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

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Message-ID: <3d8fa470-8ca9-561c-8381-0687f9e69d10@iogearbox.net>
Date:   Tue, 29 Aug 2023 14:56:06 +0200
From:   Daniel Borkmann <daniel@...earbox.net>
To:     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

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