linux-kernel - Re: [PATCH] x86_64, asm: Work around AMD SYSRET SS descriptor attribute issue

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Message-ID: <20150424195809.GC24894@pd.tnic>
Date:	Fri, 24 Apr 2015 21:58:09 +0200
From:	Borislav Petkov <bp@...en8.de>
To:	Andy Lutomirski <luto@...nel.org>
Cc:	Denys Vlasenko <dvlasenk@...hat.com>, x86@...nel.org,
	"H. Peter Anvin" <hpa@...or.com>,
	Andy Lutomirski <luto@...capital.net>,
	Denys Vlasenko <vda.linux@...glemail.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Brian Gerst <brgerst@...il.com>,
	Ingo Molnar <mingo@...nel.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Oleg Nesterov <oleg@...hat.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Alexei Starovoitov <ast@...mgrid.com>,
	Will Drewry <wad@...omium.org>,
	Kees Cook <keescook@...omium.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] x86_64, asm: Work around AMD SYSRET SS descriptor
 attribute issue

On Fri, Apr 24, 2015 at 12:59:06PM +0200, Borislav Petkov wrote:
> Yeah, that makes more sense. So I tested Andy's patch but changed it as
> above and I get
> 
> $ taskset -c 0 ./sysret_ss_attrs_32
> [RUN]   Syscalls followed by SS validation
> [OK]    We survived

Andy, you wanted the 64-bit version too:

$ taskset -c 0 ./sysret_ss_attrs_64
[RUN]   Syscalls followed by SS validation
[OK]    We survived
$ taskset -c 0 ./sysret_ss_attrs_64
[RUN]   Syscalls followed by SS validation
[OK]    We survived

-- 
Regards/Gruss,
    Boris.

ECO tip #101: Trim your mails when you reply.
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