XRRQueryVersion: add test for XQueryExtension overflowHEADmaster

Tests for Xlib CVE-2023-3138 by returning out-of-range values for
the extension's first_event and first_error codes.

Signed-off-by: Alan Coopersmith <alan.coopersmith@oracle.com>

1 files changed, 77 insertions, 0 deletions

diff --git a/tests/libXrandr/XRRQueryVersion.c b/tests/libXrandr/XRRQueryVersion.c
new file mode 100644
index 0000000..f9e023d
--- /dev/null
+++ b/tests/libXrandr/XRRQueryVersion.c
@@ -0,0 +1,77 @@
+/*
+ * Copyright (c) 2013, 2023, Oracle and/or its affiliates.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+#ifdef HAVE_CONFIG_H
+# include "config.h"
+#endif
+
+#include "xhiv.h"
+#include <X11/Xlib.h>
+#include <X11/Xlibint.h>
+#include "xhiv-Xrandr.h"
+#include <assert.h>
+#include <stdio.h>
+#include <limits.h>
+
+static void
+testOverflowFields(void)
+{
+    const xQueryExtensionReply overflow_xrandr_qext_reply = {
+        .type = X_Reply,
+        .length = 0,
+        .present = xTrue,
+        .major_opcode = MY_XRANDR_EXT_CODE,
+        .first_event = 255, /* Only events < 128 are allowed in protocol */
+        .first_error = 255
+    };
+    Display *dpy, *saved_dpy;
+    int major = MY_XRANDR_MAJOR_VERSION;
+    int minor = MY_XRANDR_MINOR_VERSION;
+    int status;
+
+    xrandr_qext_response.response_data = &overflow_xrandr_qext_reply;
+
+    dpy = XhivOpenDisplay(&xrandr_vers_response);
+    saved_dpy = calloc(1, sizeof(Display));
+    assert(saved_dpy != NULL);
+    memcpy(saved_dpy, dpy, sizeof(Display));
+
+    printf("XRRQueryVersion: overflow event id test\n");
+    status = XRRQueryVersion(dpy, &major, &minor);
+    assert(status != 0);
+    /* check that event_vec didn't overflow into wire_vec */
+    for (int i = 0 ; i < 127; i++) {
+        assert(dpy->wire_vec[i] == saved_dpy->wire_vec[i]);
+    }
+    /* check that wire_vec didn't overflow into following field */
+    assert(dpy->lock_meaning == saved_dpy->lock_meaning);
+
+    XhivCloseDisplay(dpy);
+}
+
+int
+main(int argc, char **argv)
+{
+    testOverflowFields();
+    printf("XRRQueryVersion: all tests passed\n");
+    return 0;
+}