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author | Peter Gonda <pgonda@google.com> | 2021-01-27 19:15:24 +0300 |
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committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-02-13 15:51:15 +0300 |
commit | f1ecde00ce1694597f923f0d25f7a797c5243d99 (patch) | |
tree | 5f8902905e8a1008c51b0f2b5b5ccd5563e317c1 /drivers/hwtracing/coresight/coresight-tmc.c | |
parent | 050462f040b9cdb92b63f35aca76c6c873b0b5ab (diff) | |
download | linux-f1ecde00ce1694597f923f0d25f7a797c5243d99.tar.xz |
Fix unsynchronized access to sev members through svm_register_enc_region
commit 19a23da53932bc8011220bd8c410cb76012de004 upstream.
Grab kvm->lock before pinning memory when registering an encrypted
region; sev_pin_memory() relies on kvm->lock being held to ensure
correctness when checking and updating the number of pinned pages.
Add a lockdep assertion to help prevent future regressions.
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Joerg Roedel <joro@8bytes.org>
Cc: Tom Lendacky <thomas.lendacky@amd.com>
Cc: Brijesh Singh <brijesh.singh@amd.com>
Cc: Sean Christopherson <seanjc@google.com>
Cc: x86@kernel.org
Cc: kvm@vger.kernel.org
Cc: stable@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Fixes: 1e80fdc09d12 ("KVM: SVM: Pin guest memory when SEV is active")
Signed-off-by: Peter Gonda <pgonda@google.com>
V2
- Fix up patch description
- Correct file paths svm.c -> sev.c
- Add unlock of kvm->lock on sev_pin_memory error
V1
- https://lore.kernel.org/kvm/20210126185431.1824530-1-pgonda@google.com/
Message-Id: <20210127161524.2832400-1-pgonda@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/hwtracing/coresight/coresight-tmc.c')
0 files changed, 0 insertions, 0 deletions