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
next 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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