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Miscellaneous bugfixes. The main interesting one is a NULL pointer dereference 

reported by syzkaller ("KVM: x86: Immediately reset the MMU context when the SMM
 flag is cleared").
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Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm

Pull kvm fixes from Paolo Bonzini:
 "Miscellaneous bugfixes.

  The main interesting one is a NULL pointer dereference reported by
  syzkaller ("KVM: x86: Immediately reset the MMU context when the SMM
  flag is cleared")"

* tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm:
  KVM: selftests: Fix kvm_check_cap() assertion
  KVM: x86/mmu: Calculate and check "full" mmu_role for nested MMU
  KVM: X86: Fix x86_emulator slab cache leak
  KVM: SVM: Call SEV Guest Decommission if ASID binding fails
  KVM: x86: Immediately reset the MMU context when the SMM flag is cleared
  KVM: x86: Fix fall-through warnings for Clang
  KVM: SVM: fix doc warnings
  KVM: selftests: Fix compiling errors when initializing the static structure
  kvm: LAPIC: Restore guard to prevent illegal APIC register access
This commit is contained in:
Linus Torvalds 2021-06-17 13:14:53 -07:00
parent 39519f6a56 d8ac05ea13
commit fd0aa1a456
9 changed files with 73 additions and 30 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
arch/x86/kvm/cpuid.c
View File

@ -655,6 +655,7 @@ static int __do_cpuid_func_emulated(struct kvm_cpuid_array *array, u32 func)
if (kvm_cpu_cap_has(X86_FEATURE_RDTSCP))
entry->ecx = F(RDPID);
++array->nent;
break;
default:
break;
}

3
arch/x86/kvm/lapic.c
View File

@ -1410,6 +1410,9 @@ int kvm_lapic_reg_read(struct kvm_lapic *apic, u32 offset, int len,
if (!apic_x2apic_mode(apic))
valid_reg_mask |= APIC_REG_MASK(APIC_ARBPRI);
if (alignment + len > 4)
return 1;
if (offset > 0x3f0 || !(valid_reg_mask & APIC_REG_MASK(offset)))
return 1;

26
arch/x86/kvm/mmu/mmu.c
View File

@ -4739,9 +4739,33 @@ static void init_kvm_softmmu(struct kvm_vcpu *vcpu)
context->inject_page_fault = kvm_inject_page_fault;
}
static union kvm_mmu_role kvm_calc_nested_mmu_role(struct kvm_vcpu *vcpu)
{
union kvm_mmu_role role = kvm_calc_shadow_root_page_role_common(vcpu, false);
/*
* Nested MMUs are used only for walking L2's gva->gpa, they never have
* shadow pages of their own and so "direct" has no meaning. Set it
* to "true" to try to detect bogus usage of the nested MMU.
*/
role.base.direct = true;
if (!is_paging(vcpu))
role.base.level = 0;
else if (is_long_mode(vcpu))
role.base.level = is_la57_mode(vcpu) ? PT64_ROOT_5LEVEL :
PT64_ROOT_4LEVEL;
else if (is_pae(vcpu))
role.base.level = PT32E_ROOT_LEVEL;
else
role.base.level = PT32_ROOT_LEVEL;
return role;
}
static void init_kvm_nested_mmu(struct kvm_vcpu *vcpu)
{
union kvm_mmu_role new_role = kvm_calc_mmu_role_common(vcpu, false);
union kvm_mmu_role new_role = kvm_calc_nested_mmu_role(vcpu);
struct kvm_mmu *g_context = &vcpu->arch.nested_mmu;
if (new_role.as_u64 == g_context->mmu_role.as_u64)

6
arch/x86/kvm/svm/avic.c
View File

@ -221,7 +221,7 @@ static u64 *avic_get_physical_id_entry(struct kvm_vcpu *vcpu,
return &avic_physical_id_table[index];
}
/**
/*
* Note:
* AVIC hardware walks the nested page table to check permissions,
* but does not use the SPA address specified in the leaf page
@ -764,7 +764,7 @@ out:
return ret;
}
/**
/*
* Note:
* The HW cannot support posting multicast/broadcast
* interrupts to a vCPU. So, we still use legacy interrupt
@ -1005,7 +1005,7 @@ void avic_vcpu_put(struct kvm_vcpu *vcpu)
WRITE_ONCE(*(svm->avic_physical_id_cache), entry);
}
/**
/*
* This function is called during VCPU halt/unhalt.
*/
static void avic_set_running(struct kvm_vcpu *vcpu, bool is_run)

20
arch/x86/kvm/svm/sev.c
View File

@ -199,9 +199,19 @@ static void sev_asid_free(struct kvm_sev_info *sev)
sev->misc_cg = NULL;
}
static void sev_unbind_asid(struct kvm *kvm, unsigned int handle)
static void sev_decommission(unsigned int handle)
{
struct sev_data_decommission decommission;
if (!handle)
return;
decommission.handle = handle;
sev_guest_decommission(&decommission, NULL);
}
static void sev_unbind_asid(struct kvm *kvm, unsigned int handle)
{
struct sev_data_deactivate deactivate;
if (!handle)
@ -214,9 +224,7 @@ static void sev_unbind_asid(struct kvm *kvm, unsigned int handle)
sev_guest_deactivate(&deactivate, NULL);
up_read(&sev_deactivate_lock);
/* decommission handle */
decommission.handle = handle;
sev_guest_decommission(&decommission, NULL);
sev_decommission(handle);
}
static int sev_guest_init(struct kvm *kvm, struct kvm_sev_cmd *argp)
@ -341,8 +349,10 @@ static int sev_launch_start(struct kvm *kvm, struct kvm_sev_cmd *argp)
/* Bind ASID to this guest */
ret = sev_bind_asid(kvm, start.handle, error);
if (ret)
if (ret) {
sev_decommission(start.handle);
goto e_free_session;
}
/* return handle to userspace */
params.handle = start.handle;

1
arch/x86/kvm/vmx/vmx.c
View File

@ -6247,6 +6247,7 @@ void vmx_set_virtual_apic_mode(struct kvm_vcpu *vcpu)
switch (kvm_get_apic_mode(vcpu)) {
case LAPIC_MODE_INVALID:
WARN_ONCE(true, "Invalid local APIC state");
break;
case LAPIC_MODE_DISABLED:
break;
case LAPIC_MODE_XAPIC:

6
arch/x86/kvm/x86.c
View File

@ -7106,7 +7106,10 @@ static unsigned emulator_get_hflags(struct x86_emulate_ctxt *ctxt)
static void emulator_set_hflags(struct x86_emulate_ctxt *ctxt, unsigned emul_flags)
{
emul_to_vcpu(ctxt)->arch.hflags = emul_flags;
struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt);
vcpu->arch.hflags = emul_flags;
kvm_mmu_reset_context(vcpu);
}
static int emulator_pre_leave_smm(struct x86_emulate_ctxt *ctxt,
@ -8258,6 +8261,7 @@ void kvm_arch_exit(void)
kvm_x86_ops.hardware_enable = NULL;
kvm_mmu_module_exit();
free_percpu(user_return_msrs);
kmem_cache_destroy(x86_emulator_cache);
kmem_cache_destroy(x86_fpu_cache);
#ifdef CONFIG_KVM_XEN
static_key_deferred_flush(&kvm_xen_enabled);

2
tools/testing/selftests/kvm/lib/kvm_util.c
View File

@ -82,7 +82,7 @@ int kvm_check_cap(long cap)
kvm_fd = open_kvm_dev_path_or_exit();
ret = ioctl(kvm_fd, KVM_CHECK_EXTENSION, cap);
TEST_ASSERT(ret != -1, "KVM_CHECK_EXTENSION IOCTL failed,\n"
TEST_ASSERT(ret >= 0, "KVM_CHECK_EXTENSION IOCTL failed,\n"
" rc: %i errno: %i", ret, errno);
close(kvm_fd);

38
tools/testing/selftests/kvm/lib/test_util.c
View File

@ -166,75 +166,75 @@ size_t get_def_hugetlb_pagesz(void)
return 0;
}
#define ANON_FLAGS (MAP_PRIVATE | MAP_ANONYMOUS)
#define ANON_HUGE_FLAGS (ANON_FLAGS | MAP_HUGETLB)
const struct vm_mem_backing_src_alias *vm_mem_backing_src_alias(uint32_t i)
{
static const int anon_flags = MAP_PRIVATE | MAP_ANONYMOUS;
static const int anon_huge_flags = anon_flags | MAP_HUGETLB;
static const struct vm_mem_backing_src_alias aliases[] = {
[VM_MEM_SRC_ANONYMOUS] = {
.name = "anonymous",
.flag = anon_flags,
.flag = ANON_FLAGS,
},
[VM_MEM_SRC_ANONYMOUS_THP] = {
.name = "anonymous_thp",
.flag = anon_flags,
.flag = ANON_FLAGS,
},
[VM_MEM_SRC_ANONYMOUS_HUGETLB] = {
.name = "anonymous_hugetlb",
.flag = anon_huge_flags,
.flag = ANON_HUGE_FLAGS,
},
[VM_MEM_SRC_ANONYMOUS_HUGETLB_16KB] = {
.name = "anonymous_hugetlb_16kb",
.flag = anon_huge_flags | MAP_HUGE_16KB,
.flag = ANON_HUGE_FLAGS | MAP_HUGE_16KB,
},
[VM_MEM_SRC_ANONYMOUS_HUGETLB_64KB] = {
.name = "anonymous_hugetlb_64kb",
.flag = anon_huge_flags | MAP_HUGE_64KB,
.flag = ANON_HUGE_FLAGS | MAP_HUGE_64KB,
},
[VM_MEM_SRC_ANONYMOUS_HUGETLB_512KB] = {
.name = "anonymous_hugetlb_512kb",
.flag = anon_huge_flags | MAP_HUGE_512KB,
.flag = ANON_HUGE_FLAGS | MAP_HUGE_512KB,
},
[VM_MEM_SRC_ANONYMOUS_HUGETLB_1MB] = {
.name = "anonymous_hugetlb_1mb",
.flag = anon_huge_flags | MAP_HUGE_1MB,
.flag = ANON_HUGE_FLAGS | MAP_HUGE_1MB,
},
[VM_MEM_SRC_ANONYMOUS_HUGETLB_2MB] = {
.name = "anonymous_hugetlb_2mb",
.flag = anon_huge_flags | MAP_HUGE_2MB,
.flag = ANON_HUGE_FLAGS | MAP_HUGE_2MB,
},
[VM_MEM_SRC_ANONYMOUS_HUGETLB_8MB] = {
.name = "anonymous_hugetlb_8mb",
.flag = anon_huge_flags | MAP_HUGE_8MB,
.flag = ANON_HUGE_FLAGS | MAP_HUGE_8MB,
},
[VM_MEM_SRC_ANONYMOUS_HUGETLB_16MB] = {
.name = "anonymous_hugetlb_16mb",
.flag = anon_huge_flags | MAP_HUGE_16MB,
.flag = ANON_HUGE_FLAGS | MAP_HUGE_16MB,
},
[VM_MEM_SRC_ANONYMOUS_HUGETLB_32MB] = {
.name = "anonymous_hugetlb_32mb",
.flag = anon_huge_flags | MAP_HUGE_32MB,
.flag = ANON_HUGE_FLAGS | MAP_HUGE_32MB,
},
[VM_MEM_SRC_ANONYMOUS_HUGETLB_256MB] = {
.name = "anonymous_hugetlb_256mb",
.flag = anon_huge_flags | MAP_HUGE_256MB,
.flag = ANON_HUGE_FLAGS | MAP_HUGE_256MB,
},
[VM_MEM_SRC_ANONYMOUS_HUGETLB_512MB] = {
.name = "anonymous_hugetlb_512mb",
.flag = anon_huge_flags | MAP_HUGE_512MB,
.flag = ANON_HUGE_FLAGS | MAP_HUGE_512MB,
},
[VM_MEM_SRC_ANONYMOUS_HUGETLB_1GB] = {
.name = "anonymous_hugetlb_1gb",
.flag = anon_huge_flags | MAP_HUGE_1GB,
.flag = ANON_HUGE_FLAGS | MAP_HUGE_1GB,
},
[VM_MEM_SRC_ANONYMOUS_HUGETLB_2GB] = {
.name = "anonymous_hugetlb_2gb",
.flag = anon_huge_flags | MAP_HUGE_2GB,
.flag = ANON_HUGE_FLAGS | MAP_HUGE_2GB,
},
[VM_MEM_SRC_ANONYMOUS_HUGETLB_16GB] = {
.name = "anonymous_hugetlb_16gb",
.flag = anon_huge_flags | MAP_HUGE_16GB,
.flag = ANON_HUGE_FLAGS | MAP_HUGE_16GB,
},
[VM_MEM_SRC_SHMEM] = {
.name = "shmem",