From: Borislav Petkov <bp@alien8.de>
To: Andy Lutomirski <luto@amacapital.net>
Cc: "Denys Vlasenko" <vda.linux@googlemail.com>,
"Denys Vlasenko" <dvlasenk@redhat.com>,
"Brian Gerst" <brgerst@gmail.com>,
"Steven Rostedt" <rostedt@goodmis.org>,
"Oleg Nesterov" <oleg@redhat.com>,
"Ingo Molnar" <mingo@kernel.org>,
"H. Peter Anvin" <hpa@zytor.com>,
"Linus Torvalds" <torvalds@linux-foundation.org>,
"Andy Lutomirski" <luto@kernel.org>,
"Will Drewry" <wad@chromium.org>,
"Frédéric Weisbecker" <fweisbec@gmail.com>,
"Alexei Starovoitov" <ast@plumgrid.com>,
"Linux Kernel Mailing List" <linux-kernel@vger.kernel.org>,
"Kees Cook" <keescook@chromium.org>,
"Thomas Gleixner" <tglx@linutronix.de>,
"linux-tip-commits@vger.kernel.org"
<linux-tip-commits@vger.kernel.org>
Subject: Re: [tip:x86/vdso] x86/vdso32/syscall.S: Do not load __USER32_DS to %ss
Date: Thu, 23 Apr 2015 19:14:40 +0200 [thread overview]
Message-ID: <20150423171440.GP28327@pd.tnic> (raw)
In-Reply-To: <CALCETrUHUJeVWC+qAwvrDF1dvPMY7jZcNNVh2gM77pw3db9JVg@mail.gmail.com>
On Thu, Apr 23, 2015 at 09:50:17AM -0700, Andy Lutomirski wrote:
> On Thu, Apr 23, 2015 at 9:41 AM, Denys Vlasenko
> <vda.linux@googlemail.com> wrote:
> > An alternative fix would be, if we decided to schedule
> > in an interrupt, check %ss for zero and reload it
> > with __KERNEL_DS before schedule.
>
> For anyone who has the right hardware (not me!), a possible reproducer is here:
>
> https://git.kernel.org/cgit/linux/kernel/git/luto/misc-tests.git/
>
> make && taskset -c 0 ./sysret_ss_attrs_32
[ 195.438441] traps: sysret_ss_attrs[1745] trap stack segment ip:f77dab87 sp:ffdf0b70 error:0
[ 196.831952] traps: sysret_ss_attrs[1748] trap stack segment ip:f7786b87 sp:fffc0810 error:0
Ran it twice.
--
Regards/Gruss,
Boris.
ECO tip #101: Trim your mails when you reply.
--
next prev parent reply other threads:[~2015-04-23 17:14 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-03-26 1:11 [GIT PULL] x86/vdso changes for 4.1 Andy Lutomirski
[not found] ` <efe1ec29eda830b1d0030882706f3dac99ce1f73.1427482063.git.luto@kernel.org>
2015-03-27 18:47 ` [GIT PULL 2/4] x86: vdso32/syscall.S: do not load __USER32_DS to %ss Andy Lutomirski
2015-03-27 18:48 ` [GIT PULL 1/4] x86,vdso: fix the x86 vdso2c tool includes Andy Lutomirski
2015-03-27 18:48 ` [GIT PULL 2/4] x86: vdso32/syscall.S: do not load __USER32_DS to %ss Andy Lutomirski
2015-03-31 12:38 ` [tip:x86/vdso] x86/vdso32/syscall.S: Do " tip-bot for Denys Vlasenko
2015-04-23 7:37 ` Brian Gerst
2015-04-23 8:49 ` Andy Lutomirski
2015-04-23 9:07 ` Andy Lutomirski
2015-04-23 9:23 ` Denys Vlasenko
2015-04-23 9:47 ` Borislav Petkov
2015-04-23 9:56 ` Denys Vlasenko
2015-04-23 10:18 ` Borislav Petkov
2015-04-23 10:26 ` Denys Vlasenko
2015-04-23 10:44 ` Borislav Petkov
2015-04-23 11:05 ` Denys Vlasenko
2015-04-23 15:48 ` Andy Lutomirski
2015-04-23 16:41 ` Denys Vlasenko
2015-04-23 16:50 ` Andy Lutomirski
2015-04-23 17:14 ` Borislav Petkov [this message]
2015-04-23 18:24 ` Andy Lutomirski
2015-04-23 18:36 ` Linus Torvalds
2015-04-23 18:52 ` Borislav Petkov
2015-04-23 19:20 ` Andy Lutomirski
2015-04-23 19:50 ` Denys Vlasenko
2015-04-23 9:20 ` Denys Vlasenko
2015-04-23 9:56 ` Borislav Petkov
2015-04-23 11:11 ` Brian Gerst
2015-04-23 11:28 ` Brian Gerst
2015-04-23 11:46 ` Denys Vlasenko
2015-04-23 12:01 ` Brian Gerst
2015-04-23 12:35 ` Denys Vlasenko
2015-04-23 11:12 ` Denys Vlasenko
2015-03-27 18:48 ` [GIT PULL 3/4] x86, vdso: teach 'make clean' remove generated vdso-image-*.c files Andy Lutomirski
2015-03-31 12:38 ` [tip:x86/vdso] x86/vdso: Teach 'make clean' to " tip-bot for Andrey Skvortsov
2015-03-27 18:48 ` [GIT PULL 4/4] x86, vdso: Remove x32 intermediates during 'make clean' Andy Lutomirski
2015-03-31 12:39 ` [tip:x86/vdso] x86/vdso: Remove x32 intermediates during ' make clean' tip-bot for Andy Lutomirski
2015-03-31 12:38 ` [tip:x86/vdso] x86/vdso: Fix the x86 vdso2c tool includes tip-bot for Tommi Kyntola
-- strict thread matches above, loose matches on Subject: below --
2015-02-16 14:15 [PATCH] x86,vdso: fix " Tommi Kyntola
2015-02-16 16:29 ` Andy Lutomirski
[not found] ` <CAO2cUkRstHcKzy+sMvaQoXHBjTX1yheN2EMQW-wCd0tDRCLNYQ@mail.gmail.com>
2015-02-16 20:40 ` Andy Lutomirski
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