From: Denys Vlasenko <dvlasenk@redhat.com>
To: Andy Lutomirski <luto@kernel.org>, X86 ML <x86@kernel.org>
Cc: "H. Peter Anvin" <hpa@zytor.com>, Borislav Petkov <bp@alien8.de>,
Denys Vlasenko <vda.linux@googlemail.com>,
Linus Torvalds <torvalds@linux-foundation.org>,
Brian Gerst <brgerst@gmail.com>, Ingo Molnar <mingo@kernel.org>,
Steven Rostedt <rostedt@goodmis.org>,
Oleg Nesterov <oleg@redhat.com>,
Frederic Weisbecker <fweisbec@gmail.com>,
Alexei Starovoitov <ast@plumgrid.com>,
Will Drewry <wad@chromium.org>, Kees Cook <keescook@chromium.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] x86, selftests: Add a test for the "sysret_ss_attrs" bug
Date: Sat, 25 Apr 2015 15:55:25 +0200 [thread overview]
Message-ID: <553B9CCD.4040408@redhat.com> (raw)
In-Reply-To: <resend_4d740841bac383742949e2fefb03982736595087.git.luto@kernel.org>
On 04/25/2015 12:09 AM, Andy Lutomirski wrote:
> On AMD CPUs, SYSRET can return with a valid SS descriptor with with
> the hidden attributes set to an unusable state. Make sure the kernel
> doesn't let this happen. This detects an as-yet-unfixed regression.
>
> Note that the 64-bit version of this test fails on AMD CPUs on all
> kernel versions, although the issue in the 64-bit case is much less
> severe than in the 32-bit case.
Confirmed to detect the "bug" in 64-bit userspace.
next prev parent reply other threads:[~2015-04-25 13:56 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-04-24 22:09 Andy Lutomirski
2015-04-25 13:55 ` Denys Vlasenko [this message]
2015-05-08 13:30 ` [tip:x86/asm] x86, selftests: Add a test for the "sysret_ss_attrs " bug tip-bot for Andy Lutomirski
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