linux-kernel - Re: [TOMOYO 05/15](repost) Domain transition handler functions.

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: <200710032259.HJF90663.OFMLOJtQHOFVSF@I-love.SAKURA.ne.jp>
Date:	Wed, 3 Oct 2007 22:59:22 +0900
From:	Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
To:	kaigai@...gai.gr.jp
Cc:	jmorris@...ei.org, linux-kernel@...r.kernel.org,
	linux-security-module@...r.kernel.org, chrisw@...s-sol.org
Subject: Re: [TOMOYO 05/15](repost) Domain transition handler functions.

Hello.

KaiGai Kohei wrote:
> If so, you can apply RCU instead to avoid read lock
> when scanning the list, like:
> 
> rcu_read_lock();
> list_for_each_entry(...) {
>      ....
> }
> rcu_read_unlock();

Can I sleep between rcu_read_lock() and rcu_read_unlock() ?
As far as I saw, rcu_read_lock() makes in_atomic() true, so I think I can't sleep.

If I use RCU, I have to give up " [TOMOYO 13/15] Conditional permission support"
because tmy_check_condition() can sleep.

Regards.

-
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/