1 |
kumaneko |
111 |
/* |
2 |
|
|
* fs/realpath.c |
3 |
|
|
* |
4 |
|
|
* Get the canonicalized absolute pathnames. The basis for SAKURA and TOMOYO. |
5 |
|
|
* |
6 |
kumaneko |
2030 |
* Copyright (C) 2005-2009 NTT DATA CORPORATION |
7 |
kumaneko |
111 |
* |
8 |
kumaneko |
2704 |
* Version: 1.7.0-pre 2009/05/28 |
9 |
kumaneko |
111 |
* |
10 |
|
|
* This file is applicable to both 2.4.30 and 2.6.11 and later. |
11 |
|
|
* See README.ccs for ChangeLog. |
12 |
|
|
* |
13 |
|
|
*/ |
14 |
|
|
#include <linux/string.h> |
15 |
|
|
#include <linux/mm.h> |
16 |
|
|
#include <linux/utime.h> |
17 |
|
|
#include <linux/file.h> |
18 |
|
|
#include <linux/smp_lock.h> |
19 |
|
|
#include <linux/module.h> |
20 |
|
|
#include <linux/slab.h> |
21 |
|
|
#include <asm/uaccess.h> |
22 |
|
|
#include <asm/atomic.h> |
23 |
|
|
#include <linux/version.h> |
24 |
kumaneko |
1052 |
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 5, 0) |
25 |
kumaneko |
111 |
#include <linux/namei.h> |
26 |
|
|
#include <linux/mount.h> |
27 |
kumaneko |
2002 |
static const int ccs_lookup_flags = LOOKUP_FOLLOW; |
28 |
kumaneko |
111 |
#else |
29 |
kumaneko |
2002 |
static const int ccs_lookup_flags = LOOKUP_FOLLOW | LOOKUP_POSITIVE; |
30 |
kumaneko |
111 |
#endif |
31 |
|
|
#include <linux/proc_fs.h> |
32 |
|
|
#include <linux/ccs_common.h> |
33 |
kumaneko |
2540 |
#include <linux/realpath.h> |
34 |
kumaneko |
2271 |
#include <net/sock.h> |
35 |
kumaneko |
111 |
|
36 |
kumaneko |
1052 |
/** |
37 |
kumaneko |
2002 |
* ccs_get_absolute_path - Get the path of a dentry but ignores chroot'ed root. |
38 |
kumaneko |
111 |
* |
39 |
kumaneko |
1052 |
* @dentry: Pointer to "struct dentry". |
40 |
|
|
* @vfsmnt: Pointer to "struct vfsmount". |
41 |
|
|
* @buffer: Pointer to buffer to return value in. |
42 |
|
|
* @buflen: Sizeof @buffer. |
43 |
|
|
* |
44 |
|
|
* Returns 0 on success, -ENOMEM otherwise. |
45 |
|
|
* |
46 |
kumaneko |
1064 |
* Caller holds the dcache_lock and vfsmount_lock. |
47 |
kumaneko |
111 |
* Based on __d_path() in fs/dcache.c |
48 |
|
|
* |
49 |
|
|
* If dentry is a directory, trailing '/' is appended. |
50 |
kumaneko |
1052 |
* Characters out of 0x20 < c < 0x7F range are converted to |
51 |
|
|
* \ooo style octal string. |
52 |
kumaneko |
111 |
* Character \ is converted to \\ string. |
53 |
|
|
*/ |
54 |
kumaneko |
2002 |
static int ccs_get_absolute_path(struct dentry *dentry, struct vfsmount *vfsmnt, |
55 |
|
|
char *buffer, int buflen) |
56 |
kumaneko |
111 |
{ |
57 |
kumaneko |
1052 |
/***** CRITICAL SECTION START *****/ |
58 |
kumaneko |
111 |
char *start = buffer; |
59 |
|
|
char *end = buffer + buflen; |
60 |
kumaneko |
621 |
bool is_dir = (dentry->d_inode && S_ISDIR(dentry->d_inode->i_mode)); |
61 |
kumaneko |
111 |
|
62 |
kumaneko |
1052 |
if (buflen < 256) |
63 |
|
|
goto out; |
64 |
kumaneko |
111 |
|
65 |
|
|
*--end = '\0'; |
66 |
|
|
buflen--; |
67 |
|
|
|
68 |
|
|
for (;;) { |
69 |
|
|
struct dentry *parent; |
70 |
|
|
|
71 |
|
|
if (dentry == vfsmnt->mnt_root || IS_ROOT(dentry)) { |
72 |
|
|
/* Global root? */ |
73 |
kumaneko |
1052 |
if (vfsmnt->mnt_parent == vfsmnt) |
74 |
kumaneko |
111 |
break; |
75 |
|
|
dentry = vfsmnt->mnt_mountpoint; |
76 |
|
|
vfsmnt = vfsmnt->mnt_parent; |
77 |
|
|
continue; |
78 |
|
|
} |
79 |
|
|
if (is_dir) { |
80 |
kumaneko |
1052 |
is_dir = false; |
81 |
|
|
*--end = '/'; |
82 |
|
|
buflen--; |
83 |
kumaneko |
111 |
} |
84 |
|
|
parent = dentry->d_parent; |
85 |
|
|
{ |
86 |
|
|
const char *sp = dentry->d_name.name; |
87 |
|
|
const char *cp = sp + dentry->d_name.len - 1; |
88 |
|
|
unsigned char c; |
89 |
|
|
|
90 |
kumaneko |
1052 |
/* |
91 |
|
|
* Exception: Use /proc/self/ rather than |
92 |
|
|
* /proc/\$/ for current process. |
93 |
|
|
*/ |
94 |
|
|
if (IS_ROOT(parent) && *sp > '0' && *sp <= '9' && |
95 |
|
|
parent->d_sb && |
96 |
|
|
parent->d_sb->s_magic == PROC_SUPER_MAGIC) { |
97 |
kumaneko |
111 |
char *ep; |
98 |
kumaneko |
1052 |
const pid_t pid |
99 |
|
|
= (pid_t) simple_strtoul(sp, &ep, 10); |
100 |
kumaneko |
1778 |
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 25) |
101 |
|
|
const pid_t tgid |
102 |
|
|
= task_tgid_nr_ns(current, |
103 |
|
|
dentry->d_sb-> |
104 |
|
|
s_fs_info); |
105 |
|
|
if (!*ep && pid == tgid && tgid) { |
106 |
kumaneko |
1052 |
sp = "self"; |
107 |
|
|
cp = sp + 3; |
108 |
|
|
} |
109 |
kumaneko |
111 |
#else |
110 |
kumaneko |
1778 |
if (!*ep && pid == sys_getpid()) { |
111 |
kumaneko |
1052 |
sp = "self"; |
112 |
|
|
cp = sp + 3; |
113 |
|
|
} |
114 |
kumaneko |
111 |
#endif |
115 |
|
|
} |
116 |
|
|
|
117 |
|
|
while (sp <= cp) { |
118 |
kumaneko |
1052 |
c = *(unsigned char *) cp; |
119 |
kumaneko |
111 |
if (c == '\\') { |
120 |
|
|
buflen -= 2; |
121 |
kumaneko |
1052 |
if (buflen < 0) |
122 |
|
|
goto out; |
123 |
kumaneko |
111 |
*--end = '\\'; |
124 |
|
|
*--end = '\\'; |
125 |
|
|
} else if (c > ' ' && c < 127) { |
126 |
kumaneko |
1052 |
if (--buflen < 0) |
127 |
|
|
goto out; |
128 |
kumaneko |
111 |
*--end = (char) c; |
129 |
|
|
} else { |
130 |
|
|
buflen -= 4; |
131 |
kumaneko |
1052 |
if (buflen < 0) |
132 |
|
|
goto out; |
133 |
kumaneko |
111 |
*--end = (c & 7) + '0'; |
134 |
|
|
*--end = ((c >> 3) & 7) + '0'; |
135 |
|
|
*--end = (c >> 6) + '0'; |
136 |
|
|
*--end = '\\'; |
137 |
|
|
} |
138 |
|
|
cp--; |
139 |
|
|
} |
140 |
kumaneko |
1052 |
if (--buflen < 0) |
141 |
|
|
goto out; |
142 |
kumaneko |
111 |
*--end = '/'; |
143 |
|
|
} |
144 |
|
|
dentry = parent; |
145 |
|
|
} |
146 |
kumaneko |
1052 |
if (*end == '/') { |
147 |
|
|
buflen++; |
148 |
|
|
end++; |
149 |
|
|
} |
150 |
kumaneko |
111 |
{ |
151 |
|
|
const char *sp = dentry->d_name.name; |
152 |
|
|
const char *cp = sp + dentry->d_name.len - 1; |
153 |
|
|
unsigned char c; |
154 |
|
|
while (sp <= cp) { |
155 |
kumaneko |
1052 |
c = *(unsigned char *) cp; |
156 |
kumaneko |
111 |
if (c == '\\') { |
157 |
|
|
buflen -= 2; |
158 |
kumaneko |
1052 |
if (buflen < 0) |
159 |
|
|
goto out; |
160 |
kumaneko |
111 |
*--end = '\\'; |
161 |
|
|
*--end = '\\'; |
162 |
|
|
} else if (c > ' ' && c < 127) { |
163 |
kumaneko |
1052 |
if (--buflen < 0) |
164 |
|
|
goto out; |
165 |
kumaneko |
111 |
*--end = (char) c; |
166 |
|
|
} else { |
167 |
|
|
buflen -= 4; |
168 |
kumaneko |
1052 |
if (buflen < 0) |
169 |
|
|
goto out; |
170 |
kumaneko |
111 |
*--end = (c & 7) + '0'; |
171 |
|
|
*--end = ((c >> 3) & 7) + '0'; |
172 |
|
|
*--end = (c >> 6) + '0'; |
173 |
|
|
*--end = '\\'; |
174 |
|
|
} |
175 |
|
|
cp--; |
176 |
|
|
} |
177 |
|
|
} |
178 |
|
|
/* Move the pathname to the top of the buffer. */ |
179 |
|
|
memmove(start, end, strlen(end) + 1); |
180 |
|
|
return 0; |
181 |
|
|
out: |
182 |
|
|
return -ENOMEM; |
183 |
kumaneko |
1052 |
/***** CRITICAL SECTION END *****/ |
184 |
kumaneko |
111 |
} |
185 |
|
|
|
186 |
kumaneko |
2271 |
#define SOCKFS_MAGIC 0x534F434B |
187 |
|
|
|
188 |
kumaneko |
1052 |
/** |
189 |
kumaneko |
1054 |
* ccs_realpath_from_dentry2 - Returns realpath(3) of the given dentry but ignores chroot'ed root. |
190 |
kumaneko |
1052 |
* |
191 |
|
|
* @dentry: Pointer to "struct dentry". |
192 |
|
|
* @mnt: Pointer to "struct vfsmount". |
193 |
|
|
* @newname: Pointer to buffer to return value in. |
194 |
kumaneko |
1064 |
* @newname_len: Size of @newname. |
195 |
kumaneko |
1052 |
* |
196 |
|
|
* Returns 0 on success, negative value otherwise. |
197 |
|
|
*/ |
198 |
|
|
int ccs_realpath_from_dentry2(struct dentry *dentry, struct vfsmount *mnt, |
199 |
|
|
char *newname, int newname_len) |
200 |
kumaneko |
111 |
{ |
201 |
kumaneko |
1379 |
int error = -EINVAL; |
202 |
kumaneko |
111 |
struct dentry *d_dentry; |
203 |
|
|
struct vfsmount *d_mnt; |
204 |
kumaneko |
1379 |
if (!dentry || !newname || newname_len <= 2048) |
205 |
|
|
goto out; |
206 |
kumaneko |
2271 |
/* Get better name for socket. */ |
207 |
|
|
if (dentry->d_sb && dentry->d_sb->s_magic == SOCKFS_MAGIC) { |
208 |
|
|
struct inode *inode = dentry->d_inode; |
209 |
kumaneko |
2284 |
struct socket *sock = inode ? SOCKET_I(inode) : NULL; |
210 |
|
|
struct sock *sk = sock ? sock->sk : NULL; |
211 |
|
|
if (sk) { |
212 |
kumaneko |
2271 |
snprintf(newname, newname_len - 1, |
213 |
kumaneko |
2284 |
"socket:[family=%u:type=%u:protocol=%u]", |
214 |
|
|
sk->sk_family, sk->sk_type, sk->sk_protocol); |
215 |
kumaneko |
2271 |
} else { |
216 |
|
|
snprintf(newname, newname_len - 1, "socket:[unknown]"); |
217 |
|
|
} |
218 |
|
|
return 0; |
219 |
|
|
} |
220 |
kumaneko |
1259 |
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 22) |
221 |
|
|
if (dentry->d_op && dentry->d_op->d_dname) { |
222 |
|
|
/* For "socket:[\$]" and "pipe:[\$]". */ |
223 |
|
|
static const int offset = 1536; |
224 |
|
|
char *dp = newname; |
225 |
|
|
char *sp = dentry->d_op->d_dname(dentry, newname + offset, |
226 |
|
|
newname_len - offset); |
227 |
|
|
if (IS_ERR(sp)) { |
228 |
|
|
error = PTR_ERR(sp); |
229 |
|
|
goto out; |
230 |
|
|
} |
231 |
|
|
error = -ENOMEM; |
232 |
|
|
newname += offset; |
233 |
|
|
while (1) { |
234 |
|
|
const unsigned char c = *(unsigned char *) sp++; |
235 |
|
|
if (c == '\\') { |
236 |
|
|
if (dp + 2 >= newname) |
237 |
|
|
break; |
238 |
|
|
*dp++ = '\\'; |
239 |
|
|
*dp++ = '\\'; |
240 |
|
|
} else if (c > ' ' && c < 127) { |
241 |
|
|
if (dp + 1 >= newname) |
242 |
|
|
break; |
243 |
|
|
*dp++ = (char) c; |
244 |
|
|
} else if (c) { |
245 |
|
|
if (dp + 4 >= newname) |
246 |
|
|
break; |
247 |
|
|
*dp++ = '\\'; |
248 |
|
|
*dp++ = (c >> 6) + '0'; |
249 |
|
|
*dp++ = ((c >> 3) & 7) + '0'; |
250 |
|
|
*dp++ = (c & 7) + '0'; |
251 |
|
|
} else { |
252 |
|
|
*dp = '\0'; |
253 |
|
|
return 0; |
254 |
|
|
} |
255 |
|
|
} |
256 |
|
|
goto out; |
257 |
|
|
} |
258 |
|
|
#endif |
259 |
kumaneko |
1379 |
if (!mnt) |
260 |
|
|
goto out; |
261 |
kumaneko |
111 |
d_dentry = dget(dentry); |
262 |
|
|
d_mnt = mntget(mnt); |
263 |
|
|
/***** CRITICAL SECTION START *****/ |
264 |
kumaneko |
1474 |
ccs_realpath_lock(); |
265 |
kumaneko |
2002 |
error = ccs_get_absolute_path(d_dentry, d_mnt, newname, newname_len); |
266 |
kumaneko |
1474 |
ccs_realpath_unlock(); |
267 |
kumaneko |
111 |
/***** CRITICAL SECTION END *****/ |
268 |
|
|
dput(d_dentry); |
269 |
|
|
mntput(d_mnt); |
270 |
kumaneko |
1259 |
out: |
271 |
kumaneko |
1056 |
if (error) |
272 |
kumaneko |
1379 |
printk(KERN_WARNING "ccs_realpath: Pathname too long. (%d)\n", |
273 |
|
|
error); |
274 |
kumaneko |
111 |
return error; |
275 |
|
|
} |
276 |
|
|
|
277 |
kumaneko |
1052 |
/** |
278 |
kumaneko |
1054 |
* ccs_realpath_from_dentry - Returns realpath(3) of the given pathname but ignores chroot'ed root. |
279 |
kumaneko |
1052 |
* |
280 |
|
|
* @dentry: Pointer to "struct dentry". |
281 |
|
|
* @mnt: Pointer to "struct vfsmount". |
282 |
|
|
* |
283 |
|
|
* Returns the realpath of the given @dentry and @mnt on success, |
284 |
|
|
* NULL otherwise. |
285 |
|
|
* |
286 |
|
|
* These functions use ccs_alloc(), so caller must ccs_free() |
287 |
|
|
* if these functions didn't return NULL. |
288 |
|
|
*/ |
289 |
|
|
char *ccs_realpath_from_dentry(struct dentry *dentry, struct vfsmount *mnt) |
290 |
kumaneko |
111 |
{ |
291 |
kumaneko |
2037 |
char *buf = ccs_alloc(CCS_MAX_PATHNAME_LEN, false); |
292 |
kumaneko |
1052 |
if (buf && ccs_realpath_from_dentry2(dentry, mnt, buf, |
293 |
|
|
CCS_MAX_PATHNAME_LEN - 1) == 0) |
294 |
|
|
return buf; |
295 |
kumaneko |
111 |
ccs_free(buf); |
296 |
|
|
return NULL; |
297 |
|
|
} |
298 |
|
|
|
299 |
kumaneko |
1052 |
/** |
300 |
|
|
* ccs_realpath - Get realpath of a pathname. |
301 |
|
|
* |
302 |
|
|
* @pathname: The pathname to solve. |
303 |
|
|
* |
304 |
|
|
* Returns the realpath of @pathname on success, NULL otherwise. |
305 |
|
|
*/ |
306 |
|
|
char *ccs_realpath(const char *pathname) |
307 |
kumaneko |
111 |
{ |
308 |
|
|
struct nameidata nd; |
309 |
kumaneko |
2002 |
if (pathname && path_lookup(pathname, ccs_lookup_flags, &nd) == 0) { |
310 |
kumaneko |
1052 |
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 25) |
311 |
|
|
char *buf = ccs_realpath_from_dentry(nd.path.dentry, |
312 |
|
|
nd.path.mnt); |
313 |
kumaneko |
990 |
path_put(&nd.path); |
314 |
|
|
#else |
315 |
kumaneko |
1052 |
char *buf = ccs_realpath_from_dentry(nd.dentry, nd.mnt); |
316 |
kumaneko |
111 |
path_release(&nd); |
317 |
kumaneko |
990 |
#endif |
318 |
kumaneko |
111 |
return buf; |
319 |
|
|
} |
320 |
|
|
return NULL; |
321 |
|
|
} |
322 |
|
|
|
323 |
kumaneko |
1052 |
/** |
324 |
kumaneko |
2037 |
* ccs_realpath_both - Get realpath of a pathname and symlink. |
325 |
kumaneko |
1052 |
* |
326 |
|
|
* @pathname: The pathname to solve. |
327 |
kumaneko |
2037 |
* @ee: Pointer to "struct ccs_execve_entry". |
328 |
kumaneko |
1052 |
* |
329 |
kumaneko |
2075 |
* Returns 0 on success, negative value otherwise. |
330 |
kumaneko |
1052 |
*/ |
331 |
kumaneko |
2075 |
int ccs_realpath_both(const char *pathname, struct ccs_execve_entry *ee) |
332 |
kumaneko |
111 |
{ |
333 |
|
|
struct nameidata nd; |
334 |
kumaneko |
2037 |
int ret; |
335 |
|
|
bool is_symlink; |
336 |
|
|
if (!pathname || |
337 |
|
|
path_lookup(pathname, ccs_lookup_flags ^ LOOKUP_FOLLOW, &nd)) |
338 |
kumaneko |
2075 |
return -ENOENT; |
339 |
kumaneko |
1052 |
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 25) |
340 |
kumaneko |
2037 |
is_symlink = nd.path.dentry->d_inode && |
341 |
|
|
S_ISLNK(nd.path.dentry->d_inode->i_mode); |
342 |
|
|
ret = ccs_realpath_from_dentry2(nd.path.dentry, nd.path.mnt, |
343 |
|
|
ee->tmp, CCS_EXEC_TMPSIZE - 1); |
344 |
|
|
path_put(&nd.path); |
345 |
kumaneko |
990 |
#else |
346 |
kumaneko |
2037 |
is_symlink = nd.dentry->d_inode && S_ISLNK(nd.dentry->d_inode->i_mode); |
347 |
|
|
ret = ccs_realpath_from_dentry2(nd.dentry, nd.mnt, ee->tmp, |
348 |
|
|
CCS_EXEC_TMPSIZE - 1); |
349 |
|
|
path_release(&nd); |
350 |
kumaneko |
990 |
#endif |
351 |
kumaneko |
2037 |
if (ret) |
352 |
kumaneko |
2075 |
return -ENOMEM; |
353 |
kumaneko |
2044 |
if (strlen(ee->tmp) > CCS_MAX_PATHNAME_LEN - 1) |
354 |
kumaneko |
2075 |
return -ENOMEM; |
355 |
kumaneko |
2037 |
ee->program_path[CCS_MAX_PATHNAME_LEN - 1] = '\0'; |
356 |
|
|
if (!is_symlink) { |
357 |
|
|
strncpy(ee->program_path, ee->tmp, |
358 |
|
|
CCS_MAX_PATHNAME_LEN - 1); |
359 |
kumaneko |
2075 |
return 0; |
360 |
kumaneko |
111 |
} |
361 |
kumaneko |
2037 |
if (path_lookup(pathname, ccs_lookup_flags, &nd)) |
362 |
kumaneko |
2075 |
return -ENOENT; |
363 |
kumaneko |
2037 |
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 25) |
364 |
|
|
ret = ccs_realpath_from_dentry2(nd.path.dentry, nd.path.mnt, |
365 |
|
|
ee->program_path, |
366 |
|
|
CCS_MAX_PATHNAME_LEN - 1); |
367 |
|
|
path_put(&nd.path); |
368 |
|
|
#else |
369 |
|
|
ret = ccs_realpath_from_dentry2(nd.dentry, nd.mnt, ee->program_path, |
370 |
|
|
CCS_MAX_PATHNAME_LEN - 1); |
371 |
|
|
path_release(&nd); |
372 |
|
|
#endif |
373 |
kumaneko |
2075 |
return ret ? -ENOMEM : 0; |
374 |
kumaneko |
111 |
} |
375 |
|
|
|
376 |
kumaneko |
1052 |
/** |
377 |
kumaneko |
2519 |
* ccs_encode: Encode binary string to ascii string. |
378 |
|
|
* |
379 |
|
|
* @str: String in binary format. |
380 |
|
|
* |
381 |
|
|
* Returns pointer to @str in ascii format on success, NULL otherwise. |
382 |
|
|
* |
383 |
|
|
* This function uses ccs_alloc(), so caller must ccs_free() if this function |
384 |
|
|
* didn't return NULL. |
385 |
|
|
*/ |
386 |
|
|
char *ccs_encode(const char *str) |
387 |
|
|
{ |
388 |
|
|
int len = 0; |
389 |
|
|
const char *p = str; |
390 |
|
|
char *cp; |
391 |
|
|
char *cp0; |
392 |
|
|
if (!p) |
393 |
|
|
return NULL; |
394 |
|
|
while (*p) { |
395 |
|
|
const unsigned char c = *p++; |
396 |
|
|
if (c == '\\') |
397 |
|
|
len += 2; |
398 |
|
|
else if (c > ' ' && c < 127) |
399 |
|
|
len++; |
400 |
|
|
else |
401 |
|
|
len += 4; |
402 |
|
|
} |
403 |
|
|
len++; |
404 |
|
|
cp = ccs_alloc(len, false); |
405 |
|
|
if (!cp) |
406 |
|
|
return NULL; |
407 |
|
|
cp0 = cp; |
408 |
|
|
p = str; |
409 |
|
|
while (*p) { |
410 |
|
|
const unsigned char c = *p++; |
411 |
|
|
if (c == '\\') { |
412 |
|
|
*cp++ = '\\'; |
413 |
|
|
*cp++ = '\\'; |
414 |
|
|
} else if (c > ' ' && c < 127) { |
415 |
|
|
*cp++ = c; |
416 |
|
|
} else { |
417 |
|
|
*cp++ = '\\'; |
418 |
|
|
*cp++ = (c >> 6) + '0'; |
419 |
|
|
*cp++ = ((c >> 3) & 7) + '0'; |
420 |
|
|
*cp++ = (c & 7) + '0'; |
421 |
|
|
} |
422 |
|
|
} |
423 |
|
|
return cp0; |
424 |
|
|
} |
425 |
|
|
|
426 |
|
|
/** |
427 |
kumaneko |
2002 |
* ccs_round_up - Round up an integer so that the returned pointers are appropriately aligned. |
428 |
kumaneko |
1052 |
* |
429 |
|
|
* @size: Size in bytes. |
430 |
|
|
* |
431 |
|
|
* Returns rounded value of @size. |
432 |
|
|
* |
433 |
|
|
* FIXME: Are there more requirements that is needed for assigning value |
434 |
|
|
* atomically? |
435 |
kumaneko |
111 |
*/ |
436 |
kumaneko |
2002 |
static inline unsigned int ccs_round_up(const unsigned int size) |
437 |
kumaneko |
1052 |
{ |
438 |
|
|
if (sizeof(void *) >= sizeof(long)) |
439 |
|
|
return ((size + sizeof(void *) - 1) |
440 |
|
|
/ sizeof(void *)) * sizeof(void *); |
441 |
|
|
else |
442 |
|
|
return ((size + sizeof(long) - 1) |
443 |
|
|
/ sizeof(long)) * sizeof(long); |
444 |
kumaneko |
111 |
} |
445 |
|
|
|
446 |
kumaneko |
2701 |
static atomic_t ccs_allocated_memory_for_elements; |
447 |
kumaneko |
2002 |
static unsigned int ccs_quota_for_elements; |
448 |
kumaneko |
111 |
|
449 |
kumaneko |
1052 |
/** |
450 |
kumaneko |
2540 |
* ccs_memory_ok - Check memory quota. |
451 |
kumaneko |
1052 |
* |
452 |
kumaneko |
2540 |
* @ptr: Pointer to allocated memory. |
453 |
kumaneko |
1052 |
* |
454 |
kumaneko |
2540 |
* Returns true if @ptr is not NULL and quota not exceeded, false otehrwise. |
455 |
|
|
*/ |
456 |
|
|
bool ccs_memory_ok(const void *ptr) |
457 |
|
|
{ |
458 |
|
|
const unsigned int len = ptr ? ksize(ptr) : 0; |
459 |
|
|
if (len && (!ccs_quota_for_elements || |
460 |
kumaneko |
2701 |
atomic_read(&ccs_allocated_memory_for_elements) + len |
461 |
kumaneko |
2540 |
<= ccs_quota_for_elements)) { |
462 |
kumaneko |
2701 |
atomic_add(len, &ccs_allocated_memory_for_elements); |
463 |
kumaneko |
2540 |
return true; |
464 |
|
|
} |
465 |
|
|
printk(KERN_WARNING "ERROR: Out of memory. (%s)\n", __func__); |
466 |
|
|
if (!ccs_policy_loaded) |
467 |
|
|
panic("MAC Initialization failed.\n"); |
468 |
|
|
return false; |
469 |
|
|
} |
470 |
|
|
|
471 |
|
|
/** |
472 |
|
|
* ccs_memory_free - Free memory for elements. |
473 |
kumaneko |
1052 |
* |
474 |
kumaneko |
2540 |
* @ptr: Pointer to allocated memory. |
475 |
kumaneko |
1052 |
*/ |
476 |
kumaneko |
2540 |
static void ccs_memory_free(const void *ptr) |
477 |
kumaneko |
111 |
{ |
478 |
kumaneko |
2701 |
atomic_sub(ksize(ptr), &ccs_allocated_memory_for_elements); |
479 |
kumaneko |
2540 |
kfree(ptr); |
480 |
|
|
} |
481 |
|
|
|
482 |
|
|
/** |
483 |
|
|
* ccs_free_element - Delete memory for structures. |
484 |
|
|
* |
485 |
|
|
* @ptr: Memory to release. |
486 |
|
|
*/ |
487 |
|
|
static void ccs_free_element(void *ptr) |
488 |
|
|
{ |
489 |
|
|
if (!ptr) |
490 |
|
|
return; |
491 |
kumaneko |
2701 |
atomic_sub(ksize(ptr), &ccs_allocated_memory_for_elements); |
492 |
kumaneko |
2540 |
kfree(ptr); |
493 |
|
|
} |
494 |
|
|
|
495 |
|
|
/** |
496 |
|
|
* ccs_put_path_group - Delete memory for "struct ccs_path_group_entry". |
497 |
|
|
* |
498 |
|
|
* @group: Pointer to "struct ccs_path_group_entry". |
499 |
|
|
*/ |
500 |
|
|
void ccs_put_path_group(struct ccs_path_group_entry *group) |
501 |
|
|
{ |
502 |
|
|
struct ccs_path_group_member *member; |
503 |
|
|
struct ccs_path_group_member *next_member; |
504 |
|
|
LIST_HEAD(q); |
505 |
|
|
bool can_delete_group = false; |
506 |
kumaneko |
2545 |
if (!group) |
507 |
|
|
return; |
508 |
kumaneko |
2690 |
mutex_lock(&ccs_policy_lock); |
509 |
kumaneko |
2540 |
if (atomic_dec_and_test(&group->users)) { |
510 |
|
|
list_for_each_entry_safe(member, next_member, |
511 |
|
|
&group->path_group_member_list, |
512 |
|
|
list) { |
513 |
|
|
if (!member->is_deleted) |
514 |
|
|
break; |
515 |
|
|
list_del(&member->list); |
516 |
|
|
list_add(&member->list, &q); |
517 |
kumaneko |
111 |
} |
518 |
kumaneko |
2540 |
if (list_empty(&group->path_group_member_list)) { |
519 |
|
|
list_del(&group->list); |
520 |
|
|
can_delete_group = true; |
521 |
kumaneko |
111 |
} |
522 |
|
|
} |
523 |
kumaneko |
2690 |
mutex_unlock(&ccs_policy_lock); |
524 |
kumaneko |
2540 |
list_for_each_entry_safe(member, next_member, &q, list) { |
525 |
|
|
list_del(&member->list); |
526 |
|
|
ccs_put_name(member->member_name); |
527 |
|
|
ccs_free_element(member); |
528 |
|
|
} |
529 |
|
|
if (can_delete_group) { |
530 |
|
|
ccs_put_name(group->group_name); |
531 |
|
|
ccs_free_element(group); |
532 |
|
|
} |
533 |
kumaneko |
111 |
} |
534 |
|
|
|
535 |
kumaneko |
2540 |
/** |
536 |
|
|
* ccs_put_address_group - Delete memory for "struct ccs_address_group_entry". |
537 |
|
|
* |
538 |
|
|
* @group: Pointer to "struct ccs_address_group_entry". |
539 |
|
|
*/ |
540 |
|
|
void ccs_put_address_group(struct ccs_address_group_entry *group) |
541 |
|
|
{ |
542 |
|
|
struct ccs_address_group_member *member; |
543 |
|
|
struct ccs_address_group_member *next_member; |
544 |
|
|
LIST_HEAD(q); |
545 |
|
|
bool can_delete_group = false; |
546 |
kumaneko |
2545 |
if (!group) |
547 |
|
|
return; |
548 |
kumaneko |
2690 |
mutex_lock(&ccs_policy_lock); |
549 |
kumaneko |
2540 |
if (atomic_dec_and_test(&group->users)) { |
550 |
|
|
list_for_each_entry_safe(member, next_member, |
551 |
|
|
&group->address_group_member_list, |
552 |
|
|
list) { |
553 |
|
|
if (!member->is_deleted) |
554 |
|
|
break; |
555 |
|
|
list_del(&member->list); |
556 |
|
|
list_add(&member->list, &q); |
557 |
|
|
} |
558 |
|
|
if (list_empty(&group->address_group_member_list)) { |
559 |
|
|
list_del(&group->list); |
560 |
|
|
can_delete_group = true; |
561 |
|
|
} |
562 |
|
|
} |
563 |
kumaneko |
2690 |
mutex_unlock(&ccs_policy_lock); |
564 |
kumaneko |
2540 |
list_for_each_entry_safe(member, next_member, &q, list) { |
565 |
|
|
list_del(&member->list); |
566 |
|
|
if (member->is_ipv6) { |
567 |
|
|
ccs_put_ipv6_address(member->min.ipv6); |
568 |
|
|
ccs_put_ipv6_address(member->max.ipv6); |
569 |
|
|
} |
570 |
|
|
ccs_free_element(member); |
571 |
|
|
} |
572 |
|
|
if (can_delete_group) { |
573 |
|
|
ccs_put_name(group->group_name); |
574 |
|
|
ccs_free_element(group); |
575 |
|
|
} |
576 |
|
|
} |
577 |
|
|
|
578 |
|
|
static LIST_HEAD(ccs_address_list); |
579 |
|
|
|
580 |
|
|
/** |
581 |
|
|
* ccs_get_ipv6_address - Keep the given IPv6 address on the RAM. |
582 |
|
|
* |
583 |
|
|
* @addr: Pointer to "struct in6_addr". |
584 |
|
|
* |
585 |
|
|
* Returns pointer to "struct in6_addr" on success, NULL otherwise. |
586 |
|
|
* |
587 |
|
|
* The RAM is shared, so NEVER try to modify or kfree() the returned address. |
588 |
|
|
*/ |
589 |
|
|
const struct in6_addr *ccs_get_ipv6_address(const struct in6_addr *addr) |
590 |
|
|
{ |
591 |
kumaneko |
2575 |
struct ccs_ipv6addr_entry *entry; |
592 |
|
|
struct ccs_ipv6addr_entry *ptr; |
593 |
kumaneko |
2540 |
int error = -ENOMEM; |
594 |
|
|
if (!addr) |
595 |
|
|
return NULL; |
596 |
|
|
entry = kzalloc(sizeof(*entry), GFP_KERNEL); |
597 |
kumaneko |
2690 |
mutex_lock(&ccs_policy_lock); |
598 |
kumaneko |
2540 |
list_for_each_entry(ptr, &ccs_address_list, list) { |
599 |
|
|
if (memcmp(&ptr->addr, addr, sizeof(*addr))) |
600 |
|
|
continue; |
601 |
|
|
atomic_inc(&ptr->users); |
602 |
|
|
error = 0; |
603 |
|
|
break; |
604 |
|
|
} |
605 |
|
|
if (error && ccs_memory_ok(entry)) { |
606 |
|
|
ptr = entry; |
607 |
|
|
ptr->addr = *addr; |
608 |
|
|
atomic_set(&ptr->users, 1); |
609 |
|
|
list_add_tail(&ptr->list, &ccs_address_list); |
610 |
|
|
entry = NULL; |
611 |
|
|
} |
612 |
kumaneko |
2690 |
mutex_unlock(&ccs_policy_lock); |
613 |
kumaneko |
2540 |
kfree(entry); |
614 |
|
|
return ptr ? &ptr->addr : NULL; |
615 |
|
|
} |
616 |
|
|
|
617 |
|
|
/** |
618 |
|
|
* ccs_put_ipv6_address - Delete the given IPv6 address on the RAM. |
619 |
|
|
* |
620 |
|
|
* @addr: Pointer to "struct in6_addr". |
621 |
|
|
*/ |
622 |
|
|
void ccs_put_ipv6_address(const struct in6_addr *addr) |
623 |
|
|
{ |
624 |
kumaneko |
2575 |
struct ccs_ipv6addr_entry *ptr; |
625 |
kumaneko |
2540 |
bool can_delete = false; |
626 |
|
|
if (!addr) |
627 |
|
|
return; |
628 |
kumaneko |
2575 |
ptr = container_of(addr, struct ccs_ipv6addr_entry, addr); |
629 |
kumaneko |
2690 |
mutex_lock(&ccs_policy_lock); |
630 |
kumaneko |
2540 |
if (atomic_dec_and_test(&ptr->users)) { |
631 |
|
|
list_del(&ptr->list); |
632 |
|
|
can_delete = true; |
633 |
|
|
} |
634 |
kumaneko |
2690 |
mutex_unlock(&ccs_policy_lock); |
635 |
kumaneko |
2546 |
if (can_delete) |
636 |
|
|
ccs_free_element(ptr); |
637 |
kumaneko |
2540 |
} |
638 |
|
|
|
639 |
kumaneko |
2553 |
/** |
640 |
kumaneko |
2576 |
* ccs_put_condition - Delete memory for "struct ccs_condition". |
641 |
kumaneko |
2553 |
* |
642 |
kumaneko |
2576 |
* @cond: Pointer to "struct ccs_condition". |
643 |
kumaneko |
2553 |
*/ |
644 |
kumaneko |
2576 |
void ccs_put_condition(struct ccs_condition *cond) |
645 |
kumaneko |
2553 |
{ |
646 |
|
|
const unsigned long *ptr; |
647 |
|
|
const struct ccs_argv_entry *argv; |
648 |
|
|
const struct ccs_envp_entry *envp; |
649 |
|
|
const struct ccs_symlinkp_entry *symlinkp; |
650 |
|
|
u16 condc; |
651 |
|
|
u16 argc; |
652 |
|
|
u16 envc; |
653 |
|
|
u16 symlinkc; |
654 |
|
|
u16 i; |
655 |
|
|
bool can_delete = false; |
656 |
|
|
if (!cond) |
657 |
|
|
return; |
658 |
kumaneko |
2690 |
mutex_lock(&ccs_policy_lock); |
659 |
kumaneko |
2553 |
if (atomic_dec_and_test(&cond->users)) { |
660 |
|
|
list_del(&cond->list); |
661 |
|
|
can_delete = true; |
662 |
|
|
} |
663 |
kumaneko |
2690 |
mutex_unlock(&ccs_policy_lock); |
664 |
kumaneko |
2553 |
if (!can_delete) |
665 |
|
|
return; |
666 |
kumaneko |
2698 |
condc = cond->condc; |
667 |
|
|
argc = cond->argc; |
668 |
|
|
envc = cond->envc; |
669 |
|
|
symlinkc = cond->symlinkc; |
670 |
kumaneko |
2553 |
ptr = (const unsigned long *) (cond + 1); |
671 |
|
|
argv = (const struct ccs_argv_entry *) (ptr + condc); |
672 |
|
|
envp = (const struct ccs_envp_entry *) (argv + argc); |
673 |
|
|
symlinkp = (const struct ccs_symlinkp_entry *) (envp + envc); |
674 |
|
|
for (i = 0; i < argc; argv++, i++) |
675 |
|
|
ccs_put_name(argv->value); |
676 |
|
|
for (i = 0; i < envc; envp++, i++) { |
677 |
|
|
ccs_put_name(envp->name); |
678 |
|
|
ccs_put_name(envp->value); |
679 |
|
|
} |
680 |
|
|
for (i = 0; i < symlinkc; symlinkp++, i++) |
681 |
|
|
ccs_put_name(symlinkp->value); |
682 |
|
|
ccs_free_element(cond); |
683 |
|
|
} |
684 |
|
|
|
685 |
kumaneko |
2701 |
static atomic_t ccs_allocated_memory_for_savename; |
686 |
kumaneko |
2002 |
static unsigned int ccs_quota_for_savename; |
687 |
kumaneko |
111 |
|
688 |
|
|
#define MAX_HASH 256 |
689 |
|
|
|
690 |
kumaneko |
1052 |
/* Structure for string data. */ |
691 |
kumaneko |
2002 |
struct ccs_name_entry { |
692 |
kumaneko |
2540 |
struct list_head list; |
693 |
|
|
atomic_t users; |
694 |
kumaneko |
2002 |
struct ccs_path_info entry; |
695 |
kumaneko |
214 |
}; |
696 |
kumaneko |
111 |
|
697 |
kumaneko |
2002 |
/* The list for "struct ccs_name_entry". */ |
698 |
kumaneko |
2540 |
static struct list_head ccs_name_list[MAX_HASH]; |
699 |
|
|
static DEFINE_MUTEX(ccs_name_list_lock); |
700 |
kumaneko |
731 |
|
701 |
kumaneko |
1052 |
/** |
702 |
kumaneko |
2540 |
* ccs_get_name - Allocate memory for string data. |
703 |
kumaneko |
1052 |
* |
704 |
|
|
* @name: The string to store into the permernent memory. |
705 |
|
|
* |
706 |
kumaneko |
2002 |
* Returns pointer to "struct ccs_path_info" on success, NULL otherwise. |
707 |
kumaneko |
1052 |
*/ |
708 |
kumaneko |
2540 |
const struct ccs_path_info *ccs_get_name(const char *name) |
709 |
kumaneko |
111 |
{ |
710 |
kumaneko |
2002 |
struct ccs_name_entry *ptr; |
711 |
kumaneko |
111 |
unsigned int hash; |
712 |
|
|
int len; |
713 |
kumaneko |
2540 |
int allocated_len; |
714 |
|
|
|
715 |
kumaneko |
1052 |
if (!name) |
716 |
|
|
return NULL; |
717 |
kumaneko |
111 |
len = strlen(name) + 1; |
718 |
|
|
if (len > CCS_MAX_PATHNAME_LEN) { |
719 |
kumaneko |
2551 |
printk(KERN_WARNING "ERROR: Name too long. (%s)\n", __func__); |
720 |
kumaneko |
111 |
return NULL; |
721 |
|
|
} |
722 |
|
|
hash = full_name_hash((const unsigned char *) name, len - 1); |
723 |
kumaneko |
2540 |
/***** EXCLUSIVE SECTION START *****/ |
724 |
|
|
mutex_lock(&ccs_name_list_lock); |
725 |
|
|
list_for_each_entry(ptr, &ccs_name_list[hash % MAX_HASH], list) { |
726 |
|
|
if (hash != ptr->entry.hash || strcmp(name, ptr->entry.name)) |
727 |
|
|
continue; |
728 |
|
|
atomic_inc(&ptr->users); |
729 |
|
|
goto out; |
730 |
kumaneko |
111 |
} |
731 |
kumaneko |
2540 |
ptr = kmalloc(sizeof(*ptr) + len, GFP_KERNEL); |
732 |
|
|
allocated_len = ptr ? ksize(ptr) : 0; |
733 |
|
|
if (!allocated_len || |
734 |
|
|
(ccs_quota_for_savename && |
735 |
kumaneko |
2701 |
atomic_read(&ccs_allocated_memory_for_savename) + allocated_len |
736 |
kumaneko |
2540 |
> ccs_quota_for_savename)) { |
737 |
|
|
kfree(ptr); |
738 |
|
|
ptr = NULL; |
739 |
kumaneko |
2551 |
printk(KERN_WARNING "ERROR: Out of memory. (%s)\n", __func__); |
740 |
kumaneko |
2040 |
if (!ccs_policy_loaded) |
741 |
kumaneko |
1052 |
panic("MAC Initialization failed.\n"); |
742 |
kumaneko |
731 |
goto out; |
743 |
|
|
} |
744 |
kumaneko |
2701 |
atomic_add(allocated_len, &ccs_allocated_memory_for_savename); |
745 |
kumaneko |
2540 |
ptr->entry.name = ((char *) ptr) + sizeof(*ptr); |
746 |
|
|
memmove((char *) ptr->entry.name, name, len); |
747 |
|
|
atomic_set(&ptr->users, 1); |
748 |
kumaneko |
1052 |
ccs_fill_path_info(&ptr->entry); |
749 |
kumaneko |
2540 |
list_add_tail(&ptr->list, &ccs_name_list[hash % MAX_HASH]); |
750 |
kumaneko |
111 |
out: |
751 |
kumaneko |
2540 |
mutex_unlock(&ccs_name_list_lock); |
752 |
|
|
/***** EXCLUSIVE SECTION END *****/ |
753 |
kumaneko |
111 |
return ptr ? &ptr->entry : NULL; |
754 |
|
|
} |
755 |
|
|
|
756 |
kumaneko |
2540 |
/** |
757 |
|
|
* ccs_put_name - Delete shared memory for string data. |
758 |
|
|
* |
759 |
|
|
* @name: Pointer to "struct ccs_path_info". |
760 |
|
|
*/ |
761 |
|
|
void ccs_put_name(const struct ccs_path_info *name) |
762 |
|
|
{ |
763 |
|
|
struct ccs_name_entry *ptr; |
764 |
|
|
bool can_delete = false; |
765 |
|
|
if (!name) |
766 |
|
|
return; |
767 |
|
|
ptr = container_of(name, struct ccs_name_entry, entry); |
768 |
|
|
/***** EXCLUSIVE SECTION START *****/ |
769 |
|
|
mutex_lock(&ccs_name_list_lock); |
770 |
|
|
if (atomic_dec_and_test(&ptr->users)) { |
771 |
|
|
list_del(&ptr->list); |
772 |
|
|
can_delete = true; |
773 |
|
|
} |
774 |
|
|
mutex_unlock(&ccs_name_list_lock); |
775 |
|
|
/***** EXCLUSIVE SECTION END *****/ |
776 |
|
|
if (can_delete) { |
777 |
kumaneko |
2701 |
atomic_sub(ksize(ptr), &ccs_allocated_memory_for_savename); |
778 |
kumaneko |
2540 |
kfree(ptr); |
779 |
|
|
} |
780 |
|
|
} |
781 |
|
|
|
782 |
kumaneko |
1052 |
/* Structure for temporarily allocated memory. */ |
783 |
kumaneko |
2002 |
struct ccs_cache_entry { |
784 |
kumaneko |
111 |
struct list_head list; |
785 |
|
|
void *ptr; |
786 |
|
|
int size; |
787 |
kumaneko |
214 |
}; |
788 |
kumaneko |
111 |
|
789 |
kumaneko |
1052 |
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 20) |
790 |
|
|
static struct kmem_cache *ccs_cachep; |
791 |
kumaneko |
111 |
#else |
792 |
kumaneko |
1052 |
static kmem_cache_t *ccs_cachep; |
793 |
kumaneko |
111 |
#endif |
794 |
|
|
|
795 |
kumaneko |
2702 |
struct srcu_struct ccs_ss; |
796 |
|
|
|
797 |
kumaneko |
1052 |
/** |
798 |
|
|
* ccs_realpath_init - Initialize realpath related code. |
799 |
|
|
* |
800 |
|
|
* Returns 0. |
801 |
|
|
*/ |
802 |
|
|
static int __init ccs_realpath_init(void) |
803 |
kumaneko |
111 |
{ |
804 |
kumaneko |
731 |
int i; |
805 |
kumaneko |
2540 |
/* Constraint for ccs_get_name(). */ |
806 |
kumaneko |
1052 |
if (CCS_MAX_PATHNAME_LEN > PAGE_SIZE) |
807 |
|
|
panic("Bad size."); |
808 |
kumaneko |
2037 |
/* Constraint for "struct ccs_execve_entry"->tmp users. */ |
809 |
|
|
if (CCS_MAX_PATHNAME_LEN > CCS_EXEC_TMPSIZE) |
810 |
|
|
panic("Bad size."); |
811 |
kumaneko |
2702 |
if (init_srcu_struct(&ccs_ss)) |
812 |
|
|
panic("Out of memory."); |
813 |
kumaneko |
1052 |
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 23) |
814 |
kumaneko |
2002 |
ccs_cachep = kmem_cache_create("ccs_cache", |
815 |
|
|
sizeof(struct ccs_cache_entry), |
816 |
kumaneko |
1052 |
0, 0, NULL); |
817 |
kumaneko |
316 |
#else |
818 |
kumaneko |
2002 |
ccs_cachep = kmem_cache_create("ccs_cache", |
819 |
|
|
sizeof(struct ccs_cache_entry), |
820 |
kumaneko |
1052 |
0, 0, NULL, NULL); |
821 |
kumaneko |
316 |
#endif |
822 |
kumaneko |
1052 |
if (!ccs_cachep) |
823 |
|
|
panic("Can't create cache.\n"); |
824 |
|
|
for (i = 0; i < MAX_HASH; i++) |
825 |
kumaneko |
2540 |
INIT_LIST_HEAD(&ccs_name_list[i]); |
826 |
|
|
INIT_LIST_HEAD(&ccs_kernel_domain.acl_info_list); |
827 |
|
|
ccs_kernel_domain.domainname = ccs_get_name(ROOT_NAME); |
828 |
kumaneko |
2692 |
list_add_tail_rcu(&ccs_kernel_domain.list, &ccs_domain_list); |
829 |
|
|
if (ccs_find_domain(ROOT_NAME) != &ccs_kernel_domain) |
830 |
kumaneko |
2282 |
panic("Can't register ccs_kernel_domain"); |
831 |
kumaneko |
2703 |
#ifdef CONFIG_CCSECURITY_BUILTIN_INITIALIZERS |
832 |
kumaneko |
2308 |
{ |
833 |
|
|
/* Load built-in policy. */ |
834 |
kumaneko |
2392 |
static char ccs_builtin_initializers[] __initdata |
835 |
kumaneko |
2703 |
= CONFIG_CCSECURITY_BUILTIN_INITIALIZERS; |
836 |
kumaneko |
2392 |
char *cp = ccs_builtin_initializers; |
837 |
|
|
ccs_normalize_line(cp); |
838 |
|
|
while (cp && *cp) { |
839 |
|
|
char *cp2 = strchr(cp, ' '); |
840 |
|
|
if (cp2) |
841 |
|
|
*cp2++ = '\0'; |
842 |
|
|
ccs_write_domain_initializer_policy(cp, false, false); |
843 |
|
|
cp = cp2; |
844 |
kumaneko |
2308 |
} |
845 |
|
|
} |
846 |
|
|
#endif |
847 |
kumaneko |
1052 |
return 0; |
848 |
kumaneko |
111 |
} |
849 |
|
|
|
850 |
kumaneko |
1084 |
#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 5, 0) |
851 |
kumaneko |
1052 |
__initcall(ccs_realpath_init); |
852 |
kumaneko |
1084 |
#else |
853 |
kumaneko |
1106 |
core_initcall(ccs_realpath_init); |
854 |
kumaneko |
1084 |
#endif |
855 |
kumaneko |
1052 |
|
856 |
kumaneko |
2002 |
/* The list for "struct ccs_cache_entry". */ |
857 |
|
|
static LIST_HEAD(ccs_audit_cache_list); |
858 |
|
|
static LIST_HEAD(ccs_acl_cache_list); |
859 |
|
|
static DEFINE_SPINLOCK(ccs_cache_list_lock); |
860 |
kumaneko |
1052 |
|
861 |
kumaneko |
2002 |
static unsigned int ccs_dynamic_memory_size; |
862 |
|
|
static unsigned int ccs_quota_for_dynamic; |
863 |
kumaneko |
1052 |
|
864 |
|
|
#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 5, 0) |
865 |
|
|
/** |
866 |
kumaneko |
2002 |
* ccs_round2 - Rounded up to power-of-two value. |
867 |
kumaneko |
1052 |
* |
868 |
|
|
* @size: Size in bytes. |
869 |
|
|
* |
870 |
|
|
* Returns power-of-two of @size. |
871 |
|
|
*/ |
872 |
kumaneko |
2002 |
static int ccs_round2(size_t size) |
873 |
kumaneko |
581 |
{ |
874 |
|
|
#if PAGE_SIZE == 4096 |
875 |
|
|
size_t bsize = 32; |
876 |
|
|
#else |
877 |
|
|
size_t bsize = 64; |
878 |
|
|
#endif |
879 |
kumaneko |
1064 |
while (size > bsize) |
880 |
|
|
bsize <<= 1; |
881 |
kumaneko |
581 |
return bsize; |
882 |
|
|
} |
883 |
|
|
#endif |
884 |
|
|
|
885 |
kumaneko |
1052 |
/** |
886 |
kumaneko |
1793 |
* ccs_alloc - Allocate memory for temporary purpose. |
887 |
kumaneko |
1052 |
* |
888 |
|
|
* @size: Size in bytes. |
889 |
|
|
* |
890 |
|
|
* Returns pointer to allocated memory on success, NULL otherwise. |
891 |
|
|
*/ |
892 |
kumaneko |
1907 |
void *ccs_alloc(const size_t size, const _Bool check_quota) |
893 |
kumaneko |
111 |
{ |
894 |
kumaneko |
2002 |
struct ccs_cache_entry *new_entry; |
895 |
kumaneko |
1055 |
void *ret = kzalloc(size, GFP_KERNEL); |
896 |
kumaneko |
1052 |
if (!ret) |
897 |
|
|
goto out; |
898 |
kumaneko |
1031 |
new_entry = kmem_cache_alloc(ccs_cachep, GFP_KERNEL); |
899 |
|
|
if (!new_entry) { |
900 |
kumaneko |
1064 |
kfree(ret); |
901 |
|
|
ret = NULL; |
902 |
kumaneko |
1031 |
goto out; |
903 |
|
|
} |
904 |
|
|
INIT_LIST_HEAD(&new_entry->list); |
905 |
|
|
new_entry->ptr = ret; |
906 |
kumaneko |
1052 |
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 5, 0) |
907 |
kumaneko |
1031 |
new_entry->size = ksize(ret); |
908 |
|
|
#else |
909 |
kumaneko |
2002 |
new_entry->size = ccs_round2(size); |
910 |
kumaneko |
1031 |
#endif |
911 |
kumaneko |
1903 |
if (check_quota) { |
912 |
|
|
bool quota_exceeded = false; |
913 |
|
|
/***** CRITICAL SECTION START *****/ |
914 |
kumaneko |
2002 |
spin_lock(&ccs_cache_list_lock); |
915 |
|
|
if (!ccs_quota_for_dynamic || |
916 |
|
|
ccs_dynamic_memory_size + new_entry->size |
917 |
|
|
<= ccs_quota_for_dynamic) { |
918 |
|
|
list_add_tail(&new_entry->list, &ccs_audit_cache_list); |
919 |
|
|
ccs_dynamic_memory_size += new_entry->size; |
920 |
kumaneko |
1903 |
} else { |
921 |
|
|
quota_exceeded = true; |
922 |
|
|
} |
923 |
kumaneko |
2002 |
spin_unlock(&ccs_cache_list_lock); |
924 |
kumaneko |
1903 |
/***** CRITICAL SECTION END *****/ |
925 |
|
|
if (quota_exceeded) { |
926 |
|
|
kfree(ret); |
927 |
|
|
kmem_cache_free(ccs_cachep, new_entry); |
928 |
|
|
ret = NULL; |
929 |
|
|
} |
930 |
|
|
} else { |
931 |
|
|
/***** CRITICAL SECTION START *****/ |
932 |
kumaneko |
2002 |
spin_lock(&ccs_cache_list_lock); |
933 |
|
|
list_add(&new_entry->list, &ccs_acl_cache_list); |
934 |
|
|
ccs_dynamic_memory_size += new_entry->size; |
935 |
|
|
spin_unlock(&ccs_cache_list_lock); |
936 |
kumaneko |
1903 |
/***** CRITICAL SECTION END *****/ |
937 |
|
|
} |
938 |
kumaneko |
1031 |
out: |
939 |
kumaneko |
214 |
return ret; |
940 |
kumaneko |
111 |
} |
941 |
|
|
|
942 |
kumaneko |
1052 |
/** |
943 |
|
|
* ccs_free - Release memory allocated by ccs_alloc(). |
944 |
|
|
* |
945 |
|
|
* @p: Pointer returned by ccs_alloc(). May be NULL. |
946 |
|
|
* |
947 |
|
|
* Returns nothing. |
948 |
|
|
*/ |
949 |
kumaneko |
111 |
void ccs_free(const void *p) |
950 |
|
|
{ |
951 |
|
|
struct list_head *v; |
952 |
kumaneko |
2002 |
struct ccs_cache_entry *entry = NULL; |
953 |
kumaneko |
1052 |
if (!p) |
954 |
|
|
return; |
955 |
|
|
/***** CRITICAL SECTION START *****/ |
956 |
kumaneko |
2002 |
spin_lock(&ccs_cache_list_lock); |
957 |
|
|
list_for_each(v, &ccs_acl_cache_list) { |
958 |
|
|
entry = list_entry(v, struct ccs_cache_entry, list); |
959 |
kumaneko |
1903 |
if (entry->ptr == p) |
960 |
|
|
break; |
961 |
|
|
entry = NULL; |
962 |
|
|
} |
963 |
|
|
if (!entry) { |
964 |
kumaneko |
2002 |
list_for_each(v, &ccs_audit_cache_list) { |
965 |
|
|
entry = list_entry(v, struct ccs_cache_entry, list); |
966 |
kumaneko |
1903 |
if (entry->ptr == p) |
967 |
|
|
break; |
968 |
kumaneko |
1064 |
entry = NULL; |
969 |
kumaneko |
111 |
} |
970 |
kumaneko |
1903 |
} |
971 |
|
|
if (entry) { |
972 |
kumaneko |
111 |
list_del(&entry->list); |
973 |
kumaneko |
2002 |
ccs_dynamic_memory_size -= entry->size; |
974 |
kumaneko |
111 |
} |
975 |
kumaneko |
2002 |
spin_unlock(&ccs_cache_list_lock); |
976 |
kumaneko |
1052 |
/***** CRITICAL SECTION END *****/ |
977 |
kumaneko |
111 |
if (entry) { |
978 |
|
|
kfree(p); |
979 |
|
|
kmem_cache_free(ccs_cachep, entry); |
980 |
|
|
} else { |
981 |
kumaneko |
1052 |
printk(KERN_WARNING "BUG: ccs_free() with invalid pointer.\n"); |
982 |
kumaneko |
111 |
} |
983 |
|
|
} |
984 |
kumaneko |
1180 |
|
985 |
|
|
/** |
986 |
|
|
* ccs_read_memory_counter - Check for memory usage. |
987 |
|
|
* |
988 |
|
|
* @head: Pointer to "struct ccs_io_buffer". |
989 |
|
|
* |
990 |
|
|
* Returns memory usage. |
991 |
|
|
*/ |
992 |
|
|
int ccs_read_memory_counter(struct ccs_io_buffer *head) |
993 |
|
|
{ |
994 |
|
|
if (!head->read_eof) { |
995 |
kumaneko |
2701 |
const unsigned int shared |
996 |
|
|
= atomic_read(&ccs_allocated_memory_for_savename); |
997 |
|
|
const unsigned int private |
998 |
|
|
= atomic_read(&ccs_allocated_memory_for_elements); |
999 |
kumaneko |
2002 |
const unsigned int dynamic = ccs_dynamic_memory_size; |
1000 |
kumaneko |
1180 |
char buffer[64]; |
1001 |
|
|
memset(buffer, 0, sizeof(buffer)); |
1002 |
kumaneko |
2002 |
if (ccs_quota_for_savename) |
1003 |
kumaneko |
1180 |
snprintf(buffer, sizeof(buffer) - 1, |
1004 |
kumaneko |
2002 |
" (Quota: %10u)", ccs_quota_for_savename); |
1005 |
kumaneko |
1180 |
else |
1006 |
|
|
buffer[0] = '\0'; |
1007 |
|
|
ccs_io_printf(head, "Shared: %10u%s\n", shared, buffer); |
1008 |
kumaneko |
2002 |
if (ccs_quota_for_elements) |
1009 |
kumaneko |
1180 |
snprintf(buffer, sizeof(buffer) - 1, |
1010 |
kumaneko |
2002 |
" (Quota: %10u)", ccs_quota_for_elements); |
1011 |
kumaneko |
1180 |
else |
1012 |
|
|
buffer[0] = '\0'; |
1013 |
|
|
ccs_io_printf(head, "Private: %10u%s\n", private, buffer); |
1014 |
kumaneko |
2002 |
if (ccs_quota_for_dynamic) |
1015 |
kumaneko |
1903 |
snprintf(buffer, sizeof(buffer) - 1, |
1016 |
kumaneko |
2002 |
" (Quota: %10u)", ccs_quota_for_dynamic); |
1017 |
kumaneko |
1903 |
else |
1018 |
|
|
buffer[0] = '\0'; |
1019 |
|
|
ccs_io_printf(head, "Dynamic: %10u%s\n", dynamic, buffer); |
1020 |
kumaneko |
1180 |
ccs_io_printf(head, "Total: %10u\n", |
1021 |
|
|
shared + private + dynamic); |
1022 |
|
|
head->read_eof = true; |
1023 |
|
|
} |
1024 |
|
|
return 0; |
1025 |
|
|
} |
1026 |
|
|
|
1027 |
|
|
/** |
1028 |
|
|
* ccs_write_memory_quota - Set memory quota. |
1029 |
|
|
* |
1030 |
|
|
* @head: Pointer to "struct ccs_io_buffer". |
1031 |
|
|
* |
1032 |
|
|
* Returns 0. |
1033 |
|
|
*/ |
1034 |
|
|
int ccs_write_memory_quota(struct ccs_io_buffer *head) |
1035 |
|
|
{ |
1036 |
|
|
char *data = head->write_buf; |
1037 |
|
|
unsigned int size; |
1038 |
|
|
if (sscanf(data, "Shared: %u", &size) == 1) |
1039 |
kumaneko |
2002 |
ccs_quota_for_savename = size; |
1040 |
kumaneko |
1180 |
else if (sscanf(data, "Private: %u", &size) == 1) |
1041 |
kumaneko |
2002 |
ccs_quota_for_elements = size; |
1042 |
kumaneko |
1903 |
else if (sscanf(data, "Dynamic: %u", &size) == 1) |
1043 |
kumaneko |
2002 |
ccs_quota_for_dynamic = size; |
1044 |
kumaneko |
1180 |
return 0; |
1045 |
|
|
} |
1046 |
kumaneko |
2540 |
|
1047 |
kumaneko |
2701 |
/* Garbage collector functions */ |
1048 |
|
|
|
1049 |
|
|
enum ccs_gc_id { |
1050 |
|
|
CCS_ID_CONDITION, |
1051 |
|
|
CCS_ID_RESERVEDPORT, |
1052 |
|
|
CCS_ID_ADDRESS_GROUP, |
1053 |
|
|
CCS_ID_ADDRESS_GROUP_MEMBER, |
1054 |
|
|
CCS_ID_PATH_GROUP, |
1055 |
|
|
CCS_ID_PATH_GROUP_MEMBER, |
1056 |
|
|
CCS_ID_GLOBAL_ENV, |
1057 |
|
|
CCS_ID_AGGREGATOR, |
1058 |
|
|
CCS_ID_DOMAIN_INITIALIZER, |
1059 |
|
|
CCS_ID_DOMAIN_KEEPER, |
1060 |
|
|
CCS_ID_ALIAS, |
1061 |
|
|
CCS_ID_GLOBALLY_READABLE, |
1062 |
|
|
CCS_ID_PATTERN, |
1063 |
|
|
CCS_ID_NO_REWRITE, |
1064 |
|
|
CCS_ID_MANAGER, |
1065 |
|
|
CCS_ID_ACL, |
1066 |
|
|
CCS_ID_DOMAIN |
1067 |
|
|
}; |
1068 |
|
|
|
1069 |
|
|
struct ccs_gc_entry { |
1070 |
|
|
struct list_head list; |
1071 |
|
|
int type; |
1072 |
|
|
void *element; |
1073 |
|
|
}; |
1074 |
|
|
|
1075 |
|
|
/* Caller holds ccs_policy_lock mutex. */ |
1076 |
|
|
static bool ccs_add_to_gc(const int type, void *element, struct list_head *head) |
1077 |
kumaneko |
2540 |
{ |
1078 |
kumaneko |
2701 |
struct ccs_gc_entry *entry = kmalloc(sizeof(*entry), GFP_ATOMIC); |
1079 |
|
|
if (!entry) |
1080 |
|
|
return false; |
1081 |
|
|
entry->type = type; |
1082 |
|
|
entry->element = element; |
1083 |
|
|
list_add(&entry->list, head); |
1084 |
|
|
return true; |
1085 |
kumaneko |
2540 |
} |
1086 |
|
|
|
1087 |
kumaneko |
2701 |
static inline void ccs_gc_del_domain_initializer |
1088 |
|
|
(struct ccs_domain_initializer_entry *ptr) |
1089 |
kumaneko |
2540 |
{ |
1090 |
kumaneko |
2701 |
ccs_put_name(ptr->domainname); |
1091 |
|
|
ccs_put_name(ptr->program); |
1092 |
kumaneko |
2540 |
} |
1093 |
|
|
|
1094 |
kumaneko |
2701 |
static inline void ccs_gc_del_domain_keeper |
1095 |
|
|
(struct ccs_domain_keeper_entry *ptr) |
1096 |
kumaneko |
2540 |
{ |
1097 |
kumaneko |
2701 |
ccs_put_name(ptr->domainname); |
1098 |
|
|
ccs_put_name(ptr->program); |
1099 |
kumaneko |
2540 |
} |
1100 |
|
|
|
1101 |
kumaneko |
2701 |
static void ccs_del_allow_read(struct ccs_globally_readable_file_entry *ptr) |
1102 |
kumaneko |
2540 |
{ |
1103 |
kumaneko |
2701 |
ccs_put_name(ptr->filename); |
1104 |
|
|
ccs_memory_free(ptr); |
1105 |
kumaneko |
2540 |
} |
1106 |
|
|
|
1107 |
kumaneko |
2701 |
static void ccs_del_allow_env(struct ccs_globally_usable_env_entry *ptr) |
1108 |
kumaneko |
2540 |
{ |
1109 |
kumaneko |
2701 |
ccs_put_name(ptr->env); |
1110 |
|
|
ccs_memory_free(ptr); |
1111 |
kumaneko |
2540 |
} |
1112 |
|
|
|
1113 |
kumaneko |
2701 |
static void ccs_del_file_pattern(struct ccs_pattern_entry *ptr) |
1114 |
kumaneko |
2540 |
{ |
1115 |
kumaneko |
2701 |
ccs_put_name(ptr->pattern); |
1116 |
|
|
ccs_memory_free(ptr); |
1117 |
kumaneko |
2540 |
} |
1118 |
|
|
|
1119 |
kumaneko |
2701 |
static void ccs_del_no_rewrite(struct ccs_no_rewrite_entry *ptr) |
1120 |
kumaneko |
2540 |
{ |
1121 |
kumaneko |
2701 |
ccs_put_name(ptr->pattern); |
1122 |
|
|
ccs_memory_free(ptr); |
1123 |
kumaneko |
2540 |
} |
1124 |
|
|
|
1125 |
kumaneko |
2701 |
static void ccs_del_domain_initializer(struct ccs_domain_initializer_entry *ptr) |
1126 |
kumaneko |
2540 |
{ |
1127 |
kumaneko |
2701 |
ccs_put_name(ptr->domainname); |
1128 |
|
|
ccs_put_name(ptr->program); |
1129 |
|
|
ccs_memory_free(ptr); |
1130 |
kumaneko |
2540 |
} |
1131 |
|
|
|
1132 |
kumaneko |
2701 |
static void ccs_del_domain_keeper(struct ccs_domain_keeper_entry *ptr) |
1133 |
kumaneko |
2540 |
{ |
1134 |
kumaneko |
2701 |
ccs_put_name(ptr->domainname); |
1135 |
|
|
ccs_put_name(ptr->program); |
1136 |
|
|
ccs_memory_free(ptr); |
1137 |
kumaneko |
2540 |
} |
1138 |
|
|
|
1139 |
kumaneko |
2701 |
static void ccs_del_alias(struct ccs_alias_entry *ptr) |
1140 |
|
|
{ |
1141 |
|
|
ccs_put_name(ptr->original_name); |
1142 |
|
|
ccs_put_name(ptr->aliased_name); |
1143 |
|
|
ccs_memory_free(ptr); |
1144 |
|
|
} |
1145 |
|
|
|
1146 |
|
|
static void ccs_del_aggregator(struct ccs_aggregator_entry *ptr) |
1147 |
|
|
{ |
1148 |
|
|
ccs_put_name(ptr->original_name); |
1149 |
|
|
ccs_put_name(ptr->aggregated_name); |
1150 |
|
|
ccs_memory_free(ptr); |
1151 |
|
|
} |
1152 |
|
|
|
1153 |
|
|
static void ccs_del_manager(struct ccs_policy_manager_entry *ptr) |
1154 |
|
|
{ |
1155 |
|
|
ccs_put_name(ptr->manager); |
1156 |
|
|
ccs_memory_free(ptr); |
1157 |
|
|
} |
1158 |
|
|
|
1159 |
kumaneko |
2540 |
/* For compatibility with older kernels. */ |
1160 |
|
|
#ifndef for_each_process |
1161 |
|
|
#define for_each_process for_each_task |
1162 |
|
|
#endif |
1163 |
|
|
|
1164 |
|
|
/** |
1165 |
|
|
* ccs_used_by_task - Check whether the given pointer is referenced by a task. |
1166 |
|
|
* |
1167 |
|
|
* @domain: Pointer to "struct ccs_domain_info". |
1168 |
|
|
* |
1169 |
|
|
* Returns true if @ptr is in use, false otherwise. |
1170 |
|
|
*/ |
1171 |
|
|
static bool ccs_used_by_task(struct ccs_domain_info *domain) |
1172 |
|
|
{ |
1173 |
|
|
bool in_use = false; |
1174 |
|
|
struct task_struct *p; |
1175 |
|
|
/***** CRITICAL SECTION START *****/ |
1176 |
|
|
read_lock(&tasklist_lock); |
1177 |
|
|
for_each_process(p) { |
1178 |
|
|
if (p->ccs_domain_info != domain) |
1179 |
|
|
continue; |
1180 |
|
|
in_use = true; |
1181 |
|
|
break; |
1182 |
|
|
} |
1183 |
|
|
read_unlock(&tasklist_lock); |
1184 |
|
|
/***** CRITICAL SECTION END *****/ |
1185 |
|
|
return in_use; |
1186 |
|
|
} |
1187 |
|
|
|
1188 |
kumaneko |
2701 |
static void ccs_del_acl(struct ccs_acl_info *acl) |
1189 |
kumaneko |
2540 |
{ |
1190 |
kumaneko |
2701 |
struct ccs_single_path_acl_record *acl1; |
1191 |
|
|
struct ccs_double_path_acl_record *acl2; |
1192 |
|
|
struct ccs_ip_network_acl_record *acl3; |
1193 |
|
|
struct ccs_ioctl_acl_record *acl4; |
1194 |
|
|
struct ccs_argv0_acl_record *acl5; |
1195 |
|
|
struct ccs_env_acl_record *acl6; |
1196 |
|
|
struct ccs_capability_acl_record *acl7; |
1197 |
|
|
struct ccs_signal_acl_record *acl8; |
1198 |
|
|
struct ccs_execute_handler_record *acl9; |
1199 |
kumaneko |
2707 |
struct ccs_mount_acl_record *acl10; |
1200 |
|
|
struct ccs_umount_acl_record *acl11; |
1201 |
|
|
struct ccs_chroot_acl_record *acl12; |
1202 |
|
|
struct ccs_pivot_root_acl_record *acl13; |
1203 |
kumaneko |
2701 |
ccs_put_condition(acl->cond); |
1204 |
|
|
switch (ccs_acl_type1(acl)) { |
1205 |
|
|
case TYPE_SINGLE_PATH_ACL: |
1206 |
|
|
acl1 = container_of(acl, struct ccs_single_path_acl_record, |
1207 |
|
|
head); |
1208 |
|
|
if (acl1->u_is_group) |
1209 |
|
|
ccs_put_path_group(acl1->u.group); |
1210 |
|
|
else |
1211 |
|
|
ccs_put_name(acl1->u.filename); |
1212 |
|
|
break; |
1213 |
|
|
case TYPE_DOUBLE_PATH_ACL: |
1214 |
|
|
acl2 = container_of(acl, struct ccs_double_path_acl_record, |
1215 |
|
|
head); |
1216 |
|
|
if (acl2->u1_is_group) |
1217 |
|
|
ccs_put_path_group(acl2->u1.group1); |
1218 |
|
|
else |
1219 |
|
|
ccs_put_name(acl2->u1.filename1); |
1220 |
|
|
if (acl2->u2_is_group) |
1221 |
|
|
ccs_put_path_group(acl2->u2.group2); |
1222 |
|
|
else |
1223 |
|
|
ccs_put_name(acl2->u2.filename2); |
1224 |
|
|
break; |
1225 |
|
|
case TYPE_IP_NETWORK_ACL: |
1226 |
|
|
acl3 = container_of(acl, struct ccs_ip_network_acl_record, |
1227 |
|
|
head); |
1228 |
|
|
if (acl3->record_type == IP_RECORD_TYPE_ADDRESS_GROUP) |
1229 |
|
|
ccs_put_address_group(acl3->u.group); |
1230 |
|
|
else if (acl3->record_type == IP_RECORD_TYPE_IPv6) { |
1231 |
|
|
ccs_put_ipv6_address(acl3->u.ipv6.min); |
1232 |
|
|
ccs_put_ipv6_address(acl3->u.ipv6.max); |
1233 |
|
|
} |
1234 |
|
|
break; |
1235 |
|
|
case TYPE_IOCTL_ACL: |
1236 |
|
|
acl4 = container_of(acl, struct ccs_ioctl_acl_record, head); |
1237 |
|
|
if (acl4->u_is_group) |
1238 |
|
|
ccs_put_path_group(acl4->u.group); |
1239 |
|
|
else |
1240 |
|
|
ccs_put_name(acl4->u.filename); |
1241 |
|
|
break; |
1242 |
|
|
case TYPE_ARGV0_ACL: |
1243 |
|
|
acl5 = container_of(acl, struct ccs_argv0_acl_record, head); |
1244 |
|
|
ccs_put_name(acl5->argv0); |
1245 |
|
|
break; |
1246 |
|
|
case TYPE_ENV_ACL: |
1247 |
|
|
acl6 = container_of(acl, struct ccs_env_acl_record, head); |
1248 |
|
|
ccs_put_name(acl6->env); |
1249 |
|
|
break; |
1250 |
|
|
case TYPE_CAPABILITY_ACL: |
1251 |
|
|
acl7 = container_of(acl, struct ccs_capability_acl_record, |
1252 |
|
|
head); |
1253 |
|
|
break; |
1254 |
|
|
case TYPE_SIGNAL_ACL: |
1255 |
|
|
acl8 = container_of(acl, struct ccs_signal_acl_record, |
1256 |
|
|
head); |
1257 |
|
|
ccs_put_name(acl8->domainname); |
1258 |
|
|
break; |
1259 |
|
|
case TYPE_EXECUTE_HANDLER: |
1260 |
|
|
case TYPE_DENIED_EXECUTE_HANDLER: |
1261 |
|
|
acl9 = container_of(acl, struct ccs_execute_handler_record, |
1262 |
|
|
head); |
1263 |
|
|
ccs_put_name(acl9->handler); |
1264 |
|
|
break; |
1265 |
kumaneko |
2707 |
case TYPE_MOUNT_ACL: |
1266 |
|
|
acl10 = container_of(acl, struct ccs_mount_acl_record, head); |
1267 |
|
|
ccs_put_name(acl10->dev_name); |
1268 |
|
|
ccs_put_name(acl10->dir_name); |
1269 |
|
|
ccs_put_name(acl10->fs_type); |
1270 |
|
|
break; |
1271 |
|
|
case TYPE_UMOUNT_ACL: |
1272 |
|
|
acl11 = container_of(acl, struct ccs_umount_acl_record, head); |
1273 |
|
|
ccs_put_name(acl11->dir); |
1274 |
|
|
break; |
1275 |
|
|
case TYPE_CHROOT_ACL: |
1276 |
|
|
acl12 = container_of(acl, struct ccs_chroot_acl_record, head); |
1277 |
|
|
ccs_put_name(acl12->dir); |
1278 |
|
|
break; |
1279 |
|
|
case TYPE_PIVOT_ROOT_ACL: |
1280 |
|
|
acl13 = container_of(acl, struct ccs_pivot_root_acl_record, |
1281 |
|
|
head); |
1282 |
|
|
ccs_put_name(acl13->old_root); |
1283 |
|
|
ccs_put_name(acl13->new_root); |
1284 |
|
|
break; |
1285 |
|
|
|
1286 |
kumaneko |
2701 |
} |
1287 |
|
|
ccs_memory_free(acl); |
1288 |
|
|
} |
1289 |
|
|
|
1290 |
|
|
static bool ccs_del_domain(struct ccs_domain_info *domain) |
1291 |
|
|
{ |
1292 |
|
|
if (ccs_used_by_task(domain)) |
1293 |
|
|
return false; |
1294 |
|
|
ccs_put_name(domain->domainname); |
1295 |
|
|
ccs_memory_free(domain); |
1296 |
|
|
return true; |
1297 |
|
|
} |
1298 |
|
|
|
1299 |
|
|
static void ccs_del_path_group_member(struct ccs_path_group_member *member) |
1300 |
|
|
{ |
1301 |
|
|
ccs_put_name(member->member_name); |
1302 |
|
|
ccs_free_element(member); |
1303 |
|
|
} |
1304 |
|
|
|
1305 |
|
|
static void ccs_del_path_group(struct ccs_path_group_entry *group) |
1306 |
|
|
{ |
1307 |
|
|
ccs_put_name(group->group_name); |
1308 |
|
|
ccs_free_element(group); |
1309 |
|
|
} |
1310 |
|
|
|
1311 |
|
|
static void ccs_del_address_group_member |
1312 |
|
|
(struct ccs_address_group_member *member) |
1313 |
|
|
{ |
1314 |
|
|
if (member->is_ipv6) { |
1315 |
|
|
ccs_put_ipv6_address(member->min.ipv6); |
1316 |
|
|
ccs_put_ipv6_address(member->max.ipv6); |
1317 |
|
|
} |
1318 |
|
|
ccs_free_element(member); |
1319 |
|
|
} |
1320 |
|
|
|
1321 |
|
|
static void ccs_del_address_group(struct ccs_address_group_entry *group) |
1322 |
|
|
{ |
1323 |
|
|
ccs_put_name(group->group_name); |
1324 |
|
|
ccs_free_element(group); |
1325 |
|
|
} |
1326 |
|
|
|
1327 |
|
|
static void ccs_del_reservedport(struct ccs_reserved_entry *ptr) |
1328 |
|
|
{ |
1329 |
|
|
ccs_memory_free(ptr); |
1330 |
|
|
} |
1331 |
|
|
|
1332 |
|
|
static void ccs_del_condition(struct ccs_condition *ptr) |
1333 |
|
|
{ |
1334 |
|
|
int i; |
1335 |
|
|
u16 condc = ptr->condc; |
1336 |
|
|
u16 argc = ptr->argc; |
1337 |
|
|
u16 envc = ptr->envc; |
1338 |
|
|
u16 symlinkc = ptr->symlinkc; |
1339 |
|
|
unsigned long *ptr2 = (unsigned long *) (ptr + 1); |
1340 |
|
|
struct ccs_argv_entry *argv = (struct ccs_argv_entry *) (ptr2 + condc); |
1341 |
|
|
struct ccs_envp_entry *envp = (struct ccs_envp_entry *) (argv + argc); |
1342 |
|
|
struct ccs_symlinkp_entry *symlinkp |
1343 |
|
|
= (struct ccs_symlinkp_entry *) (envp + envc); |
1344 |
|
|
for (i = 0; i < argc; i++) |
1345 |
|
|
ccs_put_name(argv[i].value); |
1346 |
|
|
for (i = 0; i < envc; i++) { |
1347 |
|
|
ccs_put_name(envp[i].name); |
1348 |
|
|
ccs_put_name(envp[i].value); |
1349 |
|
|
} |
1350 |
|
|
for (i = 0; i < symlinkc; i++) |
1351 |
|
|
ccs_put_name(symlinkp[i].value); |
1352 |
|
|
ccs_memory_free(ptr); |
1353 |
|
|
} |
1354 |
|
|
|
1355 |
|
|
static int ccs_gc_thread(void *unused) |
1356 |
|
|
{ |
1357 |
|
|
static DEFINE_MUTEX(ccs_gc_mutex); |
1358 |
|
|
static LIST_HEAD(ccs_gc_queue); |
1359 |
|
|
if (!mutex_trylock(&ccs_gc_mutex)) |
1360 |
|
|
return 0; |
1361 |
kumaneko |
2690 |
mutex_lock(&ccs_policy_lock); |
1362 |
kumaneko |
2701 |
{ |
1363 |
|
|
struct ccs_globally_readable_file_entry *ptr; |
1364 |
|
|
list_for_each_entry_rcu(ptr, &ccs_globally_readable_list, |
1365 |
|
|
list) { |
1366 |
|
|
if (!ptr->is_deleted) |
1367 |
|
|
continue; |
1368 |
|
|
if (ccs_add_to_gc(CCS_ID_GLOBALLY_READABLE, ptr, |
1369 |
|
|
&ccs_gc_queue)) |
1370 |
|
|
list_del_rcu(&ptr->list); |
1371 |
|
|
else |
1372 |
|
|
break; |
1373 |
kumaneko |
2540 |
} |
1374 |
kumaneko |
2701 |
} |
1375 |
|
|
{ |
1376 |
|
|
struct ccs_globally_usable_env_entry *ptr; |
1377 |
|
|
list_for_each_entry_rcu(ptr, &ccs_globally_usable_env_list, |
1378 |
|
|
list) { |
1379 |
|
|
if (!ptr->is_deleted) |
1380 |
kumaneko |
2540 |
continue; |
1381 |
kumaneko |
2701 |
if (ccs_add_to_gc(CCS_ID_GLOBAL_ENV, ptr, |
1382 |
|
|
&ccs_gc_queue)) |
1383 |
|
|
list_del_rcu(&ptr->list); |
1384 |
|
|
else |
1385 |
|
|
break; |
1386 |
kumaneko |
2540 |
} |
1387 |
kumaneko |
2701 |
} |
1388 |
|
|
{ |
1389 |
|
|
struct ccs_pattern_entry *ptr; |
1390 |
|
|
list_for_each_entry_rcu(ptr, &ccs_pattern_list, list) { |
1391 |
|
|
if (!ptr->is_deleted) |
1392 |
|
|
continue; |
1393 |
|
|
if (ccs_add_to_gc(CCS_ID_PATTERN, ptr, |
1394 |
|
|
&ccs_gc_queue)) |
1395 |
|
|
list_del_rcu(&ptr->list); |
1396 |
|
|
else |
1397 |
|
|
break; |
1398 |
kumaneko |
2540 |
} |
1399 |
|
|
} |
1400 |
kumaneko |
2701 |
{ |
1401 |
|
|
struct ccs_no_rewrite_entry *ptr; |
1402 |
|
|
list_for_each_entry_rcu(ptr, &ccs_no_rewrite_list, list) { |
1403 |
|
|
if (!ptr->is_deleted) |
1404 |
|
|
continue; |
1405 |
|
|
if (ccs_add_to_gc(CCS_ID_NO_REWRITE, ptr, |
1406 |
|
|
&ccs_gc_queue)) |
1407 |
|
|
list_del_rcu(&ptr->list); |
1408 |
kumaneko |
2540 |
else |
1409 |
kumaneko |
2701 |
break; |
1410 |
|
|
} |
1411 |
|
|
} |
1412 |
|
|
{ |
1413 |
|
|
struct ccs_domain_initializer_entry *ptr; |
1414 |
|
|
list_for_each_entry_rcu(ptr, &ccs_domain_initializer_list, |
1415 |
|
|
list) { |
1416 |
|
|
if (!ptr->is_deleted) |
1417 |
|
|
continue; |
1418 |
|
|
if (ccs_add_to_gc(CCS_ID_DOMAIN_INITIALIZER, |
1419 |
|
|
ptr, &ccs_gc_queue)) |
1420 |
|
|
list_del_rcu(&ptr->list); |
1421 |
kumaneko |
2540 |
else |
1422 |
kumaneko |
2701 |
break; |
1423 |
|
|
} |
1424 |
|
|
} |
1425 |
|
|
{ |
1426 |
|
|
struct ccs_domain_keeper_entry *ptr; |
1427 |
|
|
list_for_each_entry_rcu(ptr, &ccs_domain_keeper_list, list) { |
1428 |
|
|
if (!ptr->is_deleted) |
1429 |
|
|
continue; |
1430 |
|
|
if (ccs_add_to_gc(CCS_ID_DOMAIN_KEEPER, ptr, |
1431 |
|
|
&ccs_gc_queue)) |
1432 |
|
|
list_del_rcu(&ptr->list); |
1433 |
kumaneko |
2540 |
else |
1434 |
kumaneko |
2701 |
break; |
1435 |
|
|
} |
1436 |
|
|
} |
1437 |
|
|
{ |
1438 |
|
|
struct ccs_alias_entry *ptr; |
1439 |
|
|
list_for_each_entry_rcu(ptr, &ccs_alias_list, list) { |
1440 |
|
|
if (!ptr->is_deleted) |
1441 |
|
|
continue; |
1442 |
|
|
if (ccs_add_to_gc(CCS_ID_ALIAS, ptr, &ccs_gc_queue)) |
1443 |
|
|
list_del_rcu(&ptr->list); |
1444 |
kumaneko |
2540 |
else |
1445 |
kumaneko |
2701 |
break; |
1446 |
kumaneko |
2540 |
} |
1447 |
|
|
} |
1448 |
kumaneko |
2701 |
{ |
1449 |
|
|
struct ccs_policy_manager_entry *ptr; |
1450 |
|
|
list_for_each_entry_rcu(ptr, &ccs_policy_manager_list, list) { |
1451 |
|
|
if (!ptr->is_deleted) |
1452 |
|
|
continue; |
1453 |
|
|
if (ccs_add_to_gc(CCS_ID_MANAGER, ptr, &ccs_gc_queue)) |
1454 |
|
|
list_del_rcu(&ptr->list); |
1455 |
|
|
else |
1456 |
|
|
break; |
1457 |
|
|
} |
1458 |
kumaneko |
2540 |
} |
1459 |
kumaneko |
2701 |
{ |
1460 |
|
|
struct ccs_aggregator_entry *ptr; |
1461 |
|
|
list_for_each_entry_rcu(ptr, &ccs_aggregator_list, list) { |
1462 |
|
|
if (!ptr->is_deleted) |
1463 |
|
|
continue; |
1464 |
|
|
if (ccs_add_to_gc(CCS_ID_AGGREGATOR, ptr, |
1465 |
|
|
&ccs_gc_queue)) |
1466 |
|
|
list_del_rcu(&ptr->list); |
1467 |
|
|
else |
1468 |
kumaneko |
2575 |
break; |
1469 |
|
|
} |
1470 |
|
|
} |
1471 |
kumaneko |
2690 |
mutex_unlock(&ccs_policy_lock); |
1472 |
kumaneko |
2701 |
{ |
1473 |
|
|
struct ccs_domain_info *domain; |
1474 |
|
|
list_for_each_entry_rcu(domain, &ccs_domain_list, list) { |
1475 |
|
|
struct ccs_acl_info *acl; |
1476 |
|
|
list_for_each_entry_rcu(acl, &domain->acl_info_list, |
1477 |
|
|
list) { |
1478 |
|
|
if (!(acl->type & ACL_DELETED)) |
1479 |
|
|
continue; |
1480 |
|
|
if (ccs_add_to_gc(CCS_ID_ACL, acl, |
1481 |
|
|
&ccs_gc_queue)) |
1482 |
|
|
list_del_rcu(&acl->list); |
1483 |
|
|
else |
1484 |
|
|
break; |
1485 |
|
|
} |
1486 |
|
|
if (!domain->is_deleted || |
1487 |
|
|
ccs_used_by_task(domain)) |
1488 |
|
|
continue; |
1489 |
|
|
if (ccs_add_to_gc(CCS_ID_DOMAIN, domain, &ccs_gc_queue)) |
1490 |
|
|
list_del_rcu(&domain->list); |
1491 |
|
|
else |
1492 |
|
|
break; |
1493 |
|
|
} |
1494 |
kumaneko |
2575 |
} |
1495 |
kumaneko |
2701 |
{ |
1496 |
|
|
struct ccs_path_group_entry *group; |
1497 |
|
|
list_for_each_entry_rcu(group, &ccs_path_group_list, list) { |
1498 |
|
|
struct ccs_path_group_member *member; |
1499 |
|
|
list_for_each_entry_rcu(member, |
1500 |
|
|
&group->path_group_member_list, |
1501 |
|
|
list) { |
1502 |
|
|
if (!member->is_deleted) |
1503 |
|
|
continue; |
1504 |
|
|
if (ccs_add_to_gc(CCS_ID_PATH_GROUP_MEMBER, |
1505 |
|
|
member, &ccs_gc_queue)) |
1506 |
|
|
list_del_rcu(&member->list); |
1507 |
|
|
else |
1508 |
|
|
break; |
1509 |
|
|
} |
1510 |
|
|
if (!list_empty(&group->path_group_member_list) || |
1511 |
|
|
atomic_read(&group->users)) |
1512 |
|
|
continue; |
1513 |
|
|
if (ccs_add_to_gc(CCS_ID_PATH_GROUP, group, |
1514 |
|
|
&ccs_gc_queue)) |
1515 |
|
|
list_del_rcu(&group->list); |
1516 |
|
|
else |
1517 |
|
|
break; |
1518 |
|
|
} |
1519 |
kumaneko |
2575 |
} |
1520 |
kumaneko |
2701 |
{ |
1521 |
|
|
struct ccs_address_group_entry *group; |
1522 |
|
|
list_for_each_entry_rcu(group, &ccs_address_group_list, list) { |
1523 |
|
|
struct ccs_address_group_member *member; |
1524 |
|
|
list_for_each_entry_rcu(member, |
1525 |
|
|
&group->address_group_member_list, |
1526 |
|
|
list) { |
1527 |
|
|
if (!member->is_deleted) |
1528 |
|
|
break; |
1529 |
|
|
if (ccs_add_to_gc(CCS_ID_ADDRESS_GROUP_MEMBER, |
1530 |
|
|
member, &ccs_gc_queue)) |
1531 |
|
|
list_del_rcu(&member->list); |
1532 |
|
|
else |
1533 |
|
|
break; |
1534 |
|
|
} |
1535 |
|
|
if (!list_empty(&group->address_group_member_list) || |
1536 |
|
|
atomic_read(&group->users)) |
1537 |
|
|
continue; |
1538 |
|
|
if (ccs_add_to_gc(CCS_ID_ADDRESS_GROUP, group, |
1539 |
|
|
&ccs_gc_queue)) |
1540 |
|
|
list_del_rcu(&group->list); |
1541 |
|
|
else |
1542 |
kumaneko |
2575 |
break; |
1543 |
|
|
} |
1544 |
kumaneko |
2701 |
} |
1545 |
|
|
{ |
1546 |
|
|
struct ccs_reserved_entry *ptr; |
1547 |
|
|
list_for_each_entry_rcu(ptr, &ccs_reservedport_list, list) { |
1548 |
|
|
if (!ptr->is_deleted) |
1549 |
|
|
continue; |
1550 |
|
|
if (ccs_add_to_gc(CCS_ID_RESERVEDPORT, ptr, |
1551 |
|
|
&ccs_gc_queue)) |
1552 |
|
|
list_del_rcu(&ptr->list); |
1553 |
|
|
else |
1554 |
|
|
break; |
1555 |
|
|
} |
1556 |
kumaneko |
2575 |
} |
1557 |
kumaneko |
2701 |
{ |
1558 |
|
|
struct ccs_condition *ptr; |
1559 |
|
|
list_for_each_entry_rcu(ptr, &ccs_condition_list, list) { |
1560 |
|
|
if (atomic_read(&ptr->users)) |
1561 |
|
|
continue; |
1562 |
|
|
if (ccs_add_to_gc(CCS_ID_CONDITION, ptr, &ccs_gc_queue)) |
1563 |
|
|
list_del_rcu(&ptr->list); |
1564 |
|
|
else |
1565 |
|
|
break; |
1566 |
|
|
} |
1567 |
kumaneko |
2575 |
} |
1568 |
kumaneko |
2690 |
mutex_unlock(&ccs_policy_lock); |
1569 |
kumaneko |
2701 |
if (list_empty(&ccs_gc_queue)) |
1570 |
|
|
goto done; |
1571 |
|
|
synchronize_srcu(&ccs_ss); |
1572 |
|
|
{ |
1573 |
|
|
struct ccs_gc_entry *p; |
1574 |
|
|
struct ccs_gc_entry *tmp; |
1575 |
|
|
list_for_each_entry_safe(p, tmp, &ccs_gc_queue, list) { |
1576 |
|
|
switch (p->type) { |
1577 |
|
|
case CCS_ID_DOMAIN_INITIALIZER: |
1578 |
|
|
ccs_del_domain_initializer(p->element); |
1579 |
|
|
break; |
1580 |
|
|
case CCS_ID_DOMAIN_KEEPER: |
1581 |
|
|
ccs_del_domain_keeper(p->element); |
1582 |
|
|
break; |
1583 |
|
|
case CCS_ID_ALIAS: |
1584 |
|
|
ccs_del_alias(p->element); |
1585 |
|
|
break; |
1586 |
|
|
case CCS_ID_GLOBALLY_READABLE: |
1587 |
|
|
ccs_del_allow_read(p->element); |
1588 |
|
|
break; |
1589 |
|
|
case CCS_ID_PATTERN: |
1590 |
|
|
ccs_del_file_pattern(p->element); |
1591 |
|
|
break; |
1592 |
|
|
case CCS_ID_NO_REWRITE: |
1593 |
|
|
ccs_del_no_rewrite(p->element); |
1594 |
|
|
break; |
1595 |
|
|
case CCS_ID_MANAGER: |
1596 |
|
|
ccs_del_manager(p->element); |
1597 |
|
|
break; |
1598 |
|
|
case CCS_ID_GLOBAL_ENV: |
1599 |
|
|
ccs_del_allow_env(p->element); |
1600 |
|
|
break; |
1601 |
|
|
case CCS_ID_AGGREGATOR: |
1602 |
|
|
ccs_del_aggregator(p->element); |
1603 |
|
|
break; |
1604 |
|
|
case CCS_ID_PATH_GROUP_MEMBER: |
1605 |
|
|
ccs_del_path_group_member(p->element); |
1606 |
|
|
break; |
1607 |
|
|
case CCS_ID_PATH_GROUP: |
1608 |
|
|
ccs_del_path_group(p->element); |
1609 |
|
|
break; |
1610 |
|
|
case CCS_ID_ADDRESS_GROUP_MEMBER: |
1611 |
|
|
ccs_del_address_group_member(p->element); |
1612 |
|
|
break; |
1613 |
|
|
case CCS_ID_ADDRESS_GROUP: |
1614 |
|
|
ccs_del_address_group(p->element); |
1615 |
|
|
break; |
1616 |
|
|
case CCS_ID_RESERVEDPORT: |
1617 |
|
|
ccs_del_reservedport(p->element); |
1618 |
|
|
break; |
1619 |
|
|
case CCS_ID_CONDITION: |
1620 |
|
|
ccs_del_condition(p->element); |
1621 |
|
|
break; |
1622 |
|
|
case CCS_ID_ACL: |
1623 |
|
|
ccs_del_acl(p->element); |
1624 |
|
|
break; |
1625 |
|
|
case CCS_ID_DOMAIN: |
1626 |
|
|
if (!ccs_del_domain(p->element)) |
1627 |
|
|
continue; |
1628 |
|
|
break; |
1629 |
|
|
} |
1630 |
|
|
ccs_free_element(p->element); |
1631 |
|
|
list_del(&p->list); |
1632 |
|
|
kfree(p); |
1633 |
|
|
} |
1634 |
kumaneko |
2575 |
} |
1635 |
kumaneko |
2701 |
done: |
1636 |
|
|
mutex_unlock(&ccs_gc_mutex); |
1637 |
|
|
return 0; |
1638 |
kumaneko |
2575 |
} |
1639 |
|
|
|
1640 |
kumaneko |
2701 |
#if 0 && LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 19) |
1641 |
kumaneko |
2575 |
|
1642 |
kumaneko |
2701 |
static struct srcu_struct { |
1643 |
|
|
int counter_idx; |
1644 |
|
|
int counter[2]; |
1645 |
|
|
} ccs_ss; |
1646 |
|
|
static DEFINE_SPINLOCK(ccs_counter_lock); |
1647 |
|
|
|
1648 |
|
|
int ccs_read_lock(struct srcu_struct *sp) |
1649 |
kumaneko |
2575 |
{ |
1650 |
kumaneko |
2701 |
int idx; |
1651 |
|
|
spin_lock(&ccs_counter_lock); |
1652 |
|
|
idx = sp->counter_idx; |
1653 |
|
|
sp->counter[idx]++; |
1654 |
|
|
spin_unlock(&ccs_counter_lock); |
1655 |
|
|
return idx; |
1656 |
kumaneko |
2575 |
} |
1657 |
|
|
|
1658 |
kumaneko |
2701 |
void ccs_read_unlock(struct srcu_struct *sp, const int idx) |
1659 |
kumaneko |
2575 |
{ |
1660 |
kumaneko |
2701 |
spin_lock(&ccs_counter_lock); |
1661 |
|
|
sp->counter[idx]--; |
1662 |
|
|
spin_unlock(&ccs_counter_lock); |
1663 |
kumaneko |
2575 |
} |
1664 |
|
|
|
1665 |
kumaneko |
2701 |
void ccs_wait_readers(struct srcu_struct *sp) |
1666 |
kumaneko |
2576 |
{ |
1667 |
kumaneko |
2701 |
int idx; |
1668 |
|
|
int v; |
1669 |
|
|
spin_lock(&ccs_counter_lock); |
1670 |
|
|
idx = sp->counter_idx; |
1671 |
|
|
sp->counter_idx ^= 1; |
1672 |
|
|
v = sp->counter[idx]; |
1673 |
|
|
spin_unlock(&ccs_counter_lock); |
1674 |
|
|
while (v) { |
1675 |
|
|
msleep(1000); |
1676 |
|
|
spin_lock(&ccs_counter_lock); |
1677 |
|
|
v = sp->counter[idx]; |
1678 |
|
|
spin_unlock(&ccs_counter_lock); |
1679 |
kumaneko |
2576 |
} |
1680 |
|
|
} |
1681 |
|
|
|
1682 |
kumaneko |
2701 |
#endif |