Description
In the Linux kernel, the following vulnerability has been resolved: KVM: arm64: Reassign nested_mmus array behind mmu_lock kvm->arch.nested_mmus[] is walked under kvm->mmu_lock, including from the MMU notifier path (kvm_unmap_gfn_range() -> kvm_nested_s2_unmap()), which can run at any time. kvm_vcpu_init_nested() reallocates the array and frees the old buffer while holding only kvm->arch.config_lock, so such a walker can reference the freed array. Allocate the new array outside of mmu_lock, as the allocation can sleep. Under the lock, copy the existing entries, fix up the back pointers and reassign the array. Free the old buffer after dropping the lock, as kvfree() can sleep as well.
Product status
4f128f8e1aaac189f83d0f828bcdb2986d8d2e51 (git) before 918450ad6010df6ecd2efde12a1409e011da22d6
4f128f8e1aaac189f83d0f828bcdb2986d8d2e51 (git) before 4424dbcb06d68e34e51c019a5781a7dc00731971
4f128f8e1aaac189f83d0f828bcdb2986d8d2e51 (git) before 70543358fa08e0f7cebc3447c3b70fe97ad7aaa8
6.11
Any version before 6.11
6.18.35 (semver)
7.0.12 (semver)
7.1-rc7 (original_commit_for_fix)
References
git.kernel.org/...c/918450ad6010df6ecd2efde12a1409e011da22d6
git.kernel.org/...c/4424dbcb06d68e34e51c019a5781a7dc00731971
git.kernel.org/...c/70543358fa08e0f7cebc3447c3b70fe97ad7aaa8