Messages in this thread | | | Date | Mon, 24 Feb 2014 09:42:42 -0800 | From | "H. Peter Anvin" <> | Subject | Re: perf_fuzzer compiled for x32 causes reboot |
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On 02/24/2014 09:41 AM, Vince Weaver wrote: > On Mon, 24 Feb 2014, Vince Weaver wrote: > >> I do note that >> perf_callchain_user(); >> >> Does >> fp = (void __user *)regs->bp; >> >> ... >> >> bytes = copy_from_user_nmi(&frame, fp, sizeof(frame)); >> >> >> And in my particular executable RBP has nothing to do with a frame >> pointer, but is instead being used as a general purpose register. > > and as a reminder, I'm seeing this on an x32 executable, so > perf_callchain_user32() is probably coming into play. > > So maybe it is an x32 issue after all. >
No.
if (!test_thread_flag(TIF_IA32)) return 0;
TIF_IA32 is clear for an x32 process.
-hpa
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