KVM: VMX: Properly handle kvm_read/write_guest_virt*() result
Syzbot reports the following issue:
WARNING: CPU: 0 PID: 6819 at arch/x86/kvm/x86.c:618
kvm_inject_emulated_page_fault+0x210/0x290 arch/x86/kvm/x86.c:618
...
Call Trace:
...
RIP: 0010:kvm_inject_emulated_page_fault+0x210/0x290 arch/x86/kvm/x86.c:618
...
nested_vmx_get_vmptr+0x1f9/0x2a0 arch/x86/kvm/vmx/nested.c:4638
handle_vmon arch/x86/kvm/vmx/nested.c:4767 [inline]
handle_vmon+0x168/0x3a0 arch/x86/kvm/vmx/nested.c:4728
vmx_handle_exit+0x29c/0x1260 arch/x86/kvm/vmx/vmx.c:6067
'exception' we're trying to inject with kvm_inject_emulated_page_fault()
comes from:
nested_vmx_get_vmptr()
kvm_read_guest_virt()
kvm_read_guest_virt_helper()
vcpu->arch.walk_mmu->gva_to_gpa()
but it is only set when GVA to GPA conversion fails. In case it doesn't but
we still fail kvm_vcpu_read_guest_page(), X86EMUL_IO_NEEDED is returned and
nested_vmx_get_vmptr() calls kvm_inject_emulated_page_fault() with zeroed
'exception'. This happen when the argument is MMIO.
Paolo also noticed that nested_vmx_get_vmptr() is not the only place in
KVM code where kvm_read/write_guest_virt*() return result is mishandled.
VMX instructions along with INVPCID have the same issue. This was already
noticed before, e.g. see commit 541ab2aeb282 ("KVM: x86: work around
leak of uninitialized stack contents") but was never fully fixed.
KVM could've handled the request correctly by going to userspace and
performing I/O but there doesn't seem to be a good need for such requests
in the first place.
Introduce vmx_handle_memory_failure() as an interim solution.
Note, nested_vmx_get_vmptr() now has three possible outcomes: OK, PF,
KVM_EXIT_INTERNAL_ERROR and callers need to know if userspace exit is
needed (for KVM_EXIT_INTERNAL_ERROR) in case of failure. We don't seem
to have a good enum describing this tristate, just add "int *ret" to
nested_vmx_get_vmptr() interface to pass the information.
Reported-by: syzbot+2a7156e11dc199bdbd8a@syzkaller.appspotmail.com
Suggested-by: Sean Christopherson <sean.j.christopherson@intel.com>
Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Message-Id: <20200605115906.532682-1-vkuznets@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
diff --git a/arch/x86/kvm/vmx/nested.c b/arch/x86/kvm/vmx/nested.c
index 9c74a73..bcb5072 100644
--- a/arch/x86/kvm/vmx/nested.c
+++ b/arch/x86/kvm/vmx/nested.c
@@ -4624,19 +4624,24 @@ void nested_vmx_pmu_entry_exit_ctls_update(struct kvm_vcpu *vcpu)
}
}
-static int nested_vmx_get_vmptr(struct kvm_vcpu *vcpu, gpa_t *vmpointer)
+static int nested_vmx_get_vmptr(struct kvm_vcpu *vcpu, gpa_t *vmpointer,
+ int *ret)
{
gva_t gva;
struct x86_exception e;
+ int r;
if (get_vmx_mem_address(vcpu, vmx_get_exit_qual(vcpu),
vmcs_read32(VMX_INSTRUCTION_INFO), false,
- sizeof(*vmpointer), &gva))
- return 1;
+ sizeof(*vmpointer), &gva)) {
+ *ret = 1;
+ return -EINVAL;
+ }
- if (kvm_read_guest_virt(vcpu, gva, vmpointer, sizeof(*vmpointer), &e)) {
- kvm_inject_emulated_page_fault(vcpu, &e);
- return 1;
+ r = kvm_read_guest_virt(vcpu, gva, vmpointer, sizeof(*vmpointer), &e);
+ if (r != X86EMUL_CONTINUE) {
+ *ret = vmx_handle_memory_failure(vcpu, r, &e);
+ return -EINVAL;
}
return 0;
@@ -4764,8 +4769,8 @@ static int handle_vmon(struct kvm_vcpu *vcpu)
return 1;
}
- if (nested_vmx_get_vmptr(vcpu, &vmptr))
- return 1;
+ if (nested_vmx_get_vmptr(vcpu, &vmptr, &ret))
+ return ret;
/*
* SDM 3: 24.11.5
@@ -4838,12 +4843,13 @@ static int handle_vmclear(struct kvm_vcpu *vcpu)
u32 zero = 0;
gpa_t vmptr;
u64 evmcs_gpa;
+ int r;
if (!nested_vmx_check_permission(vcpu))
return 1;
- if (nested_vmx_get_vmptr(vcpu, &vmptr))
- return 1;
+ if (nested_vmx_get_vmptr(vcpu, &vmptr, &r))
+ return r;
if (!page_address_valid(vcpu, vmptr))
return nested_vmx_failValid(vcpu,
@@ -4902,7 +4908,7 @@ static int handle_vmread(struct kvm_vcpu *vcpu)
u64 value;
gva_t gva = 0;
short offset;
- int len;
+ int len, r;
if (!nested_vmx_check_permission(vcpu))
return 1;
@@ -4943,10 +4949,9 @@ static int handle_vmread(struct kvm_vcpu *vcpu)
instr_info, true, len, &gva))
return 1;
/* _system ok, nested_vmx_check_permission has verified cpl=0 */
- if (kvm_write_guest_virt_system(vcpu, gva, &value, len, &e)) {
- kvm_inject_emulated_page_fault(vcpu, &e);
- return 1;
- }
+ r = kvm_write_guest_virt_system(vcpu, gva, &value, len, &e);
+ if (r != X86EMUL_CONTINUE)
+ return vmx_handle_memory_failure(vcpu, r, &e);
}
return nested_vmx_succeed(vcpu);
@@ -4987,7 +4992,7 @@ static int handle_vmwrite(struct kvm_vcpu *vcpu)
unsigned long field;
short offset;
gva_t gva;
- int len;
+ int len, r;
/*
* The value to write might be 32 or 64 bits, depending on L1's long
@@ -5017,10 +5022,9 @@ static int handle_vmwrite(struct kvm_vcpu *vcpu)
if (get_vmx_mem_address(vcpu, exit_qualification,
instr_info, false, len, &gva))
return 1;
- if (kvm_read_guest_virt(vcpu, gva, &value, len, &e)) {
- kvm_inject_emulated_page_fault(vcpu, &e);
- return 1;
- }
+ r = kvm_read_guest_virt(vcpu, gva, &value, len, &e);
+ if (r != X86EMUL_CONTINUE)
+ return vmx_handle_memory_failure(vcpu, r, &e);
}
field = kvm_register_readl(vcpu, (((instr_info) >> 28) & 0xf));
@@ -5103,12 +5107,13 @@ static int handle_vmptrld(struct kvm_vcpu *vcpu)
{
struct vcpu_vmx *vmx = to_vmx(vcpu);
gpa_t vmptr;
+ int r;
if (!nested_vmx_check_permission(vcpu))
return 1;
- if (nested_vmx_get_vmptr(vcpu, &vmptr))
- return 1;
+ if (nested_vmx_get_vmptr(vcpu, &vmptr, &r))
+ return r;
if (!page_address_valid(vcpu, vmptr))
return nested_vmx_failValid(vcpu,
@@ -5170,6 +5175,7 @@ static int handle_vmptrst(struct kvm_vcpu *vcpu)
gpa_t current_vmptr = to_vmx(vcpu)->nested.current_vmptr;
struct x86_exception e;
gva_t gva;
+ int r;
if (!nested_vmx_check_permission(vcpu))
return 1;
@@ -5181,11 +5187,11 @@ static int handle_vmptrst(struct kvm_vcpu *vcpu)
true, sizeof(gpa_t), &gva))
return 1;
/* *_system ok, nested_vmx_check_permission has verified cpl=0 */
- if (kvm_write_guest_virt_system(vcpu, gva, (void *)¤t_vmptr,
- sizeof(gpa_t), &e)) {
- kvm_inject_emulated_page_fault(vcpu, &e);
- return 1;
- }
+ r = kvm_write_guest_virt_system(vcpu, gva, (void *)¤t_vmptr,
+ sizeof(gpa_t), &e);
+ if (r != X86EMUL_CONTINUE)
+ return vmx_handle_memory_failure(vcpu, r, &e);
+
return nested_vmx_succeed(vcpu);
}
@@ -5209,7 +5215,7 @@ static int handle_invept(struct kvm_vcpu *vcpu)
struct {
u64 eptp, gpa;
} operand;
- int i;
+ int i, r;
if (!(vmx->nested.msrs.secondary_ctls_high &
SECONDARY_EXEC_ENABLE_EPT) ||
@@ -5236,10 +5242,9 @@ static int handle_invept(struct kvm_vcpu *vcpu)
if (get_vmx_mem_address(vcpu, vmx_get_exit_qual(vcpu),
vmx_instruction_info, false, sizeof(operand), &gva))
return 1;
- if (kvm_read_guest_virt(vcpu, gva, &operand, sizeof(operand), &e)) {
- kvm_inject_emulated_page_fault(vcpu, &e);
- return 1;
- }
+ r = kvm_read_guest_virt(vcpu, gva, &operand, sizeof(operand), &e);
+ if (r != X86EMUL_CONTINUE)
+ return vmx_handle_memory_failure(vcpu, r, &e);
/*
* Nested EPT roots are always held through guest_mmu,
@@ -5291,6 +5296,7 @@ static int handle_invvpid(struct kvm_vcpu *vcpu)
u64 gla;
} operand;
u16 vpid02;
+ int r;
if (!(vmx->nested.msrs.secondary_ctls_high &
SECONDARY_EXEC_ENABLE_VPID) ||
@@ -5318,10 +5324,10 @@ static int handle_invvpid(struct kvm_vcpu *vcpu)
if (get_vmx_mem_address(vcpu, vmx_get_exit_qual(vcpu),
vmx_instruction_info, false, sizeof(operand), &gva))
return 1;
- if (kvm_read_guest_virt(vcpu, gva, &operand, sizeof(operand), &e)) {
- kvm_inject_emulated_page_fault(vcpu, &e);
- return 1;
- }
+ r = kvm_read_guest_virt(vcpu, gva, &operand, sizeof(operand), &e);
+ if (r != X86EMUL_CONTINUE)
+ return vmx_handle_memory_failure(vcpu, r, &e);
+
if (operand.vpid >> 16)
return nested_vmx_failValid(vcpu,
VMXERR_INVALID_OPERAND_TO_INVEPT_INVVPID);