From: Paul Pluzhnikov <ppluzhnikov@google.com>
To: Paul Pluzhnikov <ppluzhnikov@google.com>,
gdb-patches@sourceware.org,
Pedro Alves <pedro@codesourcery.com>,
Ulrich Weigand <uweigand@de.ibm.com>
Subject: Re: RFC: Longjmp vs LD_POINTER_GUARD revisited
Date: Sun, 15 Nov 2009 23:06:00 -0000 [thread overview]
Message-ID: <8ac60eac0911151505s6834e781wf6887f0641345db@mail.gmail.com> (raw)
In-Reply-To: <20091115223539.GA23336@caradoc.them.org>
On Sun, Nov 15, 2009 at 2:35 PM, Daniel Jacobowitz <drow@false.org> wrote:
> There's a rotate and an xor involved; I don't believe this would work
> as written... sure, we could "discover" it from disassembling key
> functions automatically...
Oh, right. There was "plain XOR" in FC6, and shift-by-9 added in FC7.
Still it's trivial to discover the canary without disassembling
anything (disassembling requires symbols, which may be stripped):
there are only 3 different algorithms I've seen (no canary, XOR,
XOR+shift-by-9). Hmm, looks like x86_64 has XOR+shift-by-17 now, but
ia64, SPARC and PPC all have just "plain XOR".
Still I think this may be a more robust then requiring debuginfo or
non-stripped glibc.
--
Paul Pluzhnikov
next prev parent reply other threads:[~2009-11-15 23:06 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-11-15 17:35 Daniel Jacobowitz
2009-11-15 18:06 ` Eli Zaretskii
2009-11-15 18:30 ` Paul Pluzhnikov
2009-11-15 22:36 ` Daniel Jacobowitz
2009-11-15 23:06 ` Paul Pluzhnikov [this message]
2009-11-16 14:37 ` Daniel Jacobowitz
2009-11-16 14:55 ` Pedro Alves
2009-11-16 14:56 ` Pedro Alves
2009-11-16 15:05 ` Pedro Alves
2009-11-16 17:50 ` Daniel Jacobowitz
2009-11-15 18:39 ` Joseph S. Myers
2009-11-15 21:52 ` Mark Kettenis
2009-11-15 22:37 ` Daniel Jacobowitz
2009-11-16 15:15 ` Frank Ch. Eigler
2009-11-16 15:40 ` Paul Pluzhnikov
2009-11-16 15:43 ` Paul Pluzhnikov
2009-11-16 16:19 ` Mark Kettenis
2009-11-16 15:59 ` Mark Kettenis
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