linux-kernel - Re: [syzbot] [bpf?] [net?] KASAN: slab-use-after-free Read in xsk_diag

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Date:   Tue, 29 Aug 2023 14:58:42 +0200
From:   Magnus Karlsson <magnus.karlsson@...il.com>
To:     Daniel Borkmann <daniel@...earbox.net>
Cc:     syzbot <syzbot+822d1359297e2694f873@...kaller.appspotmail.com>,
        andrii@...nel.org, ast@...nel.org, bjorn@...nel.org,
        bpf@...r.kernel.org, davem@...emloft.net, edumazet@...gle.com,
        hawk@...nel.org, john.fastabend@...il.com,
        jonathan.lemon@...il.com, kuba@...nel.org,
        linux-kernel@...r.kernel.org, maciej.fijalkowski@...el.com,
        magnus.karlsson@...el.com, netdev@...r.kernel.org,
        pabeni@...hat.com, syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [bpf?] [net?] KASAN: slab-use-after-free Read in xsk_diag_dump

On Tue, 29 Aug 2023 at 14:56, Daniel Borkmann <daniel@...earbox.net> wrote:
>
> Hi Magnus,
>
> On 8/29/23 10:20 AM, syzbot wrote:
> > Hello,
> >
> > syzbot found the following issue on:
> >
> > HEAD commit:    5c905279a1b7 Merge branch 'pds_core-error-handling-fixes'
> > git tree:       net
> > console+strace: https://syzkaller.appspot.com/x/log.txt?x=16080070680000
> > kernel config:  https://syzkaller.appspot.com/x/.config?x=1e4a882f77ed77bd
> > dashboard link: https://syzkaller.appspot.com/bug?extid=822d1359297e2694f873
> > compiler:       gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
> > syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=14ec63a7a80000
> > C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=109926eba80000
> >
> > Downloadable assets:
> > disk image: https://storage.googleapis.com/syzbot-assets/98add120b6e5/disk-5c905279.raw.xz
> > vmlinux: https://storage.googleapis.com/syzbot-assets/c9e9009eadbd/vmlinux-5c905279.xz
> > kernel image: https://storage.googleapis.com/syzbot-assets/b840142cc0c1/bzImage-5c905279.xz
> >
> > The issue was bisected to:
> >
> > commit 18b1ab7aa76bde181bdb1ab19a87fa9523c32f21
> > Author: Magnus Karlsson <magnus.karlsson@...el.com>
> > Date:   Mon Feb 28 09:45:52 2022 +0000
> >
> >      xsk: Fix race at socket teardown
>
> please take a look when you get a chance.
>
> Thanks a lot,
> Daniel

Already looking at it :-).

/Magnus