From: Adrian Cox <adrian@humboldt.co.uk>
To: Andrew Morton <akpm@zip.com.au>
Cc: linux-kernel@vger.kernel.org
Subject: Re: Filling holes in ext2
Date: Wed, 22 Aug 2001 19:59:57 +0100 [thread overview]
Message-ID: <3B84012D.1010303@humboldt.co.uk> (raw)
In-Reply-To: <3B83E9FD.6020801@humboldt.co.uk> <3B83FB3F.A0BDC056@zip.com.au>
Andrew Morton wrote:
> Adrian Cox wrote:
>>Can this actually be exploited? I assume the test on __copy_from_user()
>>is there in case another thread changes memory mappings while
>>generic_file_write() is running. My attempts to do this haven't yet
>>succeeded.
> I'd expect it to occur if you simply pass an unmapped address
> to write()?
No, because the first thing generic_file_write does is an access_ok()
check. It can only happen if the permissions change during the function.
That's why it's hard to exploit for real.
--
Adrian Cox http://www.humboldt.co.uk/
next prev parent reply other threads:[~2001-08-22 19:00 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-08-22 17:21 Filling holes in ext2 Adrian Cox
2001-08-22 18:34 ` Andrew Morton
2001-08-22 18:59 ` Adrian Cox [this message]
2001-08-23 17:22 ` Adrian Cox
2001-08-23 17:46 ` Andrew Morton
2001-08-23 19:17 ` Adrian Cox
2001-08-23 19:23 ` Alan Cox
2001-08-23 19:41 ` Andrew Morton
2001-08-23 21:21 ` Adrian Cox
2001-08-23 17:47 ` Alan Cox
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