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

[Aili Yao]

On Fri, 5 Feb 2021 17:01:35 +0800
Aili Yao <yaoaili@xxxxxxxxxxxx> 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 <yangfeng1@xxxxxxxxxxxx>
> Signed-off-by: Aili Yao <yaoaili@xxxxxxxxxxxx>
> ---
>  arch/x86/mm/fault.c | 62 +++++++++++++++++++++++++++++----------------
>  1 file changed, 40 insertions(+), 22 deletions(-)
> 
Hi luto;
  Is there any feedback?

Thanks
Aili Yao