linux-kernel - Re: [PATCH 1/3] mm/memory-failure: try to send SIGBUS even if unmap failed

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <1bc8c5ff-1452-11d3-edee-9f45a87015a9@huawei.com>
Date: Wed, 8 May 2024 15:47:54 +0800
From: Miaohe Lin <linmiaohe@...wei.com>
To: Jane Chu <jane.chu@...cle.com>, <nao.horiguchi@...il.com>,
	<akpm@...ux-foundation.org>, <linux-mm@...ck.org>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/3] mm/memory-failure: try to send SIGBUS even if unmap
 failed

On 2024/5/2 7:24, Jane Chu wrote:
> For years when it comes down to kill a process due to hwpoison,
> a SIGBUS is delivered only if unmap has been successful.
> Otherwise, a SIGKILL is delivered. And the reason for that is
> to prevent the involved process from accessing the hwpoisoned
> page again.
> 
> Since then a lot has changed, a hwpoisoned page is marked and
> upon being re-accessed, the process will be killed immediately.
> So let's take out the '!unmap_success' factor and try to deliver
> SIGBUS if possible.
> 
> Signed-off-by: Jane Chu <jane.chu@...cle.com>
> ---
>  mm/memory-failure.c | 13 ++++---------
>  1 file changed, 4 insertions(+), 9 deletions(-)
> 
> diff --git a/mm/memory-failure.c b/mm/memory-failure.c
> index 9e62a00b46dd..7fcf182abb96 100644
> --- a/mm/memory-failure.c
> +++ b/mm/memory-failure.c
> @@ -519,19 +519,14 @@ void add_to_kill_ksm(struct task_struct *tsk, struct page *p,
>   * Also when FAIL is set do a force kill because something went
>   * wrong earlier.

Since @fail is removed, above comment should be removed too.
Thanks.
.