linux-kernel - Re: [Stable-review] [07/55] SUNRPC: Fix a race between work-queue and rpc_killall

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:	Mon, 8 Aug 2011 10:03:00 -0700
From:	Greg KH <gregkh@...e.de>
To:	Ben Hutchings <ben@...adent.org.uk>
Cc:	linux-kernel@...r.kernel.org, stable@...nel.org,
	Trond Myklebust <Trond.Myklebust@...app.com>,
	akpm@...ux-foundation.org, torvalds@...ux-foundation.org,
	stable-review@...nel.org, alan@...rguk.ukuu.org.uk
Subject: Re: [Stable-review] [07/55] SUNRPC: Fix a race between work-queue
 and rpc_killall_tasks

On Sun, Aug 07, 2011 at 06:38:01PM +0100, Ben Hutchings wrote:
> On Fri, 2011-08-05 at 17:01 -0700, Greg KH wrote:
> > 2.6.32-longterm review patch.  If anyone has any objections, please let us know.
> > 
> > ------------------
> > 
> > From: Trond Myklebust <Trond.Myklebust@...app.com>
> > 
> > commit b55c59892e1f3b6c7d4b9ccffb4263e1486fb990 upstream.
> > 
> > Since rpc_killall_tasks may modify the rpc_task's tk_action field
> > without any locking, we need to be careful when dereferencing it.
> [...]
> 
> This isn't nearly careful enough to avoid races.  You must at least use
> the ACCESS_ONCE macro, otherwise the compiler can just optimise away the
> local variable this introduces.

Well, that's an upstream issue as well, right?  Not much I can do here
in the stable updates :)

greg k-h
--
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/