linux-kernel - Re: [PATCH] gen_init_cpio: Avoid race between call to stat() and call to open()

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Message-ID: <4D151FCC.4060202@pobox.com>
Date:	Fri, 24 Dec 2010 17:33:48 -0500
From:	Jeff Garzik <jgarzik@...ox.com>
To:	Jesper Juhl <jj@...osbits.net>
CC:	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH] gen_init_cpio: Avoid race between call to stat() and
 call to open()

On 12/24/2010 03:28 PM, Jesper Juhl wrote:
> Hi,
>
> In usr/gen_init_cpio.c::cpio_mkfile() a call to stat() is made based on
> pathname, subsequently the file is open()'ed and then the value of the
> initial stat() call is used to allocate a buffer. This is not safe since
> the file may change between the call to stat() and the call to open().
> Safer to just open() the file and then do fstat() using the filedescriptor
> returned by open.
>
>
> Signed-off-by: Jesper Juhl<jj@...osbits.net>

Acked-by: Jeff Garzik <jgarzik@...hat.com>


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