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Re: [PATCH v2] libio: use PTR_MANGLE/PTR_DEMANGLE for FILE vtables
- From: Joseph Myers <joseph at codesourcery dot com>
- To: Kees Cook <keescook at chromium dot org>
- Cc: Florian Weimer <fweimer at redhat dot com>, libc-alpha <libc-alpha at sourceware dot org>, Mike Frysinger <vapier at gentoo dot org>, Adam Conrad <adconrad at 0c3 dot net>
- Date: Thu, 1 Oct 2015 21:41:53 +0000
- Subject: Re: [PATCH v2] libio: use PTR_MANGLE/PTR_DEMANGLE for FILE vtables
- Authentication-results: sourceware.org; auth=none
- References: <20151001184048 dot GA31563 at www dot outflux dot net> <560D8108 dot 6060802 at redhat dot com> <alpine dot DEB dot 2 dot 10 dot 1510012059180 dot 9824 at digraph dot polyomino dot org dot uk> <CAGXu5jLbUeqy9+Q9KOVGaD=s_HQtz2bbyaFmNfcUf2n+9yqesQ at mail dot gmail dot com>
On Thu, 1 Oct 2015, Kees Cook wrote:
> On Thu, Oct 1, 2015 at 2:00 PM, Joseph Myers <joseph@codesourcery.com> wrote:
> > On Thu, 1 Oct 2015, Florian Weimer wrote:
> >
> >> Even better, if we can grab a few old binaries and they do not run on
> >> current systems for other libstdc++-related reasons (or perhaps we
> >
> > The libstdc++ SONAME changed in GCC 3.4, so any relevant binaries will be
> > using an old libstdc++ shared library (or possibly statically linked with
> > libstdc++ but dynamically linked with libc).
>
> So system without ancient static binaries and no libstdc++-v3 or
> earlier should be safe for this change? When did v4 happen? Seems like
> a long time ago?
It's still libstdc++-v3 even though it's gone through multiple SONAMEs
(it's been v3 since GCC 3.0). The question is libstdc++.so.5 or older -
or dynamically linked binaries from compilers of that vintage with
libstdc++.a linked in.
--
Joseph S. Myers
joseph@codesourcery.com