Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * linux/fs/open.c |
| 3 | * |
| 4 | * Copyright (C) 1991, 1992 Linus Torvalds |
| 5 | */ |
| 6 | |
| 7 | #include <linux/string.h> |
| 8 | #include <linux/mm.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 9 | #include <linux/file.h> |
Al Viro | 9f3acc3 | 2008-04-24 07:44:08 -0400 | [diff] [blame] | 10 | #include <linux/fdtable.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 11 | #include <linux/quotaops.h> |
Robert Love | 0eeca28 | 2005-07-12 17:06:03 -0400 | [diff] [blame] | 12 | #include <linux/fsnotify.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 13 | #include <linux/module.h> |
| 14 | #include <linux/slab.h> |
| 15 | #include <linux/tty.h> |
| 16 | #include <linux/namei.h> |
| 17 | #include <linux/backing-dev.h> |
Randy Dunlap | 16f7e0f | 2006-01-11 12:17:46 -0800 | [diff] [blame] | 18 | #include <linux/capability.h> |
Andrew G. Morgan | 086f731 | 2008-07-04 09:59:58 -0700 | [diff] [blame] | 19 | #include <linux/securebits.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 20 | #include <linux/security.h> |
| 21 | #include <linux/mount.h> |
| 22 | #include <linux/vfs.h> |
Ulrich Drepper | 5590ff0 | 2006-01-18 17:43:53 -0800 | [diff] [blame] | 23 | #include <linux/fcntl.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 24 | #include <asm/uaccess.h> |
| 25 | #include <linux/fs.h> |
Yoav Zach | ef3daed | 2005-06-23 00:09:58 -0700 | [diff] [blame] | 26 | #include <linux/personality.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 27 | #include <linux/pagemap.h> |
| 28 | #include <linux/syscalls.h> |
Dipankar Sarma | ab2af1f | 2005-09-09 13:04:13 -0700 | [diff] [blame] | 29 | #include <linux/rcupdate.h> |
Amy Griffis | 73241cc | 2005-11-03 16:00:25 +0000 | [diff] [blame] | 30 | #include <linux/audit.h> |
Amit Arora | 97ac735 | 2007-07-17 21:42:44 -0400 | [diff] [blame] | 31 | #include <linux/falloc.h> |
Al Viro | 5ad4e53 | 2009-03-29 19:50:06 -0400 | [diff] [blame] | 32 | #include <linux/fs_struct.h> |
Al Viro | b65a9cf | 2009-12-16 06:27:40 -0500 | [diff] [blame^] | 33 | #include <linux/ima.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 34 | |
Eric Paris | e81e3f4 | 2009-12-04 15:47:36 -0500 | [diff] [blame] | 35 | #include "internal.h" |
| 36 | |
David Howells | 726c334 | 2006-06-23 02:02:58 -0700 | [diff] [blame] | 37 | int vfs_statfs(struct dentry *dentry, struct kstatfs *buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 38 | { |
| 39 | int retval = -ENODEV; |
| 40 | |
David Howells | 726c334 | 2006-06-23 02:02:58 -0700 | [diff] [blame] | 41 | if (dentry) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 42 | retval = -ENOSYS; |
David Howells | 726c334 | 2006-06-23 02:02:58 -0700 | [diff] [blame] | 43 | if (dentry->d_sb->s_op->statfs) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 44 | memset(buf, 0, sizeof(*buf)); |
David Howells | 726c334 | 2006-06-23 02:02:58 -0700 | [diff] [blame] | 45 | retval = security_sb_statfs(dentry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 46 | if (retval) |
| 47 | return retval; |
David Howells | 726c334 | 2006-06-23 02:02:58 -0700 | [diff] [blame] | 48 | retval = dentry->d_sb->s_op->statfs(dentry, buf); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 49 | if (retval == 0 && buf->f_frsize == 0) |
| 50 | buf->f_frsize = buf->f_bsize; |
| 51 | } |
| 52 | } |
| 53 | return retval; |
| 54 | } |
| 55 | |
| 56 | EXPORT_SYMBOL(vfs_statfs); |
| 57 | |
David Howells | 726c334 | 2006-06-23 02:02:58 -0700 | [diff] [blame] | 58 | static int vfs_statfs_native(struct dentry *dentry, struct statfs *buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 59 | { |
| 60 | struct kstatfs st; |
| 61 | int retval; |
| 62 | |
David Howells | 726c334 | 2006-06-23 02:02:58 -0700 | [diff] [blame] | 63 | retval = vfs_statfs(dentry, &st); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 64 | if (retval) |
| 65 | return retval; |
| 66 | |
| 67 | if (sizeof(*buf) == sizeof(st)) |
| 68 | memcpy(buf, &st, sizeof(st)); |
| 69 | else { |
| 70 | if (sizeof buf->f_blocks == 4) { |
Jon Tollefson | f4a67cc | 2008-07-23 21:27:55 -0700 | [diff] [blame] | 71 | if ((st.f_blocks | st.f_bfree | st.f_bavail | |
| 72 | st.f_bsize | st.f_frsize) & |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 73 | 0xffffffff00000000ULL) |
| 74 | return -EOVERFLOW; |
| 75 | /* |
| 76 | * f_files and f_ffree may be -1; it's okay to stuff |
| 77 | * that into 32 bits |
| 78 | */ |
| 79 | if (st.f_files != -1 && |
| 80 | (st.f_files & 0xffffffff00000000ULL)) |
| 81 | return -EOVERFLOW; |
| 82 | if (st.f_ffree != -1 && |
| 83 | (st.f_ffree & 0xffffffff00000000ULL)) |
| 84 | return -EOVERFLOW; |
| 85 | } |
| 86 | |
| 87 | buf->f_type = st.f_type; |
| 88 | buf->f_bsize = st.f_bsize; |
| 89 | buf->f_blocks = st.f_blocks; |
| 90 | buf->f_bfree = st.f_bfree; |
| 91 | buf->f_bavail = st.f_bavail; |
| 92 | buf->f_files = st.f_files; |
| 93 | buf->f_ffree = st.f_ffree; |
| 94 | buf->f_fsid = st.f_fsid; |
| 95 | buf->f_namelen = st.f_namelen; |
| 96 | buf->f_frsize = st.f_frsize; |
| 97 | memset(buf->f_spare, 0, sizeof(buf->f_spare)); |
| 98 | } |
| 99 | return 0; |
| 100 | } |
| 101 | |
David Howells | 726c334 | 2006-06-23 02:02:58 -0700 | [diff] [blame] | 102 | static int vfs_statfs64(struct dentry *dentry, struct statfs64 *buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 103 | { |
| 104 | struct kstatfs st; |
| 105 | int retval; |
| 106 | |
David Howells | 726c334 | 2006-06-23 02:02:58 -0700 | [diff] [blame] | 107 | retval = vfs_statfs(dentry, &st); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 108 | if (retval) |
| 109 | return retval; |
| 110 | |
| 111 | if (sizeof(*buf) == sizeof(st)) |
| 112 | memcpy(buf, &st, sizeof(st)); |
| 113 | else { |
| 114 | buf->f_type = st.f_type; |
| 115 | buf->f_bsize = st.f_bsize; |
| 116 | buf->f_blocks = st.f_blocks; |
| 117 | buf->f_bfree = st.f_bfree; |
| 118 | buf->f_bavail = st.f_bavail; |
| 119 | buf->f_files = st.f_files; |
| 120 | buf->f_ffree = st.f_ffree; |
| 121 | buf->f_fsid = st.f_fsid; |
| 122 | buf->f_namelen = st.f_namelen; |
| 123 | buf->f_frsize = st.f_frsize; |
| 124 | memset(buf->f_spare, 0, sizeof(buf->f_spare)); |
| 125 | } |
| 126 | return 0; |
| 127 | } |
| 128 | |
Heiko Carstens | bdc480e | 2009-01-14 14:14:12 +0100 | [diff] [blame] | 129 | SYSCALL_DEFINE2(statfs, const char __user *, pathname, struct statfs __user *, buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 130 | { |
Al Viro | 2d8f303 | 2008-07-22 09:59:21 -0400 | [diff] [blame] | 131 | struct path path; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 132 | int error; |
| 133 | |
Al Viro | 2d8f303 | 2008-07-22 09:59:21 -0400 | [diff] [blame] | 134 | error = user_path(pathname, &path); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 135 | if (!error) { |
| 136 | struct statfs tmp; |
Al Viro | 2d8f303 | 2008-07-22 09:59:21 -0400 | [diff] [blame] | 137 | error = vfs_statfs_native(path.dentry, &tmp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 138 | if (!error && copy_to_user(buf, &tmp, sizeof(tmp))) |
| 139 | error = -EFAULT; |
Al Viro | 2d8f303 | 2008-07-22 09:59:21 -0400 | [diff] [blame] | 140 | path_put(&path); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 141 | } |
| 142 | return error; |
| 143 | } |
| 144 | |
Heiko Carstens | bdc480e | 2009-01-14 14:14:12 +0100 | [diff] [blame] | 145 | SYSCALL_DEFINE3(statfs64, const char __user *, pathname, size_t, sz, struct statfs64 __user *, buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 146 | { |
Al Viro | 2d8f303 | 2008-07-22 09:59:21 -0400 | [diff] [blame] | 147 | struct path path; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 148 | long error; |
| 149 | |
| 150 | if (sz != sizeof(*buf)) |
| 151 | return -EINVAL; |
Al Viro | 2d8f303 | 2008-07-22 09:59:21 -0400 | [diff] [blame] | 152 | error = user_path(pathname, &path); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 153 | if (!error) { |
| 154 | struct statfs64 tmp; |
Al Viro | 2d8f303 | 2008-07-22 09:59:21 -0400 | [diff] [blame] | 155 | error = vfs_statfs64(path.dentry, &tmp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 156 | if (!error && copy_to_user(buf, &tmp, sizeof(tmp))) |
| 157 | error = -EFAULT; |
Al Viro | 2d8f303 | 2008-07-22 09:59:21 -0400 | [diff] [blame] | 158 | path_put(&path); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 159 | } |
| 160 | return error; |
| 161 | } |
| 162 | |
Heiko Carstens | bdc480e | 2009-01-14 14:14:12 +0100 | [diff] [blame] | 163 | SYSCALL_DEFINE2(fstatfs, unsigned int, fd, struct statfs __user *, buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 164 | { |
| 165 | struct file * file; |
| 166 | struct statfs tmp; |
| 167 | int error; |
| 168 | |
| 169 | error = -EBADF; |
| 170 | file = fget(fd); |
| 171 | if (!file) |
| 172 | goto out; |
Josef "Jeff" Sipek | 0f7fc9e | 2006-12-08 02:36:35 -0800 | [diff] [blame] | 173 | error = vfs_statfs_native(file->f_path.dentry, &tmp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 174 | if (!error && copy_to_user(buf, &tmp, sizeof(tmp))) |
| 175 | error = -EFAULT; |
| 176 | fput(file); |
| 177 | out: |
| 178 | return error; |
| 179 | } |
| 180 | |
Heiko Carstens | 257ac26 | 2009-01-14 14:14:13 +0100 | [diff] [blame] | 181 | SYSCALL_DEFINE3(fstatfs64, unsigned int, fd, size_t, sz, struct statfs64 __user *, buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 182 | { |
| 183 | struct file * file; |
| 184 | struct statfs64 tmp; |
| 185 | int error; |
| 186 | |
| 187 | if (sz != sizeof(*buf)) |
| 188 | return -EINVAL; |
| 189 | |
| 190 | error = -EBADF; |
| 191 | file = fget(fd); |
| 192 | if (!file) |
| 193 | goto out; |
Josef "Jeff" Sipek | 0f7fc9e | 2006-12-08 02:36:35 -0800 | [diff] [blame] | 194 | error = vfs_statfs64(file->f_path.dentry, &tmp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 195 | if (!error && copy_to_user(buf, &tmp, sizeof(tmp))) |
| 196 | error = -EFAULT; |
| 197 | fput(file); |
| 198 | out: |
| 199 | return error; |
| 200 | } |
| 201 | |
NeilBrown | 4a30131 | 2006-01-08 01:02:39 -0800 | [diff] [blame] | 202 | int do_truncate(struct dentry *dentry, loff_t length, unsigned int time_attrs, |
| 203 | struct file *filp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 204 | { |
Amerigo Wang | 939a942 | 2009-08-20 19:29:03 -0700 | [diff] [blame] | 205 | int ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 206 | struct iattr newattrs; |
| 207 | |
| 208 | /* Not pretty: "inode->i_size" shouldn't really be signed. But it is. */ |
| 209 | if (length < 0) |
| 210 | return -EINVAL; |
| 211 | |
| 212 | newattrs.ia_size = length; |
NeilBrown | 4a30131 | 2006-01-08 01:02:39 -0800 | [diff] [blame] | 213 | newattrs.ia_valid = ATTR_SIZE | time_attrs; |
Miklos Szeredi | cc4e69d | 2005-11-07 00:59:49 -0800 | [diff] [blame] | 214 | if (filp) { |
| 215 | newattrs.ia_file = filp; |
| 216 | newattrs.ia_valid |= ATTR_FILE; |
| 217 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 218 | |
Linus Torvalds | 7b82dc0 | 2007-05-08 20:10:00 -0700 | [diff] [blame] | 219 | /* Remove suid/sgid on truncate too */ |
Amerigo Wang | 939a942 | 2009-08-20 19:29:03 -0700 | [diff] [blame] | 220 | ret = should_remove_suid(dentry); |
| 221 | if (ret) |
| 222 | newattrs.ia_valid |= ret | ATTR_FORCE; |
Linus Torvalds | 7b82dc0 | 2007-05-08 20:10:00 -0700 | [diff] [blame] | 223 | |
Jes Sorensen | 1b1dcc1 | 2006-01-09 15:59:24 -0800 | [diff] [blame] | 224 | mutex_lock(&dentry->d_inode->i_mutex); |
Amerigo Wang | 939a942 | 2009-08-20 19:29:03 -0700 | [diff] [blame] | 225 | ret = notify_change(dentry, &newattrs); |
Jes Sorensen | 1b1dcc1 | 2006-01-09 15:59:24 -0800 | [diff] [blame] | 226 | mutex_unlock(&dentry->d_inode->i_mutex); |
Amerigo Wang | 939a942 | 2009-08-20 19:29:03 -0700 | [diff] [blame] | 227 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 228 | } |
| 229 | |
Al Viro | 2d8f303 | 2008-07-22 09:59:21 -0400 | [diff] [blame] | 230 | static long do_sys_truncate(const char __user *pathname, loff_t length) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 231 | { |
Al Viro | 2d8f303 | 2008-07-22 09:59:21 -0400 | [diff] [blame] | 232 | struct path path; |
| 233 | struct inode *inode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 234 | int error; |
| 235 | |
| 236 | error = -EINVAL; |
| 237 | if (length < 0) /* sorry, but loff_t says... */ |
| 238 | goto out; |
| 239 | |
Al Viro | 2d8f303 | 2008-07-22 09:59:21 -0400 | [diff] [blame] | 240 | error = user_path(pathname, &path); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 241 | if (error) |
| 242 | goto out; |
Al Viro | 2d8f303 | 2008-07-22 09:59:21 -0400 | [diff] [blame] | 243 | inode = path.dentry->d_inode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 244 | |
| 245 | /* For directories it's -EISDIR, for other non-regulars - -EINVAL */ |
| 246 | error = -EISDIR; |
| 247 | if (S_ISDIR(inode->i_mode)) |
| 248 | goto dput_and_out; |
| 249 | |
| 250 | error = -EINVAL; |
| 251 | if (!S_ISREG(inode->i_mode)) |
| 252 | goto dput_and_out; |
| 253 | |
Al Viro | 2d8f303 | 2008-07-22 09:59:21 -0400 | [diff] [blame] | 254 | error = mnt_want_write(path.mnt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 255 | if (error) |
| 256 | goto dput_and_out; |
| 257 | |
Al Viro | 256984a | 2008-07-22 08:09:30 -0400 | [diff] [blame] | 258 | error = inode_permission(inode, MAY_WRITE); |
Dave Hansen | 9ac9b84 | 2008-02-15 14:37:52 -0800 | [diff] [blame] | 259 | if (error) |
| 260 | goto mnt_drop_write_and_out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 261 | |
| 262 | error = -EPERM; |
Miklos Szeredi | c82e42d | 2008-06-24 16:50:12 +0200 | [diff] [blame] | 263 | if (IS_APPEND(inode)) |
Dave Hansen | 9ac9b84 | 2008-02-15 14:37:52 -0800 | [diff] [blame] | 264 | goto mnt_drop_write_and_out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 265 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 266 | error = get_write_access(inode); |
| 267 | if (error) |
Dave Hansen | 9ac9b84 | 2008-02-15 14:37:52 -0800 | [diff] [blame] | 268 | goto mnt_drop_write_and_out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 269 | |
david m. richter | 9700382 | 2007-07-31 00:39:12 -0700 | [diff] [blame] | 270 | /* |
| 271 | * Make sure that there are no leases. get_write_access() protects |
| 272 | * against the truncate racing with a lease-granting setlease(). |
| 273 | */ |
| 274 | error = break_lease(inode, FMODE_WRITE); |
| 275 | if (error) |
| 276 | goto put_write_and_out; |
| 277 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 278 | error = locks_verify_truncate(inode, NULL, length); |
Kentaro Takeda | be6d3e5 | 2008-12-17 13:24:15 +0900 | [diff] [blame] | 279 | if (!error) |
| 280 | error = security_path_truncate(&path, length, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 281 | if (!error) { |
Jan Kara | 9e3509e | 2009-01-26 16:45:12 +0100 | [diff] [blame] | 282 | vfs_dq_init(inode); |
Al Viro | 2d8f303 | 2008-07-22 09:59:21 -0400 | [diff] [blame] | 283 | error = do_truncate(path.dentry, length, 0, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 284 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 285 | |
david m. richter | 9700382 | 2007-07-31 00:39:12 -0700 | [diff] [blame] | 286 | put_write_and_out: |
| 287 | put_write_access(inode); |
Dave Hansen | 9ac9b84 | 2008-02-15 14:37:52 -0800 | [diff] [blame] | 288 | mnt_drop_write_and_out: |
Al Viro | 2d8f303 | 2008-07-22 09:59:21 -0400 | [diff] [blame] | 289 | mnt_drop_write(path.mnt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 290 | dput_and_out: |
Al Viro | 2d8f303 | 2008-07-22 09:59:21 -0400 | [diff] [blame] | 291 | path_put(&path); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 292 | out: |
| 293 | return error; |
| 294 | } |
| 295 | |
Heiko Carstens | 4fd8da8 | 2009-09-23 17:49:55 +0200 | [diff] [blame] | 296 | SYSCALL_DEFINE2(truncate, const char __user *, path, long, length) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 297 | { |
Heiko Carstens | 4fd8da8 | 2009-09-23 17:49:55 +0200 | [diff] [blame] | 298 | return do_sys_truncate(path, length); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 299 | } |
| 300 | |
Matt Mackall | b01ec0e | 2006-01-08 01:05:20 -0800 | [diff] [blame] | 301 | static long do_sys_ftruncate(unsigned int fd, loff_t length, int small) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 302 | { |
| 303 | struct inode * inode; |
| 304 | struct dentry *dentry; |
| 305 | struct file * file; |
| 306 | int error; |
| 307 | |
| 308 | error = -EINVAL; |
| 309 | if (length < 0) |
| 310 | goto out; |
| 311 | error = -EBADF; |
| 312 | file = fget(fd); |
| 313 | if (!file) |
| 314 | goto out; |
| 315 | |
| 316 | /* explicitly opened as large or we are on 64-bit box */ |
| 317 | if (file->f_flags & O_LARGEFILE) |
| 318 | small = 0; |
| 319 | |
Josef "Jeff" Sipek | 0f7fc9e | 2006-12-08 02:36:35 -0800 | [diff] [blame] | 320 | dentry = file->f_path.dentry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 321 | inode = dentry->d_inode; |
| 322 | error = -EINVAL; |
| 323 | if (!S_ISREG(inode->i_mode) || !(file->f_mode & FMODE_WRITE)) |
| 324 | goto out_putf; |
| 325 | |
| 326 | error = -EINVAL; |
| 327 | /* Cannot ftruncate over 2^31 bytes without large file support */ |
| 328 | if (small && length > MAX_NON_LFS) |
| 329 | goto out_putf; |
| 330 | |
| 331 | error = -EPERM; |
| 332 | if (IS_APPEND(inode)) |
| 333 | goto out_putf; |
| 334 | |
| 335 | error = locks_verify_truncate(inode, file, length); |
| 336 | if (!error) |
Kentaro Takeda | be6d3e5 | 2008-12-17 13:24:15 +0900 | [diff] [blame] | 337 | error = security_path_truncate(&file->f_path, length, |
| 338 | ATTR_MTIME|ATTR_CTIME); |
| 339 | if (!error) |
Peter Staubach | 6e656be | 2006-06-25 05:48:36 -0700 | [diff] [blame] | 340 | error = do_truncate(dentry, length, ATTR_MTIME|ATTR_CTIME, file); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 341 | out_putf: |
| 342 | fput(file); |
| 343 | out: |
| 344 | return error; |
| 345 | } |
| 346 | |
Heiko Carstens | bdc480e | 2009-01-14 14:14:12 +0100 | [diff] [blame] | 347 | SYSCALL_DEFINE2(ftruncate, unsigned int, fd, unsigned long, length) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 348 | { |
Linus Torvalds | 0a489cb | 2006-04-18 13:02:48 -0700 | [diff] [blame] | 349 | long ret = do_sys_ftruncate(fd, length, 1); |
Linus Torvalds | 385910f | 2006-04-18 13:22:59 -0700 | [diff] [blame] | 350 | /* avoid REGPARM breakage on x86: */ |
Roland McGrath | 54a0151 | 2008-04-10 15:37:38 -0700 | [diff] [blame] | 351 | asmlinkage_protect(2, ret, fd, length); |
Linus Torvalds | 0a489cb | 2006-04-18 13:02:48 -0700 | [diff] [blame] | 352 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 353 | } |
| 354 | |
| 355 | /* LFS versions of truncate are only needed on 32 bit machines */ |
| 356 | #if BITS_PER_LONG == 32 |
Heiko Carstens | 6673e0c | 2009-01-14 14:14:02 +0100 | [diff] [blame] | 357 | SYSCALL_DEFINE(truncate64)(const char __user * path, loff_t length) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 358 | { |
| 359 | return do_sys_truncate(path, length); |
| 360 | } |
Heiko Carstens | 6673e0c | 2009-01-14 14:14:02 +0100 | [diff] [blame] | 361 | #ifdef CONFIG_HAVE_SYSCALL_WRAPPERS |
| 362 | asmlinkage long SyS_truncate64(long path, loff_t length) |
| 363 | { |
| 364 | return SYSC_truncate64((const char __user *) path, length); |
| 365 | } |
| 366 | SYSCALL_ALIAS(sys_truncate64, SyS_truncate64); |
| 367 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 368 | |
Heiko Carstens | 6673e0c | 2009-01-14 14:14:02 +0100 | [diff] [blame] | 369 | SYSCALL_DEFINE(ftruncate64)(unsigned int fd, loff_t length) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 370 | { |
Linus Torvalds | 0a489cb | 2006-04-18 13:02:48 -0700 | [diff] [blame] | 371 | long ret = do_sys_ftruncate(fd, length, 0); |
Linus Torvalds | 385910f | 2006-04-18 13:22:59 -0700 | [diff] [blame] | 372 | /* avoid REGPARM breakage on x86: */ |
Roland McGrath | 54a0151 | 2008-04-10 15:37:38 -0700 | [diff] [blame] | 373 | asmlinkage_protect(2, ret, fd, length); |
Linus Torvalds | 0a489cb | 2006-04-18 13:02:48 -0700 | [diff] [blame] | 374 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 375 | } |
Heiko Carstens | 6673e0c | 2009-01-14 14:14:02 +0100 | [diff] [blame] | 376 | #ifdef CONFIG_HAVE_SYSCALL_WRAPPERS |
| 377 | asmlinkage long SyS_ftruncate64(long fd, loff_t length) |
| 378 | { |
| 379 | return SYSC_ftruncate64((unsigned int) fd, length); |
| 380 | } |
| 381 | SYSCALL_ALIAS(sys_ftruncate64, SyS_ftruncate64); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 382 | #endif |
Heiko Carstens | 6673e0c | 2009-01-14 14:14:02 +0100 | [diff] [blame] | 383 | #endif /* BITS_PER_LONG == 32 */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 384 | |
Ankit Jain | 3e63cbb | 2009-06-19 14:28:07 -0400 | [diff] [blame] | 385 | |
| 386 | int do_fallocate(struct file *file, int mode, loff_t offset, loff_t len) |
Amit Arora | 97ac735 | 2007-07-17 21:42:44 -0400 | [diff] [blame] | 387 | { |
Ankit Jain | 3e63cbb | 2009-06-19 14:28:07 -0400 | [diff] [blame] | 388 | struct inode *inode = file->f_path.dentry->d_inode; |
| 389 | long ret; |
Amit Arora | 97ac735 | 2007-07-17 21:42:44 -0400 | [diff] [blame] | 390 | |
| 391 | if (offset < 0 || len <= 0) |
Ankit Jain | 3e63cbb | 2009-06-19 14:28:07 -0400 | [diff] [blame] | 392 | return -EINVAL; |
Amit Arora | 97ac735 | 2007-07-17 21:42:44 -0400 | [diff] [blame] | 393 | |
| 394 | /* Return error if mode is not supported */ |
Amit Arora | 97ac735 | 2007-07-17 21:42:44 -0400 | [diff] [blame] | 395 | if (mode && !(mode & FALLOC_FL_KEEP_SIZE)) |
Ankit Jain | 3e63cbb | 2009-06-19 14:28:07 -0400 | [diff] [blame] | 396 | return -EOPNOTSUPP; |
Amit Arora | 97ac735 | 2007-07-17 21:42:44 -0400 | [diff] [blame] | 397 | |
Amit Arora | 97ac735 | 2007-07-17 21:42:44 -0400 | [diff] [blame] | 398 | if (!(file->f_mode & FMODE_WRITE)) |
Ankit Jain | 3e63cbb | 2009-06-19 14:28:07 -0400 | [diff] [blame] | 399 | return -EBADF; |
Amit Arora | 97ac735 | 2007-07-17 21:42:44 -0400 | [diff] [blame] | 400 | /* |
| 401 | * Revalidate the write permissions, in case security policy has |
| 402 | * changed since the files were opened. |
| 403 | */ |
| 404 | ret = security_file_permission(file, MAY_WRITE); |
| 405 | if (ret) |
Ankit Jain | 3e63cbb | 2009-06-19 14:28:07 -0400 | [diff] [blame] | 406 | return ret; |
Amit Arora | 97ac735 | 2007-07-17 21:42:44 -0400 | [diff] [blame] | 407 | |
Amit Arora | 97ac735 | 2007-07-17 21:42:44 -0400 | [diff] [blame] | 408 | if (S_ISFIFO(inode->i_mode)) |
Ankit Jain | 3e63cbb | 2009-06-19 14:28:07 -0400 | [diff] [blame] | 409 | return -ESPIPE; |
Amit Arora | 97ac735 | 2007-07-17 21:42:44 -0400 | [diff] [blame] | 410 | |
Amit Arora | 97ac735 | 2007-07-17 21:42:44 -0400 | [diff] [blame] | 411 | /* |
| 412 | * Let individual file system decide if it supports preallocation |
| 413 | * for directories or not. |
| 414 | */ |
| 415 | if (!S_ISREG(inode->i_mode) && !S_ISDIR(inode->i_mode)) |
Ankit Jain | 3e63cbb | 2009-06-19 14:28:07 -0400 | [diff] [blame] | 416 | return -ENODEV; |
Amit Arora | 97ac735 | 2007-07-17 21:42:44 -0400 | [diff] [blame] | 417 | |
Amit Arora | 97ac735 | 2007-07-17 21:42:44 -0400 | [diff] [blame] | 418 | /* Check for wrap through zero too */ |
| 419 | if (((offset + len) > inode->i_sb->s_maxbytes) || ((offset + len) < 0)) |
Ankit Jain | 3e63cbb | 2009-06-19 14:28:07 -0400 | [diff] [blame] | 420 | return -EFBIG; |
Amit Arora | 97ac735 | 2007-07-17 21:42:44 -0400 | [diff] [blame] | 421 | |
Ankit Jain | 3e63cbb | 2009-06-19 14:28:07 -0400 | [diff] [blame] | 422 | if (!inode->i_op->fallocate) |
| 423 | return -EOPNOTSUPP; |
Amit Arora | 97ac735 | 2007-07-17 21:42:44 -0400 | [diff] [blame] | 424 | |
Ankit Jain | 3e63cbb | 2009-06-19 14:28:07 -0400 | [diff] [blame] | 425 | return inode->i_op->fallocate(inode, mode, offset, len); |
Amit Arora | 97ac735 | 2007-07-17 21:42:44 -0400 | [diff] [blame] | 426 | } |
Ankit Jain | 3e63cbb | 2009-06-19 14:28:07 -0400 | [diff] [blame] | 427 | |
| 428 | SYSCALL_DEFINE(fallocate)(int fd, int mode, loff_t offset, loff_t len) |
| 429 | { |
| 430 | struct file *file; |
| 431 | int error = -EBADF; |
| 432 | |
| 433 | file = fget(fd); |
| 434 | if (file) { |
| 435 | error = do_fallocate(file, mode, offset, len); |
| 436 | fput(file); |
| 437 | } |
| 438 | |
| 439 | return error; |
| 440 | } |
| 441 | |
Heiko Carstens | 6673e0c | 2009-01-14 14:14:02 +0100 | [diff] [blame] | 442 | #ifdef CONFIG_HAVE_SYSCALL_WRAPPERS |
| 443 | asmlinkage long SyS_fallocate(long fd, long mode, loff_t offset, loff_t len) |
| 444 | { |
| 445 | return SYSC_fallocate((int)fd, (int)mode, offset, len); |
| 446 | } |
| 447 | SYSCALL_ALIAS(sys_fallocate, SyS_fallocate); |
| 448 | #endif |
Amit Arora | 97ac735 | 2007-07-17 21:42:44 -0400 | [diff] [blame] | 449 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 450 | /* |
| 451 | * access() needs to use the real uid/gid, not the effective uid/gid. |
| 452 | * We do this by temporarily clearing all FS-related capabilities and |
| 453 | * switching the fsuid/fsgid around to the real ones. |
| 454 | */ |
Heiko Carstens | 6559eed8 | 2009-01-14 14:14:32 +0100 | [diff] [blame] | 455 | SYSCALL_DEFINE3(faccessat, int, dfd, const char __user *, filename, int, mode) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 456 | { |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 457 | const struct cred *old_cred; |
| 458 | struct cred *override_cred; |
Al Viro | 2d8f303 | 2008-07-22 09:59:21 -0400 | [diff] [blame] | 459 | struct path path; |
Al Viro | 256984a | 2008-07-22 08:09:30 -0400 | [diff] [blame] | 460 | struct inode *inode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 461 | int res; |
| 462 | |
| 463 | if (mode & ~S_IRWXO) /* where's F_OK, X_OK, W_OK, R_OK? */ |
| 464 | return -EINVAL; |
| 465 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 466 | override_cred = prepare_creds(); |
| 467 | if (!override_cred) |
| 468 | return -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 469 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 470 | override_cred->fsuid = override_cred->uid; |
| 471 | override_cred->fsgid = override_cred->gid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 472 | |
Andrew G. Morgan | 086f731 | 2008-07-04 09:59:58 -0700 | [diff] [blame] | 473 | if (!issecure(SECURE_NO_SETUID_FIXUP)) { |
David Howells | 1cdcbec | 2008-11-14 10:39:14 +1100 | [diff] [blame] | 474 | /* Clear the capabilities if we switch to a non-root user */ |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 475 | if (override_cred->uid) |
| 476 | cap_clear(override_cred->cap_effective); |
Andrew G. Morgan | 086f731 | 2008-07-04 09:59:58 -0700 | [diff] [blame] | 477 | else |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 478 | override_cred->cap_effective = |
| 479 | override_cred->cap_permitted; |
Andrew G. Morgan | 086f731 | 2008-07-04 09:59:58 -0700 | [diff] [blame] | 480 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 481 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 482 | old_cred = override_creds(override_cred); |
| 483 | |
Al Viro | 2d8f303 | 2008-07-22 09:59:21 -0400 | [diff] [blame] | 484 | res = user_path_at(dfd, filename, LOOKUP_FOLLOW, &path); |
Dave Hansen | 6902d92 | 2006-09-30 23:29:01 -0700 | [diff] [blame] | 485 | if (res) |
| 486 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 487 | |
Al Viro | 2d8f303 | 2008-07-22 09:59:21 -0400 | [diff] [blame] | 488 | inode = path.dentry->d_inode; |
Al Viro | 256984a | 2008-07-22 08:09:30 -0400 | [diff] [blame] | 489 | |
| 490 | if ((mode & MAY_EXEC) && S_ISREG(inode->i_mode)) { |
Al Viro | 3052447 | 2008-07-22 00:02:33 -0400 | [diff] [blame] | 491 | /* |
| 492 | * MAY_EXEC on regular files is denied if the fs is mounted |
| 493 | * with the "noexec" flag. |
| 494 | */ |
| 495 | res = -EACCES; |
Al Viro | 2d8f303 | 2008-07-22 09:59:21 -0400 | [diff] [blame] | 496 | if (path.mnt->mnt_flags & MNT_NOEXEC) |
Al Viro | 3052447 | 2008-07-22 00:02:33 -0400 | [diff] [blame] | 497 | goto out_path_release; |
| 498 | } |
| 499 | |
Al Viro | 256984a | 2008-07-22 08:09:30 -0400 | [diff] [blame] | 500 | res = inode_permission(inode, mode | MAY_ACCESS); |
Dave Hansen | 6902d92 | 2006-09-30 23:29:01 -0700 | [diff] [blame] | 501 | /* SuS v2 requires we report a read only fs too */ |
Al Viro | 256984a | 2008-07-22 08:09:30 -0400 | [diff] [blame] | 502 | if (res || !(mode & S_IWOTH) || special_file(inode->i_mode)) |
Dave Hansen | 6902d92 | 2006-09-30 23:29:01 -0700 | [diff] [blame] | 503 | goto out_path_release; |
Dave Hansen | 2f676cb | 2008-02-15 14:37:55 -0800 | [diff] [blame] | 504 | /* |
| 505 | * This is a rare case where using __mnt_is_readonly() |
| 506 | * is OK without a mnt_want/drop_write() pair. Since |
| 507 | * no actual write to the fs is performed here, we do |
| 508 | * not need to telegraph to that to anyone. |
| 509 | * |
| 510 | * By doing this, we accept that this access is |
| 511 | * inherently racy and know that the fs may change |
| 512 | * state before we even see this result. |
| 513 | */ |
Al Viro | 2d8f303 | 2008-07-22 09:59:21 -0400 | [diff] [blame] | 514 | if (__mnt_is_readonly(path.mnt)) |
Dave Hansen | 6902d92 | 2006-09-30 23:29:01 -0700 | [diff] [blame] | 515 | res = -EROFS; |
| 516 | |
| 517 | out_path_release: |
Al Viro | 2d8f303 | 2008-07-22 09:59:21 -0400 | [diff] [blame] | 518 | path_put(&path); |
Dave Hansen | 6902d92 | 2006-09-30 23:29:01 -0700 | [diff] [blame] | 519 | out: |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 520 | revert_creds(old_cred); |
| 521 | put_cred(override_cred); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 522 | return res; |
| 523 | } |
| 524 | |
Heiko Carstens | ca013e9 | 2009-01-14 14:14:19 +0100 | [diff] [blame] | 525 | SYSCALL_DEFINE2(access, const char __user *, filename, int, mode) |
Ulrich Drepper | 5590ff0 | 2006-01-18 17:43:53 -0800 | [diff] [blame] | 526 | { |
| 527 | return sys_faccessat(AT_FDCWD, filename, mode); |
| 528 | } |
| 529 | |
Heiko Carstens | 3cdad42 | 2009-01-14 14:14:22 +0100 | [diff] [blame] | 530 | SYSCALL_DEFINE1(chdir, const char __user *, filename) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 531 | { |
Al Viro | 2d8f303 | 2008-07-22 09:59:21 -0400 | [diff] [blame] | 532 | struct path path; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 533 | int error; |
| 534 | |
Al Viro | 2d8f303 | 2008-07-22 09:59:21 -0400 | [diff] [blame] | 535 | error = user_path_dir(filename, &path); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 536 | if (error) |
| 537 | goto out; |
| 538 | |
Al Viro | 2d8f303 | 2008-07-22 09:59:21 -0400 | [diff] [blame] | 539 | error = inode_permission(path.dentry->d_inode, MAY_EXEC | MAY_ACCESS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 540 | if (error) |
| 541 | goto dput_and_out; |
| 542 | |
Al Viro | 2d8f303 | 2008-07-22 09:59:21 -0400 | [diff] [blame] | 543 | set_fs_pwd(current->fs, &path); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 544 | |
| 545 | dput_and_out: |
Al Viro | 2d8f303 | 2008-07-22 09:59:21 -0400 | [diff] [blame] | 546 | path_put(&path); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 547 | out: |
| 548 | return error; |
| 549 | } |
| 550 | |
Heiko Carstens | 3cdad42 | 2009-01-14 14:14:22 +0100 | [diff] [blame] | 551 | SYSCALL_DEFINE1(fchdir, unsigned int, fd) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 552 | { |
| 553 | struct file *file; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 554 | struct inode *inode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 555 | int error; |
| 556 | |
| 557 | error = -EBADF; |
| 558 | file = fget(fd); |
| 559 | if (!file) |
| 560 | goto out; |
| 561 | |
Jan Blunck | ac748a0 | 2008-02-14 19:34:39 -0800 | [diff] [blame] | 562 | inode = file->f_path.dentry->d_inode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 563 | |
| 564 | error = -ENOTDIR; |
| 565 | if (!S_ISDIR(inode->i_mode)) |
| 566 | goto out_putf; |
| 567 | |
Al Viro | 256984a | 2008-07-22 08:09:30 -0400 | [diff] [blame] | 568 | error = inode_permission(inode, MAY_EXEC | MAY_ACCESS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 569 | if (!error) |
Jan Blunck | ac748a0 | 2008-02-14 19:34:39 -0800 | [diff] [blame] | 570 | set_fs_pwd(current->fs, &file->f_path); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 571 | out_putf: |
| 572 | fput(file); |
| 573 | out: |
| 574 | return error; |
| 575 | } |
| 576 | |
Heiko Carstens | 3480b25 | 2009-01-14 14:14:16 +0100 | [diff] [blame] | 577 | SYSCALL_DEFINE1(chroot, const char __user *, filename) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 578 | { |
Al Viro | 2d8f303 | 2008-07-22 09:59:21 -0400 | [diff] [blame] | 579 | struct path path; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 580 | int error; |
| 581 | |
Al Viro | 2d8f303 | 2008-07-22 09:59:21 -0400 | [diff] [blame] | 582 | error = user_path_dir(filename, &path); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 583 | if (error) |
| 584 | goto out; |
| 585 | |
Al Viro | 2d8f303 | 2008-07-22 09:59:21 -0400 | [diff] [blame] | 586 | error = inode_permission(path.dentry->d_inode, MAY_EXEC | MAY_ACCESS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 587 | if (error) |
| 588 | goto dput_and_out; |
| 589 | |
| 590 | error = -EPERM; |
| 591 | if (!capable(CAP_SYS_CHROOT)) |
| 592 | goto dput_and_out; |
Tetsuo Handa | 8b8efb4 | 2009-10-04 21:49:48 +0900 | [diff] [blame] | 593 | error = security_path_chroot(&path); |
| 594 | if (error) |
| 595 | goto dput_and_out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 596 | |
Al Viro | 2d8f303 | 2008-07-22 09:59:21 -0400 | [diff] [blame] | 597 | set_fs_root(current->fs, &path); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 598 | error = 0; |
| 599 | dput_and_out: |
Al Viro | 2d8f303 | 2008-07-22 09:59:21 -0400 | [diff] [blame] | 600 | path_put(&path); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 601 | out: |
| 602 | return error; |
| 603 | } |
| 604 | |
Heiko Carstens | a26eab2 | 2009-01-14 14:14:17 +0100 | [diff] [blame] | 605 | SYSCALL_DEFINE2(fchmod, unsigned int, fd, mode_t, mode) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 606 | { |
| 607 | struct inode * inode; |
| 608 | struct dentry * dentry; |
| 609 | struct file * file; |
| 610 | int err = -EBADF; |
| 611 | struct iattr newattrs; |
| 612 | |
| 613 | file = fget(fd); |
| 614 | if (!file) |
| 615 | goto out; |
| 616 | |
Josef "Jeff" Sipek | 0f7fc9e | 2006-12-08 02:36:35 -0800 | [diff] [blame] | 617 | dentry = file->f_path.dentry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 618 | inode = dentry->d_inode; |
| 619 | |
Al Viro | 5a190ae | 2007-06-07 12:19:32 -0400 | [diff] [blame] | 620 | audit_inode(NULL, dentry); |
Amy Griffis | 73241cc | 2005-11-03 16:00:25 +0000 | [diff] [blame] | 621 | |
npiggin@suse.de | 96029c4 | 2009-04-26 20:25:55 +1000 | [diff] [blame] | 622 | err = mnt_want_write_file(file); |
Dave Hansen | 2af482a | 2008-02-15 14:37:50 -0800 | [diff] [blame] | 623 | if (err) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 624 | goto out_putf; |
Tetsuo Handa | fe542cf | 2009-11-22 11:49:55 +0900 | [diff] [blame] | 625 | mutex_lock(&inode->i_mutex); |
Tetsuo Handa | 89eda06 | 2009-10-04 21:49:47 +0900 | [diff] [blame] | 626 | err = security_path_chmod(dentry, file->f_vfsmnt, mode); |
| 627 | if (err) |
Tetsuo Handa | fe542cf | 2009-11-22 11:49:55 +0900 | [diff] [blame] | 628 | goto out_unlock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 629 | if (mode == (mode_t) -1) |
| 630 | mode = inode->i_mode; |
| 631 | newattrs.ia_mode = (mode & S_IALLUGO) | (inode->i_mode & ~S_IALLUGO); |
| 632 | newattrs.ia_valid = ATTR_MODE | ATTR_CTIME; |
| 633 | err = notify_change(dentry, &newattrs); |
Tetsuo Handa | fe542cf | 2009-11-22 11:49:55 +0900 | [diff] [blame] | 634 | out_unlock: |
Jes Sorensen | 1b1dcc1 | 2006-01-09 15:59:24 -0800 | [diff] [blame] | 635 | mutex_unlock(&inode->i_mutex); |
Dave Hansen | 2af482a | 2008-02-15 14:37:50 -0800 | [diff] [blame] | 636 | mnt_drop_write(file->f_path.mnt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 637 | out_putf: |
| 638 | fput(file); |
| 639 | out: |
| 640 | return err; |
| 641 | } |
| 642 | |
Heiko Carstens | 6559eed8 | 2009-01-14 14:14:32 +0100 | [diff] [blame] | 643 | SYSCALL_DEFINE3(fchmodat, int, dfd, const char __user *, filename, mode_t, mode) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 644 | { |
Al Viro | 2d8f303 | 2008-07-22 09:59:21 -0400 | [diff] [blame] | 645 | struct path path; |
| 646 | struct inode *inode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 647 | int error; |
| 648 | struct iattr newattrs; |
| 649 | |
Al Viro | 2d8f303 | 2008-07-22 09:59:21 -0400 | [diff] [blame] | 650 | error = user_path_at(dfd, filename, LOOKUP_FOLLOW, &path); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 651 | if (error) |
| 652 | goto out; |
Al Viro | 2d8f303 | 2008-07-22 09:59:21 -0400 | [diff] [blame] | 653 | inode = path.dentry->d_inode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 654 | |
Al Viro | 2d8f303 | 2008-07-22 09:59:21 -0400 | [diff] [blame] | 655 | error = mnt_want_write(path.mnt); |
Dave Hansen | 2af482a | 2008-02-15 14:37:50 -0800 | [diff] [blame] | 656 | if (error) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 657 | goto dput_and_out; |
Tetsuo Handa | fe542cf | 2009-11-22 11:49:55 +0900 | [diff] [blame] | 658 | mutex_lock(&inode->i_mutex); |
Tetsuo Handa | 89eda06 | 2009-10-04 21:49:47 +0900 | [diff] [blame] | 659 | error = security_path_chmod(path.dentry, path.mnt, mode); |
| 660 | if (error) |
Tetsuo Handa | fe542cf | 2009-11-22 11:49:55 +0900 | [diff] [blame] | 661 | goto out_unlock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 662 | if (mode == (mode_t) -1) |
| 663 | mode = inode->i_mode; |
| 664 | newattrs.ia_mode = (mode & S_IALLUGO) | (inode->i_mode & ~S_IALLUGO); |
| 665 | newattrs.ia_valid = ATTR_MODE | ATTR_CTIME; |
Al Viro | 2d8f303 | 2008-07-22 09:59:21 -0400 | [diff] [blame] | 666 | error = notify_change(path.dentry, &newattrs); |
Tetsuo Handa | fe542cf | 2009-11-22 11:49:55 +0900 | [diff] [blame] | 667 | out_unlock: |
Jes Sorensen | 1b1dcc1 | 2006-01-09 15:59:24 -0800 | [diff] [blame] | 668 | mutex_unlock(&inode->i_mutex); |
Al Viro | 2d8f303 | 2008-07-22 09:59:21 -0400 | [diff] [blame] | 669 | mnt_drop_write(path.mnt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 670 | dput_and_out: |
Al Viro | 2d8f303 | 2008-07-22 09:59:21 -0400 | [diff] [blame] | 671 | path_put(&path); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 672 | out: |
| 673 | return error; |
| 674 | } |
| 675 | |
Heiko Carstens | a26eab2 | 2009-01-14 14:14:17 +0100 | [diff] [blame] | 676 | SYSCALL_DEFINE2(chmod, const char __user *, filename, mode_t, mode) |
Ulrich Drepper | 5590ff0 | 2006-01-18 17:43:53 -0800 | [diff] [blame] | 677 | { |
| 678 | return sys_fchmodat(AT_FDCWD, filename, mode); |
| 679 | } |
| 680 | |
Tetsuo Handa | fe542cf | 2009-11-22 11:49:55 +0900 | [diff] [blame] | 681 | static int chown_common(struct path *path, uid_t user, gid_t group) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 682 | { |
Tetsuo Handa | fe542cf | 2009-11-22 11:49:55 +0900 | [diff] [blame] | 683 | struct inode *inode = path->dentry->d_inode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 684 | int error; |
| 685 | struct iattr newattrs; |
| 686 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 687 | newattrs.ia_valid = ATTR_CTIME; |
| 688 | if (user != (uid_t) -1) { |
| 689 | newattrs.ia_valid |= ATTR_UID; |
| 690 | newattrs.ia_uid = user; |
| 691 | } |
| 692 | if (group != (gid_t) -1) { |
| 693 | newattrs.ia_valid |= ATTR_GID; |
| 694 | newattrs.ia_gid = group; |
| 695 | } |
| 696 | if (!S_ISDIR(inode->i_mode)) |
Serge E. Hallyn | b537677 | 2007-10-16 23:31:36 -0700 | [diff] [blame] | 697 | newattrs.ia_valid |= |
| 698 | ATTR_KILL_SUID | ATTR_KILL_SGID | ATTR_KILL_PRIV; |
Jes Sorensen | 1b1dcc1 | 2006-01-09 15:59:24 -0800 | [diff] [blame] | 699 | mutex_lock(&inode->i_mutex); |
Tetsuo Handa | fe542cf | 2009-11-22 11:49:55 +0900 | [diff] [blame] | 700 | error = security_path_chown(path, user, group); |
| 701 | if (!error) |
| 702 | error = notify_change(path->dentry, &newattrs); |
Jes Sorensen | 1b1dcc1 | 2006-01-09 15:59:24 -0800 | [diff] [blame] | 703 | mutex_unlock(&inode->i_mutex); |
Miklos Szeredi | beb29e0 | 2008-07-01 15:01:29 +0200 | [diff] [blame] | 704 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 705 | return error; |
| 706 | } |
| 707 | |
Heiko Carstens | ca013e9 | 2009-01-14 14:14:19 +0100 | [diff] [blame] | 708 | SYSCALL_DEFINE3(chown, const char __user *, filename, uid_t, user, gid_t, group) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 709 | { |
Al Viro | 2d8f303 | 2008-07-22 09:59:21 -0400 | [diff] [blame] | 710 | struct path path; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 711 | int error; |
| 712 | |
Al Viro | 2d8f303 | 2008-07-22 09:59:21 -0400 | [diff] [blame] | 713 | error = user_path(filename, &path); |
Dave Hansen | 6902d92 | 2006-09-30 23:29:01 -0700 | [diff] [blame] | 714 | if (error) |
| 715 | goto out; |
Al Viro | 2d8f303 | 2008-07-22 09:59:21 -0400 | [diff] [blame] | 716 | error = mnt_want_write(path.mnt); |
Dave Hansen | 2af482a | 2008-02-15 14:37:50 -0800 | [diff] [blame] | 717 | if (error) |
| 718 | goto out_release; |
Tetsuo Handa | fe542cf | 2009-11-22 11:49:55 +0900 | [diff] [blame] | 719 | error = chown_common(&path, user, group); |
Al Viro | 2d8f303 | 2008-07-22 09:59:21 -0400 | [diff] [blame] | 720 | mnt_drop_write(path.mnt); |
Dave Hansen | 2af482a | 2008-02-15 14:37:50 -0800 | [diff] [blame] | 721 | out_release: |
Al Viro | 2d8f303 | 2008-07-22 09:59:21 -0400 | [diff] [blame] | 722 | path_put(&path); |
Dave Hansen | 6902d92 | 2006-09-30 23:29:01 -0700 | [diff] [blame] | 723 | out: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 724 | return error; |
| 725 | } |
| 726 | |
Heiko Carstens | 6559eed8 | 2009-01-14 14:14:32 +0100 | [diff] [blame] | 727 | SYSCALL_DEFINE5(fchownat, int, dfd, const char __user *, filename, uid_t, user, |
| 728 | gid_t, group, int, flag) |
Ulrich Drepper | 5590ff0 | 2006-01-18 17:43:53 -0800 | [diff] [blame] | 729 | { |
Al Viro | 2d8f303 | 2008-07-22 09:59:21 -0400 | [diff] [blame] | 730 | struct path path; |
Ulrich Drepper | 5590ff0 | 2006-01-18 17:43:53 -0800 | [diff] [blame] | 731 | int error = -EINVAL; |
| 732 | int follow; |
| 733 | |
| 734 | if ((flag & ~AT_SYMLINK_NOFOLLOW) != 0) |
| 735 | goto out; |
| 736 | |
| 737 | follow = (flag & AT_SYMLINK_NOFOLLOW) ? 0 : LOOKUP_FOLLOW; |
Al Viro | 2d8f303 | 2008-07-22 09:59:21 -0400 | [diff] [blame] | 738 | error = user_path_at(dfd, filename, follow, &path); |
Dave Hansen | 6902d92 | 2006-09-30 23:29:01 -0700 | [diff] [blame] | 739 | if (error) |
| 740 | goto out; |
Al Viro | 2d8f303 | 2008-07-22 09:59:21 -0400 | [diff] [blame] | 741 | error = mnt_want_write(path.mnt); |
Dave Hansen | 2af482a | 2008-02-15 14:37:50 -0800 | [diff] [blame] | 742 | if (error) |
| 743 | goto out_release; |
Tetsuo Handa | fe542cf | 2009-11-22 11:49:55 +0900 | [diff] [blame] | 744 | error = chown_common(&path, user, group); |
Al Viro | 2d8f303 | 2008-07-22 09:59:21 -0400 | [diff] [blame] | 745 | mnt_drop_write(path.mnt); |
Dave Hansen | 2af482a | 2008-02-15 14:37:50 -0800 | [diff] [blame] | 746 | out_release: |
Al Viro | 2d8f303 | 2008-07-22 09:59:21 -0400 | [diff] [blame] | 747 | path_put(&path); |
Ulrich Drepper | 5590ff0 | 2006-01-18 17:43:53 -0800 | [diff] [blame] | 748 | out: |
| 749 | return error; |
| 750 | } |
| 751 | |
Heiko Carstens | ca013e9 | 2009-01-14 14:14:19 +0100 | [diff] [blame] | 752 | SYSCALL_DEFINE3(lchown, const char __user *, filename, uid_t, user, gid_t, group) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 753 | { |
Al Viro | 2d8f303 | 2008-07-22 09:59:21 -0400 | [diff] [blame] | 754 | struct path path; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 755 | int error; |
| 756 | |
Al Viro | 2d8f303 | 2008-07-22 09:59:21 -0400 | [diff] [blame] | 757 | error = user_lpath(filename, &path); |
Dave Hansen | 6902d92 | 2006-09-30 23:29:01 -0700 | [diff] [blame] | 758 | if (error) |
| 759 | goto out; |
Al Viro | 2d8f303 | 2008-07-22 09:59:21 -0400 | [diff] [blame] | 760 | error = mnt_want_write(path.mnt); |
Dave Hansen | 2af482a | 2008-02-15 14:37:50 -0800 | [diff] [blame] | 761 | if (error) |
| 762 | goto out_release; |
Tetsuo Handa | fe542cf | 2009-11-22 11:49:55 +0900 | [diff] [blame] | 763 | error = chown_common(&path, user, group); |
Al Viro | 2d8f303 | 2008-07-22 09:59:21 -0400 | [diff] [blame] | 764 | mnt_drop_write(path.mnt); |
Dave Hansen | 2af482a | 2008-02-15 14:37:50 -0800 | [diff] [blame] | 765 | out_release: |
Al Viro | 2d8f303 | 2008-07-22 09:59:21 -0400 | [diff] [blame] | 766 | path_put(&path); |
Dave Hansen | 6902d92 | 2006-09-30 23:29:01 -0700 | [diff] [blame] | 767 | out: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 768 | return error; |
| 769 | } |
| 770 | |
Heiko Carstens | ca013e9 | 2009-01-14 14:14:19 +0100 | [diff] [blame] | 771 | SYSCALL_DEFINE3(fchown, unsigned int, fd, uid_t, user, gid_t, group) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 772 | { |
| 773 | struct file * file; |
| 774 | int error = -EBADF; |
Dave Hansen | 6902d92 | 2006-09-30 23:29:01 -0700 | [diff] [blame] | 775 | struct dentry * dentry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 776 | |
| 777 | file = fget(fd); |
Dave Hansen | 6902d92 | 2006-09-30 23:29:01 -0700 | [diff] [blame] | 778 | if (!file) |
| 779 | goto out; |
| 780 | |
npiggin@suse.de | 96029c4 | 2009-04-26 20:25:55 +1000 | [diff] [blame] | 781 | error = mnt_want_write_file(file); |
Dave Hansen | 2af482a | 2008-02-15 14:37:50 -0800 | [diff] [blame] | 782 | if (error) |
| 783 | goto out_fput; |
Josef "Jeff" Sipek | 0f7fc9e | 2006-12-08 02:36:35 -0800 | [diff] [blame] | 784 | dentry = file->f_path.dentry; |
Al Viro | 5a190ae | 2007-06-07 12:19:32 -0400 | [diff] [blame] | 785 | audit_inode(NULL, dentry); |
Tetsuo Handa | fe542cf | 2009-11-22 11:49:55 +0900 | [diff] [blame] | 786 | error = chown_common(&file->f_path, user, group); |
Dave Hansen | 2af482a | 2008-02-15 14:37:50 -0800 | [diff] [blame] | 787 | mnt_drop_write(file->f_path.mnt); |
| 788 | out_fput: |
Dave Hansen | 6902d92 | 2006-09-30 23:29:01 -0700 | [diff] [blame] | 789 | fput(file); |
| 790 | out: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 791 | return error; |
| 792 | } |
| 793 | |
Dave Hansen | 4a3fd21 | 2008-02-15 14:37:48 -0800 | [diff] [blame] | 794 | /* |
| 795 | * You have to be very careful that these write |
| 796 | * counts get cleaned up in error cases and |
| 797 | * upon __fput(). This should probably never |
| 798 | * be called outside of __dentry_open(). |
| 799 | */ |
| 800 | static inline int __get_file_write_access(struct inode *inode, |
| 801 | struct vfsmount *mnt) |
| 802 | { |
| 803 | int error; |
| 804 | error = get_write_access(inode); |
| 805 | if (error) |
| 806 | return error; |
| 807 | /* |
| 808 | * Do not take mount writer counts on |
| 809 | * special files since no writes to |
| 810 | * the mount itself will occur. |
| 811 | */ |
| 812 | if (!special_file(inode->i_mode)) { |
| 813 | /* |
| 814 | * Balanced in __fput() |
| 815 | */ |
| 816 | error = mnt_want_write(mnt); |
| 817 | if (error) |
| 818 | put_write_access(inode); |
| 819 | } |
| 820 | return error; |
| 821 | } |
| 822 | |
Peter Staubach | a1a5b3d | 2005-09-13 01:25:12 -0700 | [diff] [blame] | 823 | static struct file *__dentry_open(struct dentry *dentry, struct vfsmount *mnt, |
Trond Myklebust | 834f2a4 | 2005-10-18 14:20:16 -0700 | [diff] [blame] | 824 | int flags, struct file *f, |
David Howells | 745ca24 | 2008-11-14 10:39:22 +1100 | [diff] [blame] | 825 | int (*open)(struct inode *, struct file *), |
| 826 | const struct cred *cred) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 827 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 828 | struct inode *inode; |
| 829 | int error; |
| 830 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 831 | f->f_flags = flags; |
Al Viro | aeb5d72 | 2008-09-02 15:28:45 -0400 | [diff] [blame] | 832 | f->f_mode = (__force fmode_t)((flags+1) & O_ACCMODE) | FMODE_LSEEK | |
Peter Staubach | a1a5b3d | 2005-09-13 01:25:12 -0700 | [diff] [blame] | 833 | FMODE_PREAD | FMODE_PWRITE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 834 | inode = dentry->d_inode; |
| 835 | if (f->f_mode & FMODE_WRITE) { |
Dave Hansen | 4a3fd21 | 2008-02-15 14:37:48 -0800 | [diff] [blame] | 836 | error = __get_file_write_access(inode, mnt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 837 | if (error) |
| 838 | goto cleanup_file; |
Dave Hansen | ad775f5 | 2008-02-15 14:38:01 -0800 | [diff] [blame] | 839 | if (!special_file(inode->i_mode)) |
| 840 | file_take_write(f); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 841 | } |
| 842 | |
| 843 | f->f_mapping = inode->i_mapping; |
Josef "Jeff" Sipek | 0f7fc9e | 2006-12-08 02:36:35 -0800 | [diff] [blame] | 844 | f->f_path.dentry = dentry; |
| 845 | f->f_path.mnt = mnt; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 846 | f->f_pos = 0; |
| 847 | f->f_op = fops_get(inode->i_fop); |
| 848 | file_move(f, &inode->i_sb->s_files); |
| 849 | |
David Howells | 745ca24 | 2008-11-14 10:39:22 +1100 | [diff] [blame] | 850 | error = security_dentry_open(f, cred); |
Yuichi Nakamura | 788e7dd | 2007-09-14 09:27:07 +0900 | [diff] [blame] | 851 | if (error) |
| 852 | goto cleanup_all; |
| 853 | |
Trond Myklebust | 834f2a4 | 2005-10-18 14:20:16 -0700 | [diff] [blame] | 854 | if (!open && f->f_op) |
| 855 | open = f->f_op->open; |
| 856 | if (open) { |
| 857 | error = open(inode, f); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 858 | if (error) |
| 859 | goto cleanup_all; |
| 860 | } |
Al Viro | b65a9cf | 2009-12-16 06:27:40 -0500 | [diff] [blame^] | 861 | ima_counts_get(f); |
Trond Myklebust | 834f2a4 | 2005-10-18 14:20:16 -0700 | [diff] [blame] | 862 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 863 | f->f_flags &= ~(O_CREAT | O_EXCL | O_NOCTTY | O_TRUNC); |
| 864 | |
| 865 | file_ra_state_init(&f->f_ra, f->f_mapping->host->i_mapping); |
| 866 | |
| 867 | /* NB: we're sure to have correct a_ops only after f_op->open */ |
| 868 | if (f->f_flags & O_DIRECT) { |
Carsten Otte | ceffc07 | 2005-06-23 22:05:25 -0700 | [diff] [blame] | 869 | if (!f->f_mapping->a_ops || |
| 870 | ((!f->f_mapping->a_ops->direct_IO) && |
Nick Piggin | 70688e4 | 2008-04-28 02:13:02 -0700 | [diff] [blame] | 871 | (!f->f_mapping->a_ops->get_xip_mem))) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 872 | fput(f); |
| 873 | f = ERR_PTR(-EINVAL); |
| 874 | } |
| 875 | } |
| 876 | |
| 877 | return f; |
| 878 | |
| 879 | cleanup_all: |
| 880 | fops_put(f->f_op); |
Dave Hansen | 4a3fd21 | 2008-02-15 14:37:48 -0800 | [diff] [blame] | 881 | if (f->f_mode & FMODE_WRITE) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 882 | put_write_access(inode); |
Dave Hansen | ad775f5 | 2008-02-15 14:38:01 -0800 | [diff] [blame] | 883 | if (!special_file(inode->i_mode)) { |
| 884 | /* |
| 885 | * We don't consider this a real |
| 886 | * mnt_want/drop_write() pair |
| 887 | * because it all happenend right |
| 888 | * here, so just reset the state. |
| 889 | */ |
| 890 | file_reset_write(f); |
Dave Hansen | 4a3fd21 | 2008-02-15 14:37:48 -0800 | [diff] [blame] | 891 | mnt_drop_write(mnt); |
Dave Hansen | ad775f5 | 2008-02-15 14:38:01 -0800 | [diff] [blame] | 892 | } |
Dave Hansen | 4a3fd21 | 2008-02-15 14:37:48 -0800 | [diff] [blame] | 893 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 894 | file_kill(f); |
Josef "Jeff" Sipek | 0f7fc9e | 2006-12-08 02:36:35 -0800 | [diff] [blame] | 895 | f->f_path.dentry = NULL; |
| 896 | f->f_path.mnt = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 897 | cleanup_file: |
| 898 | put_filp(f); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 899 | dput(dentry); |
| 900 | mntput(mnt); |
| 901 | return ERR_PTR(error); |
| 902 | } |
| 903 | |
Trond Myklebust | 834f2a4 | 2005-10-18 14:20:16 -0700 | [diff] [blame] | 904 | /** |
| 905 | * lookup_instantiate_filp - instantiates the open intent filp |
| 906 | * @nd: pointer to nameidata |
| 907 | * @dentry: pointer to dentry |
| 908 | * @open: open callback |
| 909 | * |
| 910 | * Helper for filesystems that want to use lookup open intents and pass back |
| 911 | * a fully instantiated struct file to the caller. |
| 912 | * This function is meant to be called from within a filesystem's |
| 913 | * lookup method. |
Oleg Drokin | 9a56c21 | 2006-03-25 03:07:02 -0800 | [diff] [blame] | 914 | * Beware of calling it for non-regular files! Those ->open methods might block |
| 915 | * (e.g. in fifo_open), leaving you with parent locked (and in case of fifo, |
| 916 | * leading to a deadlock, as nobody can open that fifo anymore, because |
| 917 | * another process to open fifo will block on locked parent when doing lookup). |
Trond Myklebust | 834f2a4 | 2005-10-18 14:20:16 -0700 | [diff] [blame] | 918 | * Note that in case of error, nd->intent.open.file is destroyed, but the |
| 919 | * path information remains valid. |
| 920 | * If the open callback is set to NULL, then the standard f_op->open() |
| 921 | * filesystem callback is substituted. |
| 922 | */ |
| 923 | struct file *lookup_instantiate_filp(struct nameidata *nd, struct dentry *dentry, |
| 924 | int (*open)(struct inode *, struct file *)) |
| 925 | { |
David Howells | 745ca24 | 2008-11-14 10:39:22 +1100 | [diff] [blame] | 926 | const struct cred *cred = current_cred(); |
| 927 | |
Trond Myklebust | 834f2a4 | 2005-10-18 14:20:16 -0700 | [diff] [blame] | 928 | if (IS_ERR(nd->intent.open.file)) |
| 929 | goto out; |
| 930 | if (IS_ERR(dentry)) |
| 931 | goto out_err; |
Jan Blunck | 4ac9137 | 2008-02-14 19:34:32 -0800 | [diff] [blame] | 932 | nd->intent.open.file = __dentry_open(dget(dentry), mntget(nd->path.mnt), |
Trond Myklebust | 834f2a4 | 2005-10-18 14:20:16 -0700 | [diff] [blame] | 933 | nd->intent.open.flags - 1, |
| 934 | nd->intent.open.file, |
David Howells | 745ca24 | 2008-11-14 10:39:22 +1100 | [diff] [blame] | 935 | open, cred); |
Trond Myklebust | 834f2a4 | 2005-10-18 14:20:16 -0700 | [diff] [blame] | 936 | out: |
| 937 | return nd->intent.open.file; |
| 938 | out_err: |
| 939 | release_open_intent(nd); |
| 940 | nd->intent.open.file = (struct file *)dentry; |
| 941 | goto out; |
| 942 | } |
| 943 | EXPORT_SYMBOL_GPL(lookup_instantiate_filp); |
| 944 | |
| 945 | /** |
| 946 | * nameidata_to_filp - convert a nameidata to an open filp. |
| 947 | * @nd: pointer to nameidata |
| 948 | * @flags: open flags |
| 949 | * |
| 950 | * Note that this function destroys the original nameidata |
| 951 | */ |
| 952 | struct file *nameidata_to_filp(struct nameidata *nd, int flags) |
| 953 | { |
David Howells | 745ca24 | 2008-11-14 10:39:22 +1100 | [diff] [blame] | 954 | const struct cred *cred = current_cred(); |
Trond Myklebust | 834f2a4 | 2005-10-18 14:20:16 -0700 | [diff] [blame] | 955 | struct file *filp; |
| 956 | |
| 957 | /* Pick up the filp from the open intent */ |
| 958 | filp = nd->intent.open.file; |
| 959 | /* Has the filesystem initialised the file for us? */ |
Josef "Jeff" Sipek | 0f7fc9e | 2006-12-08 02:36:35 -0800 | [diff] [blame] | 960 | if (filp->f_path.dentry == NULL) |
Jan Blunck | 4ac9137 | 2008-02-14 19:34:32 -0800 | [diff] [blame] | 961 | filp = __dentry_open(nd->path.dentry, nd->path.mnt, flags, filp, |
David Howells | 745ca24 | 2008-11-14 10:39:22 +1100 | [diff] [blame] | 962 | NULL, cred); |
Trond Myklebust | 834f2a4 | 2005-10-18 14:20:16 -0700 | [diff] [blame] | 963 | else |
Jan Blunck | 1d957f9 | 2008-02-14 19:34:35 -0800 | [diff] [blame] | 964 | path_put(&nd->path); |
Trond Myklebust | 834f2a4 | 2005-10-18 14:20:16 -0700 | [diff] [blame] | 965 | return filp; |
| 966 | } |
| 967 | |
Peter Staubach | 6fdcc21 | 2005-11-07 00:59:42 -0800 | [diff] [blame] | 968 | /* |
| 969 | * dentry_open() will have done dput(dentry) and mntput(mnt) if it returns an |
| 970 | * error. |
| 971 | */ |
David Howells | 745ca24 | 2008-11-14 10:39:22 +1100 | [diff] [blame] | 972 | struct file *dentry_open(struct dentry *dentry, struct vfsmount *mnt, int flags, |
| 973 | const struct cred *cred) |
Peter Staubach | a1a5b3d | 2005-09-13 01:25:12 -0700 | [diff] [blame] | 974 | { |
| 975 | int error; |
| 976 | struct file *f; |
| 977 | |
David Howells | e0e8173 | 2009-09-02 09:13:40 +0100 | [diff] [blame] | 978 | validate_creds(cred); |
| 979 | |
Christoph Hellwig | 322ee5b | 2008-02-15 14:37:24 -0800 | [diff] [blame] | 980 | /* |
| 981 | * We must always pass in a valid mount pointer. Historically |
| 982 | * callers got away with not passing it, but we must enforce this at |
| 983 | * the earliest possible point now to avoid strange problems deep in the |
| 984 | * filesystem stack. |
| 985 | */ |
| 986 | if (!mnt) { |
| 987 | printk(KERN_WARNING "%s called with NULL vfsmount\n", __func__); |
| 988 | dump_stack(); |
| 989 | return ERR_PTR(-EINVAL); |
| 990 | } |
| 991 | |
Peter Staubach | a1a5b3d | 2005-09-13 01:25:12 -0700 | [diff] [blame] | 992 | error = -ENFILE; |
| 993 | f = get_empty_filp(); |
Peter Staubach | 6fdcc21 | 2005-11-07 00:59:42 -0800 | [diff] [blame] | 994 | if (f == NULL) { |
| 995 | dput(dentry); |
| 996 | mntput(mnt); |
Peter Staubach | a1a5b3d | 2005-09-13 01:25:12 -0700 | [diff] [blame] | 997 | return ERR_PTR(error); |
Peter Staubach | 6fdcc21 | 2005-11-07 00:59:42 -0800 | [diff] [blame] | 998 | } |
Peter Staubach | a1a5b3d | 2005-09-13 01:25:12 -0700 | [diff] [blame] | 999 | |
David Howells | 745ca24 | 2008-11-14 10:39:22 +1100 | [diff] [blame] | 1000 | return __dentry_open(dentry, mnt, flags, f, NULL, cred); |
Peter Staubach | a1a5b3d | 2005-09-13 01:25:12 -0700 | [diff] [blame] | 1001 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1002 | EXPORT_SYMBOL(dentry_open); |
| 1003 | |
Matt Mackall | b01ec0e | 2006-01-08 01:05:20 -0800 | [diff] [blame] | 1004 | static void __put_unused_fd(struct files_struct *files, unsigned int fd) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1005 | { |
Dipankar Sarma | badf166 | 2005-09-09 13:04:10 -0700 | [diff] [blame] | 1006 | struct fdtable *fdt = files_fdtable(files); |
| 1007 | __FD_CLR(fd, fdt->open_fds); |
Eric Dumazet | 0c9e63f | 2006-03-23 03:00:12 -0800 | [diff] [blame] | 1008 | if (fd < files->next_fd) |
| 1009 | files->next_fd = fd; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1010 | } |
| 1011 | |
Harvey Harrison | fc9b52c | 2008-02-08 04:19:52 -0800 | [diff] [blame] | 1012 | void put_unused_fd(unsigned int fd) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1013 | { |
| 1014 | struct files_struct *files = current->files; |
| 1015 | spin_lock(&files->file_lock); |
| 1016 | __put_unused_fd(files, fd); |
| 1017 | spin_unlock(&files->file_lock); |
| 1018 | } |
| 1019 | |
| 1020 | EXPORT_SYMBOL(put_unused_fd); |
| 1021 | |
| 1022 | /* |
Ulrich Drepper | 5590ff0 | 2006-01-18 17:43:53 -0800 | [diff] [blame] | 1023 | * Install a file pointer in the fd array. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1024 | * |
| 1025 | * The VFS is full of places where we drop the files lock between |
| 1026 | * setting the open_fds bitmap and installing the file in the file |
| 1027 | * array. At any such point, we are vulnerable to a dup2() race |
| 1028 | * installing a file in the array before us. We need to detect this and |
| 1029 | * fput() the struct file we are about to overwrite in this case. |
| 1030 | * |
| 1031 | * It should never happen - if we allow dup2() do it, _really_ bad things |
| 1032 | * will follow. |
| 1033 | */ |
| 1034 | |
Harvey Harrison | fc9b52c | 2008-02-08 04:19:52 -0800 | [diff] [blame] | 1035 | void fd_install(unsigned int fd, struct file *file) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1036 | { |
| 1037 | struct files_struct *files = current->files; |
Dipankar Sarma | badf166 | 2005-09-09 13:04:10 -0700 | [diff] [blame] | 1038 | struct fdtable *fdt; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1039 | spin_lock(&files->file_lock); |
Dipankar Sarma | badf166 | 2005-09-09 13:04:10 -0700 | [diff] [blame] | 1040 | fdt = files_fdtable(files); |
Dipankar Sarma | ab2af1f | 2005-09-09 13:04:13 -0700 | [diff] [blame] | 1041 | BUG_ON(fdt->fd[fd] != NULL); |
| 1042 | rcu_assign_pointer(fdt->fd[fd], file); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1043 | spin_unlock(&files->file_lock); |
| 1044 | } |
| 1045 | |
| 1046 | EXPORT_SYMBOL(fd_install); |
| 1047 | |
Ulrich Drepper | 5590ff0 | 2006-01-18 17:43:53 -0800 | [diff] [blame] | 1048 | long do_sys_open(int dfd, const char __user *filename, int flags, int mode) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1049 | { |
Miklos Szeredi | e922efc | 2005-09-06 15:18:25 -0700 | [diff] [blame] | 1050 | char *tmp = getname(filename); |
| 1051 | int fd = PTR_ERR(tmp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1052 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1053 | if (!IS_ERR(tmp)) { |
Ulrich Drepper | f23513e | 2007-07-15 23:40:32 -0700 | [diff] [blame] | 1054 | fd = get_unused_fd_flags(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1055 | if (fd >= 0) { |
Al Viro | 6e8341a | 2009-04-06 11:16:22 -0400 | [diff] [blame] | 1056 | struct file *f = do_filp_open(dfd, tmp, flags, mode, 0); |
Telemaque Ndizihiwe | fed2fc1 | 2005-06-23 00:10:33 -0700 | [diff] [blame] | 1057 | if (IS_ERR(f)) { |
| 1058 | put_unused_fd(fd); |
| 1059 | fd = PTR_ERR(f); |
| 1060 | } else { |
Josef "Jeff" Sipek | 0f7fc9e | 2006-12-08 02:36:35 -0800 | [diff] [blame] | 1061 | fsnotify_open(f->f_path.dentry); |
Telemaque Ndizihiwe | fed2fc1 | 2005-06-23 00:10:33 -0700 | [diff] [blame] | 1062 | fd_install(fd, f); |
| 1063 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1064 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1065 | putname(tmp); |
| 1066 | } |
| 1067 | return fd; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1068 | } |
Miklos Szeredi | e922efc | 2005-09-06 15:18:25 -0700 | [diff] [blame] | 1069 | |
Heiko Carstens | ca013e9 | 2009-01-14 14:14:19 +0100 | [diff] [blame] | 1070 | SYSCALL_DEFINE3(open, const char __user *, filename, int, flags, int, mode) |
Miklos Szeredi | e922efc | 2005-09-06 15:18:25 -0700 | [diff] [blame] | 1071 | { |
Linus Torvalds | 385910f | 2006-04-18 13:22:59 -0700 | [diff] [blame] | 1072 | long ret; |
| 1073 | |
Miklos Szeredi | e922efc | 2005-09-06 15:18:25 -0700 | [diff] [blame] | 1074 | if (force_o_largefile()) |
| 1075 | flags |= O_LARGEFILE; |
| 1076 | |
Linus Torvalds | 385910f | 2006-04-18 13:22:59 -0700 | [diff] [blame] | 1077 | ret = do_sys_open(AT_FDCWD, filename, flags, mode); |
| 1078 | /* avoid REGPARM breakage on x86: */ |
Roland McGrath | 54a0151 | 2008-04-10 15:37:38 -0700 | [diff] [blame] | 1079 | asmlinkage_protect(3, ret, filename, flags, mode); |
Linus Torvalds | 385910f | 2006-04-18 13:22:59 -0700 | [diff] [blame] | 1080 | return ret; |
Miklos Szeredi | e922efc | 2005-09-06 15:18:25 -0700 | [diff] [blame] | 1081 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1082 | |
Heiko Carstens | 6559eed8 | 2009-01-14 14:14:32 +0100 | [diff] [blame] | 1083 | SYSCALL_DEFINE4(openat, int, dfd, const char __user *, filename, int, flags, |
| 1084 | int, mode) |
Ulrich Drepper | 5590ff0 | 2006-01-18 17:43:53 -0800 | [diff] [blame] | 1085 | { |
Linus Torvalds | 385910f | 2006-04-18 13:22:59 -0700 | [diff] [blame] | 1086 | long ret; |
| 1087 | |
Ulrich Drepper | 5590ff0 | 2006-01-18 17:43:53 -0800 | [diff] [blame] | 1088 | if (force_o_largefile()) |
| 1089 | flags |= O_LARGEFILE; |
| 1090 | |
Linus Torvalds | 385910f | 2006-04-18 13:22:59 -0700 | [diff] [blame] | 1091 | ret = do_sys_open(dfd, filename, flags, mode); |
| 1092 | /* avoid REGPARM breakage on x86: */ |
Roland McGrath | 54a0151 | 2008-04-10 15:37:38 -0700 | [diff] [blame] | 1093 | asmlinkage_protect(4, ret, dfd, filename, flags, mode); |
Linus Torvalds | 385910f | 2006-04-18 13:22:59 -0700 | [diff] [blame] | 1094 | return ret; |
Ulrich Drepper | 5590ff0 | 2006-01-18 17:43:53 -0800 | [diff] [blame] | 1095 | } |
Ulrich Drepper | 5590ff0 | 2006-01-18 17:43:53 -0800 | [diff] [blame] | 1096 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1097 | #ifndef __alpha__ |
| 1098 | |
| 1099 | /* |
| 1100 | * For backward compatibility? Maybe this should be moved |
| 1101 | * into arch/i386 instead? |
| 1102 | */ |
Heiko Carstens | 002c897 | 2009-01-14 14:14:18 +0100 | [diff] [blame] | 1103 | SYSCALL_DEFINE2(creat, const char __user *, pathname, int, mode) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1104 | { |
| 1105 | return sys_open(pathname, O_CREAT | O_WRONLY | O_TRUNC, mode); |
| 1106 | } |
| 1107 | |
| 1108 | #endif |
| 1109 | |
| 1110 | /* |
| 1111 | * "id" is the POSIX thread ID. We use the |
| 1112 | * files pointer for this.. |
| 1113 | */ |
| 1114 | int filp_close(struct file *filp, fl_owner_t id) |
| 1115 | { |
Christoph Lameter | 45778ca | 2005-06-23 00:10:17 -0700 | [diff] [blame] | 1116 | int retval = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1117 | |
| 1118 | if (!file_count(filp)) { |
| 1119 | printk(KERN_ERR "VFS: Close: file count is 0\n"); |
Christoph Lameter | 45778ca | 2005-06-23 00:10:17 -0700 | [diff] [blame] | 1120 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1121 | } |
| 1122 | |
Christoph Lameter | 45778ca | 2005-06-23 00:10:17 -0700 | [diff] [blame] | 1123 | if (filp->f_op && filp->f_op->flush) |
Miklos Szeredi | 75e1fcc | 2006-06-23 02:05:12 -0700 | [diff] [blame] | 1124 | retval = filp->f_op->flush(filp, id); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1125 | |
| 1126 | dnotify_flush(filp, id); |
| 1127 | locks_remove_posix(filp, id); |
| 1128 | fput(filp); |
| 1129 | return retval; |
| 1130 | } |
| 1131 | |
| 1132 | EXPORT_SYMBOL(filp_close); |
| 1133 | |
| 1134 | /* |
| 1135 | * Careful here! We test whether the file pointer is NULL before |
| 1136 | * releasing the fd. This ensures that one clone task can't release |
| 1137 | * an fd while another clone is opening it. |
| 1138 | */ |
Heiko Carstens | ca013e9 | 2009-01-14 14:14:19 +0100 | [diff] [blame] | 1139 | SYSCALL_DEFINE1(close, unsigned int, fd) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1140 | { |
| 1141 | struct file * filp; |
| 1142 | struct files_struct *files = current->files; |
Dipankar Sarma | badf166 | 2005-09-09 13:04:10 -0700 | [diff] [blame] | 1143 | struct fdtable *fdt; |
Ernie Petrides | ee731f4 | 2006-09-29 02:00:13 -0700 | [diff] [blame] | 1144 | int retval; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1145 | |
| 1146 | spin_lock(&files->file_lock); |
Dipankar Sarma | badf166 | 2005-09-09 13:04:10 -0700 | [diff] [blame] | 1147 | fdt = files_fdtable(files); |
| 1148 | if (fd >= fdt->max_fds) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1149 | goto out_unlock; |
Dipankar Sarma | badf166 | 2005-09-09 13:04:10 -0700 | [diff] [blame] | 1150 | filp = fdt->fd[fd]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1151 | if (!filp) |
| 1152 | goto out_unlock; |
Dipankar Sarma | ab2af1f | 2005-09-09 13:04:13 -0700 | [diff] [blame] | 1153 | rcu_assign_pointer(fdt->fd[fd], NULL); |
Dipankar Sarma | badf166 | 2005-09-09 13:04:10 -0700 | [diff] [blame] | 1154 | FD_CLR(fd, fdt->close_on_exec); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1155 | __put_unused_fd(files, fd); |
| 1156 | spin_unlock(&files->file_lock); |
Ernie Petrides | ee731f4 | 2006-09-29 02:00:13 -0700 | [diff] [blame] | 1157 | retval = filp_close(filp, files); |
| 1158 | |
| 1159 | /* can't restart close syscall because file table entry was cleared */ |
| 1160 | if (unlikely(retval == -ERESTARTSYS || |
| 1161 | retval == -ERESTARTNOINTR || |
| 1162 | retval == -ERESTARTNOHAND || |
| 1163 | retval == -ERESTART_RESTARTBLOCK)) |
| 1164 | retval = -EINTR; |
| 1165 | |
| 1166 | return retval; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1167 | |
| 1168 | out_unlock: |
| 1169 | spin_unlock(&files->file_lock); |
| 1170 | return -EBADF; |
| 1171 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1172 | EXPORT_SYMBOL(sys_close); |
| 1173 | |
| 1174 | /* |
| 1175 | * This routine simulates a hangup on the tty, to arrange that users |
| 1176 | * are given clean terminals at login time. |
| 1177 | */ |
Heiko Carstens | ca013e9 | 2009-01-14 14:14:19 +0100 | [diff] [blame] | 1178 | SYSCALL_DEFINE0(vhangup) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1179 | { |
| 1180 | if (capable(CAP_SYS_TTY_CONFIG)) { |
Alan Cox | 2cb5998 | 2008-10-13 10:40:30 +0100 | [diff] [blame] | 1181 | tty_vhangup_self(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1182 | return 0; |
| 1183 | } |
| 1184 | return -EPERM; |
| 1185 | } |
| 1186 | |
| 1187 | /* |
| 1188 | * Called when an inode is about to be open. |
| 1189 | * We use this to disallow opening large files on 32bit systems if |
| 1190 | * the caller didn't specify O_LARGEFILE. On 64bit systems we force |
| 1191 | * on this flag in sys_open. |
| 1192 | */ |
| 1193 | int generic_file_open(struct inode * inode, struct file * filp) |
| 1194 | { |
| 1195 | if (!(filp->f_flags & O_LARGEFILE) && i_size_read(inode) > MAX_NON_LFS) |
Alan Cox | a9c62a1 | 2007-10-16 23:30:22 -0700 | [diff] [blame] | 1196 | return -EOVERFLOW; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1197 | return 0; |
| 1198 | } |
| 1199 | |
| 1200 | EXPORT_SYMBOL(generic_file_open); |
| 1201 | |
| 1202 | /* |
| 1203 | * This is used by subsystems that don't want seekable |
| 1204 | * file descriptors |
| 1205 | */ |
| 1206 | int nonseekable_open(struct inode *inode, struct file *filp) |
| 1207 | { |
| 1208 | filp->f_mode &= ~(FMODE_LSEEK | FMODE_PREAD | FMODE_PWRITE); |
| 1209 | return 0; |
| 1210 | } |
| 1211 | |
| 1212 | EXPORT_SYMBOL(nonseekable_open); |