[PATCH v2] x86/sev: Initialize ctxt variable and zero fi
From: Ragavendra
Date: Mon Nov 18 2024 - 17:59:13 EST
Updating the ctxt value to {} in the svsm_perform_ghcb_protocol as
it was not initialized. Updating memory to zero for the ctxt->fi
variable in verify_exception_info when ES_EXCEPTION is returned.
Fixes: 34ff65901735 x86/sev: Use kernel provided SVSM Calling Areas
Signed-off-by: Ragavendra Nagraj <ragavendra.bn@xxxxxxxxx>
---
arch/x86/coco/sev/shared.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/arch/x86/coco/sev/shared.c b/arch/x86/coco/sev/shared.c
index 71de53194089..5e0f6fbf4dd2 100644
--- a/arch/x86/coco/sev/shared.c
+++ b/arch/x86/coco/sev/shared.c
@@ -239,6 +239,8 @@ static enum es_result verify_exception_info(struct ghcb *ghcb, struct es_em_ctxt
if ((info & SVM_EVTINJ_VALID) &&
((v == X86_TRAP_GP) || (v == X86_TRAP_UD)) &&
((info & SVM_EVTINJ_TYPE_MASK) == SVM_EVTINJ_TYPE_EXEPT)) {
+ memset(&ctxt->fi, 0, sizeof(ctxt->fi));
+
ctxt->fi.vector = v;
if (info & SVM_EVTINJ_VALID_ERR)
@@ -335,7 +337,7 @@ static int svsm_perform_msr_protocol(struct svsm_call *call)
static int svsm_perform_ghcb_protocol(struct ghcb *ghcb, struct svsm_call *call)
{
- struct es_em_ctxt ctxt;
+ struct es_em_ctxt ctxt = {};
u8 pending = 0;
vc_ghcb_invalidate(ghcb);
--
2.46.1