Jan Beulich 8a184632a1 x86emul/fuzz: add a state sanity checking function ...

This is to accompany sanitize_input(). Just like for initial state we
want to have state between two emulated insns sane, at least as far as
assumptions in the main emulator go. Do minimal checking after segment
register, CR, and MSR writes, and roll back to the old value in case of
failure (raising #GP(0) at the same time).

In the particular case observed, a CR0 write clearing CR0.PE was
followed by a VEX-encoded insn, which the decoder accepts based on
guest address size, restricting things just outside of the 64-bit case
(real and virtual modes don't allow VEX-encoded insns). Subsequently
_get_fpu() would then assert that CR0.PE must be set (and EFLAGS.VM
clear) when trying to invoke YMM, ZMM, or OPMASK state.

Signed-off-by: Jan Beulich <jbeulich@suse.com>
Reviewed-by: George Dunlap <george.dunlap@citrix.com>

2019-06-03 17:15:06 +02:00

..

afl-harness.c

fuzz/x86_emulate: Fix afl-harness batch mode file pointer leak

2017-10-27 14:44:05 +01:00

fuzz-emul.c

x86emul/fuzz: add a state sanity checking function

2019-06-03 17:15:06 +02:00

fuzz-emul.h

fuzz/x86_emulate: Move definitions into a header

2017-10-11 23:35:28 +01:00

Makefile

tools/x86emul: Use struct cpuid_policy in the userspace test harnesses

2018-11-12 18:07:16 +00:00