1 // SPDX-License-Identifier: GPL-2.0-only
3  * Copyright (C) 2017-2018 HUAWEI, Inc.
5  * Copyright (C) 2021-2022, Alibaba Cloud
22 	struct qstr name;  member
34 	struct super_block *sb = inode->i_sb;  in erofs_init_inode_xattrs()
38 	if (test_bit(EROFS_I_EA_INITED_BIT, &vi->flags)) {  in erofs_init_inode_xattrs()
47 	if (wait_on_bit_lock(&vi->flags, EROFS_I_BL_XATTR_BIT, TASK_KILLABLE))  in erofs_init_inode_xattrs()
48 		return -ERESTARTSYS;  in erofs_init_inode_xattrs()
51 	if (test_bit(EROFS_I_EA_INITED_BIT, &vi->flags))  in erofs_init_inode_xattrs()
55 	 * bypass all xattr operations if ->xattr_isize is not greater than  in erofs_init_inode_xattrs()
58 	 *    ->xattr_isize should be 0 (it means no xattr);  in erofs_init_inode_xattrs()
59 	 * 2) it is just to contain erofs_xattr_ibody_header, which is on-disk  in erofs_init_inode_xattrs()
62 	if (vi->xattr_isize == sizeof(struct erofs_xattr_ibody_header)) {  in erofs_init_inode_xattrs()
65 			  vi->xattr_isize, vi->nid);  in erofs_init_inode_xattrs()
66 		ret = -EOPNOTSUPP;  in erofs_init_inode_xattrs()
68 	} else if (vi->xattr_isize < sizeof(struct erofs_xattr_ibody_header)) {  in erofs_init_inode_xattrs()
69 		if (vi->xattr_isize) {  in erofs_init_inode_xattrs()
70 			erofs_err(sb, "bogus xattr ibody @ nid %llu", vi->nid);  in erofs_init_inode_xattrs()
72 			ret = -EFSCORRUPTED;  in erofs_init_inode_xattrs()
75 		ret = -ENOATTR;  in erofs_init_inode_xattrs()
81 	it.pos = erofs_iloc(inode) + vi->inode_isize;  in erofs_init_inode_xattrs()
83 	/* read in shared xattr array (non-atomic, see kmalloc below) */  in erofs_init_inode_xattrs()
91 	vi->xattr_name_filter = le32_to_cpu(ih->h_name_filter);  in erofs_init_inode_xattrs()
92 	vi->xattr_shared_count = ih->h_shared_count;  in erofs_init_inode_xattrs()
93 	vi->xattr_shared_xattrs = kmalloc_array(vi->xattr_shared_count,  in erofs_init_inode_xattrs()
95 	if (!vi->xattr_shared_xattrs) {  in erofs_init_inode_xattrs()
97 		ret = -ENOMEM;  in erofs_init_inode_xattrs()
104 	for (i = 0; i < vi->xattr_shared_count; ++i) {  in erofs_init_inode_xattrs()
107 			kfree(vi->xattr_shared_xattrs);  in erofs_init_inode_xattrs()
108 			vi->xattr_shared_xattrs = NULL;  in erofs_init_inode_xattrs()
112 		vi->xattr_shared_xattrs[i] = le32_to_cpu(*(__le32 *)it.kaddr);  in erofs_init_inode_xattrs()
119 	set_bit(EROFS_I_EA_INITED_BIT, &vi->flags);  in erofs_init_inode_xattrs()
122 	clear_and_wake_up_bit(EROFS_I_BL_XATTR_BIT, &vi->flags);  in erofs_init_inode_xattrs()
128 	return test_opt(&EROFS_SB(dentry->d_sb)->opt, XATTR_USER);  in erofs_xattr_user_list()
138 				   const char *name, void *buffer, size_t size)  in erofs_xattr_generic_get()  argument
140 	if (handler->flags == EROFS_XATTR_INDEX_USER &&  in erofs_xattr_generic_get()
141 	    !test_opt(&EROFS_I_SB(inode)->opt, XATTR_USER))  in erofs_xattr_generic_get()
142 		return -EOPNOTSUPP;  in erofs_xattr_generic_get()
144 	return erofs_getxattr(inode, handler->flags, name, buffer, size);  in erofs_xattr_generic_get()
148 	.prefix	= XATTR_USER_PREFIX,
155 	.prefix	= XATTR_TRUSTED_PREFIX,
163 	.prefix	= XATTR_SECURITY_PREFIX,
182 	struct super_block *sb = it->sb;  in erofs_xattr_copy_to_buffer()
186 		it->kaddr = erofs_bread(&it->buf, it->pos, EROFS_KMAP);  in erofs_xattr_copy_to_buffer()
187 		if (IS_ERR(it->kaddr))  in erofs_xattr_copy_to_buffer()
188 			return PTR_ERR(it->kaddr);  in erofs_xattr_copy_to_buffer()
190 		src = it->kaddr;  in erofs_xattr_copy_to_buffer()
191 		slice = min_t(unsigned int, sb->s_blocksize -  in erofs_xattr_copy_to_buffer()
192 				erofs_blkoff(sb, it->pos), len - processed);  in erofs_xattr_copy_to_buffer()
193 		memcpy(it->buffer + it->buffer_ofs, src, slice);  in erofs_xattr_copy_to_buffer()
194 		it->buffer_ofs += slice;  in erofs_xattr_copy_to_buffer()
195 		it->pos += slice;  in erofs_xattr_copy_to_buffer()
204 	const char *prefix, *infix = NULL;  in erofs_listxattr_foreach()  local
208 	entry = *(struct erofs_xattr_entry *)it->kaddr;  in erofs_listxattr_foreach()
209 	it->pos += sizeof(struct erofs_xattr_entry);  in erofs_listxattr_foreach()
213 		struct erofs_sb_info *sbi = EROFS_SB(it->sb);  in erofs_listxattr_foreach()
214 		struct erofs_xattr_prefix_item *pf = sbi->xattr_prefixes +  in erofs_listxattr_foreach()
217 		if (pf >= sbi->xattr_prefixes + sbi->xattr_prefix_count)  in erofs_listxattr_foreach()
219 		infix = pf->prefix->infix;  in erofs_listxattr_foreach()
220 		infix_len = pf->infix_len;  in erofs_listxattr_foreach()
221 		base_index = pf->prefix->base_index;  in erofs_listxattr_foreach()
224 	prefix = erofs_xattr_prefix(base_index, it->dentry);  in erofs_listxattr_foreach()
225 	if (!prefix)  in erofs_listxattr_foreach()
227 	prefix_len = strlen(prefix);  in erofs_listxattr_foreach()
230 	if (!it->buffer) {  in erofs_listxattr_foreach()
231 		it->buffer_ofs += name_total;  in erofs_listxattr_foreach()
235 	if (it->buffer_ofs + name_total > it->buffer_size)  in erofs_listxattr_foreach()
236 		return -ERANGE;  in erofs_listxattr_foreach()
238 	memcpy(it->buffer + it->buffer_ofs, prefix, prefix_len);  in erofs_listxattr_foreach()
239 	memcpy(it->buffer + it->buffer_ofs + prefix_len, infix, infix_len);  in erofs_listxattr_foreach()
240 	it->buffer_ofs += prefix_len + infix_len;  in erofs_listxattr_foreach()
242 	/* 2. handle xattr name */  in erofs_listxattr_foreach()
247 	it->buffer[it->buffer_ofs++] = '\0';  in erofs_listxattr_foreach()
253 	struct super_block *sb = it->sb;  in erofs_getxattr_foreach()
258 	entry = *(struct erofs_xattr_entry *)it->kaddr;  in erofs_getxattr_foreach()
259 	it->pos += sizeof(struct erofs_xattr_entry);  in erofs_getxattr_foreach()
262 	/* should also match the infix for long name prefixes */  in erofs_getxattr_foreach()
265 		struct erofs_xattr_prefix_item *pf = sbi->xattr_prefixes +  in erofs_getxattr_foreach()
268 		if (pf >= sbi->xattr_prefixes + sbi->xattr_prefix_count)  in erofs_getxattr_foreach()
269 			return -ENOATTR;  in erofs_getxattr_foreach()
271 		if (it->index != pf->prefix->base_index ||  in erofs_getxattr_foreach()
272 		    it->name.len != entry.e_name_len + pf->infix_len)  in erofs_getxattr_foreach()
273 			return -ENOATTR;  in erofs_getxattr_foreach()
275 		if (memcmp(it->name.name, pf->prefix->infix, pf->infix_len))  in erofs_getxattr_foreach()
276 			return -ENOATTR;  in erofs_getxattr_foreach()
278 		it->infix_len = pf->infix_len;  in erofs_getxattr_foreach()
280 		if (it->index != entry.e_name_index ||  in erofs_getxattr_foreach()
281 		    it->name.len != entry.e_name_len)  in erofs_getxattr_foreach()
282 			return -ENOATTR;  in erofs_getxattr_foreach()
284 		it->infix_len = 0;  in erofs_getxattr_foreach()
287 	/* 2. handle xattr name */  in erofs_getxattr_foreach()
289 		it->kaddr = erofs_bread(&it->buf, it->pos, EROFS_KMAP);  in erofs_getxattr_foreach()
290 		if (IS_ERR(it->kaddr))  in erofs_getxattr_foreach()
291 			return PTR_ERR(it->kaddr);  in erofs_getxattr_foreach()
294 				sb->s_blocksize - erofs_blkoff(sb, it->pos),  in erofs_getxattr_foreach()
295 				entry.e_name_len - processed);  in erofs_getxattr_foreach()
296 		if (memcmp(it->name.name + it->infix_len + processed,  in erofs_getxattr_foreach()
297 			   it->kaddr, slice))  in erofs_getxattr_foreach()
298 			return -ENOATTR;  in erofs_getxattr_foreach()
299 		it->pos += slice;  in erofs_getxattr_foreach()
303 	if (!it->buffer) {  in erofs_getxattr_foreach()
304 		it->buffer_ofs = value_sz;  in erofs_getxattr_foreach()
308 	if (it->buffer_size < value_sz)  in erofs_getxattr_foreach()
309 		return -ERANGE;  in erofs_getxattr_foreach()
323 			  sizeof(u32) * vi->xattr_shared_count;  in erofs_xattr_iter_inline()
324 	if (xattr_header_sz >= vi->xattr_isize) {  in erofs_xattr_iter_inline()
325 		DBG_BUGON(xattr_header_sz > vi->xattr_isize);  in erofs_xattr_iter_inline()
326 		return -ENOATTR;  in erofs_xattr_iter_inline()
329 	remaining = vi->xattr_isize - xattr_header_sz;  in erofs_xattr_iter_inline()
330 	it->pos = erofs_iloc(inode) + vi->inode_isize + xattr_header_sz;  in erofs_xattr_iter_inline()
333 		it->kaddr = erofs_bread(&it->buf, it->pos, EROFS_KMAP);  in erofs_xattr_iter_inline()
334 		if (IS_ERR(it->kaddr))  in erofs_xattr_iter_inline()
335 			return PTR_ERR(it->kaddr);  in erofs_xattr_iter_inline()
337 		entry_sz = erofs_xattr_entry_size(it->kaddr);  in erofs_xattr_iter_inline()
338 		/* xattr on-disk corruption: xattr entry beyond xattr_isize */  in erofs_xattr_iter_inline()
341 			return -EFSCORRUPTED;  in erofs_xattr_iter_inline()
343 		remaining -= entry_sz;  in erofs_xattr_iter_inline()
344 		next_pos = it->pos + entry_sz;  in erofs_xattr_iter_inline()
350 		if ((getxattr && ret != -ENOATTR) || (!getxattr && ret))  in erofs_xattr_iter_inline()
353 		it->pos = next_pos;  in erofs_xattr_iter_inline()
362 	struct super_block *const sb = it->sb;  in erofs_xattr_iter_shared()
365 	int ret = -ENOATTR;  in erofs_xattr_iter_shared()
367 	for (i = 0; i < vi->xattr_shared_count; ++i) {  in erofs_xattr_iter_shared()
368 		it->pos = erofs_pos(sb, sbi->xattr_blkaddr) +  in erofs_xattr_iter_shared()
369 				vi->xattr_shared_xattrs[i] * sizeof(__le32);  in erofs_xattr_iter_shared()
370 		it->kaddr = erofs_bread(&it->buf, it->pos, EROFS_KMAP);  in erofs_xattr_iter_shared()
371 		if (IS_ERR(it->kaddr))  in erofs_xattr_iter_shared()
372 			return PTR_ERR(it->kaddr);  in erofs_xattr_iter_shared()
378 		if ((getxattr && ret != -ENOATTR) || (!getxattr && ret))  in erofs_xattr_iter_shared()
384 int erofs_getxattr(struct inode *inode, int index, const char *name,  in erofs_getxattr()  argument
391 	struct erofs_sb_info *sbi = EROFS_SB(inode->i_sb);  in erofs_getxattr()
393 	if (!name)  in erofs_getxattr()
394 		return -EINVAL;  in erofs_getxattr()
400 	/* reserved flag is non-zero if there's any change of on-disk format */  in erofs_getxattr()
401 	if (erofs_sb_has_xattr_filter(sbi) && !sbi->xattr_filter_reserved) {  in erofs_getxattr()
402 		hashbit = xxh32(name, strlen(name),  in erofs_getxattr()
404 		hashbit &= EROFS_XATTR_FILTER_BITS - 1;  in erofs_getxattr()
405 		if (vi->xattr_name_filter & (1U << hashbit))  in erofs_getxattr()
406 			return -ENOATTR;  in erofs_getxattr()
410 	it.name = QSTR(name);  in erofs_getxattr()
411 	if (it.name.len > EROFS_NAME_LEN)  in erofs_getxattr()
412 		return -ERANGE;  in erofs_getxattr()
414 	it.sb = inode->i_sb;  in erofs_getxattr()
422 	if (ret == -ENOATTR)  in erofs_getxattr()
435 	if (ret == -ENOATTR)  in erofs_listxattr()
440 	it.sb = dentry->d_sb;  in erofs_listxattr()
449 	if (!ret || ret == -ENOATTR)  in erofs_listxattr()
451 	if (ret == -ENOATTR)  in erofs_listxattr()
462 	if (sbi->xattr_prefixes) {  in erofs_xattr_prefixes_cleanup()
463 		for (i = 0; i < sbi->xattr_prefix_count; i++)  in erofs_xattr_prefixes_cleanup()
464 			kfree(sbi->xattr_prefixes[i].prefix);  in erofs_xattr_prefixes_cleanup()
465 		kfree(sbi->xattr_prefixes);  in erofs_xattr_prefixes_cleanup()
466 		sbi->xattr_prefixes = NULL;  in erofs_xattr_prefixes_cleanup()
474 	erofs_off_t pos = (erofs_off_t)sbi->xattr_prefix_start << 2;  in erofs_xattr_prefixes_init()
478 	if (!sbi->xattr_prefix_count)  in erofs_xattr_prefixes_init()
481 	pfs = kcalloc(sbi->xattr_prefix_count, sizeof(*pfs), GFP_KERNEL);  in erofs_xattr_prefixes_init()
483 		return -ENOMEM;  in erofs_xattr_prefixes_init()
485 	if (sbi->packed_inode)  in erofs_xattr_prefixes_init()
486 		buf.mapping = sbi->packed_inode->i_mapping;  in erofs_xattr_prefixes_init()
490 	for (i = 0; i < sbi->xattr_prefix_count; i++) {  in erofs_xattr_prefixes_init()
496 		} else if (len < sizeof(*pfs->prefix) ||  in erofs_xattr_prefixes_init()
497 			   len > EROFS_NAME_LEN + sizeof(*pfs->prefix)) {  in erofs_xattr_prefixes_init()
499 			ret = -EFSCORRUPTED;  in erofs_xattr_prefixes_init()
502 		pfs[i].prefix = ptr;  in erofs_xattr_prefixes_init()
503 		pfs[i].infix_len = len - sizeof(struct erofs_xattr_long_prefix);  in erofs_xattr_prefixes_init()
507 	sbi->xattr_prefixes = pfs;  in erofs_xattr_prefixes_init()
517 	int prefix, rc;  in erofs_get_acl()  local
521 		return ERR_PTR(-ECHILD);  in erofs_get_acl()
525 		prefix = EROFS_XATTR_INDEX_POSIX_ACL_ACCESS;  in erofs_get_acl()
528 		prefix = EROFS_XATTR_INDEX_POSIX_ACL_DEFAULT;  in erofs_get_acl()
531 		return ERR_PTR(-EINVAL);  in erofs_get_acl()
534 	rc = erofs_getxattr(inode, prefix, "", NULL, 0);  in erofs_get_acl()
538 			return ERR_PTR(-ENOMEM);  in erofs_get_acl()
539 		rc = erofs_getxattr(inode, prefix, "", value, rc);  in erofs_get_acl()
542 	if (rc == -ENOATTR)  in erofs_get_acl()