Re: [PATCH 07/12] perf_events: add LBR software filter support forIntel X86
From: Peter Zijlstra
Date: Thu Oct 06 2011 - 12:44:13 EST
On Thu, 2011-10-06 at 17:32 +0200, Andi Kleen wrote:
> > + kernel_insn_init(&insn, kaddr);
> > + insn_get_opcode(&insn);
> This makes me uncomfortable. AFAIK that's the first use of the opcode
> decoder being used directly for user space. It has a quite large attack
> surface. Who says it cannot be exploited?
doesn't use the opcode decoder on user space code?
ISTR Masami telling me they ran fuzzers on it, feeding it bad
instructions etc. But maybe he can tell more.
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