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| author | Nadav Amit <namit@cs.technion.ac.il> | 2014-10-27 23:03:43 +0100 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2014-11-02 07:54:55 +0100 |
| commit | 7e46dddd6f6cd5dbf3c7bd04a7e75d19475ac9f2 (patch) | |
| tree | 5c374dad5036d05134f833c10073bc89a0f85657 /arch/alpha/defconfig | |
| parent | KVM: emulator: fix execution close to the segment limit (diff) | |
| download | linux-7e46dddd6f6cd5dbf3c7bd04a7e75d19475ac9f2.tar.xz linux-7e46dddd6f6cd5dbf3c7bd04a7e75d19475ac9f2.zip | |
KVM: x86: Fix far-jump to non-canonical check
Commit d1442d85cc30 ("KVM: x86: Handle errors when RIP is set during far
jumps") introduced a bug that caused the fix to be incomplete. Due to
incorrect evaluation, far jump to segment with L bit cleared (i.e., 32-bit
segment) and RIP with any of the high bits set (i.e, RIP[63:32] != 0) set may
not trigger #GP. As we know, this imposes a security problem.
In addition, the condition for two warnings was incorrect.
Fixes: d1442d85cc30ea75f7d399474ca738e0bc96f715
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Nadav Amit <namit@cs.technion.ac.il>
[Add #ifdef CONFIG_X86_64 to avoid complaints of undefined behavior. - Paolo]
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch/alpha/defconfig')
0 files changed, 0 insertions, 0 deletions