References: bsc#965269 CVE-2015-8619

Subject: hmp: fix sendkey out of bounds write (CVE-2015-8619)
From: Wolfgang Bumiller w.bumiller@proxmox.com Wed Jan 13 09:09:58 2016 +0100
Date: Wed Feb 3 10:13:06 2016 +0100:
Git: 64ffbe04eaafebf4045a3ace52a360c14959d196

When processing 'sendkey' command, hmp_sendkey routine null
terminates the 'keyname_buf' array. This results in an OOB
write issue, if 'keyname_len' was to fall outside of
'keyname_buf' array.

Since the keyname's length is known the keyname_buf can be
removed altogether by adding a length parameter to
index_from_key() and using it for the error output as well.

Reported-by: Ling Liu <liuling-it@360.cn>
Signed-off-by: Wolfgang Bumiller <w.bumiller@proxmox.com>
Message-Id: <20160113080958.GA18934@olga>
[Comparison with "<" dumbed down, test for junk after strtoul()
tweaked]
Signed-off-by: Markus Armbruster <armbru@redhat.com>

Index: xen-4.6.0-testing/tools/qemu-xen-dir-remote/hmp.c
===================================================================
--- xen-4.6.0-testing.orig/tools/qemu-xen-dir-remote/hmp.c
+++ xen-4.6.0-testing/tools/qemu-xen-dir-remote/hmp.c
@@ -1478,21 +1478,18 @@ void hmp_send_key(Monitor *mon, const QD
     int has_hold_time = qdict_haskey(qdict, "hold-time");
     int hold_time = qdict_get_try_int(qdict, "hold-time", -1);
     Error *err = NULL;
-    char keyname_buf[16];
     char *separator;
     int keyname_len;
 
     while (1) {
         separator = strchr(keys, '-');
         keyname_len = separator ? separator - keys : strlen(keys);
-        pstrcpy(keyname_buf, sizeof(keyname_buf), keys);
 
         /* Be compatible with old interface, convert user inputted "<" */
-        if (!strncmp(keyname_buf, "<", 1) && keyname_len == 1) {
-            pstrcpy(keyname_buf, sizeof(keyname_buf), "less");
+        if (keys[0] == '<' && keyname_len == 1) {
+            keys = "less";
             keyname_len = 4;
         }
-        keyname_buf[keyname_len] = 0;
 
         keylist = g_malloc0(sizeof(*keylist));
         keylist->value = g_malloc0(sizeof(*keylist->value));
@@ -1505,16 +1502,17 @@ void hmp_send_key(Monitor *mon, const QD
         }
         tmp = keylist;
 
-        if (strstart(keyname_buf, "0x", NULL)) {
+        if (strstart(keys, "0x", NULL)) {
             char *endp;
-            int value = strtoul(keyname_buf, &endp, 0);
-            if (*endp != '\0') {
+            int value = strtoul(keys, &endp, 0);
+            assert(endp <= keys + keyname_len);
+            if (endp != keys + keyname_len) {
                 goto err_out;
             }
             keylist->value->kind = KEY_VALUE_KIND_NUMBER;
             keylist->value->number = value;
         } else {
-            int idx = index_from_key(keyname_buf);
+            int idx = index_from_key(keys, keyname_len);
             if (idx == Q_KEY_CODE_MAX) {
                 goto err_out;
             }
@@ -1536,7 +1534,7 @@ out:
     return;
 
 err_out:
-    monitor_printf(mon, "invalid parameter: %s\n", keyname_buf);
+    monitor_printf(mon, "invalid parameter: %.*s\n", keyname_len, keys);
     goto out;
 }
 
Index: xen-4.6.0-testing/tools/qemu-xen-dir-remote/include/ui/console.h
===================================================================
--- xen-4.6.0-testing.orig/tools/qemu-xen-dir-remote/include/ui/console.h
+++ xen-4.6.0-testing/tools/qemu-xen-dir-remote/include/ui/console.h
@@ -349,7 +349,7 @@ static inline int vnc_display_pw_expire(
 void curses_display_init(DisplayState *ds, int full_screen);
 
 /* input.c */
-int index_from_key(const char *key);
+int index_from_key(const char *key, size_t key_length);
 
 /* gtk.c */
 void early_gtk_display_init(void);
Index: xen-4.6.0-testing/tools/qemu-xen-dir-remote/ui/input-legacy.c
===================================================================
--- xen-4.6.0-testing.orig/tools/qemu-xen-dir-remote/ui/input-legacy.c
+++ xen-4.6.0-testing/tools/qemu-xen-dir-remote/ui/input-legacy.c
@@ -60,12 +60,13 @@ static QTAILQ_HEAD(, QEMUPutLEDEntry) le
 static QTAILQ_HEAD(, QEMUPutMouseEntry) mouse_handlers =
     QTAILQ_HEAD_INITIALIZER(mouse_handlers);
 
-int index_from_key(const char *key)
+int index_from_key(const char *key, size_t key_length)
 {
     int i;
 
     for (i = 0; QKeyCode_lookup[i] != NULL; i++) {
-        if (!strcmp(key, QKeyCode_lookup[i])) {
+        if (!strncmp(key, QKeyCode_lookup[i], key_length) &&
+            !QKeyCode_lookup[i][key_length]) {
             break;
         }
     }