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KVM: x86 emulator: fix memory access during x86 emulation

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Currently when x86 emulator needs to access memory, page walk is done with
broadest permission possible, so if emulated instruction was executed
by userspace process it can still access kernel memory. Fix that by
providing correct memory access to page walker during emulation.

Signed-off-by: Gleb Natapov <gleb@redhat.com>
Cc: stable@kernel.org
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Gleb Natapov
2010-02-10 14:21:32 +02:00
committed by Marcelo Tosatti
parent a004475567
commit 1871c6020d
7 changed files with 142 additions and 50 deletions
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14
arch/x86/include/asm/kvm_emulate.h
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@ -54,13 +54,23 @@ struct x86_emulate_ctxt;
struct x86_emulate_ops {
/*
* read_std: Read bytes of standard (non-emulated/special) memory.
* Used for instruction fetch, stack operations, and others.
* Used for descriptor reading.
* @addr: [IN ] Linear address from which to read.
* @val: [OUT] Value read from memory, zero-extended to 'u_long'.
* @bytes: [IN ] Number of bytes to read from memory.
*/
int (*read_std)(unsigned long addr, void *val,
unsigned int bytes, struct kvm_vcpu *vcpu);
unsigned int bytes, struct kvm_vcpu *vcpu, u32 *error);
/*
* fetch: Read bytes of standard (non-emulated/special) memory.
* Used for instruction fetch.
* @addr: [IN ] Linear address from which to read.
* @val: [OUT] Value read from memory, zero-extended to 'u_long'.
* @bytes: [IN ] Number of bytes to read from memory.
*/
int (*fetch)(unsigned long addr, void *val,
unsigned int bytes, struct kvm_vcpu *vcpu, u32 *error);
/*
* read_emulated: Read bytes from emulated/special memory area.