf_idr_release must be called only for existing actions. v2: - prepare patch for net tree Fixes: 5e1567a ("net sched: skbedit action fix late binding") Signed-off-by: Roman Mashak <mrv@mojatatu.com> Acked-by: Cong Wang <xiyou.wangcong@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>

…pshotting [BUG] btrfs incremental send BUG happens when creating a snapshot of snapshot that is being used by send. [REASON] The problem can happen if while we are doing a send one of the snapshots used (parent or send) is snapshotted, because snapshoting implies COWing the root of the source subvolume/snapshot. 1. When doing an incremental send, the send process will get the commit roots from the parent and send snapshots, and add references to them through extent_buffer_get(). 2. When a snapshot/subvolume is snapshotted, its root node is COWed (transaction.c:create_pending_snapshot()). 3. COWing releases the space used by the node immediately, through: __btrfs_cow_block() --btrfs_free_tree_block() ----btrfs_add_free_space(bytenr of node) 4. Because send doesn't hold a transaction open, it's possible that the transaction used to create the snapshot commits, switches the commit root and the old space used by the previous root node gets assigned to some other node allocation. Allocation of a new node will use the existing extent buffer found in memory, which we previously got a reference through extent_buffer_get(), and allow the extent buffer's content (pages) to be modified: btrfs_alloc_tree_block --btrfs_reserve_extent ----find_free_extent (get bytenr of old node) --btrfs_init_new_buffer (use bytenr of old node) ----btrfs_find_create_tree_block ------alloc_extent_buffer --------find_extent_buffer (get old node) 5. So send can access invalid memory content and have unpredictable behaviour. [FIX] So we fix the problem by copying the commit roots of the send and parent snapshots and use those copies. CallTrace looks like this: ------------[ cut here ]------------ kernel BUG at fs/btrfs/ctree.c:1861! invalid opcode: 0000 [Ps3itaTeam#1] SMP CPU: 6 PID: 24235 Comm: btrfs Tainted: P O 3.10.105 #23721 ffff88046652d680 ti: ffff88041b720000 task.ti: ffff88041b720000 RIP: 0010:[<ffffffffa08dd0e8>] read_node_slot+0x108/0x110 [btrfs] RSP: 0018:ffff88041b723b68 EFLAGS: 00010246 RAX: ffff88043ca6b000 RBX: ffff88041b723c50 RCX: ffff880000000000 RDX: 000000000000004c RSI: ffff880314b133f8 RDI: ffff880458b24000 RBP: 0000000000000000 R08: 0000000000000001 R09: ffff88041b723c66 R10: 0000000000000001 R11: 0000000000001000 R12: ffff8803f3e48890 R13: ffff8803f3e48880 R14: ffff880466351800 R15: 0000000000000001 FS: 00007f8c321dc8c0(0000) GS:ffff88047fcc0000(0000) CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 R2: 00007efd1006d000 CR3: 0000000213a24000 CR4: 00000000003407e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Stack: ffff88041b723c50 ffff8803f3e48880 ffff8803f3e48890 ffff8803f3e48880 ffff880466351800 0000000000000001 ffffffffa08dd9d7 ffff88041b723c50 ffff8803f3e48880 ffff88041b723c66 ffffffffa08dde85 a9ff88042d2c4400 Call Trace: [<ffffffffa08dd9d7>] ? tree_move_down.isra.33+0x27/0x50 [btrfs] [<ffffffffa08dde85>] ? tree_advance+0xb5/0xc0 [btrfs] [<ffffffffa08e83d4>] ? btrfs_compare_trees+0x2d4/0x760 [btrfs] [<ffffffffa0982050>] ? finish_inode_if_needed+0x870/0x870 [btrfs] [<ffffffffa09841ea>] ? btrfs_ioctl_send+0xeda/0x1050 [btrfs] [<ffffffffa094bd3d>] ? btrfs_ioctl+0x1e3d/0x33f0 [btrfs] [<ffffffff81111133>] ? handle_pte_fault+0x373/0x990 [<ffffffff8153a096>] ? atomic_notifier_call_chain+0x16/0x20 [<ffffffff81063256>] ? set_task_cpu+0xb6/0x1d0 [<ffffffff811122c3>] ? handle_mm_fault+0x143/0x2a0 [<ffffffff81539cc0>] ? __do_page_fault+0x1d0/0x500 [<ffffffff81062f07>] ? check_preempt_curr+0x57/0x90 [<ffffffff8115075a>] ? do_vfs_ioctl+0x4aa/0x990 [<ffffffff81034f83>] ? do_fork+0x113/0x3b0 [<ffffffff812dd7d7>] ? trace_hardirqs_off_thunk+0x3a/0x6c [<ffffffff81150cc8>] ? SyS_ioctl+0x88/0xa0 [<ffffffff8153e422>] ? system_call_fastpath+0x16/0x1b ---[ end trace 29576629ee80b2e1 ]--- Fixes: 7069830 ("Btrfs: add btrfs_compare_trees function") CC: stable@vger.kernel.org # 3.6+ Signed-off-by: Robbie Ko <robbieko@synology.com> Reviewed-by: Filipe Manana <fdmanana@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>

platform_domain_notifier contains a variable sized array, which the pm_clk_notify() notifier treats as a NULL terminated array: for (con_id = clknb->con_ids; *con_id; con_id++) pm_clk_add(dev, *con_id); Omitting the initialiser for con_ids means that the array is zero sized, and there is no NULL terminator. This leads to pm_clk_notify() overrunning into what ever structure follows, which may not be NULL. This leads to an oops: Unable to handle kernel NULL pointer dereference at virtual address 0000008c pgd = c0003000 [0000008c] *pgd=80000800004003c, *pmd=00000000c Internal error: Oops: 206 [Ps3itaTeam#1] PREEMPT SMP ARM Modules linked in:c CPU: 0 PID: 1 Comm: swapper/0 Not tainted 4.16.0+ torvalds#9 Hardware name: Keystone PC is at strlen+0x0/0x34 LR is at kstrdup+0x18/0x54 pc : [<c0623340>] lr : [<c0111d6c>] psr: 20000013 sp : eec73dc ip : eed780c0 fp : 00000001 r10: 00000000 r9 : 00000000 r8 : eed71e10 r7 : 0000008c r6 : 0000008c r5 : 014000c0 r4 : c03a6ff4 r3 : c09445d0 r2 : 00000000 r1 : 014000c0 r0 : 0000008c Flags: nzCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 00003000 DAC: fffffff Process swapper/0 (pid: 1, stack limit = 0xeec72210) Stack: (0xeec73dc0 to 0xeec74000) ... [<c0623340>] (strlen) from [<c0111d6c>] (kstrdup+0x18/0x54) [<c0111d6c>] (kstrdup) from [<c03a6ff4>] (__pm_clk_add+0x58/0x120) [<c03a6ff4>] (__pm_clk_add) from [<c03a731c>] (pm_clk_notify+0x64/0xa8) [<c03a731c>] (pm_clk_notify) from [<c004614c>] (notifier_call_chain+0x44/0x84) [<c004614c>] (notifier_call_chain) from [<c0046320>] (__blocking_notifier_call_chain+0x48/0x60) [<c0046320>] (__blocking_notifier_call_chain) from [<c0046350>] (blocking_notifier_call_chain+0x18/0x20) [<c0046350>] (blocking_notifier_call_chain) from [<c0390234>] (device_add+0x36c/0x534) [<c0390234>] (device_add) from [<c047fc00>] (of_platform_device_create_pdata+0x70/0xa4) [<c047fc00>] (of_platform_device_create_pdata) from [<c047fea0>] (of_platform_bus_create+0xf0/0x1ec) [<c047fea0>] (of_platform_bus_create) from [<c047fff8>] (of_platform_populate+0x5c/0xac) [<c047fff8>] (of_platform_populate) from [<c08b1f04>] (of_platform_default_populate_init+0x8c/0xa8) [<c08b1f04>] (of_platform_default_populate_init) from [<c000a78c>] (do_one_initcall+0x3c/0x164) [<c000a78c>] (do_one_initcall) from [<c087bd9c>] (kernel_init_freeable+0x10c/0x1d0) [<c087bd9c>] (kernel_init_freeable) from [<c0628db0>] (kernel_init+0x8/0xf0) [<c0628db0>] (kernel_init) from [<c00090d8>] (ret_from_fork+0x14/0x3c) Exception stack(0xeec73fb0 to 0xeec73ff8) 3fa0: 00000000 00000000 00000000 00000000 3fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 3fe0: 00000000 00000000 00000000 00000000 00000013 00000000 Code: e3520000 1afffff7 e12fff1e c0801730 (e5d02000) ---[ end trace cafa8f148e262e80 ]--- Fix this by adding the necessary initialiser. Fixes: fc20ffe ("ARM: keystone: add PM domain support for clock management") Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk> Acked-by: Santosh Shilimkar <ssantosh@kernel.org> Signed-off-by: Olof Johansson <olof@lixom.net>

syzkaller found a reliable way to crash the host, hitting a BUG() in __tcp_retransmit_skb() Malicous MSG_FASTOPEN is the root cause. We need to purge write queue in tcp_connect_init() at the point we init snd_una/write_seq. This patch also replaces the BUG() by a less intrusive WARN_ON_ONCE() kernel BUG at net/ipv4/tcp_output.c:2837! invalid opcode: 0000 [Ps3itaTeam#1] SMP KASAN Dumping ftrace buffer: (ftrace buffer empty) Modules linked in: CPU: 0 PID: 5276 Comm: syz-executor0 Not tainted 4.17.0-rc3+ torvalds#51 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__tcp_retransmit_skb+0x2992/0x2eb0 net/ipv4/tcp_output.c:2837 RSP: 0000:ffff8801dae06ff8 EFLAGS: 00010206 RAX: ffff8801b9fe61c0 RBX: 00000000ffc18a16 RCX: ffffffff864e1a49 RDX: 0000000000000100 RSI: ffffffff864e2e12 RDI: 0000000000000005 RBP: ffff8801dae073a0 R08: ffff8801b9fe61c0 R09: ffffed0039c40dd2 R10: ffffed0039c40dd2 R11: ffff8801ce206e93 R12: 00000000421eeaad R13: ffff8801ce206d4e R14: ffff8801ce206cc0 R15: ffff8801cd4f4a80 FS: 0000000000000000(0000) GS:ffff8801dae00000(0063) knlGS:00000000096bc900 CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 CR2: 0000000020000000 CR3: 00000001c47b6000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <IRQ> tcp_retransmit_skb+0x2e/0x250 net/ipv4/tcp_output.c:2923 tcp_retransmit_timer+0xc50/0x3060 net/ipv4/tcp_timer.c:488 tcp_write_timer_handler+0x339/0x960 net/ipv4/tcp_timer.c:573 tcp_write_timer+0x111/0x1d0 net/ipv4/tcp_timer.c:593 call_timer_fn+0x230/0x940 kernel/time/timer.c:1326 expire_timers kernel/time/timer.c:1363 [inline] __run_timers+0x79e/0xc50 kernel/time/timer.c:1666 run_timer_softirq+0x4c/0x70 kernel/time/timer.c:1692 __do_softirq+0x2e0/0xaf5 kernel/softirq.c:285 invoke_softirq kernel/softirq.c:365 [inline] irq_exit+0x1d1/0x200 kernel/softirq.c:405 exiting_irq arch/x86/include/asm/apic.h:525 [inline] smp_apic_timer_interrupt+0x17e/0x710 arch/x86/kernel/apic/apic.c:1052 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:863 Fixes: cf60af0 ("net-tcp: Fast Open client - sendmsg(MSG_FASTOPEN)") Signed-off-by: Eric Dumazet <edumazet@google.com> Cc: Yuchung Cheng <ycheng@google.com> Cc: Neal Cardwell <ncardwell@google.com> Reported-by: syzbot <syzkaller@googlegroups.com> Acked-by: Neal Cardwell <ncardwell@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>

Doing faccessat("/afs/some/directory", 0) triggers a BUG in the permissions check code. Fix this by just removing the BUG section. If no permissions are asked for, just return okay if the file exists. Also: (1) Split up the directory check so that it has separate if-statements rather than if-else-if (e.g. checking for MAY_EXEC shouldn't skip the check for MAY_READ and MAY_WRITE). (2) Check for MAY_CHDIR as MAY_EXEC. Without the main fix, the following BUG may occur: kernel BUG at fs/afs/security.c:386! invalid opcode: 0000 [Ps3itaTeam#1] SMP PTI ... RIP: 0010:afs_permission+0x19d/0x1a0 [kafs] ... Call Trace: ? inode_permission+0xbe/0x180 ? do_faccessat+0xdc/0x270 ? do_syscall_64+0x60/0x1f0 ? entry_SYSCALL_64_after_hwframe+0x49/0xbe Fixes: 00d3b7a ("[AFS]: Add security support.") Reported-by: Jonathan Billings <jsbillings@jsbillings.org> Signed-off-by: David Howells <dhowells@redhat.com>

…bj_dump() In the nft_ct_helper_obj_dump(), always priv->helper4 is dereferenced. But if family is ipv6, priv->helper6 should be dereferenced. Steps to reproduces: #test.nft table ip6 filter { ct helper ftp { type "ftp" protocol tcp } chain input { type filter hook input priority 4; ct helper set "ftp" } } %nft -f test.nft %nft list ruleset we can see the below messages: [ 916.286233] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 916.294777] general protection fault: 0000 [Ps3itaTeam#1] SMP DEBUG_PAGEALLOC KASAN PTI [ 916.302613] Modules linked in: nft_objref nf_conntrack_sip nf_conntrack_snmp nf_conntrack_broadcast nf_conntrack_ftp nft_ct nf_conntrack nf_tables nfnetlink [last unloaded: nfnetlink] [ 916.318758] CPU: 1 PID: 2093 Comm: nft Not tainted 4.17.0-rc4+ torvalds#181 [ 916.326772] Hardware name: To be filled by O.E.M. To be filled by O.E.M./Aptio CRB, BIOS 5.6.5 07/08/2015 [ 916.338773] RIP: 0010:strlen+0x1a/0x90 [ 916.342781] RSP: 0018:ffff88010ff0f2f8 EFLAGS: 00010292 [ 916.346773] RAX: dffffc0000000000 RBX: ffff880119b26ee8 RCX: ffff88010c150038 [ 916.354777] RDX: 0000000000000002 RSI: ffff880119b26ee8 RDI: 0000000000000010 [ 916.362773] RBP: 0000000000000010 R08: 0000000000007e88 R09: ffff88010c15003c [ 916.370773] R10: ffff88010c150037 R11: ffffed002182a007 R12: ffff88010ff04040 [ 916.378779] R13: 0000000000000010 R14: ffff880119b26f30 R15: ffff88010ff04110 [ 916.387265] FS: 00007f57a1997700(0000) GS:ffff88011b800000(0000) knlGS:0000000000000000 [ 916.394785] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 916.402778] CR2: 00007f57a0ac80f0 CR3: 000000010ff02000 CR4: 00000000001006e0 [ 916.410772] Call Trace: [ 916.414787] nft_ct_helper_obj_dump+0x94/0x200 [nft_ct] [ 916.418779] ? nft_ct_set_eval+0x560/0x560 [nft_ct] [ 916.426771] ? memset+0x1f/0x40 [ 916.426771] ? __nla_reserve+0x92/0xb0 [ 916.434774] ? memcpy+0x34/0x50 [ 916.434774] nf_tables_fill_obj_info+0x484/0x860 [nf_tables] [ 916.442773] ? __nft_release_basechain+0x600/0x600 [nf_tables] [ 916.450779] ? lock_acquire+0x193/0x380 [ 916.454771] ? lock_acquire+0x193/0x380 [ 916.458789] ? nf_tables_dump_obj+0x148/0xcb0 [nf_tables] [ 916.462777] nf_tables_dump_obj+0x5f0/0xcb0 [nf_tables] [ 916.470769] ? __alloc_skb+0x30b/0x500 [ 916.474779] netlink_dump+0x752/0xb50 [ 916.478775] __netlink_dump_start+0x4d3/0x750 [ 916.482784] nf_tables_getobj+0x27a/0x930 [nf_tables] [ 916.490774] ? nft_obj_notify+0x100/0x100 [nf_tables] [ 916.494772] ? nf_tables_getobj+0x930/0x930 [nf_tables] [ 916.502579] ? nf_tables_dump_flowtable_done+0x70/0x70 [nf_tables] [ 916.506774] ? nft_obj_notify+0x100/0x100 [nf_tables] [ 916.514808] nfnetlink_rcv_msg+0x8ab/0xa86 [nfnetlink] [ 916.518771] ? nfnetlink_rcv_msg+0x550/0xa86 [nfnetlink] [ 916.526782] netlink_rcv_skb+0x23e/0x360 [ 916.530773] ? nfnetlink_bind+0x200/0x200 [nfnetlink] [ 916.534778] ? debug_check_no_locks_freed+0x280/0x280 [ 916.542770] ? netlink_ack+0x870/0x870 [ 916.546786] ? ns_capable_common+0xf4/0x130 [ 916.550765] nfnetlink_rcv+0x172/0x16c0 [nfnetlink] [ 916.554771] ? sched_clock_local+0xe2/0x150 [ 916.558774] ? sched_clock_cpu+0x144/0x180 [ 916.566575] ? lock_acquire+0x380/0x380 [ 916.570775] ? sched_clock_local+0xe2/0x150 [ 916.574765] ? nfnetlink_net_init+0x130/0x130 [nfnetlink] [ 916.578763] ? sched_clock_cpu+0x144/0x180 [ 916.582770] ? lock_acquire+0x193/0x380 [ 916.590771] ? lock_acquire+0x193/0x380 [ 916.594766] ? lock_acquire+0x380/0x380 [ 916.598760] ? netlink_deliver_tap+0x262/0xa60 [ 916.602766] ? lock_acquire+0x193/0x380 [ 916.606766] netlink_unicast+0x3ef/0x5a0 [ 916.610771] ? netlink_attachskb+0x630/0x630 [ 916.614763] netlink_sendmsg+0x72a/0xb00 [ 916.618769] ? netlink_unicast+0x5a0/0x5a0 [ 916.626766] ? _copy_from_user+0x92/0xc0 [ 916.630773] __sys_sendto+0x202/0x300 [ 916.634772] ? __ia32_sys_getpeername+0xb0/0xb0 [ 916.638759] ? lock_acquire+0x380/0x380 [ 916.642769] ? lock_acquire+0x193/0x380 [ 916.646761] ? finish_task_switch+0xf4/0x560 [ 916.650763] ? __schedule+0x582/0x19a0 [ 916.655301] ? __sched_text_start+0x8/0x8 [ 916.655301] ? up_read+0x1c/0x110 [ 916.655301] ? __do_page_fault+0x48b/0xaa0 [ 916.655301] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 916.655301] __x64_sys_sendto+0xdd/0x1b0 [ 916.655301] do_syscall_64+0x96/0x3d0 [ 916.655301] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 916.655301] RIP: 0033:0x7f57a0ff5e03 [ 916.655301] RSP: 002b:00007fff6367e0a8 EFLAGS: 00000246 ORIG_RAX: 000000000000002c [ 916.655301] RAX: ffffffffffffffda RBX: 00007fff6367f1e0 RCX: 00007f57a0ff5e03 [ 916.655301] RDX: 0000000000000020 RSI: 00007fff6367e110 RDI: 0000000000000003 [ 916.655301] RBP: 00007fff6367e100 R08: 00007f57a0ce9160 R09: 000000000000000c [ 916.655301] R10: 0000000000000000 R11: 0000000000000246 R12: 00007fff6367e110 [ 916.655301] R13: 0000000000000020 R14: 00007f57a153c610 R15: 0000562417258de0 [ 916.655301] Code: ff ff ff 0f 1f 40 00 66 2e 0f 1f 84 00 00 00 00 00 55 48 89 fa 53 48 c1 ea 03 48 b8 00 00 00 00 00 fc ff df 48 89 fd 48 83 ec 08 <0f> b6 04 02 48 89 fa 83 e2 07 38 d0 7f [ 916.655301] RIP: strlen+0x1a/0x90 RSP: ffff88010ff0f2f8 [ 916.771929] ---[ end trace 1065e048e72479fe ]--- [ 916.777204] Kernel panic - not syncing: Fatal exception [ 916.778158] Kernel Offset: 0x14000000 from 0xffffffff81000000 (relocation range: 0xffffffff80000000-0xffffffffbfffffff) Signed-off-by: Taehee Yoo <ap420073@gmail.com> Acked-by: Florian Westphal <fw@strlen.de> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

__gre6_xmit() pushes GRE headers before handing over to ip6_tnl_xmit() for generic IP-in-IP processing. However it doesn't make sure that there is enough headroom to push the header to. That can lead to the panic cited below. (Reproducer below that). Fix by requesting either needed_headroom if already primed, or just the bare minimum needed for the header otherwise. [ 158.576725] kernel BUG at net/core/skbuff.c:104! [ 158.581510] invalid opcode: 0000 [Ps3itaTeam#1] PREEMPT SMP KASAN PTI [ 158.587174] Modules linked in: act_mirred cls_matchall ip6_gre ip6_tunnel tunnel6 gre sch_ingress vrf veth x86_pkg_temp_thermal mlx_platform nfsd e1000e leds_mlxcpld [ 158.602268] CPU: 1 PID: 16 Comm: ksoftirqd/1 Not tainted 4.17.0-rc4-net_master-custom-139 torvalds#10 [ 158.610938] Hardware name: Mellanox Technologies Ltd. "MSN2410-CB2F"/"SA000874", BIOS 4.6.5 03/08/2016 [ 158.620426] RIP: 0010:skb_panic+0xc3/0x100 [ 158.624586] RSP: 0018:ffff8801d3f27110 EFLAGS: 00010286 [ 158.629882] RAX: 0000000000000082 RBX: ffff8801c02cc040 RCX: 0000000000000000 [ 158.637127] RDX: 0000000000000082 RSI: dffffc0000000000 RDI: ffffed003a7e4e18 [ 158.644366] RBP: ffff8801bfec8020 R08: ffffed003aabce19 R09: ffffed003aabce19 [ 158.651574] R10: 000000000000000b R11: ffffed003aabce18 R12: ffff8801c364de66 [ 158.658786] R13: 000000000000002c R14: 00000000000000c0 R15: ffff8801c364de68 [ 158.666007] FS: 0000000000000000(0000) GS:ffff8801d5400000(0000) knlGS:0000000000000000 [ 158.674212] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 158.680036] CR2: 00007f4b3702dcd0 CR3: 0000000003228002 CR4: 00000000001606e0 [ 158.687228] Call Trace: [ 158.689752] ? __gre6_xmit+0x246/0xd80 [ip6_gre] [ 158.694475] ? __gre6_xmit+0x246/0xd80 [ip6_gre] [ 158.699141] skb_push+0x78/0x90 [ 158.702344] __gre6_xmit+0x246/0xd80 [ip6_gre] [ 158.706872] ip6gre_tunnel_xmit+0x3bc/0x610 [ip6_gre] [ 158.711992] ? __gre6_xmit+0xd80/0xd80 [ip6_gre] [ 158.716668] ? debug_check_no_locks_freed+0x210/0x210 [ 158.721761] ? print_irqtrace_events+0x120/0x120 [ 158.726461] ? sched_clock_cpu+0x18/0x210 [ 158.730572] ? sched_clock_cpu+0x18/0x210 [ 158.734692] ? cyc2ns_read_end+0x10/0x10 [ 158.738705] ? skb_network_protocol+0x76/0x200 [ 158.743216] ? netif_skb_features+0x1b2/0x550 [ 158.747648] dev_hard_start_xmit+0x137/0x770 [ 158.752010] sch_direct_xmit+0x2ef/0x5d0 [ 158.755992] ? pfifo_fast_dequeue+0x3fa/0x670 [ 158.760460] ? pfifo_fast_change_tx_queue_len+0x810/0x810 [ 158.765975] ? __lock_is_held+0xa0/0x160 [ 158.770002] __qdisc_run+0x39e/0xfc0 [ 158.773673] ? _raw_spin_unlock+0x29/0x40 [ 158.777781] ? pfifo_fast_enqueue+0x24b/0x3e0 [ 158.782191] ? sch_direct_xmit+0x5d0/0x5d0 [ 158.786372] ? pfifo_fast_dequeue+0x670/0x670 [ 158.790818] ? __dev_queue_xmit+0x172/0x1770 [ 158.795195] ? preempt_count_sub+0xf/0xd0 [ 158.799313] __dev_queue_xmit+0x410/0x1770 [ 158.803512] ? ___slab_alloc+0x605/0x930 [ 158.807525] ? ___slab_alloc+0x605/0x930 [ 158.811540] ? memcpy+0x34/0x50 [ 158.814768] ? netdev_pick_tx+0x1c0/0x1c0 [ 158.818895] ? __skb_clone+0x2fd/0x3d0 [ 158.822712] ? __copy_skb_header+0x270/0x270 [ 158.827079] ? rcu_read_lock_sched_held+0x93/0xa0 [ 158.831903] ? kmem_cache_alloc+0x344/0x4d0 [ 158.836199] ? skb_clone+0x123/0x230 [ 158.839869] ? skb_split+0x820/0x820 [ 158.843521] ? tcf_mirred+0x554/0x930 [act_mirred] [ 158.848407] tcf_mirred+0x554/0x930 [act_mirred] [ 158.853104] ? tcf_mirred_act_wants_ingress.part.2+0x10/0x10 [act_mirred] [ 158.860005] ? __lock_acquire+0x706/0x26e0 [ 158.864162] ? mark_lock+0x13d/0xb40 [ 158.867832] tcf_action_exec+0xcf/0x2a0 [ 158.871736] tcf_classify+0xfa/0x340 [ 158.875402] __netif_receive_skb_core+0x8e1/0x1c60 [ 158.880334] ? nf_ingress+0x500/0x500 [ 158.884059] ? process_backlog+0x347/0x4b0 [ 158.888241] ? lock_acquire+0xd8/0x320 [ 158.892050] ? process_backlog+0x1b6/0x4b0 [ 158.896228] ? process_backlog+0xc2/0x4b0 [ 158.900291] process_backlog+0xc2/0x4b0 [ 158.904210] net_rx_action+0x5cc/0x980 [ 158.908047] ? napi_complete_done+0x2c0/0x2c0 [ 158.912525] ? rcu_read_unlock+0x80/0x80 [ 158.916534] ? __lock_is_held+0x34/0x160 [ 158.920541] __do_softirq+0x1d4/0x9d2 [ 158.924308] ? trace_event_raw_event_irq_handler_exit+0x140/0x140 [ 158.930515] run_ksoftirqd+0x1d/0x40 [ 158.934152] smpboot_thread_fn+0x32b/0x690 [ 158.938299] ? sort_range+0x20/0x20 [ 158.941842] ? preempt_count_sub+0xf/0xd0 [ 158.945940] ? schedule+0x5b/0x140 [ 158.949412] kthread+0x206/0x300 [ 158.952689] ? sort_range+0x20/0x20 [ 158.956249] ? kthread_stop+0x570/0x570 [ 158.960164] ret_from_fork+0x3a/0x50 [ 158.963823] Code: 14 3e ff 8b 4b 78 55 4d 89 f9 41 56 41 55 48 c7 c7 a0 cf db 82 41 54 44 8b 44 24 2c 48 8b 54 24 30 48 8b 74 24 20 e8 16 94 13 ff <0f> 0b 48 c7 c7 60 8e 1f 85 48 83 c4 20 e8 55 ef a6 ff 89 74 24 [ 158.983235] RIP: skb_panic+0xc3/0x100 RSP: ffff8801d3f27110 [ 158.988935] ---[ end trace 5af56ee845aa6cc8 ]--- [ 158.993641] Kernel panic - not syncing: Fatal exception in interrupt [ 159.000176] Kernel Offset: disabled [ 159.003767] ---[ end Kernel panic - not syncing: Fatal exception in interrupt ]--- Reproducer: ip link add h1 type veth peer name swp1 ip link add h3 type veth peer name swp3 ip link set dev h1 up ip address add 192.0.2.1/28 dev h1 ip link add dev vh3 type vrf table 20 ip link set dev h3 master vh3 ip link set dev vh3 up ip link set dev h3 up ip link set dev swp3 up ip address add dev swp3 2001:db8:2::1/64 ip link set dev swp1 up tc qdisc add dev swp1 clsact ip link add name gt6 type ip6gretap \ local 2001:db8:2::1 remote 2001:db8:2::2 ip link set dev gt6 up sleep 1 tc filter add dev swp1 ingress pref 1000 matchall skip_hw \ action mirred egress mirror dev gt6 ping -I h1 192.0.2.2 Fixes: c12b395 ("gre: Support GRE over IPv6") Signed-off-by: Petr Machata <petrm@mellanox.com> Acked-by: William Tu <u9012063@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>

dev->needed_headroom is not primed until ip6_tnl_xmit(), so it starts out zero. Thus the call to skb_cow_head() fails to actually make sure there's enough headroom to push the ERSPAN headers to. That can lead to the panic cited below. (Reproducer below that). Fix by requesting either needed_headroom if already primed, or just the bare minimum needed for the header otherwise. [ 190.703567] kernel BUG at net/core/skbuff.c:104! [ 190.708384] invalid opcode: 0000 [Ps3itaTeam#1] PREEMPT SMP KASAN PTI [ 190.714007] Modules linked in: act_mirred cls_matchall ip6_gre ip6_tunnel tunnel6 gre sch_ingress vrf veth x86_pkg_temp_thermal mlx_platform nfsd e1000e leds_mlxcpld [ 190.728975] CPU: 1 PID: 959 Comm: kworker/1:2 Not tainted 4.17.0-rc4-net_master-custom-139 torvalds#10 [ 190.737647] Hardware name: Mellanox Technologies Ltd. "MSN2410-CB2F"/"SA000874", BIOS 4.6.5 03/08/2016 [ 190.747006] Workqueue: ipv6_addrconf addrconf_dad_work [ 190.752222] RIP: 0010:skb_panic+0xc3/0x100 [ 190.756358] RSP: 0018:ffff8801d54072f0 EFLAGS: 00010282 [ 190.761629] RAX: 0000000000000085 RBX: ffff8801c1a8ecc0 RCX: 0000000000000000 [ 190.768830] RDX: 0000000000000085 RSI: dffffc0000000000 RDI: ffffed003aa80e54 [ 190.776025] RBP: ffff8801bd1ec5a0 R08: ffffed003aabce19 R09: ffffed003aabce19 [ 190.783226] R10: 0000000000000001 R11: ffffed003aabce18 R12: ffff8801bf695dbe [ 190.790418] R13: 0000000000000084 R14: 00000000000006c0 R15: ffff8801bf695dc8 [ 190.797621] FS: 0000000000000000(0000) GS:ffff8801d5400000(0000) knlGS:0000000000000000 [ 190.805786] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 190.811582] CR2: 000055fa929aced0 CR3: 0000000003228004 CR4: 00000000001606e0 [ 190.818790] Call Trace: [ 190.821264] <IRQ> [ 190.823314] ? ip6erspan_tunnel_xmit+0x5e4/0x1982 [ip6_gre] [ 190.828940] ? ip6erspan_tunnel_xmit+0x5e4/0x1982 [ip6_gre] [ 190.834562] skb_push+0x78/0x90 [ 190.837749] ip6erspan_tunnel_xmit+0x5e4/0x1982 [ip6_gre] [ 190.843219] ? ip6gre_tunnel_ioctl+0xd90/0xd90 [ip6_gre] [ 190.848577] ? debug_check_no_locks_freed+0x210/0x210 [ 190.853679] ? debug_check_no_locks_freed+0x210/0x210 [ 190.858783] ? print_irqtrace_events+0x120/0x120 [ 190.863451] ? sched_clock_cpu+0x18/0x210 [ 190.867496] ? cyc2ns_read_end+0x10/0x10 [ 190.871474] ? skb_network_protocol+0x76/0x200 [ 190.875977] dev_hard_start_xmit+0x137/0x770 [ 190.880317] ? do_raw_spin_trylock+0x6d/0xa0 [ 190.884624] sch_direct_xmit+0x2ef/0x5d0 [ 190.888589] ? pfifo_fast_dequeue+0x3fa/0x670 [ 190.892994] ? pfifo_fast_change_tx_queue_len+0x810/0x810 [ 190.898455] ? __lock_is_held+0xa0/0x160 [ 190.902422] __qdisc_run+0x39e/0xfc0 [ 190.906041] ? _raw_spin_unlock+0x29/0x40 [ 190.910090] ? pfifo_fast_enqueue+0x24b/0x3e0 [ 190.914501] ? sch_direct_xmit+0x5d0/0x5d0 [ 190.918658] ? pfifo_fast_dequeue+0x670/0x670 [ 190.923047] ? __dev_queue_xmit+0x172/0x1770 [ 190.927365] ? preempt_count_sub+0xf/0xd0 [ 190.931421] __dev_queue_xmit+0x410/0x1770 [ 190.935553] ? ___slab_alloc+0x605/0x930 [ 190.939524] ? print_irqtrace_events+0x120/0x120 [ 190.944186] ? memcpy+0x34/0x50 [ 190.947364] ? netdev_pick_tx+0x1c0/0x1c0 [ 190.951428] ? __skb_clone+0x2fd/0x3d0 [ 190.955218] ? __copy_skb_header+0x270/0x270 [ 190.959537] ? rcu_read_lock_sched_held+0x93/0xa0 [ 190.964282] ? kmem_cache_alloc+0x344/0x4d0 [ 190.968520] ? cyc2ns_read_end+0x10/0x10 [ 190.972495] ? skb_clone+0x123/0x230 [ 190.976112] ? skb_split+0x820/0x820 [ 190.979747] ? tcf_mirred+0x554/0x930 [act_mirred] [ 190.984582] tcf_mirred+0x554/0x930 [act_mirred] [ 190.989252] ? tcf_mirred_act_wants_ingress.part.2+0x10/0x10 [act_mirred] [ 190.996109] ? __lock_acquire+0x706/0x26e0 [ 191.000239] ? sched_clock_cpu+0x18/0x210 [ 191.004294] tcf_action_exec+0xcf/0x2a0 [ 191.008179] tcf_classify+0xfa/0x340 [ 191.011794] __netif_receive_skb_core+0x8e1/0x1c60 [ 191.016630] ? debug_check_no_locks_freed+0x210/0x210 [ 191.021732] ? nf_ingress+0x500/0x500 [ 191.025458] ? process_backlog+0x347/0x4b0 [ 191.029619] ? print_irqtrace_events+0x120/0x120 [ 191.034302] ? lock_acquire+0xd8/0x320 [ 191.038089] ? process_backlog+0x1b6/0x4b0 [ 191.042246] ? process_backlog+0xc2/0x4b0 [ 191.046303] process_backlog+0xc2/0x4b0 [ 191.050189] net_rx_action+0x5cc/0x980 [ 191.053991] ? napi_complete_done+0x2c0/0x2c0 [ 191.058386] ? mark_lock+0x13d/0xb40 [ 191.062001] ? clockevents_program_event+0x6b/0x1d0 [ 191.066922] ? print_irqtrace_events+0x120/0x120 [ 191.071593] ? __lock_is_held+0xa0/0x160 [ 191.075566] __do_softirq+0x1d4/0x9d2 [ 191.079282] ? ip6_finish_output2+0x524/0x1460 [ 191.083771] do_softirq_own_stack+0x2a/0x40 [ 191.087994] </IRQ> [ 191.090130] do_softirq.part.13+0x38/0x40 [ 191.094178] __local_bh_enable_ip+0x135/0x190 [ 191.098591] ip6_finish_output2+0x54d/0x1460 [ 191.102916] ? ip6_forward_finish+0x2f0/0x2f0 [ 191.107314] ? ip6_mtu+0x3c/0x2c0 [ 191.110674] ? ip6_finish_output+0x2f8/0x650 [ 191.114992] ? ip6_output+0x12a/0x500 [ 191.118696] ip6_output+0x12a/0x500 [ 191.122223] ? ip6_route_dev_notify+0x5b0/0x5b0 [ 191.126807] ? ip6_finish_output+0x650/0x650 [ 191.131120] ? ip6_fragment+0x1a60/0x1a60 [ 191.135182] ? icmp6_dst_alloc+0x26e/0x470 [ 191.139317] mld_sendpack+0x672/0x830 [ 191.143021] ? igmp6_mcf_seq_next+0x2f0/0x2f0 [ 191.147429] ? __local_bh_enable_ip+0x77/0x190 [ 191.151913] ipv6_mc_dad_complete+0x47/0x90 [ 191.156144] addrconf_dad_completed+0x561/0x720 [ 191.160731] ? addrconf_rs_timer+0x3a0/0x3a0 [ 191.165036] ? mark_held_locks+0xc9/0x140 [ 191.169095] ? __local_bh_enable_ip+0x77/0x190 [ 191.173570] ? addrconf_dad_work+0x50d/0xa20 [ 191.177886] ? addrconf_dad_work+0x529/0xa20 [ 191.182194] addrconf_dad_work+0x529/0xa20 [ 191.186342] ? addrconf_dad_completed+0x720/0x720 [ 191.191088] ? __lock_is_held+0xa0/0x160 [ 191.195059] ? process_one_work+0x45d/0xe20 [ 191.199302] ? process_one_work+0x51e/0xe20 [ 191.203531] ? rcu_read_lock_sched_held+0x93/0xa0 [ 191.208279] process_one_work+0x51e/0xe20 [ 191.212340] ? pwq_dec_nr_in_flight+0x200/0x200 [ 191.216912] ? get_lock_stats+0x4b/0xf0 [ 191.220788] ? preempt_count_sub+0xf/0xd0 [ 191.224844] ? worker_thread+0x219/0x860 [ 191.228823] ? do_raw_spin_trylock+0x6d/0xa0 [ 191.233142] worker_thread+0xeb/0x860 [ 191.236848] ? process_one_work+0xe20/0xe20 [ 191.241095] kthread+0x206/0x300 [ 191.244352] ? process_one_work+0xe20/0xe20 [ 191.248587] ? kthread_stop+0x570/0x570 [ 191.252459] ret_from_fork+0x3a/0x50 [ 191.256082] Code: 14 3e ff 8b 4b 78 55 4d 89 f9 41 56 41 55 48 c7 c7 a0 cf db 82 41 54 44 8b 44 24 2c 48 8b 54 24 30 48 8b 74 24 20 e8 16 94 13 ff <0f> 0b 48 c7 c7 60 8e 1f 85 48 83 c4 20 e8 55 ef a6 ff 89 74 24 [ 191.275327] RIP: skb_panic+0xc3/0x100 RSP: ffff8801d54072f0 [ 191.281024] ---[ end trace 7ea51094e099e006 ]--- [ 191.285724] Kernel panic - not syncing: Fatal exception in interrupt [ 191.292168] Kernel Offset: disabled [ 191.295697] ---[ end Kernel panic - not syncing: Fatal exception in interrupt ]--- Reproducer: ip link add h1 type veth peer name swp1 ip link add h3 type veth peer name swp3 ip link set dev h1 up ip address add 192.0.2.1/28 dev h1 ip link add dev vh3 type vrf table 20 ip link set dev h3 master vh3 ip link set dev vh3 up ip link set dev h3 up ip link set dev swp3 up ip address add dev swp3 2001:db8:2::1/64 ip link set dev swp1 up tc qdisc add dev swp1 clsact ip link add name gt6 type ip6erspan \ local 2001:db8:2::1 remote 2001:db8:2::2 oseq okey 123 ip link set dev gt6 up sleep 1 tc filter add dev swp1 ingress pref 1000 matchall skip_hw \ action mirred egress mirror dev gt6 ping -I h1 192.0.2.2 Fixes: e41c7c6 ("ip6erspan: make sure enough headroom at xmit.") Signed-off-by: Petr Machata <petrm@mellanox.com> Acked-by: William Tu <u9012063@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>

Petr Machata says: ==================== net: ip6_gre: Fixes in headroom handling This series mends some problems in headroom management in ip6_gre module. The current code base has the following three closely-related problems: - ip6gretap tunnels neglect to ensure there's enough writable headroom before pushing GRE headers. - ip6erspan does this, but assumes that dev->needed_headroom is primed. But that doesn't happen until ip6_tnl_xmit() is called later. Thus for the first packet, ip6erspan actually behaves like ip6gretap above. - ip6erspan shares some of the code with ip6gretap, including calculations of needed header length. While there is custom ERSPAN-specific code for calculating the headroom, the computed values are overwritten by the ip6gretap code. The first two issues lead to a kernel panic in situations where a packet is mirrored from a veth device to the device in question. They are fixed, respectively, in patches Ps3itaTeam#1 and Ps3itaTeam#2, which include the full panic trace and a reproducer. The rest of the patchset deals with the last issue. In patches Ps3itaTeam#3 to fail0verflow#6, several functions are split up into reusable parts. Finally in patch torvalds#7 these blocks are used to compose ERSPAN-specific callbacks where necessary to fix the hlen calculation. ==================== Signed-off-by: David S. Miller <davem@davemloft.net>

Recently during testing, I ran into the following panic: [ 207.892422] Internal error: Accessing user space memory outside uaccess.h routines: 96000004 [Ps3itaTeam#1] SMP [ 207.901637] Modules linked in: binfmt_misc [...] [ 207.966530] CPU: 45 PID: 2256 Comm: test_verifier Tainted: G W 4.17.0-rc3+ torvalds#7 [ 207.974956] Hardware name: FOXCONN R2-1221R-A4/C2U4N_MB, BIOS G31FB18A 03/31/2017 [ 207.982428] pstate: 60400005 (nZCv daif +PAN -UAO) [ 207.987214] pc : bpf_skb_load_helper_8_no_cache+0x34/0xc0 [ 207.992603] lr : 0xffff000000bdb754 [ 207.996080] sp : ffff000013703ca0 [ 207.999384] x29: ffff000013703ca0 x28: 0000000000000001 [ 208.004688] x27: 0000000000000001 x26: 0000000000000000 [ 208.009992] x25: ffff000013703ce0 x24: ffff800fb4afcb00 [ 208.015295] x23: ffff00007d2f5038 x22: ffff00007d2f5000 [ 208.020599] x21: fffffffffeff2a6f x20: 000000000000000a [ 208.025903] x19: ffff000009578000 x18: 0000000000000a03 [ 208.031206] x17: 0000000000000000 x16: 0000000000000000 [ 208.036510] x15: 0000ffff9de83000 x14: 0000000000000000 [ 208.041813] x13: 0000000000000000 x12: 0000000000000000 [ 208.047116] x11: 0000000000000001 x10: ffff0000089e7f18 [ 208.052419] x9 : fffffffffeff2a6f x8 : 0000000000000000 [ 208.057723] x7 : 000000000000000a x6 : 00280c6160000000 [ 208.063026] x5 : 0000000000000018 x4 : 0000000000007db6 [ 208.068329] x3 : 000000000008647a x2 : 19868179b1484500 [ 208.073632] x1 : 0000000000000000 x0 : ffff000009578c08 [ 208.078938] Process test_verifier (pid: 2256, stack limit = 0x0000000049ca7974) [ 208.086235] Call trace: [ 208.088672] bpf_skb_load_helper_8_no_cache+0x34/0xc0 [ 208.093713] 0xffff000000bdb754 [ 208.096845] bpf_test_run+0x78/0xf8 [ 208.100324] bpf_prog_test_run_skb+0x148/0x230 [ 208.104758] sys_bpf+0x314/0x1198 [ 208.108064] el0_svc_naked+0x30/0x34 [ 208.111632] Code: 91302260 f9400001 f9001fa1 d2800001 (29500680) [ 208.117717] ---[ end trace 263cb8a59b5bf29f ]--- The program itself which caused this had a long jump over the whole instruction sequence where all of the inner instructions required heavy expansions into multiple BPF instructions. Additionally, I also had BPF hardening enabled which requires once more rewrites of all constant values in order to blind them. Each time we rewrite insns, bpf_adj_branches() would need to potentially adjust branch targets which cross the patchlet boundary to accommodate for the additional delta. Eventually that lead to the case where the target offset could not fit into insn->off's upper 0x7fff limit anymore where then offset wraps around becoming negative (in s16 universe), or vice versa depending on the jump direction. Therefore it becomes necessary to detect and reject any such occasions in a generic way for native eBPF and cBPF to eBPF migrations. For the latter we can simply check bounds in the bpf_convert_filter()'s BPF_EMIT_JMP helper macro and bail out once we surpass limits. The bpf_patch_insn_single() for native eBPF (and cBPF to eBPF in case of subsequent hardening) is a bit more complex in that we need to detect such truncations before hitting the bpf_prog_realloc(). Thus the latter is split into an extra pass to probe problematic offsets on the original program in order to fail early. With that in place and carefully tested I no longer hit the panic and the rewrites are rejected properly. The above example panic I've seen on bpf-next, though the issue itself is generic in that a guard against this issue in bpf seems more appropriate in this case. Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Acked-by: Martin KaFai Lau <kafai@fb.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org>

Hangbin reported an Oops triggered by the syzkaller qdisc rules: kasan: GPF could be caused by NULL-ptr deref or user memory access general protection fault: 0000 [Ps3itaTeam#1] SMP KASAN PTI Modules linked in: sch_red CPU: 0 PID: 28699 Comm: syz-executor5 Not tainted 4.17.0-rc4.kcov Ps3itaTeam#1 Hardware name: Red Hat KVM, BIOS 0.5.1 01/01/2011 RIP: 0010:qdisc_hash_add+0x26/0xa0 RSP: 0018:ffff8800589cf470 EFLAGS: 00010203 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff824ad971 RDX: 0000000000000007 RSI: ffffc9000ce9f000 RDI: 000000000000003c RBP: 0000000000000001 R08: ffffed000b139ea2 R09: ffff8800589cf4f0 R10: ffff8800589cf50f R11: ffffed000b139ea2 R12: ffff880054019fc0 R13: ffff880054019fb4 R14: ffff88005c0af600 R15: ffff880054019fb0 FS: 00007fa6edcb1700(0000) GS:ffff88005ce00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020000740 CR3: 000000000fc16000 CR4: 00000000000006f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: red_change+0x2d2/0xed0 [sch_red] qdisc_create+0x57e/0xef0 tc_modify_qdisc+0x47f/0x14e0 rtnetlink_rcv_msg+0x6a8/0x920 netlink_rcv_skb+0x2a2/0x3c0 netlink_unicast+0x511/0x740 netlink_sendmsg+0x825/0xc30 sock_sendmsg+0xc5/0x100 ___sys_sendmsg+0x778/0x8e0 __sys_sendmsg+0xf5/0x1b0 do_syscall_64+0xbd/0x3b0 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x450869 RSP: 002b:00007fa6edcb0c48 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007fa6edcb16b4 RCX: 0000000000450869 RDX: 0000000000000000 RSI: 00000000200000c0 RDI: 0000000000000013 RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000008778 R14: 0000000000702838 R15: 00007fa6edcb1700 Code: e9 0b fe ff ff 0f 1f 44 00 00 55 53 48 89 fb 89 f5 e8 3f 07 f3 fe 48 8d 7b 3c 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <0f> b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 51 RIP: qdisc_hash_add+0x26/0xa0 RSP: ffff8800589cf470 When a red qdisc is updated with a 0 limit, the child qdisc is left unmodified, no additional scheduler is created in red_change(), the 'child' local variable is rightfully NULL and must not add it to the hash table. This change addresses the above issue moving qdisc_hash_add() right after the child qdisc creation. It additionally removes unneeded checks for noop_qdisc. Reported-by: Hangbin Liu <liuhangbin@gmail.com> Fixes: 49b4997 ("net: sched: make default fifo qdiscs appear in the dump") Signed-off-by: Paolo Abeni <pabeni@redhat.com> Acked-by: Jiri Kosina <jkosina@suse.cz> Signed-off-by: David S. Miller <davem@davemloft.net>

Add a test which shows a race in the multi-order iteration code. This test reliably hits the race in under a second on my machine, and is the result of a real bug report against kernel a production v4.15 based kernel (4.15.6-300.fc27.x86_64). With a real kernel this issue is hit when using order 9 PMD DAX radix tree entries. The race has to do with how we tear down multi-order sibling entries when we are removing an item from the tree. Remember that an order 2 entry looks like this: struct radix_tree_node.slots[] = [entry][sibling][sibling][sibling] where 'entry' is in some slot in the struct radix_tree_node, and the three slots following 'entry' contain sibling pointers which point back to 'entry.' When we delete 'entry' from the tree, we call : radix_tree_delete() radix_tree_delete_item() __radix_tree_delete() replace_slot() replace_slot() first removes the siblings in order from the first to the last, then at then replaces 'entry' with NULL. This means that for a brief period of time we end up with one or more of the siblings removed, so: struct radix_tree_node.slots[] = [entry][NULL][sibling][sibling] This causes an issue if you have a reader iterating over the slots in the tree via radix_tree_for_each_slot() while only under rcu_read_lock()/rcu_read_unlock() protection. This is a common case in mm/filemap.c. The issue is that when __radix_tree_next_slot() => skip_siblings() tries to skip over the sibling entries in the slots, it currently does so with an exact match on the slot directly preceding our current slot. Normally this works: V preceding slot struct radix_tree_node.slots[] = [entry][sibling][sibling][sibling] ^ current slot This lets you find the first sibling, and you skip them all in order. But in the case where one of the siblings is NULL, that slot is skipped and then our sibling detection is interrupted: V preceding slot struct radix_tree_node.slots[] = [entry][NULL][sibling][sibling] ^ current slot This means that the sibling pointers aren't recognized since they point all the way back to 'entry', so we think that they are normal internal radix tree pointers. This causes us to think we need to walk down to a struct radix_tree_node starting at the address of 'entry'. In a real running kernel this will crash the thread with a GP fault when you try and dereference the slots in your broken node starting at 'entry'. In the radix tree test suite this will be caught by the address sanitizer: ==27063==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x60c0008ae400 at pc 0x00000040ce4f bp 0x7fa89b8fcad0 sp 0x7fa89b8fcac0 READ of size 8 at 0x60c0008ae400 thread T3 #0 0x40ce4e in __radix_tree_next_slot /home/rzwisler/project/linux/tools/testing/radix-tree/radix-tree.c:1660 Ps3itaTeam#1 0x4022cc in radix_tree_next_slot linux/../../../../include/linux/radix-tree.h:567 Ps3itaTeam#2 0x4022cc in iterator_func /home/rzwisler/project/linux/tools/testing/radix-tree/multiorder.c:655 Ps3itaTeam#3 0x7fa8a088d50a in start_thread (/lib64/libpthread.so.0+0x750a) fail0verflow#4 0x7fa8a03bd16e in clone (/lib64/libc.so.6+0xf516e) Link: http://lkml.kernel.org/r/20180503192430.7582-5-ross.zwisler@linux.intel.com Signed-off-by: Ross Zwisler <ross.zwisler@linux.intel.com> Cc: Christoph Hellwig <hch@lst.de> Cc: CR, Sapthagirish <sapthagirish.cr@intel.com> Cc: Dan Williams <dan.j.williams@intel.com> Cc: Dave Chinner <david@fromorbit.com> Cc: Jan Kara <jack@suse.cz> Cc: Matthew Wilcox <willy@infradead.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Since get_kprobe_ctlblk() uses smp_processor_id() to access per-cpu variable, it hits smp_processor_id sanity check as below. [ 7.006928] BUG: using smp_processor_id() in preemptible [00000000] code: swapper/0/1 [ 7.007859] caller is debug_smp_processor_id+0x20/0x24 [ 7.008438] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 4.16.0-rc1-00192-g4eb17253e4b5 Ps3itaTeam#1 [ 7.008890] Hardware name: Generic DT based system [ 7.009917] [<c0313f0c>] (unwind_backtrace) from [<c030e6d8>] (show_stack+0x20/0x24) [ 7.010473] [<c030e6d8>] (show_stack) from [<c0c64694>] (dump_stack+0x84/0x98) [ 7.010990] [<c0c64694>] (dump_stack) from [<c071ca5c>] (check_preemption_disabled+0x138/0x13c) [ 7.011592] [<c071ca5c>] (check_preemption_disabled) from [<c071ca80>] (debug_smp_processor_id+0x20/0x24) [ 7.012214] [<c071ca80>] (debug_smp_processor_id) from [<c03335e0>] (optimized_callback+0x2c/0xe4) [ 7.013077] [<c03335e0>] (optimized_callback) from [<bf0021b0>] (0xbf0021b0) To fix this issue, call get_kprobe_ctlblk() right after irq-disabled since that disables preemption. Fixes: 0dc016d ("ARM: kprobes: enable OPTPROBES for ARM 32") Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org> Cc: stable@vger.kernel.org Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>

commit 8fb472c ("ipmr: improve hash scalability") added a call to rhltable_init() without checking its return value. This problem was then later copied to IPv6 and factorized in commit 0bbbf0e ("ipmr, ip6mr: Unite creation of new mr_table") kasan: CONFIG_KASAN_INLINE enabled kasan: GPF could be caused by NULL-ptr deref or user memory access general protection fault: 0000 [Ps3itaTeam#1] SMP KASAN Dumping ftrace buffer: (ftrace buffer empty) Modules linked in: CPU: 1 PID: 31552 Comm: syz-executor7 Not tainted 4.17.0-rc5+ torvalds#60 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:rht_key_hashfn include/linux/rhashtable.h:277 [inline] RIP: 0010:__rhashtable_lookup include/linux/rhashtable.h:630 [inline] RIP: 0010:rhltable_lookup include/linux/rhashtable.h:716 [inline] RIP: 0010:mr_mfc_find_parent+0x2ad/0xbb0 net/ipv4/ipmr_base.c:63 RSP: 0018:ffff8801826aef70 EFLAGS: 00010203 RAX: 0000000000000001 RBX: 0000000000000001 RCX: ffffc90001ea0000 RDX: 0000000000000079 RSI: ffffffff8661e859 RDI: 000000000000000c RBP: ffff8801826af1c0 R08: ffff8801b2212000 R09: ffffed003b5e46c2 R10: ffffed003b5e46c2 R11: ffff8801daf23613 R12: dffffc0000000000 R13: ffff8801826af198 R14: ffff8801cf8225c0 R15: ffff8801826af658 FS: 00007ff7fa732700(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000003ffffff9c CR3: 00000001b0210000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: ip6mr_cache_find_parent net/ipv6/ip6mr.c:981 [inline] ip6mr_mfc_delete+0x1fe/0x6b0 net/ipv6/ip6mr.c:1221 ip6_mroute_setsockopt+0x15c6/0x1d70 net/ipv6/ip6mr.c:1698 do_ipv6_setsockopt.isra.9+0x422/0x4660 net/ipv6/ipv6_sockglue.c:163 ipv6_setsockopt+0xbd/0x170 net/ipv6/ipv6_sockglue.c:922 rawv6_setsockopt+0x59/0x140 net/ipv6/raw.c:1060 sock_common_setsockopt+0x9a/0xe0 net/core/sock.c:3039 __sys_setsockopt+0x1bd/0x390 net/socket.c:1903 __do_sys_setsockopt net/socket.c:1914 [inline] __se_sys_setsockopt net/socket.c:1911 [inline] __x64_sys_setsockopt+0xbe/0x150 net/socket.c:1911 do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x49/0xbe Fixes: 8fb472c ("ipmr: improve hash scalability") Fixes: 0bbbf0e ("ipmr, ip6mr: Unite creation of new mr_table") Signed-off-by: Eric Dumazet <edumazet@google.com> Cc: Nikolay Aleksandrov <nikolay@cumulusnetworks.com> Cc: Yuval Mintz <yuvalm@mellanox.com> Reported-by: syzbot <syzkaller@googlegroups.com> Acked-by: Nikolay Aleksandrov <nikolay@cumulusnetworks.com> Signed-off-by: David S. Miller <davem@davemloft.net>

Dasd uses completion_data from struct request to store per request private data - this is problematic since this member is part of a union which is also used by IO schedulers. Let the block layer maintain space for per request data behind each struct request. Fixes crashes on block layer timeouts like this one: Unable to handle kernel pointer dereference in virtual kernel address space Failing address: 0000000000000000 TEID: 0000000000000483 Fault in home space mode while using kernel ASCE. AS:0000000001308007 R3:00000000fffc8007 S:00000000fffcc000 P:000000000000013d Oops: 0004 ilc:2 [Ps3itaTeam#1] PREEMPT SMP Modules linked in: [...] CPU: 0 PID: 1480 Comm: kworker/0:2H Not tainted 4.17.0-rc4-00046-gaa3bcd43b5af torvalds#203 Hardware name: IBM 3906 M02 702 (LPAR) Workqueue: kblockd blk_mq_timeout_work Krnl PSW : 0000000067ac406b 00000000b6960308 (do_raw_spin_trylock+0x30/0x78) R:0 T:1 IO:0 EX:0 Key:0 M:1 W:0 P:0 AS:3 CC:2 PM:0 RI:0 EA:3 Krnl GPRS: 0000000000000c00 0000000000000000 0000000000000000 0000000000000001 0000000000b9d3c8 0000000000000000 0000000000000001 00000000cf9639d8 0000000000000000 0700000000000000 0000000000000000 000000000099f09e 0000000000000000 000000000076e9d0 000000006247bb08 000000006247bae0 Krnl Code: 00000000001c159c: b90400c2 lgr %r12,%r2 00000000001c15a0: a7180000 lhi %r1,0 #00000000001c15a4: 583003a4 l %r3,932 >00000000001c15a8: ba132000 cs %r1,%r3,0(%r2) 00000000001c15ac: a718000 lhi %r1,1 00000000001c15b0: a784000b brc 8,1c15c6 00000000001c15b4: c0e5004e72aa brasl %r14,b8fb08 00000000001c15ba: 1812 lr %r1,%r2 Call Trace: ([<0700000000000000>] 0x700000000000000) [<0000000000b9d3d2>] _raw_spin_lock_irqsave+0x7a/0xb8 [<000000000099f09e>] dasd_times_out+0x46/0x278 [<000000000076ea6e>] blk_mq_terminate_expired+0x9e/0x108 [<000000000077497a>] bt_for_each+0x102/0x130 [<0000000000774e54>] blk_mq_queue_tag_busy_iter+0x74/0xd8 [<000000000076fea0>] blk_mq_timeout_work+0x260/0x320 [<0000000000169dd4>] process_one_work+0x3bc/0x708 [<000000000016a382>] worker_thread+0x262/0x408 [<00000000001723a8>] kthread+0x160/0x178 [<0000000000b9e73a>] kernel_thread_starter+0x6/0xc [<0000000000b9e734>] kernel_thread_starter+0x0/0xc INFO: lockdep is turned off. Last Breaking-Event-Address: [<0000000000b9d3cc>] _raw_spin_lock_irqsave+0x74/0xb8 Kernel panic - not syncing: Fatal exception: panic_on_oops Signed-off-by: Sebastian Ott <sebott@linux.ibm.com> Reviewed-by: Stefan Haberland <sth@linux.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

syzkaller reports for buffer overflow for interface name when starting sync daemons [1] What we do is that we copy user structure into larger stack buffer but later we search NUL past the stack buffer. The same happens for sched_name when adding/editing virtual server. We are restricted by IP_VS_SCHEDNAME_MAXLEN and IP_VS_IFNAME_MAXLEN being used as size in include/uapi/linux/ip_vs.h, so they include the space for NUL. As using strlcpy is wrong for unsafe source, replace it with strscpy and add checks to return EINVAL if source string is not NUL-terminated. The incomplete strlcpy fix comes from 2.6.13. For the netlink interface reduce the len parameter for IPVS_DAEMON_ATTR_MCAST_IFN and IPVS_SVC_ATTR_SCHED_NAME, so that we get proper EINVAL. [1] kernel BUG at lib/string.c:1052! invalid opcode: 0000 [Ps3itaTeam#1] SMP KASAN Dumping ftrace buffer: (ftrace buffer empty) Modules linked in: CPU: 1 PID: 373 Comm: syz-executor936 Not tainted 4.17.0-rc4+ torvalds#45 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:fortify_panic+0x13/0x20 lib/string.c:1051 RSP: 0018:ffff8801c976f800 EFLAGS: 00010282 RAX: 0000000000000022 RBX: 0000000000000040 RCX: 0000000000000000 RDX: 0000000000000022 RSI: ffffffff8160f6f1 RDI: ffffed00392edef6 RBP: ffff8801c976f800 R08: ffff8801cf4c62c0 R09: ffffed003b5e4fb0 R10: ffffed003b5e4fb0 R11: ffff8801daf27d87 R12: ffff8801c976fa20 R13: ffff8801c976fae4 R14: ffff8801c976fae0 R15: 000000000000048b FS: 00007fd99f75e700(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000200001c0 CR3: 00000001d6843000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: strlen include/linux/string.h:270 [inline] strlcpy include/linux/string.h:293 [inline] do_ip_vs_set_ctl+0x31c/0x1d00 net/netfilter/ipvs/ip_vs_ctl.c:2388 nf_sockopt net/netfilter/nf_sockopt.c:106 [inline] nf_setsockopt+0x7d/0xd0 net/netfilter/nf_sockopt.c:115 ip_setsockopt+0xd8/0xf0 net/ipv4/ip_sockglue.c:1253 udp_setsockopt+0x62/0xa0 net/ipv4/udp.c:2487 ipv6_setsockopt+0x149/0x170 net/ipv6/ipv6_sockglue.c:917 tcp_setsockopt+0x93/0xe0 net/ipv4/tcp.c:3057 sock_common_setsockopt+0x9a/0xe0 net/core/sock.c:3046 __sys_setsockopt+0x1bd/0x390 net/socket.c:1903 __do_sys_setsockopt net/socket.c:1914 [inline] __se_sys_setsockopt net/socket.c:1911 [inline] __x64_sys_setsockopt+0xbe/0x150 net/socket.c:1911 do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x447369 RSP: 002b:00007fd99f75dda8 EFLAGS: 00000246 ORIG_RAX: 0000000000000036 RAX: ffffffffffffffda RBX: 00000000006e39e4 RCX: 0000000000447369 RDX: 000000000000048b RSI: 0000000000000000 RDI: 0000000000000003 RBP: 0000000000000000 R08: 0000000000000018 R09: 0000000000000000 R10: 00000000200001c0 R11: 0000000000000246 R12: 00000000006e39e0 R13: 75a1ff93f0896195 R14: 6f745f3168746576 R15: 0000000000000001 Code: 08 5b 41 5c 41 5d 41 5e 41 5f 5d c3 0f 0b 48 89 df e8 d2 8f 48 fa eb de 55 48 89 fe 48 c7 c7 60 65 64 88 48 89 e5 e8 91 dd f3 f9 <0f> 0b 90 90 90 90 90 90 90 90 90 90 90 55 48 89 e5 41 57 41 56 RIP: fortify_panic+0x13/0x20 lib/string.c:1051 RSP: ffff8801c976f800 Reported-and-tested-by: syzbot+aac887f77319868646df@syzkaller.appspotmail.com Fixes: e4ff675 ("ipvs: add sync_maxlen parameter for the sync daemon") Fixes: 4da62fc ("[IPVS]: Fix for overflows") Signed-off-by: Julian Anastasov <ja@ssi.bg> Acked-by: Simon Horman <horms+renesas@verge.net.au> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

If a instance has an event trigger enabled when it is freed, it could cause an access of free memory. Here's the case that crashes: # cd /sys/kernel/tracing # mkdir instances/foo # echo snapshot > instances/foo/events/initcall/initcall_start/trigger # rmdir instances/foo Would produce: general protection fault: 0000 [Ps3itaTeam#1] PREEMPT SMP PTI Modules linked in: tun bridge ... CPU: 5 PID: 6203 Comm: rmdir Tainted: G W 4.17.0-rc4-test+ torvalds#933 Hardware name: Hewlett-Packard HP Compaq Pro 6300 SFF/339A, BIOS K01 v03.03 07/14/2016 RIP: 0010:clear_event_triggers+0x3b/0x70 RSP: 0018:ffffc90003783de0 EFLAGS: 00010286 RAX: 0000000000000000 RBX: 6b6b6b6b6b6b6b2b RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff8800c7130ba0 RBP: ffffc90003783e00 R08: ffff8801131993f8 R09: 0000000100230016 R10: ffffc90003783d80 R11: 0000000000000000 R12: ffff8800c7130ba0 R13: ffff8800c7130bd8 R14: ffff8800cc093768 R15: 00000000ffffff9c FS: 00007f6f4aa86700(0000) GS:ffff88011eb40000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f6f4a5aed60 CR3: 00000000cd552001 CR4: 00000000001606e0 Call Trace: event_trace_del_tracer+0x2a/0xc5 instance_rmdir+0x15c/0x200 tracefs_syscall_rmdir+0x52/0x90 vfs_rmdir+0xdb/0x160 do_rmdir+0x16d/0x1c0 __x64_sys_rmdir+0x17/0x20 do_syscall_64+0x55/0x1a0 entry_SYSCALL_64_after_hwframe+0x49/0xbe This was due to the call the clears out the triggers when an instance is being deleted not removing the trigger from the link list. Cc: stable@vger.kernel.org Fixes: 85f2b08 ("tracing: Add basic event trigger framework") Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>

…n phase Delay registering ourselves with the acpi lid notification mechanism until we are registering the connectors after initialisation is complete. This prevents a possibility of trying to handle the lid notification before we are ready with the danger of chasing uninitialised function pointers. BUG: unable to handle kernel NULL pointer dereference at 0000000000000000 IP: (null) PGD 0 P4D 0 Oops: 0010 [Ps3itaTeam#1] PREEMPT SMP PTI Modules linked in: arc4(+) iwldvm(+) i915(+) mac80211 i2c_algo_bit coretemp mei_wdt iwlwifi drm_kms_helper kvm_intel wmi_bmof iTCO_wdt iTCO_vendor_support kvm snd_hda_codec_conexant snd_hda_codec_generic drm psmouse cfg80211 irqbypass input_leds pcspkr i2c_i801 snd_hda_intel snd_hda_codec thinkpad_acpi snd_hda_core mei_me lpc_ich snd_hwdep e1000e wmi nvram snd_pcm mei snd_timer shpchp ptp pps_core rfkill syscopyarea snd intel_agp sysfillrect intel_gtt soundcore sysimgblt battery led_class fb_sys_fops ac rtc_cmos agpgart evdev mac_hid acpi_cpufreq ip_tables x_tables ext4 crc32c_generic crc16 mbcache jbd2 fscrypto crypto_simd glue_helper cryptd aes_x86_64 xts algif_skcipher af_alg dm_crypt dm_mod sd_mod uas usb_storage serio_raw atkbd libps2 ahci libahci uhci_hcd libata scsi_mod ehci_pci ehci_hcd usbcore usb_common i8042 serio CPU: 1 PID: 378 Comm: systemd-logind Not tainted 4.16.8-1-ARCH Ps3itaTeam#1 Hardware name: LENOVO 7454CTO/7454CTO, BIOS 6DET72WW (3.22 ) 10/25/2012 RIP: 0010: (null) RSP: 0018:ffffaf4580c33a18 EFLAGS: 00010287 RAX: 0000000000000000 RBX: ffff947533558000 RCX: 000000000000003e RDX: ffffffffc0aa80c0 RSI: ffffaf4580c33a3c RDI: ffff947534e4c000 RBP: ffff947533558338 R08: ffff947534598930 R09: ffffffffc0a928b1 R10: ffffd8f181d5fd40 R11: 0000000000000000 R12: ffffffffc0a928b1 R13: ffff947533558368 R14: ffffffffc0a928a9 R15: ffff947534e4c000 FS: 00007f3dc4ddb940(0000) GS:ffff947539280000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 000000006e214000 CR4: 00000000000406e0 Call Trace: ? intel_modeset_setup_hw_state+0x385/0xf60 [i915] ? __intel_display_resume+0x1e/0xc0 [i915] ? intel_display_resume+0xcc/0x120 [i915] ? intel_lid_notify+0xbc/0xc0 [i915] ? notifier_call_chain+0x47/0x70 ? blocking_notifier_call_chain+0x3e/0x60 ? acpi_lid_notify_state+0x8f/0x1d0 ? acpi_lid_update_state+0x49/0x70 ? acpi_lid_input_open+0x60/0x90 ? input_open_device+0x5d/0xa0 ? evdev_open+0x1ba/0x1e0 [evdev] ? chrdev_open+0xa3/0x1b0 ? cdev_put.part.0+0x20/0x20 ? do_dentry_open+0x14c/0x300 ? path_openat+0x30c/0x1240 ? current_time+0x16/0x60 ? do_filp_open+0x93/0x100 ? __check_object_size+0xfb/0x180 ? do_sys_open+0x186/0x210 ? do_syscall_64+0x74/0x190 ? entry_SYSCALL_64_after_hwframe+0x3d/0xa2 Code: Bad RIP value. RIP: (null) RSP: ffffaf4580c33a18 CR2: 0000000000000000 Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=106559 Fixes: c1c7af6 ("drm/i915: force mode set at lid open time") Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com> Cc: Ville Syrjälä <ville.syrjala@linux.intel.com> Cc: Daniel Vetter <daniel.vetter@ffwll.ch> Reviewed-by: Jani Nikula <jani.nikula@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20180518074840.16194-1-chris@chris-wilson.co.uk Cc: stable@vger.kernel.org (cherry picked from commit e578a57) Signed-off-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>

The table field in nft_obj_filter is not an array. In order to check tablename, we should check if the pointer is set. Test commands: %nft add table ip filter %nft add counter ip filter ct1 %nft reset counters Splat looks like: [ 306.510504] kasan: CONFIG_KASAN_INLINE enabled [ 306.516184] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 306.524775] general protection fault: 0000 [Ps3itaTeam#1] SMP DEBUG_PAGEALLOC KASAN PTI [ 306.528284] Modules linked in: nft_objref nft_counter nf_tables nfnetlink ip_tables x_tables [ 306.528284] CPU: 0 PID: 1488 Comm: nft Not tainted 4.17.0-rc4+ torvalds#17 [ 306.528284] Hardware name: To be filled by O.E.M. To be filled by O.E.M./Aptio CRB, BIOS 5.6.5 07/08/2015 [ 306.528284] RIP: 0010:nf_tables_dump_obj+0x52c/0xa70 [nf_tables] [ 306.528284] RSP: 0018:ffff8800b6cb7520 EFLAGS: 00010246 [ 306.528284] RAX: 0000000000000000 RBX: ffff8800b6c49820 RCX: 0000000000000000 [ 306.528284] RDX: 0000000000000000 RSI: dffffc0000000000 RDI: ffffed0016d96e9a [ 306.528284] RBP: ffff8800b6cb75c0 R08: ffffed00236fce7c R09: ffffed00236fce7b [ 306.528284] R10: ffffffff9f6241e8 R11: ffffed00236fce7c R12: ffff880111365108 [ 306.528284] R13: 0000000000000000 R14: ffff8800b6c49860 R15: ffff8800b6c49860 [ 306.528284] FS: 00007f838b007700(0000) GS:ffff88011b600000(0000) knlGS:0000000000000000 [ 306.528284] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 306.528284] CR2: 00007ffeafabcf78 CR3: 00000000b6cbe000 CR4: 00000000001006f0 [ 306.528284] Call Trace: [ 306.528284] netlink_dump+0x470/0xa20 [ 306.528284] __netlink_dump_start+0x5ae/0x690 [ 306.528284] ? nf_tables_getobj+0x1b3/0x740 [nf_tables] [ 306.528284] nf_tables_getobj+0x2f5/0x740 [nf_tables] [ 306.528284] ? nft_obj_notify+0x100/0x100 [nf_tables] [ 306.528284] ? nf_tables_getobj+0x740/0x740 [nf_tables] [ 306.528284] ? nf_tables_dump_flowtable_done+0x70/0x70 [nf_tables] [ 306.528284] ? nft_obj_notify+0x100/0x100 [nf_tables] [ 306.528284] nfnetlink_rcv_msg+0x8ff/0x932 [nfnetlink] [ 306.528284] ? nfnetlink_rcv_msg+0x216/0x932 [nfnetlink] [ 306.528284] netlink_rcv_skb+0x1c9/0x2f0 [ 306.528284] ? nfnetlink_bind+0x1d0/0x1d0 [nfnetlink] [ 306.528284] ? debug_check_no_locks_freed+0x270/0x270 [ 306.528284] ? netlink_ack+0x7a0/0x7a0 [ 306.528284] ? ns_capable_common+0x6e/0x110 [ ... ] Fixes: e46abbc ("netfilter: nf_tables: Allow table names of up to 255 chars") Signed-off-by: Taehee Yoo <ap420073@gmail.com> Acked-by: Florian Westphal <fw@strlen.de> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

Since an SRP remote port is attached as a child to shost->shost_gendev and as the only child, the translation from the shost pointer into an rport pointer must happen by looking up the shost child that is an rport. This patch fixes the following KASAN complaint: BUG: KASAN: slab-out-of-bounds in srp_timed_out+0x57/0x110 [scsi_transport_srp] Read of size 4 at addr ffff880035d3fcc0 by task kworker/1:0H/19 CPU: 1 PID: 19 Comm: kworker/1:0H Not tainted 4.16.0-rc3-dbg+ Ps3itaTeam#1 Workqueue: kblockd blk_mq_timeout_work Call Trace: dump_stack+0x85/0xc7 print_address_description+0x65/0x270 kasan_report+0x231/0x350 srp_timed_out+0x57/0x110 [scsi_transport_srp] scsi_times_out+0xc7/0x3f0 [scsi_mod] blk_mq_terminate_expired+0xc2/0x140 bt_iter+0xbc/0xd0 blk_mq_queue_tag_busy_iter+0x1c7/0x350 blk_mq_timeout_work+0x325/0x3f0 process_one_work+0x441/0xa50 worker_thread+0x76/0x6c0 kthread+0x1b2/0x1d0 ret_from_fork+0x24/0x30 Fixes: e68ca75 ("scsi_transport_srp: Reduce failover time") Signed-off-by: Bart Van Assche <bart.vanassche@wdc.com> Cc: Hannes Reinecke <hare@suse.com> Cc: Johannes Thumshirn <jthumshirn@suse.de> Cc: Jason Gunthorpe <jgg@mellanox.com> Cc: Doug Ledford <dledford@redhat.com> Cc: Laurence Oberman <loberman@redhat.com> Cc: stable@vger.kernel.org Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

Calling XDP redirection requires bh disabled. Softirq can call another XDP function and redirection functions, then the percpu static variable ri->map can be overwritten to NULL. This is a generic XDP case called from tun. [ 3535.736058] BUG: unable to handle kernel NULL pointer dereference at 0000000000000018 [ 3535.743974] PGD 0 P4D 0 [ 3535.746530] Oops: 0000 [Ps3itaTeam#1] SMP PTI [ 3535.750049] Modules linked in: vhost_net vhost tap tun bridge stp llc ebtable_filter ebtables ip6table_filter ip6_tables iptable_filter sunrpc vfat fat ext4 mbcache jbd2 intel_rapl skx_edac nfit libnvdimm x86_pkg_temp_thermal intel_powerclamp coretemp kvm_intel kvm ipmi_ssif irqbypass crct10dif_pclmul crc32_pclmul ghash_clmulni_intel pcbc ses aesni_intel crypto_simd cryptd enclosure hpwdt hpilo glue_helper ipmi_si pcspkr wmi mei_me ioatdma mei ipmi_devintf shpchp dca ipmi_msghandler lpc_ich acpi_power_meter sch_fq_codel ip_tables xfs libcrc32c sd_mod mgag200 i2c_algo_bit drm_kms_helper syscopyarea sysfillrect sysimgblt fb_sys_fops ttm drm smartpqi i40e crc32c_intel scsi_transport_sas tg3 i2c_core ptp pps_core [ 3535.813456] CPU: 5 PID: 1630 Comm: vhost-1614 Not tainted 4.17.0-rc4 Ps3itaTeam#2 [ 3535.820127] Hardware name: HPE ProLiant DL360 Gen10/ProLiant DL360 Gen10, BIOS U32 11/14/2017 [ 3535.828732] RIP: 0010:__xdp_map_lookup_elem+0x5/0x30 [ 3535.833740] RSP: 0018:ffffb4bc47bf7c58 EFLAGS: 00010246 [ 3535.839009] RAX: ffff9fdfcfea1c40 RBX: 0000000000000000 RCX: ffff9fdf27fe3100 [ 3535.846205] RDX: ffff9fdfca769200 RSI: 0000000000000000 RDI: 0000000000000000 [ 3535.853402] RBP: ffffb4bc491d9000 R08: 00000000000045ad R09: 0000000000000ec0 [ 3535.860597] R10: 0000000000000001 R11: ffff9fdf26c3ce4e R12: ffff9fdf9e72c000 [ 3535.867794] R13: 0000000000000000 R14: fffffffffffffff2 R15: ffff9fdfc82cdd00 [ 3535.874990] FS: 0000000000000000(0000) GS:ffff9fdfcfe80000(0000) knlGS:0000000000000000 [ 3535.883152] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 3535.888948] CR2: 0000000000000018 CR3: 0000000bde724004 CR4: 00000000007626e0 [ 3535.896145] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 3535.903342] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 3535.910538] PKRU: 55555554 [ 3535.913267] Call Trace: [ 3535.915736] xdp_do_generic_redirect+0x7a/0x310 [ 3535.920310] do_xdp_generic.part.117+0x285/0x370 [ 3535.924970] tun_get_user+0x5b9/0x1260 [tun] [ 3535.929279] tun_sendmsg+0x52/0x70 [tun] [ 3535.933237] handle_tx+0x2ad/0x5f0 [vhost_net] [ 3535.937721] vhost_worker+0xa5/0x100 [vhost] [ 3535.942030] kthread+0xf5/0x130 [ 3535.945198] ? vhost_dev_ioctl+0x3b0/0x3b0 [vhost] [ 3535.950031] ? kthread_bind+0x10/0x10 [ 3535.953727] ret_from_fork+0x35/0x40 [ 3535.957334] Code: 0e 74 15 83 f8 10 75 05 e9 49 aa b3 ff f3 c3 0f 1f 80 00 00 00 00 f3 c3 e9 29 9d b3 ff 66 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 <8b> 47 18 83 f8 0e 74 0d 83 f8 10 75 05 e9 49 a9 b3 ff 31 c0 c3 [ 3535.976387] RIP: __xdp_map_lookup_elem+0x5/0x30 RSP: ffffb4bc47bf7c58 [ 3535.982883] CR2: 0000000000000018 [ 3535.987096] ---[ end trace 383b299dd1430240 ]--- [ 3536.131325] Kernel panic - not syncing: Fatal exception [ 3536.137484] Kernel Offset: 0x26a00000 from 0xffffffff81000000 (relocation range: 0xffffffff80000000-0xffffffffbfffffff) [ 3536.281406] ---[ end Kernel panic - not syncing: Fatal exception ]--- And a kernel with generic case fixed still panics in tun driver XDP redirect, because it disabled only preemption, but not bh. [ 2055.128746] BUG: unable to handle kernel NULL pointer dereference at 0000000000000018 [ 2055.136662] PGD 0 P4D 0 [ 2055.139219] Oops: 0000 [Ps3itaTeam#1] SMP PTI [ 2055.142736] Modules linked in: vhost_net vhost tap tun bridge stp llc ebtable_filter ebtables ip6table_filter ip6_tables iptable_filter sunrpc vfat fat ext4 mbcache jbd2 intel_rapl skx_edac nfit libnvdimm x86_pkg_temp_thermal intel_powerclamp coretemp kvm_intel kvm irqbypass crct10dif_pclmul crc32_pclmul ghash_clmulni_intel pcbc ses aesni_intel ipmi_ssif crypto_simd enclosure cryptd hpwdt glue_helper ioatdma hpilo wmi dca pcspkr ipmi_si acpi_power_meter ipmi_devintf shpchp mei_me ipmi_msghandler mei lpc_ich sch_fq_codel ip_tables xfs libcrc32c sd_mod mgag200 i2c_algo_bit drm_kms_helper syscopyarea sysfillrect sysimgblt fb_sys_fops ttm drm i40e smartpqi tg3 scsi_transport_sas crc32c_intel i2c_core ptp pps_core [ 2055.206142] CPU: 6 PID: 1693 Comm: vhost-1683 Tainted: G W 4.17.0-rc5-fix-tun+ Ps3itaTeam#1 [ 2055.215011] Hardware name: HPE ProLiant DL360 Gen10/ProLiant DL360 Gen10, BIOS U32 11/14/2017 [ 2055.223617] RIP: 0010:__xdp_map_lookup_elem+0x5/0x30 [ 2055.228624] RSP: 0018:ffff998b07607cc0 EFLAGS: 00010246 [ 2055.233892] RAX: ffff8dbd8e235700 RBX: ffff8dbd8ff21c40 RCX: 0000000000000004 [ 2055.241089] RDX: ffff998b097a9000 RSI: 0000000000000000 RDI: 0000000000000000 [ 2055.248286] RBP: 0000000000000000 R08: 00000000000065a8 R09: 0000000000005d80 [ 2055.255483] R10: 0000000000000040 R11: ffff8dbcf0100000 R12: ffff998b097a9000 [ 2055.262681] R13: ffff8dbd8c98c000 R14: 0000000000000000 R15: ffff998b07607d78 [ 2055.269879] FS: 0000000000000000(0000) GS:ffff8dbd8ff00000(0000) knlGS:0000000000000000 [ 2055.278039] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 2055.283834] CR2: 0000000000000018 CR3: 0000000c0c8cc005 CR4: 00000000007626e0 [ 2055.291030] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 2055.298227] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 2055.305424] PKRU: 55555554 [ 2055.308153] Call Trace: [ 2055.310624] xdp_do_redirect+0x7b/0x380 [ 2055.314499] tun_get_user+0x10fe/0x12a0 [tun] [ 2055.318895] tun_sendmsg+0x52/0x70 [tun] [ 2055.322852] handle_tx+0x2ad/0x5f0 [vhost_net] [ 2055.327337] vhost_worker+0xa5/0x100 [vhost] [ 2055.331646] kthread+0xf5/0x130 [ 2055.334813] ? vhost_dev_ioctl+0x3b0/0x3b0 [vhost] [ 2055.339646] ? kthread_bind+0x10/0x10 [ 2055.343343] ret_from_fork+0x35/0x40 [ 2055.346950] Code: 0e 74 15 83 f8 10 75 05 e9 e9 aa b3 ff f3 c3 0f 1f 80 00 00 00 00 f3 c3 e9 c9 9d b3 ff 66 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 <8b> 47 18 83 f8 0e 74 0d 83 f8 10 75 05 e9 e9 a9 b3 ff 31 c0 c3 [ 2055.366004] RIP: __xdp_map_lookup_elem+0x5/0x30 RSP: ffff998b07607cc0 [ 2055.372500] CR2: 0000000000000018 [ 2055.375856] ---[ end trace 2a2dcc5e9e174268 ]--- [ 2055.523626] Kernel panic - not syncing: Fatal exception [ 2055.529796] Kernel Offset: 0x2e000000 from 0xffffffff81000000 (relocation range: 0xffffffff80000000-0xffffffffbfffffff) [ 2055.677539] ---[ end Kernel panic - not syncing: Fatal exception ]--- v2: - Removed preempt_disable/enable since local_bh_disable will prevent preemption as well, feedback from Jason Wang. Fixes: 761876c ("tap: XDP support") Signed-off-by: Toshiaki Makita <makita.toshiaki@lab.ntt.co.jp> Acked-by: Jason Wang <jasowang@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>

The dw_hdmi_setup_rx_sense exported function should not use struct device to recover the dw-hdmi context using drvdata, but take struct dw_hdmi directly like other exported functions. This caused a regression using Meson DRM on S905X since v4.17-rc1 : Internal error: Oops: 96000007 [Ps3itaTeam#1] PREEMPT SMP [...] CPU: 0 PID: 124 Comm: irq/32-dw_hdmi_ Not tainted 4.17.0-rc7 Ps3itaTeam#2 Hardware name: Libre Technology CC (DT) [...] pc : osq_lock+0x54/0x188 lr : __mutex_lock.isra.0+0x74/0x530 [...] Process irq/32-dw_hdmi_ (pid: 124, stack limit = 0x00000000adf418cb) Call trace: osq_lock+0x54/0x188 __mutex_lock_slowpath+0x10/0x18 mutex_lock+0x30/0x38 __dw_hdmi_setup_rx_sense+0x28/0x98 dw_hdmi_setup_rx_sense+0x10/0x18 dw_hdmi_top_thread_irq+0x2c/0x50 irq_thread_fn+0x28/0x68 irq_thread+0x10c/0x1a0 kthread+0x128/0x130 ret_from_fork+0x10/0x18 Code: 34000964 d00050a2 51000484 9135c042 (f864d844) ---[ end trace 945641e1fbbc07da ]--- note: irq/32-dw_hdmi_[124] exited with preempt_count 1 genirq: exiting task "irq/32-dw_hdmi_" (124) is an active IRQ thread (irq 32) Fixes: eea034a ("drm/bridge/synopsys: dw-hdmi: don't clobber drvdata") Signed-off-by: Neil Armstrong <narmstrong@baylibre.com> Tested-by: Koen Kooi <koen@dominion.thruhere.net> Signed-off-by: Sean Paul <seanpaul@chromium.org> Link: https://patchwork.freedesktop.org/patch/msgid/1527673438-20643-1-git-send-email-narmstrong@baylibre.com

Do not perform the rfkill cleanup routine when (asus->driver->wlan_ctrl_by_user && ashs_present()) is true, since nothing is registered with the rfkill subsystem in that case. Doing so leads to the following kernel NULL pointer dereference: BUG: unable to handle kernel NULL pointer dereference at (null) IP: [<ffffffff816c7348>] __mutex_lock_slowpath+0x98/0x120 PGD 1a3aa8067 PUD 1a3b3d067 PMD 0 Oops: 0002 [Ps3itaTeam#1] PREEMPT SMP Modules linked in: bnep ccm binfmt_misc uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_v4l2 videobuf2_core hid_a4tech videodev x86_pkg_temp_thermal intel_powerclamp coretemp ath3k btusb btrtl btintel bluetooth kvm_intel snd_hda_codec_hdmi kvm snd_hda_codec_realtek snd_hda_codec_generic irqbypass crc32c_intel arc4 i915 snd_hda_intel snd_hda_codec ath9k ath9k_common ath9k_hw ath i2c_algo_bit snd_hwdep mac80211 ghash_clmulni_intel snd_hda_core snd_pcm snd_timer cfg80211 ehci_pci xhci_pci drm_kms_helper syscopyarea sysfillrect sysimgblt fb_sys_fops drm xhci_hcd ehci_hcd asus_nb_wmi(-) asus_wmi sparse_keymap r8169 rfkill mxm_wmi serio_raw snd mii mei_me lpc_ich i2c_i801 video soundcore mei i2c_smbus wmi i2c_core mfd_core CPU: 3 PID: 3275 Comm: modprobe Not tainted 4.9.34-gentoo torvalds#34 Hardware name: ASUSTeK COMPUTER INC. K56CM/K56CM, BIOS K56CM.206 08/21/2012 task: ffff8801a639ba00 task.stack: ffffc900014cc000 RIP: 0010:[<ffffffff816c7348>] [<ffffffff816c7348>] __mutex_lock_slowpath+0x98/0x120 RSP: 0018:ffffc900014cfce0 EFLAGS: 00010282 RAX: 0000000000000000 RBX: ffff8801a54315b0 RCX: 00000000c0000100 RDX: 0000000000000001 RSI: 0000000000000000 RDI: ffff8801a54315b4 RBP: ffffc900014cfd30 R08: 0000000000000000 R09: 0000000000000002 R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801a54315b4 R13: ffff8801a639ba00 R14: 00000000ffffffff R15: ffff8801a54315b8 FS: 00007faa254fb700(0000) GS:ffff8801aef80000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 00000001a3b1b000 CR4: 00000000001406e0 Stack: ffff8801a54315b8 0000000000000000 ffffffff814733ae ffffc900014cfd28 ffffffff8146a28c ffff8801a54315b0 0000000000000000 ffff8801a54315b0 ffff8801a66f3820 0000000000000000 ffffc900014cfd48 ffffffff816c73e7 Call Trace: [<ffffffff814733ae>] ? acpi_ut_release_mutex+0x5d/0x61 [<ffffffff8146a28c>] ? acpi_ns_get_node+0x49/0x52 [<ffffffff816c73e7>] mutex_lock+0x17/0x30 [<ffffffffa00a3bb4>] asus_rfkill_hotplug+0x24/0x1a0 [asus_wmi] [<ffffffffa00a4421>] asus_wmi_rfkill_exit+0x61/0x150 [asus_wmi] [<ffffffffa00a49f1>] asus_wmi_remove+0x61/0xb0 [asus_wmi] [<ffffffff814a5128>] platform_drv_remove+0x28/0x40 [<ffffffff814a2901>] __device_release_driver+0xa1/0x160 [<ffffffff814a29e3>] device_release_driver+0x23/0x30 [<ffffffff814a1ffd>] bus_remove_device+0xfd/0x170 [<ffffffff8149e5a9>] device_del+0x139/0x270 [<ffffffff814a5028>] platform_device_del+0x28/0x90 [<ffffffff814a50a2>] platform_device_unregister+0x12/0x30 [<ffffffffa00a4209>] asus_wmi_unregister_driver+0x19/0x30 [asus_wmi] [<ffffffffa00da0ea>] asus_nb_wmi_exit+0x10/0xf26 [asus_nb_wmi] [<ffffffff8110c692>] SyS_delete_module+0x192/0x270 [<ffffffff810022b2>] ? exit_to_usermode_loop+0x92/0xa0 [<ffffffff816ca560>] entry_SYSCALL_64_fastpath+0x13/0x94 Code: e8 5e 30 00 00 8b 03 83 f8 01 0f 84 93 00 00 00 48 8b 43 10 4c 8d 7b 08 48 89 63 10 41 be ff ff ff ff 4c 89 3c 24 48 89 44 24 08 <48> 89 20 4c 89 6c 24 10 eb 1d 4c 89 e7 49 c7 45 08 02 00 00 00 RIP [<ffffffff816c7348>] __mutex_lock_slowpath+0x98/0x120 RSP <ffffc900014cfce0> CR2: 0000000000000000 ---[ end trace 8d484233fa7cb512 ]--- note: modprobe[3275] exited with preempt_count 2 https://bugzilla.kernel.org/show_bug.cgi?id=196467 Reported-by: red.f0xyz@gmail.com Signed-off-by: João Paulo Rechi Vita <jprvita@endlessm.com> Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>

With CONFIG_CC_STACKPROTECTOR enabled the kernel panics as below when parsing a NCSI_CMD_PKG_INFO command: [ 150.149711] Kernel panic - not syncing: stack-protector: Kernel stack is corrupted in: 805cff08 [ 150.149711] [ 150.159919] CPU: 0 PID: 1301 Comm: ncsi-netlink Not tainted 4.13.16-468cbec6d2c91239332cb91b1f0a73aafcb6f0c6 Ps3itaTeam#1 [ 150.170004] Hardware name: Generic DT based system [ 150.174852] [<80109930>] (unwind_backtrace) from [<80106bc4>] (show_stack+0x20/0x24) [ 150.182641] [<80106bc4>] (show_stack) from [<805d36e4>] (dump_stack+0x20/0x28) [ 150.189888] [<805d36e4>] (dump_stack) from [<801163ac>] (panic+0xdc/0x278) [ 150.196780] [<801163ac>] (panic) from [<801162cc>] (__stack_chk_fail+0x20/0x24) [ 150.204111] [<801162cc>] (__stack_chk_fail) from [<805cff08>] (ncsi_pkg_info_all_nl+0x244/0x258) [ 150.212912] [<805cff08>] (ncsi_pkg_info_all_nl) from [<804f939c>] (genl_lock_dumpit+0x3c/0x54) [ 150.221535] [<804f939c>] (genl_lock_dumpit) from [<804f873c>] (netlink_dump+0xf8/0x284) [ 150.229550] [<804f873c>] (netlink_dump) from [<804f8d44>] (__netlink_dump_start+0x124/0x17c) [ 150.237992] [<804f8d44>] (__netlink_dump_start) from [<804f9880>] (genl_rcv_msg+0x1c8/0x3d4) [ 150.246440] [<804f9880>] (genl_rcv_msg) from [<804f9174>] (netlink_rcv_skb+0xd8/0x134) [ 150.254361] [<804f9174>] (netlink_rcv_skb) from [<804f96a4>] (genl_rcv+0x30/0x44) [ 150.261850] [<804f96a4>] (genl_rcv) from [<804f7790>] (netlink_unicast+0x198/0x234) [ 150.269511] [<804f7790>] (netlink_unicast) from [<804f7ffc>] (netlink_sendmsg+0x368/0x3b0) [ 150.277783] [<804f7ffc>] (netlink_sendmsg) from [<804abea4>] (sock_sendmsg+0x24/0x34) [ 150.285625] [<804abea4>] (sock_sendmsg) from [<804ac1dc>] (___sys_sendmsg+0x244/0x260) [ 150.293556] [<804ac1dc>] (___sys_sendmsg) from [<804ad98c>] (__sys_sendmsg+0x5c/0x9c) [ 150.301400] [<804ad98c>] (__sys_sendmsg) from [<804ad9e4>] (SyS_sendmsg+0x18/0x1c) [ 150.308984] [<804ad9e4>] (SyS_sendmsg) from [<80102640>] (ret_fast_syscall+0x0/0x3c) [ 150.316743] ---[ end Kernel panic - not syncing: stack-protector: Kernel stack is corrupted in: 805cff08 This turns out to be because the attrs array in ncsi_pkg_info_all_nl() is initialised to a length of NCSI_ATTR_MAX which is the maximum attribute number, not the number of attributes. Fixes: 955dc68 ("net/ncsi: Add generic netlink family") Signed-off-by: Samuel Mendoza-Jonas <sam@mendozajonas.com> Signed-off-by: David S. Miller <davem@davemloft.net>

Modified config to support Docker.

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Modified config to support Docker. #1

Modified config to support Docker. #1

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Modified config to support Docker. #1

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Modified config to support Docker. #1

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barooney commented Feb 11, 2019

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