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
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
|
/*
* unlink*() pre-check.
*
* Copyright 1999-2009 Gentoo Foundation
* Licensed under the GPL-2
*/
bool sb_unlinkat_pre_check(const char *func, const char *pathname, int dirfd)
{
char canonic[SB_PATH_MAX];
char dirfd_path[SB_PATH_MAX];
save_errno();
/* Expand the dirfd path first */
switch (resolve_dirfd_path(dirfd, pathname, dirfd_path, sizeof(dirfd_path))) {
case -1:
sb_debug_dyn("EARLY FAIL: %s(%s) @ resolve_dirfd_path: %s\n",
func, pathname, strerror(errno));
return false;
case 0:
pathname = dirfd_path;
break;
}
/* Then break down any relative/symlink paths */
if (-1 == canonicalize(pathname, canonic))
/* see comments in check_syscall() */
if (ENAMETOOLONG != errno) {
sb_debug_dyn("EARLY FAIL: %s(%s) @ canonicalize: %s\n",
func, pathname, strerror(errno));
return false;
}
/* XXX: Hack to make sure sandboxed process cannot remove
* a device node, bug #79836. */
if (0 == strcmp(canonic, "/dev/null") ||
0 == strcmp(canonic, "/dev/zero"))
{
errno = EACCES;
sb_debug_dyn("EARLY FAIL: %s(%s): %s\n",
func, pathname, strerror(errno));
return false;
}
restore_errno();
return true;
}
|
GitWeb
