Re: [PATCH v3] x86/fault: Send a SIGBUS to user process always for hwpoison page access.

On Fri, 5 Feb 2021 17:01:35 +0800
Aili Yao [off-list ref] wrote:

When one page is already hwpoisoned by MCE AO action, processes may not
be killed, processes mapping this page may make a syscall include this
page and result to trigger a VM_FAULT_HWPOISON fault, as it's in kernel
mode it may be fixed by fixup_exception, current code will just return
error code to user code.

This is not sufficient, we should send a SIGBUS to the process and log
the info to console, as we can't trust the process will handle the error
correctly.

Suggested-by: Feng Yang <redacted>
Signed-off-by: Aili Yao <redacted>
---
 arch/x86/mm/fault.c | 62 +++++++++++++++++++++++++++++----------------
 1 file changed, 40 insertions(+), 22 deletions(-)

Hi luto;
  Is there any feedback?

Thanks
Aili Yao