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| author | Paolo Bonzini <pbonzini@redhat.com> | 2017-03-27 17:53:50 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-03-31 10:33:42 +0200 |
| commit | 71a434f7c9b8dc2737926895f464c9b37dc72670 (patch) | |
| tree | 23b8c9388e353a7928101c673b04c7d852f43285 | |
| parent | 737f7378c7e926b04bb10def4459ec47c40a7ea2 (diff) | |
| download | linux-71a434f7c9b8dc2737926895f464c9b37dc72670.tar.gz linux-71a434f7c9b8dc2737926895f464c9b37dc72670.tar.bz2 linux-71a434f7c9b8dc2737926895f464c9b37dc72670.zip | |
KVM: x86: cleanup the page tracking SRCU instance
commit 2beb6dad2e8f95d710159d5befb390e4f62ab5cf upstream.
SRCU uses a delayed work item. Skip cleaning it up, and
the result is use-after-free in the work item callbacks.
Reported-by: Dmitry Vyukov <dvyukov@google.com>
Suggested-by: Dmitry Vyukov <dvyukov@google.com>
Fixes: 0eb05bf290cfe8610d9680b49abef37febd1c38a
Reviewed-by: Xiao Guangrong <xiaoguangrong.eric@gmail.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | arch/x86/include/asm/kvm_page_track.h | 1 | ||||
| -rw-r--r-- | arch/x86/kvm/page_track.c | 8 | ||||
| -rw-r--r-- | arch/x86/kvm/x86.c | 1 |
3 files changed, 10 insertions, 0 deletions
diff --git a/arch/x86/include/asm/kvm_page_track.h b/arch/x86/include/asm/kvm_page_track.h index d74747b031ec..c4eda791f877 100644 --- a/arch/x86/include/asm/kvm_page_track.h +++ b/arch/x86/include/asm/kvm_page_track.h @@ -46,6 +46,7 @@ struct kvm_page_track_notifier_node { }; void kvm_page_track_init(struct kvm *kvm); +void kvm_page_track_cleanup(struct kvm *kvm); void kvm_page_track_free_memslot(struct kvm_memory_slot *free, struct kvm_memory_slot *dont); diff --git a/arch/x86/kvm/page_track.c b/arch/x86/kvm/page_track.c index 4a1c13eaa518..c9473acd65d6 100644 --- a/arch/x86/kvm/page_track.c +++ b/arch/x86/kvm/page_track.c @@ -158,6 +158,14 @@ bool kvm_page_track_is_active(struct kvm_vcpu *vcpu, gfn_t gfn, return !!ACCESS_ONCE(slot->arch.gfn_track[mode][index]); } +void kvm_page_track_cleanup(struct kvm *kvm) +{ + struct kvm_page_track_notifier_head *head; + + head = &kvm->arch.track_notifier_head; + cleanup_srcu_struct(&head->track_srcu); +} + void kvm_page_track_init(struct kvm *kvm) { struct kvm_page_track_notifier_head *head; diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index e52c9088660f..b3b212f20f78 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -8052,6 +8052,7 @@ void kvm_arch_destroy_vm(struct kvm *kvm) kvm_free_vcpus(kvm); kvfree(rcu_dereference_check(kvm->arch.apic_map, 1)); kvm_mmu_uninit_vm(kvm); + kvm_page_track_cleanup(kvm); } void kvm_arch_free_memslot(struct kvm *kvm, struct kvm_memory_slot *free, |