KVM: x86: Check non-canonical addresses upon WRMSR

commit 854e8bb1aa06c578c2c9145fa6bfe3680ef63b23 upstream.

Upon WRMSR, the CPU should inject #GP if a non-canonical value (address) is
written to certain MSRs. The behavior is "almost" identical for AMD and Intel
(ignoring MSRs that are not implemented in either architecture since they would
anyhow #GP). However, IA32_SYSENTER_ESP and IA32_SYSENTER_EIP cause #GP if
non-canonical address is written on Intel but not on AMD (which ignores the top
32-bits).

Accordingly, this patch injects a #GP on the MSRs which behave identically on
Intel and AMD.  To eliminate the differences between the architecutres, the
value which is written to IA32_SYSENTER_ESP and IA32_SYSENTER_EIP is turned to
canonical value before writing instead of injecting a #GP.

Some references from Intel and AMD manuals:

According to Intel SDM description of WRMSR instruction #GP is expected on
WRMSR "If the source register contains a non-canonical address and ECX
specifies one of the following MSRs: IA32_DS_AREA, IA32_FS_BASE, IA32_GS_BASE,
IA32_KERNEL_GS_BASE, IA32_LSTAR, IA32_SYSENTER_EIP, IA32_SYSENTER_ESP."

According to AMD manual instruction manual:
LSTAR/CSTAR (SYSCALL): "The WRMSR instruction loads the target RIP into the
LSTAR and CSTAR registers.  If an RIP written by WRMSR is not in canonical
form, a general-protection exception (#GP) occurs."
IA32_GS_BASE and IA32_FS_BASE (WRFSBASE/WRGSBASE): "The address written to the
base field must be in canonical form or a #GP fault will occur."
IA32_KERNEL_GS_BASE (SWAPGS): "The address stored in the KernelGSbase MSR must
be in canonical form."

This patch fixes CVE-2014-3610.

Signed-off-by: Nadav Amit <namit@cs.technion.ac.il>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
[bwh: Backported to 3.2:
 - The various set_msr() functions all separate msr_index and data parameters]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index b3eb9a7..15d24cb 100644 (file)
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -821,6 +821,20 @@ static inline void kvm_inject_gp(struct kvm_vcpu *vcpu, u32 error_code)
        kvm_queue_exception_e(vcpu, GP_VECTOR, error_code);
 }
 
+static inline u64 get_canonical(u64 la)
+{
+       return ((int64_t)la << 16) >> 16;
+}
+
+static inline bool is_noncanonical_address(u64 la)
+{
+#ifdef CONFIG_X86_64
+       return get_canonical(la) != la;
+#else
+       return false;
+#endif
+}
+
 #define TSS_IOPB_BASE_OFFSET 0x66
 #define TSS_BASE_SIZE 0x68
 #define TSS_IOPB_SIZE (65536 / 8)

diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index 2102a17..82f97a5 100644 (file)
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -3109,7 +3109,7 @@ static int wrmsr_interception(struct vcpu_svm *svm)
 
 
        svm->next_rip = kvm_rip_read(&svm->vcpu) + 2;
-       if (svm_set_msr(&svm->vcpu, ecx, data)) {
+       if (kvm_set_msr(&svm->vcpu, ecx, data)) {
                trace_kvm_msr_write_ex(ecx, data);
                kvm_inject_gp(&svm->vcpu, 0);
        } else {

diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index a4f6bda..99518db 100644 (file)
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -4544,7 +4544,7 @@ static int handle_wrmsr(struct kvm_vcpu *vcpu)
        u64 data = (vcpu->arch.regs[VCPU_REGS_RAX] & -1u)
                | ((u64)(vcpu->arch.regs[VCPU_REGS_RDX] & -1u) << 32);
 
-       if (vmx_set_msr(vcpu, ecx, data) != 0) {
+       if (kvm_set_msr(vcpu, ecx, data) != 0) {
                trace_kvm_msr_write_ex(ecx, data);
                kvm_inject_gp(vcpu, 0);
                return 1;

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index b9fefaf..2d7d0df 100644 (file)
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -893,7 +893,6 @@ void kvm_enable_efer_bits(u64 mask)
 }
 EXPORT_SYMBOL_GPL(kvm_enable_efer_bits);
 
-
 /*
  * Writes msr value into into the appropriate "register".
  * Returns 0 on success, non-0 otherwise.
@@ -901,8 +900,34 @@ EXPORT_SYMBOL_GPL(kvm_enable_efer_bits);
  */
 int kvm_set_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 data)
 {
+       switch (msr_index) {
+       case MSR_FS_BASE:
+       case MSR_GS_BASE:
+       case MSR_KERNEL_GS_BASE:
+       case MSR_CSTAR:
+       case MSR_LSTAR:
+               if (is_noncanonical_address(data))
+                       return 1;
+               break;
+       case MSR_IA32_SYSENTER_EIP:
+       case MSR_IA32_SYSENTER_ESP:
+               /*
+                * IA32_SYSENTER_ESP and IA32_SYSENTER_EIP cause #GP if
+                * non-canonical address is written on Intel but not on
+                * AMD (which ignores the top 32-bits, because it does
+                * not implement 64-bit SYSENTER).
+                *
+                * 64-bit code should hence be able to write a non-canonical
+                * value on AMD.  Making the address canonical ensures that
+                * vmentry does not fail on Intel after writing a non-canonical
+                * value, and that something deterministic happens if the guest
+                * invokes 64-bit SYSENTER.
+                */
+               data = get_canonical(data);
+       }
        return kvm_x86_ops->set_msr(vcpu, msr_index, data);
 }
+EXPORT_SYMBOL_GPL(kvm_set_msr);
 
 /*
  * Adapt set_msr() to msr_io()'s calling convention