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Date: Thu, 23 Apr 2015 09:50:17 -0700 From: Andy Lutomirski <luto@...capital.net> To: Denys Vlasenko <vda.linux@...glemail.com> Cc: Borislav Petkov <bp@...en8.de>, Denys Vlasenko <dvlasenk@...hat.com>, Brian Gerst <brgerst@...il.com>, Steven Rostedt <rostedt@...dmis.org>, Oleg Nesterov <oleg@...hat.com>, Ingo Molnar <mingo@...nel.org>, "H. Peter Anvin" <hpa@...or.com>, Linus Torvalds <torvalds@...ux-foundation.org>, Andy Lutomirski <luto@...nel.org>, Will Drewry <wad@...omium.org>, Frédéric Weisbecker <fweisbec@...il.com>, Alexei Starovoitov <ast@...mgrid.com>, Linux Kernel Mailing List <linux-kernel@...r.kernel.org>, Kees Cook <keescook@...omium.org>, Thomas Gleixner <tglx@...utronix.de>, "linux-tip-commits@...r.kernel.org" <linux-tip-commits@...r.kernel.org> Subject: Re: [tip:x86/vdso] x86/vdso32/syscall.S: Do not load __USER32_DS to %ss On Thu, Apr 23, 2015 at 9:41 AM, Denys Vlasenko <vda.linux@...glemail.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 --Andy -- Andy Lutomirski AMA Capital Management, LLC -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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