linux-kernel - Re: [PATCH -mm 3/4][AIO] - AIO completion signal notification

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: <20061123004053.76114a75.akpm@osdl.org>
Date:	Thu, 23 Nov 2006 00:40:53 -0800
From:	Andrew Morton <akpm@...l.org>
To:	Sébastien Dugué <sebastien.dugue@...l.net>
Cc:	linux-kernel <linux-kernel@...r.kernel.org>,
	linux-aio <linux-aio@...ck.org>,
	Suparna Bhattacharya <suparna@...ibm.com>,
	Christoph Hellwig <hch@...radead.org>,
	Zach Brown <zach.brown@...cle.com>,
	Badari Pulavarty <pbadari@...ibm.com>,
	Jean Pierre Dion <jean-pierre.dion@...l.net>,
	Ulrich Drepper <drepper@...hat.com>
Subject: Re: [PATCH -mm 3/4][AIO] - AIO completion signal notification

On Thu, 23 Nov 2006 09:28:05 +0100
Sébastien Dugué <sebastien.dugue@...l.net> wrote:

> > > +	if (notify->notify == (SIGEV_SIGNAL|SIGEV_THREAD_ID)) {
> > > +		/*
> > > +		 * This reference will be dropped in really_put_req() when
> > > +		 * we're done with the request.
> > > +		 */
> > > +		get_task_struct(target);
> > > +	}
> > 
> > It worries me that this function can save away a task_struct* without
> > having taken a reference against it.
> > 
> 
>   OK. Does moving 'notify->target = target;' after the get_task_struct() will
> do, or am I missing something more subtle?

Well it's your code - you tell me ;)

It is unsafe (and rather pointless) to be saving the address of some structure
which can be freed at any time.
-
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/