Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Milind Arun Choudhary | 022a169 | 2007-05-08 00:29:02 -0700 | [diff] [blame] | 18 | #include <linux/kernel.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 19 | #include <linux/linkage.h> |
| 20 | #include <linux/compat.h> |
| 21 | #include <linux/errno.h> |
| 22 | #include <linux/time.h> |
| 23 | #include <linux/fs.h> |
| 24 | #include <linux/fcntl.h> |
| 25 | #include <linux/namei.h> |
| 26 | #include <linux/file.h> |
| 27 | #include <linux/vfs.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 28 | #include <linux/ioctl.h> |
| 29 | #include <linux/init.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 30 | #include <linux/smb.h> |
| 31 | #include <linux/smb_mount.h> |
| 32 | #include <linux/ncp_mount.h> |
David Howells | 9a9947b | 2005-04-18 10:54:51 -0700 | [diff] [blame] | 33 | #include <linux/nfs4_mount.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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> |
Robert Love | 0eeca28 | 2005-07-12 17:06:03 -0400 | [diff] [blame] | 39 | #include <linux/fsnotify.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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> |
Jay Lan | 8f0ab51 | 2006-09-30 23:28:59 -0700 | [diff] [blame] | 46 | #include <linux/tsacct_kern.h> |
Christoph Hellwig | 6272e26 | 2007-05-08 00:29:21 -0700 | [diff] [blame^] | 47 | #include <linux/security.h> |
Al Viro | a1f8e7f | 2006-10-19 16:08:53 -0400 | [diff] [blame] | 48 | #include <linux/highmem.h> |
Al Viro | bd01f84 | 2006-10-19 17:23:57 -0400 | [diff] [blame] | 49 | #include <linux/poll.h> |
David S. Miller | 4a805e8 | 2005-09-14 21:40:00 -0700 | [diff] [blame] | 50 | #include <linux/mm.h> |
Davide Libenzi | f6dfb4f | 2007-03-07 20:41:21 -0800 | [diff] [blame] | 51 | #include <linux/eventpoll.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 52 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 53 | #include <asm/uaccess.h> |
| 54 | #include <asm/mmu_context.h> |
| 55 | #include <asm/ioctls.h> |
David Howells | 07f3f05 | 2006-09-30 20:52:18 +0200 | [diff] [blame] | 56 | #include "internal.h" |
David Woodhouse | 9f72949 | 2006-01-18 17:44:05 -0800 | [diff] [blame] | 57 | |
Andi Kleen | bebfa10 | 2006-06-26 13:56:52 +0200 | [diff] [blame] | 58 | int compat_log = 1; |
| 59 | |
| 60 | int compat_printk(const char *fmt, ...) |
| 61 | { |
| 62 | va_list ap; |
| 63 | int ret; |
| 64 | if (!compat_log) |
| 65 | return 0; |
| 66 | va_start(ap, fmt); |
| 67 | ret = vprintk(fmt, ap); |
| 68 | va_end(ap); |
| 69 | return ret; |
| 70 | } |
| 71 | |
Badari Pulavarty | ee0b3e6 | 2006-09-30 23:28:47 -0700 | [diff] [blame] | 72 | #include "read_write.h" |
| 73 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 74 | /* |
| 75 | * Not all architectures have sys_utime, so implement this in terms |
| 76 | * of sys_utimes. |
| 77 | */ |
| 78 | asmlinkage long compat_sys_utime(char __user *filename, struct compat_utimbuf __user *t) |
| 79 | { |
| 80 | struct timeval tv[2]; |
| 81 | |
| 82 | if (t) { |
| 83 | if (get_user(tv[0].tv_sec, &t->actime) || |
| 84 | get_user(tv[1].tv_sec, &t->modtime)) |
| 85 | return -EFAULT; |
| 86 | tv[0].tv_usec = 0; |
| 87 | tv[1].tv_usec = 0; |
| 88 | } |
Ulrich Drepper | 5590ff0 | 2006-01-18 17:43:53 -0800 | [diff] [blame] | 89 | return do_utimes(AT_FDCWD, filename, t ? tv : NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 90 | } |
| 91 | |
Stephen Rothwell | 9ad11ab | 2006-02-02 16:11:51 +1100 | [diff] [blame] | 92 | asmlinkage long compat_sys_futimesat(unsigned int dfd, char __user *filename, struct compat_timeval __user *t) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 93 | { |
| 94 | struct timeval tv[2]; |
| 95 | |
Stephen Rothwell | 9ad11ab | 2006-02-02 16:11:51 +1100 | [diff] [blame] | 96 | if (t) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 97 | if (get_user(tv[0].tv_sec, &t[0].tv_sec) || |
| 98 | get_user(tv[0].tv_usec, &t[0].tv_usec) || |
| 99 | get_user(tv[1].tv_sec, &t[1].tv_sec) || |
| 100 | get_user(tv[1].tv_usec, &t[1].tv_usec)) |
Stephen Rothwell | 9ad11ab | 2006-02-02 16:11:51 +1100 | [diff] [blame] | 101 | return -EFAULT; |
| 102 | } |
Ulrich Drepper | 5590ff0 | 2006-01-18 17:43:53 -0800 | [diff] [blame] | 103 | return do_utimes(dfd, filename, t ? tv : NULL); |
| 104 | } |
| 105 | |
| 106 | asmlinkage long compat_sys_utimes(char __user *filename, struct compat_timeval __user *t) |
| 107 | { |
| 108 | return compat_sys_futimesat(AT_FDCWD, filename, t); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 109 | } |
| 110 | |
| 111 | asmlinkage long compat_sys_newstat(char __user * filename, |
| 112 | struct compat_stat __user *statbuf) |
| 113 | { |
| 114 | struct kstat stat; |
Ulrich Drepper | 5590ff0 | 2006-01-18 17:43:53 -0800 | [diff] [blame] | 115 | int error = vfs_stat_fd(AT_FDCWD, filename, &stat); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 116 | |
| 117 | if (!error) |
| 118 | error = cp_compat_stat(&stat, statbuf); |
| 119 | return error; |
| 120 | } |
| 121 | |
| 122 | asmlinkage long compat_sys_newlstat(char __user * filename, |
| 123 | struct compat_stat __user *statbuf) |
| 124 | { |
| 125 | struct kstat stat; |
Ulrich Drepper | 5590ff0 | 2006-01-18 17:43:53 -0800 | [diff] [blame] | 126 | int error = vfs_lstat_fd(AT_FDCWD, filename, &stat); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 127 | |
| 128 | if (!error) |
| 129 | error = cp_compat_stat(&stat, statbuf); |
| 130 | return error; |
| 131 | } |
| 132 | |
Kyle McMartin | 82d821d | 2006-03-24 03:18:20 -0800 | [diff] [blame] | 133 | #ifndef __ARCH_WANT_STAT64 |
Stephen Rothwell | 9ad11ab | 2006-02-02 16:11:51 +1100 | [diff] [blame] | 134 | asmlinkage long compat_sys_newfstatat(unsigned int dfd, char __user *filename, |
Ulrich Drepper | 5590ff0 | 2006-01-18 17:43:53 -0800 | [diff] [blame] | 135 | struct compat_stat __user *statbuf, int flag) |
| 136 | { |
| 137 | struct kstat stat; |
| 138 | int error = -EINVAL; |
| 139 | |
| 140 | if ((flag & ~AT_SYMLINK_NOFOLLOW) != 0) |
| 141 | goto out; |
| 142 | |
| 143 | if (flag & AT_SYMLINK_NOFOLLOW) |
| 144 | error = vfs_lstat_fd(dfd, filename, &stat); |
| 145 | else |
| 146 | error = vfs_stat_fd(dfd, filename, &stat); |
| 147 | |
| 148 | if (!error) |
| 149 | error = cp_compat_stat(&stat, statbuf); |
| 150 | |
| 151 | out: |
| 152 | return error; |
| 153 | } |
Kyle McMartin | 82d821d | 2006-03-24 03:18:20 -0800 | [diff] [blame] | 154 | #endif |
Ulrich Drepper | 5590ff0 | 2006-01-18 17:43:53 -0800 | [diff] [blame] | 155 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 156 | asmlinkage long compat_sys_newfstat(unsigned int fd, |
| 157 | struct compat_stat __user * statbuf) |
| 158 | { |
| 159 | struct kstat stat; |
| 160 | int error = vfs_fstat(fd, &stat); |
| 161 | |
| 162 | if (!error) |
| 163 | error = cp_compat_stat(&stat, statbuf); |
| 164 | return error; |
| 165 | } |
| 166 | |
| 167 | static int put_compat_statfs(struct compat_statfs __user *ubuf, struct kstatfs *kbuf) |
| 168 | { |
| 169 | |
| 170 | if (sizeof ubuf->f_blocks == 4) { |
| 171 | if ((kbuf->f_blocks | kbuf->f_bfree | kbuf->f_bavail) & |
| 172 | 0xffffffff00000000ULL) |
| 173 | return -EOVERFLOW; |
| 174 | /* f_files and f_ffree may be -1; it's okay |
| 175 | * to stuff that into 32 bits */ |
| 176 | if (kbuf->f_files != 0xffffffffffffffffULL |
| 177 | && (kbuf->f_files & 0xffffffff00000000ULL)) |
| 178 | return -EOVERFLOW; |
| 179 | if (kbuf->f_ffree != 0xffffffffffffffffULL |
| 180 | && (kbuf->f_ffree & 0xffffffff00000000ULL)) |
| 181 | return -EOVERFLOW; |
| 182 | } |
| 183 | if (!access_ok(VERIFY_WRITE, ubuf, sizeof(*ubuf)) || |
| 184 | __put_user(kbuf->f_type, &ubuf->f_type) || |
| 185 | __put_user(kbuf->f_bsize, &ubuf->f_bsize) || |
| 186 | __put_user(kbuf->f_blocks, &ubuf->f_blocks) || |
| 187 | __put_user(kbuf->f_bfree, &ubuf->f_bfree) || |
| 188 | __put_user(kbuf->f_bavail, &ubuf->f_bavail) || |
| 189 | __put_user(kbuf->f_files, &ubuf->f_files) || |
| 190 | __put_user(kbuf->f_ffree, &ubuf->f_ffree) || |
| 191 | __put_user(kbuf->f_namelen, &ubuf->f_namelen) || |
| 192 | __put_user(kbuf->f_fsid.val[0], &ubuf->f_fsid.val[0]) || |
| 193 | __put_user(kbuf->f_fsid.val[1], &ubuf->f_fsid.val[1]) || |
| 194 | __put_user(kbuf->f_frsize, &ubuf->f_frsize) || |
| 195 | __put_user(0, &ubuf->f_spare[0]) || |
| 196 | __put_user(0, &ubuf->f_spare[1]) || |
| 197 | __put_user(0, &ubuf->f_spare[2]) || |
| 198 | __put_user(0, &ubuf->f_spare[3]) || |
| 199 | __put_user(0, &ubuf->f_spare[4])) |
| 200 | return -EFAULT; |
| 201 | return 0; |
| 202 | } |
| 203 | |
| 204 | /* |
| 205 | * The following statfs calls are copies of code from fs/open.c and |
| 206 | * should be checked against those from time to time |
| 207 | */ |
| 208 | asmlinkage long compat_sys_statfs(const char __user *path, struct compat_statfs __user *buf) |
| 209 | { |
| 210 | struct nameidata nd; |
| 211 | int error; |
| 212 | |
| 213 | error = user_path_walk(path, &nd); |
| 214 | if (!error) { |
| 215 | struct kstatfs tmp; |
David Howells | 726c334 | 2006-06-23 02:02:58 -0700 | [diff] [blame] | 216 | error = vfs_statfs(nd.dentry, &tmp); |
David Gibson | 86e07ce | 2005-11-21 21:32:23 -0800 | [diff] [blame] | 217 | if (!error) |
| 218 | error = put_compat_statfs(buf, &tmp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 219 | path_release(&nd); |
| 220 | } |
| 221 | return error; |
| 222 | } |
| 223 | |
| 224 | asmlinkage long compat_sys_fstatfs(unsigned int fd, struct compat_statfs __user *buf) |
| 225 | { |
| 226 | struct file * file; |
| 227 | struct kstatfs tmp; |
| 228 | int error; |
| 229 | |
| 230 | error = -EBADF; |
| 231 | file = fget(fd); |
| 232 | if (!file) |
| 233 | goto out; |
Josef "Jeff" Sipek | 0f7fc9e | 2006-12-08 02:36:35 -0800 | [diff] [blame] | 234 | error = vfs_statfs(file->f_path.dentry, &tmp); |
David Gibson | 86e07ce | 2005-11-21 21:32:23 -0800 | [diff] [blame] | 235 | if (!error) |
| 236 | error = put_compat_statfs(buf, &tmp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 237 | fput(file); |
| 238 | out: |
| 239 | return error; |
| 240 | } |
| 241 | |
| 242 | static int put_compat_statfs64(struct compat_statfs64 __user *ubuf, struct kstatfs *kbuf) |
| 243 | { |
| 244 | if (sizeof ubuf->f_blocks == 4) { |
| 245 | if ((kbuf->f_blocks | kbuf->f_bfree | kbuf->f_bavail) & |
| 246 | 0xffffffff00000000ULL) |
| 247 | return -EOVERFLOW; |
| 248 | /* f_files and f_ffree may be -1; it's okay |
| 249 | * to stuff that into 32 bits */ |
| 250 | if (kbuf->f_files != 0xffffffffffffffffULL |
| 251 | && (kbuf->f_files & 0xffffffff00000000ULL)) |
| 252 | return -EOVERFLOW; |
| 253 | if (kbuf->f_ffree != 0xffffffffffffffffULL |
| 254 | && (kbuf->f_ffree & 0xffffffff00000000ULL)) |
| 255 | return -EOVERFLOW; |
| 256 | } |
| 257 | if (!access_ok(VERIFY_WRITE, ubuf, sizeof(*ubuf)) || |
| 258 | __put_user(kbuf->f_type, &ubuf->f_type) || |
| 259 | __put_user(kbuf->f_bsize, &ubuf->f_bsize) || |
| 260 | __put_user(kbuf->f_blocks, &ubuf->f_blocks) || |
| 261 | __put_user(kbuf->f_bfree, &ubuf->f_bfree) || |
| 262 | __put_user(kbuf->f_bavail, &ubuf->f_bavail) || |
| 263 | __put_user(kbuf->f_files, &ubuf->f_files) || |
| 264 | __put_user(kbuf->f_ffree, &ubuf->f_ffree) || |
| 265 | __put_user(kbuf->f_namelen, &ubuf->f_namelen) || |
| 266 | __put_user(kbuf->f_fsid.val[0], &ubuf->f_fsid.val[0]) || |
| 267 | __put_user(kbuf->f_fsid.val[1], &ubuf->f_fsid.val[1]) || |
| 268 | __put_user(kbuf->f_frsize, &ubuf->f_frsize)) |
| 269 | return -EFAULT; |
| 270 | return 0; |
| 271 | } |
| 272 | |
| 273 | asmlinkage long compat_sys_statfs64(const char __user *path, compat_size_t sz, struct compat_statfs64 __user *buf) |
| 274 | { |
| 275 | struct nameidata nd; |
| 276 | int error; |
| 277 | |
| 278 | if (sz != sizeof(*buf)) |
| 279 | return -EINVAL; |
| 280 | |
| 281 | error = user_path_walk(path, &nd); |
| 282 | if (!error) { |
| 283 | struct kstatfs tmp; |
David Howells | 726c334 | 2006-06-23 02:02:58 -0700 | [diff] [blame] | 284 | error = vfs_statfs(nd.dentry, &tmp); |
David Gibson | 86e07ce | 2005-11-21 21:32:23 -0800 | [diff] [blame] | 285 | if (!error) |
| 286 | error = put_compat_statfs64(buf, &tmp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 287 | path_release(&nd); |
| 288 | } |
| 289 | return error; |
| 290 | } |
| 291 | |
| 292 | asmlinkage long compat_sys_fstatfs64(unsigned int fd, compat_size_t sz, struct compat_statfs64 __user *buf) |
| 293 | { |
| 294 | struct file * file; |
| 295 | struct kstatfs tmp; |
| 296 | int error; |
| 297 | |
| 298 | if (sz != sizeof(*buf)) |
| 299 | return -EINVAL; |
| 300 | |
| 301 | error = -EBADF; |
| 302 | file = fget(fd); |
| 303 | if (!file) |
| 304 | goto out; |
Josef "Jeff" Sipek | 0f7fc9e | 2006-12-08 02:36:35 -0800 | [diff] [blame] | 305 | error = vfs_statfs(file->f_path.dentry, &tmp); |
David Gibson | 86e07ce | 2005-11-21 21:32:23 -0800 | [diff] [blame] | 306 | if (!error) |
| 307 | error = put_compat_statfs64(buf, &tmp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 308 | fput(file); |
| 309 | out: |
| 310 | return error; |
| 311 | } |
| 312 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 313 | static int get_compat_flock(struct flock *kfl, struct compat_flock __user *ufl) |
| 314 | { |
| 315 | if (!access_ok(VERIFY_READ, ufl, sizeof(*ufl)) || |
| 316 | __get_user(kfl->l_type, &ufl->l_type) || |
| 317 | __get_user(kfl->l_whence, &ufl->l_whence) || |
| 318 | __get_user(kfl->l_start, &ufl->l_start) || |
| 319 | __get_user(kfl->l_len, &ufl->l_len) || |
| 320 | __get_user(kfl->l_pid, &ufl->l_pid)) |
| 321 | return -EFAULT; |
| 322 | return 0; |
| 323 | } |
| 324 | |
| 325 | static int put_compat_flock(struct flock *kfl, struct compat_flock __user *ufl) |
| 326 | { |
| 327 | if (!access_ok(VERIFY_WRITE, ufl, sizeof(*ufl)) || |
| 328 | __put_user(kfl->l_type, &ufl->l_type) || |
| 329 | __put_user(kfl->l_whence, &ufl->l_whence) || |
| 330 | __put_user(kfl->l_start, &ufl->l_start) || |
| 331 | __put_user(kfl->l_len, &ufl->l_len) || |
| 332 | __put_user(kfl->l_pid, &ufl->l_pid)) |
| 333 | return -EFAULT; |
| 334 | return 0; |
| 335 | } |
| 336 | |
| 337 | #ifndef HAVE_ARCH_GET_COMPAT_FLOCK64 |
| 338 | static int get_compat_flock64(struct flock *kfl, struct compat_flock64 __user *ufl) |
| 339 | { |
| 340 | if (!access_ok(VERIFY_READ, ufl, sizeof(*ufl)) || |
| 341 | __get_user(kfl->l_type, &ufl->l_type) || |
| 342 | __get_user(kfl->l_whence, &ufl->l_whence) || |
| 343 | __get_user(kfl->l_start, &ufl->l_start) || |
| 344 | __get_user(kfl->l_len, &ufl->l_len) || |
| 345 | __get_user(kfl->l_pid, &ufl->l_pid)) |
| 346 | return -EFAULT; |
| 347 | return 0; |
| 348 | } |
| 349 | #endif |
| 350 | |
| 351 | #ifndef HAVE_ARCH_PUT_COMPAT_FLOCK64 |
| 352 | static int put_compat_flock64(struct flock *kfl, struct compat_flock64 __user *ufl) |
| 353 | { |
| 354 | if (!access_ok(VERIFY_WRITE, ufl, sizeof(*ufl)) || |
| 355 | __put_user(kfl->l_type, &ufl->l_type) || |
| 356 | __put_user(kfl->l_whence, &ufl->l_whence) || |
| 357 | __put_user(kfl->l_start, &ufl->l_start) || |
| 358 | __put_user(kfl->l_len, &ufl->l_len) || |
| 359 | __put_user(kfl->l_pid, &ufl->l_pid)) |
| 360 | return -EFAULT; |
| 361 | return 0; |
| 362 | } |
| 363 | #endif |
| 364 | |
| 365 | asmlinkage long compat_sys_fcntl64(unsigned int fd, unsigned int cmd, |
| 366 | unsigned long arg) |
| 367 | { |
| 368 | mm_segment_t old_fs; |
| 369 | struct flock f; |
| 370 | long ret; |
| 371 | |
| 372 | switch (cmd) { |
| 373 | case F_GETLK: |
| 374 | case F_SETLK: |
| 375 | case F_SETLKW: |
| 376 | ret = get_compat_flock(&f, compat_ptr(arg)); |
| 377 | if (ret != 0) |
| 378 | break; |
| 379 | old_fs = get_fs(); |
| 380 | set_fs(KERNEL_DS); |
| 381 | ret = sys_fcntl(fd, cmd, (unsigned long)&f); |
| 382 | set_fs(old_fs); |
| 383 | if (cmd == F_GETLK && ret == 0) { |
NeilBrown | 2520f14 | 2006-01-08 01:02:40 -0800 | [diff] [blame] | 384 | /* GETLK was successfule and we need to return the data... |
| 385 | * but it needs to fit in the compat structure. |
| 386 | * l_start shouldn't be too big, unless the original |
| 387 | * start + end is greater than COMPAT_OFF_T_MAX, in which |
| 388 | * case the app was asking for trouble, so we return |
| 389 | * -EOVERFLOW in that case. |
| 390 | * l_len could be too big, in which case we just truncate it, |
| 391 | * and only allow the app to see that part of the conflicting |
| 392 | * lock that might make sense to it anyway |
| 393 | */ |
| 394 | |
| 395 | if (f.l_start > COMPAT_OFF_T_MAX) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 396 | ret = -EOVERFLOW; |
NeilBrown | 2520f14 | 2006-01-08 01:02:40 -0800 | [diff] [blame] | 397 | if (f.l_len > COMPAT_OFF_T_MAX) |
| 398 | f.l_len = COMPAT_OFF_T_MAX; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 399 | if (ret == 0) |
| 400 | ret = put_compat_flock(&f, compat_ptr(arg)); |
| 401 | } |
| 402 | break; |
| 403 | |
| 404 | case F_GETLK64: |
| 405 | case F_SETLK64: |
| 406 | case F_SETLKW64: |
| 407 | ret = get_compat_flock64(&f, compat_ptr(arg)); |
| 408 | if (ret != 0) |
| 409 | break; |
| 410 | old_fs = get_fs(); |
| 411 | set_fs(KERNEL_DS); |
| 412 | ret = sys_fcntl(fd, (cmd == F_GETLK64) ? F_GETLK : |
| 413 | ((cmd == F_SETLK64) ? F_SETLK : F_SETLKW), |
| 414 | (unsigned long)&f); |
| 415 | set_fs(old_fs); |
| 416 | if (cmd == F_GETLK64 && ret == 0) { |
NeilBrown | 2520f14 | 2006-01-08 01:02:40 -0800 | [diff] [blame] | 417 | /* need to return lock information - see above for commentary */ |
| 418 | if (f.l_start > COMPAT_LOFF_T_MAX) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 419 | ret = -EOVERFLOW; |
NeilBrown | 2520f14 | 2006-01-08 01:02:40 -0800 | [diff] [blame] | 420 | if (f.l_len > COMPAT_LOFF_T_MAX) |
| 421 | f.l_len = COMPAT_LOFF_T_MAX; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 422 | if (ret == 0) |
| 423 | ret = put_compat_flock64(&f, compat_ptr(arg)); |
| 424 | } |
| 425 | break; |
| 426 | |
| 427 | default: |
| 428 | ret = sys_fcntl(fd, cmd, arg); |
| 429 | break; |
| 430 | } |
| 431 | return ret; |
| 432 | } |
| 433 | |
| 434 | asmlinkage long compat_sys_fcntl(unsigned int fd, unsigned int cmd, |
| 435 | unsigned long arg) |
| 436 | { |
| 437 | if ((cmd == F_GETLK64) || (cmd == F_SETLK64) || (cmd == F_SETLKW64)) |
| 438 | return -EINVAL; |
| 439 | return compat_sys_fcntl64(fd, cmd, arg); |
| 440 | } |
| 441 | |
| 442 | asmlinkage long |
| 443 | compat_sys_io_setup(unsigned nr_reqs, u32 __user *ctx32p) |
| 444 | { |
| 445 | long ret; |
| 446 | aio_context_t ctx64; |
| 447 | |
| 448 | mm_segment_t oldfs = get_fs(); |
| 449 | if (unlikely(get_user(ctx64, ctx32p))) |
| 450 | return -EFAULT; |
| 451 | |
| 452 | set_fs(KERNEL_DS); |
| 453 | /* The __user pointer cast is valid because of the set_fs() */ |
| 454 | ret = sys_io_setup(nr_reqs, (aio_context_t __user *) &ctx64); |
| 455 | set_fs(oldfs); |
| 456 | /* truncating is ok because it's a user address */ |
| 457 | if (!ret) |
| 458 | ret = put_user((u32) ctx64, ctx32p); |
| 459 | return ret; |
| 460 | } |
| 461 | |
| 462 | asmlinkage long |
| 463 | compat_sys_io_getevents(aio_context_t ctx_id, |
| 464 | unsigned long min_nr, |
| 465 | unsigned long nr, |
| 466 | struct io_event __user *events, |
| 467 | struct compat_timespec __user *timeout) |
| 468 | { |
| 469 | long ret; |
| 470 | struct timespec t; |
| 471 | struct timespec __user *ut = NULL; |
| 472 | |
| 473 | ret = -EFAULT; |
| 474 | if (unlikely(!access_ok(VERIFY_WRITE, events, |
| 475 | nr * sizeof(struct io_event)))) |
| 476 | goto out; |
| 477 | if (timeout) { |
| 478 | if (get_compat_timespec(&t, timeout)) |
| 479 | goto out; |
| 480 | |
| 481 | ut = compat_alloc_user_space(sizeof(*ut)); |
| 482 | if (copy_to_user(ut, &t, sizeof(t)) ) |
| 483 | goto out; |
| 484 | } |
| 485 | ret = sys_io_getevents(ctx_id, min_nr, nr, events, ut); |
| 486 | out: |
| 487 | return ret; |
| 488 | } |
| 489 | |
| 490 | static inline long |
| 491 | copy_iocb(long nr, u32 __user *ptr32, struct iocb __user * __user *ptr64) |
| 492 | { |
| 493 | compat_uptr_t uptr; |
| 494 | int i; |
| 495 | |
| 496 | for (i = 0; i < nr; ++i) { |
| 497 | if (get_user(uptr, ptr32 + i)) |
| 498 | return -EFAULT; |
| 499 | if (put_user(compat_ptr(uptr), ptr64 + i)) |
| 500 | return -EFAULT; |
| 501 | } |
| 502 | return 0; |
| 503 | } |
| 504 | |
| 505 | #define MAX_AIO_SUBMITS (PAGE_SIZE/sizeof(struct iocb *)) |
| 506 | |
| 507 | asmlinkage long |
| 508 | compat_sys_io_submit(aio_context_t ctx_id, int nr, u32 __user *iocb) |
| 509 | { |
| 510 | struct iocb __user * __user *iocb64; |
| 511 | long ret; |
| 512 | |
| 513 | if (unlikely(nr < 0)) |
| 514 | return -EINVAL; |
| 515 | |
| 516 | if (nr > MAX_AIO_SUBMITS) |
| 517 | nr = MAX_AIO_SUBMITS; |
| 518 | |
| 519 | iocb64 = compat_alloc_user_space(nr * sizeof(*iocb64)); |
| 520 | ret = copy_iocb(nr, iocb, iocb64); |
| 521 | if (!ret) |
| 522 | ret = sys_io_submit(ctx_id, nr, iocb64); |
| 523 | return ret; |
| 524 | } |
| 525 | |
| 526 | struct compat_ncp_mount_data { |
| 527 | compat_int_t version; |
| 528 | compat_uint_t ncp_fd; |
Stephen Rothwell | 202e597 | 2005-09-06 15:16:40 -0700 | [diff] [blame] | 529 | __compat_uid_t mounted_uid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 530 | compat_pid_t wdog_pid; |
| 531 | unsigned char mounted_vol[NCP_VOLNAME_LEN + 1]; |
| 532 | compat_uint_t time_out; |
| 533 | compat_uint_t retry_count; |
| 534 | compat_uint_t flags; |
Stephen Rothwell | 202e597 | 2005-09-06 15:16:40 -0700 | [diff] [blame] | 535 | __compat_uid_t uid; |
| 536 | __compat_gid_t gid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 537 | compat_mode_t file_mode; |
| 538 | compat_mode_t dir_mode; |
| 539 | }; |
| 540 | |
| 541 | struct compat_ncp_mount_data_v4 { |
| 542 | compat_int_t version; |
| 543 | compat_ulong_t flags; |
| 544 | compat_ulong_t mounted_uid; |
| 545 | compat_long_t wdog_pid; |
| 546 | compat_uint_t ncp_fd; |
| 547 | compat_uint_t time_out; |
| 548 | compat_uint_t retry_count; |
| 549 | compat_ulong_t uid; |
| 550 | compat_ulong_t gid; |
| 551 | compat_ulong_t file_mode; |
| 552 | compat_ulong_t dir_mode; |
| 553 | }; |
| 554 | |
| 555 | static void *do_ncp_super_data_conv(void *raw_data) |
| 556 | { |
| 557 | int version = *(unsigned int *)raw_data; |
| 558 | |
| 559 | if (version == 3) { |
| 560 | struct compat_ncp_mount_data *c_n = raw_data; |
| 561 | struct ncp_mount_data *n = raw_data; |
| 562 | |
| 563 | n->dir_mode = c_n->dir_mode; |
| 564 | n->file_mode = c_n->file_mode; |
| 565 | n->gid = c_n->gid; |
| 566 | n->uid = c_n->uid; |
| 567 | memmove (n->mounted_vol, c_n->mounted_vol, (sizeof (c_n->mounted_vol) + 3 * sizeof (unsigned int))); |
| 568 | n->wdog_pid = c_n->wdog_pid; |
| 569 | n->mounted_uid = c_n->mounted_uid; |
| 570 | } else if (version == 4) { |
| 571 | struct compat_ncp_mount_data_v4 *c_n = raw_data; |
| 572 | struct ncp_mount_data_v4 *n = raw_data; |
| 573 | |
| 574 | n->dir_mode = c_n->dir_mode; |
| 575 | n->file_mode = c_n->file_mode; |
| 576 | n->gid = c_n->gid; |
| 577 | n->uid = c_n->uid; |
| 578 | n->retry_count = c_n->retry_count; |
| 579 | n->time_out = c_n->time_out; |
| 580 | n->ncp_fd = c_n->ncp_fd; |
| 581 | n->wdog_pid = c_n->wdog_pid; |
| 582 | n->mounted_uid = c_n->mounted_uid; |
| 583 | n->flags = c_n->flags; |
| 584 | } else if (version != 5) { |
| 585 | return NULL; |
| 586 | } |
| 587 | |
| 588 | return raw_data; |
| 589 | } |
| 590 | |
| 591 | struct compat_smb_mount_data { |
| 592 | compat_int_t version; |
Stephen Rothwell | 202e597 | 2005-09-06 15:16:40 -0700 | [diff] [blame] | 593 | __compat_uid_t mounted_uid; |
| 594 | __compat_uid_t uid; |
| 595 | __compat_gid_t gid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 596 | compat_mode_t file_mode; |
| 597 | compat_mode_t dir_mode; |
| 598 | }; |
| 599 | |
| 600 | static void *do_smb_super_data_conv(void *raw_data) |
| 601 | { |
| 602 | struct smb_mount_data *s = raw_data; |
| 603 | struct compat_smb_mount_data *c_s = raw_data; |
| 604 | |
| 605 | if (c_s->version != SMB_MOUNT_OLDVERSION) |
| 606 | goto out; |
| 607 | s->dir_mode = c_s->dir_mode; |
| 608 | s->file_mode = c_s->file_mode; |
| 609 | s->gid = c_s->gid; |
| 610 | s->uid = c_s->uid; |
| 611 | s->mounted_uid = c_s->mounted_uid; |
| 612 | out: |
| 613 | return raw_data; |
| 614 | } |
| 615 | |
David Howells | 9a9947b | 2005-04-18 10:54:51 -0700 | [diff] [blame] | 616 | struct compat_nfs_string { |
| 617 | compat_uint_t len; |
David Howells | 5fc3e62 | 2005-04-27 15:39:03 -0700 | [diff] [blame] | 618 | compat_uptr_t data; |
David Howells | 9a9947b | 2005-04-18 10:54:51 -0700 | [diff] [blame] | 619 | }; |
| 620 | |
| 621 | static inline void compat_nfs_string(struct nfs_string *dst, |
| 622 | struct compat_nfs_string *src) |
| 623 | { |
| 624 | dst->data = compat_ptr(src->data); |
| 625 | dst->len = src->len; |
| 626 | } |
| 627 | |
| 628 | struct compat_nfs4_mount_data_v1 { |
| 629 | compat_int_t version; |
| 630 | compat_int_t flags; |
| 631 | compat_int_t rsize; |
| 632 | compat_int_t wsize; |
| 633 | compat_int_t timeo; |
| 634 | compat_int_t retrans; |
| 635 | compat_int_t acregmin; |
| 636 | compat_int_t acregmax; |
| 637 | compat_int_t acdirmin; |
| 638 | compat_int_t acdirmax; |
| 639 | struct compat_nfs_string client_addr; |
| 640 | struct compat_nfs_string mnt_path; |
| 641 | struct compat_nfs_string hostname; |
| 642 | compat_uint_t host_addrlen; |
David Howells | 5fc3e62 | 2005-04-27 15:39:03 -0700 | [diff] [blame] | 643 | compat_uptr_t host_addr; |
David Howells | 9a9947b | 2005-04-18 10:54:51 -0700 | [diff] [blame] | 644 | compat_int_t proto; |
| 645 | compat_int_t auth_flavourlen; |
David Howells | 5fc3e62 | 2005-04-27 15:39:03 -0700 | [diff] [blame] | 646 | compat_uptr_t auth_flavours; |
David Howells | 9a9947b | 2005-04-18 10:54:51 -0700 | [diff] [blame] | 647 | }; |
| 648 | |
| 649 | static int do_nfs4_super_data_conv(void *raw_data) |
| 650 | { |
| 651 | int version = *(compat_uint_t *) raw_data; |
| 652 | |
| 653 | if (version == 1) { |
| 654 | struct compat_nfs4_mount_data_v1 *raw = raw_data; |
| 655 | struct nfs4_mount_data *real = raw_data; |
| 656 | |
| 657 | /* copy the fields backwards */ |
| 658 | real->auth_flavours = compat_ptr(raw->auth_flavours); |
| 659 | real->auth_flavourlen = raw->auth_flavourlen; |
| 660 | real->proto = raw->proto; |
| 661 | real->host_addr = compat_ptr(raw->host_addr); |
| 662 | real->host_addrlen = raw->host_addrlen; |
| 663 | compat_nfs_string(&real->hostname, &raw->hostname); |
| 664 | compat_nfs_string(&real->mnt_path, &raw->mnt_path); |
| 665 | compat_nfs_string(&real->client_addr, &raw->client_addr); |
| 666 | real->acdirmax = raw->acdirmax; |
| 667 | real->acdirmin = raw->acdirmin; |
| 668 | real->acregmax = raw->acregmax; |
| 669 | real->acregmin = raw->acregmin; |
| 670 | real->retrans = raw->retrans; |
| 671 | real->timeo = raw->timeo; |
| 672 | real->wsize = raw->wsize; |
| 673 | real->rsize = raw->rsize; |
| 674 | real->flags = raw->flags; |
| 675 | real->version = raw->version; |
| 676 | } |
| 677 | else { |
| 678 | return -EINVAL; |
| 679 | } |
| 680 | |
| 681 | return 0; |
| 682 | } |
| 683 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 684 | #define SMBFS_NAME "smbfs" |
| 685 | #define NCPFS_NAME "ncpfs" |
David Howells | 9a9947b | 2005-04-18 10:54:51 -0700 | [diff] [blame] | 686 | #define NFS4_NAME "nfs4" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 687 | |
| 688 | asmlinkage long compat_sys_mount(char __user * dev_name, char __user * dir_name, |
| 689 | char __user * type, unsigned long flags, |
| 690 | void __user * data) |
| 691 | { |
| 692 | unsigned long type_page; |
| 693 | unsigned long data_page; |
| 694 | unsigned long dev_page; |
| 695 | char *dir_page; |
| 696 | int retval; |
| 697 | |
| 698 | retval = copy_mount_options (type, &type_page); |
| 699 | if (retval < 0) |
| 700 | goto out; |
| 701 | |
| 702 | dir_page = getname(dir_name); |
| 703 | retval = PTR_ERR(dir_page); |
| 704 | if (IS_ERR(dir_page)) |
| 705 | goto out1; |
| 706 | |
| 707 | retval = copy_mount_options (dev_name, &dev_page); |
| 708 | if (retval < 0) |
| 709 | goto out2; |
| 710 | |
| 711 | retval = copy_mount_options (data, &data_page); |
| 712 | if (retval < 0) |
| 713 | goto out3; |
| 714 | |
| 715 | retval = -EINVAL; |
| 716 | |
Andrey Mirkin | 822191a | 2006-12-06 20:31:35 -0800 | [diff] [blame] | 717 | if (type_page && data_page) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 718 | if (!strcmp((char *)type_page, SMBFS_NAME)) { |
| 719 | do_smb_super_data_conv((void *)data_page); |
| 720 | } else if (!strcmp((char *)type_page, NCPFS_NAME)) { |
| 721 | do_ncp_super_data_conv((void *)data_page); |
David Howells | 9a9947b | 2005-04-18 10:54:51 -0700 | [diff] [blame] | 722 | } else if (!strcmp((char *)type_page, NFS4_NAME)) { |
| 723 | if (do_nfs4_super_data_conv((void *) data_page)) |
| 724 | goto out4; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 725 | } |
| 726 | } |
| 727 | |
| 728 | lock_kernel(); |
| 729 | retval = do_mount((char*)dev_page, dir_page, (char*)type_page, |
| 730 | flags, (void*)data_page); |
| 731 | unlock_kernel(); |
| 732 | |
David Howells | 9a9947b | 2005-04-18 10:54:51 -0700 | [diff] [blame] | 733 | out4: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 734 | free_page(data_page); |
| 735 | out3: |
| 736 | free_page(dev_page); |
| 737 | out2: |
| 738 | putname(dir_page); |
| 739 | out1: |
| 740 | free_page(type_page); |
| 741 | out: |
| 742 | return retval; |
| 743 | } |
| 744 | |
| 745 | #define NAME_OFFSET(de) ((int) ((de)->d_name - (char __user *) (de))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 746 | |
| 747 | struct compat_old_linux_dirent { |
| 748 | compat_ulong_t d_ino; |
| 749 | compat_ulong_t d_offset; |
| 750 | unsigned short d_namlen; |
| 751 | char d_name[1]; |
| 752 | }; |
| 753 | |
| 754 | struct compat_readdir_callback { |
| 755 | struct compat_old_linux_dirent __user *dirent; |
| 756 | int result; |
| 757 | }; |
| 758 | |
| 759 | static int compat_fillonedir(void *__buf, const char *name, int namlen, |
David Howells | afefdbb | 2006-10-03 01:13:46 -0700 | [diff] [blame] | 760 | loff_t offset, u64 ino, unsigned int d_type) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 761 | { |
| 762 | struct compat_readdir_callback *buf = __buf; |
| 763 | struct compat_old_linux_dirent __user *dirent; |
David Howells | afefdbb | 2006-10-03 01:13:46 -0700 | [diff] [blame] | 764 | compat_ulong_t d_ino; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 765 | |
| 766 | if (buf->result) |
| 767 | return -EINVAL; |
David Howells | afefdbb | 2006-10-03 01:13:46 -0700 | [diff] [blame] | 768 | d_ino = ino; |
| 769 | if (sizeof(d_ino) < sizeof(ino) && d_ino != ino) |
| 770 | return -EOVERFLOW; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 771 | buf->result++; |
| 772 | dirent = buf->dirent; |
| 773 | if (!access_ok(VERIFY_WRITE, dirent, |
| 774 | (unsigned long)(dirent->d_name + namlen + 1) - |
| 775 | (unsigned long)dirent)) |
| 776 | goto efault; |
David Howells | afefdbb | 2006-10-03 01:13:46 -0700 | [diff] [blame] | 777 | if ( __put_user(d_ino, &dirent->d_ino) || |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 778 | __put_user(offset, &dirent->d_offset) || |
| 779 | __put_user(namlen, &dirent->d_namlen) || |
| 780 | __copy_to_user(dirent->d_name, name, namlen) || |
| 781 | __put_user(0, dirent->d_name + namlen)) |
| 782 | goto efault; |
| 783 | return 0; |
| 784 | efault: |
| 785 | buf->result = -EFAULT; |
| 786 | return -EFAULT; |
| 787 | } |
| 788 | |
| 789 | asmlinkage long compat_sys_old_readdir(unsigned int fd, |
| 790 | struct compat_old_linux_dirent __user *dirent, unsigned int count) |
| 791 | { |
| 792 | int error; |
| 793 | struct file *file; |
| 794 | struct compat_readdir_callback buf; |
| 795 | |
| 796 | error = -EBADF; |
| 797 | file = fget(fd); |
| 798 | if (!file) |
| 799 | goto out; |
| 800 | |
| 801 | buf.result = 0; |
| 802 | buf.dirent = dirent; |
| 803 | |
| 804 | error = vfs_readdir(file, compat_fillonedir, &buf); |
| 805 | if (error >= 0) |
| 806 | error = buf.result; |
| 807 | |
| 808 | fput(file); |
| 809 | out: |
| 810 | return error; |
| 811 | } |
| 812 | |
| 813 | struct compat_linux_dirent { |
| 814 | compat_ulong_t d_ino; |
| 815 | compat_ulong_t d_off; |
| 816 | unsigned short d_reclen; |
| 817 | char d_name[1]; |
| 818 | }; |
| 819 | |
| 820 | struct compat_getdents_callback { |
| 821 | struct compat_linux_dirent __user *current_dir; |
| 822 | struct compat_linux_dirent __user *previous; |
| 823 | int count; |
| 824 | int error; |
| 825 | }; |
| 826 | |
| 827 | static int compat_filldir(void *__buf, const char *name, int namlen, |
David Howells | afefdbb | 2006-10-03 01:13:46 -0700 | [diff] [blame] | 828 | loff_t offset, u64 ino, unsigned int d_type) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 829 | { |
| 830 | struct compat_linux_dirent __user * dirent; |
| 831 | struct compat_getdents_callback *buf = __buf; |
David Howells | afefdbb | 2006-10-03 01:13:46 -0700 | [diff] [blame] | 832 | compat_ulong_t d_ino; |
Milind Arun Choudhary | 022a169 | 2007-05-08 00:29:02 -0700 | [diff] [blame] | 833 | int reclen = ALIGN(NAME_OFFSET(dirent) + namlen + 2, sizeof(compat_long_t)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 834 | |
| 835 | buf->error = -EINVAL; /* only used if we fail.. */ |
| 836 | if (reclen > buf->count) |
| 837 | return -EINVAL; |
David Howells | afefdbb | 2006-10-03 01:13:46 -0700 | [diff] [blame] | 838 | d_ino = ino; |
| 839 | if (sizeof(d_ino) < sizeof(ino) && d_ino != ino) |
| 840 | return -EOVERFLOW; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 841 | dirent = buf->previous; |
| 842 | if (dirent) { |
| 843 | if (__put_user(offset, &dirent->d_off)) |
| 844 | goto efault; |
| 845 | } |
| 846 | dirent = buf->current_dir; |
David Howells | afefdbb | 2006-10-03 01:13:46 -0700 | [diff] [blame] | 847 | if (__put_user(d_ino, &dirent->d_ino)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 848 | goto efault; |
| 849 | if (__put_user(reclen, &dirent->d_reclen)) |
| 850 | goto efault; |
| 851 | if (copy_to_user(dirent->d_name, name, namlen)) |
| 852 | goto efault; |
| 853 | if (__put_user(0, dirent->d_name + namlen)) |
| 854 | goto efault; |
| 855 | if (__put_user(d_type, (char __user *) dirent + reclen - 1)) |
| 856 | goto efault; |
| 857 | buf->previous = dirent; |
| 858 | dirent = (void __user *)dirent + reclen; |
| 859 | buf->current_dir = dirent; |
| 860 | buf->count -= reclen; |
| 861 | return 0; |
| 862 | efault: |
| 863 | buf->error = -EFAULT; |
| 864 | return -EFAULT; |
| 865 | } |
| 866 | |
| 867 | asmlinkage long compat_sys_getdents(unsigned int fd, |
| 868 | struct compat_linux_dirent __user *dirent, unsigned int count) |
| 869 | { |
| 870 | struct file * file; |
| 871 | struct compat_linux_dirent __user * lastdirent; |
| 872 | struct compat_getdents_callback buf; |
| 873 | int error; |
| 874 | |
| 875 | error = -EFAULT; |
| 876 | if (!access_ok(VERIFY_WRITE, dirent, count)) |
| 877 | goto out; |
| 878 | |
| 879 | error = -EBADF; |
| 880 | file = fget(fd); |
| 881 | if (!file) |
| 882 | goto out; |
| 883 | |
| 884 | buf.current_dir = dirent; |
| 885 | buf.previous = NULL; |
| 886 | buf.count = count; |
| 887 | buf.error = 0; |
| 888 | |
| 889 | error = vfs_readdir(file, compat_filldir, &buf); |
| 890 | if (error < 0) |
| 891 | goto out_putf; |
| 892 | error = buf.error; |
| 893 | lastdirent = buf.previous; |
| 894 | if (lastdirent) { |
| 895 | if (put_user(file->f_pos, &lastdirent->d_off)) |
| 896 | error = -EFAULT; |
| 897 | else |
| 898 | error = count - buf.count; |
| 899 | } |
| 900 | |
| 901 | out_putf: |
| 902 | fput(file); |
| 903 | out: |
| 904 | return error; |
| 905 | } |
| 906 | |
| 907 | #ifndef __ARCH_OMIT_COMPAT_SYS_GETDENTS64 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 908 | |
| 909 | struct compat_getdents_callback64 { |
| 910 | struct linux_dirent64 __user *current_dir; |
| 911 | struct linux_dirent64 __user *previous; |
| 912 | int count; |
| 913 | int error; |
| 914 | }; |
| 915 | |
| 916 | static int compat_filldir64(void * __buf, const char * name, int namlen, loff_t offset, |
David Howells | afefdbb | 2006-10-03 01:13:46 -0700 | [diff] [blame] | 917 | u64 ino, unsigned int d_type) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 918 | { |
| 919 | struct linux_dirent64 __user *dirent; |
| 920 | struct compat_getdents_callback64 *buf = __buf; |
| 921 | int jj = NAME_OFFSET(dirent); |
Milind Arun Choudhary | 022a169 | 2007-05-08 00:29:02 -0700 | [diff] [blame] | 922 | int reclen = ALIGN(jj + namlen + 1, sizeof(u64)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 923 | u64 off; |
| 924 | |
| 925 | buf->error = -EINVAL; /* only used if we fail.. */ |
| 926 | if (reclen > buf->count) |
| 927 | return -EINVAL; |
| 928 | dirent = buf->previous; |
| 929 | |
| 930 | if (dirent) { |
| 931 | if (__put_user_unaligned(offset, &dirent->d_off)) |
| 932 | goto efault; |
| 933 | } |
| 934 | dirent = buf->current_dir; |
| 935 | if (__put_user_unaligned(ino, &dirent->d_ino)) |
| 936 | goto efault; |
| 937 | off = 0; |
| 938 | if (__put_user_unaligned(off, &dirent->d_off)) |
| 939 | goto efault; |
| 940 | if (__put_user(reclen, &dirent->d_reclen)) |
| 941 | goto efault; |
| 942 | if (__put_user(d_type, &dirent->d_type)) |
| 943 | goto efault; |
| 944 | if (copy_to_user(dirent->d_name, name, namlen)) |
| 945 | goto efault; |
| 946 | if (__put_user(0, dirent->d_name + namlen)) |
| 947 | goto efault; |
| 948 | buf->previous = dirent; |
| 949 | dirent = (void __user *)dirent + reclen; |
| 950 | buf->current_dir = dirent; |
| 951 | buf->count -= reclen; |
| 952 | return 0; |
| 953 | efault: |
| 954 | buf->error = -EFAULT; |
| 955 | return -EFAULT; |
| 956 | } |
| 957 | |
| 958 | asmlinkage long compat_sys_getdents64(unsigned int fd, |
| 959 | struct linux_dirent64 __user * dirent, unsigned int count) |
| 960 | { |
| 961 | struct file * file; |
| 962 | struct linux_dirent64 __user * lastdirent; |
| 963 | struct compat_getdents_callback64 buf; |
| 964 | int error; |
| 965 | |
| 966 | error = -EFAULT; |
| 967 | if (!access_ok(VERIFY_WRITE, dirent, count)) |
| 968 | goto out; |
| 969 | |
| 970 | error = -EBADF; |
| 971 | file = fget(fd); |
| 972 | if (!file) |
| 973 | goto out; |
| 974 | |
| 975 | buf.current_dir = dirent; |
| 976 | buf.previous = NULL; |
| 977 | buf.count = count; |
| 978 | buf.error = 0; |
| 979 | |
| 980 | error = vfs_readdir(file, compat_filldir64, &buf); |
| 981 | if (error < 0) |
| 982 | goto out_putf; |
| 983 | error = buf.error; |
| 984 | lastdirent = buf.previous; |
| 985 | if (lastdirent) { |
| 986 | typeof(lastdirent->d_off) d_off = file->f_pos; |
Heiko Carstens | 7116e99 | 2006-12-06 20:36:36 -0800 | [diff] [blame] | 987 | error = -EFAULT; |
| 988 | if (__put_user_unaligned(d_off, &lastdirent->d_off)) |
| 989 | goto out_putf; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 990 | error = count - buf.count; |
| 991 | } |
| 992 | |
| 993 | out_putf: |
| 994 | fput(file); |
| 995 | out: |
| 996 | return error; |
| 997 | } |
| 998 | #endif /* ! __ARCH_OMIT_COMPAT_SYS_GETDENTS64 */ |
| 999 | |
| 1000 | static ssize_t compat_do_readv_writev(int type, struct file *file, |
| 1001 | const struct compat_iovec __user *uvector, |
| 1002 | unsigned long nr_segs, loff_t *pos) |
| 1003 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1004 | compat_ssize_t tot_len; |
| 1005 | struct iovec iovstack[UIO_FASTIOV]; |
| 1006 | struct iovec *iov=iovstack, *vector; |
| 1007 | ssize_t ret; |
| 1008 | int seg; |
| 1009 | io_fn_t fn; |
| 1010 | iov_fn_t fnv; |
| 1011 | |
| 1012 | /* |
| 1013 | * SuS says "The readv() function *may* fail if the iovcnt argument |
| 1014 | * was less than or equal to 0, or greater than {IOV_MAX}. Linux has |
| 1015 | * traditionally returned zero for zero segments, so... |
| 1016 | */ |
| 1017 | ret = 0; |
| 1018 | if (nr_segs == 0) |
| 1019 | goto out; |
| 1020 | |
| 1021 | /* |
| 1022 | * First get the "struct iovec" from user memory and |
| 1023 | * verify all the pointers |
| 1024 | */ |
| 1025 | ret = -EINVAL; |
| 1026 | if ((nr_segs > UIO_MAXIOV) || (nr_segs <= 0)) |
| 1027 | goto out; |
| 1028 | if (!file->f_op) |
| 1029 | goto out; |
| 1030 | if (nr_segs > UIO_FASTIOV) { |
| 1031 | ret = -ENOMEM; |
| 1032 | iov = kmalloc(nr_segs*sizeof(struct iovec), GFP_KERNEL); |
| 1033 | if (!iov) |
| 1034 | goto out; |
| 1035 | } |
| 1036 | ret = -EFAULT; |
| 1037 | if (!access_ok(VERIFY_READ, uvector, nr_segs*sizeof(*uvector))) |
| 1038 | goto out; |
| 1039 | |
| 1040 | /* |
| 1041 | * Single unix specification: |
| 1042 | * We should -EINVAL if an element length is not >= 0 and fitting an |
| 1043 | * ssize_t. The total length is fitting an ssize_t |
| 1044 | * |
| 1045 | * Be careful here because iov_len is a size_t not an ssize_t |
| 1046 | */ |
| 1047 | tot_len = 0; |
| 1048 | vector = iov; |
| 1049 | ret = -EINVAL; |
| 1050 | for (seg = 0 ; seg < nr_segs; seg++) { |
| 1051 | compat_ssize_t tmp = tot_len; |
| 1052 | compat_ssize_t len; |
| 1053 | compat_uptr_t buf; |
| 1054 | |
| 1055 | if (__get_user(len, &uvector->iov_len) || |
| 1056 | __get_user(buf, &uvector->iov_base)) { |
| 1057 | ret = -EFAULT; |
| 1058 | goto out; |
| 1059 | } |
| 1060 | if (len < 0) /* size_t not fitting an compat_ssize_t .. */ |
| 1061 | goto out; |
| 1062 | tot_len += len; |
| 1063 | if (tot_len < tmp) /* maths overflow on the compat_ssize_t */ |
| 1064 | goto out; |
| 1065 | vector->iov_base = compat_ptr(buf); |
| 1066 | vector->iov_len = (compat_size_t) len; |
| 1067 | uvector++; |
| 1068 | vector++; |
| 1069 | } |
| 1070 | if (tot_len == 0) { |
| 1071 | ret = 0; |
| 1072 | goto out; |
| 1073 | } |
| 1074 | |
| 1075 | ret = rw_verify_area(type, file, pos, tot_len); |
Linus Torvalds | e28cc71 | 2006-01-04 16:20:40 -0800 | [diff] [blame] | 1076 | if (ret < 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1077 | goto out; |
| 1078 | |
James Morris | e7edf9c | 2006-04-26 02:45:03 -0400 | [diff] [blame] | 1079 | ret = security_file_permission(file, type == READ ? MAY_READ:MAY_WRITE); |
| 1080 | if (ret) |
| 1081 | goto out; |
| 1082 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1083 | fnv = NULL; |
| 1084 | if (type == READ) { |
| 1085 | fn = file->f_op->read; |
Badari Pulavarty | ee0b3e6 | 2006-09-30 23:28:47 -0700 | [diff] [blame] | 1086 | fnv = file->f_op->aio_read; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1087 | } else { |
| 1088 | fn = (io_fn_t)file->f_op->write; |
Badari Pulavarty | ee0b3e6 | 2006-09-30 23:28:47 -0700 | [diff] [blame] | 1089 | fnv = file->f_op->aio_write; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1090 | } |
| 1091 | |
Badari Pulavarty | ee0b3e6 | 2006-09-30 23:28:47 -0700 | [diff] [blame] | 1092 | if (fnv) |
| 1093 | ret = do_sync_readv_writev(file, iov, nr_segs, tot_len, |
| 1094 | pos, fnv); |
| 1095 | else |
| 1096 | ret = do_loop_readv_writev(file, iov, nr_segs, pos, fn); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1097 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1098 | out: |
| 1099 | if (iov != iovstack) |
| 1100 | kfree(iov); |
Robert Love | 0eeca28 | 2005-07-12 17:06:03 -0400 | [diff] [blame] | 1101 | if ((ret + (type == READ)) > 0) { |
Josef "Jeff" Sipek | 0f7fc9e | 2006-12-08 02:36:35 -0800 | [diff] [blame] | 1102 | struct dentry *dentry = file->f_path.dentry; |
Robert Love | 0eeca28 | 2005-07-12 17:06:03 -0400 | [diff] [blame] | 1103 | if (type == READ) |
| 1104 | fsnotify_access(dentry); |
| 1105 | else |
| 1106 | fsnotify_modify(dentry); |
| 1107 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1108 | return ret; |
| 1109 | } |
| 1110 | |
| 1111 | asmlinkage ssize_t |
| 1112 | compat_sys_readv(unsigned long fd, const struct compat_iovec __user *vec, unsigned long vlen) |
| 1113 | { |
| 1114 | struct file *file; |
| 1115 | ssize_t ret = -EBADF; |
| 1116 | |
| 1117 | file = fget(fd); |
| 1118 | if (!file) |
| 1119 | return -EBADF; |
| 1120 | |
| 1121 | if (!(file->f_mode & FMODE_READ)) |
| 1122 | goto out; |
| 1123 | |
| 1124 | ret = -EINVAL; |
Badari Pulavarty | ee0b3e6 | 2006-09-30 23:28:47 -0700 | [diff] [blame] | 1125 | if (!file->f_op || (!file->f_op->aio_read && !file->f_op->read)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1126 | goto out; |
| 1127 | |
| 1128 | ret = compat_do_readv_writev(READ, file, vec, vlen, &file->f_pos); |
| 1129 | |
| 1130 | out: |
| 1131 | fput(file); |
| 1132 | return ret; |
| 1133 | } |
| 1134 | |
| 1135 | asmlinkage ssize_t |
| 1136 | compat_sys_writev(unsigned long fd, const struct compat_iovec __user *vec, unsigned long vlen) |
| 1137 | { |
| 1138 | struct file *file; |
| 1139 | ssize_t ret = -EBADF; |
| 1140 | |
| 1141 | file = fget(fd); |
| 1142 | if (!file) |
| 1143 | return -EBADF; |
| 1144 | if (!(file->f_mode & FMODE_WRITE)) |
| 1145 | goto out; |
| 1146 | |
| 1147 | ret = -EINVAL; |
Badari Pulavarty | ee0b3e6 | 2006-09-30 23:28:47 -0700 | [diff] [blame] | 1148 | if (!file->f_op || (!file->f_op->aio_write && !file->f_op->write)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1149 | goto out; |
| 1150 | |
| 1151 | ret = compat_do_readv_writev(WRITE, file, vec, vlen, &file->f_pos); |
| 1152 | |
| 1153 | out: |
| 1154 | fput(file); |
| 1155 | return ret; |
| 1156 | } |
| 1157 | |
Andi Kleen | d261020 | 2006-05-01 12:15:48 -0700 | [diff] [blame] | 1158 | asmlinkage long |
| 1159 | compat_sys_vmsplice(int fd, const struct compat_iovec __user *iov32, |
| 1160 | unsigned int nr_segs, unsigned int flags) |
| 1161 | { |
| 1162 | unsigned i; |
Al Viro | 90cbad6 | 2006-10-10 22:44:17 +0100 | [diff] [blame] | 1163 | struct iovec __user *iov; |
Jens Axboe | 98232d5 | 2006-05-04 09:13:49 +0200 | [diff] [blame] | 1164 | if (nr_segs > UIO_MAXIOV) |
Andi Kleen | d261020 | 2006-05-01 12:15:48 -0700 | [diff] [blame] | 1165 | return -EINVAL; |
| 1166 | iov = compat_alloc_user_space(nr_segs * sizeof(struct iovec)); |
| 1167 | for (i = 0; i < nr_segs; i++) { |
| 1168 | struct compat_iovec v; |
| 1169 | if (get_user(v.iov_base, &iov32[i].iov_base) || |
| 1170 | get_user(v.iov_len, &iov32[i].iov_len) || |
| 1171 | put_user(compat_ptr(v.iov_base), &iov[i].iov_base) || |
| 1172 | put_user(v.iov_len, &iov[i].iov_len)) |
| 1173 | return -EFAULT; |
| 1174 | } |
| 1175 | return sys_vmsplice(fd, iov, nr_segs, flags); |
| 1176 | } |
| 1177 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1178 | /* |
Miklos Szeredi | e922efc | 2005-09-06 15:18:25 -0700 | [diff] [blame] | 1179 | * Exactly like fs/open.c:sys_open(), except that it doesn't set the |
| 1180 | * O_LARGEFILE flag. |
| 1181 | */ |
| 1182 | asmlinkage long |
| 1183 | compat_sys_open(const char __user *filename, int flags, int mode) |
| 1184 | { |
Ulrich Drepper | 5590ff0 | 2006-01-18 17:43:53 -0800 | [diff] [blame] | 1185 | return do_sys_open(AT_FDCWD, filename, flags, mode); |
| 1186 | } |
| 1187 | |
| 1188 | /* |
| 1189 | * Exactly like fs/open.c:sys_openat(), except that it doesn't set the |
| 1190 | * O_LARGEFILE flag. |
| 1191 | */ |
| 1192 | asmlinkage long |
Stephen Rothwell | 9ad11ab | 2006-02-02 16:11:51 +1100 | [diff] [blame] | 1193 | compat_sys_openat(unsigned int dfd, const char __user *filename, int flags, int mode) |
Ulrich Drepper | 5590ff0 | 2006-01-18 17:43:53 -0800 | [diff] [blame] | 1194 | { |
| 1195 | return do_sys_open(dfd, filename, flags, mode); |
Miklos Szeredi | e922efc | 2005-09-06 15:18:25 -0700 | [diff] [blame] | 1196 | } |
| 1197 | |
| 1198 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1199 | * compat_count() counts the number of arguments/envelopes. It is basically |
| 1200 | * a copy of count() from fs/exec.c, except that it works with 32 bit argv |
| 1201 | * and envp pointers. |
| 1202 | */ |
| 1203 | static int compat_count(compat_uptr_t __user *argv, int max) |
| 1204 | { |
| 1205 | int i = 0; |
| 1206 | |
| 1207 | if (argv != NULL) { |
| 1208 | for (;;) { |
| 1209 | compat_uptr_t p; |
| 1210 | |
| 1211 | if (get_user(p, argv)) |
| 1212 | return -EFAULT; |
| 1213 | if (!p) |
| 1214 | break; |
| 1215 | argv++; |
| 1216 | if(++i > max) |
| 1217 | return -E2BIG; |
| 1218 | } |
| 1219 | } |
| 1220 | return i; |
| 1221 | } |
| 1222 | |
| 1223 | /* |
| 1224 | * compat_copy_strings() is basically a copy of copy_strings() from fs/exec.c |
| 1225 | * except that it works with 32 bit argv and envp pointers. |
| 1226 | */ |
| 1227 | static int compat_copy_strings(int argc, compat_uptr_t __user *argv, |
| 1228 | struct linux_binprm *bprm) |
| 1229 | { |
| 1230 | struct page *kmapped_page = NULL; |
| 1231 | char *kaddr = NULL; |
| 1232 | int ret; |
| 1233 | |
| 1234 | while (argc-- > 0) { |
| 1235 | compat_uptr_t str; |
| 1236 | int len; |
| 1237 | unsigned long pos; |
| 1238 | |
| 1239 | if (get_user(str, argv+argc) || |
| 1240 | !(len = strnlen_user(compat_ptr(str), bprm->p))) { |
| 1241 | ret = -EFAULT; |
| 1242 | goto out; |
| 1243 | } |
| 1244 | |
| 1245 | if (bprm->p < len) { |
| 1246 | ret = -E2BIG; |
| 1247 | goto out; |
| 1248 | } |
| 1249 | |
| 1250 | bprm->p -= len; |
| 1251 | /* XXX: add architecture specific overflow check here. */ |
| 1252 | pos = bprm->p; |
| 1253 | |
| 1254 | while (len > 0) { |
| 1255 | int i, new, err; |
| 1256 | int offset, bytes_to_copy; |
| 1257 | struct page *page; |
| 1258 | |
| 1259 | offset = pos % PAGE_SIZE; |
| 1260 | i = pos/PAGE_SIZE; |
| 1261 | page = bprm->page[i]; |
| 1262 | new = 0; |
| 1263 | if (!page) { |
| 1264 | page = alloc_page(GFP_HIGHUSER); |
| 1265 | bprm->page[i] = page; |
| 1266 | if (!page) { |
| 1267 | ret = -ENOMEM; |
| 1268 | goto out; |
| 1269 | } |
| 1270 | new = 1; |
| 1271 | } |
| 1272 | |
| 1273 | if (page != kmapped_page) { |
| 1274 | if (kmapped_page) |
| 1275 | kunmap(kmapped_page); |
| 1276 | kmapped_page = page; |
| 1277 | kaddr = kmap(kmapped_page); |
| 1278 | } |
| 1279 | if (new && offset) |
| 1280 | memset(kaddr, 0, offset); |
| 1281 | bytes_to_copy = PAGE_SIZE - offset; |
| 1282 | if (bytes_to_copy > len) { |
| 1283 | bytes_to_copy = len; |
| 1284 | if (new) |
| 1285 | memset(kaddr+offset+len, 0, |
| 1286 | PAGE_SIZE-offset-len); |
| 1287 | } |
| 1288 | err = copy_from_user(kaddr+offset, compat_ptr(str), |
| 1289 | bytes_to_copy); |
| 1290 | if (err) { |
| 1291 | ret = -EFAULT; |
| 1292 | goto out; |
| 1293 | } |
| 1294 | |
| 1295 | pos += bytes_to_copy; |
| 1296 | str += bytes_to_copy; |
| 1297 | len -= bytes_to_copy; |
| 1298 | } |
| 1299 | } |
| 1300 | ret = 0; |
| 1301 | out: |
| 1302 | if (kmapped_page) |
| 1303 | kunmap(kmapped_page); |
| 1304 | return ret; |
| 1305 | } |
| 1306 | |
| 1307 | #ifdef CONFIG_MMU |
| 1308 | |
| 1309 | #define free_arg_pages(bprm) do { } while (0) |
| 1310 | |
| 1311 | #else |
| 1312 | |
| 1313 | static inline void free_arg_pages(struct linux_binprm *bprm) |
| 1314 | { |
| 1315 | int i; |
| 1316 | |
| 1317 | for (i = 0; i < MAX_ARG_PAGES; i++) { |
| 1318 | if (bprm->page[i]) |
| 1319 | __free_page(bprm->page[i]); |
| 1320 | bprm->page[i] = NULL; |
| 1321 | } |
| 1322 | } |
| 1323 | |
| 1324 | #endif /* CONFIG_MMU */ |
| 1325 | |
| 1326 | /* |
| 1327 | * compat_do_execve() is mostly a copy of do_execve(), with the exception |
| 1328 | * that it processes 32 bit argv and envp pointers. |
| 1329 | */ |
| 1330 | int compat_do_execve(char * filename, |
| 1331 | compat_uptr_t __user *argv, |
| 1332 | compat_uptr_t __user *envp, |
| 1333 | struct pt_regs * regs) |
| 1334 | { |
| 1335 | struct linux_binprm *bprm; |
| 1336 | struct file *file; |
| 1337 | int retval; |
| 1338 | int i; |
| 1339 | |
| 1340 | retval = -ENOMEM; |
Oliver Neukum | 11b0b5a | 2006-03-25 03:08:13 -0800 | [diff] [blame] | 1341 | bprm = kzalloc(sizeof(*bprm), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1342 | if (!bprm) |
| 1343 | goto out_ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1344 | |
| 1345 | file = open_exec(filename); |
| 1346 | retval = PTR_ERR(file); |
| 1347 | if (IS_ERR(file)) |
| 1348 | goto out_kfree; |
| 1349 | |
| 1350 | sched_exec(); |
| 1351 | |
| 1352 | bprm->p = PAGE_SIZE*MAX_ARG_PAGES-sizeof(void *); |
| 1353 | bprm->file = file; |
| 1354 | bprm->filename = filename; |
| 1355 | bprm->interp = filename; |
| 1356 | bprm->mm = mm_alloc(); |
| 1357 | retval = -ENOMEM; |
| 1358 | if (!bprm->mm) |
| 1359 | goto out_file; |
| 1360 | |
| 1361 | retval = init_new_context(current, bprm->mm); |
| 1362 | if (retval < 0) |
| 1363 | goto out_mm; |
| 1364 | |
| 1365 | bprm->argc = compat_count(argv, bprm->p / sizeof(compat_uptr_t)); |
| 1366 | if ((retval = bprm->argc) < 0) |
| 1367 | goto out_mm; |
| 1368 | |
| 1369 | bprm->envc = compat_count(envp, bprm->p / sizeof(compat_uptr_t)); |
| 1370 | if ((retval = bprm->envc) < 0) |
| 1371 | goto out_mm; |
| 1372 | |
| 1373 | retval = security_bprm_alloc(bprm); |
| 1374 | if (retval) |
| 1375 | goto out; |
| 1376 | |
| 1377 | retval = prepare_binprm(bprm); |
| 1378 | if (retval < 0) |
| 1379 | goto out; |
| 1380 | |
| 1381 | retval = copy_strings_kernel(1, &bprm->filename, bprm); |
| 1382 | if (retval < 0) |
| 1383 | goto out; |
| 1384 | |
| 1385 | bprm->exec = bprm->p; |
| 1386 | retval = compat_copy_strings(bprm->envc, envp, bprm); |
| 1387 | if (retval < 0) |
| 1388 | goto out; |
| 1389 | |
| 1390 | retval = compat_copy_strings(bprm->argc, argv, bprm); |
| 1391 | if (retval < 0) |
| 1392 | goto out; |
| 1393 | |
| 1394 | retval = search_binary_handler(bprm, regs); |
| 1395 | if (retval >= 0) { |
| 1396 | free_arg_pages(bprm); |
| 1397 | |
| 1398 | /* execve success */ |
| 1399 | security_bprm_free(bprm); |
David S. Miller | 4a805e8 | 2005-09-14 21:40:00 -0700 | [diff] [blame] | 1400 | acct_update_integrals(current); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1401 | kfree(bprm); |
| 1402 | return retval; |
| 1403 | } |
| 1404 | |
| 1405 | out: |
| 1406 | /* Something went wrong, return the inode and free the argument pages*/ |
| 1407 | for (i = 0 ; i < MAX_ARG_PAGES ; i++) { |
| 1408 | struct page * page = bprm->page[i]; |
| 1409 | if (page) |
| 1410 | __free_page(page); |
| 1411 | } |
| 1412 | |
| 1413 | if (bprm->security) |
| 1414 | security_bprm_free(bprm); |
| 1415 | |
| 1416 | out_mm: |
| 1417 | if (bprm->mm) |
| 1418 | mmdrop(bprm->mm); |
| 1419 | |
| 1420 | out_file: |
| 1421 | if (bprm->file) { |
| 1422 | allow_write_access(bprm->file); |
| 1423 | fput(bprm->file); |
| 1424 | } |
| 1425 | |
| 1426 | out_kfree: |
| 1427 | kfree(bprm); |
| 1428 | |
| 1429 | out_ret: |
| 1430 | return retval; |
| 1431 | } |
| 1432 | |
| 1433 | #define __COMPAT_NFDBITS (8 * sizeof(compat_ulong_t)) |
| 1434 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1435 | /* |
| 1436 | * Ooo, nasty. We need here to frob 32-bit unsigned longs to |
| 1437 | * 64-bit unsigned longs. |
| 1438 | */ |
Arjan van de Ven | 858119e | 2006-01-14 13:20:43 -0800 | [diff] [blame] | 1439 | static |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1440 | int compat_get_fd_set(unsigned long nr, compat_ulong_t __user *ufdset, |
| 1441 | unsigned long *fdset) |
| 1442 | { |
Milind Arun Choudhary | 022a169 | 2007-05-08 00:29:02 -0700 | [diff] [blame] | 1443 | nr = DIV_ROUND_UP(nr, __COMPAT_NFDBITS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1444 | if (ufdset) { |
| 1445 | unsigned long odd; |
| 1446 | |
| 1447 | if (!access_ok(VERIFY_WRITE, ufdset, nr*sizeof(compat_ulong_t))) |
| 1448 | return -EFAULT; |
| 1449 | |
| 1450 | odd = nr & 1UL; |
| 1451 | nr &= ~1UL; |
| 1452 | while (nr) { |
| 1453 | unsigned long h, l; |
Heiko Carstens | 7116e99 | 2006-12-06 20:36:36 -0800 | [diff] [blame] | 1454 | if (__get_user(l, ufdset) || __get_user(h, ufdset+1)) |
| 1455 | return -EFAULT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1456 | ufdset += 2; |
| 1457 | *fdset++ = h << 32 | l; |
| 1458 | nr -= 2; |
| 1459 | } |
Heiko Carstens | 7116e99 | 2006-12-06 20:36:36 -0800 | [diff] [blame] | 1460 | if (odd && __get_user(*fdset, ufdset)) |
| 1461 | return -EFAULT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1462 | } else { |
| 1463 | /* Tricky, must clear full unsigned long in the |
| 1464 | * kernel fdset at the end, this makes sure that |
| 1465 | * actually happens. |
| 1466 | */ |
| 1467 | memset(fdset, 0, ((nr + 1) & ~1)*sizeof(compat_ulong_t)); |
| 1468 | } |
| 1469 | return 0; |
| 1470 | } |
| 1471 | |
Arjan van de Ven | 858119e | 2006-01-14 13:20:43 -0800 | [diff] [blame] | 1472 | static |
Heiko Carstens | 7116e99 | 2006-12-06 20:36:36 -0800 | [diff] [blame] | 1473 | int compat_set_fd_set(unsigned long nr, compat_ulong_t __user *ufdset, |
| 1474 | unsigned long *fdset) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1475 | { |
| 1476 | unsigned long odd; |
Milind Arun Choudhary | 022a169 | 2007-05-08 00:29:02 -0700 | [diff] [blame] | 1477 | nr = DIV_ROUND_UP(nr, __COMPAT_NFDBITS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1478 | |
| 1479 | if (!ufdset) |
Heiko Carstens | 7116e99 | 2006-12-06 20:36:36 -0800 | [diff] [blame] | 1480 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1481 | |
| 1482 | odd = nr & 1UL; |
| 1483 | nr &= ~1UL; |
| 1484 | while (nr) { |
| 1485 | unsigned long h, l; |
| 1486 | l = *fdset++; |
| 1487 | h = l >> 32; |
Heiko Carstens | 7116e99 | 2006-12-06 20:36:36 -0800 | [diff] [blame] | 1488 | if (__put_user(l, ufdset) || __put_user(h, ufdset+1)) |
| 1489 | return -EFAULT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1490 | ufdset += 2; |
| 1491 | nr -= 2; |
| 1492 | } |
Heiko Carstens | 7116e99 | 2006-12-06 20:36:36 -0800 | [diff] [blame] | 1493 | if (odd && __put_user(*fdset, ufdset)) |
| 1494 | return -EFAULT; |
| 1495 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1496 | } |
| 1497 | |
| 1498 | |
| 1499 | /* |
| 1500 | * This is a virtual copy of sys_select from fs/select.c and probably |
| 1501 | * should be compared to it from time to time |
| 1502 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1503 | |
| 1504 | /* |
| 1505 | * We can actually return ERESTARTSYS instead of EINTR, but I'd |
| 1506 | * like to be certain this leads to no problems. So I return |
| 1507 | * EINTR just for safety. |
| 1508 | * |
| 1509 | * Update: ERESTARTSYS breaks at least the xview clock binary, so |
| 1510 | * I'm trying ERESTARTNOHAND which restart only when you want to. |
| 1511 | */ |
| 1512 | #define MAX_SELECT_SECONDS \ |
| 1513 | ((unsigned long) (MAX_SCHEDULE_TIMEOUT / HZ)-1) |
| 1514 | |
David Woodhouse | 9f72949 | 2006-01-18 17:44:05 -0800 | [diff] [blame] | 1515 | int compat_core_sys_select(int n, compat_ulong_t __user *inp, |
| 1516 | compat_ulong_t __user *outp, compat_ulong_t __user *exp, s64 *timeout) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1517 | { |
| 1518 | fd_set_bits fds; |
| 1519 | char *bits; |
Vadim Lobanov | bbea9f6 | 2006-12-10 02:21:12 -0800 | [diff] [blame] | 1520 | int size, max_fds, ret = -EINVAL; |
Linus Torvalds | a4531ed | 2005-09-09 15:10:52 -0700 | [diff] [blame] | 1521 | struct fdtable *fdt; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1522 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1523 | if (n < 0) |
| 1524 | goto out_nofds; |
| 1525 | |
Vadim Lobanov | bbea9f6 | 2006-12-10 02:21:12 -0800 | [diff] [blame] | 1526 | /* max_fds can increase, so grab it once to avoid race */ |
Linus Torvalds | ac5b8b6 | 2005-09-09 15:42:34 -0700 | [diff] [blame] | 1527 | rcu_read_lock(); |
Linus Torvalds | a4531ed | 2005-09-09 15:10:52 -0700 | [diff] [blame] | 1528 | fdt = files_fdtable(current->files); |
Vadim Lobanov | bbea9f6 | 2006-12-10 02:21:12 -0800 | [diff] [blame] | 1529 | max_fds = fdt->max_fds; |
Linus Torvalds | ac5b8b6 | 2005-09-09 15:42:34 -0700 | [diff] [blame] | 1530 | rcu_read_unlock(); |
Vadim Lobanov | bbea9f6 | 2006-12-10 02:21:12 -0800 | [diff] [blame] | 1531 | if (n > max_fds) |
| 1532 | n = max_fds; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1533 | |
| 1534 | /* |
| 1535 | * We need 6 bitmaps (in/out/ex for both incoming and outgoing), |
| 1536 | * since we used fdset we need to allocate memory in units of |
| 1537 | * long-words. |
| 1538 | */ |
| 1539 | ret = -ENOMEM; |
| 1540 | size = FDS_BYTES(n); |
Vadim Lobanov | 68c3431 | 2006-03-28 01:56:35 -0800 | [diff] [blame] | 1541 | bits = kmalloc(6 * size, GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1542 | if (!bits) |
| 1543 | goto out_nofds; |
| 1544 | fds.in = (unsigned long *) bits; |
| 1545 | fds.out = (unsigned long *) (bits + size); |
| 1546 | fds.ex = (unsigned long *) (bits + 2*size); |
| 1547 | fds.res_in = (unsigned long *) (bits + 3*size); |
| 1548 | fds.res_out = (unsigned long *) (bits + 4*size); |
| 1549 | fds.res_ex = (unsigned long *) (bits + 5*size); |
| 1550 | |
| 1551 | if ((ret = compat_get_fd_set(n, inp, fds.in)) || |
| 1552 | (ret = compat_get_fd_set(n, outp, fds.out)) || |
| 1553 | (ret = compat_get_fd_set(n, exp, fds.ex))) |
| 1554 | goto out; |
| 1555 | zero_fd_set(n, fds.res_in); |
| 1556 | zero_fd_set(n, fds.res_out); |
| 1557 | zero_fd_set(n, fds.res_ex); |
| 1558 | |
David Woodhouse | 9f72949 | 2006-01-18 17:44:05 -0800 | [diff] [blame] | 1559 | ret = do_select(n, &fds, timeout); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1560 | |
| 1561 | if (ret < 0) |
| 1562 | goto out; |
| 1563 | if (!ret) { |
| 1564 | ret = -ERESTARTNOHAND; |
| 1565 | if (signal_pending(current)) |
| 1566 | goto out; |
| 1567 | ret = 0; |
| 1568 | } |
| 1569 | |
Heiko Carstens | 7116e99 | 2006-12-06 20:36:36 -0800 | [diff] [blame] | 1570 | if (compat_set_fd_set(n, inp, fds.res_in) || |
| 1571 | compat_set_fd_set(n, outp, fds.res_out) || |
| 1572 | compat_set_fd_set(n, exp, fds.res_ex)) |
| 1573 | ret = -EFAULT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1574 | out: |
Vadim Lobanov | 68c3431 | 2006-03-28 01:56:35 -0800 | [diff] [blame] | 1575 | kfree(bits); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1576 | out_nofds: |
| 1577 | return ret; |
| 1578 | } |
| 1579 | |
David Woodhouse | 9f72949 | 2006-01-18 17:44:05 -0800 | [diff] [blame] | 1580 | asmlinkage long compat_sys_select(int n, compat_ulong_t __user *inp, |
| 1581 | compat_ulong_t __user *outp, compat_ulong_t __user *exp, |
| 1582 | struct compat_timeval __user *tvp) |
| 1583 | { |
| 1584 | s64 timeout = -1; |
| 1585 | struct compat_timeval tv; |
| 1586 | int ret; |
| 1587 | |
| 1588 | if (tvp) { |
| 1589 | if (copy_from_user(&tv, tvp, sizeof(tv))) |
| 1590 | return -EFAULT; |
| 1591 | |
| 1592 | if (tv.tv_sec < 0 || tv.tv_usec < 0) |
| 1593 | return -EINVAL; |
| 1594 | |
| 1595 | /* Cast to u64 to make GCC stop complaining */ |
| 1596 | if ((u64)tv.tv_sec >= (u64)MAX_INT64_SECONDS) |
| 1597 | timeout = -1; /* infinite */ |
| 1598 | else { |
Milind Arun Choudhary | 022a169 | 2007-05-08 00:29:02 -0700 | [diff] [blame] | 1599 | timeout = DIV_ROUND_UP(tv.tv_usec, 1000000/HZ); |
David Woodhouse | 9f72949 | 2006-01-18 17:44:05 -0800 | [diff] [blame] | 1600 | timeout += tv.tv_sec * HZ; |
| 1601 | } |
| 1602 | } |
| 1603 | |
| 1604 | ret = compat_core_sys_select(n, inp, outp, exp, &timeout); |
| 1605 | |
| 1606 | if (tvp) { |
Andrew Morton | 643a654 | 2006-02-11 17:55:52 -0800 | [diff] [blame] | 1607 | struct compat_timeval rtv; |
| 1608 | |
David Woodhouse | 9f72949 | 2006-01-18 17:44:05 -0800 | [diff] [blame] | 1609 | if (current->personality & STICKY_TIMEOUTS) |
| 1610 | goto sticky; |
Andrew Morton | 643a654 | 2006-02-11 17:55:52 -0800 | [diff] [blame] | 1611 | rtv.tv_usec = jiffies_to_usecs(do_div((*(u64*)&timeout), HZ)); |
| 1612 | rtv.tv_sec = timeout; |
Andrew Morton | 74910e6 | 2006-02-17 13:52:58 -0800 | [diff] [blame] | 1613 | if (compat_timeval_compare(&rtv, &tv) >= 0) |
Andrew Morton | 643a654 | 2006-02-11 17:55:52 -0800 | [diff] [blame] | 1614 | rtv = tv; |
| 1615 | if (copy_to_user(tvp, &rtv, sizeof(rtv))) { |
David Woodhouse | 9f72949 | 2006-01-18 17:44:05 -0800 | [diff] [blame] | 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 | |
| 1630 | return ret; |
| 1631 | } |
| 1632 | |
| 1633 | #ifdef TIF_RESTORE_SIGMASK |
| 1634 | asmlinkage long compat_sys_pselect7(int n, compat_ulong_t __user *inp, |
| 1635 | compat_ulong_t __user *outp, compat_ulong_t __user *exp, |
| 1636 | struct compat_timespec __user *tsp, compat_sigset_t __user *sigmask, |
| 1637 | compat_size_t sigsetsize) |
| 1638 | { |
| 1639 | compat_sigset_t ss32; |
| 1640 | sigset_t ksigmask, sigsaved; |
Andrew Morton | cb82a6c | 2006-02-01 03:04:49 -0800 | [diff] [blame] | 1641 | s64 timeout = MAX_SCHEDULE_TIMEOUT; |
David Woodhouse | 9f72949 | 2006-01-18 17:44:05 -0800 | [diff] [blame] | 1642 | struct compat_timespec ts; |
| 1643 | int ret; |
| 1644 | |
| 1645 | if (tsp) { |
| 1646 | if (copy_from_user(&ts, tsp, sizeof(ts))) |
| 1647 | return -EFAULT; |
| 1648 | |
| 1649 | if (ts.tv_sec < 0 || ts.tv_nsec < 0) |
| 1650 | return -EINVAL; |
| 1651 | } |
| 1652 | |
| 1653 | if (sigmask) { |
| 1654 | if (sigsetsize != sizeof(compat_sigset_t)) |
| 1655 | return -EINVAL; |
| 1656 | if (copy_from_user(&ss32, sigmask, sizeof(ss32))) |
| 1657 | return -EFAULT; |
| 1658 | sigset_from_compat(&ksigmask, &ss32); |
| 1659 | |
| 1660 | sigdelsetmask(&ksigmask, sigmask(SIGKILL)|sigmask(SIGSTOP)); |
| 1661 | sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved); |
| 1662 | } |
| 1663 | |
| 1664 | do { |
| 1665 | if (tsp) { |
| 1666 | if ((unsigned long)ts.tv_sec < MAX_SELECT_SECONDS) { |
Milind Arun Choudhary | 022a169 | 2007-05-08 00:29:02 -0700 | [diff] [blame] | 1667 | timeout = DIV_ROUND_UP(ts.tv_nsec, 1000000000/HZ); |
David Woodhouse | 9f72949 | 2006-01-18 17:44:05 -0800 | [diff] [blame] | 1668 | timeout += ts.tv_sec * (unsigned long)HZ; |
| 1669 | ts.tv_sec = 0; |
| 1670 | ts.tv_nsec = 0; |
| 1671 | } else { |
| 1672 | ts.tv_sec -= MAX_SELECT_SECONDS; |
| 1673 | timeout = MAX_SELECT_SECONDS * HZ; |
| 1674 | } |
| 1675 | } |
| 1676 | |
| 1677 | ret = compat_core_sys_select(n, inp, outp, exp, &timeout); |
| 1678 | |
| 1679 | } while (!ret && !timeout && tsp && (ts.tv_sec || ts.tv_nsec)); |
| 1680 | |
Heiko Carstens | 87c2b7c | 2006-11-02 22:06:58 -0800 | [diff] [blame] | 1681 | if (tsp) { |
Andrew Morton | 643a654 | 2006-02-11 17:55:52 -0800 | [diff] [blame] | 1682 | struct compat_timespec rts; |
| 1683 | |
Heiko Carstens | 87c2b7c | 2006-11-02 22:06:58 -0800 | [diff] [blame] | 1684 | if (current->personality & STICKY_TIMEOUTS) |
| 1685 | goto sticky; |
| 1686 | |
Andrew Morton | 643a654 | 2006-02-11 17:55:52 -0800 | [diff] [blame] | 1687 | rts.tv_sec = timeout / HZ; |
| 1688 | rts.tv_nsec = (timeout % HZ) * (NSEC_PER_SEC/HZ); |
| 1689 | if (rts.tv_nsec >= NSEC_PER_SEC) { |
| 1690 | rts.tv_sec++; |
| 1691 | rts.tv_nsec -= NSEC_PER_SEC; |
David Woodhouse | 9f72949 | 2006-01-18 17:44:05 -0800 | [diff] [blame] | 1692 | } |
Andrew Morton | 74910e6 | 2006-02-17 13:52:58 -0800 | [diff] [blame] | 1693 | if (compat_timespec_compare(&rts, &ts) >= 0) |
Andrew Morton | 643a654 | 2006-02-11 17:55:52 -0800 | [diff] [blame] | 1694 | rts = ts; |
Heiko Carstens | 87c2b7c | 2006-11-02 22:06:58 -0800 | [diff] [blame] | 1695 | if (copy_to_user(tsp, &rts, sizeof(rts))) { |
| 1696 | sticky: |
| 1697 | /* |
| 1698 | * If an application puts its timeval in read-only |
| 1699 | * memory, we don't want the Linux-specific update to |
| 1700 | * the timeval to cause a fault after the select has |
| 1701 | * completed successfully. However, because we're not |
| 1702 | * updating the timeval, we can't restart the system |
| 1703 | * call. |
| 1704 | */ |
| 1705 | if (ret == -ERESTARTNOHAND) |
| 1706 | ret = -EINTR; |
| 1707 | } |
David Woodhouse | 9f72949 | 2006-01-18 17:44:05 -0800 | [diff] [blame] | 1708 | } |
| 1709 | |
| 1710 | if (ret == -ERESTARTNOHAND) { |
| 1711 | /* |
| 1712 | * Don't restore the signal mask yet. Let do_signal() deliver |
| 1713 | * the signal on the way back to userspace, before the signal |
| 1714 | * mask is restored. |
| 1715 | */ |
| 1716 | if (sigmask) { |
| 1717 | memcpy(¤t->saved_sigmask, &sigsaved, |
| 1718 | sizeof(sigsaved)); |
| 1719 | set_thread_flag(TIF_RESTORE_SIGMASK); |
| 1720 | } |
| 1721 | } else if (sigmask) |
| 1722 | sigprocmask(SIG_SETMASK, &sigsaved, NULL); |
| 1723 | |
| 1724 | return ret; |
| 1725 | } |
| 1726 | |
| 1727 | asmlinkage long compat_sys_pselect6(int n, compat_ulong_t __user *inp, |
| 1728 | compat_ulong_t __user *outp, compat_ulong_t __user *exp, |
| 1729 | struct compat_timespec __user *tsp, void __user *sig) |
| 1730 | { |
| 1731 | compat_size_t sigsetsize = 0; |
| 1732 | compat_uptr_t up = 0; |
| 1733 | |
| 1734 | if (sig) { |
| 1735 | if (!access_ok(VERIFY_READ, sig, |
| 1736 | sizeof(compat_uptr_t)+sizeof(compat_size_t)) || |
| 1737 | __get_user(up, (compat_uptr_t __user *)sig) || |
| 1738 | __get_user(sigsetsize, |
| 1739 | (compat_size_t __user *)(sig+sizeof(up)))) |
| 1740 | return -EFAULT; |
| 1741 | } |
| 1742 | return compat_sys_pselect7(n, inp, outp, exp, tsp, compat_ptr(up), |
| 1743 | sigsetsize); |
| 1744 | } |
| 1745 | |
| 1746 | asmlinkage long compat_sys_ppoll(struct pollfd __user *ufds, |
| 1747 | unsigned int nfds, struct compat_timespec __user *tsp, |
| 1748 | const compat_sigset_t __user *sigmask, compat_size_t sigsetsize) |
| 1749 | { |
| 1750 | compat_sigset_t ss32; |
| 1751 | sigset_t ksigmask, sigsaved; |
| 1752 | struct compat_timespec ts; |
| 1753 | s64 timeout = -1; |
| 1754 | int ret; |
| 1755 | |
| 1756 | if (tsp) { |
| 1757 | if (copy_from_user(&ts, tsp, sizeof(ts))) |
| 1758 | return -EFAULT; |
| 1759 | |
| 1760 | /* We assume that ts.tv_sec is always lower than |
| 1761 | the number of seconds that can be expressed in |
| 1762 | an s64. Otherwise the compiler bitches at us */ |
Milind Arun Choudhary | 022a169 | 2007-05-08 00:29:02 -0700 | [diff] [blame] | 1763 | timeout = DIV_ROUND_UP(ts.tv_nsec, 1000000000/HZ); |
David Woodhouse | 9f72949 | 2006-01-18 17:44:05 -0800 | [diff] [blame] | 1764 | timeout += ts.tv_sec * HZ; |
| 1765 | } |
| 1766 | |
| 1767 | if (sigmask) { |
Alexey Dobriyan | 3835a9b | 2006-05-15 09:44:27 -0700 | [diff] [blame] | 1768 | if (sigsetsize != sizeof(compat_sigset_t)) |
David Woodhouse | 9f72949 | 2006-01-18 17:44:05 -0800 | [diff] [blame] | 1769 | return -EINVAL; |
| 1770 | if (copy_from_user(&ss32, sigmask, sizeof(ss32))) |
| 1771 | return -EFAULT; |
| 1772 | sigset_from_compat(&ksigmask, &ss32); |
| 1773 | |
| 1774 | sigdelsetmask(&ksigmask, sigmask(SIGKILL)|sigmask(SIGSTOP)); |
| 1775 | sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved); |
| 1776 | } |
| 1777 | |
| 1778 | ret = do_sys_poll(ufds, nfds, &timeout); |
| 1779 | |
| 1780 | /* We can restart this syscall, usually */ |
| 1781 | if (ret == -EINTR) { |
| 1782 | /* |
| 1783 | * Don't restore the signal mask yet. Let do_signal() deliver |
| 1784 | * the signal on the way back to userspace, before the signal |
| 1785 | * mask is restored. |
| 1786 | */ |
| 1787 | if (sigmask) { |
| 1788 | memcpy(¤t->saved_sigmask, &sigsaved, |
| 1789 | sizeof(sigsaved)); |
| 1790 | set_thread_flag(TIF_RESTORE_SIGMASK); |
| 1791 | } |
| 1792 | ret = -ERESTARTNOHAND; |
| 1793 | } else if (sigmask) |
| 1794 | sigprocmask(SIG_SETMASK, &sigsaved, NULL); |
| 1795 | |
| 1796 | if (tsp && timeout >= 0) { |
Andrew Morton | 643a654 | 2006-02-11 17:55:52 -0800 | [diff] [blame] | 1797 | struct compat_timespec rts; |
| 1798 | |
David Woodhouse | 9f72949 | 2006-01-18 17:44:05 -0800 | [diff] [blame] | 1799 | if (current->personality & STICKY_TIMEOUTS) |
| 1800 | goto sticky; |
| 1801 | /* Yes, we know it's actually an s64, but it's also positive. */ |
Andrew Morton | 643a654 | 2006-02-11 17:55:52 -0800 | [diff] [blame] | 1802 | rts.tv_nsec = jiffies_to_usecs(do_div((*(u64*)&timeout), HZ)) * |
| 1803 | 1000; |
| 1804 | rts.tv_sec = timeout; |
Andrew Morton | 74910e6 | 2006-02-17 13:52:58 -0800 | [diff] [blame] | 1805 | if (compat_timespec_compare(&rts, &ts) >= 0) |
Andrew Morton | 643a654 | 2006-02-11 17:55:52 -0800 | [diff] [blame] | 1806 | rts = ts; |
| 1807 | if (copy_to_user(tsp, &rts, sizeof(rts))) { |
David Woodhouse | 9f72949 | 2006-01-18 17:44:05 -0800 | [diff] [blame] | 1808 | sticky: |
| 1809 | /* |
| 1810 | * If an application puts its timeval in read-only |
| 1811 | * memory, we don't want the Linux-specific update to |
| 1812 | * the timeval to cause a fault after the select has |
| 1813 | * completed successfully. However, because we're not |
| 1814 | * updating the timeval, we can't restart the system |
| 1815 | * call. |
| 1816 | */ |
| 1817 | if (ret == -ERESTARTNOHAND && timeout >= 0) |
| 1818 | ret = -EINTR; |
| 1819 | } |
| 1820 | } |
| 1821 | |
| 1822 | return ret; |
| 1823 | } |
| 1824 | #endif /* TIF_RESTORE_SIGMASK */ |
| 1825 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1826 | #if defined(CONFIG_NFSD) || defined(CONFIG_NFSD_MODULE) |
| 1827 | /* Stuff for NFS server syscalls... */ |
| 1828 | struct compat_nfsctl_svc { |
| 1829 | u16 svc32_port; |
| 1830 | s32 svc32_nthreads; |
| 1831 | }; |
| 1832 | |
| 1833 | struct compat_nfsctl_client { |
| 1834 | s8 cl32_ident[NFSCLNT_IDMAX+1]; |
| 1835 | s32 cl32_naddr; |
| 1836 | struct in_addr cl32_addrlist[NFSCLNT_ADDRMAX]; |
| 1837 | s32 cl32_fhkeytype; |
| 1838 | s32 cl32_fhkeylen; |
| 1839 | u8 cl32_fhkey[NFSCLNT_KEYMAX]; |
| 1840 | }; |
| 1841 | |
| 1842 | struct compat_nfsctl_export { |
| 1843 | char ex32_client[NFSCLNT_IDMAX+1]; |
| 1844 | char ex32_path[NFS_MAXPATHLEN+1]; |
| 1845 | compat_dev_t ex32_dev; |
| 1846 | compat_ino_t ex32_ino; |
| 1847 | compat_int_t ex32_flags; |
Stephen Rothwell | 202e597 | 2005-09-06 15:16:40 -0700 | [diff] [blame] | 1848 | __compat_uid_t ex32_anon_uid; |
| 1849 | __compat_gid_t ex32_anon_gid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1850 | }; |
| 1851 | |
| 1852 | struct compat_nfsctl_fdparm { |
| 1853 | struct sockaddr gd32_addr; |
| 1854 | s8 gd32_path[NFS_MAXPATHLEN+1]; |
| 1855 | compat_int_t gd32_version; |
| 1856 | }; |
| 1857 | |
| 1858 | struct compat_nfsctl_fsparm { |
| 1859 | struct sockaddr gd32_addr; |
| 1860 | s8 gd32_path[NFS_MAXPATHLEN+1]; |
| 1861 | compat_int_t gd32_maxlen; |
| 1862 | }; |
| 1863 | |
| 1864 | struct compat_nfsctl_arg { |
| 1865 | compat_int_t ca32_version; /* safeguard */ |
| 1866 | union { |
| 1867 | struct compat_nfsctl_svc u32_svc; |
| 1868 | struct compat_nfsctl_client u32_client; |
| 1869 | struct compat_nfsctl_export u32_export; |
| 1870 | struct compat_nfsctl_fdparm u32_getfd; |
| 1871 | struct compat_nfsctl_fsparm u32_getfs; |
| 1872 | } u; |
| 1873 | #define ca32_svc u.u32_svc |
| 1874 | #define ca32_client u.u32_client |
| 1875 | #define ca32_export u.u32_export |
| 1876 | #define ca32_getfd u.u32_getfd |
| 1877 | #define ca32_getfs u.u32_getfs |
| 1878 | }; |
| 1879 | |
| 1880 | union compat_nfsctl_res { |
| 1881 | __u8 cr32_getfh[NFS_FHSIZE]; |
| 1882 | struct knfsd_fh cr32_getfs; |
| 1883 | }; |
| 1884 | |
Lin Feng Shen | d64b1c8 | 2006-05-20 14:59:49 -0700 | [diff] [blame] | 1885 | static int compat_nfs_svc_trans(struct nfsctl_arg *karg, |
| 1886 | struct compat_nfsctl_arg __user *arg) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1887 | { |
Lin Feng Shen | d64b1c8 | 2006-05-20 14:59:49 -0700 | [diff] [blame] | 1888 | if (!access_ok(VERIFY_READ, &arg->ca32_svc, sizeof(arg->ca32_svc)) || |
| 1889 | get_user(karg->ca_version, &arg->ca32_version) || |
| 1890 | __get_user(karg->ca_svc.svc_port, &arg->ca32_svc.svc32_port) || |
| 1891 | __get_user(karg->ca_svc.svc_nthreads, |
| 1892 | &arg->ca32_svc.svc32_nthreads)) |
| 1893 | return -EFAULT; |
| 1894 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1895 | } |
| 1896 | |
Lin Feng Shen | d64b1c8 | 2006-05-20 14:59:49 -0700 | [diff] [blame] | 1897 | static int compat_nfs_clnt_trans(struct nfsctl_arg *karg, |
| 1898 | struct compat_nfsctl_arg __user *arg) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1899 | { |
Lin Feng Shen | d64b1c8 | 2006-05-20 14:59:49 -0700 | [diff] [blame] | 1900 | if (!access_ok(VERIFY_READ, &arg->ca32_client, |
| 1901 | sizeof(arg->ca32_client)) || |
| 1902 | get_user(karg->ca_version, &arg->ca32_version) || |
| 1903 | __copy_from_user(&karg->ca_client.cl_ident[0], |
| 1904 | &arg->ca32_client.cl32_ident[0], |
| 1905 | NFSCLNT_IDMAX) || |
| 1906 | __get_user(karg->ca_client.cl_naddr, |
| 1907 | &arg->ca32_client.cl32_naddr) || |
| 1908 | __copy_from_user(&karg->ca_client.cl_addrlist[0], |
| 1909 | &arg->ca32_client.cl32_addrlist[0], |
| 1910 | (sizeof(struct in_addr) * NFSCLNT_ADDRMAX)) || |
| 1911 | __get_user(karg->ca_client.cl_fhkeytype, |
| 1912 | &arg->ca32_client.cl32_fhkeytype) || |
| 1913 | __get_user(karg->ca_client.cl_fhkeylen, |
| 1914 | &arg->ca32_client.cl32_fhkeylen) || |
| 1915 | __copy_from_user(&karg->ca_client.cl_fhkey[0], |
| 1916 | &arg->ca32_client.cl32_fhkey[0], |
| 1917 | NFSCLNT_KEYMAX)) |
| 1918 | return -EFAULT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1919 | |
Lin Feng Shen | d64b1c8 | 2006-05-20 14:59:49 -0700 | [diff] [blame] | 1920 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1921 | } |
| 1922 | |
Lin Feng Shen | d64b1c8 | 2006-05-20 14:59:49 -0700 | [diff] [blame] | 1923 | static int compat_nfs_exp_trans(struct nfsctl_arg *karg, |
| 1924 | struct compat_nfsctl_arg __user *arg) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1925 | { |
Lin Feng Shen | d64b1c8 | 2006-05-20 14:59:49 -0700 | [diff] [blame] | 1926 | if (!access_ok(VERIFY_READ, &arg->ca32_export, |
| 1927 | sizeof(arg->ca32_export)) || |
| 1928 | get_user(karg->ca_version, &arg->ca32_version) || |
| 1929 | __copy_from_user(&karg->ca_export.ex_client[0], |
| 1930 | &arg->ca32_export.ex32_client[0], |
| 1931 | NFSCLNT_IDMAX) || |
| 1932 | __copy_from_user(&karg->ca_export.ex_path[0], |
| 1933 | &arg->ca32_export.ex32_path[0], |
| 1934 | NFS_MAXPATHLEN) || |
| 1935 | __get_user(karg->ca_export.ex_dev, |
| 1936 | &arg->ca32_export.ex32_dev) || |
| 1937 | __get_user(karg->ca_export.ex_ino, |
| 1938 | &arg->ca32_export.ex32_ino) || |
| 1939 | __get_user(karg->ca_export.ex_flags, |
| 1940 | &arg->ca32_export.ex32_flags) || |
| 1941 | __get_user(karg->ca_export.ex_anon_uid, |
| 1942 | &arg->ca32_export.ex32_anon_uid) || |
| 1943 | __get_user(karg->ca_export.ex_anon_gid, |
| 1944 | &arg->ca32_export.ex32_anon_gid)) |
| 1945 | return -EFAULT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1946 | SET_UID(karg->ca_export.ex_anon_uid, karg->ca_export.ex_anon_uid); |
| 1947 | SET_GID(karg->ca_export.ex_anon_gid, karg->ca_export.ex_anon_gid); |
| 1948 | |
Lin Feng Shen | d64b1c8 | 2006-05-20 14:59:49 -0700 | [diff] [blame] | 1949 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1950 | } |
| 1951 | |
Lin Feng Shen | d64b1c8 | 2006-05-20 14:59:49 -0700 | [diff] [blame] | 1952 | static int compat_nfs_getfd_trans(struct nfsctl_arg *karg, |
| 1953 | struct compat_nfsctl_arg __user *arg) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1954 | { |
Lin Feng Shen | d64b1c8 | 2006-05-20 14:59:49 -0700 | [diff] [blame] | 1955 | if (!access_ok(VERIFY_READ, &arg->ca32_getfd, |
| 1956 | sizeof(arg->ca32_getfd)) || |
| 1957 | get_user(karg->ca_version, &arg->ca32_version) || |
| 1958 | __copy_from_user(&karg->ca_getfd.gd_addr, |
| 1959 | &arg->ca32_getfd.gd32_addr, |
| 1960 | (sizeof(struct sockaddr))) || |
| 1961 | __copy_from_user(&karg->ca_getfd.gd_path, |
| 1962 | &arg->ca32_getfd.gd32_path, |
| 1963 | (NFS_MAXPATHLEN+1)) || |
| 1964 | __get_user(karg->ca_getfd.gd_version, |
| 1965 | &arg->ca32_getfd.gd32_version)) |
| 1966 | return -EFAULT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1967 | |
Lin Feng Shen | d64b1c8 | 2006-05-20 14:59:49 -0700 | [diff] [blame] | 1968 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1969 | } |
| 1970 | |
Lin Feng Shen | d64b1c8 | 2006-05-20 14:59:49 -0700 | [diff] [blame] | 1971 | static int compat_nfs_getfs_trans(struct nfsctl_arg *karg, |
| 1972 | struct compat_nfsctl_arg __user *arg) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1973 | { |
Lin Feng Shen | d64b1c8 | 2006-05-20 14:59:49 -0700 | [diff] [blame] | 1974 | if (!access_ok(VERIFY_READ,&arg->ca32_getfs,sizeof(arg->ca32_getfs)) || |
| 1975 | get_user(karg->ca_version, &arg->ca32_version) || |
| 1976 | __copy_from_user(&karg->ca_getfs.gd_addr, |
| 1977 | &arg->ca32_getfs.gd32_addr, |
| 1978 | (sizeof(struct sockaddr))) || |
| 1979 | __copy_from_user(&karg->ca_getfs.gd_path, |
| 1980 | &arg->ca32_getfs.gd32_path, |
| 1981 | (NFS_MAXPATHLEN+1)) || |
| 1982 | __get_user(karg->ca_getfs.gd_maxlen, |
| 1983 | &arg->ca32_getfs.gd32_maxlen)) |
| 1984 | return -EFAULT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1985 | |
Lin Feng Shen | d64b1c8 | 2006-05-20 14:59:49 -0700 | [diff] [blame] | 1986 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1987 | } |
| 1988 | |
| 1989 | /* This really doesn't need translations, we are only passing |
| 1990 | * back a union which contains opaque nfs file handle data. |
| 1991 | */ |
Lin Feng Shen | d64b1c8 | 2006-05-20 14:59:49 -0700 | [diff] [blame] | 1992 | static int compat_nfs_getfh_res_trans(union nfsctl_res *kres, |
| 1993 | union compat_nfsctl_res __user *res) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1994 | { |
| 1995 | int err; |
| 1996 | |
| 1997 | err = copy_to_user(res, kres, sizeof(*res)); |
| 1998 | |
| 1999 | return (err) ? -EFAULT : 0; |
| 2000 | } |
| 2001 | |
Lin Feng Shen | d64b1c8 | 2006-05-20 14:59:49 -0700 | [diff] [blame] | 2002 | asmlinkage long compat_sys_nfsservctl(int cmd, |
| 2003 | struct compat_nfsctl_arg __user *arg, |
| 2004 | union compat_nfsctl_res __user *res) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2005 | { |
| 2006 | struct nfsctl_arg *karg; |
| 2007 | union nfsctl_res *kres; |
| 2008 | mm_segment_t oldfs; |
| 2009 | int err; |
| 2010 | |
| 2011 | karg = kmalloc(sizeof(*karg), GFP_USER); |
| 2012 | kres = kmalloc(sizeof(*kres), GFP_USER); |
| 2013 | if(!karg || !kres) { |
| 2014 | err = -ENOMEM; |
| 2015 | goto done; |
| 2016 | } |
| 2017 | |
| 2018 | switch(cmd) { |
| 2019 | case NFSCTL_SVC: |
| 2020 | err = compat_nfs_svc_trans(karg, arg); |
| 2021 | break; |
| 2022 | |
| 2023 | case NFSCTL_ADDCLIENT: |
| 2024 | err = compat_nfs_clnt_trans(karg, arg); |
| 2025 | break; |
| 2026 | |
| 2027 | case NFSCTL_DELCLIENT: |
| 2028 | err = compat_nfs_clnt_trans(karg, arg); |
| 2029 | break; |
| 2030 | |
| 2031 | case NFSCTL_EXPORT: |
| 2032 | case NFSCTL_UNEXPORT: |
| 2033 | err = compat_nfs_exp_trans(karg, arg); |
| 2034 | break; |
| 2035 | |
| 2036 | case NFSCTL_GETFD: |
| 2037 | err = compat_nfs_getfd_trans(karg, arg); |
| 2038 | break; |
| 2039 | |
| 2040 | case NFSCTL_GETFS: |
| 2041 | err = compat_nfs_getfs_trans(karg, arg); |
| 2042 | break; |
| 2043 | |
| 2044 | default: |
| 2045 | err = -EINVAL; |
Peter Staubach | 57070d0 | 2006-03-25 03:08:04 -0800 | [diff] [blame] | 2046 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2047 | } |
| 2048 | |
Peter Staubach | 57070d0 | 2006-03-25 03:08:04 -0800 | [diff] [blame] | 2049 | if (err) |
| 2050 | goto done; |
| 2051 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2052 | oldfs = get_fs(); |
| 2053 | set_fs(KERNEL_DS); |
| 2054 | /* The __user pointer casts are valid because of the set_fs() */ |
| 2055 | err = sys_nfsservctl(cmd, (void __user *) karg, (void __user *) kres); |
| 2056 | set_fs(oldfs); |
| 2057 | |
| 2058 | if (err) |
| 2059 | goto done; |
| 2060 | |
| 2061 | if((cmd == NFSCTL_GETFD) || |
| 2062 | (cmd == NFSCTL_GETFS)) |
| 2063 | err = compat_nfs_getfh_res_trans(kres, res); |
| 2064 | |
| 2065 | done: |
| 2066 | kfree(karg); |
| 2067 | kfree(kres); |
| 2068 | return err; |
| 2069 | } |
| 2070 | #else /* !NFSD */ |
| 2071 | long asmlinkage compat_sys_nfsservctl(int cmd, void *notused, void *notused2) |
| 2072 | { |
| 2073 | return sys_ni_syscall(); |
| 2074 | } |
| 2075 | #endif |
Davide Libenzi | f6dfb4f | 2007-03-07 20:41:21 -0800 | [diff] [blame] | 2076 | |
| 2077 | #ifdef CONFIG_EPOLL |
| 2078 | |
| 2079 | #ifdef CONFIG_HAS_COMPAT_EPOLL_EVENT |
| 2080 | asmlinkage long compat_sys_epoll_ctl(int epfd, int op, int fd, |
| 2081 | struct compat_epoll_event __user *event) |
| 2082 | { |
| 2083 | long err = 0; |
| 2084 | struct compat_epoll_event user; |
| 2085 | struct epoll_event __user *kernel = NULL; |
| 2086 | |
| 2087 | if (event) { |
| 2088 | if (copy_from_user(&user, event, sizeof(user))) |
| 2089 | return -EFAULT; |
| 2090 | kernel = compat_alloc_user_space(sizeof(struct epoll_event)); |
| 2091 | err |= __put_user(user.events, &kernel->events); |
| 2092 | err |= __put_user(user.data, &kernel->data); |
| 2093 | } |
| 2094 | |
| 2095 | return err ? err : sys_epoll_ctl(epfd, op, fd, kernel); |
| 2096 | } |
| 2097 | |
| 2098 | |
| 2099 | asmlinkage long compat_sys_epoll_wait(int epfd, |
| 2100 | struct compat_epoll_event __user *events, |
| 2101 | int maxevents, int timeout) |
| 2102 | { |
| 2103 | long i, ret, err = 0; |
| 2104 | struct epoll_event __user *kbuf; |
| 2105 | struct epoll_event ev; |
| 2106 | |
| 2107 | if ((maxevents <= 0) || |
| 2108 | (maxevents > (INT_MAX / sizeof(struct epoll_event)))) |
| 2109 | return -EINVAL; |
| 2110 | kbuf = compat_alloc_user_space(sizeof(struct epoll_event) * maxevents); |
| 2111 | ret = sys_epoll_wait(epfd, kbuf, maxevents, timeout); |
| 2112 | for (i = 0; i < ret; i++) { |
| 2113 | err |= __get_user(ev.events, &kbuf[i].events); |
| 2114 | err |= __get_user(ev.data, &kbuf[i].data); |
| 2115 | err |= __put_user(ev.events, &events->events); |
| 2116 | err |= __put_user_unaligned(ev.data, &events->data); |
| 2117 | events++; |
| 2118 | } |
| 2119 | |
| 2120 | return err ? -EFAULT: ret; |
| 2121 | } |
| 2122 | #endif /* CONFIG_HAS_COMPAT_EPOLL_EVENT */ |
| 2123 | |
| 2124 | #ifdef TIF_RESTORE_SIGMASK |
| 2125 | asmlinkage long compat_sys_epoll_pwait(int epfd, |
| 2126 | struct compat_epoll_event __user *events, |
| 2127 | int maxevents, int timeout, |
| 2128 | const compat_sigset_t __user *sigmask, |
| 2129 | compat_size_t sigsetsize) |
| 2130 | { |
| 2131 | long err; |
| 2132 | compat_sigset_t csigmask; |
| 2133 | sigset_t ksigmask, sigsaved; |
| 2134 | |
| 2135 | /* |
| 2136 | * If the caller wants a certain signal mask to be set during the wait, |
| 2137 | * we apply it here. |
| 2138 | */ |
| 2139 | if (sigmask) { |
| 2140 | if (sigsetsize != sizeof(compat_sigset_t)) |
| 2141 | return -EINVAL; |
| 2142 | if (copy_from_user(&csigmask, sigmask, sizeof(csigmask))) |
| 2143 | return -EFAULT; |
| 2144 | sigset_from_compat(&ksigmask, &csigmask); |
| 2145 | sigdelsetmask(&ksigmask, sigmask(SIGKILL) | sigmask(SIGSTOP)); |
| 2146 | sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved); |
| 2147 | } |
| 2148 | |
| 2149 | #ifdef CONFIG_HAS_COMPAT_EPOLL_EVENT |
| 2150 | err = compat_sys_epoll_wait(epfd, events, maxevents, timeout); |
| 2151 | #else |
| 2152 | err = sys_epoll_wait(epfd, events, maxevents, timeout); |
| 2153 | #endif |
| 2154 | |
| 2155 | /* |
| 2156 | * If we changed the signal mask, we need to restore the original one. |
| 2157 | * In case we've got a signal while waiting, we do not restore the |
| 2158 | * signal mask yet, and we allow do_signal() to deliver the signal on |
| 2159 | * the way back to userspace, before the signal mask is restored. |
| 2160 | */ |
| 2161 | if (sigmask) { |
| 2162 | if (err == -EINTR) { |
| 2163 | memcpy(¤t->saved_sigmask, &sigsaved, |
| 2164 | sizeof(sigsaved)); |
| 2165 | set_thread_flag(TIF_RESTORE_SIGMASK); |
| 2166 | } else |
| 2167 | sigprocmask(SIG_SETMASK, &sigsaved, NULL); |
| 2168 | } |
| 2169 | |
| 2170 | return err; |
| 2171 | } |
| 2172 | #endif /* TIF_RESTORE_SIGMASK */ |
| 2173 | |
| 2174 | #endif /* CONFIG_EPOLL */ |