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[Xen-devel] x86_emulate(): Upon LOCK prefix for MOV, should inject #UD r
| To: | <xen-devel@xxxxxxxxxxxxxxxxxxx> |
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| Subject: | [Xen-devel] x86_emulate(): Upon LOCK prefix for MOV, should inject #UD rather than #GP? |
| From: | "Liu, Eric E" <eric.e.liu@xxxxxxxxx> |
| Date: | Thu, 20 Dec 2007 10:58:51 +0800 |
| Delivery-date: | Wed, 19 Dec 2007 18:59:46 -0800 |
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| Thread-index: | AchCtD/3n07kelioRSCaZ5nHelu8BQ== |
| Thread-topic: | x86_emulate(): Upon LOCK prefix for MOV, should inject #UD rather than #GP? |
Hi all,
The Intel SDM(2A) says that if the LOCK prefix is used with some
instructions such as "mov" and the souce operand is a memory operand, a
#UD may be generated, but in the x86_emulate.c there are places such as
:
942 /* Lock prefix is allowed only on RMW instructions.
*/
943 generate_exception_if((d & Mov) && lock_prefix,
EXC_GP);
here we inject EXC_GP but not EXC_UD, is it a bug?
--Eric (Liu, Feng)
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