ntdll: Do not use extended context in RtlCopyContext() if extended state is not copied.

dlls/ntdll/exception.c

@@ -994,6 +994,7 @@ NTSTATUS WINAPI RtlCopyContext( CONTEXT *dst, DWORD context_flags, CONTEXT *src
 {
     DWORD context_size, arch_flag, flags_offset, dst_flags, src_flags;
     static const DWORD arch_mask = CONTEXT_i386 | CONTEXT_AMD64;
+    const struct context_parameters *p;
     BYTE *d, *s;
 
     TRACE("dst %p, context_flags %#lx, src %p.\n", dst, context_flags, src);
@@ -1026,8 +1027,15 @@ NTSTATUS WINAPI RtlCopyContext( CONTEXT *dst, DWORD context_flags, CONTEXT *src
     context_flags &= src_flags;
     if (context_flags & ~dst_flags & 0x40) return STATUS_BUFFER_OVERFLOW;
 
+    if (context_flags & 0x40)
         return RtlCopyExtendedContext( (CONTEXT_EX *)(d + context_size), context_flags,
                                        (CONTEXT_EX *)(s + context_size) );
+
+    if (!(p = context_get_parameters( context_flags )))
+        return STATUS_INVALID_PARAMETER;
+
+    context_copy_ranges( d, context_flags, s, p );
+    return STATUS_SUCCESS;
 }
 
 

dlls/ntdll/tests/exception.c

@@ -10499,6 +10499,26 @@ static void test_copy_context(void)
 
     enabled_features = pRtlGetEnabledExtendedFeatures(~(ULONG64)0);
 
+    memset(dst_context_buffer, 0xdd, sizeof(dst_context_buffer));
+    memset(src_context_buffer, 0xcc, sizeof(src_context_buffer));
+
+    status = pRtlInitializeExtendedContext(src_context_buffer, CONTEXT_ALL | CONTEXT_XSTATE, &src_ex);
+    if (!status)
+    {
+        src = pRtlLocateLegacyContext(src_ex, NULL);
+        dst = (CONTEXT *)dst_context_buffer;
+        dst->ContextFlags = CONTEXT_ALL;
+        status = pRtlCopyContext(dst, dst->ContextFlags, src);
+        ok(!status, "Got status %#lx.\n", status);
+        check_changes_in_range((BYTE *)dst, CONTEXT_ALL & CONTEXT_AMD64 ? &ranges_amd64[0] : &ranges_x86[0],
+                CONTEXT_ALL, sizeof(CONTEXT));
+    }
+    else
+    {
+        ok(status == STATUS_NOT_SUPPORTED, "Got status %#lx.\n", status);
+        skip("Extended context is not supported.\n");
+    }
+
     for (i = 0; i < ARRAY_SIZE(tests); ++i)
     {
         flags = tests[i];