655 lines
16 KiB
C
655 lines
16 KiB
C
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// 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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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 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(erofs_iloc(inode) + vi->inode_isize);
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it.ofs = erofs_blkoff(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 >= EROFS_BLKSIZ) {
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/* cannot be unaligned */
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DBG_BUGON(it.ofs != EROFS_BLKSIZ);
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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 < EROFS_BLKSIZ)
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return 0;
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it->blkaddr += erofs_blknr(it->ofs);
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it->kaddr = erofs_read_metabuf(&it->buf, it->sb, it->blkaddr,
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EROFS_KMAP_ATOMIC);
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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->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 = inlinexattr_header_size(inode);
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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(erofs_iloc(inode) + inline_xattr_ofs);
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it->ofs = erofs_blkoff(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_ATOMIC);
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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 >= EROFS_BLKSIZ) {
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DBG_BUGON(it->ofs > EROFS_BLKSIZ);
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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, EROFS_BLKSIZ - 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 >= EROFS_BLKSIZ) {
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DBG_BUGON(it->ofs > EROFS_BLKSIZ);
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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, EROFS_BLKSIZ - 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;
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struct qstr name;
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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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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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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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return memcmp(buf, it->name.name + processed, len) ? -ENOATTR : 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 = inode->i_sb;
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struct erofs_sb_info *const sbi = EROFS_SB(sb);
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unsigned int i;
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int ret = -ENOATTR;
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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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it->it.ofs = xattrblock_offset(sbi, vi->xattr_shared_xattrs[i]);
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it->it.kaddr = erofs_read_metabuf(&it->it.buf, sb, blkaddr,
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EROFS_KMAP_ATOMIC);
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if (IS_ERR(it->it.kaddr))
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return PTR_ERR(it->it.kaddr);
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it->it.blkaddr = blkaddr;
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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 = 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,
|
||
|
const char *name, void *buffer, size_t size)
|
||
|
{
|
||
|
struct erofs_sb_info *const sbi = EROFS_I_SB(inode);
|
||
|
|
||
|
switch (handler->flags) {
|
||
|
case EROFS_XATTR_INDEX_USER:
|
||
|
if (!test_opt(&sbi->opt, XATTR_USER))
|
||
|
return -EOPNOTSUPP;
|
||
|
break;
|
||
|
case EROFS_XATTR_INDEX_TRUSTED:
|
||
|
break;
|
||
|
case EROFS_XATTR_INDEX_SECURITY:
|
||
|
break;
|
||
|
default:
|
||
|
return -EINVAL;
|
||
|
}
|
||
|
|
||
|
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,
|
||
|
#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,
|
||
|
};
|
||
|
|
||
|
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 prefix_len;
|
||
|
const char *prefix;
|
||
|
|
||
|
const struct xattr_handler *h =
|
||
|
erofs_xattr_handler(entry->e_name_index);
|
||
|
|
||
|
if (!h || (h->list && !h->list(it->dentry)))
|
||
|
return 1;
|
||
|
|
||
|
prefix = xattr_prefix(h);
|
||
|
prefix_len = strlen(prefix);
|
||
|
|
||
|
if (!it->buffer) {
|
||
|
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 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 = inode->i_sb;
|
||
|
struct erofs_sb_info *const sbi = EROFS_SB(sb);
|
||
|
unsigned int 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]);
|
||
|
it->it.kaddr = erofs_read_metabuf(&it->it.buf, sb, blkaddr,
|
||
|
EROFS_KMAP_ATOMIC);
|
||
|
if (IS_ERR(it->it.kaddr))
|
||
|
return PTR_ERR(it->it.kaddr);
|
||
|
it->it.blkaddr = blkaddr;
|
||
|
|
||
|
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 = 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;
|
||
|
}
|
||
|
|
||
|
#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
|