lkml.org 
[lkml]   [2020]   [Aug]   [25]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
Date
SubjectRe: [PATCH v3 0/6] kasan: add workqueue and timer stack for generic KASAN
On Tue, 25 Aug 2020 at 03:57, Walter Wu <walter-zh.wu@mediatek.com> wrote:
>
> Syzbot reports many UAF issues for workqueue or timer, see [1] and [2].
> In some of these access/allocation happened in process_one_work(),
> we see the free stack is useless in KASAN report, it doesn't help
> programmers to solve UAF on workqueue. The same may stand for times.
>
> This patchset improves KASAN reports by making them to have workqueue
> queueing stack and timer stack information. It is useful for programmers
> to solve use-after-free or double-free memory issue.
>
> Generic KASAN also records the last two workqueue and timer stacks and
> prints them in KASAN report. It is only suitable for generic KASAN.
>
> [1]https://groups.google.com/g/syzkaller-bugs/search?q=%22use-after-free%22+process_one_work
> [2]https://groups.google.com/g/syzkaller-bugs/search?q=%22use-after-free%22%20expire_timers
> [3]https://bugzilla.kernel.org/show_bug.cgi?id=198437
>
> Walter Wu (6):
> timer: kasan: record timer stack
> workqueue: kasan: record workqueue stack
> kasan: print timer and workqueue stack
> lib/test_kasan.c: add timer test case
> lib/test_kasan.c: add workqueue test case
> kasan: update documentation for generic kasan

Acked-by: Marco Elver <elver@google.com>



> ---
>
> Changes since v2:
> - modify kasan document to be more readable.
> Thanks for Marco suggestion.
>
> Changes since v1:
> - Thanks for Marco and Thomas suggestion.
> - Remove unnecessary code and fix commit log
> - reuse kasan_record_aux_stack() and aux_stack
> to record timer and workqueue stack.
> - change the aux stack title for common name.
>
> ---
>
> Documentation/dev-tools/kasan.rst | 4 ++--
> kernel/time/timer.c | 3 +++
> kernel/workqueue.c | 3 +++
> lib/test_kasan.c | 54 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
> mm/kasan/report.c | 4 ++--
> 5 files changed, 64 insertions(+), 4 deletions(-)
>
> --
> You received this message because you are subscribed to the Google Groups "kasan-dev" group.
> To unsubscribe from this group and stop receiving emails from it, send an email to kasan-dev+unsubscribe@googlegroups.com.
> To view this discussion on the web visit https://groups.google.com/d/msgid/kasan-dev/20200825015654.27781-1-walter-zh.wu%40mediatek.com.

\
 
 \ /
  Last update: 2020-08-25 10:27    [W:0.221 / U:0.112 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site