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hmp: fix sendkey out of bounds write (CVE-2015-8619) 

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>
This commit is contained in:
Wolfgang Bumiller 2016-01-13 09:09:58 +01:00 committed by Markus Armbruster
parent c65db7705b
commit 64ffbe04ea
3 changed files with 12 additions and 13 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

18
hmp.c
View File

@ -1731,21 +1731,18 @@ void hmp_sendkey(Monitor *mon, const QDict *qdict)
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));
@ -1758,16 +1755,17 @@ void hmp_sendkey(Monitor *mon, const QDict *qdict)
}
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->type = KEY_VALUE_KIND_NUMBER;
keylist->value->u.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;
}
@ -1789,7 +1787,7 @@ 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;
}

2
include/ui/console.h
View File

@ -448,7 +448,7 @@ static inline int vnc_display_pw_expire(const char *id, time_t expires)
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(int opengl);

5
ui/input-legacy.c
View File

@ -57,12 +57,13 @@ struct QEMUPutLEDEntry {
static QTAILQ_HEAD(, QEMUPutLEDEntry) led_handlers =
QTAILQ_HEAD_INITIALIZER(led_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;
}
}