Re: [tip:x86/vdso] x86/vdso32/syscall.S: Do not load __USER32_DS to %ss
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- Subject: Re: [tip:x86/vdso] x86/vdso32/syscall.S: Do not load __USER32_DS to %ss
- From: Andy Lutomirski <luto@xxxxxxxxxxxxxx>
- Date: Thu, 23 Apr 2015 09:50:17 -0700
- Cc: Borislav Petkov <bp@xxxxxxxxx>, Denys Vlasenko <dvlasenk@xxxxxxxxxx>, Brian Gerst <brgerst@xxxxxxxxx>, Steven Rostedt <rostedt@xxxxxxxxxxx>, Oleg Nesterov <oleg@xxxxxxxxxx>, Ingo Molnar <mingo@xxxxxxxxxx>, "H. Peter Anvin" <hpa@xxxxxxxxx>, Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>, Andy Lutomirski <luto@xxxxxxxxxx>, Will Drewry <wad@xxxxxxxxxxxx>, Frédéric Weisbecker <fweisbec@xxxxxxxxx>, Alexei Starovoitov <ast@xxxxxxxxxxxx>, Linux Kernel Mailing List <linux-kernel@xxxxxxxxxxxxxxx>, Kees Cook <keescook@xxxxxxxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxxxxx>, "linux-tip-commits@xxxxxxxxxxxxxxx" <linux-tip-commits@xxxxxxxxxxxxxxx>
- In-reply-to: <CAK1hOcNTmAjVv5YHPSFUsA40y9dAoHPsQkKOTnYqqAf_gSs9Sg@mail.gmail.com>
On Thu, Apr 23, 2015 at 9:41 AM, Denys Vlasenko
<vda.linux@xxxxxxxxxxxxxx> 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
--Andy
--
Andy Lutomirski
AMA Capital Management, LLC
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