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

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Message-ID: <05A2E6E1-143B-4BAA-B346-320514E4477D@u.nus.edu>
Date: Wed, 23 Oct 2024 13:04:13 +0000
From: Ruan Bonan <bonan.ruan@...us.edu>
To: Jakub Sitnicki <jakub@...udflare.com>
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

Thanks for your reply and mailing suggestion. Sorry for the HTML format and I have changed my email client settings.

Bonan

On 2024/10/23, 20:51, "Jakub Sitnicki" <jakub@...udflare.com <mailto:jakub@...udflare.com>> wrote:


- External Email -






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/ <https://useplaintext.email/>


-jkbs