KVM: x86: emulator: Fix illegal LEA handling

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The emulator mishandles LEA with register source operand. Even though such
LEA is illegal, it can be encoded and fed to CPU. In which case real
hardware throws #UD. The emulator, instead, returns address of
x86_emulate_ctxt._regs. This info leak hurts host's kASLR.

Tell the decoder that illegal LEA is not to be emulated.

Signed-off-by: Michal Luczaj <mhal@rbox.co>
Message-Id: <20220729134801.1120-1-mhal@rbox.co>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

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Michal Luczaj 2022-07-29 15:48:01 +02:00 • committed by Paolo Bonzini

parent 2bc685e633

commit 4ac5b42377

1 changed files with 5 additions and 1 deletions

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arch/x86/kvm/emulate.c

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