linux-kernel - Re: [PATCH 1/2] fs/namespace: don't clobber mnt

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20140319212404.GA29059@swift.blarg.de>
Date:	Wed, 19 Mar 2014 22:24:04 +0100
From:	Max Kellermann <max@...mpel.org>
To:	viro@...iv.linux.org.uk, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] fs/namespace: don't clobber mnt_hash.next while
 umounting

On 2014/03/19 22:22, Max Kellermann <mk@...all.com> wrote:
> In the presence of user+mount namespaces, this bug can be exploited by
> any unprivileged user to stall the kernel (denial of service by soft
> lockup).

Proof-of-concept exploit attached.

View attachment "rcumount.c" of type "text/x-csrc" (1879 bytes)