linux-kernel - Re: [syzbot] KASAN: slab-out-of-bounds Write in dbgfs_rm_context

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Date:   Mon, 31 Oct 2022 18:30:30 +0000
From:   SeongJae Park <sj@...nel.org>
To:     syzbot <syzbot+6087eafb76a94c4ac9eb@...kaller.appspotmail.com>
Cc:     akpm@...ux-foundation.org, damon@...ts.linux.dev,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org, sj@...nel.org,
        syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] KASAN: slab-out-of-bounds Write in dbgfs_rm_context_write

Hello,

On Sun, 30 Oct 2022 18:44:35 -0700 syzbot <syzbot+6087eafb76a94c4ac9eb@...kaller.appspotmail.com> wrote:

> Hello,
> 
> syzbot found the following issue on:
> 
> HEAD commit:    98555239e4c3 Merge tag 'arc-6.1-fixes' of git://git.kernel..
> git tree:       upstream
> console+strace: https://syzkaller.appspot.com/x/log.txt?x=12508922880000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=a66c6c673fb555e8
> dashboard link: https://syzkaller.appspot.com/bug?extid=6087eafb76a94c4ac9eb
> compiler:       gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=167e3f4a880000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=1262cb86880000
> 
> Downloadable assets:
> disk image: https://storage.googleapis.com/syzbot-assets/b9ab8f713204/disk-98555239.raw.xz
> vmlinux: https://storage.googleapis.com/syzbot-assets/5efa1b178038/vmlinux-98555239.xz
> kernel image: https://storage.googleapis.com/syzbot-assets/83329b87f1a8/bzImage-98555239.xz
> 
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+6087eafb76a94c4ac9eb@...kaller.appspotmail.com
> 
> general protection fault, probably for non-canonical address 0xdffffc0000000002: 0000 [#1] PREEMPT SMP KASAN
> KASAN: null-ptr-deref in range [0x0000000000000010-0x0000000000000017]
> CPU: 1 PID: 3603 Comm: syz-executor414 Not tainted 6.1.0-rc2-syzkaller-00078-g98555239e4c3 #0
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/11/2022
> RIP: 0010:dbgfs_rm_context mm/damon/dbgfs.c:928 [inline]
> RIP: 0010:dbgfs_rm_context_write+0x2e3/0x4d0 mm/damon/dbgfs.c:971

Thank you for this report.  I just posted a patchset[1] for the fix and
selftest repro of this bug.

[1] https://lore.kernel.org/damon/20221031182554.7882-1-sj@kernel.org/

Thanks,
SJ

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