Date: Tue, 19 Jun 2012 19:15:54 +0100 From: Steven Chamberlain <steven@pyro.eu.org> To: freebsd-security@freebsd.org Cc: bz@freebsd.org, "Simon L. B. Nielsen" <simon@FreeBSD.org> Subject: Re: Update for FreeBSD Security Advisory FreeBSD-SA-12:04.sysret for 8.1 Message-ID: <4FE0C1DA.2080809@pyro.eu.org> In-Reply-To: <497105EC-3223-4E59-A6E6-F810A15BCA5C@FreeBSD.org> References: <497105EC-3223-4E59-A6E6-F810A15BCA5C@FreeBSD.org>
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Hi, Thanks a lot of looking into this! On 18/06/12 22:37, Simon L. B. Nielsen wrote: > Note that this is ONLY for FreeBSD 8.1. Other branches are OK. Having seen the correct fix now, I'm starting to wonder if the commit to RELENG_7_4 was really okay too? http://svnweb.freebsd.org/base/releng/7.4/sys/amd64/amd64/trap.c?annotate=236953#l975 The inserted code does not appear at the end of the function, like it does now in all other versions including 8.1 which is the most similar. I expect this would at least trap if the exploit was attempted, but then it would omit the rest of the function, including userret(); would that have consequences? Thanks, Regards, -- Steven Chamberlain steven@pyro.eu.org
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