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Add some log to print which is the badframe entrance #118

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Add some log to print which is the badframe entrance #118

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18 changes: 15 additions & 3 deletions arch/x86/kernel/signal.c
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Original file line number Diff line number Diff line change
Expand Up @@ -663,20 +663,32 @@ SYSCALL_DEFINE0(rt_sigreturn)

frame = (struct rt_sigframe __user *)(regs->sp - sizeof(long));
if (!access_ok(frame, sizeof(*frame)))
{
pr_info("IBT.rt_sigreturn frame: %px\n", frame);
goto badframe;
}
if (__get_user(*(__u64 *)&set, (__u64 __user *)&frame->uc.uc_sigmask))
{
pr_info("IBT.rt_sigreturn __get_user(*(__u64 *)&set, (__u64 __user *)&frame->uc.uc_sigmask)");
goto badframe;
}
if (__get_user(uc_flags, &frame->uc.uc_flags))
{
pr_info("IBT.rt_sigreturn __get_user(uc_flags, &frame->uc.uc_flags)");
goto badframe;

}
set_current_blocked(&set);

if (restore_sigcontext(regs, &frame->uc.uc_mcontext, uc_flags))
{
pr_info("IBT.restore_sigcontext 1 uc_flags %lu\n", (unsigned long)uc_flags);
goto badframe;

}
if (restore_altstack(&frame->uc.uc_stack))
{
pr_info("IBT.restore_sigcontext 2");
goto badframe;

}
return regs->ax;

badframe:
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