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Date: Sun, 19 Feb 2012 15:34:39 -0500 From: Steven Rostedt <rostedt@...dmis.org> To: "hpanvin@...il.com" <hpa@...or.com> Cc: Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org, Andrew Morton <akpm@...ux-foundation.org>, Peter Zijlstra <a.p.zijlstra@...llo.nl> Subject: Re: [PATCH][GIT PULL][v3.3] x86: Test saved %rip in NMI to determine nested NMI On Sun, 2012-02-19 at 05:46 -0800, hpanvin@...il.com wrote: > Vsyscall page, not vdso... > Peter, My original patch was to check the %cs register against __KERNEL_CS, but IIRC, you said that userspace can change that register to anything it wanted before doing a long jump or something. Is this true for x86_64 as well? I guess it would be because x86_64 can support 32bit apps. Anyway, I'll add a check that makes sure that the RIP is less than the FIXADDR sections as well. -- Steve -- 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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