linux-kernel - Re: [PATCH] fanotify: Do check against max_marks and increase number of group marks atomically

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Date:	Tue, 09 Nov 2010 15:21:45 -0500
From:	Eric Paris <eparis@...hat.com>
To:	Lino Sanfilippo <LinoSanfilippo@....de>
Cc:	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH] fanotify: Do check against max_marks and increase
 number of group marks atomically

On Tue, 2010-11-09 at 19:19 +0100, Lino Sanfilippo wrote:
> The number of group marks is checked against max_marks and increased afterwards
>     in a non atomic way. This may result in 2 or more processes passing the check
>     at the same time and increasing the number of group marks above the max_marks
>     limit afterwards.
>     With this patch the check against max_marks is done in fsnotify_add_mark(),
>     after the group lock has been aquired to ensure that concurrent processes
>     cant exceed the group marks limit.
> 
> Signed-off-by: Lino Sanfilippo <LinoSanfilippo@....de>

applied to http://git.infradead.org/users/eparis/notify.git/ #for-next

-Eric

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