diff options
| author | Avi Kivity <avi@redhat.com> | 2009-11-24 15:20:15 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2009-12-18 14:03:32 -0800 |
| commit | b63569376aeca6300e10bf9e5ccfc49758407dbf (patch) | |
| tree | a572633f4b99638b010194f7e988937103f69f86 /arch | |
| parent | 7cb056b8203edc77c0b69431cf1312805a008484 (diff) | |
KVM: x86 emulator: limit instructions to 15 bytes
commit eb3c79e64a70fb8f7473e30fa07e89c1ecc2c9bb upstream.
While we are never normally passed an instruction that exceeds 15 bytes,
smp games can cause us to attempt to interpret one, which will cause
large latencies in non-preempt hosts.
Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86/include/asm/kvm_emulate.h | 2 | ||||
| -rw-r--r-- | arch/x86/kvm/emulate.c | 5 |
2 files changed, 5 insertions, 2 deletions
diff --git a/arch/x86/include/asm/kvm_emulate.h b/arch/x86/include/asm/kvm_emulate.h index b7ed2c423116..7c18e1230f54 100644 --- a/arch/x86/include/asm/kvm_emulate.h +++ b/arch/x86/include/asm/kvm_emulate.h @@ -129,7 +129,7 @@ struct decode_cache { u8 seg_override; unsigned int d; unsigned long regs[NR_VCPU_REGS]; - unsigned long eip; + unsigned long eip, eip_orig; /* modrm */ u8 modrm; u8 modrm_mod; diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c index 1be5cd640e93..e02dbb670d5b 100644 --- a/arch/x86/kvm/emulate.c +++ b/arch/x86/kvm/emulate.c @@ -613,6 +613,9 @@ static int do_insn_fetch(struct x86_emulate_ctxt *ctxt, { int rc = 0; + /* x86 instructions are limited to 15 bytes. */ + if (eip + size - ctxt->decode.eip_orig > 15) + return X86EMUL_UNHANDLEABLE; eip += ctxt->cs_base; while (size--) { rc = do_fetch_insn_byte(ctxt, ops, eip++, dest++); @@ -871,7 +874,7 @@ x86_decode_insn(struct x86_emulate_ctxt *ctxt, struct x86_emulate_ops *ops) /* Shadow copy of register state. Committed on successful emulation. */ memset(c, 0, sizeof(struct decode_cache)); - c->eip = kvm_rip_read(ctxt->vcpu); + c->eip = c->eip_orig = kvm_rip_read(ctxt->vcpu); ctxt->cs_base = seg_base(ctxt, VCPU_SREG_CS); memcpy(c->regs, ctxt->vcpu->arch.regs, sizeof c->regs); |