[NTOS:KE] Fix stack memory disclosure in KiInitializeUserApc (#2988)

diff --git a/ntoskrnl/ke/amd64/stubs.c b/ntoskrnl/ke/amd64/stubs.c
index 9f8ed16..43117fe 100644 (file)
--- a/ntoskrnl/ke/amd64/stubs.c
+++ b/ntoskrnl/ke/amd64/stubs.c
@@ -207,7 +207,7 @@ KiInitializeUserApc(IN PKEXCEPTION_FRAME ExceptionFrame,
                     IN PVOID SystemArgument1,
                     IN PVOID SystemArgument2)
 {
-    CONTEXT Context;
+    CONTEXT Context = { 0 };
     ULONG64 AlignedRsp, Stack;
     EXCEPTION_RECORD SehExceptRecord;
 

diff --git a/ntoskrnl/ke/arm/usercall.c b/ntoskrnl/ke/arm/usercall.c
index 1895c2c..c98ff55 100644 (file)
--- a/ntoskrnl/ke/arm/usercall.c
+++ b/ntoskrnl/ke/arm/usercall.c
@@ -270,7 +270,7 @@ KiInitializeUserApc(IN PKEXCEPTION_FRAME ExceptionFrame,
                     IN PVOID SystemArgument1,
                     IN PVOID SystemArgument2)
 {
-    CONTEXT Context;
+    CONTEXT Context = { 0 };
     ULONG_PTR Stack;
     ULONG ContextLength;
     DPRINT1("User APC: %p %p %p\n", NormalContext, SystemArgument1, SystemArgument2);

diff --git a/ntoskrnl/ke/i386/usercall.c b/ntoskrnl/ke/i386/usercall.c
index 8f59f7d..da99b0e 100644 (file)
--- a/ntoskrnl/ke/i386/usercall.c
+++ b/ntoskrnl/ke/i386/usercall.c
@@ -51,7 +51,7 @@ KiInitializeUserApc(IN PKEXCEPTION_FRAME ExceptionFrame,
                     IN PVOID SystemArgument1,
                     IN PVOID SystemArgument2)
 {
-    CONTEXT Context;
+    CONTEXT Context = { 0 };
     ULONG_PTR Stack, AlignedEsp;
     ULONG ContextLength;
     EXCEPTION_RECORD SehExceptRecord;