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From: Ingo Molnar <mingo@redhat.com>
To: linux-kernel@vger.kernel.org
Cc: Andi Kleen <ak@suse.de>
Subject: Re: [Announcement] "Exec Shield", new Linux security feature
Date: Mon, 5 May 2003 03:14:50 -0400 (EDT)	[thread overview]
Message-ID: <Pine.LNX.4.44.0305050314240.26441-100000@devserv.devel.redhat.com> (raw)


On 4 May 2003, Andi Kleen wrote:

> Ingo Molnar <mingo@redhat.com> writes:
> 
> > ie. if the binary anywhere has code that does:
> > 
> > 	system("/bin/sh")
> 
> You just need system(char *arg) { ... } (= in every libc). Then put
> /bin/sh somewhere and a pointer to it on the stack as argument and
> overwrite some return address on the stack to jump to it.

well, how do you put the pointer on the stack if your only way to get into
the ASCII-area is to stop the overflow early and use the final \0 ? [and
the parameter has to be put _after_ the enclosing \0. ] It's not 100%
impossible, but in the common case looks quite unlikely.

	Ingo


             reply	other threads:[~2003-05-05  7:02 UTC|newest]

Thread overview: 48+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2003-05-05  7:14 Ingo Molnar [this message]
  -- strict thread matches above, loose matches on Subject: below --
2003-05-04 23:55 [Announcement] "Exec Shield", new Linux security feature Chuck Ebbert
2003-05-05  3:14 ` H. Peter Anvin
2003-05-04 16:20 Yoav Weiss
     [not found] <Pine.LNX.4.44.0305040404300.12757-100000@devserv.devel.redhat.com.suse.lists.linux.kernel>
     [not found] ` <Pine.LNX.4.44.0305040448250.24497-100000@devserv.devel.redhat.com.suse.lists.linux.kernel>
2003-05-04 15:48   ` Andi Kleen
2003-05-04 14:25 Chuck Ebbert
2003-05-04 22:22 ` Richard Henderson
2003-05-05  0:41   ` H. Peter Anvin
2003-05-04 11:19 Yoav Weiss
2003-05-04 13:51 ` Ingo Molnar
2003-05-03 13:19 linux
2003-05-03 23:00 ` Valdis.Kletnieks
2003-05-04  7:03   ` Calin A. Culianu
2003-05-04  8:49     ` Arjan van de Ven
2003-05-05 13:35     ` Jesse Pollard
2003-05-04 15:24   ` linux
2003-05-02 22:46 Chuck Ebbert
     [not found] <Pine.LNX.4.44.0305021325130.6565-100000@devserv.devel.redhat.com.suse.lists.linux.kernel>
     [not found] ` <200305021829.h42ITclA000178@81-2-122-30.bradfords.org.uk.suse.lists.linux.kernel>
     [not found]   ` <b8udjm$cgq$1@cesium.transmeta.com.suse.lists.linux.kernel>
2003-05-02 20:51     ` Andi Kleen
2003-05-02 20:56       ` H. Peter Anvin
2003-05-02 21:07         ` Andi Kleen
2003-05-02 21:09           ` H. Peter Anvin
2003-05-02 21:25             ` Andi Kleen
2003-05-02 16:37 Ingo Molnar
2003-05-02 17:05 ` Matthias Andree
2003-05-02 17:12   ` Marc-Christian Petersen
2003-05-02 17:12 ` Davide Libenzi
2003-05-02 17:18   ` Arjan van de Ven
2003-05-02 17:32     ` Ingo Molnar
2003-05-02 18:29       ` John Bradford
2003-05-02 18:32         ` H. Peter Anvin
2003-05-02 19:09         ` David Mosberger
2003-05-02 18:51       ` Davide Libenzi
     [not found]   ` <20030502172011$0947@gated-at.bofh.it>
2003-05-02 18:17     ` Florian Weimer
2003-05-02 18:29       ` Davide Libenzi
2003-05-02 18:32         ` Florian Weimer
2003-05-02 18:50           ` Davide Libenzi
2003-05-02 21:48 ` Carl-Daniel Hailfinger
2003-05-03  6:52   ` Ingo Molnar
2003-05-03  9:56     ` Carl-Daniel Hailfinger
2003-05-03 12:48       ` Arjan van de Ven
2003-05-04  6:52     ` Calin A. Culianu
2003-05-04  8:10       ` Ingo Molnar
2003-05-04  8:52         ` Ingo Molnar
2003-05-04 15:40           ` Calin A. Culianu
2003-05-04 15:48             ` Sean Neakums
2003-05-04 15:23         ` Calin A. Culianu
2003-05-04 20:07       ` H. Peter Anvin
2003-05-04 20:57 ` Kasper Dupont

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