1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
| | #include <stddef.h>
#include <elf.h>
#include <poll.h>
#include <fcntl.h>
#include "syscall.h"
#include "libc.h"
#include "atomic.h"
static void dummy(void *ent)
{
}
weak_alias(dummy, __init_ssp);
void __init_security(size_t *aux)
{
struct pollfd pfd[3] = { {.fd=0}, {.fd=1}, {.fd=2} };
int i;
#ifndef SHARED
__init_ssp((void *)aux[AT_RANDOM]);
#endif
if (aux[AT_UID]==aux[AT_EUID] && aux[AT_GID]==aux[AT_EGID]
&& !aux[AT_SECURE]) return;
__syscall(SYS_poll, pfd, 3, 0);
for (i=0; i<3; i++) if (pfd[i].revents&POLLNVAL)
if (__syscall(SYS_open, "/dev/null", O_RDWR|O_LARGEFILE)<0)
a_crash();
libc.secure = 1;
}
|