... to avoid buggy read/write sizes becoming info leaks.
Signed-off-by: Jan Beulich <jbeul...@suse.com>
--- 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 )
{
x86emul: always init mmval
... to avoid buggy read/write sizes becoming info leaks.
Signed-off-by: Jan Beulich <jbeul...@suse.com>
--- 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 )
{
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