linux-kernel - Re: [BUG] general protection fault in sock_map_link_update_prog

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Message-ID: <877c9z9e3x.fsf@cloudflare.com>
Date: Wed, 23 Oct 2024 14:51:30 +0200
From: Jakub Sitnicki <jakub@...udflare.com>
To: Ruan Bonan <bonan.ruan@...us.edu>
Cc: "john.fastabend@...il.com" <john.fastabend@...il.com>,
  "davem@...emloft.net" <davem@...emloft.net>,  "edumazet@...gle.com"
 <edumazet@...gle.com>,  "kuba@...nel.org" <kuba@...nel.org>,
  "pabeni@...hat.com" <pabeni@...hat.com>,  "netdev@...r.kernel.org"
 <netdev@...r.kernel.org>,  "bpf@...r.kernel.org" <bpf@...r.kernel.org>,
  "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
  "syzkaller@...glegroups.com" <syzkaller@...glegroups.com>
Subject: Re: [BUG] general protection fault in sock_map_link_update_prog -
 Reproducible with Syzkaller

On Tue, Oct 22, 2024 at 02:36 AM GMT, Ruan Bonan wrote:
> I used Syzkaller and found that there is KASAN: null-ptr-deref (general protection fault in
> sock_map_link_update_prog) in net/core/sock_map.c in v6.12.0-rc2, which also causes a KASAN:
> slab-use-after-free at the same time. It looks like a concurrency bug in the BPF related subsystems. The
> reproducer is available, and I have reproduced this bug with it manually. Currently I can only reproduce this
> bug with root privilege.
>
> The detailed reports, config file, and reproducer program are attached in this e-mail. If you need further
> details, please let me know.

Thanks for the report. I was also able to reproduce the KASAN splat with
the attached repro locally and will investigate futher.

I have a small ask - please use plain text for mailing the list in the
future - https://useplaintext.email/

-jkbs