From: Scott Robert Ladd <coyote@coyotegulch.com>
To: Larry McVoy <lm@bitmover.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: BK2CVS problem
Date: Wed, 05 Nov 2003 23:09:24 -0500 [thread overview]
Message-ID: <3FA9C974.3010002@coyotegulch.com> (raw)
In-Reply-To: <20031105230350.GB12992@work.bitmover.com>
Larry McVoy wrote:
> On Wed, Nov 05, 2003 at 04:48:09PM -0600, Chad Kitching wrote:
>
>>From: Zwane Mwaikambo
>>
>>>>+ if ((options == (__WCLONE|__WALL)) && (current->uid = 0))
>>>>+ retval = -EINVAL;
>>>
>>>That looks odd
>>>
>>
>>Setting current->uid to zero when options __WCLONE and __WALL are set? The
>>retval is dead code because of the next line, but it looks like an attempt
>>to backdoor the kernel, does it not?
>
>
> It sure does. Note "current->uid = 0", not "current->uid == 0".
> Good eyes, I missed that. This function is sys_wait4() so by passing in
> __WCLONE|__WALL you are root. How nice.
In other words, the theoretical exploit was inserted by someone clever.
Do we have any idea who?
BTW, good job catching the problem Larry.
--
Scott Robert Ladd
Coyote Gulch Productions (http://www.coyotegulch.com)
Software Invention for High-Performance Computing
next prev parent reply other threads:[~2003-11-06 4:10 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-11-05 22:48 BK2CVS problem Chad Kitching
2003-11-05 22:53 ` Zwane Mwaikambo
2003-11-05 23:03 ` Larry McVoy
2003-11-06 0:52 ` Tomas Szepe
2003-11-06 1:57 ` Andreas Dilger
2003-11-06 2:20 ` Linus Torvalds
2003-11-06 3:01 ` Larry McVoy
2003-11-06 10:40 ` Matthias Andree
2003-11-06 4:09 ` Scott Robert Ladd [this message]
2003-11-06 10:06 ` bert hubert
2003-11-06 13:22 ` Theodore Ts'o
2003-11-06 14:43 ` Rik van Riel
2003-11-06 15:56 ` Linus Torvalds
-- strict thread matches above, loose matches on Subject: below --
2003-11-05 20:45 Larry McVoy
2003-11-05 20:58 ` Matthew Dharm
2003-11-05 22:23 ` Larry McVoy
2003-11-05 22:33 ` Zwane Mwaikambo
2003-11-05 22:51 ` Andries Brouwer
2003-11-06 7:07 ` Brian McGroarty
2003-11-06 11:41 ` Andrew Walrond
2003-11-06 12:02 ` nosp
2003-11-06 12:02 ` Xavier Bestel
2003-11-06 13:27 ` Scott Robert Ladd
2003-11-06 13:59 ` Richard B. Johnson
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