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Date: Thu, 23 Apr 2015 11:56:31 +0200 From: Borislav Petkov <bp@...en8.de> To: Denys Vlasenko <dvlasenk@...hat.com> Cc: 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>, Andy Lutomirski <luto@...capital.net>, 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 Subject: Re: [tip:x86/vdso] x86/vdso32/syscall.S: Do not load __USER32_DS to %ss On Thu, Apr 23, 2015 at 11:20:56AM +0200, Denys Vlasenko wrote: > * what if %ss before syscall was NOT the usual value of 0x2b, but some > other segment, not the typical 0-base, 0xffffffff limit 32-bit expand-up one? > Not restoring proper %ss would not go well. > [but then, Intel CPUs work, and old code worked....] Have we run the exact same reproducer on Intel already? Brian, can you run the same thing on an Intel box, if you haven't done so already? Thanks. -- Regards/Gruss, Boris. ECO tip #101: Trim your mails when you reply. -- -- 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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