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| author | Sean Christopherson <sean.j.christopherson@intel.com> | 2020-03-02 15:56:08 -0800 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2020-03-16 17:57:57 +0100 |
| commit | 0fc62671876c29a80c16d41cbce782ff10795bef (patch) | |
| tree | dbd82c8956f872b326b101d1bbbfd75af3e26025 /tools/perf/scripts/python | |
| parent | KVM: x86: Clean up error handling in kvm_dev_ioctl_get_cpuid() (diff) | |
| download | linux-0fc62671876c29a80c16d41cbce782ff10795bef.tar.gz linux-0fc62671876c29a80c16d41cbce782ff10795bef.zip | |
KVM: x86: Check userspace CPUID array size after validating sub-leaf
Verify that the next sub-leaf of CPUID 0x4 (or 0x8000001d) is valid
before rejecting the entire KVM_GET_SUPPORTED_CPUID due to insufficent
space in the userspace array.
Note, although this is technically a bug, it's not visible to userspace
as KVM_GET_SUPPORTED_CPUID is guaranteed to fail on KVM_CPUID_SIGNATURE,
which is hardcoded to be added after the affected leafs. The real
motivation for the change is to tightly couple the nent/maxnent and
do_host_cpuid() sequences in preparation for future cleanup.
Reviewed-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'tools/perf/scripts/python')
0 files changed, 0 insertions, 0 deletions