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> |
Robert Love | 0eeca28 | 2005-07-12 17:06:03 -0400 | [diff] [blame] | 11 | #include <linux/fsnotify.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 12 | #include <linux/module.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 13 | #include <linux/tty.h> |
| 14 | #include <linux/namei.h> |
| 15 | #include <linux/backing-dev.h> |
Randy Dunlap | 16f7e0f | 2006-01-11 12:17:46 -0800 | [diff] [blame] | 16 | #include <linux/capability.h> |
Andrew G. Morgan | 086f731 | 2008-07-04 09:59:58 -0700 | [diff] [blame] | 17 | #include <linux/securebits.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 18 | #include <linux/security.h> |
| 19 | #include <linux/mount.h> |
Ulrich Drepper | 5590ff0 | 2006-01-18 17:43:53 -0800 | [diff] [blame] | 20 | #include <linux/fcntl.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 21 | #include <linux/slab.h> |
Linus Torvalds | 7c0f6ba | 2016-12-24 11:46:01 -0800 | [diff] [blame] | 22 | #include <linux/uaccess.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 23 | #include <linux/fs.h> |
Yoav Zach | ef3daed | 2005-06-23 00:09:58 -0700 | [diff] [blame] | 24 | #include <linux/personality.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 25 | #include <linux/pagemap.h> |
| 26 | #include <linux/syscalls.h> |
Dipankar Sarma | ab2af1f | 2005-09-09 13:04:13 -0700 | [diff] [blame] | 27 | #include <linux/rcupdate.h> |
Amy Griffis | 73241cc | 2005-11-03 16:00:25 +0000 | [diff] [blame] | 28 | #include <linux/audit.h> |
Amit Arora | 97ac735 | 2007-07-17 21:42:44 -0400 | [diff] [blame] | 29 | #include <linux/falloc.h> |
Al Viro | 5ad4e53 | 2009-03-29 19:50:06 -0400 | [diff] [blame] | 30 | #include <linux/fs_struct.h> |
Al Viro | b65a9cf | 2009-12-16 06:27:40 -0500 | [diff] [blame] | 31 | #include <linux/ima.h> |
Eric Paris | 2dfc1ca | 2009-12-17 20:30:52 -0500 | [diff] [blame] | 32 | #include <linux/dnotify.h> |
Al Viro | 3f6d078 | 2013-02-24 13:49:08 -0500 | [diff] [blame] | 33 | #include <linux/compat.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 | |
NeilBrown | 4a30131 | 2006-01-08 01:02:39 -0800 | [diff] [blame] | 37 | int do_truncate(struct dentry *dentry, loff_t length, unsigned int time_attrs, |
| 38 | struct file *filp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 39 | { |
Amerigo Wang | 939a942 | 2009-08-20 19:29:03 -0700 | [diff] [blame] | 40 | int ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 41 | struct iattr newattrs; |
| 42 | |
| 43 | /* Not pretty: "inode->i_size" shouldn't really be signed. But it is. */ |
| 44 | if (length < 0) |
| 45 | return -EINVAL; |
| 46 | |
| 47 | newattrs.ia_size = length; |
NeilBrown | 4a30131 | 2006-01-08 01:02:39 -0800 | [diff] [blame] | 48 | newattrs.ia_valid = ATTR_SIZE | time_attrs; |
Miklos Szeredi | cc4e69d | 2005-11-07 00:59:49 -0800 | [diff] [blame] | 49 | if (filp) { |
| 50 | newattrs.ia_file = filp; |
| 51 | newattrs.ia_valid |= ATTR_FILE; |
| 52 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 53 | |
Jan Kara | 45f147a | 2015-05-21 16:05:55 +0200 | [diff] [blame] | 54 | /* Remove suid, sgid, and file capabilities on truncate too */ |
| 55 | ret = dentry_needs_remove_privs(dentry); |
| 56 | if (ret < 0) |
| 57 | return ret; |
Amerigo Wang | 939a942 | 2009-08-20 19:29:03 -0700 | [diff] [blame] | 58 | if (ret) |
| 59 | newattrs.ia_valid |= ret | ATTR_FORCE; |
Linus Torvalds | 7b82dc0 | 2007-05-08 20:10:00 -0700 | [diff] [blame] | 60 | |
Al Viro | 5955102 | 2016-01-22 15:40:57 -0500 | [diff] [blame] | 61 | inode_lock(dentry->d_inode); |
J. Bruce Fields | 27ac0ff | 2011-09-20 17:19:26 -0400 | [diff] [blame] | 62 | /* Note any delegations or leases have already been broken: */ |
| 63 | ret = notify_change(dentry, &newattrs, NULL); |
Al Viro | 5955102 | 2016-01-22 15:40:57 -0500 | [diff] [blame] | 64 | inode_unlock(dentry->d_inode); |
Amerigo Wang | 939a942 | 2009-08-20 19:29:03 -0700 | [diff] [blame] | 65 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 66 | } |
| 67 | |
Al Viro | 7df818b | 2016-03-25 14:24:09 -0400 | [diff] [blame] | 68 | long vfs_truncate(const struct path *path, loff_t length) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 69 | { |
Al Viro | 2d8f303 | 2008-07-22 09:59:21 -0400 | [diff] [blame] | 70 | struct inode *inode; |
Miklos Szeredi | 4d0c5ba | 2016-09-16 12:44:21 +0200 | [diff] [blame] | 71 | struct dentry *upperdentry; |
David Howells | a02de96 | 2012-12-20 21:52:36 +0000 | [diff] [blame] | 72 | long error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 73 | |
David Howells | a02de96 | 2012-12-20 21:52:36 +0000 | [diff] [blame] | 74 | inode = path->dentry->d_inode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 75 | |
| 76 | /* For directories it's -EISDIR, for other non-regulars - -EINVAL */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 77 | if (S_ISDIR(inode->i_mode)) |
David Howells | a02de96 | 2012-12-20 21:52:36 +0000 | [diff] [blame] | 78 | return -EISDIR; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 79 | if (!S_ISREG(inode->i_mode)) |
David Howells | a02de96 | 2012-12-20 21:52:36 +0000 | [diff] [blame] | 80 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 81 | |
David Howells | a02de96 | 2012-12-20 21:52:36 +0000 | [diff] [blame] | 82 | error = mnt_want_write(path->mnt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 83 | if (error) |
David Howells | a02de96 | 2012-12-20 21:52:36 +0000 | [diff] [blame] | 84 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 85 | |
Al Viro | 256984a | 2008-07-22 08:09:30 -0400 | [diff] [blame] | 86 | error = inode_permission(inode, MAY_WRITE); |
Dave Hansen | 9ac9b84 | 2008-02-15 14:37:52 -0800 | [diff] [blame] | 87 | if (error) |
| 88 | goto mnt_drop_write_and_out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 89 | |
| 90 | error = -EPERM; |
Miklos Szeredi | c82e42d | 2008-06-24 16:50:12 +0200 | [diff] [blame] | 91 | if (IS_APPEND(inode)) |
Dave Hansen | 9ac9b84 | 2008-02-15 14:37:52 -0800 | [diff] [blame] | 92 | goto mnt_drop_write_and_out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 93 | |
Miklos Szeredi | 4d0c5ba | 2016-09-16 12:44:21 +0200 | [diff] [blame] | 94 | /* |
| 95 | * If this is an overlayfs then do as if opening the file so we get |
| 96 | * write access on the upper inode, not on the overlay inode. For |
| 97 | * non-overlay filesystems d_real() is an identity function. |
| 98 | */ |
| 99 | upperdentry = d_real(path->dentry, NULL, O_WRONLY); |
| 100 | error = PTR_ERR(upperdentry); |
| 101 | if (IS_ERR(upperdentry)) |
| 102 | goto mnt_drop_write_and_out; |
| 103 | |
| 104 | error = get_write_access(upperdentry->d_inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 105 | if (error) |
Dave Hansen | 9ac9b84 | 2008-02-15 14:37:52 -0800 | [diff] [blame] | 106 | goto mnt_drop_write_and_out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 107 | |
david m. richter | 9700382 | 2007-07-31 00:39:12 -0700 | [diff] [blame] | 108 | /* |
| 109 | * Make sure that there are no leases. get_write_access() protects |
| 110 | * against the truncate racing with a lease-granting setlease(). |
| 111 | */ |
Al Viro | 8737c93 | 2009-12-24 06:47:55 -0500 | [diff] [blame] | 112 | error = break_lease(inode, O_WRONLY); |
david m. richter | 9700382 | 2007-07-31 00:39:12 -0700 | [diff] [blame] | 113 | if (error) |
| 114 | goto put_write_and_out; |
| 115 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 116 | error = locks_verify_truncate(inode, NULL, length); |
Kentaro Takeda | be6d3e5 | 2008-12-17 13:24:15 +0900 | [diff] [blame] | 117 | if (!error) |
David Howells | a02de96 | 2012-12-20 21:52:36 +0000 | [diff] [blame] | 118 | error = security_path_truncate(path); |
Christoph Hellwig | 907f455 | 2010-03-03 09:05:06 -0500 | [diff] [blame] | 119 | if (!error) |
David Howells | a02de96 | 2012-12-20 21:52:36 +0000 | [diff] [blame] | 120 | error = do_truncate(path->dentry, length, 0, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 121 | |
david m. richter | 9700382 | 2007-07-31 00:39:12 -0700 | [diff] [blame] | 122 | put_write_and_out: |
Miklos Szeredi | 4d0c5ba | 2016-09-16 12:44:21 +0200 | [diff] [blame] | 123 | put_write_access(upperdentry->d_inode); |
Dave Hansen | 9ac9b84 | 2008-02-15 14:37:52 -0800 | [diff] [blame] | 124 | mnt_drop_write_and_out: |
David Howells | a02de96 | 2012-12-20 21:52:36 +0000 | [diff] [blame] | 125 | mnt_drop_write(path->mnt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 126 | out: |
| 127 | return error; |
| 128 | } |
David Howells | a02de96 | 2012-12-20 21:52:36 +0000 | [diff] [blame] | 129 | EXPORT_SYMBOL_GPL(vfs_truncate); |
| 130 | |
| 131 | static long do_sys_truncate(const char __user *pathname, loff_t length) |
| 132 | { |
Jeff Layton | 48f7530 | 2012-12-11 12:10:11 -0500 | [diff] [blame] | 133 | unsigned int lookup_flags = LOOKUP_FOLLOW; |
David Howells | a02de96 | 2012-12-20 21:52:36 +0000 | [diff] [blame] | 134 | struct path path; |
| 135 | int error; |
| 136 | |
| 137 | if (length < 0) /* sorry, but loff_t says... */ |
| 138 | return -EINVAL; |
| 139 | |
Jeff Layton | 48f7530 | 2012-12-11 12:10:11 -0500 | [diff] [blame] | 140 | retry: |
| 141 | error = user_path_at(AT_FDCWD, pathname, lookup_flags, &path); |
David Howells | a02de96 | 2012-12-20 21:52:36 +0000 | [diff] [blame] | 142 | if (!error) { |
| 143 | error = vfs_truncate(&path, length); |
| 144 | path_put(&path); |
| 145 | } |
Jeff Layton | 48f7530 | 2012-12-11 12:10:11 -0500 | [diff] [blame] | 146 | if (retry_estale(error, lookup_flags)) { |
| 147 | lookup_flags |= LOOKUP_REVAL; |
| 148 | goto retry; |
| 149 | } |
David Howells | a02de96 | 2012-12-20 21:52:36 +0000 | [diff] [blame] | 150 | return error; |
| 151 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 152 | |
Heiko Carstens | 4fd8da8 | 2009-09-23 17:49:55 +0200 | [diff] [blame] | 153 | SYSCALL_DEFINE2(truncate, const char __user *, path, long, length) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 154 | { |
Heiko Carstens | 4fd8da8 | 2009-09-23 17:49:55 +0200 | [diff] [blame] | 155 | return do_sys_truncate(path, length); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 156 | } |
| 157 | |
Al Viro | 3f6d078 | 2013-02-24 13:49:08 -0500 | [diff] [blame] | 158 | #ifdef CONFIG_COMPAT |
| 159 | COMPAT_SYSCALL_DEFINE2(truncate, const char __user *, path, compat_off_t, length) |
| 160 | { |
| 161 | return do_sys_truncate(path, length); |
| 162 | } |
| 163 | #endif |
| 164 | |
Matt Mackall | b01ec0e | 2006-01-08 01:05:20 -0800 | [diff] [blame] | 165 | 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] | 166 | { |
Al Viro | bf2965d | 2012-08-26 20:13:36 -0400 | [diff] [blame] | 167 | struct inode *inode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 168 | struct dentry *dentry; |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 169 | struct fd f; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 170 | int error; |
| 171 | |
| 172 | error = -EINVAL; |
| 173 | if (length < 0) |
| 174 | goto out; |
| 175 | error = -EBADF; |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 176 | f = fdget(fd); |
| 177 | if (!f.file) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 178 | goto out; |
| 179 | |
| 180 | /* explicitly opened as large or we are on 64-bit box */ |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 181 | if (f.file->f_flags & O_LARGEFILE) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 182 | small = 0; |
| 183 | |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 184 | dentry = f.file->f_path.dentry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 185 | inode = dentry->d_inode; |
| 186 | error = -EINVAL; |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 187 | if (!S_ISREG(inode->i_mode) || !(f.file->f_mode & FMODE_WRITE)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 188 | goto out_putf; |
| 189 | |
| 190 | error = -EINVAL; |
| 191 | /* Cannot ftruncate over 2^31 bytes without large file support */ |
| 192 | if (small && length > MAX_NON_LFS) |
| 193 | goto out_putf; |
| 194 | |
| 195 | error = -EPERM; |
Amir Goldstein | 78757af | 2017-04-08 14:49:06 +0300 | [diff] [blame] | 196 | /* Check IS_APPEND on real upper inode */ |
| 197 | if (IS_APPEND(file_inode(f.file))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 198 | goto out_putf; |
| 199 | |
Jan Kara | 14da920 | 2012-06-12 16:20:37 +0200 | [diff] [blame] | 200 | sb_start_write(inode->i_sb); |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 201 | error = locks_verify_truncate(inode, f.file, length); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 202 | if (!error) |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 203 | error = security_path_truncate(&f.file->f_path); |
Kentaro Takeda | be6d3e5 | 2008-12-17 13:24:15 +0900 | [diff] [blame] | 204 | if (!error) |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 205 | error = do_truncate(dentry, length, ATTR_MTIME|ATTR_CTIME, f.file); |
Jan Kara | 14da920 | 2012-06-12 16:20:37 +0200 | [diff] [blame] | 206 | sb_end_write(inode->i_sb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 207 | out_putf: |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 208 | fdput(f); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 209 | out: |
| 210 | return error; |
| 211 | } |
| 212 | |
Heiko Carstens | bdc480e | 2009-01-14 14:14:12 +0100 | [diff] [blame] | 213 | SYSCALL_DEFINE2(ftruncate, unsigned int, fd, unsigned long, length) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 214 | { |
Al Viro | 2cf0966 | 2013-01-21 15:25:54 -0500 | [diff] [blame] | 215 | return do_sys_ftruncate(fd, length, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 216 | } |
| 217 | |
Al Viro | 3f6d078 | 2013-02-24 13:49:08 -0500 | [diff] [blame] | 218 | #ifdef CONFIG_COMPAT |
| 219 | COMPAT_SYSCALL_DEFINE2(ftruncate, unsigned int, fd, compat_ulong_t, length) |
| 220 | { |
| 221 | return do_sys_ftruncate(fd, length, 1); |
| 222 | } |
| 223 | #endif |
| 224 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 225 | /* LFS versions of truncate are only needed on 32 bit machines */ |
| 226 | #if BITS_PER_LONG == 32 |
Al Viro | 4a0fd5b | 2013-01-21 15:16:58 -0500 | [diff] [blame] | 227 | SYSCALL_DEFINE2(truncate64, const char __user *, path, loff_t, length) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 228 | { |
| 229 | return do_sys_truncate(path, length); |
| 230 | } |
| 231 | |
Al Viro | 4a0fd5b | 2013-01-21 15:16:58 -0500 | [diff] [blame] | 232 | SYSCALL_DEFINE2(ftruncate64, unsigned int, fd, loff_t, length) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 233 | { |
Al Viro | 2cf0966 | 2013-01-21 15:25:54 -0500 | [diff] [blame] | 234 | return do_sys_ftruncate(fd, length, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 235 | } |
Heiko Carstens | 6673e0c | 2009-01-14 14:14:02 +0100 | [diff] [blame] | 236 | #endif /* BITS_PER_LONG == 32 */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 237 | |
Ankit Jain | 3e63cbb | 2009-06-19 14:28:07 -0400 | [diff] [blame] | 238 | |
Anna Schumaker | 72c72bd | 2014-11-07 14:44:25 -0500 | [diff] [blame] | 239 | int vfs_fallocate(struct file *file, int mode, loff_t offset, loff_t len) |
Amit Arora | 97ac735 | 2007-07-17 21:42:44 -0400 | [diff] [blame] | 240 | { |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 241 | struct inode *inode = file_inode(file); |
Ankit Jain | 3e63cbb | 2009-06-19 14:28:07 -0400 | [diff] [blame] | 242 | long ret; |
Amit Arora | 97ac735 | 2007-07-17 21:42:44 -0400 | [diff] [blame] | 243 | |
| 244 | if (offset < 0 || len <= 0) |
Ankit Jain | 3e63cbb | 2009-06-19 14:28:07 -0400 | [diff] [blame] | 245 | return -EINVAL; |
Amit Arora | 97ac735 | 2007-07-17 21:42:44 -0400 | [diff] [blame] | 246 | |
| 247 | /* Return error if mode is not supported */ |
Namjae Jeon | dd46c78 | 2015-03-25 15:07:05 +1100 | [diff] [blame] | 248 | if (mode & ~FALLOC_FL_SUPPORTED_MASK) |
Lukas Czerner | 409332b | 2014-03-13 19:07:42 +1100 | [diff] [blame] | 249 | return -EOPNOTSUPP; |
| 250 | |
| 251 | /* Punch hole and zero range are mutually exclusive */ |
| 252 | if ((mode & (FALLOC_FL_PUNCH_HOLE | FALLOC_FL_ZERO_RANGE)) == |
| 253 | (FALLOC_FL_PUNCH_HOLE | FALLOC_FL_ZERO_RANGE)) |
Josef Bacik | 79124f18 | 2010-11-17 20:46:15 -0500 | [diff] [blame] | 254 | return -EOPNOTSUPP; |
| 255 | |
| 256 | /* Punch hole must have keep size set */ |
| 257 | if ((mode & FALLOC_FL_PUNCH_HOLE) && |
| 258 | !(mode & FALLOC_FL_KEEP_SIZE)) |
Ankit Jain | 3e63cbb | 2009-06-19 14:28:07 -0400 | [diff] [blame] | 259 | return -EOPNOTSUPP; |
Amit Arora | 97ac735 | 2007-07-17 21:42:44 -0400 | [diff] [blame] | 260 | |
Namjae Jeon | 00f5e61 | 2014-02-24 10:58:15 +1100 | [diff] [blame] | 261 | /* Collapse range should only be used exclusively. */ |
| 262 | if ((mode & FALLOC_FL_COLLAPSE_RANGE) && |
| 263 | (mode & ~FALLOC_FL_COLLAPSE_RANGE)) |
| 264 | return -EINVAL; |
| 265 | |
Namjae Jeon | dd46c78 | 2015-03-25 15:07:05 +1100 | [diff] [blame] | 266 | /* Insert range should only be used exclusively. */ |
| 267 | if ((mode & FALLOC_FL_INSERT_RANGE) && |
| 268 | (mode & ~FALLOC_FL_INSERT_RANGE)) |
| 269 | return -EINVAL; |
| 270 | |
Darrick J. Wong | 71be6b4 | 2016-10-03 09:11:14 -0700 | [diff] [blame] | 271 | /* Unshare range should only be used with allocate mode. */ |
| 272 | if ((mode & FALLOC_FL_UNSHARE_RANGE) && |
| 273 | (mode & ~(FALLOC_FL_UNSHARE_RANGE | FALLOC_FL_KEEP_SIZE))) |
| 274 | return -EINVAL; |
| 275 | |
Amit Arora | 97ac735 | 2007-07-17 21:42:44 -0400 | [diff] [blame] | 276 | if (!(file->f_mode & FMODE_WRITE)) |
Ankit Jain | 3e63cbb | 2009-06-19 14:28:07 -0400 | [diff] [blame] | 277 | return -EBADF; |
Marco Stornelli | 1ca551c | 2011-03-05 11:10:19 +0100 | [diff] [blame] | 278 | |
Namjae Jeon | 00f5e61 | 2014-02-24 10:58:15 +1100 | [diff] [blame] | 279 | /* |
Lukas Czerner | 8fc61d9 | 2014-04-12 09:51:34 -0400 | [diff] [blame] | 280 | * We can only allow pure fallocate on append only files |
Namjae Jeon | 00f5e61 | 2014-02-24 10:58:15 +1100 | [diff] [blame] | 281 | */ |
Lukas Czerner | 8fc61d9 | 2014-04-12 09:51:34 -0400 | [diff] [blame] | 282 | if ((mode & ~FALLOC_FL_KEEP_SIZE) && IS_APPEND(inode)) |
Marco Stornelli | 1ca551c | 2011-03-05 11:10:19 +0100 | [diff] [blame] | 283 | return -EPERM; |
| 284 | |
| 285 | if (IS_IMMUTABLE(inode)) |
| 286 | return -EPERM; |
| 287 | |
Amit Arora | 97ac735 | 2007-07-17 21:42:44 -0400 | [diff] [blame] | 288 | /* |
Eric Biggers | 6d2b617 | 2014-06-24 23:45:08 -0500 | [diff] [blame] | 289 | * We cannot allow any fallocate operation on an active swapfile |
Lukas Czerner | 0790b31 | 2014-04-12 10:05:37 -0400 | [diff] [blame] | 290 | */ |
| 291 | if (IS_SWAPFILE(inode)) |
Eric Biggers | 6d2b617 | 2014-06-24 23:45:08 -0500 | [diff] [blame] | 292 | return -ETXTBSY; |
Lukas Czerner | 0790b31 | 2014-04-12 10:05:37 -0400 | [diff] [blame] | 293 | |
| 294 | /* |
Amit Arora | 97ac735 | 2007-07-17 21:42:44 -0400 | [diff] [blame] | 295 | * Revalidate the write permissions, in case security policy has |
| 296 | * changed since the files were opened. |
| 297 | */ |
| 298 | ret = security_file_permission(file, MAY_WRITE); |
| 299 | if (ret) |
Ankit Jain | 3e63cbb | 2009-06-19 14:28:07 -0400 | [diff] [blame] | 300 | return ret; |
Amit Arora | 97ac735 | 2007-07-17 21:42:44 -0400 | [diff] [blame] | 301 | |
Amit Arora | 97ac735 | 2007-07-17 21:42:44 -0400 | [diff] [blame] | 302 | if (S_ISFIFO(inode->i_mode)) |
Ankit Jain | 3e63cbb | 2009-06-19 14:28:07 -0400 | [diff] [blame] | 303 | return -ESPIPE; |
Amit Arora | 97ac735 | 2007-07-17 21:42:44 -0400 | [diff] [blame] | 304 | |
Amir Goldstein | 9e79b13 | 2017-01-31 10:34:55 +0200 | [diff] [blame] | 305 | if (S_ISDIR(inode->i_mode)) |
| 306 | return -EISDIR; |
| 307 | |
| 308 | if (!S_ISREG(inode->i_mode) && !S_ISBLK(inode->i_mode)) |
Ankit Jain | 3e63cbb | 2009-06-19 14:28:07 -0400 | [diff] [blame] | 309 | return -ENODEV; |
Amit Arora | 97ac735 | 2007-07-17 21:42:44 -0400 | [diff] [blame] | 310 | |
Amit Arora | 97ac735 | 2007-07-17 21:42:44 -0400 | [diff] [blame] | 311 | /* Check for wrap through zero too */ |
| 312 | if (((offset + len) > inode->i_sb->s_maxbytes) || ((offset + len) < 0)) |
Ankit Jain | 3e63cbb | 2009-06-19 14:28:07 -0400 | [diff] [blame] | 313 | return -EFBIG; |
Amit Arora | 97ac735 | 2007-07-17 21:42:44 -0400 | [diff] [blame] | 314 | |
Christoph Hellwig | 2fe17c1 | 2011-01-14 13:07:43 +0100 | [diff] [blame] | 315 | if (!file->f_op->fallocate) |
Ankit Jain | 3e63cbb | 2009-06-19 14:28:07 -0400 | [diff] [blame] | 316 | return -EOPNOTSUPP; |
Amit Arora | 97ac735 | 2007-07-17 21:42:44 -0400 | [diff] [blame] | 317 | |
Amir Goldstein | bfe219d | 2017-01-31 10:34:57 +0200 | [diff] [blame] | 318 | file_start_write(file); |
Jan Kara | 14da920 | 2012-06-12 16:20:37 +0200 | [diff] [blame] | 319 | ret = file->f_op->fallocate(file, mode, offset, len); |
Heinrich Schuchardt | 820c12d | 2014-12-12 16:58:34 -0800 | [diff] [blame] | 320 | |
| 321 | /* |
| 322 | * Create inotify and fanotify events. |
| 323 | * |
| 324 | * To keep the logic simple always create events if fallocate succeeds. |
| 325 | * This implies that events are even created if the file size remains |
| 326 | * unchanged, e.g. when using flag FALLOC_FL_KEEP_SIZE. |
| 327 | */ |
| 328 | if (ret == 0) |
| 329 | fsnotify_modify(file); |
| 330 | |
Amir Goldstein | bfe219d | 2017-01-31 10:34:57 +0200 | [diff] [blame] | 331 | file_end_write(file); |
Jan Kara | 14da920 | 2012-06-12 16:20:37 +0200 | [diff] [blame] | 332 | return ret; |
Amit Arora | 97ac735 | 2007-07-17 21:42:44 -0400 | [diff] [blame] | 333 | } |
Anna Schumaker | 72c72bd | 2014-11-07 14:44:25 -0500 | [diff] [blame] | 334 | EXPORT_SYMBOL_GPL(vfs_fallocate); |
Ankit Jain | 3e63cbb | 2009-06-19 14:28:07 -0400 | [diff] [blame] | 335 | |
Al Viro | 4a0fd5b | 2013-01-21 15:16:58 -0500 | [diff] [blame] | 336 | SYSCALL_DEFINE4(fallocate, int, fd, int, mode, loff_t, offset, loff_t, len) |
Ankit Jain | 3e63cbb | 2009-06-19 14:28:07 -0400 | [diff] [blame] | 337 | { |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 338 | struct fd f = fdget(fd); |
Ankit Jain | 3e63cbb | 2009-06-19 14:28:07 -0400 | [diff] [blame] | 339 | int error = -EBADF; |
| 340 | |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 341 | if (f.file) { |
Anna Schumaker | 72c72bd | 2014-11-07 14:44:25 -0500 | [diff] [blame] | 342 | error = vfs_fallocate(f.file, mode, offset, len); |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 343 | fdput(f); |
Ankit Jain | 3e63cbb | 2009-06-19 14:28:07 -0400 | [diff] [blame] | 344 | } |
Ankit Jain | 3e63cbb | 2009-06-19 14:28:07 -0400 | [diff] [blame] | 345 | return error; |
| 346 | } |
| 347 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 348 | /* |
| 349 | * access() needs to use the real uid/gid, not the effective uid/gid. |
| 350 | * We do this by temporarily clearing all FS-related capabilities and |
| 351 | * switching the fsuid/fsgid around to the real ones. |
| 352 | */ |
Heiko Carstens | 6559eed8 | 2009-01-14 14:14:32 +0100 | [diff] [blame] | 353 | SYSCALL_DEFINE3(faccessat, int, dfd, const char __user *, filename, int, mode) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 354 | { |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 355 | const struct cred *old_cred; |
| 356 | struct cred *override_cred; |
Al Viro | 2d8f303 | 2008-07-22 09:59:21 -0400 | [diff] [blame] | 357 | struct path path; |
Al Viro | 256984a | 2008-07-22 08:09:30 -0400 | [diff] [blame] | 358 | struct inode *inode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 359 | int res; |
Jeff Layton | 87fa559 | 2012-12-11 12:10:11 -0500 | [diff] [blame] | 360 | unsigned int lookup_flags = LOOKUP_FOLLOW; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 361 | |
| 362 | if (mode & ~S_IRWXO) /* where's F_OK, X_OK, W_OK, R_OK? */ |
| 363 | return -EINVAL; |
| 364 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 365 | override_cred = prepare_creds(); |
| 366 | if (!override_cred) |
| 367 | return -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 368 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 369 | override_cred->fsuid = override_cred->uid; |
| 370 | override_cred->fsgid = override_cred->gid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 371 | |
Andrew G. Morgan | 086f731 | 2008-07-04 09:59:58 -0700 | [diff] [blame] | 372 | if (!issecure(SECURE_NO_SETUID_FIXUP)) { |
David Howells | 1cdcbec | 2008-11-14 10:39:14 +1100 | [diff] [blame] | 373 | /* Clear the capabilities if we switch to a non-root user */ |
Eric W. Biederman | 18815a1 | 2012-02-07 16:45:47 -0800 | [diff] [blame] | 374 | kuid_t root_uid = make_kuid(override_cred->user_ns, 0); |
| 375 | if (!uid_eq(override_cred->uid, root_uid)) |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 376 | cap_clear(override_cred->cap_effective); |
Andrew G. Morgan | 086f731 | 2008-07-04 09:59:58 -0700 | [diff] [blame] | 377 | else |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 378 | override_cred->cap_effective = |
| 379 | override_cred->cap_permitted; |
Andrew G. Morgan | 086f731 | 2008-07-04 09:59:58 -0700 | [diff] [blame] | 380 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 381 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 382 | old_cred = override_creds(override_cred); |
Jeff Layton | 87fa559 | 2012-12-11 12:10:11 -0500 | [diff] [blame] | 383 | retry: |
| 384 | res = user_path_at(dfd, filename, lookup_flags, &path); |
Dave Hansen | 6902d92 | 2006-09-30 23:29:01 -0700 | [diff] [blame] | 385 | if (res) |
| 386 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 387 | |
David Howells | 63afdfc | 2015-05-06 15:59:00 +0100 | [diff] [blame] | 388 | inode = d_backing_inode(path.dentry); |
Al Viro | 256984a | 2008-07-22 08:09:30 -0400 | [diff] [blame] | 389 | |
| 390 | if ((mode & MAY_EXEC) && S_ISREG(inode->i_mode)) { |
Al Viro | 3052447 | 2008-07-22 00:02:33 -0400 | [diff] [blame] | 391 | /* |
| 392 | * MAY_EXEC on regular files is denied if the fs is mounted |
| 393 | * with the "noexec" flag. |
| 394 | */ |
| 395 | res = -EACCES; |
Eric W. Biederman | 90f8572 | 2015-06-29 14:42:03 -0500 | [diff] [blame] | 396 | if (path_noexec(&path)) |
Al Viro | 3052447 | 2008-07-22 00:02:33 -0400 | [diff] [blame] | 397 | goto out_path_release; |
| 398 | } |
| 399 | |
Al Viro | 256984a | 2008-07-22 08:09:30 -0400 | [diff] [blame] | 400 | res = inode_permission(inode, mode | MAY_ACCESS); |
Dave Hansen | 6902d92 | 2006-09-30 23:29:01 -0700 | [diff] [blame] | 401 | /* SuS v2 requires we report a read only fs too */ |
Al Viro | 256984a | 2008-07-22 08:09:30 -0400 | [diff] [blame] | 402 | if (res || !(mode & S_IWOTH) || special_file(inode->i_mode)) |
Dave Hansen | 6902d92 | 2006-09-30 23:29:01 -0700 | [diff] [blame] | 403 | goto out_path_release; |
Dave Hansen | 2f676cb | 2008-02-15 14:37:55 -0800 | [diff] [blame] | 404 | /* |
| 405 | * This is a rare case where using __mnt_is_readonly() |
| 406 | * is OK without a mnt_want/drop_write() pair. Since |
| 407 | * no actual write to the fs is performed here, we do |
| 408 | * not need to telegraph to that to anyone. |
| 409 | * |
| 410 | * By doing this, we accept that this access is |
| 411 | * inherently racy and know that the fs may change |
| 412 | * state before we even see this result. |
| 413 | */ |
Al Viro | 2d8f303 | 2008-07-22 09:59:21 -0400 | [diff] [blame] | 414 | if (__mnt_is_readonly(path.mnt)) |
Dave Hansen | 6902d92 | 2006-09-30 23:29:01 -0700 | [diff] [blame] | 415 | res = -EROFS; |
| 416 | |
| 417 | out_path_release: |
Al Viro | 2d8f303 | 2008-07-22 09:59:21 -0400 | [diff] [blame] | 418 | path_put(&path); |
Jeff Layton | 87fa559 | 2012-12-11 12:10:11 -0500 | [diff] [blame] | 419 | if (retry_estale(res, lookup_flags)) { |
| 420 | lookup_flags |= LOOKUP_REVAL; |
| 421 | goto retry; |
| 422 | } |
Dave Hansen | 6902d92 | 2006-09-30 23:29:01 -0700 | [diff] [blame] | 423 | out: |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 424 | revert_creds(old_cred); |
| 425 | put_cred(override_cred); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 426 | return res; |
| 427 | } |
| 428 | |
Heiko Carstens | ca013e9 | 2009-01-14 14:14:19 +0100 | [diff] [blame] | 429 | SYSCALL_DEFINE2(access, const char __user *, filename, int, mode) |
Ulrich Drepper | 5590ff0 | 2006-01-18 17:43:53 -0800 | [diff] [blame] | 430 | { |
| 431 | return sys_faccessat(AT_FDCWD, filename, mode); |
| 432 | } |
| 433 | |
Heiko Carstens | 3cdad42 | 2009-01-14 14:14:22 +0100 | [diff] [blame] | 434 | SYSCALL_DEFINE1(chdir, const char __user *, filename) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 435 | { |
Al Viro | 2d8f303 | 2008-07-22 09:59:21 -0400 | [diff] [blame] | 436 | struct path path; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 437 | int error; |
Jeff Layton | 0291c0a | 2012-12-11 12:10:12 -0500 | [diff] [blame] | 438 | unsigned int lookup_flags = LOOKUP_FOLLOW | LOOKUP_DIRECTORY; |
| 439 | retry: |
| 440 | error = user_path_at(AT_FDCWD, filename, lookup_flags, &path); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 441 | if (error) |
| 442 | goto out; |
| 443 | |
Eric Paris | 9cfcac8 | 2010-07-23 11:43:51 -0400 | [diff] [blame] | 444 | error = inode_permission(path.dentry->d_inode, MAY_EXEC | MAY_CHDIR); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 445 | if (error) |
| 446 | goto dput_and_out; |
| 447 | |
Al Viro | 2d8f303 | 2008-07-22 09:59:21 -0400 | [diff] [blame] | 448 | set_fs_pwd(current->fs, &path); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 449 | |
| 450 | dput_and_out: |
Al Viro | 2d8f303 | 2008-07-22 09:59:21 -0400 | [diff] [blame] | 451 | path_put(&path); |
Jeff Layton | 0291c0a | 2012-12-11 12:10:12 -0500 | [diff] [blame] | 452 | if (retry_estale(error, lookup_flags)) { |
| 453 | lookup_flags |= LOOKUP_REVAL; |
| 454 | goto retry; |
| 455 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 456 | out: |
| 457 | return error; |
| 458 | } |
| 459 | |
Heiko Carstens | 3cdad42 | 2009-01-14 14:14:22 +0100 | [diff] [blame] | 460 | SYSCALL_DEFINE1(fchdir, unsigned int, fd) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 461 | { |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 462 | struct fd f = fdget_raw(fd); |
Al Viro | 159b095 | 2017-04-15 15:58:56 -0400 | [diff] [blame] | 463 | int error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 464 | |
| 465 | error = -EBADF; |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 466 | if (!f.file) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 467 | goto out; |
| 468 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 469 | error = -ENOTDIR; |
Al Viro | 159b095 | 2017-04-15 15:58:56 -0400 | [diff] [blame] | 470 | if (!d_can_lookup(f.file->f_path.dentry)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 471 | goto out_putf; |
| 472 | |
Al Viro | 159b095 | 2017-04-15 15:58:56 -0400 | [diff] [blame] | 473 | error = inode_permission(file_inode(f.file), MAY_EXEC | MAY_CHDIR); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 474 | if (!error) |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 475 | set_fs_pwd(current->fs, &f.file->f_path); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 476 | out_putf: |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 477 | fdput(f); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 478 | out: |
| 479 | return error; |
| 480 | } |
| 481 | |
Heiko Carstens | 3480b25 | 2009-01-14 14:14:16 +0100 | [diff] [blame] | 482 | SYSCALL_DEFINE1(chroot, const char __user *, filename) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 483 | { |
Al Viro | 2d8f303 | 2008-07-22 09:59:21 -0400 | [diff] [blame] | 484 | struct path path; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 485 | int error; |
Jeff Layton | 2771261 | 2012-12-20 17:08:32 -0500 | [diff] [blame] | 486 | unsigned int lookup_flags = LOOKUP_FOLLOW | LOOKUP_DIRECTORY; |
| 487 | retry: |
| 488 | error = user_path_at(AT_FDCWD, filename, lookup_flags, &path); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 489 | if (error) |
| 490 | goto out; |
| 491 | |
Eric Paris | 9cfcac8 | 2010-07-23 11:43:51 -0400 | [diff] [blame] | 492 | error = inode_permission(path.dentry->d_inode, MAY_EXEC | MAY_CHDIR); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 493 | if (error) |
| 494 | goto dput_and_out; |
| 495 | |
| 496 | error = -EPERM; |
Eric W. Biederman | c7b96ac | 2013-03-20 12:49:49 -0700 | [diff] [blame] | 497 | if (!ns_capable(current_user_ns(), CAP_SYS_CHROOT)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 498 | goto dput_and_out; |
Tetsuo Handa | 8b8efb4 | 2009-10-04 21:49:48 +0900 | [diff] [blame] | 499 | error = security_path_chroot(&path); |
| 500 | if (error) |
| 501 | goto dput_and_out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 502 | |
Al Viro | 2d8f303 | 2008-07-22 09:59:21 -0400 | [diff] [blame] | 503 | set_fs_root(current->fs, &path); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 504 | error = 0; |
| 505 | dput_and_out: |
Al Viro | 2d8f303 | 2008-07-22 09:59:21 -0400 | [diff] [blame] | 506 | path_put(&path); |
Jeff Layton | 2771261 | 2012-12-20 17:08:32 -0500 | [diff] [blame] | 507 | if (retry_estale(error, lookup_flags)) { |
| 508 | lookup_flags |= LOOKUP_REVAL; |
| 509 | goto retry; |
| 510 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 511 | out: |
| 512 | return error; |
| 513 | } |
| 514 | |
Al Viro | be01f9f | 2016-03-25 14:56:23 -0400 | [diff] [blame] | 515 | static int chmod_common(const struct path *path, umode_t mode) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 516 | { |
Al Viro | e57712e | 2011-07-26 04:15:54 -0400 | [diff] [blame] | 517 | struct inode *inode = path->dentry->d_inode; |
J. Bruce Fields | 27ac0ff | 2011-09-20 17:19:26 -0400 | [diff] [blame] | 518 | struct inode *delegated_inode = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 519 | struct iattr newattrs; |
Al Viro | e57712e | 2011-07-26 04:15:54 -0400 | [diff] [blame] | 520 | int error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 521 | |
Al Viro | e57712e | 2011-07-26 04:15:54 -0400 | [diff] [blame] | 522 | error = mnt_want_write(path->mnt); |
| 523 | if (error) |
| 524 | return error; |
J. Bruce Fields | 27ac0ff | 2011-09-20 17:19:26 -0400 | [diff] [blame] | 525 | retry_deleg: |
Al Viro | 5955102 | 2016-01-22 15:40:57 -0500 | [diff] [blame] | 526 | inode_lock(inode); |
Al Viro | cdcf116 | 2011-12-08 10:51:53 -0500 | [diff] [blame] | 527 | error = security_path_chmod(path, mode); |
Al Viro | e57712e | 2011-07-26 04:15:54 -0400 | [diff] [blame] | 528 | if (error) |
Tetsuo Handa | fe542cf | 2009-11-22 11:49:55 +0900 | [diff] [blame] | 529 | goto out_unlock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 530 | newattrs.ia_mode = (mode & S_IALLUGO) | (inode->i_mode & ~S_IALLUGO); |
| 531 | newattrs.ia_valid = ATTR_MODE | ATTR_CTIME; |
J. Bruce Fields | 27ac0ff | 2011-09-20 17:19:26 -0400 | [diff] [blame] | 532 | error = notify_change(path->dentry, &newattrs, &delegated_inode); |
Tetsuo Handa | fe542cf | 2009-11-22 11:49:55 +0900 | [diff] [blame] | 533 | out_unlock: |
Al Viro | 5955102 | 2016-01-22 15:40:57 -0500 | [diff] [blame] | 534 | inode_unlock(inode); |
J. Bruce Fields | 27ac0ff | 2011-09-20 17:19:26 -0400 | [diff] [blame] | 535 | if (delegated_inode) { |
| 536 | error = break_deleg_wait(&delegated_inode); |
| 537 | if (!error) |
| 538 | goto retry_deleg; |
| 539 | } |
Al Viro | e57712e | 2011-07-26 04:15:54 -0400 | [diff] [blame] | 540 | mnt_drop_write(path->mnt); |
| 541 | return error; |
| 542 | } |
| 543 | |
Al Viro | 49f0a07 | 2011-07-26 04:22:01 -0400 | [diff] [blame] | 544 | SYSCALL_DEFINE2(fchmod, unsigned int, fd, umode_t, mode) |
Al Viro | e57712e | 2011-07-26 04:15:54 -0400 | [diff] [blame] | 545 | { |
Al Viro | 173c840 | 2013-08-30 12:48:53 -0400 | [diff] [blame] | 546 | struct fd f = fdget(fd); |
Al Viro | e57712e | 2011-07-26 04:15:54 -0400 | [diff] [blame] | 547 | int err = -EBADF; |
| 548 | |
Al Viro | 173c840 | 2013-08-30 12:48:53 -0400 | [diff] [blame] | 549 | if (f.file) { |
Al Viro | 9f45f5b | 2014-10-31 17:44:57 -0400 | [diff] [blame] | 550 | audit_file(f.file); |
Al Viro | 173c840 | 2013-08-30 12:48:53 -0400 | [diff] [blame] | 551 | err = chmod_common(&f.file->f_path, mode); |
| 552 | fdput(f); |
Al Viro | e57712e | 2011-07-26 04:15:54 -0400 | [diff] [blame] | 553 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 554 | return err; |
| 555 | } |
| 556 | |
Al Viro | 49f0a07 | 2011-07-26 04:22:01 -0400 | [diff] [blame] | 557 | SYSCALL_DEFINE3(fchmodat, int, dfd, const char __user *, filename, umode_t, mode) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 558 | { |
Al Viro | 2d8f303 | 2008-07-22 09:59:21 -0400 | [diff] [blame] | 559 | struct path path; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 560 | int error; |
Jeff Layton | 14ff690 | 2012-12-11 12:10:13 -0500 | [diff] [blame] | 561 | unsigned int lookup_flags = LOOKUP_FOLLOW; |
| 562 | retry: |
| 563 | error = user_path_at(dfd, filename, lookup_flags, &path); |
Al Viro | e57712e | 2011-07-26 04:15:54 -0400 | [diff] [blame] | 564 | if (!error) { |
| 565 | error = chmod_common(&path, mode); |
| 566 | path_put(&path); |
Jeff Layton | 14ff690 | 2012-12-11 12:10:13 -0500 | [diff] [blame] | 567 | if (retry_estale(error, lookup_flags)) { |
| 568 | lookup_flags |= LOOKUP_REVAL; |
| 569 | goto retry; |
| 570 | } |
Al Viro | e57712e | 2011-07-26 04:15:54 -0400 | [diff] [blame] | 571 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 572 | return error; |
| 573 | } |
| 574 | |
Al Viro | 49f0a07 | 2011-07-26 04:22:01 -0400 | [diff] [blame] | 575 | SYSCALL_DEFINE2(chmod, const char __user *, filename, umode_t, mode) |
Ulrich Drepper | 5590ff0 | 2006-01-18 17:43:53 -0800 | [diff] [blame] | 576 | { |
| 577 | return sys_fchmodat(AT_FDCWD, filename, mode); |
| 578 | } |
| 579 | |
Al Viro | 7fd25da | 2016-03-25 14:44:41 -0400 | [diff] [blame] | 580 | static int chown_common(const struct path *path, uid_t user, gid_t group) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 581 | { |
Tetsuo Handa | fe542cf | 2009-11-22 11:49:55 +0900 | [diff] [blame] | 582 | struct inode *inode = path->dentry->d_inode; |
J. Bruce Fields | 27ac0ff | 2011-09-20 17:19:26 -0400 | [diff] [blame] | 583 | struct inode *delegated_inode = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 584 | int error; |
| 585 | struct iattr newattrs; |
Eric W. Biederman | 52137ab | 2012-03-03 19:52:01 -0800 | [diff] [blame] | 586 | kuid_t uid; |
| 587 | kgid_t gid; |
| 588 | |
| 589 | uid = make_kuid(current_user_ns(), user); |
| 590 | gid = make_kgid(current_user_ns(), group); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 591 | |
Andrew Elble | c1b8940 | 2015-02-23 08:51:24 -0500 | [diff] [blame] | 592 | retry_deleg: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 593 | newattrs.ia_valid = ATTR_CTIME; |
| 594 | if (user != (uid_t) -1) { |
Eric W. Biederman | 52137ab | 2012-03-03 19:52:01 -0800 | [diff] [blame] | 595 | if (!uid_valid(uid)) |
| 596 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 597 | newattrs.ia_valid |= ATTR_UID; |
Eric W. Biederman | 52137ab | 2012-03-03 19:52:01 -0800 | [diff] [blame] | 598 | newattrs.ia_uid = uid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 599 | } |
| 600 | if (group != (gid_t) -1) { |
Eric W. Biederman | 52137ab | 2012-03-03 19:52:01 -0800 | [diff] [blame] | 601 | if (!gid_valid(gid)) |
| 602 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 603 | newattrs.ia_valid |= ATTR_GID; |
Eric W. Biederman | 52137ab | 2012-03-03 19:52:01 -0800 | [diff] [blame] | 604 | newattrs.ia_gid = gid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 605 | } |
| 606 | if (!S_ISDIR(inode->i_mode)) |
Serge E. Hallyn | b537677 | 2007-10-16 23:31:36 -0700 | [diff] [blame] | 607 | newattrs.ia_valid |= |
| 608 | ATTR_KILL_SUID | ATTR_KILL_SGID | ATTR_KILL_PRIV; |
Al Viro | 5955102 | 2016-01-22 15:40:57 -0500 | [diff] [blame] | 609 | inode_lock(inode); |
Eric W. Biederman | d2b31ca | 2012-06-01 16:14:19 -0600 | [diff] [blame] | 610 | error = security_path_chown(path, uid, gid); |
Tetsuo Handa | fe542cf | 2009-11-22 11:49:55 +0900 | [diff] [blame] | 611 | if (!error) |
J. Bruce Fields | 27ac0ff | 2011-09-20 17:19:26 -0400 | [diff] [blame] | 612 | error = notify_change(path->dentry, &newattrs, &delegated_inode); |
Al Viro | 5955102 | 2016-01-22 15:40:57 -0500 | [diff] [blame] | 613 | inode_unlock(inode); |
J. Bruce Fields | 27ac0ff | 2011-09-20 17:19:26 -0400 | [diff] [blame] | 614 | if (delegated_inode) { |
| 615 | error = break_deleg_wait(&delegated_inode); |
| 616 | if (!error) |
| 617 | goto retry_deleg; |
| 618 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 619 | return error; |
| 620 | } |
| 621 | |
Heiko Carstens | 6559eed8 | 2009-01-14 14:14:32 +0100 | [diff] [blame] | 622 | SYSCALL_DEFINE5(fchownat, int, dfd, const char __user *, filename, uid_t, user, |
| 623 | gid_t, group, int, flag) |
Ulrich Drepper | 5590ff0 | 2006-01-18 17:43:53 -0800 | [diff] [blame] | 624 | { |
Al Viro | 2d8f303 | 2008-07-22 09:59:21 -0400 | [diff] [blame] | 625 | struct path path; |
Ulrich Drepper | 5590ff0 | 2006-01-18 17:43:53 -0800 | [diff] [blame] | 626 | int error = -EINVAL; |
Al Viro | 65cfc67 | 2011-03-13 15:56:26 -0400 | [diff] [blame] | 627 | int lookup_flags; |
Ulrich Drepper | 5590ff0 | 2006-01-18 17:43:53 -0800 | [diff] [blame] | 628 | |
Al Viro | 65cfc67 | 2011-03-13 15:56:26 -0400 | [diff] [blame] | 629 | if ((flag & ~(AT_SYMLINK_NOFOLLOW | AT_EMPTY_PATH)) != 0) |
Ulrich Drepper | 5590ff0 | 2006-01-18 17:43:53 -0800 | [diff] [blame] | 630 | goto out; |
| 631 | |
Al Viro | 65cfc67 | 2011-03-13 15:56:26 -0400 | [diff] [blame] | 632 | lookup_flags = (flag & AT_SYMLINK_NOFOLLOW) ? 0 : LOOKUP_FOLLOW; |
| 633 | if (flag & AT_EMPTY_PATH) |
| 634 | lookup_flags |= LOOKUP_EMPTY; |
Jeff Layton | 99a5df3 | 2012-12-11 12:10:13 -0500 | [diff] [blame] | 635 | retry: |
Al Viro | 65cfc67 | 2011-03-13 15:56:26 -0400 | [diff] [blame] | 636 | error = user_path_at(dfd, filename, lookup_flags, &path); |
Dave Hansen | 6902d92 | 2006-09-30 23:29:01 -0700 | [diff] [blame] | 637 | if (error) |
| 638 | goto out; |
Al Viro | 2d8f303 | 2008-07-22 09:59:21 -0400 | [diff] [blame] | 639 | error = mnt_want_write(path.mnt); |
Dave Hansen | 2af482a | 2008-02-15 14:37:50 -0800 | [diff] [blame] | 640 | if (error) |
| 641 | goto out_release; |
Tetsuo Handa | fe542cf | 2009-11-22 11:49:55 +0900 | [diff] [blame] | 642 | error = chown_common(&path, user, group); |
Al Viro | 2d8f303 | 2008-07-22 09:59:21 -0400 | [diff] [blame] | 643 | mnt_drop_write(path.mnt); |
Dave Hansen | 2af482a | 2008-02-15 14:37:50 -0800 | [diff] [blame] | 644 | out_release: |
Al Viro | 2d8f303 | 2008-07-22 09:59:21 -0400 | [diff] [blame] | 645 | path_put(&path); |
Jeff Layton | 99a5df3 | 2012-12-11 12:10:13 -0500 | [diff] [blame] | 646 | if (retry_estale(error, lookup_flags)) { |
| 647 | lookup_flags |= LOOKUP_REVAL; |
| 648 | goto retry; |
| 649 | } |
Ulrich Drepper | 5590ff0 | 2006-01-18 17:43:53 -0800 | [diff] [blame] | 650 | out: |
| 651 | return error; |
| 652 | } |
| 653 | |
David Howells | 55e4def | 2012-06-25 12:55:09 +0100 | [diff] [blame] | 654 | SYSCALL_DEFINE3(chown, const char __user *, filename, uid_t, user, gid_t, group) |
| 655 | { |
| 656 | return sys_fchownat(AT_FDCWD, filename, user, group, 0); |
| 657 | } |
| 658 | |
Heiko Carstens | ca013e9 | 2009-01-14 14:14:19 +0100 | [diff] [blame] | 659 | 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] | 660 | { |
David Howells | 55e4def | 2012-06-25 12:55:09 +0100 | [diff] [blame] | 661 | return sys_fchownat(AT_FDCWD, filename, user, group, |
| 662 | AT_SYMLINK_NOFOLLOW); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 663 | } |
| 664 | |
Heiko Carstens | ca013e9 | 2009-01-14 14:14:19 +0100 | [diff] [blame] | 665 | SYSCALL_DEFINE3(fchown, unsigned int, fd, uid_t, user, gid_t, group) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 666 | { |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 667 | struct fd f = fdget(fd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 668 | int error = -EBADF; |
| 669 | |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 670 | if (!f.file) |
Dave Hansen | 6902d92 | 2006-09-30 23:29:01 -0700 | [diff] [blame] | 671 | goto out; |
| 672 | |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 673 | error = mnt_want_write_file(f.file); |
Dave Hansen | 2af482a | 2008-02-15 14:37:50 -0800 | [diff] [blame] | 674 | if (error) |
| 675 | goto out_fput; |
Al Viro | 9f45f5b | 2014-10-31 17:44:57 -0400 | [diff] [blame] | 676 | audit_file(f.file); |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 677 | error = chown_common(&f.file->f_path, user, group); |
| 678 | mnt_drop_write_file(f.file); |
Dave Hansen | 2af482a | 2008-02-15 14:37:50 -0800 | [diff] [blame] | 679 | out_fput: |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 680 | fdput(f); |
Dave Hansen | 6902d92 | 2006-09-30 23:29:01 -0700 | [diff] [blame] | 681 | out: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 682 | return error; |
| 683 | } |
| 684 | |
Miklos Szeredi | 90ad1a8 | 2012-05-21 17:30:15 +0200 | [diff] [blame] | 685 | int open_check_o_direct(struct file *f) |
| 686 | { |
| 687 | /* NB: we're sure to have correct a_ops only after f_op->open */ |
| 688 | if (f->f_flags & O_DIRECT) { |
Matthew Wilcox | e748dcd | 2015-02-16 15:59:12 -0800 | [diff] [blame] | 689 | if (!f->f_mapping->a_ops || !f->f_mapping->a_ops->direct_IO) |
Miklos Szeredi | 90ad1a8 | 2012-05-21 17:30:15 +0200 | [diff] [blame] | 690 | return -EINVAL; |
Miklos Szeredi | 90ad1a8 | 2012-05-21 17:30:15 +0200 | [diff] [blame] | 691 | } |
| 692 | return 0; |
| 693 | } |
| 694 | |
Al Viro | 02e5180 | 2012-06-10 14:32:45 -0400 | [diff] [blame] | 695 | static int do_dentry_open(struct file *f, |
David Howells | 4bacc9c | 2015-06-18 14:32:31 +0100 | [diff] [blame] | 696 | struct inode *inode, |
Al Viro | 96b7e57 | 2012-06-10 14:22:04 -0400 | [diff] [blame] | 697 | int (*open)(struct inode *, struct file *), |
| 698 | const struct cred *cred) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 699 | { |
Al Viro | 1abf0c7 | 2011-03-13 03:51:11 -0400 | [diff] [blame] | 700 | static const struct file_operations empty_fops = {}; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 701 | int error; |
| 702 | |
Al Viro | 5300990 | 2009-12-19 10:15:07 -0500 | [diff] [blame] | 703 | f->f_mode = OPEN_FMODE(f->f_flags) | FMODE_LSEEK | |
Peter Staubach | a1a5b3d | 2005-09-13 01:25:12 -0700 | [diff] [blame] | 704 | FMODE_PREAD | FMODE_PWRITE; |
Al Viro | 1abf0c7 | 2011-03-13 03:51:11 -0400 | [diff] [blame] | 705 | |
Al Viro | b5bcdda | 2012-07-20 23:28:46 +0400 | [diff] [blame] | 706 | path_get(&f->f_path); |
David Howells | 4bacc9c | 2015-06-18 14:32:31 +0100 | [diff] [blame] | 707 | f->f_inode = inode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 708 | f->f_mapping = inode->i_mapping; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 709 | |
Al Viro | 3f4d5a0 | 2014-03-14 09:43:29 -0400 | [diff] [blame] | 710 | if (unlikely(f->f_flags & O_PATH)) { |
| 711 | f->f_mode = FMODE_PATH; |
Al Viro | 1abf0c7 | 2011-03-13 03:51:11 -0400 | [diff] [blame] | 712 | f->f_op = &empty_fops; |
Al Viro | 96b7e57 | 2012-06-10 14:22:04 -0400 | [diff] [blame] | 713 | return 0; |
Al Viro | 1abf0c7 | 2011-03-13 03:51:11 -0400 | [diff] [blame] | 714 | } |
| 715 | |
Al Viro | dd20908 | 2014-03-14 10:56:20 -0400 | [diff] [blame] | 716 | if (f->f_mode & FMODE_WRITE && !special_file(inode->i_mode)) { |
Al Viro | 0ccb286 | 2014-03-14 10:40:46 -0400 | [diff] [blame] | 717 | error = get_write_access(inode); |
Al Viro | 3f4d5a0 | 2014-03-14 09:43:29 -0400 | [diff] [blame] | 718 | if (unlikely(error)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 719 | goto cleanup_file; |
Al Viro | 0ccb286 | 2014-03-14 10:40:46 -0400 | [diff] [blame] | 720 | error = __mnt_want_write(f->f_path.mnt); |
Al Viro | 3f4d5a0 | 2014-03-14 09:43:29 -0400 | [diff] [blame] | 721 | if (unlikely(error)) { |
Al Viro | 0ccb286 | 2014-03-14 10:40:46 -0400 | [diff] [blame] | 722 | put_write_access(inode); |
| 723 | goto cleanup_file; |
| 724 | } |
Al Viro | 83f936c | 2014-03-14 12:02:47 -0400 | [diff] [blame] | 725 | f->f_mode |= FMODE_WRITER; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 726 | } |
| 727 | |
Linus Torvalds | 9c225f2 | 2014-03-03 09:36:58 -0800 | [diff] [blame] | 728 | /* POSIX.1-2008/SUSv4 Section XSI 2.9.7 */ |
Al Viro | 63b6df1 | 2016-04-20 17:08:21 -0400 | [diff] [blame] | 729 | if (S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode)) |
Linus Torvalds | 9c225f2 | 2014-03-03 09:36:58 -0800 | [diff] [blame] | 730 | f->f_mode |= FMODE_ATOMIC_POS; |
| 731 | |
Al Viro | 1abf0c7 | 2011-03-13 03:51:11 -0400 | [diff] [blame] | 732 | f->f_op = fops_get(inode->i_fop); |
Al Viro | 72c2d53 | 2013-09-22 16:27:52 -0400 | [diff] [blame] | 733 | if (unlikely(WARN_ON(!f->f_op))) { |
| 734 | error = -ENODEV; |
| 735 | goto cleanup_all; |
| 736 | } |
Al Viro | 1abf0c7 | 2011-03-13 03:51:11 -0400 | [diff] [blame] | 737 | |
Eric Paris | 83d4985 | 2012-04-04 13:45:40 -0400 | [diff] [blame] | 738 | error = security_file_open(f, cred); |
Yuichi Nakamura | 788e7dd | 2007-09-14 09:27:07 +0900 | [diff] [blame] | 739 | if (error) |
| 740 | goto cleanup_all; |
| 741 | |
Miklos Szeredi | c568d68 | 2016-09-16 12:44:20 +0200 | [diff] [blame] | 742 | error = break_lease(locks_inode(f), f->f_flags); |
J. Bruce Fields | f3c7691e | 2011-09-21 10:58:13 -0400 | [diff] [blame] | 743 | if (error) |
| 744 | goto cleanup_all; |
| 745 | |
Al Viro | 72c2d53 | 2013-09-22 16:27:52 -0400 | [diff] [blame] | 746 | if (!open) |
Trond Myklebust | 834f2a4 | 2005-10-18 14:20:16 -0700 | [diff] [blame] | 747 | open = f->f_op->open; |
| 748 | if (open) { |
| 749 | error = open(inode, f); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 750 | if (error) |
| 751 | goto cleanup_all; |
| 752 | } |
Mimi Zohar | 890275b5 | 2010-11-02 10:13:07 -0400 | [diff] [blame] | 753 | if ((f->f_mode & (FMODE_READ | FMODE_WRITE)) == FMODE_READ) |
| 754 | i_readcount_inc(inode); |
Al Viro | 293bc98 | 2014-02-11 18:37:41 -0500 | [diff] [blame] | 755 | if ((f->f_mode & FMODE_READ) && |
Al Viro | 8436318 | 2015-04-04 01:14:53 -0400 | [diff] [blame] | 756 | likely(f->f_op->read || f->f_op->read_iter)) |
Al Viro | 7f7f25e | 2014-02-11 17:49:24 -0500 | [diff] [blame] | 757 | f->f_mode |= FMODE_CAN_READ; |
Al Viro | 293bc98 | 2014-02-11 18:37:41 -0500 | [diff] [blame] | 758 | if ((f->f_mode & FMODE_WRITE) && |
Al Viro | 8436318 | 2015-04-04 01:14:53 -0400 | [diff] [blame] | 759 | likely(f->f_op->write || f->f_op->write_iter)) |
Al Viro | 7f7f25e | 2014-02-11 17:49:24 -0500 | [diff] [blame] | 760 | f->f_mode |= FMODE_CAN_WRITE; |
Trond Myklebust | 834f2a4 | 2005-10-18 14:20:16 -0700 | [diff] [blame] | 761 | |
Jens Axboe | c75b1d9 | 2017-06-27 11:47:04 -0600 | [diff] [blame] | 762 | f->f_write_hint = WRITE_LIFE_NOT_SET; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 763 | f->f_flags &= ~(O_CREAT | O_EXCL | O_NOCTTY | O_TRUNC); |
| 764 | |
| 765 | file_ra_state_init(&f->f_ra, f->f_mapping->host->i_mapping); |
| 766 | |
Al Viro | 96b7e57 | 2012-06-10 14:22:04 -0400 | [diff] [blame] | 767 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 768 | |
| 769 | cleanup_all: |
| 770 | fops_put(f->f_op); |
Al Viro | 83f936c | 2014-03-14 12:02:47 -0400 | [diff] [blame] | 771 | if (f->f_mode & FMODE_WRITER) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 772 | put_write_access(inode); |
Al Viro | 83f936c | 2014-03-14 12:02:47 -0400 | [diff] [blame] | 773 | __mnt_drop_write(f->f_path.mnt); |
Dave Hansen | 4a3fd21 | 2008-02-15 14:37:48 -0800 | [diff] [blame] | 774 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 775 | cleanup_file: |
Al Viro | 02e5180 | 2012-06-10 14:32:45 -0400 | [diff] [blame] | 776 | path_put(&f->f_path); |
| 777 | f->f_path.mnt = NULL; |
| 778 | f->f_path.dentry = NULL; |
Al Viro | dd37978 | 2013-03-01 19:48:30 -0500 | [diff] [blame] | 779 | f->f_inode = NULL; |
Al Viro | 96b7e57 | 2012-06-10 14:22:04 -0400 | [diff] [blame] | 780 | return error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 781 | } |
| 782 | |
Trond Myklebust | 834f2a4 | 2005-10-18 14:20:16 -0700 | [diff] [blame] | 783 | /** |
Miklos Szeredi | d18e900 | 2012-06-05 15:10:17 +0200 | [diff] [blame] | 784 | * finish_open - finish opening a file |
Miklos Szeredi | 0854d45 | 2013-09-16 14:51:55 +0200 | [diff] [blame] | 785 | * @file: file pointer |
Miklos Szeredi | d18e900 | 2012-06-05 15:10:17 +0200 | [diff] [blame] | 786 | * @dentry: pointer to dentry |
| 787 | * @open: open callback |
Miklos Szeredi | 0854d45 | 2013-09-16 14:51:55 +0200 | [diff] [blame] | 788 | * @opened: state of open |
Miklos Szeredi | d18e900 | 2012-06-05 15:10:17 +0200 | [diff] [blame] | 789 | * |
| 790 | * This can be used to finish opening a file passed to i_op->atomic_open(). |
| 791 | * |
| 792 | * If the open callback is set to NULL, then the standard f_op->open() |
| 793 | * filesystem callback is substituted. |
Miklos Szeredi | 0854d45 | 2013-09-16 14:51:55 +0200 | [diff] [blame] | 794 | * |
| 795 | * NB: the dentry reference is _not_ consumed. If, for example, the dentry is |
| 796 | * the return value of d_splice_alias(), then the caller needs to perform dput() |
| 797 | * on it after finish_open(). |
| 798 | * |
| 799 | * On successful return @file is a fully instantiated open file. After this, if |
| 800 | * an error occurs in ->atomic_open(), it needs to clean up with fput(). |
| 801 | * |
| 802 | * Returns zero on success or -errno if the open failed. |
Miklos Szeredi | d18e900 | 2012-06-05 15:10:17 +0200 | [diff] [blame] | 803 | */ |
Al Viro | 30d9049 | 2012-06-22 12:40:19 +0400 | [diff] [blame] | 804 | int finish_open(struct file *file, struct dentry *dentry, |
| 805 | int (*open)(struct inode *, struct file *), |
| 806 | int *opened) |
Miklos Szeredi | d18e900 | 2012-06-05 15:10:17 +0200 | [diff] [blame] | 807 | { |
Al Viro | 96b7e57 | 2012-06-10 14:22:04 -0400 | [diff] [blame] | 808 | int error; |
Al Viro | 3d8a00d | 2012-06-10 05:04:43 -0400 | [diff] [blame] | 809 | BUG_ON(*opened & FILE_OPENED); /* once it's opened, it's opened */ |
Miklos Szeredi | d18e900 | 2012-06-05 15:10:17 +0200 | [diff] [blame] | 810 | |
Al Viro | b5bcdda | 2012-07-20 23:28:46 +0400 | [diff] [blame] | 811 | file->f_path.dentry = dentry; |
David Howells | 4bacc9c | 2015-06-18 14:32:31 +0100 | [diff] [blame] | 812 | error = do_dentry_open(file, d_backing_inode(dentry), open, |
| 813 | current_cred()); |
Al Viro | 96b7e57 | 2012-06-10 14:22:04 -0400 | [diff] [blame] | 814 | if (!error) |
Al Viro | 4723768 | 2012-06-10 05:01:45 -0400 | [diff] [blame] | 815 | *opened |= FILE_OPENED; |
Miklos Szeredi | d18e900 | 2012-06-05 15:10:17 +0200 | [diff] [blame] | 816 | |
Al Viro | 96b7e57 | 2012-06-10 14:22:04 -0400 | [diff] [blame] | 817 | return error; |
Miklos Szeredi | d18e900 | 2012-06-05 15:10:17 +0200 | [diff] [blame] | 818 | } |
| 819 | EXPORT_SYMBOL(finish_open); |
| 820 | |
| 821 | /** |
| 822 | * finish_no_open - finish ->atomic_open() without opening the file |
| 823 | * |
Miklos Szeredi | 0854d45 | 2013-09-16 14:51:55 +0200 | [diff] [blame] | 824 | * @file: file pointer |
Miklos Szeredi | d18e900 | 2012-06-05 15:10:17 +0200 | [diff] [blame] | 825 | * @dentry: dentry or NULL (as returned from ->lookup()) |
| 826 | * |
| 827 | * This can be used to set the result of a successful lookup in ->atomic_open(). |
Miklos Szeredi | 0854d45 | 2013-09-16 14:51:55 +0200 | [diff] [blame] | 828 | * |
| 829 | * NB: unlike finish_open() this function does consume the dentry reference and |
| 830 | * the caller need not dput() it. |
| 831 | * |
| 832 | * Returns "1" which must be the return value of ->atomic_open() after having |
| 833 | * called this function. |
Miklos Szeredi | d18e900 | 2012-06-05 15:10:17 +0200 | [diff] [blame] | 834 | */ |
Al Viro | e45198a | 2012-06-10 06:48:09 -0400 | [diff] [blame] | 835 | int finish_no_open(struct file *file, struct dentry *dentry) |
Miklos Szeredi | d18e900 | 2012-06-05 15:10:17 +0200 | [diff] [blame] | 836 | { |
Al Viro | 30d9049 | 2012-06-22 12:40:19 +0400 | [diff] [blame] | 837 | file->f_path.dentry = dentry; |
Al Viro | e45198a | 2012-06-10 06:48:09 -0400 | [diff] [blame] | 838 | return 1; |
Miklos Szeredi | d18e900 | 2012-06-05 15:10:17 +0200 | [diff] [blame] | 839 | } |
| 840 | EXPORT_SYMBOL(finish_no_open); |
| 841 | |
Miklos Szeredi | 9bf39ab | 2015-06-19 10:29:13 +0200 | [diff] [blame] | 842 | char *file_path(struct file *filp, char *buf, int buflen) |
| 843 | { |
| 844 | return d_path(&filp->f_path, buf, buflen); |
| 845 | } |
| 846 | EXPORT_SYMBOL(file_path); |
| 847 | |
David Howells | 4bacc9c | 2015-06-18 14:32:31 +0100 | [diff] [blame] | 848 | /** |
| 849 | * vfs_open - open the file at the given path |
| 850 | * @path: path to open |
| 851 | * @file: newly allocated file with f_flag initialized |
| 852 | * @cred: credentials to use |
| 853 | */ |
| 854 | int vfs_open(const struct path *path, struct file *file, |
| 855 | const struct cred *cred) |
| 856 | { |
Miklos Szeredi | 2d90267 | 2016-06-30 08:53:27 +0200 | [diff] [blame] | 857 | struct dentry *dentry = d_real(path->dentry, NULL, file->f_flags); |
Miklos Szeredi | 54d5ca8 | 2016-05-11 01:16:37 +0200 | [diff] [blame] | 858 | |
Miklos Szeredi | 2d90267 | 2016-06-30 08:53:27 +0200 | [diff] [blame] | 859 | if (IS_ERR(dentry)) |
| 860 | return PTR_ERR(dentry); |
David Howells | 4bacc9c | 2015-06-18 14:32:31 +0100 | [diff] [blame] | 861 | |
| 862 | file->f_path = *path; |
Miklos Szeredi | 2d90267 | 2016-06-30 08:53:27 +0200 | [diff] [blame] | 863 | return do_dentry_open(file, d_backing_inode(dentry), NULL, cred); |
David Howells | 4bacc9c | 2015-06-18 14:32:31 +0100 | [diff] [blame] | 864 | } |
| 865 | |
Al Viro | 765927b | 2012-06-26 21:58:53 +0400 | [diff] [blame] | 866 | struct file *dentry_open(const struct path *path, int flags, |
David Howells | 745ca24 | 2008-11-14 10:39:22 +1100 | [diff] [blame] | 867 | const struct cred *cred) |
Peter Staubach | a1a5b3d | 2005-09-13 01:25:12 -0700 | [diff] [blame] | 868 | { |
| 869 | int error; |
| 870 | struct file *f; |
| 871 | |
David Howells | e0e8173 | 2009-09-02 09:13:40 +0100 | [diff] [blame] | 872 | validate_creds(cred); |
| 873 | |
Tetsuo Handa | c212f9a | 2011-01-19 21:08:41 +0900 | [diff] [blame] | 874 | /* We must always pass in a valid mount pointer. */ |
Al Viro | 765927b | 2012-06-26 21:58:53 +0400 | [diff] [blame] | 875 | BUG_ON(!path->mnt); |
Christoph Hellwig | 322ee5b | 2008-02-15 14:37:24 -0800 | [diff] [blame] | 876 | |
Peter Staubach | a1a5b3d | 2005-09-13 01:25:12 -0700 | [diff] [blame] | 877 | f = get_empty_filp(); |
Al Viro | 1afc99b | 2013-02-14 20:41:04 -0500 | [diff] [blame] | 878 | if (!IS_ERR(f)) { |
| 879 | f->f_flags = flags; |
Miklos Szeredi | 4aa7c63 | 2014-10-24 00:14:35 +0200 | [diff] [blame] | 880 | error = vfs_open(path, f, cred); |
Al Viro | 1afc99b | 2013-02-14 20:41:04 -0500 | [diff] [blame] | 881 | if (!error) { |
| 882 | /* from now on we need fput() to dispose of f */ |
| 883 | error = open_check_o_direct(f); |
| 884 | if (error) { |
| 885 | fput(f); |
| 886 | f = ERR_PTR(error); |
| 887 | } |
| 888 | } else { |
| 889 | put_filp(f); |
Al Viro | 2a027e7 | 2012-06-10 14:24:38 -0400 | [diff] [blame] | 890 | f = ERR_PTR(error); |
| 891 | } |
Al Viro | 2a027e7 | 2012-06-10 14:24:38 -0400 | [diff] [blame] | 892 | } |
| 893 | return f; |
Peter Staubach | a1a5b3d | 2005-09-13 01:25:12 -0700 | [diff] [blame] | 894 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 895 | EXPORT_SYMBOL(dentry_open); |
| 896 | |
Al Viro | a218d0f | 2011-11-21 14:59:34 -0500 | [diff] [blame] | 897 | static inline int build_open_flags(int flags, umode_t mode, struct open_flags *op) |
Al Viro | 47c805d | 2011-02-23 17:44:09 -0500 | [diff] [blame] | 898 | { |
| 899 | int lookup_flags = 0; |
Al Viro | 62fb4a1 | 2015-12-26 22:33:24 -0500 | [diff] [blame] | 900 | int acc_mode = ACC_MODE(flags); |
Al Viro | 47c805d | 2011-02-23 17:44:09 -0500 | [diff] [blame] | 901 | |
Christoph Hellwig | 629e014 | 2017-04-27 09:42:25 +0200 | [diff] [blame] | 902 | /* |
| 903 | * Clear out all open flags we don't know about so that we don't report |
| 904 | * them in fcntl(F_GETFD) or similar interfaces. |
| 905 | */ |
| 906 | flags &= VALID_OPEN_FLAGS; |
| 907 | |
Andy Lutomirski | e305f48 | 2013-08-01 21:07:52 -0700 | [diff] [blame] | 908 | if (flags & (O_CREAT | __O_TMPFILE)) |
Miklos Szeredi | e68726f | 2012-08-15 13:01:24 +0200 | [diff] [blame] | 909 | op->mode = (mode & S_IALLUGO) | S_IFREG; |
| 910 | else |
| 911 | op->mode = 0; |
Al Viro | 47c805d | 2011-02-23 17:44:09 -0500 | [diff] [blame] | 912 | |
| 913 | /* Must never be set by userspace */ |
Al Viro | c6f3d81 | 2012-08-26 11:01:04 -0400 | [diff] [blame] | 914 | flags &= ~FMODE_NONOTIFY & ~O_CLOEXEC; |
Al Viro | 47c805d | 2011-02-23 17:44:09 -0500 | [diff] [blame] | 915 | |
| 916 | /* |
| 917 | * O_SYNC is implemented as __O_SYNC|O_DSYNC. As many places only |
| 918 | * check for O_DSYNC if the need any syncing at all we enforce it's |
| 919 | * always set instead of having to deal with possibly weird behaviour |
| 920 | * for malicious applications setting only __O_SYNC. |
| 921 | */ |
| 922 | if (flags & __O_SYNC) |
| 923 | flags |= O_DSYNC; |
| 924 | |
Al Viro | bb458c6 | 2013-07-13 13:26:37 +0400 | [diff] [blame] | 925 | if (flags & __O_TMPFILE) { |
| 926 | if ((flags & O_TMPFILE_MASK) != O_TMPFILE) |
Al Viro | 60545d0 | 2013-06-07 01:20:27 -0400 | [diff] [blame] | 927 | return -EINVAL; |
Al Viro | ba57ea6 | 2013-07-20 03:11:32 +0400 | [diff] [blame] | 928 | if (!(acc_mode & MAY_WRITE)) |
| 929 | return -EINVAL; |
Al Viro | 60545d0 | 2013-06-07 01:20:27 -0400 | [diff] [blame] | 930 | } else if (flags & O_PATH) { |
| 931 | /* |
| 932 | * If we have O_PATH in the open flag. Then we |
| 933 | * cannot have anything other than the below set of flags |
| 934 | */ |
Al Viro | 1abf0c7 | 2011-03-13 03:51:11 -0400 | [diff] [blame] | 935 | flags &= O_DIRECTORY | O_NOFOLLOW | O_PATH; |
| 936 | acc_mode = 0; |
Al Viro | 1abf0c7 | 2011-03-13 03:51:11 -0400 | [diff] [blame] | 937 | } |
Al Viro | 47c805d | 2011-02-23 17:44:09 -0500 | [diff] [blame] | 938 | |
Al Viro | 1abf0c7 | 2011-03-13 03:51:11 -0400 | [diff] [blame] | 939 | op->open_flag = flags; |
Al Viro | 47c805d | 2011-02-23 17:44:09 -0500 | [diff] [blame] | 940 | |
| 941 | /* O_TRUNC implies we need access checks for write permissions */ |
| 942 | if (flags & O_TRUNC) |
| 943 | acc_mode |= MAY_WRITE; |
| 944 | |
| 945 | /* Allow the LSM permission hook to distinguish append |
| 946 | access from general write access. */ |
| 947 | if (flags & O_APPEND) |
| 948 | acc_mode |= MAY_APPEND; |
| 949 | |
| 950 | op->acc_mode = acc_mode; |
| 951 | |
Al Viro | 1abf0c7 | 2011-03-13 03:51:11 -0400 | [diff] [blame] | 952 | op->intent = flags & O_PATH ? 0 : LOOKUP_OPEN; |
| 953 | |
Al Viro | 47c805d | 2011-02-23 17:44:09 -0500 | [diff] [blame] | 954 | if (flags & O_CREAT) { |
| 955 | op->intent |= LOOKUP_CREATE; |
| 956 | if (flags & O_EXCL) |
| 957 | op->intent |= LOOKUP_EXCL; |
| 958 | } |
| 959 | |
| 960 | if (flags & O_DIRECTORY) |
| 961 | lookup_flags |= LOOKUP_DIRECTORY; |
| 962 | if (!(flags & O_NOFOLLOW)) |
| 963 | lookup_flags |= LOOKUP_FOLLOW; |
Al Viro | f9652e1 | 2013-06-11 08:23:01 +0400 | [diff] [blame] | 964 | op->lookup_flags = lookup_flags; |
| 965 | return 0; |
Al Viro | 47c805d | 2011-02-23 17:44:09 -0500 | [diff] [blame] | 966 | } |
| 967 | |
| 968 | /** |
Jeff Layton | 669abf4 | 2012-10-10 16:43:10 -0400 | [diff] [blame] | 969 | * file_open_name - open file and return file pointer |
| 970 | * |
| 971 | * @name: struct filename containing path to open |
| 972 | * @flags: open flags as per the open(2) second argument |
| 973 | * @mode: mode for the new file if O_CREAT is set, else ignored |
| 974 | * |
| 975 | * This is the helper to open a file from kernelspace if you really |
| 976 | * have to. But in generally you should not do this, so please move |
| 977 | * along, nothing to see here.. |
| 978 | */ |
| 979 | struct file *file_open_name(struct filename *name, int flags, umode_t mode) |
| 980 | { |
| 981 | struct open_flags op; |
Al Viro | f9652e1 | 2013-06-11 08:23:01 +0400 | [diff] [blame] | 982 | int err = build_open_flags(flags, mode, &op); |
| 983 | return err ? ERR_PTR(err) : do_filp_open(AT_FDCWD, name, &op); |
Jeff Layton | 669abf4 | 2012-10-10 16:43:10 -0400 | [diff] [blame] | 984 | } |
| 985 | |
| 986 | /** |
Al Viro | 47c805d | 2011-02-23 17:44:09 -0500 | [diff] [blame] | 987 | * filp_open - open file and return file pointer |
| 988 | * |
| 989 | * @filename: path to open |
| 990 | * @flags: open flags as per the open(2) second argument |
| 991 | * @mode: mode for the new file if O_CREAT is set, else ignored |
| 992 | * |
| 993 | * This is the helper to open a file from kernelspace if you really |
| 994 | * have to. But in generally you should not do this, so please move |
| 995 | * along, nothing to see here.. |
| 996 | */ |
Al Viro | a218d0f | 2011-11-21 14:59:34 -0500 | [diff] [blame] | 997 | struct file *filp_open(const char *filename, int flags, umode_t mode) |
Al Viro | 47c805d | 2011-02-23 17:44:09 -0500 | [diff] [blame] | 998 | { |
Paul Moore | 5168910 | 2015-01-22 00:00:03 -0500 | [diff] [blame] | 999 | struct filename *name = getname_kernel(filename); |
| 1000 | struct file *file = ERR_CAST(name); |
| 1001 | |
| 1002 | if (!IS_ERR(name)) { |
| 1003 | file = file_open_name(name, flags, mode); |
| 1004 | putname(name); |
| 1005 | } |
| 1006 | return file; |
Al Viro | 47c805d | 2011-02-23 17:44:09 -0500 | [diff] [blame] | 1007 | } |
| 1008 | EXPORT_SYMBOL(filp_open); |
| 1009 | |
Al Viro | 73d049a | 2011-03-11 12:08:24 -0500 | [diff] [blame] | 1010 | struct file *file_open_root(struct dentry *dentry, struct vfsmount *mnt, |
Jann Horn | 378c652 | 2016-03-22 14:25:36 -0700 | [diff] [blame] | 1011 | const char *filename, int flags, umode_t mode) |
Al Viro | 73d049a | 2011-03-11 12:08:24 -0500 | [diff] [blame] | 1012 | { |
| 1013 | struct open_flags op; |
Jann Horn | 378c652 | 2016-03-22 14:25:36 -0700 | [diff] [blame] | 1014 | int err = build_open_flags(flags, mode, &op); |
Al Viro | f9652e1 | 2013-06-11 08:23:01 +0400 | [diff] [blame] | 1015 | if (err) |
| 1016 | return ERR_PTR(err); |
Al Viro | f9652e1 | 2013-06-11 08:23:01 +0400 | [diff] [blame] | 1017 | return do_file_open_root(dentry, mnt, filename, &op); |
Al Viro | 73d049a | 2011-03-11 12:08:24 -0500 | [diff] [blame] | 1018 | } |
| 1019 | EXPORT_SYMBOL(file_open_root); |
| 1020 | |
James Bottomley | 9a08c35 | 2016-02-17 16:49:38 -0800 | [diff] [blame] | 1021 | struct file *filp_clone_open(struct file *oldfile) |
| 1022 | { |
| 1023 | struct file *file; |
| 1024 | int retval; |
| 1025 | |
| 1026 | file = get_empty_filp(); |
| 1027 | if (IS_ERR(file)) |
| 1028 | return file; |
| 1029 | |
| 1030 | file->f_flags = oldfile->f_flags; |
| 1031 | retval = vfs_open(&oldfile->f_path, file, oldfile->f_cred); |
| 1032 | if (retval) { |
| 1033 | put_filp(file); |
| 1034 | return ERR_PTR(retval); |
| 1035 | } |
| 1036 | |
| 1037 | return file; |
| 1038 | } |
| 1039 | EXPORT_SYMBOL(filp_clone_open); |
| 1040 | |
Al Viro | a218d0f | 2011-11-21 14:59:34 -0500 | [diff] [blame] | 1041 | long do_sys_open(int dfd, const char __user *filename, int flags, umode_t mode) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1042 | { |
Al Viro | 47c805d | 2011-02-23 17:44:09 -0500 | [diff] [blame] | 1043 | struct open_flags op; |
Al Viro | f9652e1 | 2013-06-11 08:23:01 +0400 | [diff] [blame] | 1044 | int fd = build_open_flags(flags, mode, &op); |
| 1045 | struct filename *tmp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1046 | |
Al Viro | f9652e1 | 2013-06-11 08:23:01 +0400 | [diff] [blame] | 1047 | if (fd) |
| 1048 | return fd; |
| 1049 | |
| 1050 | tmp = getname(filename); |
| 1051 | if (IS_ERR(tmp)) |
| 1052 | return PTR_ERR(tmp); |
| 1053 | |
| 1054 | fd = get_unused_fd_flags(flags); |
| 1055 | if (fd >= 0) { |
| 1056 | struct file *f = do_filp_open(dfd, tmp, &op); |
| 1057 | if (IS_ERR(f)) { |
| 1058 | put_unused_fd(fd); |
| 1059 | fd = PTR_ERR(f); |
| 1060 | } else { |
| 1061 | fsnotify_open(f); |
| 1062 | fd_install(fd, f); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1063 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1064 | } |
Al Viro | f9652e1 | 2013-06-11 08:23:01 +0400 | [diff] [blame] | 1065 | putname(tmp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1066 | return fd; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1067 | } |
Miklos Szeredi | e922efc | 2005-09-06 15:18:25 -0700 | [diff] [blame] | 1068 | |
Al Viro | a218d0f | 2011-11-21 14:59:34 -0500 | [diff] [blame] | 1069 | SYSCALL_DEFINE3(open, const char __user *, filename, int, flags, umode_t, mode) |
Miklos Szeredi | e922efc | 2005-09-06 15:18:25 -0700 | [diff] [blame] | 1070 | { |
| 1071 | if (force_o_largefile()) |
| 1072 | flags |= O_LARGEFILE; |
| 1073 | |
Al Viro | 2cf0966 | 2013-01-21 15:25:54 -0500 | [diff] [blame] | 1074 | return do_sys_open(AT_FDCWD, filename, flags, mode); |
Miklos Szeredi | e922efc | 2005-09-06 15:18:25 -0700 | [diff] [blame] | 1075 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1076 | |
Heiko Carstens | 6559eed8 | 2009-01-14 14:14:32 +0100 | [diff] [blame] | 1077 | SYSCALL_DEFINE4(openat, int, dfd, const char __user *, filename, int, flags, |
Al Viro | a218d0f | 2011-11-21 14:59:34 -0500 | [diff] [blame] | 1078 | umode_t, mode) |
Ulrich Drepper | 5590ff0 | 2006-01-18 17:43:53 -0800 | [diff] [blame] | 1079 | { |
| 1080 | if (force_o_largefile()) |
| 1081 | flags |= O_LARGEFILE; |
| 1082 | |
Al Viro | 2cf0966 | 2013-01-21 15:25:54 -0500 | [diff] [blame] | 1083 | return do_sys_open(dfd, filename, flags, mode); |
Ulrich Drepper | 5590ff0 | 2006-01-18 17:43:53 -0800 | [diff] [blame] | 1084 | } |
Ulrich Drepper | 5590ff0 | 2006-01-18 17:43:53 -0800 | [diff] [blame] | 1085 | |
Al Viro | e35d49f | 2017-04-08 18:15:12 -0400 | [diff] [blame] | 1086 | #ifdef CONFIG_COMPAT |
| 1087 | /* |
| 1088 | * Exactly like sys_open(), except that it doesn't set the |
| 1089 | * O_LARGEFILE flag. |
| 1090 | */ |
| 1091 | COMPAT_SYSCALL_DEFINE3(open, const char __user *, filename, int, flags, umode_t, mode) |
| 1092 | { |
| 1093 | return do_sys_open(AT_FDCWD, filename, flags, mode); |
| 1094 | } |
| 1095 | |
| 1096 | /* |
| 1097 | * Exactly like sys_openat(), except that it doesn't set the |
| 1098 | * O_LARGEFILE flag. |
| 1099 | */ |
| 1100 | COMPAT_SYSCALL_DEFINE4(openat, int, dfd, const char __user *, filename, int, flags, umode_t, mode) |
| 1101 | { |
| 1102 | return do_sys_open(dfd, filename, flags, mode); |
| 1103 | } |
| 1104 | #endif |
| 1105 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1106 | #ifndef __alpha__ |
| 1107 | |
| 1108 | /* |
| 1109 | * For backward compatibility? Maybe this should be moved |
| 1110 | * into arch/i386 instead? |
| 1111 | */ |
Al Viro | a218d0f | 2011-11-21 14:59:34 -0500 | [diff] [blame] | 1112 | SYSCALL_DEFINE2(creat, const char __user *, pathname, umode_t, mode) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1113 | { |
| 1114 | return sys_open(pathname, O_CREAT | O_WRONLY | O_TRUNC, mode); |
| 1115 | } |
| 1116 | |
| 1117 | #endif |
| 1118 | |
| 1119 | /* |
| 1120 | * "id" is the POSIX thread ID. We use the |
| 1121 | * files pointer for this.. |
| 1122 | */ |
| 1123 | int filp_close(struct file *filp, fl_owner_t id) |
| 1124 | { |
Christoph Lameter | 45778ca | 2005-06-23 00:10:17 -0700 | [diff] [blame] | 1125 | int retval = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1126 | |
| 1127 | if (!file_count(filp)) { |
| 1128 | printk(KERN_ERR "VFS: Close: file count is 0\n"); |
Christoph Lameter | 45778ca | 2005-06-23 00:10:17 -0700 | [diff] [blame] | 1129 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1130 | } |
| 1131 | |
Al Viro | 72c2d53 | 2013-09-22 16:27:52 -0400 | [diff] [blame] | 1132 | if (filp->f_op->flush) |
Miklos Szeredi | 75e1fcc | 2006-06-23 02:05:12 -0700 | [diff] [blame] | 1133 | retval = filp->f_op->flush(filp, id); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1134 | |
Al Viro | 1abf0c7 | 2011-03-13 03:51:11 -0400 | [diff] [blame] | 1135 | if (likely(!(filp->f_mode & FMODE_PATH))) { |
| 1136 | dnotify_flush(filp, id); |
| 1137 | locks_remove_posix(filp, id); |
| 1138 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1139 | fput(filp); |
| 1140 | return retval; |
| 1141 | } |
| 1142 | |
| 1143 | EXPORT_SYMBOL(filp_close); |
| 1144 | |
| 1145 | /* |
| 1146 | * Careful here! We test whether the file pointer is NULL before |
| 1147 | * releasing the fd. This ensures that one clone task can't release |
| 1148 | * an fd while another clone is opening it. |
| 1149 | */ |
Heiko Carstens | ca013e9 | 2009-01-14 14:14:19 +0100 | [diff] [blame] | 1150 | SYSCALL_DEFINE1(close, unsigned int, fd) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1151 | { |
Al Viro | 483ce1d | 2012-08-19 12:04:24 -0400 | [diff] [blame] | 1152 | int retval = __close_fd(current->files, fd); |
Ernie Petrides | ee731f4 | 2006-09-29 02:00:13 -0700 | [diff] [blame] | 1153 | |
| 1154 | /* can't restart close syscall because file table entry was cleared */ |
| 1155 | if (unlikely(retval == -ERESTARTSYS || |
| 1156 | retval == -ERESTARTNOINTR || |
| 1157 | retval == -ERESTARTNOHAND || |
| 1158 | retval == -ERESTART_RESTARTBLOCK)) |
| 1159 | retval = -EINTR; |
| 1160 | |
| 1161 | return retval; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1162 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1163 | EXPORT_SYMBOL(sys_close); |
| 1164 | |
| 1165 | /* |
| 1166 | * This routine simulates a hangup on the tty, to arrange that users |
| 1167 | * are given clean terminals at login time. |
| 1168 | */ |
Heiko Carstens | ca013e9 | 2009-01-14 14:14:19 +0100 | [diff] [blame] | 1169 | SYSCALL_DEFINE0(vhangup) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1170 | { |
| 1171 | if (capable(CAP_SYS_TTY_CONFIG)) { |
Alan Cox | 2cb5998 | 2008-10-13 10:40:30 +0100 | [diff] [blame] | 1172 | tty_vhangup_self(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1173 | return 0; |
| 1174 | } |
| 1175 | return -EPERM; |
| 1176 | } |
| 1177 | |
| 1178 | /* |
| 1179 | * Called when an inode is about to be open. |
| 1180 | * We use this to disallow opening large files on 32bit systems if |
| 1181 | * the caller didn't specify O_LARGEFILE. On 64bit systems we force |
| 1182 | * on this flag in sys_open. |
| 1183 | */ |
| 1184 | int generic_file_open(struct inode * inode, struct file * filp) |
| 1185 | { |
| 1186 | 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] | 1187 | return -EOVERFLOW; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1188 | return 0; |
| 1189 | } |
| 1190 | |
| 1191 | EXPORT_SYMBOL(generic_file_open); |
| 1192 | |
| 1193 | /* |
| 1194 | * This is used by subsystems that don't want seekable |
Dmitry Torokhov | 06b1e10 | 2010-08-10 18:01:33 -0700 | [diff] [blame] | 1195 | * file descriptors. The function is not supposed to ever fail, the only |
| 1196 | * reason it returns an 'int' and not 'void' is so that it can be plugged |
| 1197 | * directly into file_operations structure. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1198 | */ |
| 1199 | int nonseekable_open(struct inode *inode, struct file *filp) |
| 1200 | { |
| 1201 | filp->f_mode &= ~(FMODE_LSEEK | FMODE_PREAD | FMODE_PWRITE); |
| 1202 | return 0; |
| 1203 | } |
| 1204 | |
| 1205 | EXPORT_SYMBOL(nonseekable_open); |