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Date: Sat, 9 Jun 2007 16:15:21 +0100 From: Al Viro <viro@....linux.org.uk> To: Ulrich Drepper <drepper@...hat.com> Cc: Linus Torvalds <torvalds@...ux-foundation.org>, Davide Libenzi <davidel@...ilserver.org>, Alan Cox <alan@...rguk.ukuu.org.uk>, Theodore Tso <tytso@....edu>, Eric Dumazet <dada1@...mosbay.com>, Kyle Moffett <mrmacman_g4@....com>, Linux Kernel Mailing List <linux-kernel@...r.kernel.org>, Andrew Morton <akpm@...ux-foundation.org>, Ingo Molnar <mingo@...e.hu> Subject: Re: [patch 7/8] fdmap v2 - implement sys_socket2 On Fri, Jun 08, 2007 at 07:10:03PM -0700, Ulrich Drepper wrote: > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA1 > > Al Viro wrote: > > Any real-world examples of exploitable holes based on that? > > Return to libc exploit, calling dup2, where some privileged data is > redirected from the normal file descriptor to one of the attackers > choosing. The latter could be an outgoing socket connection which would > result in leaking the data to the outside. > > normal code intruder > > so = socket() > > fd = open ("local-file") > > dup2(so, fd); > > write (fd, privileged data) > > > It's just a little function call. If the arguments of dup2() are known > this is not a big issue to construct. So which code is supposed to do that open/write in your example? Library? Unmodified application? Application specifically modified to make *that* open() randomized? - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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