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@@ -0,0 +1,579 @@
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+// SPDX-License-Identifier: GPL-2.0
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+/*
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+ * linux/drivers/staging/erofs/xattr.c
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+ *
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+ * Copyright (C) 2017-2018 HUAWEI, Inc.
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+ * http://www.huawei.com/
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+ * Created by Gao Xiang <gaoxiang25@huawei.com>
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+ *
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+ * This file is subject to the terms and conditions of the GNU General Public
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+ * License. See the file COPYING in the main directory of the Linux
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+ * distribution for more details.
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+ */
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+#include <linux/security.h>
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+#include "xattr.h"
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+
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+struct xattr_iter {
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+ struct super_block *sb;
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+ struct page *page;
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+ void *kaddr;
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+
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+ erofs_blk_t blkaddr;
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+ unsigned ofs;
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+};
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+
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+static inline void xattr_iter_end(struct xattr_iter *it, bool atomic)
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+{
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+ /* only init_inode_xattrs use non-atomic once */
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+ if (unlikely(!atomic))
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+ kunmap(it->page);
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+ else
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+ kunmap_atomic(it->kaddr);
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+ unlock_page(it->page);
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+ put_page(it->page);
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+}
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+
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+static void init_inode_xattrs(struct inode *inode)
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+{
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+ struct xattr_iter it;
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+ unsigned i;
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+ struct erofs_xattr_ibody_header *ih;
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+ struct erofs_sb_info *sbi;
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+ struct erofs_vnode *vi;
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+ bool atomic_map;
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+
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+ if (likely(inode_has_inited_xattr(inode)))
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+ return;
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+
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+ vi = EROFS_V(inode);
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+ BUG_ON(!vi->xattr_isize);
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+
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+ sbi = EROFS_I_SB(inode);
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+ it.blkaddr = erofs_blknr(iloc(sbi, vi->nid) + vi->inode_isize);
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+ it.ofs = erofs_blkoff(iloc(sbi, vi->nid) + vi->inode_isize);
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+
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+ it.page = erofs_get_inline_page(inode, it.blkaddr);
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+ BUG_ON(IS_ERR(it.page));
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+
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+ /* read in shared xattr array (non-atomic, see kmalloc below) */
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+ it.kaddr = kmap(it.page);
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+ atomic_map = false;
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+
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+ ih = (struct erofs_xattr_ibody_header *)(it.kaddr + it.ofs);
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+
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+ vi->xattr_shared_count = ih->h_shared_count;
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+ vi->xattr_shared_xattrs = (unsigned *)kmalloc_array(
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+ vi->xattr_shared_count, sizeof(unsigned),
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+ GFP_KERNEL | __GFP_NOFAIL);
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+
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+ /* let's skip ibody header */
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+ it.ofs += sizeof(struct erofs_xattr_ibody_header);
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+
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+ for (i = 0; i < vi->xattr_shared_count; ++i) {
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+ if (unlikely(it.ofs >= EROFS_BLKSIZ)) {
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+ /* cannot be unaligned */
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+ BUG_ON(it.ofs != EROFS_BLKSIZ);
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+ xattr_iter_end(&it, atomic_map);
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+
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+ it.page = erofs_get_meta_page(inode->i_sb,
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+ ++it.blkaddr, S_ISDIR(inode->i_mode));
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+ BUG_ON(IS_ERR(it.page));
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+
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+ it.kaddr = kmap_atomic(it.page);
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+ atomic_map = true;
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+ it.ofs = 0;
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+ }
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+ vi->xattr_shared_xattrs[i] =
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+ le32_to_cpu(*(__le32 *)(it.kaddr + it.ofs));
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+ it.ofs += sizeof(__le32);
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+ }
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+ xattr_iter_end(&it, atomic_map);
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+
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+ inode_set_inited_xattr(inode);
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+}
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+
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+struct xattr_iter_handlers {
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+ int (*entry)(struct xattr_iter *, struct erofs_xattr_entry *);
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+ int (*name)(struct xattr_iter *, unsigned, char *, unsigned);
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+ int (*alloc_buffer)(struct xattr_iter *, unsigned);
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+ void (*value)(struct xattr_iter *, unsigned, char *, unsigned);
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+};
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+
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+static void xattr_iter_fixup(struct xattr_iter *it)
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+{
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+ if (unlikely(it->ofs >= EROFS_BLKSIZ)) {
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+ xattr_iter_end(it, true);
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+
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+ it->blkaddr += erofs_blknr(it->ofs);
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+ it->page = erofs_get_meta_page(it->sb, it->blkaddr, false);
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+ BUG_ON(IS_ERR(it->page));
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+
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+ it->kaddr = kmap_atomic(it->page);
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+ it->ofs = erofs_blkoff(it->ofs);
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+ }
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+}
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+
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+static int inline_xattr_iter_begin(struct xattr_iter *it,
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+ struct inode *inode)
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+{
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+ struct erofs_vnode *const vi = EROFS_V(inode);
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+ struct erofs_sb_info *const sbi = EROFS_SB(inode->i_sb);
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+ unsigned xattr_header_sz, inline_xattr_ofs;
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+
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+ xattr_header_sz = inlinexattr_header_size(inode);
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+ if (unlikely(xattr_header_sz >= vi->xattr_isize)) {
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+ BUG_ON(xattr_header_sz > vi->xattr_isize);
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+ return -ENOATTR;
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+ }
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+
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+ inline_xattr_ofs = vi->inode_isize + xattr_header_sz;
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+
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+ it->blkaddr = erofs_blknr(iloc(sbi, vi->nid) + inline_xattr_ofs);
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+ it->ofs = erofs_blkoff(iloc(sbi, vi->nid) + inline_xattr_ofs);
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+
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+ it->page = erofs_get_inline_page(inode, it->blkaddr);
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+ BUG_ON(IS_ERR(it->page));
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+ it->kaddr = kmap_atomic(it->page);
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+
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+ return vi->xattr_isize - xattr_header_sz;
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+}
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+
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+static int xattr_foreach(struct xattr_iter *it,
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+ struct xattr_iter_handlers *op, unsigned *tlimit)
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+{
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+ struct erofs_xattr_entry entry;
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+ unsigned value_sz, processed, slice;
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+ int err;
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+
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+ /* 0. fixup blkaddr, ofs, ipage */
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+ xattr_iter_fixup(it);
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+
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+ /*
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+ * 1. read xattr entry to the memory,
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+ * since we do EROFS_XATTR_ALIGN
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+ * therefore entry should be in the page
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+ */
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+ entry = *(struct erofs_xattr_entry *)(it->kaddr + it->ofs);
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+ if (tlimit != NULL) {
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+ unsigned entry_sz = EROFS_XATTR_ENTRY_SIZE(&entry);
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+
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+ BUG_ON(*tlimit < entry_sz);
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+ *tlimit -= entry_sz;
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+ }
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+
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+ it->ofs += sizeof(struct erofs_xattr_entry);
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+ value_sz = le16_to_cpu(entry.e_value_size);
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+
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+ /* handle entry */
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+ err = op->entry(it, &entry);
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+ if (err) {
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+ it->ofs += entry.e_name_len + value_sz;
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+ goto out;
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+ }
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+
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+ /* 2. handle xattr name (ofs will finally be at the end of name) */
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+ processed = 0;
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+
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+ while (processed < entry.e_name_len) {
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+ if (it->ofs >= EROFS_BLKSIZ) {
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+ BUG_ON(it->ofs > EROFS_BLKSIZ);
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+
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+ xattr_iter_fixup(it);
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+ it->ofs = 0;
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+ }
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+
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+ slice = min_t(unsigned, PAGE_SIZE - it->ofs,
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+ entry.e_name_len - processed);
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+
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+ /* handle name */
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+ err = op->name(it, processed, it->kaddr + it->ofs, slice);
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+ if (err) {
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+ it->ofs += entry.e_name_len - processed + value_sz;
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+ goto out;
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+ }
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+
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+ it->ofs += slice;
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+ processed += slice;
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+ }
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+
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+ /* 3. handle xattr value */
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+ processed = 0;
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+
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+ if (op->alloc_buffer != NULL) {
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+ err = op->alloc_buffer(it, value_sz);
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+ if (err) {
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+ it->ofs += value_sz;
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+ goto out;
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+ }
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+ }
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+
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+ while (processed < value_sz) {
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+ if (it->ofs >= EROFS_BLKSIZ) {
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+ BUG_ON(it->ofs > EROFS_BLKSIZ);
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+ xattr_iter_fixup(it);
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+ it->ofs = 0;
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+ }
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+
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+ slice = min_t(unsigned, PAGE_SIZE - it->ofs,
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+ value_sz - processed);
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+ op->value(it, processed, it->kaddr + it->ofs, slice);
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+ it->ofs += slice;
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+ processed += slice;
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+ }
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+
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+out:
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+ /* we assume that ofs is aligned with 4 bytes */
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+ it->ofs = EROFS_XATTR_ALIGN(it->ofs);
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+ return err;
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+}
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+
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+struct getxattr_iter {
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+ struct xattr_iter it;
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+
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+ char *buffer;
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+ int buffer_size, index;
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+ struct qstr name;
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+};
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+
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+static int xattr_entrymatch(struct xattr_iter *_it,
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+ struct erofs_xattr_entry *entry)
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+{
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+ struct getxattr_iter *it = container_of(_it, struct getxattr_iter, it);
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+
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+ return (it->index != entry->e_name_index ||
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+ it->name.len != entry->e_name_len) ? -ENOATTR : 0;
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+}
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+
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+static int xattr_namematch(struct xattr_iter *_it,
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+ unsigned processed, char *buf, unsigned len)
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+{
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+ struct getxattr_iter *it = container_of(_it, struct getxattr_iter, it);
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+
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+ return memcmp(buf, it->name.name + processed, len) ? -ENOATTR : 0;
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+}
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+
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+static int xattr_checkbuffer(struct xattr_iter *_it,
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+ unsigned value_sz)
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+{
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+ struct getxattr_iter *it = container_of(_it, struct getxattr_iter, it);
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+ int err = it->buffer_size < value_sz ? -ERANGE : 0;
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+
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+ it->buffer_size = value_sz;
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+ return it->buffer == NULL ? 1 : err;
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+}
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+
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+static void xattr_copyvalue(struct xattr_iter *_it,
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+ unsigned processed, char *buf, unsigned len)
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+{
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+ struct getxattr_iter *it = container_of(_it, struct getxattr_iter, it);
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+
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+ memcpy(it->buffer + processed, buf, len);
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+}
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+
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+static struct xattr_iter_handlers find_xattr_handlers = {
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+ .entry = xattr_entrymatch,
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+ .name = xattr_namematch,
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+ .alloc_buffer = xattr_checkbuffer,
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+ .value = xattr_copyvalue
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+};
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+
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+static int inline_getxattr(struct inode *inode, struct getxattr_iter *it)
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+{
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+ int ret;
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+ unsigned remaining;
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+
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+ ret = inline_xattr_iter_begin(&it->it, inode);
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+ if (ret < 0)
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+ return ret;
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+
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+ remaining = ret;
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+ while (remaining) {
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+ if ((ret = xattr_foreach(&it->it,
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+ &find_xattr_handlers, &remaining)) >= 0)
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+ break;
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+ }
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+ xattr_iter_end(&it->it, true);
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+
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+ return ret < 0 ? ret : it->buffer_size;
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+}
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+
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+static int shared_getxattr(struct inode *inode, struct getxattr_iter *it)
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+{
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+ struct erofs_vnode *const vi = EROFS_V(inode);
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+ struct erofs_sb_info *const sbi = EROFS_SB(inode->i_sb);
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+ unsigned i;
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+ int ret = -ENOATTR;
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+
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+ for (i = 0; i < vi->xattr_shared_count; ++i) {
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+ erofs_blk_t blkaddr =
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+ xattrblock_addr(sbi, vi->xattr_shared_xattrs[i]);
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+
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+ it->it.ofs = xattrblock_offset(sbi, vi->xattr_shared_xattrs[i]);
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+
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+ if (!i || blkaddr != it->it.blkaddr) {
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+ if (i)
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+ xattr_iter_end(&it->it, true);
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+
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+ it->it.page = erofs_get_meta_page(inode->i_sb,
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+ blkaddr, false);
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+ BUG_ON(IS_ERR(it->it.page));
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+ it->it.kaddr = kmap_atomic(it->it.page);
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+ it->it.blkaddr = blkaddr;
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+ }
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+
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+ if ((ret = xattr_foreach(&it->it,
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+ &find_xattr_handlers, NULL)) >= 0)
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+ break;
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+ }
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+ if (vi->xattr_shared_count)
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+ xattr_iter_end(&it->it, true);
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+
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+ return ret < 0 ? ret : it->buffer_size;
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+}
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+
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+static bool erofs_xattr_user_list(struct dentry *dentry)
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+{
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+ return test_opt(EROFS_SB(dentry->d_sb), XATTR_USER);
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+}
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+
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+static bool erofs_xattr_trusted_list(struct dentry *dentry)
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+{
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+ return capable(CAP_SYS_ADMIN);
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+}
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+
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+int erofs_getxattr(struct inode *inode, int index,
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+ const char *name,
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+ void *buffer, size_t buffer_size)
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+{
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+ int ret;
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+ struct getxattr_iter it;
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+
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+ if (unlikely(name == NULL))
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+ return -EINVAL;
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+
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+ init_inode_xattrs(inode);
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+
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+ it.index = index;
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+
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+ it.name.len = strlen(name);
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+ if (it.name.len > EROFS_NAME_LEN)
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+ return -ERANGE;
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+ it.name.name = name;
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+
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+ it.buffer = buffer;
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+ it.buffer_size = buffer_size;
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+
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+ it.it.sb = inode->i_sb;
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+ ret = inline_getxattr(inode, &it);
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+ if (ret == -ENOATTR)
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+ ret = shared_getxattr(inode, &it);
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+ return ret;
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+}
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+
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+static int erofs_xattr_generic_get(const struct xattr_handler *handler,
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+ struct dentry *unused, struct inode *inode,
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+ const char *name, void *buffer, size_t size)
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+{
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+ struct erofs_vnode *const vi = EROFS_V(inode);
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+ struct erofs_sb_info *const sbi = EROFS_I_SB(inode);
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+
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+ switch (handler->flags) {
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+ case EROFS_XATTR_INDEX_USER:
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+ if (!test_opt(sbi, XATTR_USER))
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+ return -EOPNOTSUPP;
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+ break;
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+ case EROFS_XATTR_INDEX_TRUSTED:
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+ if (!capable(CAP_SYS_ADMIN))
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+ return -EPERM;
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+ break;
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+ case EROFS_XATTR_INDEX_SECURITY:
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+ break;
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+ default:
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+ return -EINVAL;
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+ }
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+
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+ if (!vi->xattr_isize)
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+ return -ENOATTR;
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+
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+ return erofs_getxattr(inode, handler->flags, name, buffer, size);
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+}
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+
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+const struct xattr_handler erofs_xattr_user_handler = {
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+ .prefix = XATTR_USER_PREFIX,
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+ .flags = EROFS_XATTR_INDEX_USER,
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+ .list = erofs_xattr_user_list,
|
|
|
+ .get = erofs_xattr_generic_get,
|
|
|
+};
|
|
|
+
|
|
|
+const struct xattr_handler erofs_xattr_trusted_handler = {
|
|
|
+ .prefix = XATTR_TRUSTED_PREFIX,
|
|
|
+ .flags = EROFS_XATTR_INDEX_TRUSTED,
|
|
|
+ .list = erofs_xattr_trusted_list,
|
|
|
+ .get = erofs_xattr_generic_get,
|
|
|
+};
|
|
|
+
|
|
|
+#ifdef CONFIG_EROFS_FS_SECURITY
|
|
|
+const struct xattr_handler __maybe_unused erofs_xattr_security_handler = {
|
|
|
+ .prefix = XATTR_SECURITY_PREFIX,
|
|
|
+ .flags = EROFS_XATTR_INDEX_SECURITY,
|
|
|
+ .get = erofs_xattr_generic_get,
|
|
|
+};
|
|
|
+#endif
|
|
|
+
|
|
|
+#ifdef CONFIG_EROFS_FS_XATTR
|
|
|
+const struct xattr_handler *erofs_xattr_handlers[] = {
|
|
|
+ &erofs_xattr_user_handler,
|
|
|
+#ifdef CONFIG_EROFS_FS_POSIX_ACL
|
|
|
+ &posix_acl_access_xattr_handler,
|
|
|
+ &posix_acl_default_xattr_handler,
|
|
|
+#endif
|
|
|
+ &erofs_xattr_trusted_handler,
|
|
|
+#ifdef CONFIG_EROFS_FS_SECURITY
|
|
|
+ &erofs_xattr_security_handler,
|
|
|
+#endif
|
|
|
+ NULL,
|
|
|
+};
|
|
|
+#endif
|
|
|
+
|
|
|
+struct listxattr_iter {
|
|
|
+ struct xattr_iter it;
|
|
|
+
|
|
|
+ struct dentry *dentry;
|
|
|
+ char *buffer;
|
|
|
+ int buffer_size, buffer_ofs;
|
|
|
+};
|
|
|
+
|
|
|
+static int xattr_entrylist(struct xattr_iter *_it,
|
|
|
+ struct erofs_xattr_entry *entry)
|
|
|
+{
|
|
|
+ struct listxattr_iter *it =
|
|
|
+ container_of(_it, struct listxattr_iter, it);
|
|
|
+ unsigned prefix_len;
|
|
|
+ const char *prefix;
|
|
|
+
|
|
|
+ const struct xattr_handler *h =
|
|
|
+ erofs_xattr_handler(entry->e_name_index);
|
|
|
+
|
|
|
+ if (h == NULL || (h->list != NULL && !h->list(it->dentry)))
|
|
|
+ return 1;
|
|
|
+
|
|
|
+ /* Note that at least one of 'prefix' and 'name' should be non-NULL */
|
|
|
+ prefix = h->prefix != NULL ? h->prefix : h->name;
|
|
|
+ prefix_len = strlen(prefix);
|
|
|
+
|
|
|
+ if (it->buffer == NULL) {
|
|
|
+ it->buffer_ofs += prefix_len + entry->e_name_len + 1;
|
|
|
+ return 1;
|
|
|
+ }
|
|
|
+
|
|
|
+ if (it->buffer_ofs + prefix_len
|
|
|
+ + entry->e_name_len + 1 > it->buffer_size)
|
|
|
+ return -ERANGE;
|
|
|
+
|
|
|
+ memcpy(it->buffer + it->buffer_ofs, prefix, prefix_len);
|
|
|
+ it->buffer_ofs += prefix_len;
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+static int xattr_namelist(struct xattr_iter *_it,
|
|
|
+ unsigned processed, char *buf, unsigned len)
|
|
|
+{
|
|
|
+ struct listxattr_iter *it =
|
|
|
+ container_of(_it, struct listxattr_iter, it);
|
|
|
+
|
|
|
+ memcpy(it->buffer + it->buffer_ofs, buf, len);
|
|
|
+ it->buffer_ofs += len;
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+static int xattr_skipvalue(struct xattr_iter *_it,
|
|
|
+ unsigned value_sz)
|
|
|
+{
|
|
|
+ struct listxattr_iter *it =
|
|
|
+ container_of(_it, struct listxattr_iter, it);
|
|
|
+
|
|
|
+ it->buffer[it->buffer_ofs++] = '\0';
|
|
|
+ return 1;
|
|
|
+}
|
|
|
+
|
|
|
+static struct xattr_iter_handlers list_xattr_handlers = {
|
|
|
+ .entry = xattr_entrylist,
|
|
|
+ .name = xattr_namelist,
|
|
|
+ .alloc_buffer = xattr_skipvalue,
|
|
|
+ .value = NULL
|
|
|
+};
|
|
|
+
|
|
|
+static int inline_listxattr(struct listxattr_iter *it)
|
|
|
+{
|
|
|
+ int ret;
|
|
|
+ unsigned remaining;
|
|
|
+
|
|
|
+ ret = inline_xattr_iter_begin(&it->it, d_inode(it->dentry));
|
|
|
+ if (ret < 0)
|
|
|
+ return ret;
|
|
|
+
|
|
|
+ remaining = ret;
|
|
|
+ while (remaining) {
|
|
|
+ if ((ret = xattr_foreach(&it->it,
|
|
|
+ &list_xattr_handlers, &remaining)) < 0)
|
|
|
+ break;
|
|
|
+ }
|
|
|
+ xattr_iter_end(&it->it, true);
|
|
|
+ return ret < 0 ? ret : it->buffer_ofs;
|
|
|
+}
|
|
|
+
|
|
|
+static int shared_listxattr(struct listxattr_iter *it)
|
|
|
+{
|
|
|
+ struct inode *const inode = d_inode(it->dentry);
|
|
|
+ struct erofs_vnode *const vi = EROFS_V(inode);
|
|
|
+ struct erofs_sb_info *const sbi = EROFS_I_SB(inode);
|
|
|
+ unsigned i;
|
|
|
+ int ret = 0;
|
|
|
+
|
|
|
+ for (i = 0; i < vi->xattr_shared_count; ++i) {
|
|
|
+ erofs_blk_t blkaddr =
|
|
|
+ xattrblock_addr(sbi, vi->xattr_shared_xattrs[i]);
|
|
|
+
|
|
|
+ it->it.ofs = xattrblock_offset(sbi, vi->xattr_shared_xattrs[i]);
|
|
|
+ if (!i || blkaddr != it->it.blkaddr) {
|
|
|
+ if (i)
|
|
|
+ xattr_iter_end(&it->it, true);
|
|
|
+
|
|
|
+ it->it.page = erofs_get_meta_page(inode->i_sb,
|
|
|
+ blkaddr, false);
|
|
|
+ BUG_ON(IS_ERR(it->it.page));
|
|
|
+ it->it.kaddr = kmap_atomic(it->it.page);
|
|
|
+ it->it.blkaddr = blkaddr;
|
|
|
+ }
|
|
|
+
|
|
|
+ if ((ret = xattr_foreach(&it->it,
|
|
|
+ &list_xattr_handlers, NULL)) < 0)
|
|
|
+ break;
|
|
|
+ }
|
|
|
+ if (vi->xattr_shared_count)
|
|
|
+ xattr_iter_end(&it->it, true);
|
|
|
+
|
|
|
+ return ret < 0 ? ret : it->buffer_ofs;
|
|
|
+}
|
|
|
+
|
|
|
+ssize_t erofs_listxattr(struct dentry *dentry,
|
|
|
+ char *buffer, size_t buffer_size)
|
|
|
+{
|
|
|
+ int ret;
|
|
|
+ struct listxattr_iter it;
|
|
|
+
|
|
|
+ init_inode_xattrs(d_inode(dentry));
|
|
|
+
|
|
|
+ it.dentry = dentry;
|
|
|
+ it.buffer = buffer;
|
|
|
+ it.buffer_size = buffer_size;
|
|
|
+ it.buffer_ofs = 0;
|
|
|
+
|
|
|
+ it.it.sb = dentry->d_sb;
|
|
|
+
|
|
|
+ ret = inline_listxattr(&it);
|
|
|
+ if (ret < 0 && ret != -ENOATTR)
|
|
|
+ return ret;
|
|
|
+ return shared_listxattr(&it);
|
|
|
+}
|
|
|
+
|
Gao Xiang