forked from enlightenment/enlightenment
e: remove potential buffer overflow and make it more efficient.
Patch started by Maxime Villard (rustyBSD). SVN revision: 75812
This commit is contained in:
parent
1fb57fe691
commit
4de7c065af
|
@ -183,32 +183,45 @@ _e_exec_cb_exec(void *data, Efreet_Desktop *desktop, char *exec, int remaining)
|
|||
{
|
||||
const char *p1, *p2;
|
||||
char buf2[32];
|
||||
char *buf3 = NULL;
|
||||
int head;
|
||||
int head_length;
|
||||
int penv_display_length;
|
||||
|
||||
head = launch->zone->container->manager->num;
|
||||
|
||||
penv_display_length = strlen(penv_display);
|
||||
/* Check for insane length for DISPLAY env */
|
||||
if (penv_display_length + 32 > 4096) return NULL;
|
||||
|
||||
/* buf2 = '.%i' */
|
||||
*buf2 = '.';
|
||||
head_length = eina_convert_itoa(head, buf2 + 1) + 2;
|
||||
|
||||
/* set env vars */
|
||||
p1 = strrchr(penv_display, ':');
|
||||
p2 = strrchr(penv_display, '.');
|
||||
if ((p1) && (p2) && (p2 > p1)) /* "blah:x.y" */
|
||||
{
|
||||
/* yes it could overflow... but who will overflow DISPLAY eh? why? to
|
||||
* "exploit" your own applications running as you?
|
||||
*/
|
||||
strcpy(buf, penv_display);
|
||||
buf[p2 - penv_display + 1] = 0;
|
||||
snprintf(buf2, sizeof(buf2), "%i", head);
|
||||
strcat(buf, buf2);
|
||||
buf3 = alloca((p2 - penv_display) + head_length + 1);
|
||||
|
||||
memcpy(buf3, penv_display, p2 - penv_display);
|
||||
memcpy(buf3 + (p2 - penv_display), buf2, head_length);
|
||||
}
|
||||
else if (p1) /* "blah:x */
|
||||
{
|
||||
strcpy(buf, penv_display);
|
||||
snprintf(buf2, sizeof(buf2), ".%i", head);
|
||||
strcat(buf, buf2);
|
||||
buf3 = alloca(penv_display_length + head_length);
|
||||
|
||||
memcpy(buf3, penv_display, penv_display_length);
|
||||
memcpy(buf3 + penv_display_length, buf2, head_length);
|
||||
}
|
||||
else
|
||||
strcpy(buf, penv_display);
|
||||
e_util_env_set("DISPLAY", buf);
|
||||
{
|
||||
buf3 = alloca(penv_display_length + 1);
|
||||
memcpy(buf3, penv_display, penv_display_length + 1);
|
||||
}
|
||||
|
||||
e_util_env_set("DISPLAY", buf3);
|
||||
}
|
||||
snprintf(buf, sizeof(buf), "E_START|%i", startup_id);
|
||||
e_util_env_set("DESKTOP_STARTUP_ID", buf);
|
||||
|
|
Loading…
Reference in New Issue