linux-kernel - Re: namespaces?: bug at mm/slub.c:2750

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: <2532.1234375381@redhat.com>
Date:	Wed, 11 Feb 2009 18:03:01 +0000
From:	David Howells <dhowells@...hat.com>
To:	"Serge E. Hallyn" <serue@...ibm.com>
Cc:	dhowells@...hat.com, Vegard Nossum <vegard.nossum@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Eric Sesterhenn <snakebyte@....de>, containers@...ts.osdl.org,
	linux-kernel@...r.kernel.org,
	Dhaval Giani <dhaval@...ux.vnet.ibm.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: namespaces?: bug at mm/slub.c:2750

Serge E. Hallyn <serue@...ibm.com> wrote:

> It's called under uidhash_lock spinlock so should be ok, but in
> principle you're right so it's probably a good idea.

The lock is nothing to do with it.  put_user_ns() may call kfree() on the
user_namespace, but the user_struct given to uid_hash_remove() may still be
attached to it.

David
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/