linux-kernel - Re: [PATCH] task_work: add a scheduling point in task_work

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 for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <1345605221.2366.2.camel@falcor.watson.ibm.com>
Date:	Tue, 21 Aug 2012 23:13:41 -0400
From:	Mimi Zohar <zohar@...ux.vnet.ibm.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	Al Viro <viro@...IV.linux.org.uk>, Oleg Nesterov <oleg@...hat.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	". James Morris" <jmorris@...ei.org>,
	linux-security-module@...r.kernel.org,
	linux-kernel <linux-kernel@...r.kernel.org>,
	David Howells <dhowells@...hat.com>
Subject: Re: [PATCH] task_work: add a scheduling point in task_work_run()

On Tue, 2012-08-21 at 23:32 +0200, Eric Dumazet wrote:
> On Tue, 2012-08-21 at 16:37 -0400, Mimi Zohar wrote:
> 
> > We're here, because fput() called schedule_work() to delay the last
> > fput().  The execution needs to take place before the syscall returns to
> > userspace.  Need to read __schedule()...  Do you know if cond_resched()
> > can guarantee that it will be executed before the return to userspace? 
> 
> Some clarifications : 
> 
> - fput() does not call schedule_work() in this case but task_work_add()
> 
> - cond_resched() wont return to userspace.

Thanks for the clarification.

Mimi

--
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/