120 lines
4.1 KiB
Diff
120 lines
4.1 KiB
Diff
From: Wolfgang Bumiller <w.bumiller@proxmox.com>
|
|
Date: Wed, 13 Jan 2016 09:09:58 +0100
|
|
Subject: [PATCH] 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>
|
|
|
|
(cherry picked from commit 64ffbe04eaafebf4045a3ace52a360c14959d196)
|
|
---
|
|
hmp.c | 18 ++++++++----------
|
|
include/ui/console.h | 2 +-
|
|
ui/input-legacy.c | 5 +++--
|
|
3 files changed, 12 insertions(+), 13 deletions(-)
|
|
|
|
diff --git a/hmp.c b/hmp.c
|
|
index 2140605..1904203 100644
|
|
--- a/hmp.c
|
|
+++ b/hmp.c
|
|
@@ -1734,21 +1734,18 @@ 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));
|
|
@@ -1761,16 +1758,17 @@ 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;
|
|
}
|
|
@@ -1792,7 +1790,7 @@ 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;
|
|
}
|
|
|
|
diff --git a/include/ui/console.h b/include/ui/console.h
|
|
index c249db4..5739bdd 100644
|
|
--- a/include/ui/console.h
|
|
+++ b/include/ui/console.h
|
|
@@ -433,7 +433,7 @@ 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);
|
|
diff --git a/ui/input-legacy.c b/ui/input-legacy.c
|
|
index e0a39f0..3f28bbc 100644
|
|
--- a/ui/input-legacy.c
|
|
+++ b/ui/input-legacy.c
|
|
@@ -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;
|
|
}
|
|
}
|