Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* Updated: Karl MacMillan <kmacmillan@tresys.com> |
| 2 | * |
| 3 | * Added conditional policy language extensions |
| 4 | * |
| 5 | * Copyright (C) 2003 - 2004 Tresys Technology, LLC |
| 6 | * Copyright (C) 2004 Red Hat, Inc., James Morris <jmorris@redhat.com> |
| 7 | * This program is free software; you can redistribute it and/or modify |
| 8 | * it under the terms of the GNU General Public License as published by |
| 9 | * the Free Software Foundation, version 2. |
| 10 | */ |
| 11 | |
| 12 | #include <linux/config.h> |
| 13 | #include <linux/kernel.h> |
| 14 | #include <linux/pagemap.h> |
| 15 | #include <linux/slab.h> |
| 16 | #include <linux/vmalloc.h> |
| 17 | #include <linux/fs.h> |
Ingo Molnar | bb00307 | 2006-03-22 00:09:14 -0800 | [diff] [blame^] | 18 | #include <linux/mutex.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 19 | #include <linux/init.h> |
| 20 | #include <linux/string.h> |
| 21 | #include <linux/security.h> |
| 22 | #include <linux/major.h> |
| 23 | #include <linux/seq_file.h> |
| 24 | #include <linux/percpu.h> |
| 25 | #include <asm/uaccess.h> |
| 26 | #include <asm/semaphore.h> |
| 27 | |
| 28 | /* selinuxfs pseudo filesystem for exporting the security policy API. |
| 29 | Based on the proc code and the fs/nfsd/nfsctl.c code. */ |
| 30 | |
| 31 | #include "flask.h" |
| 32 | #include "avc.h" |
| 33 | #include "avc_ss.h" |
| 34 | #include "security.h" |
| 35 | #include "objsec.h" |
| 36 | #include "conditional.h" |
| 37 | |
| 38 | unsigned int selinux_checkreqprot = CONFIG_SECURITY_SELINUX_CHECKREQPROT_VALUE; |
| 39 | |
| 40 | static int __init checkreqprot_setup(char *str) |
| 41 | { |
| 42 | selinux_checkreqprot = simple_strtoul(str,NULL,0) ? 1 : 0; |
| 43 | return 1; |
| 44 | } |
| 45 | __setup("checkreqprot=", checkreqprot_setup); |
| 46 | |
| 47 | |
Ingo Molnar | bb00307 | 2006-03-22 00:09:14 -0800 | [diff] [blame^] | 48 | static DEFINE_MUTEX(sel_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 49 | |
| 50 | /* global data for booleans */ |
| 51 | static struct dentry *bool_dir = NULL; |
| 52 | static int bool_num = 0; |
| 53 | static int *bool_pending_values = NULL; |
| 54 | |
| 55 | extern void selnl_notify_setenforce(int val); |
| 56 | |
| 57 | /* Check whether a task is allowed to use a security operation. */ |
| 58 | static int task_has_security(struct task_struct *tsk, |
| 59 | u32 perms) |
| 60 | { |
| 61 | struct task_security_struct *tsec; |
| 62 | |
| 63 | tsec = tsk->security; |
| 64 | if (!tsec) |
| 65 | return -EACCES; |
| 66 | |
| 67 | return avc_has_perm(tsec->sid, SECINITSID_SECURITY, |
| 68 | SECCLASS_SECURITY, perms, NULL); |
| 69 | } |
| 70 | |
| 71 | enum sel_inos { |
| 72 | SEL_ROOT_INO = 2, |
| 73 | SEL_LOAD, /* load policy */ |
| 74 | SEL_ENFORCE, /* get or set enforcing status */ |
| 75 | SEL_CONTEXT, /* validate context */ |
| 76 | SEL_ACCESS, /* compute access decision */ |
| 77 | SEL_CREATE, /* compute create labeling decision */ |
| 78 | SEL_RELABEL, /* compute relabeling decision */ |
| 79 | SEL_USER, /* compute reachable user contexts */ |
| 80 | SEL_POLICYVERS, /* return policy version for this kernel */ |
| 81 | SEL_COMMIT_BOOLS, /* commit new boolean values */ |
| 82 | SEL_MLS, /* return if MLS policy is enabled */ |
| 83 | SEL_DISABLE, /* disable SELinux until next reboot */ |
| 84 | SEL_AVC, /* AVC management directory */ |
| 85 | SEL_MEMBER, /* compute polyinstantiation membership decision */ |
| 86 | SEL_CHECKREQPROT, /* check requested protection, not kernel-applied one */ |
| 87 | }; |
| 88 | |
| 89 | #define TMPBUFLEN 12 |
| 90 | static ssize_t sel_read_enforce(struct file *filp, char __user *buf, |
| 91 | size_t count, loff_t *ppos) |
| 92 | { |
| 93 | char tmpbuf[TMPBUFLEN]; |
| 94 | ssize_t length; |
| 95 | |
| 96 | length = scnprintf(tmpbuf, TMPBUFLEN, "%d", selinux_enforcing); |
| 97 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); |
| 98 | } |
| 99 | |
| 100 | #ifdef CONFIG_SECURITY_SELINUX_DEVELOP |
| 101 | static ssize_t sel_write_enforce(struct file * file, const char __user * buf, |
| 102 | size_t count, loff_t *ppos) |
| 103 | |
| 104 | { |
| 105 | char *page; |
| 106 | ssize_t length; |
| 107 | int new_value; |
| 108 | |
Davi Arnaut | bfd5162 | 2005-10-30 14:59:24 -0800 | [diff] [blame] | 109 | if (count >= PAGE_SIZE) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 110 | return -ENOMEM; |
| 111 | if (*ppos != 0) { |
| 112 | /* No partial writes. */ |
| 113 | return -EINVAL; |
| 114 | } |
| 115 | page = (char*)get_zeroed_page(GFP_KERNEL); |
| 116 | if (!page) |
| 117 | return -ENOMEM; |
| 118 | length = -EFAULT; |
| 119 | if (copy_from_user(page, buf, count)) |
| 120 | goto out; |
| 121 | |
| 122 | length = -EINVAL; |
| 123 | if (sscanf(page, "%d", &new_value) != 1) |
| 124 | goto out; |
| 125 | |
| 126 | if (new_value != selinux_enforcing) { |
| 127 | length = task_has_security(current, SECURITY__SETENFORCE); |
| 128 | if (length) |
| 129 | goto out; |
| 130 | selinux_enforcing = new_value; |
| 131 | if (selinux_enforcing) |
| 132 | avc_ss_reset(0); |
| 133 | selnl_notify_setenforce(selinux_enforcing); |
| 134 | } |
| 135 | length = count; |
| 136 | out: |
| 137 | free_page((unsigned long) page); |
| 138 | return length; |
| 139 | } |
| 140 | #else |
| 141 | #define sel_write_enforce NULL |
| 142 | #endif |
| 143 | |
| 144 | static struct file_operations sel_enforce_ops = { |
| 145 | .read = sel_read_enforce, |
| 146 | .write = sel_write_enforce, |
| 147 | }; |
| 148 | |
| 149 | #ifdef CONFIG_SECURITY_SELINUX_DISABLE |
| 150 | static ssize_t sel_write_disable(struct file * file, const char __user * buf, |
| 151 | size_t count, loff_t *ppos) |
| 152 | |
| 153 | { |
| 154 | char *page; |
| 155 | ssize_t length; |
| 156 | int new_value; |
| 157 | extern int selinux_disable(void); |
| 158 | |
Davi Arnaut | bfd5162 | 2005-10-30 14:59:24 -0800 | [diff] [blame] | 159 | if (count >= PAGE_SIZE) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 160 | return -ENOMEM; |
| 161 | if (*ppos != 0) { |
| 162 | /* No partial writes. */ |
| 163 | return -EINVAL; |
| 164 | } |
| 165 | page = (char*)get_zeroed_page(GFP_KERNEL); |
| 166 | if (!page) |
| 167 | return -ENOMEM; |
| 168 | length = -EFAULT; |
| 169 | if (copy_from_user(page, buf, count)) |
| 170 | goto out; |
| 171 | |
| 172 | length = -EINVAL; |
| 173 | if (sscanf(page, "%d", &new_value) != 1) |
| 174 | goto out; |
| 175 | |
| 176 | if (new_value) { |
| 177 | length = selinux_disable(); |
| 178 | if (length < 0) |
| 179 | goto out; |
| 180 | } |
| 181 | |
| 182 | length = count; |
| 183 | out: |
| 184 | free_page((unsigned long) page); |
| 185 | return length; |
| 186 | } |
| 187 | #else |
| 188 | #define sel_write_disable NULL |
| 189 | #endif |
| 190 | |
| 191 | static struct file_operations sel_disable_ops = { |
| 192 | .write = sel_write_disable, |
| 193 | }; |
| 194 | |
| 195 | static ssize_t sel_read_policyvers(struct file *filp, char __user *buf, |
| 196 | size_t count, loff_t *ppos) |
| 197 | { |
| 198 | char tmpbuf[TMPBUFLEN]; |
| 199 | ssize_t length; |
| 200 | |
| 201 | length = scnprintf(tmpbuf, TMPBUFLEN, "%u", POLICYDB_VERSION_MAX); |
| 202 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); |
| 203 | } |
| 204 | |
| 205 | static struct file_operations sel_policyvers_ops = { |
| 206 | .read = sel_read_policyvers, |
| 207 | }; |
| 208 | |
| 209 | /* declaration for sel_write_load */ |
| 210 | static int sel_make_bools(void); |
| 211 | |
| 212 | static ssize_t sel_read_mls(struct file *filp, char __user *buf, |
| 213 | size_t count, loff_t *ppos) |
| 214 | { |
| 215 | char tmpbuf[TMPBUFLEN]; |
| 216 | ssize_t length; |
| 217 | |
| 218 | length = scnprintf(tmpbuf, TMPBUFLEN, "%d", selinux_mls_enabled); |
| 219 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); |
| 220 | } |
| 221 | |
| 222 | static struct file_operations sel_mls_ops = { |
| 223 | .read = sel_read_mls, |
| 224 | }; |
| 225 | |
| 226 | static ssize_t sel_write_load(struct file * file, const char __user * buf, |
| 227 | size_t count, loff_t *ppos) |
| 228 | |
| 229 | { |
| 230 | int ret; |
| 231 | ssize_t length; |
| 232 | void *data = NULL; |
| 233 | |
Ingo Molnar | bb00307 | 2006-03-22 00:09:14 -0800 | [diff] [blame^] | 234 | mutex_lock(&sel_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 235 | |
| 236 | length = task_has_security(current, SECURITY__LOAD_POLICY); |
| 237 | if (length) |
| 238 | goto out; |
| 239 | |
| 240 | if (*ppos != 0) { |
| 241 | /* No partial writes. */ |
| 242 | length = -EINVAL; |
| 243 | goto out; |
| 244 | } |
| 245 | |
Davi Arnaut | bfd5162 | 2005-10-30 14:59:24 -0800 | [diff] [blame] | 246 | if ((count > 64 * 1024 * 1024) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 247 | || (data = vmalloc(count)) == NULL) { |
| 248 | length = -ENOMEM; |
| 249 | goto out; |
| 250 | } |
| 251 | |
| 252 | length = -EFAULT; |
| 253 | if (copy_from_user(data, buf, count) != 0) |
| 254 | goto out; |
| 255 | |
| 256 | length = security_load_policy(data, count); |
| 257 | if (length) |
| 258 | goto out; |
| 259 | |
| 260 | ret = sel_make_bools(); |
| 261 | if (ret) |
| 262 | length = ret; |
| 263 | else |
| 264 | length = count; |
| 265 | out: |
Ingo Molnar | bb00307 | 2006-03-22 00:09:14 -0800 | [diff] [blame^] | 266 | mutex_unlock(&sel_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 267 | vfree(data); |
| 268 | return length; |
| 269 | } |
| 270 | |
| 271 | static struct file_operations sel_load_ops = { |
| 272 | .write = sel_write_load, |
| 273 | }; |
| 274 | |
Stephen Smalley | ce9982d | 2005-11-08 21:34:33 -0800 | [diff] [blame] | 275 | static ssize_t sel_write_context(struct file * file, char *buf, size_t size) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 276 | { |
Stephen Smalley | ce9982d | 2005-11-08 21:34:33 -0800 | [diff] [blame] | 277 | char *canon; |
| 278 | u32 sid, len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 279 | ssize_t length; |
| 280 | |
| 281 | length = task_has_security(current, SECURITY__CHECK_CONTEXT); |
| 282 | if (length) |
| 283 | return length; |
| 284 | |
Stephen Smalley | ce9982d | 2005-11-08 21:34:33 -0800 | [diff] [blame] | 285 | length = security_context_to_sid(buf, size, &sid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 286 | if (length < 0) |
Stephen Smalley | ce9982d | 2005-11-08 21:34:33 -0800 | [diff] [blame] | 287 | return length; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 288 | |
Stephen Smalley | ce9982d | 2005-11-08 21:34:33 -0800 | [diff] [blame] | 289 | length = security_sid_to_context(sid, &canon, &len); |
| 290 | if (length < 0) |
| 291 | return length; |
| 292 | |
| 293 | if (len > SIMPLE_TRANSACTION_LIMIT) { |
| 294 | printk(KERN_ERR "%s: context size (%u) exceeds payload " |
| 295 | "max\n", __FUNCTION__, len); |
| 296 | length = -ERANGE; |
| 297 | goto out; |
| 298 | } |
| 299 | |
| 300 | memcpy(buf, canon, len); |
| 301 | length = len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 302 | out: |
Stephen Smalley | ce9982d | 2005-11-08 21:34:33 -0800 | [diff] [blame] | 303 | kfree(canon); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 304 | return length; |
| 305 | } |
| 306 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 307 | static ssize_t sel_read_checkreqprot(struct file *filp, char __user *buf, |
| 308 | size_t count, loff_t *ppos) |
| 309 | { |
| 310 | char tmpbuf[TMPBUFLEN]; |
| 311 | ssize_t length; |
| 312 | |
| 313 | length = scnprintf(tmpbuf, TMPBUFLEN, "%u", selinux_checkreqprot); |
| 314 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); |
| 315 | } |
| 316 | |
| 317 | static ssize_t sel_write_checkreqprot(struct file * file, const char __user * buf, |
| 318 | size_t count, loff_t *ppos) |
| 319 | { |
| 320 | char *page; |
| 321 | ssize_t length; |
| 322 | unsigned int new_value; |
| 323 | |
| 324 | length = task_has_security(current, SECURITY__SETCHECKREQPROT); |
| 325 | if (length) |
| 326 | return length; |
| 327 | |
Davi Arnaut | bfd5162 | 2005-10-30 14:59:24 -0800 | [diff] [blame] | 328 | if (count >= PAGE_SIZE) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 329 | return -ENOMEM; |
| 330 | if (*ppos != 0) { |
| 331 | /* No partial writes. */ |
| 332 | return -EINVAL; |
| 333 | } |
| 334 | page = (char*)get_zeroed_page(GFP_KERNEL); |
| 335 | if (!page) |
| 336 | return -ENOMEM; |
| 337 | length = -EFAULT; |
| 338 | if (copy_from_user(page, buf, count)) |
| 339 | goto out; |
| 340 | |
| 341 | length = -EINVAL; |
| 342 | if (sscanf(page, "%u", &new_value) != 1) |
| 343 | goto out; |
| 344 | |
| 345 | selinux_checkreqprot = new_value ? 1 : 0; |
| 346 | length = count; |
| 347 | out: |
| 348 | free_page((unsigned long) page); |
| 349 | return length; |
| 350 | } |
| 351 | static struct file_operations sel_checkreqprot_ops = { |
| 352 | .read = sel_read_checkreqprot, |
| 353 | .write = sel_write_checkreqprot, |
| 354 | }; |
| 355 | |
| 356 | /* |
| 357 | * Remaining nodes use transaction based IO methods like nfsd/nfsctl.c |
| 358 | */ |
| 359 | static ssize_t sel_write_access(struct file * file, char *buf, size_t size); |
| 360 | static ssize_t sel_write_create(struct file * file, char *buf, size_t size); |
| 361 | static ssize_t sel_write_relabel(struct file * file, char *buf, size_t size); |
| 362 | static ssize_t sel_write_user(struct file * file, char *buf, size_t size); |
| 363 | static ssize_t sel_write_member(struct file * file, char *buf, size_t size); |
| 364 | |
| 365 | static ssize_t (*write_op[])(struct file *, char *, size_t) = { |
| 366 | [SEL_ACCESS] = sel_write_access, |
| 367 | [SEL_CREATE] = sel_write_create, |
| 368 | [SEL_RELABEL] = sel_write_relabel, |
| 369 | [SEL_USER] = sel_write_user, |
| 370 | [SEL_MEMBER] = sel_write_member, |
Stephen Smalley | ce9982d | 2005-11-08 21:34:33 -0800 | [diff] [blame] | 371 | [SEL_CONTEXT] = sel_write_context, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 372 | }; |
| 373 | |
| 374 | static ssize_t selinux_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos) |
| 375 | { |
| 376 | ino_t ino = file->f_dentry->d_inode->i_ino; |
| 377 | char *data; |
| 378 | ssize_t rv; |
| 379 | |
Nicolas Kaiser | 6e20a64 | 2006-01-06 00:11:22 -0800 | [diff] [blame] | 380 | if (ino >= ARRAY_SIZE(write_op) || !write_op[ino]) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 381 | return -EINVAL; |
| 382 | |
| 383 | data = simple_transaction_get(file, buf, size); |
| 384 | if (IS_ERR(data)) |
| 385 | return PTR_ERR(data); |
| 386 | |
| 387 | rv = write_op[ino](file, data, size); |
| 388 | if (rv>0) { |
| 389 | simple_transaction_set(file, rv); |
| 390 | rv = size; |
| 391 | } |
| 392 | return rv; |
| 393 | } |
| 394 | |
| 395 | static struct file_operations transaction_ops = { |
| 396 | .write = selinux_transaction_write, |
| 397 | .read = simple_transaction_read, |
| 398 | .release = simple_transaction_release, |
| 399 | }; |
| 400 | |
| 401 | /* |
| 402 | * payload - write methods |
| 403 | * If the method has a response, the response should be put in buf, |
| 404 | * and the length returned. Otherwise return 0 or and -error. |
| 405 | */ |
| 406 | |
| 407 | static ssize_t sel_write_access(struct file * file, char *buf, size_t size) |
| 408 | { |
| 409 | char *scon, *tcon; |
| 410 | u32 ssid, tsid; |
| 411 | u16 tclass; |
| 412 | u32 req; |
| 413 | struct av_decision avd; |
| 414 | ssize_t length; |
| 415 | |
| 416 | length = task_has_security(current, SECURITY__COMPUTE_AV); |
| 417 | if (length) |
| 418 | return length; |
| 419 | |
| 420 | length = -ENOMEM; |
James Morris | 89d155e | 2005-10-30 14:59:21 -0800 | [diff] [blame] | 421 | scon = kzalloc(size+1, GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 422 | if (!scon) |
| 423 | return length; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 424 | |
James Morris | 89d155e | 2005-10-30 14:59:21 -0800 | [diff] [blame] | 425 | tcon = kzalloc(size+1, GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 426 | if (!tcon) |
| 427 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 428 | |
| 429 | length = -EINVAL; |
| 430 | if (sscanf(buf, "%s %s %hu %x", scon, tcon, &tclass, &req) != 4) |
| 431 | goto out2; |
| 432 | |
| 433 | length = security_context_to_sid(scon, strlen(scon)+1, &ssid); |
| 434 | if (length < 0) |
| 435 | goto out2; |
| 436 | length = security_context_to_sid(tcon, strlen(tcon)+1, &tsid); |
| 437 | if (length < 0) |
| 438 | goto out2; |
| 439 | |
| 440 | length = security_compute_av(ssid, tsid, tclass, req, &avd); |
| 441 | if (length < 0) |
| 442 | goto out2; |
| 443 | |
| 444 | length = scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, |
| 445 | "%x %x %x %x %u", |
| 446 | avd.allowed, avd.decided, |
| 447 | avd.auditallow, avd.auditdeny, |
| 448 | avd.seqno); |
| 449 | out2: |
| 450 | kfree(tcon); |
| 451 | out: |
| 452 | kfree(scon); |
| 453 | return length; |
| 454 | } |
| 455 | |
| 456 | static ssize_t sel_write_create(struct file * file, char *buf, size_t size) |
| 457 | { |
| 458 | char *scon, *tcon; |
| 459 | u32 ssid, tsid, newsid; |
| 460 | u16 tclass; |
| 461 | ssize_t length; |
| 462 | char *newcon; |
| 463 | u32 len; |
| 464 | |
| 465 | length = task_has_security(current, SECURITY__COMPUTE_CREATE); |
| 466 | if (length) |
| 467 | return length; |
| 468 | |
| 469 | length = -ENOMEM; |
James Morris | 89d155e | 2005-10-30 14:59:21 -0800 | [diff] [blame] | 470 | scon = kzalloc(size+1, GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 471 | if (!scon) |
| 472 | return length; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 473 | |
James Morris | 89d155e | 2005-10-30 14:59:21 -0800 | [diff] [blame] | 474 | tcon = kzalloc(size+1, GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 475 | if (!tcon) |
| 476 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 477 | |
| 478 | length = -EINVAL; |
| 479 | if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3) |
| 480 | goto out2; |
| 481 | |
| 482 | length = security_context_to_sid(scon, strlen(scon)+1, &ssid); |
| 483 | if (length < 0) |
| 484 | goto out2; |
| 485 | length = security_context_to_sid(tcon, strlen(tcon)+1, &tsid); |
| 486 | if (length < 0) |
| 487 | goto out2; |
| 488 | |
| 489 | length = security_transition_sid(ssid, tsid, tclass, &newsid); |
| 490 | if (length < 0) |
| 491 | goto out2; |
| 492 | |
| 493 | length = security_sid_to_context(newsid, &newcon, &len); |
| 494 | if (length < 0) |
| 495 | goto out2; |
| 496 | |
| 497 | if (len > SIMPLE_TRANSACTION_LIMIT) { |
| 498 | printk(KERN_ERR "%s: context size (%u) exceeds payload " |
| 499 | "max\n", __FUNCTION__, len); |
| 500 | length = -ERANGE; |
| 501 | goto out3; |
| 502 | } |
| 503 | |
| 504 | memcpy(buf, newcon, len); |
| 505 | length = len; |
| 506 | out3: |
| 507 | kfree(newcon); |
| 508 | out2: |
| 509 | kfree(tcon); |
| 510 | out: |
| 511 | kfree(scon); |
| 512 | return length; |
| 513 | } |
| 514 | |
| 515 | static ssize_t sel_write_relabel(struct file * file, char *buf, size_t size) |
| 516 | { |
| 517 | char *scon, *tcon; |
| 518 | u32 ssid, tsid, newsid; |
| 519 | u16 tclass; |
| 520 | ssize_t length; |
| 521 | char *newcon; |
| 522 | u32 len; |
| 523 | |
| 524 | length = task_has_security(current, SECURITY__COMPUTE_RELABEL); |
| 525 | if (length) |
| 526 | return length; |
| 527 | |
| 528 | length = -ENOMEM; |
James Morris | 89d155e | 2005-10-30 14:59:21 -0800 | [diff] [blame] | 529 | scon = kzalloc(size+1, GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 530 | if (!scon) |
| 531 | return length; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 532 | |
James Morris | 89d155e | 2005-10-30 14:59:21 -0800 | [diff] [blame] | 533 | tcon = kzalloc(size+1, GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 534 | if (!tcon) |
| 535 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 536 | |
| 537 | length = -EINVAL; |
| 538 | if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3) |
| 539 | goto out2; |
| 540 | |
| 541 | length = security_context_to_sid(scon, strlen(scon)+1, &ssid); |
| 542 | if (length < 0) |
| 543 | goto out2; |
| 544 | length = security_context_to_sid(tcon, strlen(tcon)+1, &tsid); |
| 545 | if (length < 0) |
| 546 | goto out2; |
| 547 | |
| 548 | length = security_change_sid(ssid, tsid, tclass, &newsid); |
| 549 | if (length < 0) |
| 550 | goto out2; |
| 551 | |
| 552 | length = security_sid_to_context(newsid, &newcon, &len); |
| 553 | if (length < 0) |
| 554 | goto out2; |
| 555 | |
| 556 | if (len > SIMPLE_TRANSACTION_LIMIT) { |
| 557 | length = -ERANGE; |
| 558 | goto out3; |
| 559 | } |
| 560 | |
| 561 | memcpy(buf, newcon, len); |
| 562 | length = len; |
| 563 | out3: |
| 564 | kfree(newcon); |
| 565 | out2: |
| 566 | kfree(tcon); |
| 567 | out: |
| 568 | kfree(scon); |
| 569 | return length; |
| 570 | } |
| 571 | |
| 572 | static ssize_t sel_write_user(struct file * file, char *buf, size_t size) |
| 573 | { |
| 574 | char *con, *user, *ptr; |
| 575 | u32 sid, *sids; |
| 576 | ssize_t length; |
| 577 | char *newcon; |
| 578 | int i, rc; |
| 579 | u32 len, nsids; |
| 580 | |
| 581 | length = task_has_security(current, SECURITY__COMPUTE_USER); |
| 582 | if (length) |
| 583 | return length; |
| 584 | |
| 585 | length = -ENOMEM; |
James Morris | 89d155e | 2005-10-30 14:59:21 -0800 | [diff] [blame] | 586 | con = kzalloc(size+1, GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 587 | if (!con) |
| 588 | return length; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 589 | |
James Morris | 89d155e | 2005-10-30 14:59:21 -0800 | [diff] [blame] | 590 | user = kzalloc(size+1, GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 591 | if (!user) |
| 592 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 593 | |
| 594 | length = -EINVAL; |
| 595 | if (sscanf(buf, "%s %s", con, user) != 2) |
| 596 | goto out2; |
| 597 | |
| 598 | length = security_context_to_sid(con, strlen(con)+1, &sid); |
| 599 | if (length < 0) |
| 600 | goto out2; |
| 601 | |
| 602 | length = security_get_user_sids(sid, user, &sids, &nsids); |
| 603 | if (length < 0) |
| 604 | goto out2; |
| 605 | |
| 606 | length = sprintf(buf, "%u", nsids) + 1; |
| 607 | ptr = buf + length; |
| 608 | for (i = 0; i < nsids; i++) { |
| 609 | rc = security_sid_to_context(sids[i], &newcon, &len); |
| 610 | if (rc) { |
| 611 | length = rc; |
| 612 | goto out3; |
| 613 | } |
| 614 | if ((length + len) >= SIMPLE_TRANSACTION_LIMIT) { |
| 615 | kfree(newcon); |
| 616 | length = -ERANGE; |
| 617 | goto out3; |
| 618 | } |
| 619 | memcpy(ptr, newcon, len); |
| 620 | kfree(newcon); |
| 621 | ptr += len; |
| 622 | length += len; |
| 623 | } |
| 624 | out3: |
| 625 | kfree(sids); |
| 626 | out2: |
| 627 | kfree(user); |
| 628 | out: |
| 629 | kfree(con); |
| 630 | return length; |
| 631 | } |
| 632 | |
| 633 | static ssize_t sel_write_member(struct file * file, char *buf, size_t size) |
| 634 | { |
| 635 | char *scon, *tcon; |
| 636 | u32 ssid, tsid, newsid; |
| 637 | u16 tclass; |
| 638 | ssize_t length; |
| 639 | char *newcon; |
| 640 | u32 len; |
| 641 | |
| 642 | length = task_has_security(current, SECURITY__COMPUTE_MEMBER); |
| 643 | if (length) |
| 644 | return length; |
| 645 | |
| 646 | length = -ENOMEM; |
James Morris | 89d155e | 2005-10-30 14:59:21 -0800 | [diff] [blame] | 647 | scon = kzalloc(size+1, GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 648 | if (!scon) |
| 649 | return length; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 650 | |
James Morris | 89d155e | 2005-10-30 14:59:21 -0800 | [diff] [blame] | 651 | tcon = kzalloc(size+1, GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 652 | if (!tcon) |
| 653 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 654 | |
| 655 | length = -EINVAL; |
| 656 | if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3) |
| 657 | goto out2; |
| 658 | |
| 659 | length = security_context_to_sid(scon, strlen(scon)+1, &ssid); |
| 660 | if (length < 0) |
| 661 | goto out2; |
| 662 | length = security_context_to_sid(tcon, strlen(tcon)+1, &tsid); |
| 663 | if (length < 0) |
| 664 | goto out2; |
| 665 | |
| 666 | length = security_member_sid(ssid, tsid, tclass, &newsid); |
| 667 | if (length < 0) |
| 668 | goto out2; |
| 669 | |
| 670 | length = security_sid_to_context(newsid, &newcon, &len); |
| 671 | if (length < 0) |
| 672 | goto out2; |
| 673 | |
| 674 | if (len > SIMPLE_TRANSACTION_LIMIT) { |
| 675 | printk(KERN_ERR "%s: context size (%u) exceeds payload " |
| 676 | "max\n", __FUNCTION__, len); |
| 677 | length = -ERANGE; |
| 678 | goto out3; |
| 679 | } |
| 680 | |
| 681 | memcpy(buf, newcon, len); |
| 682 | length = len; |
| 683 | out3: |
| 684 | kfree(newcon); |
| 685 | out2: |
| 686 | kfree(tcon); |
| 687 | out: |
| 688 | kfree(scon); |
| 689 | return length; |
| 690 | } |
| 691 | |
| 692 | static struct inode *sel_make_inode(struct super_block *sb, int mode) |
| 693 | { |
| 694 | struct inode *ret = new_inode(sb); |
| 695 | |
| 696 | if (ret) { |
| 697 | ret->i_mode = mode; |
| 698 | ret->i_uid = ret->i_gid = 0; |
| 699 | ret->i_blksize = PAGE_CACHE_SIZE; |
| 700 | ret->i_blocks = 0; |
| 701 | ret->i_atime = ret->i_mtime = ret->i_ctime = CURRENT_TIME; |
| 702 | } |
| 703 | return ret; |
| 704 | } |
| 705 | |
| 706 | #define BOOL_INO_OFFSET 30 |
| 707 | |
| 708 | static ssize_t sel_read_bool(struct file *filep, char __user *buf, |
| 709 | size_t count, loff_t *ppos) |
| 710 | { |
| 711 | char *page = NULL; |
| 712 | ssize_t length; |
| 713 | ssize_t end; |
| 714 | ssize_t ret; |
| 715 | int cur_enforcing; |
| 716 | struct inode *inode; |
| 717 | |
Ingo Molnar | bb00307 | 2006-03-22 00:09:14 -0800 | [diff] [blame^] | 718 | mutex_lock(&sel_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 719 | |
| 720 | ret = -EFAULT; |
| 721 | |
| 722 | /* check to see if this file has been deleted */ |
| 723 | if (!filep->f_op) |
| 724 | goto out; |
| 725 | |
Davi Arnaut | bfd5162 | 2005-10-30 14:59:24 -0800 | [diff] [blame] | 726 | if (count > PAGE_SIZE) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 727 | ret = -EINVAL; |
| 728 | goto out; |
| 729 | } |
| 730 | if (!(page = (char*)get_zeroed_page(GFP_KERNEL))) { |
| 731 | ret = -ENOMEM; |
| 732 | goto out; |
| 733 | } |
| 734 | |
| 735 | inode = filep->f_dentry->d_inode; |
| 736 | cur_enforcing = security_get_bool_value(inode->i_ino - BOOL_INO_OFFSET); |
| 737 | if (cur_enforcing < 0) { |
| 738 | ret = cur_enforcing; |
| 739 | goto out; |
| 740 | } |
| 741 | |
| 742 | length = scnprintf(page, PAGE_SIZE, "%d %d", cur_enforcing, |
| 743 | bool_pending_values[inode->i_ino - BOOL_INO_OFFSET]); |
| 744 | if (length < 0) { |
| 745 | ret = length; |
| 746 | goto out; |
| 747 | } |
| 748 | |
| 749 | if (*ppos >= length) { |
| 750 | ret = 0; |
| 751 | goto out; |
| 752 | } |
| 753 | if (count + *ppos > length) |
| 754 | count = length - *ppos; |
| 755 | end = count + *ppos; |
| 756 | if (copy_to_user(buf, (char *) page + *ppos, count)) { |
| 757 | ret = -EFAULT; |
| 758 | goto out; |
| 759 | } |
| 760 | *ppos = end; |
| 761 | ret = count; |
| 762 | out: |
Ingo Molnar | bb00307 | 2006-03-22 00:09:14 -0800 | [diff] [blame^] | 763 | mutex_unlock(&sel_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 764 | if (page) |
| 765 | free_page((unsigned long)page); |
| 766 | return ret; |
| 767 | } |
| 768 | |
| 769 | static ssize_t sel_write_bool(struct file *filep, const char __user *buf, |
| 770 | size_t count, loff_t *ppos) |
| 771 | { |
| 772 | char *page = NULL; |
| 773 | ssize_t length = -EFAULT; |
| 774 | int new_value; |
| 775 | struct inode *inode; |
| 776 | |
Ingo Molnar | bb00307 | 2006-03-22 00:09:14 -0800 | [diff] [blame^] | 777 | mutex_lock(&sel_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 778 | |
| 779 | length = task_has_security(current, SECURITY__SETBOOL); |
| 780 | if (length) |
| 781 | goto out; |
| 782 | |
| 783 | /* check to see if this file has been deleted */ |
| 784 | if (!filep->f_op) |
| 785 | goto out; |
| 786 | |
Davi Arnaut | bfd5162 | 2005-10-30 14:59:24 -0800 | [diff] [blame] | 787 | if (count >= PAGE_SIZE) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 788 | length = -ENOMEM; |
| 789 | goto out; |
| 790 | } |
| 791 | if (*ppos != 0) { |
| 792 | /* No partial writes. */ |
| 793 | goto out; |
| 794 | } |
| 795 | page = (char*)get_zeroed_page(GFP_KERNEL); |
| 796 | if (!page) { |
| 797 | length = -ENOMEM; |
| 798 | goto out; |
| 799 | } |
| 800 | |
| 801 | if (copy_from_user(page, buf, count)) |
| 802 | goto out; |
| 803 | |
| 804 | length = -EINVAL; |
| 805 | if (sscanf(page, "%d", &new_value) != 1) |
| 806 | goto out; |
| 807 | |
| 808 | if (new_value) |
| 809 | new_value = 1; |
| 810 | |
| 811 | inode = filep->f_dentry->d_inode; |
| 812 | bool_pending_values[inode->i_ino - BOOL_INO_OFFSET] = new_value; |
| 813 | length = count; |
| 814 | |
| 815 | out: |
Ingo Molnar | bb00307 | 2006-03-22 00:09:14 -0800 | [diff] [blame^] | 816 | mutex_unlock(&sel_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 817 | if (page) |
| 818 | free_page((unsigned long) page); |
| 819 | return length; |
| 820 | } |
| 821 | |
| 822 | static struct file_operations sel_bool_ops = { |
| 823 | .read = sel_read_bool, |
| 824 | .write = sel_write_bool, |
| 825 | }; |
| 826 | |
| 827 | static ssize_t sel_commit_bools_write(struct file *filep, |
| 828 | const char __user *buf, |
| 829 | size_t count, loff_t *ppos) |
| 830 | { |
| 831 | char *page = NULL; |
| 832 | ssize_t length = -EFAULT; |
| 833 | int new_value; |
| 834 | |
Ingo Molnar | bb00307 | 2006-03-22 00:09:14 -0800 | [diff] [blame^] | 835 | mutex_lock(&sel_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 836 | |
| 837 | length = task_has_security(current, SECURITY__SETBOOL); |
| 838 | if (length) |
| 839 | goto out; |
| 840 | |
| 841 | /* check to see if this file has been deleted */ |
| 842 | if (!filep->f_op) |
| 843 | goto out; |
| 844 | |
Davi Arnaut | bfd5162 | 2005-10-30 14:59:24 -0800 | [diff] [blame] | 845 | if (count >= PAGE_SIZE) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 846 | length = -ENOMEM; |
| 847 | goto out; |
| 848 | } |
| 849 | if (*ppos != 0) { |
| 850 | /* No partial writes. */ |
| 851 | goto out; |
| 852 | } |
| 853 | page = (char*)get_zeroed_page(GFP_KERNEL); |
| 854 | if (!page) { |
| 855 | length = -ENOMEM; |
| 856 | goto out; |
| 857 | } |
| 858 | |
| 859 | if (copy_from_user(page, buf, count)) |
| 860 | goto out; |
| 861 | |
| 862 | length = -EINVAL; |
| 863 | if (sscanf(page, "%d", &new_value) != 1) |
| 864 | goto out; |
| 865 | |
Davi Arnaut | 20c19e4 | 2005-10-23 12:57:16 -0700 | [diff] [blame] | 866 | if (new_value && bool_pending_values) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 867 | security_set_bools(bool_num, bool_pending_values); |
| 868 | } |
| 869 | |
| 870 | length = count; |
| 871 | |
| 872 | out: |
Ingo Molnar | bb00307 | 2006-03-22 00:09:14 -0800 | [diff] [blame^] | 873 | mutex_unlock(&sel_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 874 | if (page) |
| 875 | free_page((unsigned long) page); |
| 876 | return length; |
| 877 | } |
| 878 | |
| 879 | static struct file_operations sel_commit_bools_ops = { |
| 880 | .write = sel_commit_bools_write, |
| 881 | }; |
| 882 | |
| 883 | /* delete booleans - partial revoke() from |
| 884 | * fs/proc/generic.c proc_kill_inodes */ |
| 885 | static void sel_remove_bools(struct dentry *de) |
| 886 | { |
| 887 | struct list_head *p, *node; |
| 888 | struct super_block *sb = de->d_sb; |
| 889 | |
| 890 | spin_lock(&dcache_lock); |
| 891 | node = de->d_subdirs.next; |
| 892 | while (node != &de->d_subdirs) { |
Eric Dumazet | 5160ee6 | 2006-01-08 01:03:32 -0800 | [diff] [blame] | 893 | struct dentry *d = list_entry(node, struct dentry, d_u.d_child); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 894 | list_del_init(node); |
| 895 | |
| 896 | if (d->d_inode) { |
| 897 | d = dget_locked(d); |
| 898 | spin_unlock(&dcache_lock); |
| 899 | d_delete(d); |
| 900 | simple_unlink(de->d_inode, d); |
| 901 | dput(d); |
| 902 | spin_lock(&dcache_lock); |
| 903 | } |
| 904 | node = de->d_subdirs.next; |
| 905 | } |
| 906 | |
| 907 | spin_unlock(&dcache_lock); |
| 908 | |
| 909 | file_list_lock(); |
| 910 | list_for_each(p, &sb->s_files) { |
Eric Dumazet | 2f51201 | 2005-10-30 15:02:16 -0800 | [diff] [blame] | 911 | struct file * filp = list_entry(p, struct file, f_u.fu_list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 912 | struct dentry * dentry = filp->f_dentry; |
| 913 | |
| 914 | if (dentry->d_parent != de) { |
| 915 | continue; |
| 916 | } |
| 917 | filp->f_op = NULL; |
| 918 | } |
| 919 | file_list_unlock(); |
| 920 | } |
| 921 | |
| 922 | #define BOOL_DIR_NAME "booleans" |
| 923 | |
| 924 | static int sel_make_bools(void) |
| 925 | { |
| 926 | int i, ret = 0; |
| 927 | ssize_t len; |
| 928 | struct dentry *dentry = NULL; |
| 929 | struct dentry *dir = bool_dir; |
| 930 | struct inode *inode = NULL; |
| 931 | struct inode_security_struct *isec; |
| 932 | char **names = NULL, *page; |
| 933 | int num; |
| 934 | int *values = NULL; |
| 935 | u32 sid; |
| 936 | |
| 937 | /* remove any existing files */ |
Jesper Juhl | 9a5f04b | 2005-06-25 14:58:51 -0700 | [diff] [blame] | 938 | kfree(bool_pending_values); |
Davi Arnaut | 20c19e4 | 2005-10-23 12:57:16 -0700 | [diff] [blame] | 939 | bool_pending_values = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 940 | |
| 941 | sel_remove_bools(dir); |
| 942 | |
| 943 | if (!(page = (char*)get_zeroed_page(GFP_KERNEL))) |
| 944 | return -ENOMEM; |
| 945 | |
| 946 | ret = security_get_bools(&num, &names, &values); |
| 947 | if (ret != 0) |
| 948 | goto out; |
| 949 | |
| 950 | for (i = 0; i < num; i++) { |
| 951 | dentry = d_alloc_name(dir, names[i]); |
| 952 | if (!dentry) { |
| 953 | ret = -ENOMEM; |
| 954 | goto err; |
| 955 | } |
| 956 | inode = sel_make_inode(dir->d_sb, S_IFREG | S_IRUGO | S_IWUSR); |
| 957 | if (!inode) { |
| 958 | ret = -ENOMEM; |
| 959 | goto err; |
| 960 | } |
| 961 | |
| 962 | len = snprintf(page, PAGE_SIZE, "/%s/%s", BOOL_DIR_NAME, names[i]); |
| 963 | if (len < 0) { |
| 964 | ret = -EINVAL; |
| 965 | goto err; |
| 966 | } else if (len >= PAGE_SIZE) { |
| 967 | ret = -ENAMETOOLONG; |
| 968 | goto err; |
| 969 | } |
| 970 | isec = (struct inode_security_struct*)inode->i_security; |
| 971 | if ((ret = security_genfs_sid("selinuxfs", page, SECCLASS_FILE, &sid))) |
| 972 | goto err; |
| 973 | isec->sid = sid; |
| 974 | isec->initialized = 1; |
| 975 | inode->i_fop = &sel_bool_ops; |
| 976 | inode->i_ino = i + BOOL_INO_OFFSET; |
| 977 | d_add(dentry, inode); |
| 978 | } |
| 979 | bool_num = num; |
| 980 | bool_pending_values = values; |
| 981 | out: |
| 982 | free_page((unsigned long)page); |
| 983 | if (names) { |
Jesper Juhl | 9a5f04b | 2005-06-25 14:58:51 -0700 | [diff] [blame] | 984 | for (i = 0; i < num; i++) |
| 985 | kfree(names[i]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 986 | kfree(names); |
| 987 | } |
| 988 | return ret; |
| 989 | err: |
Davi Arnaut | 20c19e4 | 2005-10-23 12:57:16 -0700 | [diff] [blame] | 990 | kfree(values); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 991 | d_genocide(dir); |
| 992 | ret = -ENOMEM; |
| 993 | goto out; |
| 994 | } |
| 995 | |
| 996 | #define NULL_FILE_NAME "null" |
| 997 | |
| 998 | struct dentry *selinux_null = NULL; |
| 999 | |
| 1000 | static ssize_t sel_read_avc_cache_threshold(struct file *filp, char __user *buf, |
| 1001 | size_t count, loff_t *ppos) |
| 1002 | { |
| 1003 | char tmpbuf[TMPBUFLEN]; |
| 1004 | ssize_t length; |
| 1005 | |
| 1006 | length = scnprintf(tmpbuf, TMPBUFLEN, "%u", avc_cache_threshold); |
| 1007 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); |
| 1008 | } |
| 1009 | |
| 1010 | static ssize_t sel_write_avc_cache_threshold(struct file * file, |
| 1011 | const char __user * buf, |
| 1012 | size_t count, loff_t *ppos) |
| 1013 | |
| 1014 | { |
| 1015 | char *page; |
| 1016 | ssize_t ret; |
| 1017 | int new_value; |
| 1018 | |
Davi Arnaut | bfd5162 | 2005-10-30 14:59:24 -0800 | [diff] [blame] | 1019 | if (count >= PAGE_SIZE) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1020 | ret = -ENOMEM; |
| 1021 | goto out; |
| 1022 | } |
| 1023 | |
| 1024 | if (*ppos != 0) { |
| 1025 | /* No partial writes. */ |
| 1026 | ret = -EINVAL; |
| 1027 | goto out; |
| 1028 | } |
| 1029 | |
| 1030 | page = (char*)get_zeroed_page(GFP_KERNEL); |
| 1031 | if (!page) { |
| 1032 | ret = -ENOMEM; |
| 1033 | goto out; |
| 1034 | } |
| 1035 | |
| 1036 | if (copy_from_user(page, buf, count)) { |
| 1037 | ret = -EFAULT; |
| 1038 | goto out_free; |
| 1039 | } |
| 1040 | |
| 1041 | if (sscanf(page, "%u", &new_value) != 1) { |
| 1042 | ret = -EINVAL; |
| 1043 | goto out; |
| 1044 | } |
| 1045 | |
| 1046 | if (new_value != avc_cache_threshold) { |
| 1047 | ret = task_has_security(current, SECURITY__SETSECPARAM); |
| 1048 | if (ret) |
| 1049 | goto out_free; |
| 1050 | avc_cache_threshold = new_value; |
| 1051 | } |
| 1052 | ret = count; |
| 1053 | out_free: |
| 1054 | free_page((unsigned long)page); |
| 1055 | out: |
| 1056 | return ret; |
| 1057 | } |
| 1058 | |
| 1059 | static ssize_t sel_read_avc_hash_stats(struct file *filp, char __user *buf, |
| 1060 | size_t count, loff_t *ppos) |
| 1061 | { |
| 1062 | char *page; |
| 1063 | ssize_t ret = 0; |
| 1064 | |
| 1065 | page = (char *)__get_free_page(GFP_KERNEL); |
| 1066 | if (!page) { |
| 1067 | ret = -ENOMEM; |
| 1068 | goto out; |
| 1069 | } |
| 1070 | ret = avc_get_hash_stats(page); |
| 1071 | if (ret >= 0) |
| 1072 | ret = simple_read_from_buffer(buf, count, ppos, page, ret); |
| 1073 | free_page((unsigned long)page); |
| 1074 | out: |
| 1075 | return ret; |
| 1076 | } |
| 1077 | |
| 1078 | static struct file_operations sel_avc_cache_threshold_ops = { |
| 1079 | .read = sel_read_avc_cache_threshold, |
| 1080 | .write = sel_write_avc_cache_threshold, |
| 1081 | }; |
| 1082 | |
| 1083 | static struct file_operations sel_avc_hash_stats_ops = { |
| 1084 | .read = sel_read_avc_hash_stats, |
| 1085 | }; |
| 1086 | |
| 1087 | #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS |
| 1088 | static struct avc_cache_stats *sel_avc_get_stat_idx(loff_t *idx) |
| 1089 | { |
| 1090 | int cpu; |
| 1091 | |
| 1092 | for (cpu = *idx; cpu < NR_CPUS; ++cpu) { |
| 1093 | if (!cpu_possible(cpu)) |
| 1094 | continue; |
| 1095 | *idx = cpu + 1; |
| 1096 | return &per_cpu(avc_cache_stats, cpu); |
| 1097 | } |
| 1098 | return NULL; |
| 1099 | } |
| 1100 | |
| 1101 | static void *sel_avc_stats_seq_start(struct seq_file *seq, loff_t *pos) |
| 1102 | { |
| 1103 | loff_t n = *pos - 1; |
| 1104 | |
| 1105 | if (*pos == 0) |
| 1106 | return SEQ_START_TOKEN; |
| 1107 | |
| 1108 | return sel_avc_get_stat_idx(&n); |
| 1109 | } |
| 1110 | |
| 1111 | static void *sel_avc_stats_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
| 1112 | { |
| 1113 | return sel_avc_get_stat_idx(pos); |
| 1114 | } |
| 1115 | |
| 1116 | static int sel_avc_stats_seq_show(struct seq_file *seq, void *v) |
| 1117 | { |
| 1118 | struct avc_cache_stats *st = v; |
| 1119 | |
| 1120 | if (v == SEQ_START_TOKEN) |
| 1121 | seq_printf(seq, "lookups hits misses allocations reclaims " |
| 1122 | "frees\n"); |
| 1123 | else |
| 1124 | seq_printf(seq, "%u %u %u %u %u %u\n", st->lookups, |
| 1125 | st->hits, st->misses, st->allocations, |
| 1126 | st->reclaims, st->frees); |
| 1127 | return 0; |
| 1128 | } |
| 1129 | |
| 1130 | static void sel_avc_stats_seq_stop(struct seq_file *seq, void *v) |
| 1131 | { } |
| 1132 | |
| 1133 | static struct seq_operations sel_avc_cache_stats_seq_ops = { |
| 1134 | .start = sel_avc_stats_seq_start, |
| 1135 | .next = sel_avc_stats_seq_next, |
| 1136 | .show = sel_avc_stats_seq_show, |
| 1137 | .stop = sel_avc_stats_seq_stop, |
| 1138 | }; |
| 1139 | |
| 1140 | static int sel_open_avc_cache_stats(struct inode *inode, struct file *file) |
| 1141 | { |
| 1142 | return seq_open(file, &sel_avc_cache_stats_seq_ops); |
| 1143 | } |
| 1144 | |
| 1145 | static struct file_operations sel_avc_cache_stats_ops = { |
| 1146 | .open = sel_open_avc_cache_stats, |
| 1147 | .read = seq_read, |
| 1148 | .llseek = seq_lseek, |
| 1149 | .release = seq_release, |
| 1150 | }; |
| 1151 | #endif |
| 1152 | |
| 1153 | static int sel_make_avc_files(struct dentry *dir) |
| 1154 | { |
| 1155 | int i, ret = 0; |
| 1156 | static struct tree_descr files[] = { |
| 1157 | { "cache_threshold", |
| 1158 | &sel_avc_cache_threshold_ops, S_IRUGO|S_IWUSR }, |
| 1159 | { "hash_stats", &sel_avc_hash_stats_ops, S_IRUGO }, |
| 1160 | #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS |
| 1161 | { "cache_stats", &sel_avc_cache_stats_ops, S_IRUGO }, |
| 1162 | #endif |
| 1163 | }; |
| 1164 | |
Nicolas Kaiser | 6e20a64 | 2006-01-06 00:11:22 -0800 | [diff] [blame] | 1165 | for (i = 0; i < ARRAY_SIZE(files); i++) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1166 | struct inode *inode; |
| 1167 | struct dentry *dentry; |
| 1168 | |
| 1169 | dentry = d_alloc_name(dir, files[i].name); |
| 1170 | if (!dentry) { |
| 1171 | ret = -ENOMEM; |
| 1172 | goto err; |
| 1173 | } |
| 1174 | |
| 1175 | inode = sel_make_inode(dir->d_sb, S_IFREG|files[i].mode); |
| 1176 | if (!inode) { |
| 1177 | ret = -ENOMEM; |
| 1178 | goto err; |
| 1179 | } |
| 1180 | inode->i_fop = files[i].ops; |
| 1181 | d_add(dentry, inode); |
| 1182 | } |
| 1183 | out: |
| 1184 | return ret; |
| 1185 | err: |
| 1186 | d_genocide(dir); |
| 1187 | goto out; |
| 1188 | } |
| 1189 | |
| 1190 | static int sel_make_dir(struct super_block *sb, struct dentry *dentry) |
| 1191 | { |
| 1192 | int ret = 0; |
| 1193 | struct inode *inode; |
| 1194 | |
| 1195 | inode = sel_make_inode(sb, S_IFDIR | S_IRUGO | S_IXUGO); |
| 1196 | if (!inode) { |
| 1197 | ret = -ENOMEM; |
| 1198 | goto out; |
| 1199 | } |
| 1200 | inode->i_op = &simple_dir_inode_operations; |
| 1201 | inode->i_fop = &simple_dir_operations; |
| 1202 | d_add(dentry, inode); |
| 1203 | out: |
| 1204 | return ret; |
| 1205 | } |
| 1206 | |
| 1207 | static int sel_fill_super(struct super_block * sb, void * data, int silent) |
| 1208 | { |
| 1209 | int ret; |
| 1210 | struct dentry *dentry; |
| 1211 | struct inode *inode; |
| 1212 | struct inode_security_struct *isec; |
| 1213 | |
| 1214 | static struct tree_descr selinux_files[] = { |
| 1215 | [SEL_LOAD] = {"load", &sel_load_ops, S_IRUSR|S_IWUSR}, |
| 1216 | [SEL_ENFORCE] = {"enforce", &sel_enforce_ops, S_IRUGO|S_IWUSR}, |
Stephen Smalley | ce9982d | 2005-11-08 21:34:33 -0800 | [diff] [blame] | 1217 | [SEL_CONTEXT] = {"context", &transaction_ops, S_IRUGO|S_IWUGO}, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1218 | [SEL_ACCESS] = {"access", &transaction_ops, S_IRUGO|S_IWUGO}, |
| 1219 | [SEL_CREATE] = {"create", &transaction_ops, S_IRUGO|S_IWUGO}, |
| 1220 | [SEL_RELABEL] = {"relabel", &transaction_ops, S_IRUGO|S_IWUGO}, |
| 1221 | [SEL_USER] = {"user", &transaction_ops, S_IRUGO|S_IWUGO}, |
| 1222 | [SEL_POLICYVERS] = {"policyvers", &sel_policyvers_ops, S_IRUGO}, |
| 1223 | [SEL_COMMIT_BOOLS] = {"commit_pending_bools", &sel_commit_bools_ops, S_IWUSR}, |
| 1224 | [SEL_MLS] = {"mls", &sel_mls_ops, S_IRUGO}, |
| 1225 | [SEL_DISABLE] = {"disable", &sel_disable_ops, S_IWUSR}, |
| 1226 | [SEL_MEMBER] = {"member", &transaction_ops, S_IRUGO|S_IWUGO}, |
| 1227 | [SEL_CHECKREQPROT] = {"checkreqprot", &sel_checkreqprot_ops, S_IRUGO|S_IWUSR}, |
| 1228 | /* last one */ {""} |
| 1229 | }; |
| 1230 | ret = simple_fill_super(sb, SELINUX_MAGIC, selinux_files); |
| 1231 | if (ret) |
| 1232 | return ret; |
| 1233 | |
| 1234 | dentry = d_alloc_name(sb->s_root, BOOL_DIR_NAME); |
| 1235 | if (!dentry) |
| 1236 | return -ENOMEM; |
| 1237 | |
| 1238 | inode = sel_make_inode(sb, S_IFDIR | S_IRUGO | S_IXUGO); |
| 1239 | if (!inode) |
| 1240 | goto out; |
| 1241 | inode->i_op = &simple_dir_inode_operations; |
| 1242 | inode->i_fop = &simple_dir_operations; |
| 1243 | d_add(dentry, inode); |
| 1244 | bool_dir = dentry; |
| 1245 | ret = sel_make_bools(); |
| 1246 | if (ret) |
| 1247 | goto out; |
| 1248 | |
| 1249 | dentry = d_alloc_name(sb->s_root, NULL_FILE_NAME); |
| 1250 | if (!dentry) |
| 1251 | return -ENOMEM; |
| 1252 | |
| 1253 | inode = sel_make_inode(sb, S_IFCHR | S_IRUGO | S_IWUGO); |
| 1254 | if (!inode) |
| 1255 | goto out; |
| 1256 | isec = (struct inode_security_struct*)inode->i_security; |
| 1257 | isec->sid = SECINITSID_DEVNULL; |
| 1258 | isec->sclass = SECCLASS_CHR_FILE; |
| 1259 | isec->initialized = 1; |
| 1260 | |
| 1261 | init_special_inode(inode, S_IFCHR | S_IRUGO | S_IWUGO, MKDEV(MEM_MAJOR, 3)); |
| 1262 | d_add(dentry, inode); |
| 1263 | selinux_null = dentry; |
| 1264 | |
| 1265 | dentry = d_alloc_name(sb->s_root, "avc"); |
| 1266 | if (!dentry) |
| 1267 | return -ENOMEM; |
| 1268 | |
| 1269 | ret = sel_make_dir(sb, dentry); |
| 1270 | if (ret) |
| 1271 | goto out; |
| 1272 | |
| 1273 | ret = sel_make_avc_files(dentry); |
| 1274 | if (ret) |
| 1275 | goto out; |
| 1276 | |
| 1277 | return 0; |
| 1278 | out: |
| 1279 | dput(dentry); |
| 1280 | printk(KERN_ERR "%s: failed while creating inodes\n", __FUNCTION__); |
| 1281 | return -ENOMEM; |
| 1282 | } |
| 1283 | |
| 1284 | static struct super_block *sel_get_sb(struct file_system_type *fs_type, |
| 1285 | int flags, const char *dev_name, void *data) |
| 1286 | { |
| 1287 | return get_sb_single(fs_type, flags, data, sel_fill_super); |
| 1288 | } |
| 1289 | |
| 1290 | static struct file_system_type sel_fs_type = { |
| 1291 | .name = "selinuxfs", |
| 1292 | .get_sb = sel_get_sb, |
| 1293 | .kill_sb = kill_litter_super, |
| 1294 | }; |
| 1295 | |
| 1296 | struct vfsmount *selinuxfs_mount; |
| 1297 | |
| 1298 | static int __init init_sel_fs(void) |
| 1299 | { |
| 1300 | int err; |
| 1301 | |
| 1302 | if (!selinux_enabled) |
| 1303 | return 0; |
| 1304 | err = register_filesystem(&sel_fs_type); |
| 1305 | if (!err) { |
| 1306 | selinuxfs_mount = kern_mount(&sel_fs_type); |
| 1307 | if (IS_ERR(selinuxfs_mount)) { |
| 1308 | printk(KERN_ERR "selinuxfs: could not mount!\n"); |
| 1309 | err = PTR_ERR(selinuxfs_mount); |
| 1310 | selinuxfs_mount = NULL; |
| 1311 | } |
| 1312 | } |
| 1313 | return err; |
| 1314 | } |
| 1315 | |
| 1316 | __initcall(init_sel_fs); |
| 1317 | |
| 1318 | #ifdef CONFIG_SECURITY_SELINUX_DISABLE |
| 1319 | void exit_sel_fs(void) |
| 1320 | { |
| 1321 | unregister_filesystem(&sel_fs_type); |
| 1322 | } |
| 1323 | #endif |