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

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Message-ID: <CAHS8izPySSO07dHi3OZ_1uXjmMCGnNMWey+o-qwFM7GnD7oSHw@mail.gmail.com>
Date:   Thu, 12 Mar 2020 14:06:47 -0700
From:   Mina Almasry <almasrymina@...gle.com>
To:     Tejun Heo <tj@...nel.org>
Cc:     syzbot <syzbot+cac0c4e204952cf449b1@...kaller.appspotmail.com>,
        Andrew Morton <akpm@...ux-foundation.org>, andriin@...com,
        ast@...nel.org, bpf@...r.kernel.org, cgroups@...r.kernel.org,
        christian@...uner.io, daniel@...earbox.net,
        Johannes Weiner <hannes@...xchg.org>, kafai@...com,
        open list <linux-kernel@...r.kernel.org>,
        Li Zefan <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 Thu, Mar 12, 2020 at 11:28 AM Tejun Heo <tj@...nel.org> wrote:
>
> 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?
>

Gah, I missed the original syzbot email but I just saw this. I'll take a look.

> Thanks.

>
> --
> tejun