| 1 | // SPDX-License-Identifier: GPL-2.0-only |
| 2 | /* |
| 3 | * acl.c |
| 4 | * |
| 5 | * Copyright (C) 2004, 2008 Oracle. All rights reserved. |
| 6 | * |
| 7 | * CREDITS: |
| 8 | * Lots of code in this file is copy from linux/fs/ext3/acl.c. |
| 9 | * Copyright (C) 2001-2003 Andreas Gruenbacher, <agruen@suse.de> |
| 10 | */ |
| 11 | |
| 12 | #include <linux/init.h> |
| 13 | #include <linux/module.h> |
| 14 | #include <linux/slab.h> |
| 15 | #include <linux/string.h> |
| 16 | |
| 17 | #include <cluster/masklog.h> |
| 18 | |
| 19 | #include "ocfs2.h" |
| 20 | #include "alloc.h" |
| 21 | #include "dlmglue.h" |
| 22 | #include "file.h" |
| 23 | #include "inode.h" |
| 24 | #include "journal.h" |
| 25 | #include "ocfs2_fs.h" |
| 26 | |
| 27 | #include "xattr.h" |
| 28 | #include "acl.h" |
| 29 | |
| 30 | /* |
| 31 | * Convert from xattr value to acl struct. |
| 32 | */ |
| 33 | static struct posix_acl *ocfs2_acl_from_xattr(const void *value, size_t size) |
| 34 | { |
| 35 | int n, count; |
| 36 | struct posix_acl *acl; |
| 37 | |
| 38 | if (!value) |
| 39 | return NULL; |
| 40 | if (size < sizeof(struct posix_acl_entry)) |
| 41 | return ERR_PTR(-EINVAL); |
| 42 | |
| 43 | count = size / sizeof(struct posix_acl_entry); |
| 44 | |
| 45 | acl = posix_acl_alloc(count, GFP_NOFS); |
| 46 | if (!acl) |
| 47 | return ERR_PTR(-ENOMEM); |
| 48 | for (n = 0; n < count; n++) { |
| 49 | struct ocfs2_acl_entry *entry = |
| 50 | (struct ocfs2_acl_entry *)value; |
| 51 | |
| 52 | acl->a_entries[n].e_tag = le16_to_cpu(entry->e_tag); |
| 53 | acl->a_entries[n].e_perm = le16_to_cpu(entry->e_perm); |
| 54 | switch(acl->a_entries[n].e_tag) { |
| 55 | case ACL_USER: |
| 56 | acl->a_entries[n].e_uid = |
| 57 | make_kuid(&init_user_ns, |
| 58 | le32_to_cpu(entry->e_id)); |
| 59 | break; |
| 60 | case ACL_GROUP: |
| 61 | acl->a_entries[n].e_gid = |
| 62 | make_kgid(&init_user_ns, |
| 63 | le32_to_cpu(entry->e_id)); |
| 64 | break; |
| 65 | default: |
| 66 | break; |
| 67 | } |
| 68 | value += sizeof(struct posix_acl_entry); |
| 69 | |
| 70 | } |
| 71 | return acl; |
| 72 | } |
| 73 | |
| 74 | /* |
| 75 | * Convert acl struct to xattr value. |
| 76 | */ |
| 77 | static void *ocfs2_acl_to_xattr(const struct posix_acl *acl, size_t *size) |
| 78 | { |
| 79 | struct ocfs2_acl_entry *entry = NULL; |
| 80 | char *ocfs2_acl; |
| 81 | size_t n; |
| 82 | |
| 83 | *size = acl->a_count * sizeof(struct posix_acl_entry); |
| 84 | |
| 85 | ocfs2_acl = kmalloc(*size, GFP_NOFS); |
| 86 | if (!ocfs2_acl) |
| 87 | return ERR_PTR(-ENOMEM); |
| 88 | |
| 89 | entry = (struct ocfs2_acl_entry *)ocfs2_acl; |
| 90 | for (n = 0; n < acl->a_count; n++, entry++) { |
| 91 | entry->e_tag = cpu_to_le16(acl->a_entries[n].e_tag); |
| 92 | entry->e_perm = cpu_to_le16(acl->a_entries[n].e_perm); |
| 93 | switch(acl->a_entries[n].e_tag) { |
| 94 | case ACL_USER: |
| 95 | entry->e_id = cpu_to_le32( |
| 96 | from_kuid(&init_user_ns, |
| 97 | acl->a_entries[n].e_uid)); |
| 98 | break; |
| 99 | case ACL_GROUP: |
| 100 | entry->e_id = cpu_to_le32( |
| 101 | from_kgid(&init_user_ns, |
| 102 | acl->a_entries[n].e_gid)); |
| 103 | break; |
| 104 | default: |
| 105 | entry->e_id = cpu_to_le32(ACL_UNDEFINED_ID); |
| 106 | break; |
| 107 | } |
| 108 | } |
| 109 | return ocfs2_acl; |
| 110 | } |
| 111 | |
| 112 | static struct posix_acl *ocfs2_get_acl_nolock(struct inode *inode, |
| 113 | int type, |
| 114 | struct buffer_head *di_bh) |
| 115 | { |
| 116 | int name_index; |
| 117 | char *value = NULL; |
| 118 | struct posix_acl *acl; |
| 119 | int retval; |
| 120 | |
| 121 | switch (type) { |
| 122 | case ACL_TYPE_ACCESS: |
| 123 | name_index = OCFS2_XATTR_INDEX_POSIX_ACL_ACCESS; |
| 124 | break; |
| 125 | case ACL_TYPE_DEFAULT: |
| 126 | name_index = OCFS2_XATTR_INDEX_POSIX_ACL_DEFAULT; |
| 127 | break; |
| 128 | default: |
| 129 | return ERR_PTR(-EINVAL); |
| 130 | } |
| 131 | |
| 132 | retval = ocfs2_xattr_get_nolock(inode, di_bh, name_index, "", NULL, 0); |
| 133 | if (retval > 0) { |
| 134 | value = kmalloc(retval, GFP_NOFS); |
| 135 | if (!value) |
| 136 | return ERR_PTR(-ENOMEM); |
| 137 | retval = ocfs2_xattr_get_nolock(inode, di_bh, name_index, |
| 138 | "", value, retval); |
| 139 | } |
| 140 | |
| 141 | if (retval > 0) |
| 142 | acl = ocfs2_acl_from_xattr(value, retval); |
| 143 | else if (retval == -ENODATA || retval == 0) |
| 144 | acl = NULL; |
| 145 | else |
| 146 | acl = ERR_PTR(retval); |
| 147 | |
| 148 | kfree(value); |
| 149 | |
| 150 | return acl; |
| 151 | } |
| 152 | |
| 153 | /* |
| 154 | * Helper function to set i_mode in memory and disk. Some call paths |
| 155 | * will not have di_bh or a journal handle to pass, in which case it |
| 156 | * will create it's own. |
| 157 | */ |
| 158 | static int ocfs2_acl_set_mode(struct inode *inode, struct buffer_head *di_bh, |
| 159 | handle_t *handle, umode_t new_mode) |
| 160 | { |
| 161 | int ret, commit_handle = 0; |
| 162 | struct ocfs2_dinode *di; |
| 163 | |
| 164 | if (di_bh == NULL) { |
| 165 | ret = ocfs2_read_inode_block(inode, &di_bh); |
| 166 | if (ret) { |
| 167 | mlog_errno(ret); |
| 168 | goto out; |
| 169 | } |
| 170 | } else |
| 171 | get_bh(di_bh); |
| 172 | |
| 173 | if (handle == NULL) { |
| 174 | handle = ocfs2_start_trans(OCFS2_SB(inode->i_sb), |
| 175 | OCFS2_INODE_UPDATE_CREDITS); |
| 176 | if (IS_ERR(handle)) { |
| 177 | ret = PTR_ERR(handle); |
| 178 | mlog_errno(ret); |
| 179 | goto out_brelse; |
| 180 | } |
| 181 | |
| 182 | commit_handle = 1; |
| 183 | } |
| 184 | |
| 185 | di = (struct ocfs2_dinode *)di_bh->b_data; |
| 186 | ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), di_bh, |
| 187 | OCFS2_JOURNAL_ACCESS_WRITE); |
| 188 | if (ret) { |
| 189 | mlog_errno(ret); |
| 190 | goto out_commit; |
| 191 | } |
| 192 | |
| 193 | inode->i_mode = new_mode; |
| 194 | inode_set_ctime_current(inode); |
| 195 | di->i_mode = cpu_to_le16(inode->i_mode); |
| 196 | di->i_ctime = cpu_to_le64(inode_get_ctime_sec(inode)); |
| 197 | di->i_ctime_nsec = cpu_to_le32(inode_get_ctime_nsec(inode)); |
| 198 | ocfs2_update_inode_fsync_trans(handle, inode, 0); |
| 199 | |
| 200 | ocfs2_journal_dirty(handle, di_bh); |
| 201 | |
| 202 | out_commit: |
| 203 | if (commit_handle) |
| 204 | ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle); |
| 205 | out_brelse: |
| 206 | brelse(di_bh); |
| 207 | out: |
| 208 | return ret; |
| 209 | } |
| 210 | |
| 211 | /* |
| 212 | * Set the access or default ACL of an inode. |
| 213 | */ |
| 214 | static int ocfs2_set_acl(handle_t *handle, |
| 215 | struct inode *inode, |
| 216 | struct buffer_head *di_bh, |
| 217 | int type, |
| 218 | struct posix_acl *acl, |
| 219 | struct ocfs2_alloc_context *meta_ac, |
| 220 | struct ocfs2_alloc_context *data_ac) |
| 221 | { |
| 222 | int name_index; |
| 223 | void *value = NULL; |
| 224 | size_t size = 0; |
| 225 | int ret; |
| 226 | |
| 227 | if (S_ISLNK(inode->i_mode)) |
| 228 | return -EOPNOTSUPP; |
| 229 | |
| 230 | switch (type) { |
| 231 | case ACL_TYPE_ACCESS: |
| 232 | name_index = OCFS2_XATTR_INDEX_POSIX_ACL_ACCESS; |
| 233 | break; |
| 234 | case ACL_TYPE_DEFAULT: |
| 235 | name_index = OCFS2_XATTR_INDEX_POSIX_ACL_DEFAULT; |
| 236 | if (!S_ISDIR(inode->i_mode)) |
| 237 | return acl ? -EACCES : 0; |
| 238 | break; |
| 239 | default: |
| 240 | return -EINVAL; |
| 241 | } |
| 242 | |
| 243 | if (acl) { |
| 244 | value = ocfs2_acl_to_xattr(acl, &size); |
| 245 | if (IS_ERR(value)) |
| 246 | return (int)PTR_ERR(value); |
| 247 | } |
| 248 | |
| 249 | if (handle) |
| 250 | ret = ocfs2_xattr_set_handle(handle, inode, di_bh, name_index, |
| 251 | "", value, size, 0, |
| 252 | meta_ac, data_ac); |
| 253 | else |
| 254 | ret = ocfs2_xattr_set(inode, name_index, "", value, size, 0); |
| 255 | |
| 256 | kfree(value); |
| 257 | if (!ret) |
| 258 | set_cached_acl(inode, type, acl); |
| 259 | |
| 260 | return ret; |
| 261 | } |
| 262 | |
| 263 | int ocfs2_iop_set_acl(struct mnt_idmap *idmap, struct dentry *dentry, |
| 264 | struct posix_acl *acl, int type) |
| 265 | { |
| 266 | struct buffer_head *bh = NULL; |
| 267 | int status, had_lock; |
| 268 | struct ocfs2_lock_holder oh; |
| 269 | struct inode *inode = d_inode(dentry); |
| 270 | |
| 271 | had_lock = ocfs2_inode_lock_tracker(inode, &bh, 1, &oh); |
| 272 | if (had_lock < 0) |
| 273 | return had_lock; |
| 274 | if (type == ACL_TYPE_ACCESS && acl) { |
| 275 | umode_t mode; |
| 276 | |
| 277 | status = posix_acl_update_mode(&nop_mnt_idmap, inode, &mode, |
| 278 | &acl); |
| 279 | if (status) |
| 280 | goto unlock; |
| 281 | |
| 282 | status = ocfs2_acl_set_mode(inode, bh, NULL, mode); |
| 283 | if (status) |
| 284 | goto unlock; |
| 285 | } |
| 286 | status = ocfs2_set_acl(NULL, inode, bh, type, acl, NULL, NULL); |
| 287 | unlock: |
| 288 | ocfs2_inode_unlock_tracker(inode, 1, &oh, had_lock); |
| 289 | brelse(bh); |
| 290 | return status; |
| 291 | } |
| 292 | |
| 293 | struct posix_acl *ocfs2_iop_get_acl(struct inode *inode, int type, bool rcu) |
| 294 | { |
| 295 | struct ocfs2_super *osb; |
| 296 | struct buffer_head *di_bh = NULL; |
| 297 | struct posix_acl *acl; |
| 298 | int had_lock; |
| 299 | struct ocfs2_lock_holder oh; |
| 300 | |
| 301 | if (rcu) |
| 302 | return ERR_PTR(-ECHILD); |
| 303 | |
| 304 | osb = OCFS2_SB(inode->i_sb); |
| 305 | if (!(osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL)) |
| 306 | return NULL; |
| 307 | |
| 308 | had_lock = ocfs2_inode_lock_tracker(inode, &di_bh, 0, &oh); |
| 309 | if (had_lock < 0) |
| 310 | return ERR_PTR(had_lock); |
| 311 | |
| 312 | down_read(&OCFS2_I(inode)->ip_xattr_sem); |
| 313 | acl = ocfs2_get_acl_nolock(inode, type, di_bh); |
| 314 | up_read(&OCFS2_I(inode)->ip_xattr_sem); |
| 315 | |
| 316 | ocfs2_inode_unlock_tracker(inode, 0, &oh, had_lock); |
| 317 | brelse(di_bh); |
| 318 | return acl; |
| 319 | } |
| 320 | |
| 321 | int ocfs2_acl_chmod(struct inode *inode, struct buffer_head *bh) |
| 322 | { |
| 323 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
| 324 | struct posix_acl *acl; |
| 325 | int ret; |
| 326 | |
| 327 | if (S_ISLNK(inode->i_mode)) |
| 328 | return -EOPNOTSUPP; |
| 329 | |
| 330 | if (!(osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL)) |
| 331 | return 0; |
| 332 | |
| 333 | down_read(&OCFS2_I(inode)->ip_xattr_sem); |
| 334 | acl = ocfs2_get_acl_nolock(inode, ACL_TYPE_ACCESS, bh); |
| 335 | up_read(&OCFS2_I(inode)->ip_xattr_sem); |
| 336 | if (IS_ERR_OR_NULL(acl)) |
| 337 | return PTR_ERR_OR_ZERO(acl); |
| 338 | ret = __posix_acl_chmod(&acl, GFP_KERNEL, inode->i_mode); |
| 339 | if (ret) |
| 340 | return ret; |
| 341 | ret = ocfs2_set_acl(NULL, inode, NULL, ACL_TYPE_ACCESS, |
| 342 | acl, NULL, NULL); |
| 343 | posix_acl_release(acl); |
| 344 | return ret; |
| 345 | } |
| 346 | |
| 347 | /* |
| 348 | * Initialize the ACLs of a new inode. If parent directory has default ACL, |
| 349 | * then clone to new inode. Called from ocfs2_mknod. |
| 350 | */ |
| 351 | int ocfs2_init_acl(handle_t *handle, |
| 352 | struct inode *inode, |
| 353 | struct inode *dir, |
| 354 | struct buffer_head *di_bh, |
| 355 | struct buffer_head *dir_bh, |
| 356 | struct ocfs2_alloc_context *meta_ac, |
| 357 | struct ocfs2_alloc_context *data_ac) |
| 358 | { |
| 359 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
| 360 | struct posix_acl *acl = NULL; |
| 361 | int ret = 0, ret2; |
| 362 | umode_t mode; |
| 363 | |
| 364 | if (!S_ISLNK(inode->i_mode)) { |
| 365 | if (osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL) { |
| 366 | down_read(&OCFS2_I(dir)->ip_xattr_sem); |
| 367 | acl = ocfs2_get_acl_nolock(dir, ACL_TYPE_DEFAULT, |
| 368 | dir_bh); |
| 369 | up_read(&OCFS2_I(dir)->ip_xattr_sem); |
| 370 | if (IS_ERR(acl)) |
| 371 | return PTR_ERR(acl); |
| 372 | } |
| 373 | if (!acl) { |
| 374 | mode = inode->i_mode & ~current_umask(); |
| 375 | ret = ocfs2_acl_set_mode(inode, di_bh, handle, mode); |
| 376 | if (ret) { |
| 377 | mlog_errno(ret); |
| 378 | goto cleanup; |
| 379 | } |
| 380 | } |
| 381 | } |
| 382 | if ((osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL) && acl) { |
| 383 | if (S_ISDIR(inode->i_mode)) { |
| 384 | ret = ocfs2_set_acl(handle, inode, di_bh, |
| 385 | ACL_TYPE_DEFAULT, acl, |
| 386 | meta_ac, data_ac); |
| 387 | if (ret) |
| 388 | goto cleanup; |
| 389 | } |
| 390 | mode = inode->i_mode; |
| 391 | ret = __posix_acl_create(&acl, GFP_NOFS, &mode); |
| 392 | if (ret < 0) |
| 393 | return ret; |
| 394 | |
| 395 | ret2 = ocfs2_acl_set_mode(inode, di_bh, handle, mode); |
| 396 | if (ret2) { |
| 397 | mlog_errno(ret2); |
| 398 | ret = ret2; |
| 399 | goto cleanup; |
| 400 | } |
| 401 | if (ret > 0) { |
| 402 | ret = ocfs2_set_acl(handle, inode, |
| 403 | di_bh, ACL_TYPE_ACCESS, |
| 404 | acl, meta_ac, data_ac); |
| 405 | } |
| 406 | } |
| 407 | cleanup: |
| 408 | posix_acl_release(acl); |
| 409 | return ret; |
| 410 | } |