Messages in this thread | | | Subject | Re: [PATCH][GIT PULL][v3.3] x86: Test saved %rip in NMI to determine nested NMI | From | Steven Rostedt <> | Date | Sun, 19 Feb 2012 15:34:39 -0500 |
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On Sun, 2012-02-19 at 05:46 -0800, hpanvin@gmail.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
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