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authorSteve Rutherford <srutherford@google.com>2017-01-11 18:28:29 -0800
committerPaolo Bonzini <pbonzini@redhat.com>2017-01-12 14:34:58 +0100
commit129a72a0d3c8e139a04512325384fe5ac119e74d (patch)
tree56a0adfdeff6c007ba3a5f36577036f20e7d5150 /virt/lib
parentcef84c302fe051744b983a92764d3fcca933415d (diff)
KVM: x86: Introduce segmented_write_std
Introduces segemented_write_std. Switches from emulated reads/writes to standard read/writes in fxsave, fxrstor, sgdt, and sidt. This fixes CVE-2017-2584, a longstanding kernel memory leak. Since commit 283c95d0e389 ("KVM: x86: emulate FXSAVE and FXRSTOR", 2016-11-09), which is luckily not yet in any final release, this would also be an exploitable kernel memory *write*! Reported-by: Dmitry Vyukov <dvyukov@google.com> Cc: stable@vger.kernel.org Fixes: 96051572c819194c37a8367624b285be10297eca Fixes: 283c95d0e3891b64087706b344a4b545d04a6e62 Suggested-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Steve Rutherford <srutherford@google.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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