4 #include "pthread_impl.h"
13 static int checker(void *p)
17 if (__syscall(SYS_setgid, __syscall(SYS_getegid))
18 || __syscall(SYS_setuid, __syscall(SYS_geteuid)))
19 __syscall(SYS_exit, 1);
20 ret = __syscall(SYS_faccessat, c->fd, c->filename, c->amode, 0);
21 __syscall(SYS_write, c->p, &ret, sizeof ret);
22 __syscall(SYS_exit, 0);
25 int faccessat(int fd, const char *filename, int amode, int flag)
27 if (!flag || (flag==AT_EACCESS && getuid()==geteuid() && getgid()==getegid()))
28 return syscall(SYS_faccessat, fd, filename, amode, flag);
30 if (flag != AT_EACCESS)
31 return __syscall_ret(-EINVAL);
37 if (pipe(p)) return __syscall_ret(-EBUSY);
38 struct ctx c = { .fd = fd, .filename = filename, .amode = amode, .p = p[1] };
40 __block_app_sigs(&set);
42 ret = __clone(checker, stack+sizeof stack, 0, &c);
43 __syscall(SYS_close, p[1]);
45 if (ret<0 || __syscall(SYS_read, p[0], &ret, sizeof ret) != sizeof(ret))
47 __syscall(SYS_close, p[0]);
51 return __syscall_ret(ret);