[Xen-changelog] [xen master] x86emul: always init mmval

[patchbot@xxxxxxx]

commit b857b041ee73d24fefa2dce55d23e2ff97306af2
Author:     Jan Beulich <jbeulich@xxxxxxxx>
AuthorDate: Mon Feb 13 15:20:55 2017 +0100
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Mon Feb 13 15:20:55 2017 +0100

    x86emul: always init mmval
    
    ... to avoid buggy read/write sizes becoming info leaks.
    
    Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
    Reviewed-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
---
 xen/arch/x86/x86_emulate/x86_emulate.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/xen/arch/x86/x86_emulate/x86_emulate.c 
b/xen/arch/x86/x86_emulate/x86_emulate.c
index 270b5c6..6cd9487 100644
--- a/xen/arch/x86/x86_emulate/x86_emulate.c
+++ b/xen/arch/x86/x86_emulate/x86_emulate.c
@@ -2671,6 +2671,8 @@ x86_emulate(
         ea.reg = decode_register(modrm_rm, &_regs,
                                  (d & ByteOp) && !rex_prefix);
 
+    memset(mmvalp, 0xaa /* arbitrary */, sizeof(*mmvalp));
+
     /* Decode and fetch the source operand: register, memory or immediate. */
     switch ( d & SrcMask )
     {
--
generated by git-patchbot for /home/xen/git/xen.git#master

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