compat.c 56 KB

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  1. /*
  2. * linux/fs/compat.c
  3. *
  4. * Kernel compatibililty routines for e.g. 32 bit syscall support
  5. * on 64 bit kernels.
  6. *
  7. * Copyright (C) 2002 Stephen Rothwell, IBM Corporation
  8. * Copyright (C) 1997-2000 Jakub Jelinek (jakub@redhat.com)
  9. * Copyright (C) 1998 Eddie C. Dost (ecd@skynet.be)
  10. * Copyright (C) 2001,2002 Andi Kleen, SuSE Labs
  11. * Copyright (C) 2003 Pavel Machek (pavel@suse.cz)
  12. *
  13. * This program is free software; you can redistribute it and/or modify
  14. * it under the terms of the GNU General Public License version 2 as
  15. * published by the Free Software Foundation.
  16. */
  17. #include <linux/linkage.h>
  18. #include <linux/compat.h>
  19. #include <linux/errno.h>
  20. #include <linux/time.h>
  21. #include <linux/fs.h>
  22. #include <linux/fcntl.h>
  23. #include <linux/namei.h>
  24. #include <linux/file.h>
  25. #include <linux/vfs.h>
  26. #include <linux/ioctl32.h>
  27. #include <linux/ioctl.h>
  28. #include <linux/init.h>
  29. #include <linux/sockios.h> /* for SIOCDEVPRIVATE */
  30. #include <linux/smb.h>
  31. #include <linux/smb_mount.h>
  32. #include <linux/ncp_mount.h>
  33. #include <linux/nfs4_mount.h>
  34. #include <linux/smp_lock.h>
  35. #include <linux/syscalls.h>
  36. #include <linux/ctype.h>
  37. #include <linux/module.h>
  38. #include <linux/dirent.h>
  39. #include <linux/fsnotify.h>
  40. #include <linux/highuid.h>
  41. #include <linux/sunrpc/svc.h>
  42. #include <linux/nfsd/nfsd.h>
  43. #include <linux/nfsd/syscall.h>
  44. #include <linux/personality.h>
  45. #include <linux/rwsem.h>
  46. #include <linux/tsacct_kern.h>
  47. #include <linux/highmem.h>
  48. #include <linux/poll.h>
  49. #include <linux/mm.h>
  50. #include <linux/eventpoll.h>
  51. #include <net/sock.h> /* siocdevprivate_ioctl */
  52. #include <asm/uaccess.h>
  53. #include <asm/mmu_context.h>
  54. #include <asm/ioctls.h>
  55. #include "internal.h"
  56. int compat_log = 1;
  57. int compat_printk(const char *fmt, ...)
  58. {
  59. va_list ap;
  60. int ret;
  61. if (!compat_log)
  62. return 0;
  63. va_start(ap, fmt);
  64. ret = vprintk(fmt, ap);
  65. va_end(ap);
  66. return ret;
  67. }
  68. #include "read_write.h"
  69. /*
  70. * Not all architectures have sys_utime, so implement this in terms
  71. * of sys_utimes.
  72. */
  73. asmlinkage long compat_sys_utime(char __user *filename, struct compat_utimbuf __user *t)
  74. {
  75. struct timeval tv[2];
  76. if (t) {
  77. if (get_user(tv[0].tv_sec, &t->actime) ||
  78. get_user(tv[1].tv_sec, &t->modtime))
  79. return -EFAULT;
  80. tv[0].tv_usec = 0;
  81. tv[1].tv_usec = 0;
  82. }
  83. return do_utimes(AT_FDCWD, filename, t ? tv : NULL);
  84. }
  85. asmlinkage long compat_sys_futimesat(unsigned int dfd, char __user *filename, struct compat_timeval __user *t)
  86. {
  87. struct timeval tv[2];
  88. if (t) {
  89. if (get_user(tv[0].tv_sec, &t[0].tv_sec) ||
  90. get_user(tv[0].tv_usec, &t[0].tv_usec) ||
  91. get_user(tv[1].tv_sec, &t[1].tv_sec) ||
  92. get_user(tv[1].tv_usec, &t[1].tv_usec))
  93. return -EFAULT;
  94. }
  95. return do_utimes(dfd, filename, t ? tv : NULL);
  96. }
  97. asmlinkage long compat_sys_utimes(char __user *filename, struct compat_timeval __user *t)
  98. {
  99. return compat_sys_futimesat(AT_FDCWD, filename, t);
  100. }
  101. asmlinkage long compat_sys_newstat(char __user * filename,
  102. struct compat_stat __user *statbuf)
  103. {
  104. struct kstat stat;
  105. int error = vfs_stat_fd(AT_FDCWD, filename, &stat);
  106. if (!error)
  107. error = cp_compat_stat(&stat, statbuf);
  108. return error;
  109. }
  110. asmlinkage long compat_sys_newlstat(char __user * filename,
  111. struct compat_stat __user *statbuf)
  112. {
  113. struct kstat stat;
  114. int error = vfs_lstat_fd(AT_FDCWD, filename, &stat);
  115. if (!error)
  116. error = cp_compat_stat(&stat, statbuf);
  117. return error;
  118. }
  119. #ifndef __ARCH_WANT_STAT64
  120. asmlinkage long compat_sys_newfstatat(unsigned int dfd, char __user *filename,
  121. struct compat_stat __user *statbuf, int flag)
  122. {
  123. struct kstat stat;
  124. int error = -EINVAL;
  125. if ((flag & ~AT_SYMLINK_NOFOLLOW) != 0)
  126. goto out;
  127. if (flag & AT_SYMLINK_NOFOLLOW)
  128. error = vfs_lstat_fd(dfd, filename, &stat);
  129. else
  130. error = vfs_stat_fd(dfd, filename, &stat);
  131. if (!error)
  132. error = cp_compat_stat(&stat, statbuf);
  133. out:
  134. return error;
  135. }
  136. #endif
  137. asmlinkage long compat_sys_newfstat(unsigned int fd,
  138. struct compat_stat __user * statbuf)
  139. {
  140. struct kstat stat;
  141. int error = vfs_fstat(fd, &stat);
  142. if (!error)
  143. error = cp_compat_stat(&stat, statbuf);
  144. return error;
  145. }
  146. static int put_compat_statfs(struct compat_statfs __user *ubuf, struct kstatfs *kbuf)
  147. {
  148. if (sizeof ubuf->f_blocks == 4) {
  149. if ((kbuf->f_blocks | kbuf->f_bfree | kbuf->f_bavail) &
  150. 0xffffffff00000000ULL)
  151. return -EOVERFLOW;
  152. /* f_files and f_ffree may be -1; it's okay
  153. * to stuff that into 32 bits */
  154. if (kbuf->f_files != 0xffffffffffffffffULL
  155. && (kbuf->f_files & 0xffffffff00000000ULL))
  156. return -EOVERFLOW;
  157. if (kbuf->f_ffree != 0xffffffffffffffffULL
  158. && (kbuf->f_ffree & 0xffffffff00000000ULL))
  159. return -EOVERFLOW;
  160. }
  161. if (!access_ok(VERIFY_WRITE, ubuf, sizeof(*ubuf)) ||
  162. __put_user(kbuf->f_type, &ubuf->f_type) ||
  163. __put_user(kbuf->f_bsize, &ubuf->f_bsize) ||
  164. __put_user(kbuf->f_blocks, &ubuf->f_blocks) ||
  165. __put_user(kbuf->f_bfree, &ubuf->f_bfree) ||
  166. __put_user(kbuf->f_bavail, &ubuf->f_bavail) ||
  167. __put_user(kbuf->f_files, &ubuf->f_files) ||
  168. __put_user(kbuf->f_ffree, &ubuf->f_ffree) ||
  169. __put_user(kbuf->f_namelen, &ubuf->f_namelen) ||
  170. __put_user(kbuf->f_fsid.val[0], &ubuf->f_fsid.val[0]) ||
  171. __put_user(kbuf->f_fsid.val[1], &ubuf->f_fsid.val[1]) ||
  172. __put_user(kbuf->f_frsize, &ubuf->f_frsize) ||
  173. __put_user(0, &ubuf->f_spare[0]) ||
  174. __put_user(0, &ubuf->f_spare[1]) ||
  175. __put_user(0, &ubuf->f_spare[2]) ||
  176. __put_user(0, &ubuf->f_spare[3]) ||
  177. __put_user(0, &ubuf->f_spare[4]))
  178. return -EFAULT;
  179. return 0;
  180. }
  181. /*
  182. * The following statfs calls are copies of code from fs/open.c and
  183. * should be checked against those from time to time
  184. */
  185. asmlinkage long compat_sys_statfs(const char __user *path, struct compat_statfs __user *buf)
  186. {
  187. struct nameidata nd;
  188. int error;
  189. error = user_path_walk(path, &nd);
  190. if (!error) {
  191. struct kstatfs tmp;
  192. error = vfs_statfs(nd.dentry, &tmp);
  193. if (!error)
  194. error = put_compat_statfs(buf, &tmp);
  195. path_release(&nd);
  196. }
  197. return error;
  198. }
  199. asmlinkage long compat_sys_fstatfs(unsigned int fd, struct compat_statfs __user *buf)
  200. {
  201. struct file * file;
  202. struct kstatfs tmp;
  203. int error;
  204. error = -EBADF;
  205. file = fget(fd);
  206. if (!file)
  207. goto out;
  208. error = vfs_statfs(file->f_path.dentry, &tmp);
  209. if (!error)
  210. error = put_compat_statfs(buf, &tmp);
  211. fput(file);
  212. out:
  213. return error;
  214. }
  215. static int put_compat_statfs64(struct compat_statfs64 __user *ubuf, struct kstatfs *kbuf)
  216. {
  217. if (sizeof ubuf->f_blocks == 4) {
  218. if ((kbuf->f_blocks | kbuf->f_bfree | kbuf->f_bavail) &
  219. 0xffffffff00000000ULL)
  220. return -EOVERFLOW;
  221. /* f_files and f_ffree may be -1; it's okay
  222. * to stuff that into 32 bits */
  223. if (kbuf->f_files != 0xffffffffffffffffULL
  224. && (kbuf->f_files & 0xffffffff00000000ULL))
  225. return -EOVERFLOW;
  226. if (kbuf->f_ffree != 0xffffffffffffffffULL
  227. && (kbuf->f_ffree & 0xffffffff00000000ULL))
  228. return -EOVERFLOW;
  229. }
  230. if (!access_ok(VERIFY_WRITE, ubuf, sizeof(*ubuf)) ||
  231. __put_user(kbuf->f_type, &ubuf->f_type) ||
  232. __put_user(kbuf->f_bsize, &ubuf->f_bsize) ||
  233. __put_user(kbuf->f_blocks, &ubuf->f_blocks) ||
  234. __put_user(kbuf->f_bfree, &ubuf->f_bfree) ||
  235. __put_user(kbuf->f_bavail, &ubuf->f_bavail) ||
  236. __put_user(kbuf->f_files, &ubuf->f_files) ||
  237. __put_user(kbuf->f_ffree, &ubuf->f_ffree) ||
  238. __put_user(kbuf->f_namelen, &ubuf->f_namelen) ||
  239. __put_user(kbuf->f_fsid.val[0], &ubuf->f_fsid.val[0]) ||
  240. __put_user(kbuf->f_fsid.val[1], &ubuf->f_fsid.val[1]) ||
  241. __put_user(kbuf->f_frsize, &ubuf->f_frsize))
  242. return -EFAULT;
  243. return 0;
  244. }
  245. asmlinkage long compat_sys_statfs64(const char __user *path, compat_size_t sz, struct compat_statfs64 __user *buf)
  246. {
  247. struct nameidata nd;
  248. int error;
  249. if (sz != sizeof(*buf))
  250. return -EINVAL;
  251. error = user_path_walk(path, &nd);
  252. if (!error) {
  253. struct kstatfs tmp;
  254. error = vfs_statfs(nd.dentry, &tmp);
  255. if (!error)
  256. error = put_compat_statfs64(buf, &tmp);
  257. path_release(&nd);
  258. }
  259. return error;
  260. }
  261. asmlinkage long compat_sys_fstatfs64(unsigned int fd, compat_size_t sz, struct compat_statfs64 __user *buf)
  262. {
  263. struct file * file;
  264. struct kstatfs tmp;
  265. int error;
  266. if (sz != sizeof(*buf))
  267. return -EINVAL;
  268. error = -EBADF;
  269. file = fget(fd);
  270. if (!file)
  271. goto out;
  272. error = vfs_statfs(file->f_path.dentry, &tmp);
  273. if (!error)
  274. error = put_compat_statfs64(buf, &tmp);
  275. fput(file);
  276. out:
  277. return error;
  278. }
  279. /* ioctl32 stuff, used by sparc64, parisc, s390x, ppc64, x86_64, MIPS */
  280. #define IOCTL_HASHSIZE 256
  281. static struct ioctl_trans *ioctl32_hash_table[IOCTL_HASHSIZE];
  282. static inline unsigned long ioctl32_hash(unsigned long cmd)
  283. {
  284. return (((cmd >> 6) ^ (cmd >> 4) ^ cmd)) % IOCTL_HASHSIZE;
  285. }
  286. static void ioctl32_insert_translation(struct ioctl_trans *trans)
  287. {
  288. unsigned long hash;
  289. struct ioctl_trans *t;
  290. hash = ioctl32_hash (trans->cmd);
  291. if (!ioctl32_hash_table[hash])
  292. ioctl32_hash_table[hash] = trans;
  293. else {
  294. t = ioctl32_hash_table[hash];
  295. while (t->next)
  296. t = t->next;
  297. trans->next = NULL;
  298. t->next = trans;
  299. }
  300. }
  301. static int __init init_sys32_ioctl(void)
  302. {
  303. int i;
  304. for (i = 0; i < ioctl_table_size; i++) {
  305. if (ioctl_start[i].next != 0) {
  306. printk("ioctl translation %d bad\n",i);
  307. return -1;
  308. }
  309. ioctl32_insert_translation(&ioctl_start[i]);
  310. }
  311. return 0;
  312. }
  313. __initcall(init_sys32_ioctl);
  314. static void compat_ioctl_error(struct file *filp, unsigned int fd,
  315. unsigned int cmd, unsigned long arg)
  316. {
  317. char buf[10];
  318. char *fn = "?";
  319. char *path;
  320. /* find the name of the device. */
  321. path = (char *)__get_free_page(GFP_KERNEL);
  322. if (path) {
  323. fn = d_path(filp->f_path.dentry, filp->f_path.mnt, path, PAGE_SIZE);
  324. if (IS_ERR(fn))
  325. fn = "?";
  326. }
  327. sprintf(buf,"'%c'", (cmd>>24) & 0x3f);
  328. if (!isprint(buf[1]))
  329. sprintf(buf, "%02x", buf[1]);
  330. compat_printk("ioctl32(%s:%d): Unknown cmd fd(%d) "
  331. "cmd(%08x){%s} arg(%08x) on %s\n",
  332. current->comm, current->pid,
  333. (int)fd, (unsigned int)cmd, buf,
  334. (unsigned int)arg, fn);
  335. if (path)
  336. free_page((unsigned long)path);
  337. }
  338. asmlinkage long compat_sys_ioctl(unsigned int fd, unsigned int cmd,
  339. unsigned long arg)
  340. {
  341. struct file *filp;
  342. int error = -EBADF;
  343. struct ioctl_trans *t;
  344. int fput_needed;
  345. filp = fget_light(fd, &fput_needed);
  346. if (!filp)
  347. goto out;
  348. /* RED-PEN how should LSM module know it's handling 32bit? */
  349. error = security_file_ioctl(filp, cmd, arg);
  350. if (error)
  351. goto out_fput;
  352. /*
  353. * To allow the compat_ioctl handlers to be self contained
  354. * we need to check the common ioctls here first.
  355. * Just handle them with the standard handlers below.
  356. */
  357. switch (cmd) {
  358. case FIOCLEX:
  359. case FIONCLEX:
  360. case FIONBIO:
  361. case FIOASYNC:
  362. case FIOQSIZE:
  363. break;
  364. case FIBMAP:
  365. case FIGETBSZ:
  366. case FIONREAD:
  367. if (S_ISREG(filp->f_path.dentry->d_inode->i_mode))
  368. break;
  369. /*FALL THROUGH*/
  370. default:
  371. if (filp->f_op && filp->f_op->compat_ioctl) {
  372. error = filp->f_op->compat_ioctl(filp, cmd, arg);
  373. if (error != -ENOIOCTLCMD)
  374. goto out_fput;
  375. }
  376. if (!filp->f_op ||
  377. (!filp->f_op->ioctl && !filp->f_op->unlocked_ioctl))
  378. goto do_ioctl;
  379. break;
  380. }
  381. for (t = ioctl32_hash_table[ioctl32_hash(cmd)]; t; t = t->next) {
  382. if (t->cmd == cmd)
  383. goto found_handler;
  384. }
  385. if (S_ISSOCK(filp->f_path.dentry->d_inode->i_mode) &&
  386. cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15)) {
  387. error = siocdevprivate_ioctl(fd, cmd, arg);
  388. } else {
  389. static int count;
  390. if (++count <= 50)
  391. compat_ioctl_error(filp, fd, cmd, arg);
  392. error = -EINVAL;
  393. }
  394. goto out_fput;
  395. found_handler:
  396. if (t->handler) {
  397. lock_kernel();
  398. error = t->handler(fd, cmd, arg, filp);
  399. unlock_kernel();
  400. goto out_fput;
  401. }
  402. do_ioctl:
  403. error = vfs_ioctl(filp, fd, cmd, arg);
  404. out_fput:
  405. fput_light(filp, fput_needed);
  406. out:
  407. return error;
  408. }
  409. static int get_compat_flock(struct flock *kfl, struct compat_flock __user *ufl)
  410. {
  411. if (!access_ok(VERIFY_READ, ufl, sizeof(*ufl)) ||
  412. __get_user(kfl->l_type, &ufl->l_type) ||
  413. __get_user(kfl->l_whence, &ufl->l_whence) ||
  414. __get_user(kfl->l_start, &ufl->l_start) ||
  415. __get_user(kfl->l_len, &ufl->l_len) ||
  416. __get_user(kfl->l_pid, &ufl->l_pid))
  417. return -EFAULT;
  418. return 0;
  419. }
  420. static int put_compat_flock(struct flock *kfl, struct compat_flock __user *ufl)
  421. {
  422. if (!access_ok(VERIFY_WRITE, ufl, sizeof(*ufl)) ||
  423. __put_user(kfl->l_type, &ufl->l_type) ||
  424. __put_user(kfl->l_whence, &ufl->l_whence) ||
  425. __put_user(kfl->l_start, &ufl->l_start) ||
  426. __put_user(kfl->l_len, &ufl->l_len) ||
  427. __put_user(kfl->l_pid, &ufl->l_pid))
  428. return -EFAULT;
  429. return 0;
  430. }
  431. #ifndef HAVE_ARCH_GET_COMPAT_FLOCK64
  432. static int get_compat_flock64(struct flock *kfl, struct compat_flock64 __user *ufl)
  433. {
  434. if (!access_ok(VERIFY_READ, ufl, sizeof(*ufl)) ||
  435. __get_user(kfl->l_type, &ufl->l_type) ||
  436. __get_user(kfl->l_whence, &ufl->l_whence) ||
  437. __get_user(kfl->l_start, &ufl->l_start) ||
  438. __get_user(kfl->l_len, &ufl->l_len) ||
  439. __get_user(kfl->l_pid, &ufl->l_pid))
  440. return -EFAULT;
  441. return 0;
  442. }
  443. #endif
  444. #ifndef HAVE_ARCH_PUT_COMPAT_FLOCK64
  445. static int put_compat_flock64(struct flock *kfl, struct compat_flock64 __user *ufl)
  446. {
  447. if (!access_ok(VERIFY_WRITE, ufl, sizeof(*ufl)) ||
  448. __put_user(kfl->l_type, &ufl->l_type) ||
  449. __put_user(kfl->l_whence, &ufl->l_whence) ||
  450. __put_user(kfl->l_start, &ufl->l_start) ||
  451. __put_user(kfl->l_len, &ufl->l_len) ||
  452. __put_user(kfl->l_pid, &ufl->l_pid))
  453. return -EFAULT;
  454. return 0;
  455. }
  456. #endif
  457. asmlinkage long compat_sys_fcntl64(unsigned int fd, unsigned int cmd,
  458. unsigned long arg)
  459. {
  460. mm_segment_t old_fs;
  461. struct flock f;
  462. long ret;
  463. switch (cmd) {
  464. case F_GETLK:
  465. case F_SETLK:
  466. case F_SETLKW:
  467. ret = get_compat_flock(&f, compat_ptr(arg));
  468. if (ret != 0)
  469. break;
  470. old_fs = get_fs();
  471. set_fs(KERNEL_DS);
  472. ret = sys_fcntl(fd, cmd, (unsigned long)&f);
  473. set_fs(old_fs);
  474. if (cmd == F_GETLK && ret == 0) {
  475. /* GETLK was successfule and we need to return the data...
  476. * but it needs to fit in the compat structure.
  477. * l_start shouldn't be too big, unless the original
  478. * start + end is greater than COMPAT_OFF_T_MAX, in which
  479. * case the app was asking for trouble, so we return
  480. * -EOVERFLOW in that case.
  481. * l_len could be too big, in which case we just truncate it,
  482. * and only allow the app to see that part of the conflicting
  483. * lock that might make sense to it anyway
  484. */
  485. if (f.l_start > COMPAT_OFF_T_MAX)
  486. ret = -EOVERFLOW;
  487. if (f.l_len > COMPAT_OFF_T_MAX)
  488. f.l_len = COMPAT_OFF_T_MAX;
  489. if (ret == 0)
  490. ret = put_compat_flock(&f, compat_ptr(arg));
  491. }
  492. break;
  493. case F_GETLK64:
  494. case F_SETLK64:
  495. case F_SETLKW64:
  496. ret = get_compat_flock64(&f, compat_ptr(arg));
  497. if (ret != 0)
  498. break;
  499. old_fs = get_fs();
  500. set_fs(KERNEL_DS);
  501. ret = sys_fcntl(fd, (cmd == F_GETLK64) ? F_GETLK :
  502. ((cmd == F_SETLK64) ? F_SETLK : F_SETLKW),
  503. (unsigned long)&f);
  504. set_fs(old_fs);
  505. if (cmd == F_GETLK64 && ret == 0) {
  506. /* need to return lock information - see above for commentary */
  507. if (f.l_start > COMPAT_LOFF_T_MAX)
  508. ret = -EOVERFLOW;
  509. if (f.l_len > COMPAT_LOFF_T_MAX)
  510. f.l_len = COMPAT_LOFF_T_MAX;
  511. if (ret == 0)
  512. ret = put_compat_flock64(&f, compat_ptr(arg));
  513. }
  514. break;
  515. default:
  516. ret = sys_fcntl(fd, cmd, arg);
  517. break;
  518. }
  519. return ret;
  520. }
  521. asmlinkage long compat_sys_fcntl(unsigned int fd, unsigned int cmd,
  522. unsigned long arg)
  523. {
  524. if ((cmd == F_GETLK64) || (cmd == F_SETLK64) || (cmd == F_SETLKW64))
  525. return -EINVAL;
  526. return compat_sys_fcntl64(fd, cmd, arg);
  527. }
  528. asmlinkage long
  529. compat_sys_io_setup(unsigned nr_reqs, u32 __user *ctx32p)
  530. {
  531. long ret;
  532. aio_context_t ctx64;
  533. mm_segment_t oldfs = get_fs();
  534. if (unlikely(get_user(ctx64, ctx32p)))
  535. return -EFAULT;
  536. set_fs(KERNEL_DS);
  537. /* The __user pointer cast is valid because of the set_fs() */
  538. ret = sys_io_setup(nr_reqs, (aio_context_t __user *) &ctx64);
  539. set_fs(oldfs);
  540. /* truncating is ok because it's a user address */
  541. if (!ret)
  542. ret = put_user((u32) ctx64, ctx32p);
  543. return ret;
  544. }
  545. asmlinkage long
  546. compat_sys_io_getevents(aio_context_t ctx_id,
  547. unsigned long min_nr,
  548. unsigned long nr,
  549. struct io_event __user *events,
  550. struct compat_timespec __user *timeout)
  551. {
  552. long ret;
  553. struct timespec t;
  554. struct timespec __user *ut = NULL;
  555. ret = -EFAULT;
  556. if (unlikely(!access_ok(VERIFY_WRITE, events,
  557. nr * sizeof(struct io_event))))
  558. goto out;
  559. if (timeout) {
  560. if (get_compat_timespec(&t, timeout))
  561. goto out;
  562. ut = compat_alloc_user_space(sizeof(*ut));
  563. if (copy_to_user(ut, &t, sizeof(t)) )
  564. goto out;
  565. }
  566. ret = sys_io_getevents(ctx_id, min_nr, nr, events, ut);
  567. out:
  568. return ret;
  569. }
  570. static inline long
  571. copy_iocb(long nr, u32 __user *ptr32, struct iocb __user * __user *ptr64)
  572. {
  573. compat_uptr_t uptr;
  574. int i;
  575. for (i = 0; i < nr; ++i) {
  576. if (get_user(uptr, ptr32 + i))
  577. return -EFAULT;
  578. if (put_user(compat_ptr(uptr), ptr64 + i))
  579. return -EFAULT;
  580. }
  581. return 0;
  582. }
  583. #define MAX_AIO_SUBMITS (PAGE_SIZE/sizeof(struct iocb *))
  584. asmlinkage long
  585. compat_sys_io_submit(aio_context_t ctx_id, int nr, u32 __user *iocb)
  586. {
  587. struct iocb __user * __user *iocb64;
  588. long ret;
  589. if (unlikely(nr < 0))
  590. return -EINVAL;
  591. if (nr > MAX_AIO_SUBMITS)
  592. nr = MAX_AIO_SUBMITS;
  593. iocb64 = compat_alloc_user_space(nr * sizeof(*iocb64));
  594. ret = copy_iocb(nr, iocb, iocb64);
  595. if (!ret)
  596. ret = sys_io_submit(ctx_id, nr, iocb64);
  597. return ret;
  598. }
  599. struct compat_ncp_mount_data {
  600. compat_int_t version;
  601. compat_uint_t ncp_fd;
  602. __compat_uid_t mounted_uid;
  603. compat_pid_t wdog_pid;
  604. unsigned char mounted_vol[NCP_VOLNAME_LEN + 1];
  605. compat_uint_t time_out;
  606. compat_uint_t retry_count;
  607. compat_uint_t flags;
  608. __compat_uid_t uid;
  609. __compat_gid_t gid;
  610. compat_mode_t file_mode;
  611. compat_mode_t dir_mode;
  612. };
  613. struct compat_ncp_mount_data_v4 {
  614. compat_int_t version;
  615. compat_ulong_t flags;
  616. compat_ulong_t mounted_uid;
  617. compat_long_t wdog_pid;
  618. compat_uint_t ncp_fd;
  619. compat_uint_t time_out;
  620. compat_uint_t retry_count;
  621. compat_ulong_t uid;
  622. compat_ulong_t gid;
  623. compat_ulong_t file_mode;
  624. compat_ulong_t dir_mode;
  625. };
  626. static void *do_ncp_super_data_conv(void *raw_data)
  627. {
  628. int version = *(unsigned int *)raw_data;
  629. if (version == 3) {
  630. struct compat_ncp_mount_data *c_n = raw_data;
  631. struct ncp_mount_data *n = raw_data;
  632. n->dir_mode = c_n->dir_mode;
  633. n->file_mode = c_n->file_mode;
  634. n->gid = c_n->gid;
  635. n->uid = c_n->uid;
  636. memmove (n->mounted_vol, c_n->mounted_vol, (sizeof (c_n->mounted_vol) + 3 * sizeof (unsigned int)));
  637. n->wdog_pid = c_n->wdog_pid;
  638. n->mounted_uid = c_n->mounted_uid;
  639. } else if (version == 4) {
  640. struct compat_ncp_mount_data_v4 *c_n = raw_data;
  641. struct ncp_mount_data_v4 *n = raw_data;
  642. n->dir_mode = c_n->dir_mode;
  643. n->file_mode = c_n->file_mode;
  644. n->gid = c_n->gid;
  645. n->uid = c_n->uid;
  646. n->retry_count = c_n->retry_count;
  647. n->time_out = c_n->time_out;
  648. n->ncp_fd = c_n->ncp_fd;
  649. n->wdog_pid = c_n->wdog_pid;
  650. n->mounted_uid = c_n->mounted_uid;
  651. n->flags = c_n->flags;
  652. } else if (version != 5) {
  653. return NULL;
  654. }
  655. return raw_data;
  656. }
  657. struct compat_smb_mount_data {
  658. compat_int_t version;
  659. __compat_uid_t mounted_uid;
  660. __compat_uid_t uid;
  661. __compat_gid_t gid;
  662. compat_mode_t file_mode;
  663. compat_mode_t dir_mode;
  664. };
  665. static void *do_smb_super_data_conv(void *raw_data)
  666. {
  667. struct smb_mount_data *s = raw_data;
  668. struct compat_smb_mount_data *c_s = raw_data;
  669. if (c_s->version != SMB_MOUNT_OLDVERSION)
  670. goto out;
  671. s->dir_mode = c_s->dir_mode;
  672. s->file_mode = c_s->file_mode;
  673. s->gid = c_s->gid;
  674. s->uid = c_s->uid;
  675. s->mounted_uid = c_s->mounted_uid;
  676. out:
  677. return raw_data;
  678. }
  679. struct compat_nfs_string {
  680. compat_uint_t len;
  681. compat_uptr_t data;
  682. };
  683. static inline void compat_nfs_string(struct nfs_string *dst,
  684. struct compat_nfs_string *src)
  685. {
  686. dst->data = compat_ptr(src->data);
  687. dst->len = src->len;
  688. }
  689. struct compat_nfs4_mount_data_v1 {
  690. compat_int_t version;
  691. compat_int_t flags;
  692. compat_int_t rsize;
  693. compat_int_t wsize;
  694. compat_int_t timeo;
  695. compat_int_t retrans;
  696. compat_int_t acregmin;
  697. compat_int_t acregmax;
  698. compat_int_t acdirmin;
  699. compat_int_t acdirmax;
  700. struct compat_nfs_string client_addr;
  701. struct compat_nfs_string mnt_path;
  702. struct compat_nfs_string hostname;
  703. compat_uint_t host_addrlen;
  704. compat_uptr_t host_addr;
  705. compat_int_t proto;
  706. compat_int_t auth_flavourlen;
  707. compat_uptr_t auth_flavours;
  708. };
  709. static int do_nfs4_super_data_conv(void *raw_data)
  710. {
  711. int version = *(compat_uint_t *) raw_data;
  712. if (version == 1) {
  713. struct compat_nfs4_mount_data_v1 *raw = raw_data;
  714. struct nfs4_mount_data *real = raw_data;
  715. /* copy the fields backwards */
  716. real->auth_flavours = compat_ptr(raw->auth_flavours);
  717. real->auth_flavourlen = raw->auth_flavourlen;
  718. real->proto = raw->proto;
  719. real->host_addr = compat_ptr(raw->host_addr);
  720. real->host_addrlen = raw->host_addrlen;
  721. compat_nfs_string(&real->hostname, &raw->hostname);
  722. compat_nfs_string(&real->mnt_path, &raw->mnt_path);
  723. compat_nfs_string(&real->client_addr, &raw->client_addr);
  724. real->acdirmax = raw->acdirmax;
  725. real->acdirmin = raw->acdirmin;
  726. real->acregmax = raw->acregmax;
  727. real->acregmin = raw->acregmin;
  728. real->retrans = raw->retrans;
  729. real->timeo = raw->timeo;
  730. real->wsize = raw->wsize;
  731. real->rsize = raw->rsize;
  732. real->flags = raw->flags;
  733. real->version = raw->version;
  734. }
  735. else {
  736. return -EINVAL;
  737. }
  738. return 0;
  739. }
  740. #define SMBFS_NAME "smbfs"
  741. #define NCPFS_NAME "ncpfs"
  742. #define NFS4_NAME "nfs4"
  743. asmlinkage long compat_sys_mount(char __user * dev_name, char __user * dir_name,
  744. char __user * type, unsigned long flags,
  745. void __user * data)
  746. {
  747. unsigned long type_page;
  748. unsigned long data_page;
  749. unsigned long dev_page;
  750. char *dir_page;
  751. int retval;
  752. retval = copy_mount_options (type, &type_page);
  753. if (retval < 0)
  754. goto out;
  755. dir_page = getname(dir_name);
  756. retval = PTR_ERR(dir_page);
  757. if (IS_ERR(dir_page))
  758. goto out1;
  759. retval = copy_mount_options (dev_name, &dev_page);
  760. if (retval < 0)
  761. goto out2;
  762. retval = copy_mount_options (data, &data_page);
  763. if (retval < 0)
  764. goto out3;
  765. retval = -EINVAL;
  766. if (type_page && data_page) {
  767. if (!strcmp((char *)type_page, SMBFS_NAME)) {
  768. do_smb_super_data_conv((void *)data_page);
  769. } else if (!strcmp((char *)type_page, NCPFS_NAME)) {
  770. do_ncp_super_data_conv((void *)data_page);
  771. } else if (!strcmp((char *)type_page, NFS4_NAME)) {
  772. if (do_nfs4_super_data_conv((void *) data_page))
  773. goto out4;
  774. }
  775. }
  776. lock_kernel();
  777. retval = do_mount((char*)dev_page, dir_page, (char*)type_page,
  778. flags, (void*)data_page);
  779. unlock_kernel();
  780. out4:
  781. free_page(data_page);
  782. out3:
  783. free_page(dev_page);
  784. out2:
  785. putname(dir_page);
  786. out1:
  787. free_page(type_page);
  788. out:
  789. return retval;
  790. }
  791. #define NAME_OFFSET(de) ((int) ((de)->d_name - (char __user *) (de)))
  792. #define COMPAT_ROUND_UP(x) (((x)+sizeof(compat_long_t)-1) & \
  793. ~(sizeof(compat_long_t)-1))
  794. struct compat_old_linux_dirent {
  795. compat_ulong_t d_ino;
  796. compat_ulong_t d_offset;
  797. unsigned short d_namlen;
  798. char d_name[1];
  799. };
  800. struct compat_readdir_callback {
  801. struct compat_old_linux_dirent __user *dirent;
  802. int result;
  803. };
  804. static int compat_fillonedir(void *__buf, const char *name, int namlen,
  805. loff_t offset, u64 ino, unsigned int d_type)
  806. {
  807. struct compat_readdir_callback *buf = __buf;
  808. struct compat_old_linux_dirent __user *dirent;
  809. compat_ulong_t d_ino;
  810. if (buf->result)
  811. return -EINVAL;
  812. d_ino = ino;
  813. if (sizeof(d_ino) < sizeof(ino) && d_ino != ino)
  814. return -EOVERFLOW;
  815. buf->result++;
  816. dirent = buf->dirent;
  817. if (!access_ok(VERIFY_WRITE, dirent,
  818. (unsigned long)(dirent->d_name + namlen + 1) -
  819. (unsigned long)dirent))
  820. goto efault;
  821. if ( __put_user(d_ino, &dirent->d_ino) ||
  822. __put_user(offset, &dirent->d_offset) ||
  823. __put_user(namlen, &dirent->d_namlen) ||
  824. __copy_to_user(dirent->d_name, name, namlen) ||
  825. __put_user(0, dirent->d_name + namlen))
  826. goto efault;
  827. return 0;
  828. efault:
  829. buf->result = -EFAULT;
  830. return -EFAULT;
  831. }
  832. asmlinkage long compat_sys_old_readdir(unsigned int fd,
  833. struct compat_old_linux_dirent __user *dirent, unsigned int count)
  834. {
  835. int error;
  836. struct file *file;
  837. struct compat_readdir_callback buf;
  838. error = -EBADF;
  839. file = fget(fd);
  840. if (!file)
  841. goto out;
  842. buf.result = 0;
  843. buf.dirent = dirent;
  844. error = vfs_readdir(file, compat_fillonedir, &buf);
  845. if (error >= 0)
  846. error = buf.result;
  847. fput(file);
  848. out:
  849. return error;
  850. }
  851. struct compat_linux_dirent {
  852. compat_ulong_t d_ino;
  853. compat_ulong_t d_off;
  854. unsigned short d_reclen;
  855. char d_name[1];
  856. };
  857. struct compat_getdents_callback {
  858. struct compat_linux_dirent __user *current_dir;
  859. struct compat_linux_dirent __user *previous;
  860. int count;
  861. int error;
  862. };
  863. static int compat_filldir(void *__buf, const char *name, int namlen,
  864. loff_t offset, u64 ino, unsigned int d_type)
  865. {
  866. struct compat_linux_dirent __user * dirent;
  867. struct compat_getdents_callback *buf = __buf;
  868. compat_ulong_t d_ino;
  869. int reclen = COMPAT_ROUND_UP(NAME_OFFSET(dirent) + namlen + 2);
  870. buf->error = -EINVAL; /* only used if we fail.. */
  871. if (reclen > buf->count)
  872. return -EINVAL;
  873. d_ino = ino;
  874. if (sizeof(d_ino) < sizeof(ino) && d_ino != ino)
  875. return -EOVERFLOW;
  876. dirent = buf->previous;
  877. if (dirent) {
  878. if (__put_user(offset, &dirent->d_off))
  879. goto efault;
  880. }
  881. dirent = buf->current_dir;
  882. if (__put_user(d_ino, &dirent->d_ino))
  883. goto efault;
  884. if (__put_user(reclen, &dirent->d_reclen))
  885. goto efault;
  886. if (copy_to_user(dirent->d_name, name, namlen))
  887. goto efault;
  888. if (__put_user(0, dirent->d_name + namlen))
  889. goto efault;
  890. if (__put_user(d_type, (char __user *) dirent + reclen - 1))
  891. goto efault;
  892. buf->previous = dirent;
  893. dirent = (void __user *)dirent + reclen;
  894. buf->current_dir = dirent;
  895. buf->count -= reclen;
  896. return 0;
  897. efault:
  898. buf->error = -EFAULT;
  899. return -EFAULT;
  900. }
  901. asmlinkage long compat_sys_getdents(unsigned int fd,
  902. struct compat_linux_dirent __user *dirent, unsigned int count)
  903. {
  904. struct file * file;
  905. struct compat_linux_dirent __user * lastdirent;
  906. struct compat_getdents_callback buf;
  907. int error;
  908. error = -EFAULT;
  909. if (!access_ok(VERIFY_WRITE, dirent, count))
  910. goto out;
  911. error = -EBADF;
  912. file = fget(fd);
  913. if (!file)
  914. goto out;
  915. buf.current_dir = dirent;
  916. buf.previous = NULL;
  917. buf.count = count;
  918. buf.error = 0;
  919. error = vfs_readdir(file, compat_filldir, &buf);
  920. if (error < 0)
  921. goto out_putf;
  922. error = buf.error;
  923. lastdirent = buf.previous;
  924. if (lastdirent) {
  925. if (put_user(file->f_pos, &lastdirent->d_off))
  926. error = -EFAULT;
  927. else
  928. error = count - buf.count;
  929. }
  930. out_putf:
  931. fput(file);
  932. out:
  933. return error;
  934. }
  935. #ifndef __ARCH_OMIT_COMPAT_SYS_GETDENTS64
  936. #define COMPAT_ROUND_UP64(x) (((x)+sizeof(u64)-1) & ~(sizeof(u64)-1))
  937. struct compat_getdents_callback64 {
  938. struct linux_dirent64 __user *current_dir;
  939. struct linux_dirent64 __user *previous;
  940. int count;
  941. int error;
  942. };
  943. static int compat_filldir64(void * __buf, const char * name, int namlen, loff_t offset,
  944. u64 ino, unsigned int d_type)
  945. {
  946. struct linux_dirent64 __user *dirent;
  947. struct compat_getdents_callback64 *buf = __buf;
  948. int jj = NAME_OFFSET(dirent);
  949. int reclen = COMPAT_ROUND_UP64(jj + namlen + 1);
  950. u64 off;
  951. buf->error = -EINVAL; /* only used if we fail.. */
  952. if (reclen > buf->count)
  953. return -EINVAL;
  954. dirent = buf->previous;
  955. if (dirent) {
  956. if (__put_user_unaligned(offset, &dirent->d_off))
  957. goto efault;
  958. }
  959. dirent = buf->current_dir;
  960. if (__put_user_unaligned(ino, &dirent->d_ino))
  961. goto efault;
  962. off = 0;
  963. if (__put_user_unaligned(off, &dirent->d_off))
  964. goto efault;
  965. if (__put_user(reclen, &dirent->d_reclen))
  966. goto efault;
  967. if (__put_user(d_type, &dirent->d_type))
  968. goto efault;
  969. if (copy_to_user(dirent->d_name, name, namlen))
  970. goto efault;
  971. if (__put_user(0, dirent->d_name + namlen))
  972. goto efault;
  973. buf->previous = dirent;
  974. dirent = (void __user *)dirent + reclen;
  975. buf->current_dir = dirent;
  976. buf->count -= reclen;
  977. return 0;
  978. efault:
  979. buf->error = -EFAULT;
  980. return -EFAULT;
  981. }
  982. asmlinkage long compat_sys_getdents64(unsigned int fd,
  983. struct linux_dirent64 __user * dirent, unsigned int count)
  984. {
  985. struct file * file;
  986. struct linux_dirent64 __user * lastdirent;
  987. struct compat_getdents_callback64 buf;
  988. int error;
  989. error = -EFAULT;
  990. if (!access_ok(VERIFY_WRITE, dirent, count))
  991. goto out;
  992. error = -EBADF;
  993. file = fget(fd);
  994. if (!file)
  995. goto out;
  996. buf.current_dir = dirent;
  997. buf.previous = NULL;
  998. buf.count = count;
  999. buf.error = 0;
  1000. error = vfs_readdir(file, compat_filldir64, &buf);
  1001. if (error < 0)
  1002. goto out_putf;
  1003. error = buf.error;
  1004. lastdirent = buf.previous;
  1005. if (lastdirent) {
  1006. typeof(lastdirent->d_off) d_off = file->f_pos;
  1007. error = -EFAULT;
  1008. if (__put_user_unaligned(d_off, &lastdirent->d_off))
  1009. goto out_putf;
  1010. error = count - buf.count;
  1011. }
  1012. out_putf:
  1013. fput(file);
  1014. out:
  1015. return error;
  1016. }
  1017. #endif /* ! __ARCH_OMIT_COMPAT_SYS_GETDENTS64 */
  1018. static ssize_t compat_do_readv_writev(int type, struct file *file,
  1019. const struct compat_iovec __user *uvector,
  1020. unsigned long nr_segs, loff_t *pos)
  1021. {
  1022. compat_ssize_t tot_len;
  1023. struct iovec iovstack[UIO_FASTIOV];
  1024. struct iovec *iov=iovstack, *vector;
  1025. ssize_t ret;
  1026. int seg;
  1027. io_fn_t fn;
  1028. iov_fn_t fnv;
  1029. /*
  1030. * SuS says "The readv() function *may* fail if the iovcnt argument
  1031. * was less than or equal to 0, or greater than {IOV_MAX}. Linux has
  1032. * traditionally returned zero for zero segments, so...
  1033. */
  1034. ret = 0;
  1035. if (nr_segs == 0)
  1036. goto out;
  1037. /*
  1038. * First get the "struct iovec" from user memory and
  1039. * verify all the pointers
  1040. */
  1041. ret = -EINVAL;
  1042. if ((nr_segs > UIO_MAXIOV) || (nr_segs <= 0))
  1043. goto out;
  1044. if (!file->f_op)
  1045. goto out;
  1046. if (nr_segs > UIO_FASTIOV) {
  1047. ret = -ENOMEM;
  1048. iov = kmalloc(nr_segs*sizeof(struct iovec), GFP_KERNEL);
  1049. if (!iov)
  1050. goto out;
  1051. }
  1052. ret = -EFAULT;
  1053. if (!access_ok(VERIFY_READ, uvector, nr_segs*sizeof(*uvector)))
  1054. goto out;
  1055. /*
  1056. * Single unix specification:
  1057. * We should -EINVAL if an element length is not >= 0 and fitting an
  1058. * ssize_t. The total length is fitting an ssize_t
  1059. *
  1060. * Be careful here because iov_len is a size_t not an ssize_t
  1061. */
  1062. tot_len = 0;
  1063. vector = iov;
  1064. ret = -EINVAL;
  1065. for (seg = 0 ; seg < nr_segs; seg++) {
  1066. compat_ssize_t tmp = tot_len;
  1067. compat_ssize_t len;
  1068. compat_uptr_t buf;
  1069. if (__get_user(len, &uvector->iov_len) ||
  1070. __get_user(buf, &uvector->iov_base)) {
  1071. ret = -EFAULT;
  1072. goto out;
  1073. }
  1074. if (len < 0) /* size_t not fitting an compat_ssize_t .. */
  1075. goto out;
  1076. tot_len += len;
  1077. if (tot_len < tmp) /* maths overflow on the compat_ssize_t */
  1078. goto out;
  1079. vector->iov_base = compat_ptr(buf);
  1080. vector->iov_len = (compat_size_t) len;
  1081. uvector++;
  1082. vector++;
  1083. }
  1084. if (tot_len == 0) {
  1085. ret = 0;
  1086. goto out;
  1087. }
  1088. ret = rw_verify_area(type, file, pos, tot_len);
  1089. if (ret < 0)
  1090. goto out;
  1091. ret = security_file_permission(file, type == READ ? MAY_READ:MAY_WRITE);
  1092. if (ret)
  1093. goto out;
  1094. fnv = NULL;
  1095. if (type == READ) {
  1096. fn = file->f_op->read;
  1097. fnv = file->f_op->aio_read;
  1098. } else {
  1099. fn = (io_fn_t)file->f_op->write;
  1100. fnv = file->f_op->aio_write;
  1101. }
  1102. if (fnv)
  1103. ret = do_sync_readv_writev(file, iov, nr_segs, tot_len,
  1104. pos, fnv);
  1105. else
  1106. ret = do_loop_readv_writev(file, iov, nr_segs, pos, fn);
  1107. out:
  1108. if (iov != iovstack)
  1109. kfree(iov);
  1110. if ((ret + (type == READ)) > 0) {
  1111. struct dentry *dentry = file->f_path.dentry;
  1112. if (type == READ)
  1113. fsnotify_access(dentry);
  1114. else
  1115. fsnotify_modify(dentry);
  1116. }
  1117. return ret;
  1118. }
  1119. asmlinkage ssize_t
  1120. compat_sys_readv(unsigned long fd, const struct compat_iovec __user *vec, unsigned long vlen)
  1121. {
  1122. struct file *file;
  1123. ssize_t ret = -EBADF;
  1124. file = fget(fd);
  1125. if (!file)
  1126. return -EBADF;
  1127. if (!(file->f_mode & FMODE_READ))
  1128. goto out;
  1129. ret = -EINVAL;
  1130. if (!file->f_op || (!file->f_op->aio_read && !file->f_op->read))
  1131. goto out;
  1132. ret = compat_do_readv_writev(READ, file, vec, vlen, &file->f_pos);
  1133. out:
  1134. fput(file);
  1135. return ret;
  1136. }
  1137. asmlinkage ssize_t
  1138. compat_sys_writev(unsigned long fd, const struct compat_iovec __user *vec, unsigned long vlen)
  1139. {
  1140. struct file *file;
  1141. ssize_t ret = -EBADF;
  1142. file = fget(fd);
  1143. if (!file)
  1144. return -EBADF;
  1145. if (!(file->f_mode & FMODE_WRITE))
  1146. goto out;
  1147. ret = -EINVAL;
  1148. if (!file->f_op || (!file->f_op->aio_write && !file->f_op->write))
  1149. goto out;
  1150. ret = compat_do_readv_writev(WRITE, file, vec, vlen, &file->f_pos);
  1151. out:
  1152. fput(file);
  1153. return ret;
  1154. }
  1155. asmlinkage long
  1156. compat_sys_vmsplice(int fd, const struct compat_iovec __user *iov32,
  1157. unsigned int nr_segs, unsigned int flags)
  1158. {
  1159. unsigned i;
  1160. struct iovec __user *iov;
  1161. if (nr_segs > UIO_MAXIOV)
  1162. return -EINVAL;
  1163. iov = compat_alloc_user_space(nr_segs * sizeof(struct iovec));
  1164. for (i = 0; i < nr_segs; i++) {
  1165. struct compat_iovec v;
  1166. if (get_user(v.iov_base, &iov32[i].iov_base) ||
  1167. get_user(v.iov_len, &iov32[i].iov_len) ||
  1168. put_user(compat_ptr(v.iov_base), &iov[i].iov_base) ||
  1169. put_user(v.iov_len, &iov[i].iov_len))
  1170. return -EFAULT;
  1171. }
  1172. return sys_vmsplice(fd, iov, nr_segs, flags);
  1173. }
  1174. /*
  1175. * Exactly like fs/open.c:sys_open(), except that it doesn't set the
  1176. * O_LARGEFILE flag.
  1177. */
  1178. asmlinkage long
  1179. compat_sys_open(const char __user *filename, int flags, int mode)
  1180. {
  1181. return do_sys_open(AT_FDCWD, filename, flags, mode);
  1182. }
  1183. /*
  1184. * Exactly like fs/open.c:sys_openat(), except that it doesn't set the
  1185. * O_LARGEFILE flag.
  1186. */
  1187. asmlinkage long
  1188. compat_sys_openat(unsigned int dfd, const char __user *filename, int flags, int mode)
  1189. {
  1190. return do_sys_open(dfd, filename, flags, mode);
  1191. }
  1192. /*
  1193. * compat_count() counts the number of arguments/envelopes. It is basically
  1194. * a copy of count() from fs/exec.c, except that it works with 32 bit argv
  1195. * and envp pointers.
  1196. */
  1197. static int compat_count(compat_uptr_t __user *argv, int max)
  1198. {
  1199. int i = 0;
  1200. if (argv != NULL) {
  1201. for (;;) {
  1202. compat_uptr_t p;
  1203. if (get_user(p, argv))
  1204. return -EFAULT;
  1205. if (!p)
  1206. break;
  1207. argv++;
  1208. if(++i > max)
  1209. return -E2BIG;
  1210. }
  1211. }
  1212. return i;
  1213. }
  1214. /*
  1215. * compat_copy_strings() is basically a copy of copy_strings() from fs/exec.c
  1216. * except that it works with 32 bit argv and envp pointers.
  1217. */
  1218. static int compat_copy_strings(int argc, compat_uptr_t __user *argv,
  1219. struct linux_binprm *bprm)
  1220. {
  1221. struct page *kmapped_page = NULL;
  1222. char *kaddr = NULL;
  1223. int ret;
  1224. while (argc-- > 0) {
  1225. compat_uptr_t str;
  1226. int len;
  1227. unsigned long pos;
  1228. if (get_user(str, argv+argc) ||
  1229. !(len = strnlen_user(compat_ptr(str), bprm->p))) {
  1230. ret = -EFAULT;
  1231. goto out;
  1232. }
  1233. if (bprm->p < len) {
  1234. ret = -E2BIG;
  1235. goto out;
  1236. }
  1237. bprm->p -= len;
  1238. /* XXX: add architecture specific overflow check here. */
  1239. pos = bprm->p;
  1240. while (len > 0) {
  1241. int i, new, err;
  1242. int offset, bytes_to_copy;
  1243. struct page *page;
  1244. offset = pos % PAGE_SIZE;
  1245. i = pos/PAGE_SIZE;
  1246. page = bprm->page[i];
  1247. new = 0;
  1248. if (!page) {
  1249. page = alloc_page(GFP_HIGHUSER);
  1250. bprm->page[i] = page;
  1251. if (!page) {
  1252. ret = -ENOMEM;
  1253. goto out;
  1254. }
  1255. new = 1;
  1256. }
  1257. if (page != kmapped_page) {
  1258. if (kmapped_page)
  1259. kunmap(kmapped_page);
  1260. kmapped_page = page;
  1261. kaddr = kmap(kmapped_page);
  1262. }
  1263. if (new && offset)
  1264. memset(kaddr, 0, offset);
  1265. bytes_to_copy = PAGE_SIZE - offset;
  1266. if (bytes_to_copy > len) {
  1267. bytes_to_copy = len;
  1268. if (new)
  1269. memset(kaddr+offset+len, 0,
  1270. PAGE_SIZE-offset-len);
  1271. }
  1272. err = copy_from_user(kaddr+offset, compat_ptr(str),
  1273. bytes_to_copy);
  1274. if (err) {
  1275. ret = -EFAULT;
  1276. goto out;
  1277. }
  1278. pos += bytes_to_copy;
  1279. str += bytes_to_copy;
  1280. len -= bytes_to_copy;
  1281. }
  1282. }
  1283. ret = 0;
  1284. out:
  1285. if (kmapped_page)
  1286. kunmap(kmapped_page);
  1287. return ret;
  1288. }
  1289. #ifdef CONFIG_MMU
  1290. #define free_arg_pages(bprm) do { } while (0)
  1291. #else
  1292. static inline void free_arg_pages(struct linux_binprm *bprm)
  1293. {
  1294. int i;
  1295. for (i = 0; i < MAX_ARG_PAGES; i++) {
  1296. if (bprm->page[i])
  1297. __free_page(bprm->page[i]);
  1298. bprm->page[i] = NULL;
  1299. }
  1300. }
  1301. #endif /* CONFIG_MMU */
  1302. /*
  1303. * compat_do_execve() is mostly a copy of do_execve(), with the exception
  1304. * that it processes 32 bit argv and envp pointers.
  1305. */
  1306. int compat_do_execve(char * filename,
  1307. compat_uptr_t __user *argv,
  1308. compat_uptr_t __user *envp,
  1309. struct pt_regs * regs)
  1310. {
  1311. struct linux_binprm *bprm;
  1312. struct file *file;
  1313. int retval;
  1314. int i;
  1315. retval = -ENOMEM;
  1316. bprm = kzalloc(sizeof(*bprm), GFP_KERNEL);
  1317. if (!bprm)
  1318. goto out_ret;
  1319. file = open_exec(filename);
  1320. retval = PTR_ERR(file);
  1321. if (IS_ERR(file))
  1322. goto out_kfree;
  1323. sched_exec();
  1324. bprm->p = PAGE_SIZE*MAX_ARG_PAGES-sizeof(void *);
  1325. bprm->file = file;
  1326. bprm->filename = filename;
  1327. bprm->interp = filename;
  1328. bprm->mm = mm_alloc();
  1329. retval = -ENOMEM;
  1330. if (!bprm->mm)
  1331. goto out_file;
  1332. retval = init_new_context(current, bprm->mm);
  1333. if (retval < 0)
  1334. goto out_mm;
  1335. bprm->argc = compat_count(argv, bprm->p / sizeof(compat_uptr_t));
  1336. if ((retval = bprm->argc) < 0)
  1337. goto out_mm;
  1338. bprm->envc = compat_count(envp, bprm->p / sizeof(compat_uptr_t));
  1339. if ((retval = bprm->envc) < 0)
  1340. goto out_mm;
  1341. retval = security_bprm_alloc(bprm);
  1342. if (retval)
  1343. goto out;
  1344. retval = prepare_binprm(bprm);
  1345. if (retval < 0)
  1346. goto out;
  1347. retval = copy_strings_kernel(1, &bprm->filename, bprm);
  1348. if (retval < 0)
  1349. goto out;
  1350. bprm->exec = bprm->p;
  1351. retval = compat_copy_strings(bprm->envc, envp, bprm);
  1352. if (retval < 0)
  1353. goto out;
  1354. retval = compat_copy_strings(bprm->argc, argv, bprm);
  1355. if (retval < 0)
  1356. goto out;
  1357. retval = search_binary_handler(bprm, regs);
  1358. if (retval >= 0) {
  1359. free_arg_pages(bprm);
  1360. /* execve success */
  1361. security_bprm_free(bprm);
  1362. acct_update_integrals(current);
  1363. kfree(bprm);
  1364. return retval;
  1365. }
  1366. out:
  1367. /* Something went wrong, return the inode and free the argument pages*/
  1368. for (i = 0 ; i < MAX_ARG_PAGES ; i++) {
  1369. struct page * page = bprm->page[i];
  1370. if (page)
  1371. __free_page(page);
  1372. }
  1373. if (bprm->security)
  1374. security_bprm_free(bprm);
  1375. out_mm:
  1376. if (bprm->mm)
  1377. mmdrop(bprm->mm);
  1378. out_file:
  1379. if (bprm->file) {
  1380. allow_write_access(bprm->file);
  1381. fput(bprm->file);
  1382. }
  1383. out_kfree:
  1384. kfree(bprm);
  1385. out_ret:
  1386. return retval;
  1387. }
  1388. #define __COMPAT_NFDBITS (8 * sizeof(compat_ulong_t))
  1389. #define ROUND_UP(x,y) (((x)+(y)-1)/(y))
  1390. /*
  1391. * Ooo, nasty. We need here to frob 32-bit unsigned longs to
  1392. * 64-bit unsigned longs.
  1393. */
  1394. static
  1395. int compat_get_fd_set(unsigned long nr, compat_ulong_t __user *ufdset,
  1396. unsigned long *fdset)
  1397. {
  1398. nr = ROUND_UP(nr, __COMPAT_NFDBITS);
  1399. if (ufdset) {
  1400. unsigned long odd;
  1401. if (!access_ok(VERIFY_WRITE, ufdset, nr*sizeof(compat_ulong_t)))
  1402. return -EFAULT;
  1403. odd = nr & 1UL;
  1404. nr &= ~1UL;
  1405. while (nr) {
  1406. unsigned long h, l;
  1407. if (__get_user(l, ufdset) || __get_user(h, ufdset+1))
  1408. return -EFAULT;
  1409. ufdset += 2;
  1410. *fdset++ = h << 32 | l;
  1411. nr -= 2;
  1412. }
  1413. if (odd && __get_user(*fdset, ufdset))
  1414. return -EFAULT;
  1415. } else {
  1416. /* Tricky, must clear full unsigned long in the
  1417. * kernel fdset at the end, this makes sure that
  1418. * actually happens.
  1419. */
  1420. memset(fdset, 0, ((nr + 1) & ~1)*sizeof(compat_ulong_t));
  1421. }
  1422. return 0;
  1423. }
  1424. static
  1425. int compat_set_fd_set(unsigned long nr, compat_ulong_t __user *ufdset,
  1426. unsigned long *fdset)
  1427. {
  1428. unsigned long odd;
  1429. nr = ROUND_UP(nr, __COMPAT_NFDBITS);
  1430. if (!ufdset)
  1431. return 0;
  1432. odd = nr & 1UL;
  1433. nr &= ~1UL;
  1434. while (nr) {
  1435. unsigned long h, l;
  1436. l = *fdset++;
  1437. h = l >> 32;
  1438. if (__put_user(l, ufdset) || __put_user(h, ufdset+1))
  1439. return -EFAULT;
  1440. ufdset += 2;
  1441. nr -= 2;
  1442. }
  1443. if (odd && __put_user(*fdset, ufdset))
  1444. return -EFAULT;
  1445. return 0;
  1446. }
  1447. /*
  1448. * This is a virtual copy of sys_select from fs/select.c and probably
  1449. * should be compared to it from time to time
  1450. */
  1451. /*
  1452. * We can actually return ERESTARTSYS instead of EINTR, but I'd
  1453. * like to be certain this leads to no problems. So I return
  1454. * EINTR just for safety.
  1455. *
  1456. * Update: ERESTARTSYS breaks at least the xview clock binary, so
  1457. * I'm trying ERESTARTNOHAND which restart only when you want to.
  1458. */
  1459. #define MAX_SELECT_SECONDS \
  1460. ((unsigned long) (MAX_SCHEDULE_TIMEOUT / HZ)-1)
  1461. int compat_core_sys_select(int n, compat_ulong_t __user *inp,
  1462. compat_ulong_t __user *outp, compat_ulong_t __user *exp, s64 *timeout)
  1463. {
  1464. fd_set_bits fds;
  1465. char *bits;
  1466. int size, max_fds, ret = -EINVAL;
  1467. struct fdtable *fdt;
  1468. if (n < 0)
  1469. goto out_nofds;
  1470. /* max_fds can increase, so grab it once to avoid race */
  1471. rcu_read_lock();
  1472. fdt = files_fdtable(current->files);
  1473. max_fds = fdt->max_fds;
  1474. rcu_read_unlock();
  1475. if (n > max_fds)
  1476. n = max_fds;
  1477. /*
  1478. * We need 6 bitmaps (in/out/ex for both incoming and outgoing),
  1479. * since we used fdset we need to allocate memory in units of
  1480. * long-words.
  1481. */
  1482. ret = -ENOMEM;
  1483. size = FDS_BYTES(n);
  1484. bits = kmalloc(6 * size, GFP_KERNEL);
  1485. if (!bits)
  1486. goto out_nofds;
  1487. fds.in = (unsigned long *) bits;
  1488. fds.out = (unsigned long *) (bits + size);
  1489. fds.ex = (unsigned long *) (bits + 2*size);
  1490. fds.res_in = (unsigned long *) (bits + 3*size);
  1491. fds.res_out = (unsigned long *) (bits + 4*size);
  1492. fds.res_ex = (unsigned long *) (bits + 5*size);
  1493. if ((ret = compat_get_fd_set(n, inp, fds.in)) ||
  1494. (ret = compat_get_fd_set(n, outp, fds.out)) ||
  1495. (ret = compat_get_fd_set(n, exp, fds.ex)))
  1496. goto out;
  1497. zero_fd_set(n, fds.res_in);
  1498. zero_fd_set(n, fds.res_out);
  1499. zero_fd_set(n, fds.res_ex);
  1500. ret = do_select(n, &fds, timeout);
  1501. if (ret < 0)
  1502. goto out;
  1503. if (!ret) {
  1504. ret = -ERESTARTNOHAND;
  1505. if (signal_pending(current))
  1506. goto out;
  1507. ret = 0;
  1508. }
  1509. if (compat_set_fd_set(n, inp, fds.res_in) ||
  1510. compat_set_fd_set(n, outp, fds.res_out) ||
  1511. compat_set_fd_set(n, exp, fds.res_ex))
  1512. ret = -EFAULT;
  1513. out:
  1514. kfree(bits);
  1515. out_nofds:
  1516. return ret;
  1517. }
  1518. asmlinkage long compat_sys_select(int n, compat_ulong_t __user *inp,
  1519. compat_ulong_t __user *outp, compat_ulong_t __user *exp,
  1520. struct compat_timeval __user *tvp)
  1521. {
  1522. s64 timeout = -1;
  1523. struct compat_timeval tv;
  1524. int ret;
  1525. if (tvp) {
  1526. if (copy_from_user(&tv, tvp, sizeof(tv)))
  1527. return -EFAULT;
  1528. if (tv.tv_sec < 0 || tv.tv_usec < 0)
  1529. return -EINVAL;
  1530. /* Cast to u64 to make GCC stop complaining */
  1531. if ((u64)tv.tv_sec >= (u64)MAX_INT64_SECONDS)
  1532. timeout = -1; /* infinite */
  1533. else {
  1534. timeout = ROUND_UP(tv.tv_usec, 1000000/HZ);
  1535. timeout += tv.tv_sec * HZ;
  1536. }
  1537. }
  1538. ret = compat_core_sys_select(n, inp, outp, exp, &timeout);
  1539. if (tvp) {
  1540. struct compat_timeval rtv;
  1541. if (current->personality & STICKY_TIMEOUTS)
  1542. goto sticky;
  1543. rtv.tv_usec = jiffies_to_usecs(do_div((*(u64*)&timeout), HZ));
  1544. rtv.tv_sec = timeout;
  1545. if (compat_timeval_compare(&rtv, &tv) >= 0)
  1546. rtv = tv;
  1547. if (copy_to_user(tvp, &rtv, sizeof(rtv))) {
  1548. sticky:
  1549. /*
  1550. * If an application puts its timeval in read-only
  1551. * memory, we don't want the Linux-specific update to
  1552. * the timeval to cause a fault after the select has
  1553. * completed successfully. However, because we're not
  1554. * updating the timeval, we can't restart the system
  1555. * call.
  1556. */
  1557. if (ret == -ERESTARTNOHAND)
  1558. ret = -EINTR;
  1559. }
  1560. }
  1561. return ret;
  1562. }
  1563. #ifdef TIF_RESTORE_SIGMASK
  1564. asmlinkage long compat_sys_pselect7(int n, compat_ulong_t __user *inp,
  1565. compat_ulong_t __user *outp, compat_ulong_t __user *exp,
  1566. struct compat_timespec __user *tsp, compat_sigset_t __user *sigmask,
  1567. compat_size_t sigsetsize)
  1568. {
  1569. compat_sigset_t ss32;
  1570. sigset_t ksigmask, sigsaved;
  1571. s64 timeout = MAX_SCHEDULE_TIMEOUT;
  1572. struct compat_timespec ts;
  1573. int ret;
  1574. if (tsp) {
  1575. if (copy_from_user(&ts, tsp, sizeof(ts)))
  1576. return -EFAULT;
  1577. if (ts.tv_sec < 0 || ts.tv_nsec < 0)
  1578. return -EINVAL;
  1579. }
  1580. if (sigmask) {
  1581. if (sigsetsize != sizeof(compat_sigset_t))
  1582. return -EINVAL;
  1583. if (copy_from_user(&ss32, sigmask, sizeof(ss32)))
  1584. return -EFAULT;
  1585. sigset_from_compat(&ksigmask, &ss32);
  1586. sigdelsetmask(&ksigmask, sigmask(SIGKILL)|sigmask(SIGSTOP));
  1587. sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
  1588. }
  1589. do {
  1590. if (tsp) {
  1591. if ((unsigned long)ts.tv_sec < MAX_SELECT_SECONDS) {
  1592. timeout = ROUND_UP(ts.tv_nsec, 1000000000/HZ);
  1593. timeout += ts.tv_sec * (unsigned long)HZ;
  1594. ts.tv_sec = 0;
  1595. ts.tv_nsec = 0;
  1596. } else {
  1597. ts.tv_sec -= MAX_SELECT_SECONDS;
  1598. timeout = MAX_SELECT_SECONDS * HZ;
  1599. }
  1600. }
  1601. ret = compat_core_sys_select(n, inp, outp, exp, &timeout);
  1602. } while (!ret && !timeout && tsp && (ts.tv_sec || ts.tv_nsec));
  1603. if (tsp) {
  1604. struct compat_timespec rts;
  1605. if (current->personality & STICKY_TIMEOUTS)
  1606. goto sticky;
  1607. rts.tv_sec = timeout / HZ;
  1608. rts.tv_nsec = (timeout % HZ) * (NSEC_PER_SEC/HZ);
  1609. if (rts.tv_nsec >= NSEC_PER_SEC) {
  1610. rts.tv_sec++;
  1611. rts.tv_nsec -= NSEC_PER_SEC;
  1612. }
  1613. if (compat_timespec_compare(&rts, &ts) >= 0)
  1614. rts = ts;
  1615. if (copy_to_user(tsp, &rts, sizeof(rts))) {
  1616. sticky:
  1617. /*
  1618. * If an application puts its timeval in read-only
  1619. * memory, we don't want the Linux-specific update to
  1620. * the timeval to cause a fault after the select has
  1621. * completed successfully. However, because we're not
  1622. * updating the timeval, we can't restart the system
  1623. * call.
  1624. */
  1625. if (ret == -ERESTARTNOHAND)
  1626. ret = -EINTR;
  1627. }
  1628. }
  1629. if (ret == -ERESTARTNOHAND) {
  1630. /*
  1631. * Don't restore the signal mask yet. Let do_signal() deliver
  1632. * the signal on the way back to userspace, before the signal
  1633. * mask is restored.
  1634. */
  1635. if (sigmask) {
  1636. memcpy(&current->saved_sigmask, &sigsaved,
  1637. sizeof(sigsaved));
  1638. set_thread_flag(TIF_RESTORE_SIGMASK);
  1639. }
  1640. } else if (sigmask)
  1641. sigprocmask(SIG_SETMASK, &sigsaved, NULL);
  1642. return ret;
  1643. }
  1644. asmlinkage long compat_sys_pselect6(int n, compat_ulong_t __user *inp,
  1645. compat_ulong_t __user *outp, compat_ulong_t __user *exp,
  1646. struct compat_timespec __user *tsp, void __user *sig)
  1647. {
  1648. compat_size_t sigsetsize = 0;
  1649. compat_uptr_t up = 0;
  1650. if (sig) {
  1651. if (!access_ok(VERIFY_READ, sig,
  1652. sizeof(compat_uptr_t)+sizeof(compat_size_t)) ||
  1653. __get_user(up, (compat_uptr_t __user *)sig) ||
  1654. __get_user(sigsetsize,
  1655. (compat_size_t __user *)(sig+sizeof(up))))
  1656. return -EFAULT;
  1657. }
  1658. return compat_sys_pselect7(n, inp, outp, exp, tsp, compat_ptr(up),
  1659. sigsetsize);
  1660. }
  1661. asmlinkage long compat_sys_ppoll(struct pollfd __user *ufds,
  1662. unsigned int nfds, struct compat_timespec __user *tsp,
  1663. const compat_sigset_t __user *sigmask, compat_size_t sigsetsize)
  1664. {
  1665. compat_sigset_t ss32;
  1666. sigset_t ksigmask, sigsaved;
  1667. struct compat_timespec ts;
  1668. s64 timeout = -1;
  1669. int ret;
  1670. if (tsp) {
  1671. if (copy_from_user(&ts, tsp, sizeof(ts)))
  1672. return -EFAULT;
  1673. /* We assume that ts.tv_sec is always lower than
  1674. the number of seconds that can be expressed in
  1675. an s64. Otherwise the compiler bitches at us */
  1676. timeout = ROUND_UP(ts.tv_nsec, 1000000000/HZ);
  1677. timeout += ts.tv_sec * HZ;
  1678. }
  1679. if (sigmask) {
  1680. if (sigsetsize != sizeof(compat_sigset_t))
  1681. return -EINVAL;
  1682. if (copy_from_user(&ss32, sigmask, sizeof(ss32)))
  1683. return -EFAULT;
  1684. sigset_from_compat(&ksigmask, &ss32);
  1685. sigdelsetmask(&ksigmask, sigmask(SIGKILL)|sigmask(SIGSTOP));
  1686. sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
  1687. }
  1688. ret = do_sys_poll(ufds, nfds, &timeout);
  1689. /* We can restart this syscall, usually */
  1690. if (ret == -EINTR) {
  1691. /*
  1692. * Don't restore the signal mask yet. Let do_signal() deliver
  1693. * the signal on the way back to userspace, before the signal
  1694. * mask is restored.
  1695. */
  1696. if (sigmask) {
  1697. memcpy(&current->saved_sigmask, &sigsaved,
  1698. sizeof(sigsaved));
  1699. set_thread_flag(TIF_RESTORE_SIGMASK);
  1700. }
  1701. ret = -ERESTARTNOHAND;
  1702. } else if (sigmask)
  1703. sigprocmask(SIG_SETMASK, &sigsaved, NULL);
  1704. if (tsp && timeout >= 0) {
  1705. struct compat_timespec rts;
  1706. if (current->personality & STICKY_TIMEOUTS)
  1707. goto sticky;
  1708. /* Yes, we know it's actually an s64, but it's also positive. */
  1709. rts.tv_nsec = jiffies_to_usecs(do_div((*(u64*)&timeout), HZ)) *
  1710. 1000;
  1711. rts.tv_sec = timeout;
  1712. if (compat_timespec_compare(&rts, &ts) >= 0)
  1713. rts = ts;
  1714. if (copy_to_user(tsp, &rts, sizeof(rts))) {
  1715. sticky:
  1716. /*
  1717. * If an application puts its timeval in read-only
  1718. * memory, we don't want the Linux-specific update to
  1719. * the timeval to cause a fault after the select has
  1720. * completed successfully. However, because we're not
  1721. * updating the timeval, we can't restart the system
  1722. * call.
  1723. */
  1724. if (ret == -ERESTARTNOHAND && timeout >= 0)
  1725. ret = -EINTR;
  1726. }
  1727. }
  1728. return ret;
  1729. }
  1730. #endif /* TIF_RESTORE_SIGMASK */
  1731. #if defined(CONFIG_NFSD) || defined(CONFIG_NFSD_MODULE)
  1732. /* Stuff for NFS server syscalls... */
  1733. struct compat_nfsctl_svc {
  1734. u16 svc32_port;
  1735. s32 svc32_nthreads;
  1736. };
  1737. struct compat_nfsctl_client {
  1738. s8 cl32_ident[NFSCLNT_IDMAX+1];
  1739. s32 cl32_naddr;
  1740. struct in_addr cl32_addrlist[NFSCLNT_ADDRMAX];
  1741. s32 cl32_fhkeytype;
  1742. s32 cl32_fhkeylen;
  1743. u8 cl32_fhkey[NFSCLNT_KEYMAX];
  1744. };
  1745. struct compat_nfsctl_export {
  1746. char ex32_client[NFSCLNT_IDMAX+1];
  1747. char ex32_path[NFS_MAXPATHLEN+1];
  1748. compat_dev_t ex32_dev;
  1749. compat_ino_t ex32_ino;
  1750. compat_int_t ex32_flags;
  1751. __compat_uid_t ex32_anon_uid;
  1752. __compat_gid_t ex32_anon_gid;
  1753. };
  1754. struct compat_nfsctl_fdparm {
  1755. struct sockaddr gd32_addr;
  1756. s8 gd32_path[NFS_MAXPATHLEN+1];
  1757. compat_int_t gd32_version;
  1758. };
  1759. struct compat_nfsctl_fsparm {
  1760. struct sockaddr gd32_addr;
  1761. s8 gd32_path[NFS_MAXPATHLEN+1];
  1762. compat_int_t gd32_maxlen;
  1763. };
  1764. struct compat_nfsctl_arg {
  1765. compat_int_t ca32_version; /* safeguard */
  1766. union {
  1767. struct compat_nfsctl_svc u32_svc;
  1768. struct compat_nfsctl_client u32_client;
  1769. struct compat_nfsctl_export u32_export;
  1770. struct compat_nfsctl_fdparm u32_getfd;
  1771. struct compat_nfsctl_fsparm u32_getfs;
  1772. } u;
  1773. #define ca32_svc u.u32_svc
  1774. #define ca32_client u.u32_client
  1775. #define ca32_export u.u32_export
  1776. #define ca32_getfd u.u32_getfd
  1777. #define ca32_getfs u.u32_getfs
  1778. };
  1779. union compat_nfsctl_res {
  1780. __u8 cr32_getfh[NFS_FHSIZE];
  1781. struct knfsd_fh cr32_getfs;
  1782. };
  1783. static int compat_nfs_svc_trans(struct nfsctl_arg *karg,
  1784. struct compat_nfsctl_arg __user *arg)
  1785. {
  1786. if (!access_ok(VERIFY_READ, &arg->ca32_svc, sizeof(arg->ca32_svc)) ||
  1787. get_user(karg->ca_version, &arg->ca32_version) ||
  1788. __get_user(karg->ca_svc.svc_port, &arg->ca32_svc.svc32_port) ||
  1789. __get_user(karg->ca_svc.svc_nthreads,
  1790. &arg->ca32_svc.svc32_nthreads))
  1791. return -EFAULT;
  1792. return 0;
  1793. }
  1794. static int compat_nfs_clnt_trans(struct nfsctl_arg *karg,
  1795. struct compat_nfsctl_arg __user *arg)
  1796. {
  1797. if (!access_ok(VERIFY_READ, &arg->ca32_client,
  1798. sizeof(arg->ca32_client)) ||
  1799. get_user(karg->ca_version, &arg->ca32_version) ||
  1800. __copy_from_user(&karg->ca_client.cl_ident[0],
  1801. &arg->ca32_client.cl32_ident[0],
  1802. NFSCLNT_IDMAX) ||
  1803. __get_user(karg->ca_client.cl_naddr,
  1804. &arg->ca32_client.cl32_naddr) ||
  1805. __copy_from_user(&karg->ca_client.cl_addrlist[0],
  1806. &arg->ca32_client.cl32_addrlist[0],
  1807. (sizeof(struct in_addr) * NFSCLNT_ADDRMAX)) ||
  1808. __get_user(karg->ca_client.cl_fhkeytype,
  1809. &arg->ca32_client.cl32_fhkeytype) ||
  1810. __get_user(karg->ca_client.cl_fhkeylen,
  1811. &arg->ca32_client.cl32_fhkeylen) ||
  1812. __copy_from_user(&karg->ca_client.cl_fhkey[0],
  1813. &arg->ca32_client.cl32_fhkey[0],
  1814. NFSCLNT_KEYMAX))
  1815. return -EFAULT;
  1816. return 0;
  1817. }
  1818. static int compat_nfs_exp_trans(struct nfsctl_arg *karg,
  1819. struct compat_nfsctl_arg __user *arg)
  1820. {
  1821. if (!access_ok(VERIFY_READ, &arg->ca32_export,
  1822. sizeof(arg->ca32_export)) ||
  1823. get_user(karg->ca_version, &arg->ca32_version) ||
  1824. __copy_from_user(&karg->ca_export.ex_client[0],
  1825. &arg->ca32_export.ex32_client[0],
  1826. NFSCLNT_IDMAX) ||
  1827. __copy_from_user(&karg->ca_export.ex_path[0],
  1828. &arg->ca32_export.ex32_path[0],
  1829. NFS_MAXPATHLEN) ||
  1830. __get_user(karg->ca_export.ex_dev,
  1831. &arg->ca32_export.ex32_dev) ||
  1832. __get_user(karg->ca_export.ex_ino,
  1833. &arg->ca32_export.ex32_ino) ||
  1834. __get_user(karg->ca_export.ex_flags,
  1835. &arg->ca32_export.ex32_flags) ||
  1836. __get_user(karg->ca_export.ex_anon_uid,
  1837. &arg->ca32_export.ex32_anon_uid) ||
  1838. __get_user(karg->ca_export.ex_anon_gid,
  1839. &arg->ca32_export.ex32_anon_gid))
  1840. return -EFAULT;
  1841. SET_UID(karg->ca_export.ex_anon_uid, karg->ca_export.ex_anon_uid);
  1842. SET_GID(karg->ca_export.ex_anon_gid, karg->ca_export.ex_anon_gid);
  1843. return 0;
  1844. }
  1845. static int compat_nfs_getfd_trans(struct nfsctl_arg *karg,
  1846. struct compat_nfsctl_arg __user *arg)
  1847. {
  1848. if (!access_ok(VERIFY_READ, &arg->ca32_getfd,
  1849. sizeof(arg->ca32_getfd)) ||
  1850. get_user(karg->ca_version, &arg->ca32_version) ||
  1851. __copy_from_user(&karg->ca_getfd.gd_addr,
  1852. &arg->ca32_getfd.gd32_addr,
  1853. (sizeof(struct sockaddr))) ||
  1854. __copy_from_user(&karg->ca_getfd.gd_path,
  1855. &arg->ca32_getfd.gd32_path,
  1856. (NFS_MAXPATHLEN+1)) ||
  1857. __get_user(karg->ca_getfd.gd_version,
  1858. &arg->ca32_getfd.gd32_version))
  1859. return -EFAULT;
  1860. return 0;
  1861. }
  1862. static int compat_nfs_getfs_trans(struct nfsctl_arg *karg,
  1863. struct compat_nfsctl_arg __user *arg)
  1864. {
  1865. if (!access_ok(VERIFY_READ,&arg->ca32_getfs,sizeof(arg->ca32_getfs)) ||
  1866. get_user(karg->ca_version, &arg->ca32_version) ||
  1867. __copy_from_user(&karg->ca_getfs.gd_addr,
  1868. &arg->ca32_getfs.gd32_addr,
  1869. (sizeof(struct sockaddr))) ||
  1870. __copy_from_user(&karg->ca_getfs.gd_path,
  1871. &arg->ca32_getfs.gd32_path,
  1872. (NFS_MAXPATHLEN+1)) ||
  1873. __get_user(karg->ca_getfs.gd_maxlen,
  1874. &arg->ca32_getfs.gd32_maxlen))
  1875. return -EFAULT;
  1876. return 0;
  1877. }
  1878. /* This really doesn't need translations, we are only passing
  1879. * back a union which contains opaque nfs file handle data.
  1880. */
  1881. static int compat_nfs_getfh_res_trans(union nfsctl_res *kres,
  1882. union compat_nfsctl_res __user *res)
  1883. {
  1884. int err;
  1885. err = copy_to_user(res, kres, sizeof(*res));
  1886. return (err) ? -EFAULT : 0;
  1887. }
  1888. asmlinkage long compat_sys_nfsservctl(int cmd,
  1889. struct compat_nfsctl_arg __user *arg,
  1890. union compat_nfsctl_res __user *res)
  1891. {
  1892. struct nfsctl_arg *karg;
  1893. union nfsctl_res *kres;
  1894. mm_segment_t oldfs;
  1895. int err;
  1896. karg = kmalloc(sizeof(*karg), GFP_USER);
  1897. kres = kmalloc(sizeof(*kres), GFP_USER);
  1898. if(!karg || !kres) {
  1899. err = -ENOMEM;
  1900. goto done;
  1901. }
  1902. switch(cmd) {
  1903. case NFSCTL_SVC:
  1904. err = compat_nfs_svc_trans(karg, arg);
  1905. break;
  1906. case NFSCTL_ADDCLIENT:
  1907. err = compat_nfs_clnt_trans(karg, arg);
  1908. break;
  1909. case NFSCTL_DELCLIENT:
  1910. err = compat_nfs_clnt_trans(karg, arg);
  1911. break;
  1912. case NFSCTL_EXPORT:
  1913. case NFSCTL_UNEXPORT:
  1914. err = compat_nfs_exp_trans(karg, arg);
  1915. break;
  1916. case NFSCTL_GETFD:
  1917. err = compat_nfs_getfd_trans(karg, arg);
  1918. break;
  1919. case NFSCTL_GETFS:
  1920. err = compat_nfs_getfs_trans(karg, arg);
  1921. break;
  1922. default:
  1923. err = -EINVAL;
  1924. break;
  1925. }
  1926. if (err)
  1927. goto done;
  1928. oldfs = get_fs();
  1929. set_fs(KERNEL_DS);
  1930. /* The __user pointer casts are valid because of the set_fs() */
  1931. err = sys_nfsservctl(cmd, (void __user *) karg, (void __user *) kres);
  1932. set_fs(oldfs);
  1933. if (err)
  1934. goto done;
  1935. if((cmd == NFSCTL_GETFD) ||
  1936. (cmd == NFSCTL_GETFS))
  1937. err = compat_nfs_getfh_res_trans(kres, res);
  1938. done:
  1939. kfree(karg);
  1940. kfree(kres);
  1941. return err;
  1942. }
  1943. #else /* !NFSD */
  1944. long asmlinkage compat_sys_nfsservctl(int cmd, void *notused, void *notused2)
  1945. {
  1946. return sys_ni_syscall();
  1947. }
  1948. #endif
  1949. #ifdef CONFIG_EPOLL
  1950. #ifdef CONFIG_HAS_COMPAT_EPOLL_EVENT
  1951. asmlinkage long compat_sys_epoll_ctl(int epfd, int op, int fd,
  1952. struct compat_epoll_event __user *event)
  1953. {
  1954. long err = 0;
  1955. struct compat_epoll_event user;
  1956. struct epoll_event __user *kernel = NULL;
  1957. if (event) {
  1958. if (copy_from_user(&user, event, sizeof(user)))
  1959. return -EFAULT;
  1960. kernel = compat_alloc_user_space(sizeof(struct epoll_event));
  1961. err |= __put_user(user.events, &kernel->events);
  1962. err |= __put_user(user.data, &kernel->data);
  1963. }
  1964. return err ? err : sys_epoll_ctl(epfd, op, fd, kernel);
  1965. }
  1966. asmlinkage long compat_sys_epoll_wait(int epfd,
  1967. struct compat_epoll_event __user *events,
  1968. int maxevents, int timeout)
  1969. {
  1970. long i, ret, err = 0;
  1971. struct epoll_event __user *kbuf;
  1972. struct epoll_event ev;
  1973. if ((maxevents <= 0) ||
  1974. (maxevents > (INT_MAX / sizeof(struct epoll_event))))
  1975. return -EINVAL;
  1976. kbuf = compat_alloc_user_space(sizeof(struct epoll_event) * maxevents);
  1977. ret = sys_epoll_wait(epfd, kbuf, maxevents, timeout);
  1978. for (i = 0; i < ret; i++) {
  1979. err |= __get_user(ev.events, &kbuf[i].events);
  1980. err |= __get_user(ev.data, &kbuf[i].data);
  1981. err |= __put_user(ev.events, &events->events);
  1982. err |= __put_user_unaligned(ev.data, &events->data);
  1983. events++;
  1984. }
  1985. return err ? -EFAULT: ret;
  1986. }
  1987. #endif /* CONFIG_HAS_COMPAT_EPOLL_EVENT */
  1988. #ifdef TIF_RESTORE_SIGMASK
  1989. asmlinkage long compat_sys_epoll_pwait(int epfd,
  1990. struct compat_epoll_event __user *events,
  1991. int maxevents, int timeout,
  1992. const compat_sigset_t __user *sigmask,
  1993. compat_size_t sigsetsize)
  1994. {
  1995. long err;
  1996. compat_sigset_t csigmask;
  1997. sigset_t ksigmask, sigsaved;
  1998. /*
  1999. * If the caller wants a certain signal mask to be set during the wait,
  2000. * we apply it here.
  2001. */
  2002. if (sigmask) {
  2003. if (sigsetsize != sizeof(compat_sigset_t))
  2004. return -EINVAL;
  2005. if (copy_from_user(&csigmask, sigmask, sizeof(csigmask)))
  2006. return -EFAULT;
  2007. sigset_from_compat(&ksigmask, &csigmask);
  2008. sigdelsetmask(&ksigmask, sigmask(SIGKILL) | sigmask(SIGSTOP));
  2009. sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
  2010. }
  2011. #ifdef CONFIG_HAS_COMPAT_EPOLL_EVENT
  2012. err = compat_sys_epoll_wait(epfd, events, maxevents, timeout);
  2013. #else
  2014. err = sys_epoll_wait(epfd, events, maxevents, timeout);
  2015. #endif
  2016. /*
  2017. * If we changed the signal mask, we need to restore the original one.
  2018. * In case we've got a signal while waiting, we do not restore the
  2019. * signal mask yet, and we allow do_signal() to deliver the signal on
  2020. * the way back to userspace, before the signal mask is restored.
  2021. */
  2022. if (sigmask) {
  2023. if (err == -EINTR) {
  2024. memcpy(&current->saved_sigmask, &sigsaved,
  2025. sizeof(sigsaved));
  2026. set_thread_flag(TIF_RESTORE_SIGMASK);
  2027. } else
  2028. sigprocmask(SIG_SETMASK, &sigsaved, NULL);
  2029. }
  2030. return err;
  2031. }
  2032. #endif /* TIF_RESTORE_SIGMASK */
  2033. #endif /* CONFIG_EPOLL */