mirrors/linux-stable
1
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git synced 2024-09-22 18:41:06 +00:00
Code Issues Releases Wiki Activity

KVM: x86: Set error code to segment selector on LLDT/LTR non-canonical #GP

Browse source 
commit 2626206963 upstream.

When injecting a #GP on LLDT/LTR due to a non-canonical LDT/TSS base, set
the error code to the selector.  Intel SDM's says nothing about the #GP,
but AMD's APM explicitly states that both LLDT and LTR set the error code
to the selector, not zero.

Note, a non-canonical memory operand on LLDT/LTR does generate a #GP(0),
but the KVM code in question is specific to the base from the descriptor.

Fixes: e37a75a13c ("KVM: x86: Emulator ignores LDTR/TR extended base on LLDT/LTR")
Cc: stable@vger.kernel.org
Signed-off-by: Sean Christopherson <seanjc@google.com>
Reviewed-by: Maxim Levitsky <mlevitsk@redhat.com>
Link: https://lore.kernel.org/r/20220711232750.1092012-3-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Sean Christopherson 2022-07-11 23:27:49 +00:00 committed by Greg Kroah-Hartman
parent ccbf3f955c
commit 14aebe952f
1 changed files with 2 additions and 2 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

4
arch/x86/kvm/emulate.c
View file

@ -1706,8 +1706,8 @@ static int __load_segment_descriptor(struct x86_emulate_ctxt *ctxt,
if (ret != X86EMUL_CONTINUE)
return ret;
if (emul_is_noncanonical_address(get_desc_base(&seg_desc) |
((u64)base3 << 32), ctxt))
return emulate_gp(ctxt, 0);
((u64)base3 << 32), ctxt))
return emulate_gp(ctxt, err_code);
}
if (seg == VCPU_SREG_TR) {