blob: bf4d8d2288534399ba7e86636f6d59d96e2058f9 [file] [log] [blame]
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <assert.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/syscall.h>
int
main(void)
{
#if (defined __NR_getuid || defined __NR_getxuid) \
&& defined(__NR_setuid) \
&& defined(__NR_getresuid) \
&& defined(__NR_setreuid) \
&& defined(__NR_setresuid) \
&& defined(__NR_fchown) \
&& defined(__NR_getgroups)
int uid;
int size;
int *list = 0;
#ifndef __NR_getuid
# define __NR_getuid __NR_getxuid
#endif
uid = syscall(__NR_getuid);
(void) close(0);
if (open("/proc/sys/kernel/overflowuid", O_RDONLY) == 0) {
/* we trust the kernel */
char buf[sizeof(int)*3];
int n = read(0, buf, sizeof(buf) - 1);
if (n) {
buf[n] = '\0';
n = atoi(buf);
if (uid == n)
return 77;
}
(void) close(0);
}
assert(syscall(__NR_setuid, uid) == 0);
{
/*
* uids returned by getresuid should be ignored
* to avoid 16bit vs 32bit issues.
*/
int r, e, s;
assert(syscall(__NR_getresuid, &r, &e, &s) == 0);
}
assert(syscall(__NR_setreuid, -1, -1L) == 0);
assert(syscall(__NR_setresuid, uid, -1, -1L) == 0);
assert(syscall(__NR_fchown, 1, -1, -1L) == 0);
assert((size = syscall(__NR_getgroups, 0, list)) >= 0);
assert(list = calloc(size + 1, sizeof(*list)));
assert(syscall(__NR_getgroups, size, list) == size);
return 0;
#else
return 77;
#endif
}