forked from Minki/linux
KVM: x86 emulator: Add LOCK prefix validity checking
Instructions which are not allowed to have LOCK prefix should generate #UD if one is used. [avi: fold opcode 82 fix from another patch] Signed-off-by: Gleb Natapov <gleb@redhat.com> Signed-off-by: Avi Kivity <avi@redhat.com>
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e92805ac12
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@ -76,6 +76,7 @@
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#define GroupDual (1<<15) /* Alternate decoding of mod == 3 */
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#define GroupMask 0xff /* Group number stored in bits 0:7 */
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/* Misc flags */
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#define Lock (1<<26) /* lock prefix is allowed for the instruction */
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#define Priv (1<<27) /* instruction generates #GP if current CPL != 0 */
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#define No64 (1<<28)
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/* Source 2 operand type */
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@ -94,35 +95,35 @@ enum {
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static u32 opcode_table[256] = {
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/* 0x00 - 0x07 */
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ByteOp | DstMem | SrcReg | ModRM, DstMem | SrcReg | ModRM,
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ByteOp | DstMem | SrcReg | ModRM | Lock, DstMem | SrcReg | ModRM | Lock,
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ByteOp | DstReg | SrcMem | ModRM, DstReg | SrcMem | ModRM,
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ByteOp | DstAcc | SrcImm, DstAcc | SrcImm,
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ImplicitOps | Stack | No64, ImplicitOps | Stack | No64,
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/* 0x08 - 0x0F */
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ByteOp | DstMem | SrcReg | ModRM, DstMem | SrcReg | ModRM,
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ByteOp | DstMem | SrcReg | ModRM | Lock, DstMem | SrcReg | ModRM | Lock,
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ByteOp | DstReg | SrcMem | ModRM, DstReg | SrcMem | ModRM,
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ByteOp | DstAcc | SrcImm, DstAcc | SrcImm,
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ImplicitOps | Stack | No64, 0,
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/* 0x10 - 0x17 */
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ByteOp | DstMem | SrcReg | ModRM, DstMem | SrcReg | ModRM,
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ByteOp | DstMem | SrcReg | ModRM | Lock, DstMem | SrcReg | ModRM | Lock,
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ByteOp | DstReg | SrcMem | ModRM, DstReg | SrcMem | ModRM,
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ByteOp | DstAcc | SrcImm, DstAcc | SrcImm,
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ImplicitOps | Stack | No64, ImplicitOps | Stack | No64,
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/* 0x18 - 0x1F */
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ByteOp | DstMem | SrcReg | ModRM, DstMem | SrcReg | ModRM,
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ByteOp | DstMem | SrcReg | ModRM | Lock, DstMem | SrcReg | ModRM | Lock,
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ByteOp | DstReg | SrcMem | ModRM, DstReg | SrcMem | ModRM,
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ByteOp | DstAcc | SrcImm, DstAcc | SrcImm,
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ImplicitOps | Stack | No64, ImplicitOps | Stack | No64,
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/* 0x20 - 0x27 */
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ByteOp | DstMem | SrcReg | ModRM, DstMem | SrcReg | ModRM,
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ByteOp | DstMem | SrcReg | ModRM | Lock, DstMem | SrcReg | ModRM | Lock,
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ByteOp | DstReg | SrcMem | ModRM, DstReg | SrcMem | ModRM,
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DstAcc | SrcImmByte, DstAcc | SrcImm, 0, 0,
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/* 0x28 - 0x2F */
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ByteOp | DstMem | SrcReg | ModRM, DstMem | SrcReg | ModRM,
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ByteOp | DstMem | SrcReg | ModRM | Lock, DstMem | SrcReg | ModRM | Lock,
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ByteOp | DstReg | SrcMem | ModRM, DstReg | SrcMem | ModRM,
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0, 0, 0, 0,
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/* 0x30 - 0x37 */
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ByteOp | DstMem | SrcReg | ModRM, DstMem | SrcReg | ModRM,
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ByteOp | DstMem | SrcReg | ModRM | Lock, DstMem | SrcReg | ModRM | Lock,
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ByteOp | DstReg | SrcMem | ModRM, DstReg | SrcMem | ModRM,
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0, 0, 0, 0,
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/* 0x38 - 0x3F */
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@ -158,7 +159,7 @@ static u32 opcode_table[256] = {
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Group | Group1_80, Group | Group1_81,
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Group | Group1_82, Group | Group1_83,
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ByteOp | DstMem | SrcReg | ModRM, DstMem | SrcReg | ModRM,
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ByteOp | DstMem | SrcReg | ModRM, DstMem | SrcReg | ModRM,
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ByteOp | DstMem | SrcReg | ModRM | Lock, DstMem | SrcReg | ModRM | Lock,
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/* 0x88 - 0x8F */
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ByteOp | DstMem | SrcReg | ModRM | Mov, DstMem | SrcReg | ModRM | Mov,
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ByteOp | DstReg | SrcMem | ModRM | Mov, DstReg | SrcMem | ModRM | Mov,
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@ -263,17 +264,18 @@ static u32 twobyte_table[256] = {
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DstMem | SrcReg | Src2CL | ModRM, 0, 0,
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/* 0xA8 - 0xAF */
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ImplicitOps | Stack, ImplicitOps | Stack,
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0, DstMem | SrcReg | ModRM | BitOp,
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0, DstMem | SrcReg | ModRM | BitOp | Lock,
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DstMem | SrcReg | Src2ImmByte | ModRM,
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DstMem | SrcReg | Src2CL | ModRM,
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ModRM, 0,
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/* 0xB0 - 0xB7 */
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ByteOp | DstMem | SrcReg | ModRM, DstMem | SrcReg | ModRM, 0,
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DstMem | SrcReg | ModRM | BitOp,
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ByteOp | DstMem | SrcReg | ModRM | Lock, DstMem | SrcReg | ModRM | Lock,
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0, DstMem | SrcReg | ModRM | BitOp | Lock,
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0, 0, ByteOp | DstReg | SrcMem | ModRM | Mov,
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DstReg | SrcMem16 | ModRM | Mov,
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/* 0xB8 - 0xBF */
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0, 0, Group | Group8, DstMem | SrcReg | ModRM | BitOp,
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0, 0,
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Group | Group8, DstMem | SrcReg | ModRM | BitOp | Lock,
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0, 0, ByteOp | DstReg | SrcMem | ModRM | Mov,
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DstReg | SrcMem16 | ModRM | Mov,
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/* 0xC0 - 0xCF */
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@ -290,25 +292,41 @@ static u32 twobyte_table[256] = {
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static u32 group_table[] = {
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[Group1_80*8] =
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ByteOp | DstMem | SrcImm | ModRM, ByteOp | DstMem | SrcImm | ModRM,
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ByteOp | DstMem | SrcImm | ModRM, ByteOp | DstMem | SrcImm | ModRM,
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ByteOp | DstMem | SrcImm | ModRM, ByteOp | DstMem | SrcImm | ModRM,
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ByteOp | DstMem | SrcImm | ModRM, ByteOp | DstMem | SrcImm | ModRM,
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ByteOp | DstMem | SrcImm | ModRM | Lock,
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ByteOp | DstMem | SrcImm | ModRM | Lock,
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ByteOp | DstMem | SrcImm | ModRM | Lock,
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ByteOp | DstMem | SrcImm | ModRM | Lock,
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ByteOp | DstMem | SrcImm | ModRM | Lock,
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ByteOp | DstMem | SrcImm | ModRM | Lock,
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ByteOp | DstMem | SrcImm | ModRM | Lock,
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ByteOp | DstMem | SrcImm | ModRM,
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[Group1_81*8] =
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DstMem | SrcImm | ModRM, DstMem | SrcImm | ModRM,
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DstMem | SrcImm | ModRM, DstMem | SrcImm | ModRM,
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DstMem | SrcImm | ModRM, DstMem | SrcImm | ModRM,
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DstMem | SrcImm | ModRM, DstMem | SrcImm | ModRM,
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DstMem | SrcImm | ModRM | Lock,
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DstMem | SrcImm | ModRM | Lock,
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DstMem | SrcImm | ModRM | Lock,
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DstMem | SrcImm | ModRM | Lock,
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DstMem | SrcImm | ModRM | Lock,
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DstMem | SrcImm | ModRM | Lock,
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DstMem | SrcImm | ModRM | Lock,
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DstMem | SrcImm | ModRM,
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[Group1_82*8] =
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ByteOp | DstMem | SrcImm | ModRM, ByteOp | DstMem | SrcImm | ModRM,
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ByteOp | DstMem | SrcImm | ModRM, ByteOp | DstMem | SrcImm | ModRM,
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ByteOp | DstMem | SrcImm | ModRM, ByteOp | DstMem | SrcImm | ModRM,
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ByteOp | DstMem | SrcImm | ModRM, ByteOp | DstMem | SrcImm | ModRM,
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ByteOp | DstMem | SrcImm | ModRM | Lock,
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ByteOp | DstMem | SrcImm | ModRM | Lock,
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ByteOp | DstMem | SrcImm | ModRM | Lock,
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ByteOp | DstMem | SrcImm | ModRM | Lock,
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ByteOp | DstMem | SrcImm | ModRM | Lock,
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ByteOp | DstMem | SrcImm | ModRM | Lock,
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ByteOp | DstMem | SrcImm | ModRM | Lock,
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ByteOp | DstMem | SrcImm | ModRM,
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[Group1_83*8] =
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DstMem | SrcImmByte | ModRM, DstMem | SrcImmByte | ModRM,
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DstMem | SrcImmByte | ModRM, DstMem | SrcImmByte | ModRM,
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DstMem | SrcImmByte | ModRM, DstMem | SrcImmByte | ModRM,
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DstMem | SrcImmByte | ModRM, DstMem | SrcImmByte | ModRM,
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DstMem | SrcImmByte | ModRM | Lock,
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DstMem | SrcImmByte | ModRM | Lock,
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DstMem | SrcImmByte | ModRM | Lock,
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DstMem | SrcImmByte | ModRM | Lock,
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DstMem | SrcImmByte | ModRM | Lock,
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DstMem | SrcImmByte | ModRM | Lock,
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DstMem | SrcImmByte | ModRM | Lock,
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DstMem | SrcImmByte | ModRM,
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[Group1A*8] =
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DstMem | SrcNone | ModRM | Mov | Stack, 0, 0, 0, 0, 0, 0, 0,
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[Group3_Byte*8] =
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@ -332,10 +350,10 @@ static u32 group_table[] = {
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SrcMem16 | ModRM | Mov | Priv, SrcMem | ModRM | ByteOp | Priv,
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[Group8*8] =
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0, 0, 0, 0,
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DstMem | SrcImmByte | ModRM, DstMem | SrcImmByte | ModRM,
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DstMem | SrcImmByte | ModRM, DstMem | SrcImmByte | ModRM,
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DstMem | SrcImmByte | ModRM, DstMem | SrcImmByte | ModRM | Lock,
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DstMem | SrcImmByte | ModRM | Lock, DstMem | SrcImmByte | ModRM | Lock,
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[Group9*8] =
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0, ImplicitOps | ModRM, 0, 0, 0, 0, 0, 0,
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0, ImplicitOps | ModRM | Lock, 0, 0, 0, 0, 0, 0,
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};
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static u32 group2_table[] = {
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@ -1580,8 +1598,7 @@ emulate_syscall(struct x86_emulate_ctxt *ctxt)
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u64 msr_data;
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/* syscall is not available in real mode */
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if (c->lock_prefix || ctxt->mode == X86EMUL_MODE_REAL
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|| ctxt->mode == X86EMUL_MODE_VM86)
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if (ctxt->mode == X86EMUL_MODE_REAL || ctxt->mode == X86EMUL_MODE_VM86)
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return -1;
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setup_syscalls_segments(ctxt, &cs, &ss);
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@ -1629,10 +1646,6 @@ emulate_sysenter(struct x86_emulate_ctxt *ctxt)
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struct kvm_segment cs, ss;
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u64 msr_data;
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/* inject #UD if LOCK prefix is used */
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if (c->lock_prefix)
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return -1;
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/* inject #GP if in real mode */
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if (ctxt->mode == X86EMUL_MODE_REAL) {
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kvm_inject_gp(ctxt->vcpu, 0);
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@ -1694,10 +1707,6 @@ emulate_sysexit(struct x86_emulate_ctxt *ctxt)
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u64 msr_data;
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int usermode;
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/* inject #UD if LOCK prefix is used */
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if (c->lock_prefix)
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return -1;
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/* inject #GP if in real mode or Virtual 8086 mode */
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if (ctxt->mode == X86EMUL_MODE_REAL ||
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ctxt->mode == X86EMUL_MODE_VM86) {
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@ -1819,6 +1828,12 @@ x86_emulate_insn(struct x86_emulate_ctxt *ctxt, struct x86_emulate_ops *ops)
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memcpy(c->regs, ctxt->vcpu->arch.regs, sizeof c->regs);
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saved_eip = c->eip;
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/* LOCK prefix is allowed only with some instructions */
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if (c->lock_prefix && !(c->d & Lock)) {
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kvm_queue_exception(ctxt->vcpu, UD_VECTOR);
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goto done;
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}
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/* Privileged instruction can be executed only in CPL=0 */
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if ((c->d & Priv) && kvm_x86_ops->get_cpl(ctxt->vcpu)) {
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kvm_inject_gp(ctxt->vcpu, 0);
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