From: Catalin Marinas <catalin.marinas@arm.com>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org,
Andy Lutomirski <luto@kernel.org>, CAI Qian <caiqian@redhat.com>
Subject: Re: [PATCH] mm: kmemleak: Ensure that the task stack is not freed during scanning
Date: Thu, 20 Oct 2016 11:02:34 +0100 [thread overview]
Message-ID: <20161020100234.GD23600@e104818-lin.cambridge.arm.com> (raw)
In-Reply-To: <20161019113327.3e796893d89333f6ebe65d79@linux-foundation.org>
Hi Andrew,
On Wed, Oct 19, 2016 at 11:33:27AM -0700, Andrew Morton wrote:
> On Wed, 12 Oct 2016 10:57:03 +0100 Catalin Marinas <catalin.marinas@arm.com> wrote:
> > Commit 68f24b08ee89 ("sched/core: Free the stack early if
> > CONFIG_THREAD_INFO_IN_TASK") may cause the task->stack to be freed
> > during kmemleak_scan() execution, leading to either a NULL pointer
> > fault (if task->stack is NULL) or kmemleak accessing already freed
> > memory. This patch uses the new try_get_task_stack() API to ensure that
> > the task stack is not freed during kmemleak stack scanning.
> >
> > Fixes: 68f24b08ee89 ("sched/core: Free the stack early if CONFIG_THREAD_INFO_IN_TASK")
> > Cc: Andrew Morton <akpm@linux-foundation.org>
> > Cc: Andy Lutomirski <luto@kernel.org>
> > Cc: CAI Qian <caiqian@redhat.com>
> > Reported-by: CAI Qian <caiqian@redhat.com>
> > Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
>
> I'll add
>
> Cc: <stable@vger.kernel.org> [4.8.x]
This should be 4.9.x. The commit that introduces try_get_task_stack()
was merged in 4.9-rc1: c6c314a613cd ("sched/core: Add
try_get_task_stack() and put_task_stack()").
--
Catalin
--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org. For more info on Linux MM,
see: http://www.linux-mm.org/ .
Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>
prev parent reply other threads:[~2016-10-20 10:02 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-10-12 9:57 [PATCH] mm: kmemleak: Ensure that the task stack is not freed during scanning Catalin Marinas
2016-10-12 10:16 ` Hillf Danton
2016-10-12 10:47 ` Catalin Marinas
2016-10-12 10:41 ` Michal Hocko
2016-10-12 15:54 ` CAI Qian
2016-10-12 16:14 ` Catalin Marinas
2016-10-19 18:33 ` Andrew Morton
2016-10-20 10:02 ` Catalin Marinas [this message]
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20161020100234.GD23600@e104818-lin.cambridge.arm.com \
--to=catalin.marinas@arm.com \
--cc=akpm@linux-foundation.org \
--cc=caiqian@redhat.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=luto@kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).