linux-kernel - Re: [PATCH 1/3] signals: fix sigqueue_free() vs __exit

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: <20080519233330.b594783a.akpm@linux-foundation.org>
Date:	Mon, 19 May 2008 23:33:30 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Oleg Nesterov <oleg@...sign.ru>
Cc:	Roland McGrath <roland@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] signals: fix sigqueue_free() vs __exit_signal()
 race

On Sat, 17 May 2008 19:14:18 +0400 Oleg Nesterov <oleg@...sign.ru> wrote:

> __exit_signal() does flush_sigqueue(tsk->pending) outside of ->siglock.
> This can race with another thread doing sigqueue_free(), we can free
> the same SIGQUEUE_PREALLOC sigqueue twice or corrupt the pending->list.
> 
> Note that even sys_exit_group() can trigger this race, not only
> sys_timer_delete().
> 
> Move the callsite of flush_sigqueue(tsk->pending) under ->siglock.
> 
> This patch doesn't touch flush_sigqueue(->shared_pending) below, it is
> called when there are no other threads which can play with signals,
> and sigqueue_free() can't be used outside of our thread group.

afacit this is the only needed-in-2.6.26 patch from these two
three-patch series, yes?
--
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/