linux-kernel - Re: [PATCH] cgroup: Remove call to synchronize_rcu in cgroup_attach

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]

Date:	Tue, 23 Nov 2010 18:29:32 -0800
From:	Colin Cross <ccross@...roid.com>
To:	Paul Menage <menage@...gle.com>
Cc:	Colin Cross <ccross@...roid.com>, Li Zefan <lizf@...fujitsu.com>,
	containers@...ts.linux-foundation.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] cgroup: Remove call to synchronize_rcu in cgroup_attach_task

On Tue, Nov 23, 2010 at 5:43 PM, Colin Cross <ccross@...roid.com> wrote:
> This patch is similar to what you described.  The main differences are
> that I used a new atomic to handle the rmdir case, and I converted
> check_for_release to be callable in softirq context rather than schedule
> work in free_css_set_rcu.  Your css_set scanning in rmdir sounds better,
> I'll take another look at that.  Is there any problem with disabling irqs
> with spin_lock_irqsave in check_for_release?

free_css_set_rcu needs to take a write lock on css_set_lock to protect the
list_del(&link->cgrp_link_list).  I'll convert it to schedule work, and change
the spin_lock_irqsave back to spin_lock.
--
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/