From: Nadav Amit <namit@cs.technion.ac.il>
Date: Mon, 27 Oct 2014 22:03:43 +0000 (+0200)
Subject: KVM: x86: Fix far-jump to non-canonical check
X-Git-Tag: omap-for-v3.19/fixes-rc1~43^2~119
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=cd9b8e2c48b241be084dc794440e0e69267ef8e1;p=pandora-kernel.git

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.

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>
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