Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | File: fs/xattr.c |
| 3 | |
| 4 | Extended attribute handling. |
| 5 | |
| 6 | Copyright (C) 2001 by Andreas Gruenbacher <a.gruenbacher@computer.org> |
| 7 | Copyright (C) 2001 SGI - Silicon Graphics, Inc <linux-xfs@oss.sgi.com> |
| 8 | Copyright (c) 2004 Red Hat, Inc., James Morris <jmorris@redhat.com> |
| 9 | */ |
| 10 | #include <linux/fs.h> |
| 11 | #include <linux/slab.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 12 | #include <linux/file.h> |
| 13 | #include <linux/xattr.h> |
Dave Hansen | 18f335a | 2008-02-15 14:37:38 -0800 | [diff] [blame] | 14 | #include <linux/mount.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 15 | #include <linux/namei.h> |
| 16 | #include <linux/security.h> |
Mimi Zohar | c7b87de | 2011-03-09 14:39:18 -0500 | [diff] [blame] | 17 | #include <linux/evm.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 18 | #include <linux/syscalls.h> |
Paul Gortmaker | 630d9c4 | 2011-11-16 23:57:37 -0500 | [diff] [blame] | 19 | #include <linux/export.h> |
Robert Love | 0eeca28 | 2005-07-12 17:06:03 -0400 | [diff] [blame] | 20 | #include <linux/fsnotify.h> |
Amy Griffis | 73241cc | 2005-11-03 16:00:25 +0000 | [diff] [blame] | 21 | #include <linux/audit.h> |
Andrew Morton | 0d08d7b | 2012-04-05 14:25:07 -0700 | [diff] [blame] | 22 | #include <linux/vmalloc.h> |
Eric W. Biederman | 2f6f065 | 2012-02-07 18:52:57 -0800 | [diff] [blame] | 23 | #include <linux/posix_acl_xattr.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 24 | |
Linus Torvalds | 7c0f6ba | 2016-12-24 11:46:01 -0800 | [diff] [blame] | 25 | #include <linux/uaccess.h> |
Christoph Hellwig | 5be196e | 2006-01-09 20:51:55 -0800 | [diff] [blame] | 26 | |
Andreas Gruenbacher | b6ba117 | 2016-09-29 17:48:38 +0200 | [diff] [blame] | 27 | static const char * |
| 28 | strcmp_prefix(const char *a, const char *a_prefix) |
| 29 | { |
| 30 | while (*a_prefix && *a == *a_prefix) { |
| 31 | a++; |
| 32 | a_prefix++; |
| 33 | } |
| 34 | return *a_prefix ? NULL : a; |
| 35 | } |
| 36 | |
| 37 | /* |
| 38 | * In order to implement different sets of xattr operations for each xattr |
Andreas Gruenbacher | 6c6ef9f | 2016-09-29 17:48:44 +0200 | [diff] [blame] | 39 | * prefix, a filesystem should create a null-terminated array of struct |
| 40 | * xattr_handler (one for each prefix) and hang a pointer to it off of the |
| 41 | * s_xattr field of the superblock. |
Andreas Gruenbacher | b6ba117 | 2016-09-29 17:48:38 +0200 | [diff] [blame] | 42 | */ |
| 43 | #define for_each_xattr_handler(handlers, handler) \ |
| 44 | if (handlers) \ |
| 45 | for ((handler) = *(handlers)++; \ |
| 46 | (handler) != NULL; \ |
| 47 | (handler) = *(handlers)++) |
| 48 | |
| 49 | /* |
| 50 | * Find the xattr_handler with the matching prefix. |
| 51 | */ |
| 52 | static const struct xattr_handler * |
Andreas Gruenbacher | d0a5b99 | 2016-09-29 17:48:39 +0200 | [diff] [blame] | 53 | xattr_resolve_name(struct inode *inode, const char **name) |
Andreas Gruenbacher | b6ba117 | 2016-09-29 17:48:38 +0200 | [diff] [blame] | 54 | { |
Andreas Gruenbacher | d0a5b99 | 2016-09-29 17:48:39 +0200 | [diff] [blame] | 55 | const struct xattr_handler **handlers = inode->i_sb->s_xattr; |
Andreas Gruenbacher | b6ba117 | 2016-09-29 17:48:38 +0200 | [diff] [blame] | 56 | const struct xattr_handler *handler; |
| 57 | |
Andreas Gruenbacher | 5f6e59a | 2016-09-29 17:48:40 +0200 | [diff] [blame] | 58 | if (!(inode->i_opflags & IOP_XATTR)) { |
| 59 | if (unlikely(is_bad_inode(inode))) |
| 60 | return ERR_PTR(-EIO); |
Andreas Gruenbacher | d0a5b99 | 2016-09-29 17:48:39 +0200 | [diff] [blame] | 61 | return ERR_PTR(-EOPNOTSUPP); |
Andreas Gruenbacher | 5f6e59a | 2016-09-29 17:48:40 +0200 | [diff] [blame] | 62 | } |
Andreas Gruenbacher | b6ba117 | 2016-09-29 17:48:38 +0200 | [diff] [blame] | 63 | for_each_xattr_handler(handlers, handler) { |
| 64 | const char *n; |
| 65 | |
| 66 | n = strcmp_prefix(*name, xattr_prefix(handler)); |
| 67 | if (n) { |
| 68 | if (!handler->prefix ^ !*n) { |
| 69 | if (*n) |
| 70 | continue; |
| 71 | return ERR_PTR(-EINVAL); |
| 72 | } |
| 73 | *name = n; |
| 74 | return handler; |
| 75 | } |
| 76 | } |
| 77 | return ERR_PTR(-EOPNOTSUPP); |
| 78 | } |
| 79 | |
akpm@osdl.org | e0ad7b0 | 2006-01-09 20:51:56 -0800 | [diff] [blame] | 80 | /* |
| 81 | * Check permissions for extended attribute access. This is a bit complicated |
| 82 | * because different namespaces have very different rules. |
| 83 | */ |
| 84 | static int |
| 85 | xattr_permission(struct inode *inode, const char *name, int mask) |
| 86 | { |
| 87 | /* |
| 88 | * We can never set or remove an extended attribute on a read-only |
| 89 | * filesystem or on an immutable / append-only inode. |
| 90 | */ |
| 91 | if (mask & MAY_WRITE) { |
akpm@osdl.org | e0ad7b0 | 2006-01-09 20:51:56 -0800 | [diff] [blame] | 92 | if (IS_IMMUTABLE(inode) || IS_APPEND(inode)) |
| 93 | return -EPERM; |
Eric W. Biederman | 0bd23d09 | 2016-06-29 14:54:46 -0500 | [diff] [blame] | 94 | /* |
| 95 | * Updating an xattr will likely cause i_uid and i_gid |
| 96 | * to be writen back improperly if their true value is |
| 97 | * unknown to the vfs. |
| 98 | */ |
| 99 | if (HAS_UNMAPPED_ID(inode)) |
| 100 | return -EPERM; |
akpm@osdl.org | e0ad7b0 | 2006-01-09 20:51:56 -0800 | [diff] [blame] | 101 | } |
| 102 | |
| 103 | /* |
| 104 | * No restriction for security.* and system.* from the VFS. Decision |
| 105 | * on these is left to the underlying filesystem / security module. |
| 106 | */ |
| 107 | if (!strncmp(name, XATTR_SECURITY_PREFIX, XATTR_SECURITY_PREFIX_LEN) || |
| 108 | !strncmp(name, XATTR_SYSTEM_PREFIX, XATTR_SYSTEM_PREFIX_LEN)) |
| 109 | return 0; |
| 110 | |
| 111 | /* |
Andreas Gruenbacher | 55b23bd | 2011-05-27 14:50:36 +0200 | [diff] [blame] | 112 | * The trusted.* namespace can only be accessed by privileged users. |
akpm@osdl.org | e0ad7b0 | 2006-01-09 20:51:56 -0800 | [diff] [blame] | 113 | */ |
Andreas Gruenbacher | 55b23bd | 2011-05-27 14:50:36 +0200 | [diff] [blame] | 114 | if (!strncmp(name, XATTR_TRUSTED_PREFIX, XATTR_TRUSTED_PREFIX_LEN)) { |
| 115 | if (!capable(CAP_SYS_ADMIN)) |
| 116 | return (mask & MAY_WRITE) ? -EPERM : -ENODATA; |
| 117 | return 0; |
| 118 | } |
akpm@osdl.org | e0ad7b0 | 2006-01-09 20:51:56 -0800 | [diff] [blame] | 119 | |
Andreas Gruenbacher | 55b23bd | 2011-05-27 14:50:36 +0200 | [diff] [blame] | 120 | /* |
| 121 | * In the user.* namespace, only regular files and directories can have |
Andreas Gruenbacher | f1f2d87 | 2006-11-02 22:07:29 -0800 | [diff] [blame] | 122 | * extended attributes. For sticky directories, only the owner and |
Andreas Gruenbacher | 55b23bd | 2011-05-27 14:50:36 +0200 | [diff] [blame] | 123 | * privileged users can write attributes. |
Andreas Gruenbacher | f1f2d87 | 2006-11-02 22:07:29 -0800 | [diff] [blame] | 124 | */ |
akpm@osdl.org | e0ad7b0 | 2006-01-09 20:51:56 -0800 | [diff] [blame] | 125 | if (!strncmp(name, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN)) { |
Andreas Gruenbacher | f1f2d87 | 2006-11-02 22:07:29 -0800 | [diff] [blame] | 126 | if (!S_ISREG(inode->i_mode) && !S_ISDIR(inode->i_mode)) |
Andreas Gruenbacher | 55b23bd | 2011-05-27 14:50:36 +0200 | [diff] [blame] | 127 | return (mask & MAY_WRITE) ? -EPERM : -ENODATA; |
Andreas Gruenbacher | f1f2d87 | 2006-11-02 22:07:29 -0800 | [diff] [blame] | 128 | if (S_ISDIR(inode->i_mode) && (inode->i_mode & S_ISVTX) && |
Serge E. Hallyn | 2e14967 | 2011-03-23 16:43:26 -0700 | [diff] [blame] | 129 | (mask & MAY_WRITE) && !inode_owner_or_capable(inode)) |
akpm@osdl.org | e0ad7b0 | 2006-01-09 20:51:56 -0800 | [diff] [blame] | 130 | return -EPERM; |
| 131 | } |
| 132 | |
Daniel Rosenberg | a5a95f6 | 2018-01-23 14:34:38 -0800 | [diff] [blame] | 133 | return inode_permission2(ERR_PTR(-EOPNOTSUPP), inode, mask); |
akpm@osdl.org | e0ad7b0 | 2006-01-09 20:51:56 -0800 | [diff] [blame] | 134 | } |
| 135 | |
Andreas Gruenbacher | 5d6c319 | 2016-09-29 17:48:42 +0200 | [diff] [blame] | 136 | int |
| 137 | __vfs_setxattr(struct dentry *dentry, struct inode *inode, const char *name, |
| 138 | const void *value, size_t size, int flags) |
| 139 | { |
Andreas Gruenbacher | 6c6ef9f | 2016-09-29 17:48:44 +0200 | [diff] [blame] | 140 | const struct xattr_handler *handler; |
| 141 | |
| 142 | handler = xattr_resolve_name(inode, &name); |
| 143 | if (IS_ERR(handler)) |
| 144 | return PTR_ERR(handler); |
| 145 | if (!handler->set) |
Andreas Gruenbacher | 5d6c319 | 2016-09-29 17:48:42 +0200 | [diff] [blame] | 146 | return -EOPNOTSUPP; |
Andreas Gruenbacher | 6c6ef9f | 2016-09-29 17:48:44 +0200 | [diff] [blame] | 147 | if (size == 0) |
| 148 | value = ""; /* empty EA, do not remove */ |
| 149 | return handler->set(handler, dentry, inode, name, value, size, flags); |
Andreas Gruenbacher | 5d6c319 | 2016-09-29 17:48:42 +0200 | [diff] [blame] | 150 | } |
| 151 | EXPORT_SYMBOL(__vfs_setxattr); |
| 152 | |
David P. Quigley | b1ab7e4 | 2009-09-03 14:25:56 -0400 | [diff] [blame] | 153 | /** |
| 154 | * __vfs_setxattr_noperm - perform setxattr operation without performing |
| 155 | * permission checks. |
| 156 | * |
| 157 | * @dentry - object to perform setxattr on |
| 158 | * @name - xattr name to set |
| 159 | * @value - value to set @name to |
| 160 | * @size - size of @value |
| 161 | * @flags - flags to pass into filesystem operations |
| 162 | * |
| 163 | * returns the result of the internal setxattr or setsecurity operations. |
| 164 | * |
| 165 | * This function requires the caller to lock the inode's i_mutex before it |
| 166 | * is executed. It also assumes that the caller will make the appropriate |
| 167 | * permission checks. |
| 168 | */ |
| 169 | int __vfs_setxattr_noperm(struct dentry *dentry, const char *name, |
| 170 | const void *value, size_t size, int flags) |
Christoph Hellwig | 5be196e | 2006-01-09 20:51:55 -0800 | [diff] [blame] | 171 | { |
| 172 | struct inode *inode = dentry->d_inode; |
Andreas Gruenbacher | 4a59015 | 2016-11-13 21:23:34 +0100 | [diff] [blame] | 173 | int error = -EAGAIN; |
Andi Kleen | 69b4573 | 2011-05-28 08:25:51 -0700 | [diff] [blame] | 174 | int issec = !strncmp(name, XATTR_SECURITY_PREFIX, |
| 175 | XATTR_SECURITY_PREFIX_LEN); |
Christoph Hellwig | 5be196e | 2006-01-09 20:51:55 -0800 | [diff] [blame] | 176 | |
Andi Kleen | 69b4573 | 2011-05-28 08:25:51 -0700 | [diff] [blame] | 177 | if (issec) |
| 178 | inode->i_flags &= ~S_NOSEC; |
Andreas Gruenbacher | 6c6ef9f | 2016-09-29 17:48:44 +0200 | [diff] [blame] | 179 | if (inode->i_opflags & IOP_XATTR) { |
Andreas Gruenbacher | 5d6c319 | 2016-09-29 17:48:42 +0200 | [diff] [blame] | 180 | error = __vfs_setxattr(dentry, inode, name, value, size, flags); |
Christoph Hellwig | 5be196e | 2006-01-09 20:51:55 -0800 | [diff] [blame] | 181 | if (!error) { |
| 182 | fsnotify_xattr(dentry); |
| 183 | security_inode_post_setxattr(dentry, name, value, |
| 184 | size, flags); |
| 185 | } |
Andreas Gruenbacher | 4a59015 | 2016-11-13 21:23:34 +0100 | [diff] [blame] | 186 | } else { |
Andreas Gruenbacher | 5f6e59a | 2016-09-29 17:48:40 +0200 | [diff] [blame] | 187 | if (unlikely(is_bad_inode(inode))) |
| 188 | return -EIO; |
Andreas Gruenbacher | 4a59015 | 2016-11-13 21:23:34 +0100 | [diff] [blame] | 189 | } |
| 190 | if (error == -EAGAIN) { |
| 191 | error = -EOPNOTSUPP; |
| 192 | |
| 193 | if (issec) { |
| 194 | const char *suffix = name + XATTR_SECURITY_PREFIX_LEN; |
| 195 | |
| 196 | error = security_inode_setsecurity(inode, suffix, value, |
| 197 | size, flags); |
| 198 | if (!error) |
| 199 | fsnotify_xattr(dentry); |
| 200 | } |
Christoph Hellwig | 5be196e | 2006-01-09 20:51:55 -0800 | [diff] [blame] | 201 | } |
David P. Quigley | b1ab7e4 | 2009-09-03 14:25:56 -0400 | [diff] [blame] | 202 | |
| 203 | return error; |
| 204 | } |
| 205 | |
| 206 | |
| 207 | int |
| 208 | vfs_setxattr(struct dentry *dentry, const char *name, const void *value, |
| 209 | size_t size, int flags) |
| 210 | { |
| 211 | struct inode *inode = dentry->d_inode; |
| 212 | int error; |
| 213 | |
| 214 | error = xattr_permission(inode, name, MAY_WRITE); |
| 215 | if (error) |
| 216 | return error; |
| 217 | |
Al Viro | 5955102 | 2016-01-22 15:40:57 -0500 | [diff] [blame] | 218 | inode_lock(inode); |
David P. Quigley | b1ab7e4 | 2009-09-03 14:25:56 -0400 | [diff] [blame] | 219 | error = security_inode_setxattr(dentry, name, value, size, flags); |
| 220 | if (error) |
| 221 | goto out; |
| 222 | |
| 223 | error = __vfs_setxattr_noperm(dentry, name, value, size, flags); |
| 224 | |
Christoph Hellwig | 5be196e | 2006-01-09 20:51:55 -0800 | [diff] [blame] | 225 | out: |
Al Viro | 5955102 | 2016-01-22 15:40:57 -0500 | [diff] [blame] | 226 | inode_unlock(inode); |
Christoph Hellwig | 5be196e | 2006-01-09 20:51:55 -0800 | [diff] [blame] | 227 | return error; |
| 228 | } |
| 229 | EXPORT_SYMBOL_GPL(vfs_setxattr); |
| 230 | |
Al Viro | 2220c5b | 2018-04-24 21:22:04 -0400 | [diff] [blame] | 231 | static ssize_t |
David P. Quigley | 4249259 | 2008-02-04 22:29:39 -0800 | [diff] [blame] | 232 | xattr_getsecurity(struct inode *inode, const char *name, void *value, |
| 233 | size_t size) |
| 234 | { |
| 235 | void *buffer = NULL; |
| 236 | ssize_t len; |
| 237 | |
| 238 | if (!value || !size) { |
| 239 | len = security_inode_getsecurity(inode, name, &buffer, false); |
| 240 | goto out_noalloc; |
| 241 | } |
| 242 | |
| 243 | len = security_inode_getsecurity(inode, name, &buffer, true); |
| 244 | if (len < 0) |
| 245 | return len; |
| 246 | if (size < len) { |
| 247 | len = -ERANGE; |
| 248 | goto out; |
| 249 | } |
| 250 | memcpy(value, buffer, len); |
| 251 | out: |
Casey Schaufler | 57e7ba0 | 2017-09-19 09:39:08 -0700 | [diff] [blame] | 252 | kfree(buffer); |
David P. Quigley | 4249259 | 2008-02-04 22:29:39 -0800 | [diff] [blame] | 253 | out_noalloc: |
| 254 | return len; |
| 255 | } |
David P. Quigley | 4249259 | 2008-02-04 22:29:39 -0800 | [diff] [blame] | 256 | |
Mimi Zohar | 1601fba | 2011-03-09 14:23:34 -0500 | [diff] [blame] | 257 | /* |
| 258 | * vfs_getxattr_alloc - allocate memory, if necessary, before calling getxattr |
| 259 | * |
| 260 | * Allocate memory, if not already allocated, or re-allocate correct size, |
| 261 | * before retrieving the extended attribute. |
| 262 | * |
| 263 | * Returns the result of alloc, if failed, or the getxattr operation. |
| 264 | */ |
| 265 | ssize_t |
| 266 | vfs_getxattr_alloc(struct dentry *dentry, const char *name, char **xattr_value, |
| 267 | size_t xattr_size, gfp_t flags) |
| 268 | { |
Andreas Gruenbacher | 6c6ef9f | 2016-09-29 17:48:44 +0200 | [diff] [blame] | 269 | const struct xattr_handler *handler; |
Mimi Zohar | 1601fba | 2011-03-09 14:23:34 -0500 | [diff] [blame] | 270 | struct inode *inode = dentry->d_inode; |
| 271 | char *value = *xattr_value; |
| 272 | int error; |
| 273 | |
| 274 | error = xattr_permission(inode, name, MAY_READ); |
| 275 | if (error) |
| 276 | return error; |
| 277 | |
Andreas Gruenbacher | 6c6ef9f | 2016-09-29 17:48:44 +0200 | [diff] [blame] | 278 | handler = xattr_resolve_name(inode, &name); |
| 279 | if (IS_ERR(handler)) |
| 280 | return PTR_ERR(handler); |
| 281 | if (!handler->get) |
Mimi Zohar | 1601fba | 2011-03-09 14:23:34 -0500 | [diff] [blame] | 282 | return -EOPNOTSUPP; |
Andreas Gruenbacher | 6c6ef9f | 2016-09-29 17:48:44 +0200 | [diff] [blame] | 283 | error = handler->get(handler, dentry, inode, name, NULL, 0); |
Mimi Zohar | 1601fba | 2011-03-09 14:23:34 -0500 | [diff] [blame] | 284 | if (error < 0) |
| 285 | return error; |
| 286 | |
| 287 | if (!value || (error > xattr_size)) { |
| 288 | value = krealloc(*xattr_value, error + 1, flags); |
| 289 | if (!value) |
| 290 | return -ENOMEM; |
| 291 | memset(value, 0, error + 1); |
| 292 | } |
| 293 | |
Andreas Gruenbacher | 6c6ef9f | 2016-09-29 17:48:44 +0200 | [diff] [blame] | 294 | error = handler->get(handler, dentry, inode, name, value, error); |
Mimi Zohar | 1601fba | 2011-03-09 14:23:34 -0500 | [diff] [blame] | 295 | *xattr_value = value; |
| 296 | return error; |
| 297 | } |
| 298 | |
David P. Quigley | 4249259 | 2008-02-04 22:29:39 -0800 | [diff] [blame] | 299 | ssize_t |
Andreas Gruenbacher | 5d6c319 | 2016-09-29 17:48:42 +0200 | [diff] [blame] | 300 | __vfs_getxattr(struct dentry *dentry, struct inode *inode, const char *name, |
| 301 | void *value, size_t size) |
| 302 | { |
Andreas Gruenbacher | 6c6ef9f | 2016-09-29 17:48:44 +0200 | [diff] [blame] | 303 | const struct xattr_handler *handler; |
| 304 | |
| 305 | handler = xattr_resolve_name(inode, &name); |
| 306 | if (IS_ERR(handler)) |
| 307 | return PTR_ERR(handler); |
Mark Salyzyn | 8cca945 | 2019-07-15 15:35:13 -0700 | [diff] [blame] | 308 | if (unlikely(handler->__get)) |
| 309 | return handler->__get(handler, dentry, inode, name, value, |
| 310 | size); |
Andreas Gruenbacher | 6c6ef9f | 2016-09-29 17:48:44 +0200 | [diff] [blame] | 311 | if (!handler->get) |
Andreas Gruenbacher | 5d6c319 | 2016-09-29 17:48:42 +0200 | [diff] [blame] | 312 | return -EOPNOTSUPP; |
Andreas Gruenbacher | 6c6ef9f | 2016-09-29 17:48:44 +0200 | [diff] [blame] | 313 | return handler->get(handler, dentry, inode, name, value, size); |
Andreas Gruenbacher | 5d6c319 | 2016-09-29 17:48:42 +0200 | [diff] [blame] | 314 | } |
| 315 | EXPORT_SYMBOL(__vfs_getxattr); |
| 316 | |
| 317 | ssize_t |
David Howells | 8f0cfa5 | 2008-04-29 00:59:41 -0700 | [diff] [blame] | 318 | vfs_getxattr(struct dentry *dentry, const char *name, void *value, size_t size) |
Christoph Hellwig | 5be196e | 2006-01-09 20:51:55 -0800 | [diff] [blame] | 319 | { |
| 320 | struct inode *inode = dentry->d_inode; |
| 321 | int error; |
Mark Salyzyn | 8cca945 | 2019-07-15 15:35:13 -0700 | [diff] [blame] | 322 | const struct xattr_handler *handler; |
Christoph Hellwig | 5be196e | 2006-01-09 20:51:55 -0800 | [diff] [blame] | 323 | |
akpm@osdl.org | e0ad7b0 | 2006-01-09 20:51:56 -0800 | [diff] [blame] | 324 | error = xattr_permission(inode, name, MAY_READ); |
| 325 | if (error) |
| 326 | return error; |
| 327 | |
Christoph Hellwig | 5be196e | 2006-01-09 20:51:55 -0800 | [diff] [blame] | 328 | error = security_inode_getxattr(dentry, name); |
| 329 | if (error) |
| 330 | return error; |
| 331 | |
Christoph Hellwig | 5be196e | 2006-01-09 20:51:55 -0800 | [diff] [blame] | 332 | if (!strncmp(name, XATTR_SECURITY_PREFIX, |
akpm@osdl.org | e0ad7b0 | 2006-01-09 20:51:56 -0800 | [diff] [blame] | 333 | XATTR_SECURITY_PREFIX_LEN)) { |
| 334 | const char *suffix = name + XATTR_SECURITY_PREFIX_LEN; |
David P. Quigley | 4249259 | 2008-02-04 22:29:39 -0800 | [diff] [blame] | 335 | int ret = xattr_getsecurity(inode, suffix, value, size); |
Christoph Hellwig | 5be196e | 2006-01-09 20:51:55 -0800 | [diff] [blame] | 336 | /* |
| 337 | * Only overwrite the return value if a security module |
| 338 | * is actually active. |
| 339 | */ |
David P. Quigley | 4bea580 | 2008-02-04 22:29:40 -0800 | [diff] [blame] | 340 | if (ret == -EOPNOTSUPP) |
| 341 | goto nolsm; |
| 342 | return ret; |
Christoph Hellwig | 5be196e | 2006-01-09 20:51:55 -0800 | [diff] [blame] | 343 | } |
David P. Quigley | 4bea580 | 2008-02-04 22:29:40 -0800 | [diff] [blame] | 344 | nolsm: |
Mark Salyzyn | 8cca945 | 2019-07-15 15:35:13 -0700 | [diff] [blame] | 345 | handler = xattr_resolve_name(inode, &name); |
| 346 | if (IS_ERR(handler)) |
| 347 | return PTR_ERR(handler); |
| 348 | if (!handler->get) |
| 349 | return -EOPNOTSUPP; |
| 350 | return handler->get(handler, dentry, inode, name, value, size); |
Christoph Hellwig | 5be196e | 2006-01-09 20:51:55 -0800 | [diff] [blame] | 351 | } |
| 352 | EXPORT_SYMBOL_GPL(vfs_getxattr); |
| 353 | |
Bill Nottingham | 659564c | 2006-10-09 16:10:48 -0400 | [diff] [blame] | 354 | ssize_t |
Andreas Gruenbacher | bf3ee71 | 2016-09-29 17:48:43 +0200 | [diff] [blame] | 355 | vfs_listxattr(struct dentry *dentry, char *list, size_t size) |
Bill Nottingham | 659564c | 2006-10-09 16:10:48 -0400 | [diff] [blame] | 356 | { |
Andreas Gruenbacher | bf3ee71 | 2016-09-29 17:48:43 +0200 | [diff] [blame] | 357 | struct inode *inode = d_inode(dentry); |
Bill Nottingham | 659564c | 2006-10-09 16:10:48 -0400 | [diff] [blame] | 358 | ssize_t error; |
| 359 | |
Andreas Gruenbacher | bf3ee71 | 2016-09-29 17:48:43 +0200 | [diff] [blame] | 360 | error = security_inode_listxattr(dentry); |
Bill Nottingham | 659564c | 2006-10-09 16:10:48 -0400 | [diff] [blame] | 361 | if (error) |
| 362 | return error; |
Andreas Gruenbacher | bf3ee71 | 2016-09-29 17:48:43 +0200 | [diff] [blame] | 363 | if (inode->i_op->listxattr && (inode->i_opflags & IOP_XATTR)) { |
Andreas Gruenbacher | bf3ee71 | 2016-09-29 17:48:43 +0200 | [diff] [blame] | 364 | error = inode->i_op->listxattr(dentry, list, size); |
Bill Nottingham | 659564c | 2006-10-09 16:10:48 -0400 | [diff] [blame] | 365 | } else { |
Andreas Gruenbacher | bf3ee71 | 2016-09-29 17:48:43 +0200 | [diff] [blame] | 366 | error = security_inode_listsecurity(inode, list, size); |
Bill Nottingham | 659564c | 2006-10-09 16:10:48 -0400 | [diff] [blame] | 367 | if (size && error > size) |
| 368 | error = -ERANGE; |
| 369 | } |
| 370 | return error; |
| 371 | } |
| 372 | EXPORT_SYMBOL_GPL(vfs_listxattr); |
| 373 | |
Christoph Hellwig | 5be196e | 2006-01-09 20:51:55 -0800 | [diff] [blame] | 374 | int |
Andreas Gruenbacher | 5d6c319 | 2016-09-29 17:48:42 +0200 | [diff] [blame] | 375 | __vfs_removexattr(struct dentry *dentry, const char *name) |
| 376 | { |
Andreas Gruenbacher | 6c6ef9f | 2016-09-29 17:48:44 +0200 | [diff] [blame] | 377 | struct inode *inode = d_inode(dentry); |
| 378 | const struct xattr_handler *handler; |
Andreas Gruenbacher | 5d6c319 | 2016-09-29 17:48:42 +0200 | [diff] [blame] | 379 | |
Andreas Gruenbacher | 6c6ef9f | 2016-09-29 17:48:44 +0200 | [diff] [blame] | 380 | handler = xattr_resolve_name(inode, &name); |
| 381 | if (IS_ERR(handler)) |
| 382 | return PTR_ERR(handler); |
| 383 | if (!handler->set) |
Andreas Gruenbacher | 5d6c319 | 2016-09-29 17:48:42 +0200 | [diff] [blame] | 384 | return -EOPNOTSUPP; |
Andreas Gruenbacher | 6c6ef9f | 2016-09-29 17:48:44 +0200 | [diff] [blame] | 385 | return handler->set(handler, dentry, inode, name, NULL, 0, XATTR_REPLACE); |
Andreas Gruenbacher | 5d6c319 | 2016-09-29 17:48:42 +0200 | [diff] [blame] | 386 | } |
| 387 | EXPORT_SYMBOL(__vfs_removexattr); |
| 388 | |
| 389 | int |
David Howells | 8f0cfa5 | 2008-04-29 00:59:41 -0700 | [diff] [blame] | 390 | vfs_removexattr(struct dentry *dentry, const char *name) |
Christoph Hellwig | 5be196e | 2006-01-09 20:51:55 -0800 | [diff] [blame] | 391 | { |
| 392 | struct inode *inode = dentry->d_inode; |
| 393 | int error; |
| 394 | |
akpm@osdl.org | e0ad7b0 | 2006-01-09 20:51:56 -0800 | [diff] [blame] | 395 | error = xattr_permission(inode, name, MAY_WRITE); |
| 396 | if (error) |
| 397 | return error; |
| 398 | |
Al Viro | 5955102 | 2016-01-22 15:40:57 -0500 | [diff] [blame] | 399 | inode_lock(inode); |
Mimi Zohar | 2ab51f3 | 2011-03-23 17:23:06 -0400 | [diff] [blame] | 400 | error = security_inode_removexattr(dentry, name); |
Dmitry Kasatkin | 7c51bb00 | 2014-11-20 16:31:01 +0200 | [diff] [blame] | 401 | if (error) |
| 402 | goto out; |
Mimi Zohar | 2ab51f3 | 2011-03-23 17:23:06 -0400 | [diff] [blame] | 403 | |
Andreas Gruenbacher | 5d6c319 | 2016-09-29 17:48:42 +0200 | [diff] [blame] | 404 | error = __vfs_removexattr(dentry, name); |
Christoph Hellwig | 5be196e | 2006-01-09 20:51:55 -0800 | [diff] [blame] | 405 | |
Mimi Zohar | c7b87de | 2011-03-09 14:39:18 -0500 | [diff] [blame] | 406 | if (!error) { |
Christoph Hellwig | 5be196e | 2006-01-09 20:51:55 -0800 | [diff] [blame] | 407 | fsnotify_xattr(dentry); |
Mimi Zohar | c7b87de | 2011-03-09 14:39:18 -0500 | [diff] [blame] | 408 | evm_inode_post_removexattr(dentry, name); |
| 409 | } |
Dmitry Kasatkin | 7c51bb00 | 2014-11-20 16:31:01 +0200 | [diff] [blame] | 410 | |
| 411 | out: |
Al Viro | 5955102 | 2016-01-22 15:40:57 -0500 | [diff] [blame] | 412 | inode_unlock(inode); |
Christoph Hellwig | 5be196e | 2006-01-09 20:51:55 -0800 | [diff] [blame] | 413 | return error; |
| 414 | } |
| 415 | EXPORT_SYMBOL_GPL(vfs_removexattr); |
| 416 | |
| 417 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 418 | /* |
| 419 | * Extended attribute SET operations |
| 420 | */ |
| 421 | static long |
David Howells | 8f0cfa5 | 2008-04-29 00:59:41 -0700 | [diff] [blame] | 422 | setxattr(struct dentry *d, const char __user *name, const void __user *value, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 423 | size_t size, int flags) |
| 424 | { |
| 425 | int error; |
| 426 | void *kvalue = NULL; |
| 427 | char kname[XATTR_NAME_MAX + 1]; |
| 428 | |
| 429 | if (flags & ~(XATTR_CREATE|XATTR_REPLACE)) |
| 430 | return -EINVAL; |
| 431 | |
| 432 | error = strncpy_from_user(kname, name, sizeof(kname)); |
| 433 | if (error == 0 || error == sizeof(kname)) |
| 434 | error = -ERANGE; |
| 435 | if (error < 0) |
| 436 | return error; |
| 437 | |
| 438 | if (size) { |
| 439 | if (size > XATTR_SIZE_MAX) |
| 440 | return -E2BIG; |
Michal Hocko | 752ade6 | 2017-05-08 15:57:27 -0700 | [diff] [blame] | 441 | kvalue = kvmalloc(size, GFP_KERNEL); |
| 442 | if (!kvalue) |
| 443 | return -ENOMEM; |
Andrew Morton | 44c8249 | 2012-04-05 14:25:07 -0700 | [diff] [blame] | 444 | if (copy_from_user(kvalue, value, size)) { |
| 445 | error = -EFAULT; |
| 446 | goto out; |
| 447 | } |
Eric W. Biederman | 2f6f065 | 2012-02-07 18:52:57 -0800 | [diff] [blame] | 448 | if ((strcmp(kname, XATTR_NAME_POSIX_ACL_ACCESS) == 0) || |
| 449 | (strcmp(kname, XATTR_NAME_POSIX_ACL_DEFAULT) == 0)) |
| 450 | posix_acl_fix_xattr_from_user(kvalue, size); |
Serge E. Hallyn | 8db6c34 | 2017-05-08 13:11:56 -0500 | [diff] [blame] | 451 | else if (strcmp(kname, XATTR_NAME_CAPS) == 0) { |
| 452 | error = cap_convert_nscap(d, &kvalue, size); |
| 453 | if (error < 0) |
| 454 | goto out; |
| 455 | size = error; |
| 456 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 457 | } |
| 458 | |
Christoph Hellwig | 5be196e | 2006-01-09 20:51:55 -0800 | [diff] [blame] | 459 | error = vfs_setxattr(d, kname, kvalue, size, flags); |
Andrew Morton | 44c8249 | 2012-04-05 14:25:07 -0700 | [diff] [blame] | 460 | out: |
Richard Weinberger | 0b2a6f2 | 2016-01-02 23:09:47 +0100 | [diff] [blame] | 461 | kvfree(kvalue); |
| 462 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 463 | return error; |
| 464 | } |
| 465 | |
Eric Biggers | 8cc4311 | 2014-10-12 11:59:58 -0500 | [diff] [blame] | 466 | static int path_setxattr(const char __user *pathname, |
| 467 | const char __user *name, const void __user *value, |
| 468 | size_t size, int flags, unsigned int lookup_flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 469 | { |
Al Viro | 2d8f303 | 2008-07-22 09:59:21 -0400 | [diff] [blame] | 470 | struct path path; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 471 | int error; |
Jeff Layton | 68f1bb8 | 2012-12-11 12:10:15 -0500 | [diff] [blame] | 472 | retry: |
| 473 | error = user_path_at(AT_FDCWD, pathname, lookup_flags, &path); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 474 | if (error) |
| 475 | return error; |
Al Viro | 2d8f303 | 2008-07-22 09:59:21 -0400 | [diff] [blame] | 476 | error = mnt_want_write(path.mnt); |
Dave Hansen | 18f335a | 2008-02-15 14:37:38 -0800 | [diff] [blame] | 477 | if (!error) { |
Al Viro | 2d8f303 | 2008-07-22 09:59:21 -0400 | [diff] [blame] | 478 | error = setxattr(path.dentry, name, value, size, flags); |
| 479 | mnt_drop_write(path.mnt); |
Dave Hansen | 18f335a | 2008-02-15 14:37:38 -0800 | [diff] [blame] | 480 | } |
Al Viro | 2d8f303 | 2008-07-22 09:59:21 -0400 | [diff] [blame] | 481 | path_put(&path); |
Jeff Layton | 68f1bb8 | 2012-12-11 12:10:15 -0500 | [diff] [blame] | 482 | if (retry_estale(error, lookup_flags)) { |
| 483 | lookup_flags |= LOOKUP_REVAL; |
| 484 | goto retry; |
| 485 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 486 | return error; |
| 487 | } |
| 488 | |
Eric Biggers | 8cc4311 | 2014-10-12 11:59:58 -0500 | [diff] [blame] | 489 | SYSCALL_DEFINE5(setxattr, const char __user *, pathname, |
| 490 | const char __user *, name, const void __user *, value, |
| 491 | size_t, size, int, flags) |
| 492 | { |
| 493 | return path_setxattr(pathname, name, value, size, flags, LOOKUP_FOLLOW); |
| 494 | } |
| 495 | |
Heiko Carstens | 64fd1de | 2009-01-14 14:14:14 +0100 | [diff] [blame] | 496 | SYSCALL_DEFINE5(lsetxattr, const char __user *, pathname, |
| 497 | const char __user *, name, const void __user *, value, |
| 498 | size_t, size, int, flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 499 | { |
Eric Biggers | 8cc4311 | 2014-10-12 11:59:58 -0500 | [diff] [blame] | 500 | return path_setxattr(pathname, name, value, size, flags, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 501 | } |
| 502 | |
Heiko Carstens | 64fd1de | 2009-01-14 14:14:14 +0100 | [diff] [blame] | 503 | SYSCALL_DEFINE5(fsetxattr, int, fd, const char __user *, name, |
| 504 | const void __user *,value, size_t, size, int, flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 505 | { |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 506 | struct fd f = fdget(fd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 507 | int error = -EBADF; |
| 508 | |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 509 | if (!f.file) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 510 | return error; |
Al Viro | 9f45f5b | 2014-10-31 17:44:57 -0400 | [diff] [blame] | 511 | audit_file(f.file); |
Miklos Szeredi | 6742cee | 2018-07-18 15:44:43 +0200 | [diff] [blame] | 512 | error = mnt_want_write_file(f.file); |
Dave Hansen | 18f335a | 2008-02-15 14:37:38 -0800 | [diff] [blame] | 513 | if (!error) { |
Al Viro | 9f45f5b | 2014-10-31 17:44:57 -0400 | [diff] [blame] | 514 | error = setxattr(f.file->f_path.dentry, name, value, size, flags); |
Miklos Szeredi | 6742cee | 2018-07-18 15:44:43 +0200 | [diff] [blame] | 515 | mnt_drop_write_file(f.file); |
Dave Hansen | 18f335a | 2008-02-15 14:37:38 -0800 | [diff] [blame] | 516 | } |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 517 | fdput(f); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 518 | return error; |
| 519 | } |
| 520 | |
| 521 | /* |
| 522 | * Extended attribute GET operations |
| 523 | */ |
| 524 | static ssize_t |
David Howells | 8f0cfa5 | 2008-04-29 00:59:41 -0700 | [diff] [blame] | 525 | getxattr(struct dentry *d, const char __user *name, void __user *value, |
| 526 | size_t size) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 527 | { |
| 528 | ssize_t error; |
| 529 | void *kvalue = NULL; |
| 530 | char kname[XATTR_NAME_MAX + 1]; |
| 531 | |
| 532 | error = strncpy_from_user(kname, name, sizeof(kname)); |
| 533 | if (error == 0 || error == sizeof(kname)) |
| 534 | error = -ERANGE; |
| 535 | if (error < 0) |
| 536 | return error; |
| 537 | |
| 538 | if (size) { |
| 539 | if (size > XATTR_SIZE_MAX) |
| 540 | size = XATTR_SIZE_MAX; |
Michal Hocko | 752ade6 | 2017-05-08 15:57:27 -0700 | [diff] [blame] | 541 | kvalue = kvzalloc(size, GFP_KERNEL); |
| 542 | if (!kvalue) |
| 543 | return -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 544 | } |
| 545 | |
Christoph Hellwig | 5be196e | 2006-01-09 20:51:55 -0800 | [diff] [blame] | 546 | error = vfs_getxattr(d, kname, kvalue, size); |
Stephen Smalley | f549d6c | 2005-09-03 15:55:18 -0700 | [diff] [blame] | 547 | if (error > 0) { |
Eric W. Biederman | 2f6f065 | 2012-02-07 18:52:57 -0800 | [diff] [blame] | 548 | if ((strcmp(kname, XATTR_NAME_POSIX_ACL_ACCESS) == 0) || |
| 549 | (strcmp(kname, XATTR_NAME_POSIX_ACL_DEFAULT) == 0)) |
Christian Brauner | 82c9a92 | 2018-06-07 13:43:48 +0200 | [diff] [blame] | 550 | posix_acl_fix_xattr_to_user(kvalue, error); |
Stephen Smalley | f549d6c | 2005-09-03 15:55:18 -0700 | [diff] [blame] | 551 | if (size && copy_to_user(value, kvalue, error)) |
| 552 | error = -EFAULT; |
| 553 | } else if (error == -ERANGE && size >= XATTR_SIZE_MAX) { |
| 554 | /* The file system tried to returned a value bigger |
| 555 | than XATTR_SIZE_MAX bytes. Not possible. */ |
| 556 | error = -E2BIG; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 557 | } |
Richard Weinberger | 0b2a6f2 | 2016-01-02 23:09:47 +0100 | [diff] [blame] | 558 | |
| 559 | kvfree(kvalue); |
| 560 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 561 | return error; |
| 562 | } |
| 563 | |
Eric Biggers | 8cc4311 | 2014-10-12 11:59:58 -0500 | [diff] [blame] | 564 | static ssize_t path_getxattr(const char __user *pathname, |
| 565 | const char __user *name, void __user *value, |
| 566 | size_t size, unsigned int lookup_flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 567 | { |
Al Viro | 2d8f303 | 2008-07-22 09:59:21 -0400 | [diff] [blame] | 568 | struct path path; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 569 | ssize_t error; |
Jeff Layton | 60e66b4 | 2012-12-11 12:10:16 -0500 | [diff] [blame] | 570 | retry: |
| 571 | error = user_path_at(AT_FDCWD, pathname, lookup_flags, &path); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 572 | if (error) |
| 573 | return error; |
Al Viro | 2d8f303 | 2008-07-22 09:59:21 -0400 | [diff] [blame] | 574 | error = getxattr(path.dentry, name, value, size); |
| 575 | path_put(&path); |
Jeff Layton | 60e66b4 | 2012-12-11 12:10:16 -0500 | [diff] [blame] | 576 | if (retry_estale(error, lookup_flags)) { |
| 577 | lookup_flags |= LOOKUP_REVAL; |
| 578 | goto retry; |
| 579 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 580 | return error; |
| 581 | } |
| 582 | |
Eric Biggers | 8cc4311 | 2014-10-12 11:59:58 -0500 | [diff] [blame] | 583 | SYSCALL_DEFINE4(getxattr, const char __user *, pathname, |
| 584 | const char __user *, name, void __user *, value, size_t, size) |
| 585 | { |
| 586 | return path_getxattr(pathname, name, value, size, LOOKUP_FOLLOW); |
| 587 | } |
| 588 | |
Heiko Carstens | 64fd1de | 2009-01-14 14:14:14 +0100 | [diff] [blame] | 589 | SYSCALL_DEFINE4(lgetxattr, const char __user *, pathname, |
| 590 | const char __user *, name, void __user *, value, size_t, size) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 591 | { |
Eric Biggers | 8cc4311 | 2014-10-12 11:59:58 -0500 | [diff] [blame] | 592 | return path_getxattr(pathname, name, value, size, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 593 | } |
| 594 | |
Heiko Carstens | 64fd1de | 2009-01-14 14:14:14 +0100 | [diff] [blame] | 595 | SYSCALL_DEFINE4(fgetxattr, int, fd, const char __user *, name, |
| 596 | void __user *, value, size_t, size) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 597 | { |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 598 | struct fd f = fdget(fd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 599 | ssize_t error = -EBADF; |
| 600 | |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 601 | if (!f.file) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 602 | return error; |
Al Viro | 9f45f5b | 2014-10-31 17:44:57 -0400 | [diff] [blame] | 603 | audit_file(f.file); |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 604 | error = getxattr(f.file->f_path.dentry, name, value, size); |
| 605 | fdput(f); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 606 | return error; |
| 607 | } |
| 608 | |
| 609 | /* |
| 610 | * Extended attribute LIST operations |
| 611 | */ |
| 612 | static ssize_t |
| 613 | listxattr(struct dentry *d, char __user *list, size_t size) |
| 614 | { |
| 615 | ssize_t error; |
| 616 | char *klist = NULL; |
| 617 | |
| 618 | if (size) { |
| 619 | if (size > XATTR_LIST_MAX) |
| 620 | size = XATTR_LIST_MAX; |
Michal Hocko | 752ade6 | 2017-05-08 15:57:27 -0700 | [diff] [blame] | 621 | klist = kvmalloc(size, GFP_KERNEL); |
| 622 | if (!klist) |
| 623 | return -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 624 | } |
| 625 | |
Bill Nottingham | 659564c | 2006-10-09 16:10:48 -0400 | [diff] [blame] | 626 | error = vfs_listxattr(d, klist, size); |
Stephen Smalley | f549d6c | 2005-09-03 15:55:18 -0700 | [diff] [blame] | 627 | if (error > 0) { |
| 628 | if (size && copy_to_user(list, klist, error)) |
| 629 | error = -EFAULT; |
| 630 | } else if (error == -ERANGE && size >= XATTR_LIST_MAX) { |
| 631 | /* The file system tried to returned a list bigger |
| 632 | than XATTR_LIST_MAX bytes. Not possible. */ |
| 633 | error = -E2BIG; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 634 | } |
Richard Weinberger | 0b2a6f2 | 2016-01-02 23:09:47 +0100 | [diff] [blame] | 635 | |
| 636 | kvfree(klist); |
| 637 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 638 | return error; |
| 639 | } |
| 640 | |
Eric Biggers | 8cc4311 | 2014-10-12 11:59:58 -0500 | [diff] [blame] | 641 | static ssize_t path_listxattr(const char __user *pathname, char __user *list, |
| 642 | size_t size, unsigned int lookup_flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 643 | { |
Al Viro | 2d8f303 | 2008-07-22 09:59:21 -0400 | [diff] [blame] | 644 | struct path path; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 645 | ssize_t error; |
Jeff Layton | 10a90cf | 2012-12-11 12:10:16 -0500 | [diff] [blame] | 646 | retry: |
| 647 | error = user_path_at(AT_FDCWD, pathname, lookup_flags, &path); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 648 | if (error) |
| 649 | return error; |
Al Viro | 2d8f303 | 2008-07-22 09:59:21 -0400 | [diff] [blame] | 650 | error = listxattr(path.dentry, list, size); |
| 651 | path_put(&path); |
Jeff Layton | 10a90cf | 2012-12-11 12:10:16 -0500 | [diff] [blame] | 652 | if (retry_estale(error, lookup_flags)) { |
| 653 | lookup_flags |= LOOKUP_REVAL; |
| 654 | goto retry; |
| 655 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 656 | return error; |
| 657 | } |
| 658 | |
Eric Biggers | 8cc4311 | 2014-10-12 11:59:58 -0500 | [diff] [blame] | 659 | SYSCALL_DEFINE3(listxattr, const char __user *, pathname, char __user *, list, |
| 660 | size_t, size) |
| 661 | { |
| 662 | return path_listxattr(pathname, list, size, LOOKUP_FOLLOW); |
| 663 | } |
| 664 | |
Heiko Carstens | 64fd1de | 2009-01-14 14:14:14 +0100 | [diff] [blame] | 665 | SYSCALL_DEFINE3(llistxattr, const char __user *, pathname, char __user *, list, |
| 666 | size_t, size) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 667 | { |
Eric Biggers | 8cc4311 | 2014-10-12 11:59:58 -0500 | [diff] [blame] | 668 | return path_listxattr(pathname, list, size, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 669 | } |
| 670 | |
Heiko Carstens | 64fd1de | 2009-01-14 14:14:14 +0100 | [diff] [blame] | 671 | SYSCALL_DEFINE3(flistxattr, int, fd, char __user *, list, size_t, size) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 672 | { |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 673 | struct fd f = fdget(fd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 674 | ssize_t error = -EBADF; |
| 675 | |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 676 | if (!f.file) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 677 | return error; |
Al Viro | 9f45f5b | 2014-10-31 17:44:57 -0400 | [diff] [blame] | 678 | audit_file(f.file); |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 679 | error = listxattr(f.file->f_path.dentry, list, size); |
| 680 | fdput(f); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 681 | return error; |
| 682 | } |
| 683 | |
| 684 | /* |
| 685 | * Extended attribute REMOVE operations |
| 686 | */ |
| 687 | static long |
David Howells | 8f0cfa5 | 2008-04-29 00:59:41 -0700 | [diff] [blame] | 688 | removexattr(struct dentry *d, const char __user *name) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 689 | { |
| 690 | int error; |
| 691 | char kname[XATTR_NAME_MAX + 1]; |
| 692 | |
| 693 | error = strncpy_from_user(kname, name, sizeof(kname)); |
| 694 | if (error == 0 || error == sizeof(kname)) |
| 695 | error = -ERANGE; |
| 696 | if (error < 0) |
| 697 | return error; |
| 698 | |
Christoph Hellwig | 5be196e | 2006-01-09 20:51:55 -0800 | [diff] [blame] | 699 | return vfs_removexattr(d, kname); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 700 | } |
| 701 | |
Eric Biggers | 8cc4311 | 2014-10-12 11:59:58 -0500 | [diff] [blame] | 702 | static int path_removexattr(const char __user *pathname, |
| 703 | const char __user *name, unsigned int lookup_flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 704 | { |
Al Viro | 2d8f303 | 2008-07-22 09:59:21 -0400 | [diff] [blame] | 705 | struct path path; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 706 | int error; |
Jeff Layton | 12f0621 | 2012-12-11 12:10:17 -0500 | [diff] [blame] | 707 | retry: |
| 708 | error = user_path_at(AT_FDCWD, pathname, lookup_flags, &path); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 709 | if (error) |
| 710 | return error; |
Al Viro | 2d8f303 | 2008-07-22 09:59:21 -0400 | [diff] [blame] | 711 | error = mnt_want_write(path.mnt); |
Dave Hansen | 18f335a | 2008-02-15 14:37:38 -0800 | [diff] [blame] | 712 | if (!error) { |
Al Viro | 2d8f303 | 2008-07-22 09:59:21 -0400 | [diff] [blame] | 713 | error = removexattr(path.dentry, name); |
| 714 | mnt_drop_write(path.mnt); |
Dave Hansen | 18f335a | 2008-02-15 14:37:38 -0800 | [diff] [blame] | 715 | } |
Al Viro | 2d8f303 | 2008-07-22 09:59:21 -0400 | [diff] [blame] | 716 | path_put(&path); |
Jeff Layton | 12f0621 | 2012-12-11 12:10:17 -0500 | [diff] [blame] | 717 | if (retry_estale(error, lookup_flags)) { |
| 718 | lookup_flags |= LOOKUP_REVAL; |
| 719 | goto retry; |
| 720 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 721 | return error; |
| 722 | } |
| 723 | |
Eric Biggers | 8cc4311 | 2014-10-12 11:59:58 -0500 | [diff] [blame] | 724 | SYSCALL_DEFINE2(removexattr, const char __user *, pathname, |
| 725 | const char __user *, name) |
| 726 | { |
| 727 | return path_removexattr(pathname, name, LOOKUP_FOLLOW); |
| 728 | } |
| 729 | |
Heiko Carstens | 6a6160a | 2009-01-14 14:14:15 +0100 | [diff] [blame] | 730 | SYSCALL_DEFINE2(lremovexattr, const char __user *, pathname, |
| 731 | const char __user *, name) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 732 | { |
Eric Biggers | 8cc4311 | 2014-10-12 11:59:58 -0500 | [diff] [blame] | 733 | return path_removexattr(pathname, name, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 734 | } |
| 735 | |
Heiko Carstens | 6a6160a | 2009-01-14 14:14:15 +0100 | [diff] [blame] | 736 | SYSCALL_DEFINE2(fremovexattr, int, fd, const char __user *, name) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 737 | { |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 738 | struct fd f = fdget(fd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 739 | int error = -EBADF; |
| 740 | |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 741 | if (!f.file) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 742 | return error; |
Al Viro | 9f45f5b | 2014-10-31 17:44:57 -0400 | [diff] [blame] | 743 | audit_file(f.file); |
Miklos Szeredi | 6742cee | 2018-07-18 15:44:43 +0200 | [diff] [blame] | 744 | error = mnt_want_write_file(f.file); |
Dave Hansen | 18f335a | 2008-02-15 14:37:38 -0800 | [diff] [blame] | 745 | if (!error) { |
Al Viro | 9f45f5b | 2014-10-31 17:44:57 -0400 | [diff] [blame] | 746 | error = removexattr(f.file->f_path.dentry, name); |
Miklos Szeredi | 6742cee | 2018-07-18 15:44:43 +0200 | [diff] [blame] | 747 | mnt_drop_write_file(f.file); |
Dave Hansen | 18f335a | 2008-02-15 14:37:38 -0800 | [diff] [blame] | 748 | } |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 749 | fdput(f); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 750 | return error; |
| 751 | } |
| 752 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 753 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 754 | * Combine the results of the list() operation from every xattr_handler in the |
| 755 | * list. |
| 756 | */ |
| 757 | ssize_t |
| 758 | generic_listxattr(struct dentry *dentry, char *buffer, size_t buffer_size) |
| 759 | { |
Stephen Hemminger | bb43545 | 2010-05-13 17:53:14 -0700 | [diff] [blame] | 760 | const struct xattr_handler *handler, **handlers = dentry->d_sb->s_xattr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 761 | unsigned int size = 0; |
| 762 | |
| 763 | if (!buffer) { |
Christoph Hellwig | 431547b | 2009-11-13 09:52:56 +0000 | [diff] [blame] | 764 | for_each_xattr_handler(handlers, handler) { |
Andreas Gruenbacher | 764a5c6 | 2015-12-02 14:44:43 +0100 | [diff] [blame] | 765 | if (!handler->name || |
| 766 | (handler->list && !handler->list(dentry))) |
Andreas Gruenbacher | c4803c4 | 2015-12-02 14:44:41 +0100 | [diff] [blame] | 767 | continue; |
Andreas Gruenbacher | 764a5c6 | 2015-12-02 14:44:43 +0100 | [diff] [blame] | 768 | size += strlen(handler->name) + 1; |
Christoph Hellwig | 431547b | 2009-11-13 09:52:56 +0000 | [diff] [blame] | 769 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 770 | } else { |
| 771 | char *buf = buffer; |
Andreas Gruenbacher | 764a5c6 | 2015-12-02 14:44:43 +0100 | [diff] [blame] | 772 | size_t len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 773 | |
| 774 | for_each_xattr_handler(handlers, handler) { |
Andreas Gruenbacher | 764a5c6 | 2015-12-02 14:44:43 +0100 | [diff] [blame] | 775 | if (!handler->name || |
| 776 | (handler->list && !handler->list(dentry))) |
Andreas Gruenbacher | c4803c4 | 2015-12-02 14:44:41 +0100 | [diff] [blame] | 777 | continue; |
Andreas Gruenbacher | 764a5c6 | 2015-12-02 14:44:43 +0100 | [diff] [blame] | 778 | len = strlen(handler->name); |
| 779 | if (len + 1 > buffer_size) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 780 | return -ERANGE; |
Andreas Gruenbacher | 764a5c6 | 2015-12-02 14:44:43 +0100 | [diff] [blame] | 781 | memcpy(buf, handler->name, len + 1); |
| 782 | buf += len + 1; |
| 783 | buffer_size -= len + 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 784 | } |
| 785 | size = buf - buffer; |
| 786 | } |
| 787 | return size; |
| 788 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 789 | EXPORT_SYMBOL(generic_listxattr); |
Aristeu Rozanski | 38f3865 | 2012-08-23 16:53:28 -0400 | [diff] [blame] | 790 | |
Andreas Gruenbacher | e409de9 | 2015-10-04 19:18:52 +0200 | [diff] [blame] | 791 | /** |
| 792 | * xattr_full_name - Compute full attribute name from suffix |
| 793 | * |
| 794 | * @handler: handler of the xattr_handler operation |
| 795 | * @name: name passed to the xattr_handler operation |
| 796 | * |
| 797 | * The get and set xattr handler operations are called with the remainder of |
| 798 | * the attribute name after skipping the handler's prefix: for example, "foo" |
| 799 | * is passed to the get operation of a handler with prefix "user." to get |
| 800 | * attribute "user.foo". The full name is still "there" in the name though. |
| 801 | * |
| 802 | * Note: the list xattr handler operation when called from the vfs is passed a |
| 803 | * NULL name; some file systems use this operation internally, with varying |
| 804 | * semantics. |
| 805 | */ |
| 806 | const char *xattr_full_name(const struct xattr_handler *handler, |
| 807 | const char *name) |
| 808 | { |
Andreas Gruenbacher | 98e9cb5 | 2015-12-02 14:44:36 +0100 | [diff] [blame] | 809 | size_t prefix_len = strlen(xattr_prefix(handler)); |
Andreas Gruenbacher | e409de9 | 2015-10-04 19:18:52 +0200 | [diff] [blame] | 810 | |
| 811 | return name - prefix_len; |
| 812 | } |
| 813 | EXPORT_SYMBOL(xattr_full_name); |
| 814 | |
Aristeu Rozanski | 38f3865 | 2012-08-23 16:53:28 -0400 | [diff] [blame] | 815 | /* |
| 816 | * Allocate new xattr and copy in the value; but leave the name to callers. |
| 817 | */ |
| 818 | struct simple_xattr *simple_xattr_alloc(const void *value, size_t size) |
| 819 | { |
| 820 | struct simple_xattr *new_xattr; |
| 821 | size_t len; |
| 822 | |
| 823 | /* wrap around? */ |
| 824 | len = sizeof(*new_xattr) + size; |
Hugh Dickins | 4e66d44 | 2014-07-23 14:00:17 -0700 | [diff] [blame] | 825 | if (len < sizeof(*new_xattr)) |
Aristeu Rozanski | 38f3865 | 2012-08-23 16:53:28 -0400 | [diff] [blame] | 826 | return NULL; |
| 827 | |
| 828 | new_xattr = kmalloc(len, GFP_KERNEL); |
| 829 | if (!new_xattr) |
| 830 | return NULL; |
| 831 | |
| 832 | new_xattr->size = size; |
| 833 | memcpy(new_xattr->value, value, size); |
| 834 | return new_xattr; |
| 835 | } |
| 836 | |
| 837 | /* |
| 838 | * xattr GET operation for in-memory/pseudo filesystems |
| 839 | */ |
| 840 | int simple_xattr_get(struct simple_xattrs *xattrs, const char *name, |
| 841 | void *buffer, size_t size) |
| 842 | { |
| 843 | struct simple_xattr *xattr; |
| 844 | int ret = -ENODATA; |
| 845 | |
| 846 | spin_lock(&xattrs->lock); |
| 847 | list_for_each_entry(xattr, &xattrs->head, list) { |
| 848 | if (strcmp(name, xattr->name)) |
| 849 | continue; |
| 850 | |
| 851 | ret = xattr->size; |
| 852 | if (buffer) { |
| 853 | if (size < xattr->size) |
| 854 | ret = -ERANGE; |
| 855 | else |
| 856 | memcpy(buffer, xattr->value, xattr->size); |
| 857 | } |
| 858 | break; |
| 859 | } |
| 860 | spin_unlock(&xattrs->lock); |
| 861 | return ret; |
| 862 | } |
| 863 | |
Andreas Gruenbacher | aa7c524 | 2015-12-02 14:44:38 +0100 | [diff] [blame] | 864 | /** |
| 865 | * simple_xattr_set - xattr SET operation for in-memory/pseudo filesystems |
| 866 | * @xattrs: target simple_xattr list |
| 867 | * @name: name of the extended attribute |
| 868 | * @value: value of the xattr. If %NULL, will remove the attribute. |
| 869 | * @size: size of the new xattr |
| 870 | * @flags: %XATTR_{CREATE|REPLACE} |
| 871 | * |
| 872 | * %XATTR_CREATE is set, the xattr shouldn't exist already; otherwise fails |
| 873 | * with -EEXIST. If %XATTR_REPLACE is set, the xattr should exist; |
| 874 | * otherwise, fails with -ENODATA. |
| 875 | * |
| 876 | * Returns 0 on success, -errno on failure. |
| 877 | */ |
| 878 | int simple_xattr_set(struct simple_xattrs *xattrs, const char *name, |
| 879 | const void *value, size_t size, int flags) |
Aristeu Rozanski | 38f3865 | 2012-08-23 16:53:28 -0400 | [diff] [blame] | 880 | { |
| 881 | struct simple_xattr *xattr; |
David Rientjes | 4338584 | 2012-10-17 20:41:15 -0700 | [diff] [blame] | 882 | struct simple_xattr *new_xattr = NULL; |
Aristeu Rozanski | 38f3865 | 2012-08-23 16:53:28 -0400 | [diff] [blame] | 883 | int err = 0; |
| 884 | |
| 885 | /* value == NULL means remove */ |
| 886 | if (value) { |
| 887 | new_xattr = simple_xattr_alloc(value, size); |
| 888 | if (!new_xattr) |
| 889 | return -ENOMEM; |
| 890 | |
| 891 | new_xattr->name = kstrdup(name, GFP_KERNEL); |
| 892 | if (!new_xattr->name) { |
| 893 | kfree(new_xattr); |
| 894 | return -ENOMEM; |
| 895 | } |
| 896 | } |
| 897 | |
| 898 | spin_lock(&xattrs->lock); |
| 899 | list_for_each_entry(xattr, &xattrs->head, list) { |
| 900 | if (!strcmp(name, xattr->name)) { |
| 901 | if (flags & XATTR_CREATE) { |
| 902 | xattr = new_xattr; |
| 903 | err = -EEXIST; |
| 904 | } else if (new_xattr) { |
| 905 | list_replace(&xattr->list, &new_xattr->list); |
| 906 | } else { |
| 907 | list_del(&xattr->list); |
| 908 | } |
| 909 | goto out; |
| 910 | } |
| 911 | } |
| 912 | if (flags & XATTR_REPLACE) { |
| 913 | xattr = new_xattr; |
| 914 | err = -ENODATA; |
| 915 | } else { |
| 916 | list_add(&new_xattr->list, &xattrs->head); |
| 917 | xattr = NULL; |
| 918 | } |
| 919 | out: |
| 920 | spin_unlock(&xattrs->lock); |
| 921 | if (xattr) { |
| 922 | kfree(xattr->name); |
| 923 | kfree(xattr); |
| 924 | } |
| 925 | return err; |
| 926 | |
| 927 | } |
| 928 | |
Aristeu Rozanski | 38f3865 | 2012-08-23 16:53:28 -0400 | [diff] [blame] | 929 | static bool xattr_is_trusted(const char *name) |
| 930 | { |
| 931 | return !strncmp(name, XATTR_TRUSTED_PREFIX, XATTR_TRUSTED_PREFIX_LEN); |
| 932 | } |
| 933 | |
Andreas Gruenbacher | 786534b | 2015-12-02 14:44:39 +0100 | [diff] [blame] | 934 | static int xattr_list_one(char **buffer, ssize_t *remaining_size, |
| 935 | const char *name) |
| 936 | { |
| 937 | size_t len = strlen(name) + 1; |
| 938 | if (*buffer) { |
| 939 | if (*remaining_size < len) |
| 940 | return -ERANGE; |
| 941 | memcpy(*buffer, name, len); |
| 942 | *buffer += len; |
| 943 | } |
| 944 | *remaining_size -= len; |
| 945 | return 0; |
| 946 | } |
| 947 | |
Aristeu Rozanski | 38f3865 | 2012-08-23 16:53:28 -0400 | [diff] [blame] | 948 | /* |
| 949 | * xattr LIST operation for in-memory/pseudo filesystems |
| 950 | */ |
Andreas Gruenbacher | 786534b | 2015-12-02 14:44:39 +0100 | [diff] [blame] | 951 | ssize_t simple_xattr_list(struct inode *inode, struct simple_xattrs *xattrs, |
| 952 | char *buffer, size_t size) |
Aristeu Rozanski | 38f3865 | 2012-08-23 16:53:28 -0400 | [diff] [blame] | 953 | { |
| 954 | bool trusted = capable(CAP_SYS_ADMIN); |
| 955 | struct simple_xattr *xattr; |
Andreas Gruenbacher | 786534b | 2015-12-02 14:44:39 +0100 | [diff] [blame] | 956 | ssize_t remaining_size = size; |
Mateusz Guzik | 0e9a7da | 2016-02-04 02:56:30 +0100 | [diff] [blame] | 957 | int err = 0; |
Andreas Gruenbacher | 786534b | 2015-12-02 14:44:39 +0100 | [diff] [blame] | 958 | |
| 959 | #ifdef CONFIG_FS_POSIX_ACL |
Andreas Gruenbacher | ffc4c92 | 2018-09-18 00:36:36 -0400 | [diff] [blame] | 960 | if (IS_POSIXACL(inode)) { |
| 961 | if (inode->i_acl) { |
| 962 | err = xattr_list_one(&buffer, &remaining_size, |
| 963 | XATTR_NAME_POSIX_ACL_ACCESS); |
| 964 | if (err) |
| 965 | return err; |
| 966 | } |
| 967 | if (inode->i_default_acl) { |
| 968 | err = xattr_list_one(&buffer, &remaining_size, |
| 969 | XATTR_NAME_POSIX_ACL_DEFAULT); |
| 970 | if (err) |
| 971 | return err; |
| 972 | } |
Andreas Gruenbacher | 786534b | 2015-12-02 14:44:39 +0100 | [diff] [blame] | 973 | } |
| 974 | #endif |
Aristeu Rozanski | 38f3865 | 2012-08-23 16:53:28 -0400 | [diff] [blame] | 975 | |
| 976 | spin_lock(&xattrs->lock); |
| 977 | list_for_each_entry(xattr, &xattrs->head, list) { |
Aristeu Rozanski | 38f3865 | 2012-08-23 16:53:28 -0400 | [diff] [blame] | 978 | /* skip "trusted." attributes for unprivileged callers */ |
| 979 | if (!trusted && xattr_is_trusted(xattr->name)) |
| 980 | continue; |
| 981 | |
Andreas Gruenbacher | 786534b | 2015-12-02 14:44:39 +0100 | [diff] [blame] | 982 | err = xattr_list_one(&buffer, &remaining_size, xattr->name); |
| 983 | if (err) |
Mateusz Guzik | 0e9a7da | 2016-02-04 02:56:30 +0100 | [diff] [blame] | 984 | break; |
Aristeu Rozanski | 38f3865 | 2012-08-23 16:53:28 -0400 | [diff] [blame] | 985 | } |
| 986 | spin_unlock(&xattrs->lock); |
| 987 | |
Mateusz Guzik | 0e9a7da | 2016-02-04 02:56:30 +0100 | [diff] [blame] | 988 | return err ? err : size - remaining_size; |
Aristeu Rozanski | 38f3865 | 2012-08-23 16:53:28 -0400 | [diff] [blame] | 989 | } |
| 990 | |
Aristeu Rozanski | 4895768 | 2012-09-11 16:28:11 -0400 | [diff] [blame] | 991 | /* |
| 992 | * Adds an extended attribute to the list |
| 993 | */ |
Aristeu Rozanski | 38f3865 | 2012-08-23 16:53:28 -0400 | [diff] [blame] | 994 | void simple_xattr_list_add(struct simple_xattrs *xattrs, |
| 995 | struct simple_xattr *new_xattr) |
| 996 | { |
| 997 | spin_lock(&xattrs->lock); |
| 998 | list_add(&new_xattr->list, &xattrs->head); |
| 999 | spin_unlock(&xattrs->lock); |
| 1000 | } |