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->i_ctime = current_time(inode); 195 di->i_mode = cpu_to_le16(inode->i_mode); 196 di->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec); 197 di->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec); 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 user_namespace *mnt_userns, 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(&init_user_ns, 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 } 411