diff options
| author | Sean Christopherson <seanjc@google.com> | 2021-11-04 00:25:02 +0000 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2021-11-18 02:15:19 -0500 |
| commit | bda44d844758c70c8dc1478e6fc9c25efa90c5a7 (patch) | |
| tree | 07ad02921f801906d9ff13c5d9e53a91d88231ff /security | |
| parent | 574c3c55e969096cea770eda3375ff35ccf91702 (diff) | |
KVM: Ensure local memslot copies operate on up-to-date arch-specific data
When modifying memslots, snapshot the "old" memslot and copy it to the
"new" memslot's arch data after (re)acquiring slots_arch_lock. x86 can
change a memslot's arch data while memslot updates are in-progress so
long as it holds slots_arch_lock, thus snapshotting a memslot without
holding the lock can result in the consumption of stale data.
Fixes: b10a038e84d1 ("KVM: mmu: Add slots_arch_lock for memslot arch fields")
Cc: stable@vger.kernel.org
Cc: Ben Gardon <bgardon@google.com>
Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20211104002531.1176691-2-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'security')
0 files changed, 0 insertions, 0 deletions