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![Jingbo Xu](/assets/img/avatar_default.png)
Fragments and dedupe share one feature bit, and thus packed inode may not exist when fragment feature bit (dedupe feature bit exactly) is set, e.g. when deduplication feature is in use while fragments feature is not. In this case, sbi->packed_inode could be NULL while fragments feature bit is set. Fix this by accessing packed inode only when it exists. Reported-by: syzbot+902d5a9373ae8f748a94@syzkaller.appspotmail.com Link: https://syzkaller.appspot.com/bug?extid=902d5a9373ae8f748a94 Reported-and-tested-by: syzbot+bbb353775d51424087f2@syzkaller.appspotmail.com Fixes:9e38291461
("erofs: add helpers to load long xattr name prefixes") Fixes:6a318ccd7e
("erofs: enable long extended attribute name prefixes") Signed-off-by: Jingbo Xu <jefflexu@linux.alibaba.com> Reviewed-by: Yue Hu <huyue2@coolpad.com> Reviewed-by: Chao Yu <chao@kernel.org> Link: https://lore.kernel.org/r/20230515103941.129784-1-jefflexu@linux.alibaba.com Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>
744 lines
19 KiB
C
744 lines
19 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (C) 2017-2018 HUAWEI, Inc.
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* https://www.huawei.com/
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* Copyright (C) 2021-2022, Alibaba Cloud
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*/
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#include <linux/security.h>
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#include "xattr.h"
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static inline erofs_blk_t erofs_xattr_blkaddr(struct super_block *sb,
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unsigned int xattr_id)
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{
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return EROFS_SB(sb)->xattr_blkaddr +
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erofs_blknr(sb, xattr_id * sizeof(__u32));
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}
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static inline unsigned int erofs_xattr_blkoff(struct super_block *sb,
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unsigned int xattr_id)
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{
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return erofs_blkoff(sb, xattr_id * sizeof(__u32));
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}
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struct xattr_iter {
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struct super_block *sb;
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struct erofs_buf buf;
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void *kaddr;
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erofs_blk_t blkaddr;
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unsigned int ofs;
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};
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static int erofs_init_inode_xattrs(struct inode *inode)
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{
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struct erofs_inode *const vi = EROFS_I(inode);
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struct xattr_iter it;
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unsigned int i;
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struct erofs_xattr_ibody_header *ih;
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struct super_block *sb = inode->i_sb;
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int ret = 0;
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/* the most case is that xattrs of this inode are initialized. */
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if (test_bit(EROFS_I_EA_INITED_BIT, &vi->flags)) {
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/*
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* paired with smp_mb() at the end of the function to ensure
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* fields will only be observed after the bit is set.
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*/
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smp_mb();
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return 0;
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}
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if (wait_on_bit_lock(&vi->flags, EROFS_I_BL_XATTR_BIT, TASK_KILLABLE))
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return -ERESTARTSYS;
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/* someone has initialized xattrs for us? */
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if (test_bit(EROFS_I_EA_INITED_BIT, &vi->flags))
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goto out_unlock;
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/*
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* bypass all xattr operations if ->xattr_isize is not greater than
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* sizeof(struct erofs_xattr_ibody_header), in detail:
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* 1) it is not enough to contain erofs_xattr_ibody_header then
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* ->xattr_isize should be 0 (it means no xattr);
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* 2) it is just to contain erofs_xattr_ibody_header, which is on-disk
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* undefined right now (maybe use later with some new sb feature).
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*/
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if (vi->xattr_isize == sizeof(struct erofs_xattr_ibody_header)) {
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erofs_err(sb,
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"xattr_isize %d of nid %llu is not supported yet",
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vi->xattr_isize, vi->nid);
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ret = -EOPNOTSUPP;
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goto out_unlock;
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} else if (vi->xattr_isize < sizeof(struct erofs_xattr_ibody_header)) {
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if (vi->xattr_isize) {
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erofs_err(sb, "bogus xattr ibody @ nid %llu", vi->nid);
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DBG_BUGON(1);
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ret = -EFSCORRUPTED;
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goto out_unlock; /* xattr ondisk layout error */
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}
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ret = -ENOATTR;
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goto out_unlock;
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}
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it.buf = __EROFS_BUF_INITIALIZER;
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it.blkaddr = erofs_blknr(sb, erofs_iloc(inode) + vi->inode_isize);
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it.ofs = erofs_blkoff(sb, erofs_iloc(inode) + vi->inode_isize);
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/* read in shared xattr array (non-atomic, see kmalloc below) */
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it.kaddr = erofs_read_metabuf(&it.buf, sb, it.blkaddr, EROFS_KMAP);
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if (IS_ERR(it.kaddr)) {
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ret = PTR_ERR(it.kaddr);
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goto out_unlock;
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}
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ih = (struct erofs_xattr_ibody_header *)(it.kaddr + it.ofs);
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vi->xattr_shared_count = ih->h_shared_count;
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vi->xattr_shared_xattrs = kmalloc_array(vi->xattr_shared_count,
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sizeof(uint), GFP_KERNEL);
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if (!vi->xattr_shared_xattrs) {
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erofs_put_metabuf(&it.buf);
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ret = -ENOMEM;
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goto out_unlock;
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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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for (i = 0; i < vi->xattr_shared_count; ++i) {
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if (it.ofs >= sb->s_blocksize) {
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/* cannot be unaligned */
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DBG_BUGON(it.ofs != sb->s_blocksize);
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it.kaddr = erofs_read_metabuf(&it.buf, sb, ++it.blkaddr,
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EROFS_KMAP);
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if (IS_ERR(it.kaddr)) {
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kfree(vi->xattr_shared_xattrs);
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vi->xattr_shared_xattrs = NULL;
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ret = PTR_ERR(it.kaddr);
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goto out_unlock;
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}
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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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erofs_put_metabuf(&it.buf);
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/* paired with smp_mb() at the beginning of the function. */
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smp_mb();
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set_bit(EROFS_I_EA_INITED_BIT, &vi->flags);
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out_unlock:
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clear_and_wake_up_bit(EROFS_I_BL_XATTR_BIT, &vi->flags);
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return ret;
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}
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/*
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* the general idea for these return values is
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* if 0 is returned, go on processing the current xattr;
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* 1 (> 0) is returned, skip this round to process the next xattr;
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* -err (< 0) is returned, an error (maybe ENOXATTR) occurred
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* and need to be handled
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*/
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struct xattr_iter_handlers {
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int (*entry)(struct xattr_iter *_it, struct erofs_xattr_entry *entry);
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int (*name)(struct xattr_iter *_it, unsigned int processed, char *buf,
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unsigned int len);
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int (*alloc_buffer)(struct xattr_iter *_it, unsigned int value_sz);
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void (*value)(struct xattr_iter *_it, unsigned int processed, char *buf,
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unsigned int len);
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};
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static inline int xattr_iter_fixup(struct xattr_iter *it)
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{
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if (it->ofs < it->sb->s_blocksize)
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return 0;
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it->blkaddr += erofs_blknr(it->sb, it->ofs);
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it->kaddr = erofs_read_metabuf(&it->buf, it->sb, it->blkaddr,
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EROFS_KMAP);
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if (IS_ERR(it->kaddr))
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return PTR_ERR(it->kaddr);
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it->ofs = erofs_blkoff(it->sb, it->ofs);
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return 0;
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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_inode *const vi = EROFS_I(inode);
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unsigned int xattr_header_sz, inline_xattr_ofs;
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xattr_header_sz = sizeof(struct erofs_xattr_ibody_header) +
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sizeof(u32) * vi->xattr_shared_count;
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if (xattr_header_sz >= vi->xattr_isize) {
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DBG_BUGON(xattr_header_sz > vi->xattr_isize);
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return -ENOATTR;
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}
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inline_xattr_ofs = vi->inode_isize + xattr_header_sz;
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it->blkaddr = erofs_blknr(it->sb, erofs_iloc(inode) + inline_xattr_ofs);
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it->ofs = erofs_blkoff(it->sb, erofs_iloc(inode) + inline_xattr_ofs);
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it->kaddr = erofs_read_metabuf(&it->buf, inode->i_sb, it->blkaddr,
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EROFS_KMAP);
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if (IS_ERR(it->kaddr))
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return PTR_ERR(it->kaddr);
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return vi->xattr_isize - xattr_header_sz;
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}
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/*
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* Regardless of success or failure, `xattr_foreach' will end up with
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* `ofs' pointing to the next xattr item rather than an arbitrary position.
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*/
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static int xattr_foreach(struct xattr_iter *it,
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const struct xattr_iter_handlers *op,
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unsigned int *tlimit)
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{
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struct erofs_xattr_entry entry;
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unsigned int value_sz, processed, slice;
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int err;
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/* 0. fixup blkaddr, ofs, ipage */
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err = xattr_iter_fixup(it);
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if (err)
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return err;
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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) {
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unsigned int entry_sz = erofs_xattr_entry_size(&entry);
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/* xattr on-disk corruption: xattr entry beyond xattr_isize */
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if (*tlimit < entry_sz) {
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DBG_BUGON(1);
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return -EFSCORRUPTED;
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}
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*tlimit -= entry_sz;
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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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/* 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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/* 2. handle xattr name (ofs will finally be at the end of name) */
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processed = 0;
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while (processed < entry.e_name_len) {
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if (it->ofs >= it->sb->s_blocksize) {
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DBG_BUGON(it->ofs > it->sb->s_blocksize);
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err = xattr_iter_fixup(it);
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if (err)
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goto out;
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it->ofs = 0;
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}
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slice = min_t(unsigned int, it->sb->s_blocksize - it->ofs,
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entry.e_name_len - processed);
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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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it->ofs += slice;
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processed += slice;
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}
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/* 3. handle xattr value */
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processed = 0;
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if (op->alloc_buffer) {
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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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while (processed < value_sz) {
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if (it->ofs >= it->sb->s_blocksize) {
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DBG_BUGON(it->ofs > it->sb->s_blocksize);
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err = xattr_iter_fixup(it);
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if (err)
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goto out;
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it->ofs = 0;
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}
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slice = min_t(unsigned int, it->sb->s_blocksize - 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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out:
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/* xattrs should be 4-byte aligned (on-disk constraint) */
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it->ofs = EROFS_XATTR_ALIGN(it->ofs);
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return err < 0 ? err : 0;
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}
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struct getxattr_iter {
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struct xattr_iter it;
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char *buffer;
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int buffer_size, index, infix_len;
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struct qstr name;
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};
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static int erofs_xattr_long_entrymatch(struct getxattr_iter *it,
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struct erofs_xattr_entry *entry)
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{
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struct erofs_sb_info *sbi = EROFS_SB(it->it.sb);
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struct erofs_xattr_prefix_item *pf = sbi->xattr_prefixes +
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(entry->e_name_index & EROFS_XATTR_LONG_PREFIX_MASK);
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if (pf >= sbi->xattr_prefixes + sbi->xattr_prefix_count)
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return -ENOATTR;
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if (it->index != pf->prefix->base_index ||
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it->name.len != entry->e_name_len + pf->infix_len)
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return -ENOATTR;
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if (memcmp(it->name.name, pf->prefix->infix, pf->infix_len))
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return -ENOATTR;
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it->infix_len = pf->infix_len;
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return 0;
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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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/* should also match the infix for long name prefixes */
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if (entry->e_name_index & EROFS_XATTR_LONG_PREFIX)
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return erofs_xattr_long_entrymatch(it, entry);
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if (it->index != entry->e_name_index ||
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it->name.len != entry->e_name_len)
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return -ENOATTR;
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it->infix_len = 0;
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return 0;
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}
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static int xattr_namematch(struct xattr_iter *_it,
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unsigned int processed, char *buf, unsigned int len)
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{
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struct getxattr_iter *it = container_of(_it, struct getxattr_iter, it);
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if (memcmp(buf, it->name.name + it->infix_len + processed, len))
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return -ENOATTR;
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return 0;
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}
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static int xattr_checkbuffer(struct xattr_iter *_it,
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unsigned int 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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it->buffer_size = value_sz;
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return !it->buffer ? 1 : err;
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}
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static void xattr_copyvalue(struct xattr_iter *_it,
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unsigned int processed,
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char *buf, unsigned int len)
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{
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struct getxattr_iter *it = container_of(_it, struct getxattr_iter, it);
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memcpy(it->buffer + processed, buf, len);
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}
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static const 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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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 int remaining;
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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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remaining = ret;
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while (remaining) {
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ret = xattr_foreach(&it->it, &find_xattr_handlers, &remaining);
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if (ret != -ENOATTR)
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break;
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}
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return ret ? ret : it->buffer_size;
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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_inode *const vi = EROFS_I(inode);
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struct super_block *const sb = it->it.sb;
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unsigned int i, xsid;
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int ret = -ENOATTR;
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for (i = 0; i < vi->xattr_shared_count; ++i) {
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xsid = vi->xattr_shared_xattrs[i];
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it->it.blkaddr = erofs_xattr_blkaddr(sb, xsid);
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it->it.ofs = erofs_xattr_blkoff(sb, xsid);
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it->it.kaddr = erofs_read_metabuf(&it->it.buf, sb,
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it->it.blkaddr, EROFS_KMAP);
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if (IS_ERR(it->it.kaddr))
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return PTR_ERR(it->it.kaddr);
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ret = xattr_foreach(&it->it, &find_xattr_handlers, NULL);
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if (ret != -ENOATTR)
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break;
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}
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return ret ? ret : it->buffer_size;
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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)->opt, XATTR_USER);
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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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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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if (!name)
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return -EINVAL;
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ret = erofs_init_inode_xattrs(inode);
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if (ret)
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return ret;
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it.index = index;
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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.it.buf = __EROFS_BUF_INITIALIZER;
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it.name.name = name;
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it.buffer = buffer;
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it.buffer_size = buffer_size;
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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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erofs_put_metabuf(&it.it.buf);
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return ret;
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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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if (handler->flags == EROFS_XATTR_INDEX_USER &&
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!test_opt(&EROFS_I_SB(inode)->opt, XATTR_USER))
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return -EOPNOTSUPP;
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return erofs_getxattr(inode, handler->flags, name, buffer, size);
|
|
}
|
|
|
|
const struct xattr_handler erofs_xattr_user_handler = {
|
|
.prefix = XATTR_USER_PREFIX,
|
|
.flags = EROFS_XATTR_INDEX_USER,
|
|
.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
|
|
|
|
const struct xattr_handler *erofs_xattr_handlers[] = {
|
|
&erofs_xattr_user_handler,
|
|
&erofs_xattr_trusted_handler,
|
|
#ifdef CONFIG_EROFS_FS_SECURITY
|
|
&erofs_xattr_security_handler,
|
|
#endif
|
|
NULL,
|
|
};
|
|
|
|
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 int base_index = entry->e_name_index;
|
|
unsigned int prefix_len, infix_len = 0;
|
|
const char *prefix, *infix = NULL;
|
|
|
|
if (entry->e_name_index & EROFS_XATTR_LONG_PREFIX) {
|
|
struct erofs_sb_info *sbi = EROFS_SB(_it->sb);
|
|
struct erofs_xattr_prefix_item *pf = sbi->xattr_prefixes +
|
|
(entry->e_name_index & EROFS_XATTR_LONG_PREFIX_MASK);
|
|
|
|
if (pf >= sbi->xattr_prefixes + sbi->xattr_prefix_count)
|
|
return 1;
|
|
infix = pf->prefix->infix;
|
|
infix_len = pf->infix_len;
|
|
base_index = pf->prefix->base_index;
|
|
}
|
|
|
|
prefix = erofs_xattr_prefix(base_index, it->dentry);
|
|
if (!prefix)
|
|
return 1;
|
|
prefix_len = strlen(prefix);
|
|
|
|
if (!it->buffer) {
|
|
it->buffer_ofs += prefix_len + infix_len +
|
|
entry->e_name_len + 1;
|
|
return 1;
|
|
}
|
|
|
|
if (it->buffer_ofs + prefix_len + infix_len +
|
|
+ entry->e_name_len + 1 > it->buffer_size)
|
|
return -ERANGE;
|
|
|
|
memcpy(it->buffer + it->buffer_ofs, prefix, prefix_len);
|
|
memcpy(it->buffer + it->buffer_ofs + prefix_len, infix, infix_len);
|
|
it->buffer_ofs += prefix_len + infix_len;
|
|
return 0;
|
|
}
|
|
|
|
static int xattr_namelist(struct xattr_iter *_it,
|
|
unsigned int processed, char *buf, unsigned int 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 int value_sz)
|
|
{
|
|
struct listxattr_iter *it =
|
|
container_of(_it, struct listxattr_iter, it);
|
|
|
|
it->buffer[it->buffer_ofs++] = '\0';
|
|
return 1;
|
|
}
|
|
|
|
static const 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 int remaining;
|
|
|
|
ret = inline_xattr_iter_begin(&it->it, d_inode(it->dentry));
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
remaining = ret;
|
|
while (remaining) {
|
|
ret = xattr_foreach(&it->it, &list_xattr_handlers, &remaining);
|
|
if (ret)
|
|
break;
|
|
}
|
|
return ret ? ret : it->buffer_ofs;
|
|
}
|
|
|
|
static int shared_listxattr(struct listxattr_iter *it)
|
|
{
|
|
struct inode *const inode = d_inode(it->dentry);
|
|
struct erofs_inode *const vi = EROFS_I(inode);
|
|
struct super_block *const sb = it->it.sb;
|
|
unsigned int i, xsid;
|
|
int ret = 0;
|
|
|
|
for (i = 0; i < vi->xattr_shared_count; ++i) {
|
|
xsid = vi->xattr_shared_xattrs[i];
|
|
it->it.blkaddr = erofs_xattr_blkaddr(sb, xsid);
|
|
it->it.ofs = erofs_xattr_blkoff(sb, xsid);
|
|
it->it.kaddr = erofs_read_metabuf(&it->it.buf, sb,
|
|
it->it.blkaddr, EROFS_KMAP);
|
|
if (IS_ERR(it->it.kaddr))
|
|
return PTR_ERR(it->it.kaddr);
|
|
|
|
ret = xattr_foreach(&it->it, &list_xattr_handlers, NULL);
|
|
if (ret)
|
|
break;
|
|
}
|
|
return ret ? ret : it->buffer_ofs;
|
|
}
|
|
|
|
ssize_t erofs_listxattr(struct dentry *dentry,
|
|
char *buffer, size_t buffer_size)
|
|
{
|
|
int ret;
|
|
struct listxattr_iter it;
|
|
|
|
ret = erofs_init_inode_xattrs(d_inode(dentry));
|
|
if (ret == -ENOATTR)
|
|
return 0;
|
|
if (ret)
|
|
return ret;
|
|
|
|
it.it.buf = __EROFS_BUF_INITIALIZER;
|
|
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)
|
|
ret = shared_listxattr(&it);
|
|
erofs_put_metabuf(&it.it.buf);
|
|
return ret;
|
|
}
|
|
|
|
void erofs_xattr_prefixes_cleanup(struct super_block *sb)
|
|
{
|
|
struct erofs_sb_info *sbi = EROFS_SB(sb);
|
|
int i;
|
|
|
|
if (sbi->xattr_prefixes) {
|
|
for (i = 0; i < sbi->xattr_prefix_count; i++)
|
|
kfree(sbi->xattr_prefixes[i].prefix);
|
|
kfree(sbi->xattr_prefixes);
|
|
sbi->xattr_prefixes = NULL;
|
|
}
|
|
}
|
|
|
|
int erofs_xattr_prefixes_init(struct super_block *sb)
|
|
{
|
|
struct erofs_sb_info *sbi = EROFS_SB(sb);
|
|
struct erofs_buf buf = __EROFS_BUF_INITIALIZER;
|
|
erofs_off_t pos = (erofs_off_t)sbi->xattr_prefix_start << 2;
|
|
struct erofs_xattr_prefix_item *pfs;
|
|
int ret = 0, i, len;
|
|
|
|
if (!sbi->xattr_prefix_count)
|
|
return 0;
|
|
|
|
pfs = kzalloc(sbi->xattr_prefix_count * sizeof(*pfs), GFP_KERNEL);
|
|
if (!pfs)
|
|
return -ENOMEM;
|
|
|
|
if (sbi->packed_inode)
|
|
buf.inode = sbi->packed_inode;
|
|
else
|
|
erofs_init_metabuf(&buf, sb);
|
|
|
|
for (i = 0; i < sbi->xattr_prefix_count; i++) {
|
|
void *ptr = erofs_read_metadata(sb, &buf, &pos, &len);
|
|
|
|
if (IS_ERR(ptr)) {
|
|
ret = PTR_ERR(ptr);
|
|
break;
|
|
} else if (len < sizeof(*pfs->prefix) ||
|
|
len > EROFS_NAME_LEN + sizeof(*pfs->prefix)) {
|
|
kfree(ptr);
|
|
ret = -EFSCORRUPTED;
|
|
break;
|
|
}
|
|
pfs[i].prefix = ptr;
|
|
pfs[i].infix_len = len - sizeof(struct erofs_xattr_long_prefix);
|
|
}
|
|
|
|
erofs_put_metabuf(&buf);
|
|
sbi->xattr_prefixes = pfs;
|
|
if (ret)
|
|
erofs_xattr_prefixes_cleanup(sb);
|
|
return ret;
|
|
}
|
|
|
|
#ifdef CONFIG_EROFS_FS_POSIX_ACL
|
|
struct posix_acl *erofs_get_acl(struct inode *inode, int type, bool rcu)
|
|
{
|
|
struct posix_acl *acl;
|
|
int prefix, rc;
|
|
char *value = NULL;
|
|
|
|
if (rcu)
|
|
return ERR_PTR(-ECHILD);
|
|
|
|
switch (type) {
|
|
case ACL_TYPE_ACCESS:
|
|
prefix = EROFS_XATTR_INDEX_POSIX_ACL_ACCESS;
|
|
break;
|
|
case ACL_TYPE_DEFAULT:
|
|
prefix = EROFS_XATTR_INDEX_POSIX_ACL_DEFAULT;
|
|
break;
|
|
default:
|
|
return ERR_PTR(-EINVAL);
|
|
}
|
|
|
|
rc = erofs_getxattr(inode, prefix, "", NULL, 0);
|
|
if (rc > 0) {
|
|
value = kmalloc(rc, GFP_KERNEL);
|
|
if (!value)
|
|
return ERR_PTR(-ENOMEM);
|
|
rc = erofs_getxattr(inode, prefix, "", value, rc);
|
|
}
|
|
|
|
if (rc == -ENOATTR)
|
|
acl = NULL;
|
|
else if (rc < 0)
|
|
acl = ERR_PTR(rc);
|
|
else
|
|
acl = posix_acl_from_xattr(&init_user_ns, value, rc);
|
|
kfree(value);
|
|
return acl;
|
|
}
|
|
#endif
|