linux-kernel - Re: KASAN: slab-out-of-bounds Read in cgroup_file

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Date:   Thu, 12 Mar 2020 14:28:26 -0400
From:   Tejun Heo <tj@...nel.org>
To:     almasrymina@...gle.com,
        syzbot <syzbot+cac0c4e204952cf449b1@...kaller.appspotmail.com>
Cc:     akpm@...ux-foundation.org, andriin@...com, ast@...nel.org,
        bpf@...r.kernel.org, cgroups@...r.kernel.org, christian@...uner.io,
        daniel@...earbox.net, hannes@...xchg.org, kafai@...com,
        linux-kernel@...r.kernel.org, lizefan@...wei.com,
        netdev@...r.kernel.org, sfr@...b.auug.org.au,
        songliubraving@...com, syzkaller-bugs@...glegroups.com, yhs@...com
Subject: Re: KASAN: slab-out-of-bounds Read in cgroup_file_notify

On Tue, Mar 10, 2020 at 08:55:14AM -0700, syzbot wrote:
> Hello,
> 
> syzbot found the following crash on:
> 
> HEAD commit:    c99b17ac Add linux-next specific files for 20200225
> git tree:       linux-next
> console output: https://syzkaller.appspot.com/x/log.txt?x=1610d70de00000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=6b7ebe4bd0931c45
> dashboard link: https://syzkaller.appspot.com/bug?extid=cac0c4e204952cf449b1
> compiler:       gcc (GCC) 9.0.0 20181231 (experimental)
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=1242e1fde00000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=1110d70de00000
> 
> The bug was bisected to:
> 
> commit 6863de00e5400b534cd4e3869ffbc8f94da41dfc
> Author: Mina Almasry <almasrymina@...gle.com>
> Date:   Thu Feb 20 03:55:30 2020 +0000
> 
>     hugetlb_cgroup: add accounting for shared mappings

Mina, can you please take a look at this?

Thanks.

-- 
tejun