Messages in this thread | | | Date | Mon, 22 Aug 2011 05:26:05 +0100 | From | Al Viro <> | Subject | Re: SYSCALL, ptrace and syscall restart breakages (Re: [RFC] weird crap with vdso on uml/i386) |
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On Sun, Aug 21, 2011 at 09:11:54PM -0700, H. Peter Anvin wrote: > > lack of point - the *only* CPU where it would matter would be K6-2, IIRC, > > and (again, IIRC) it had some differences in SYSCALL semantics compared to > > K7 (which supports SYSENTER as well). Bugger if I remember what those > > differences might've been... Some flag not cleared? > > The most likely reason for a binary to execute a stray SYSCALL is > because they read it out of the vdso. Totally daft, but we certainly > see a lot of stupid things as evidenced by the JIT thread earlier this > month.
Um... What, blindly, no matter what surrounds it in there? What will happen to the same eager JIT when it steps on SYSENTER?
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