linux-kernel - Re: [PATCH] ftrace: do_each_pid

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: <20090203215123.GA12123@elte.hu>
Date:	Tue, 3 Feb 2009 22:51:23 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	Steven Rostedt <srostedt@...hat.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ftrace: do_each_pid_task() needs rcu lock


* Oleg Nesterov <oleg@...hat.com> wrote:

> "ftrace: use struct pid" commit 978f3a45d9499c7a447ca7615455cefb63d44165
> converted ftrace_pid_trace to "struct pid*". But we can't use
> do_each_pid_task() without rcu_read_lock() even if we know the pid
> itself can't go away (it was pinned in ftrace_pid_write). The exiting
> task can detach itself from this pid at any moment.
> 
> Signed-off-by: Oleg Nesterov <oleg@...hat.com>

Applied to tip/tracing/urgent (for v2.6.29), thanks Oleg!

	Ingo
--
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/