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025497e1d1
Negative i_size is never supported, although crafted images with inodes having negative i_size will NOT lead to security issues in our current codebase: The following image can verify this (gzip+base64 encoded): H4sICCmk4mYAA3Rlc3QuaW1nAGNgGAWjYBSMVPDo4dcH3jP2aTED2TwMKgxMUHHNJY/SQDQX LxcDIw3tZwXit44MDNpQ/n8gQJZ/vxjijosPuSyZ0DUDgQqcZoKzVYFsDShbHeh6PT29ktTi Eqz2g/y2pBFiLxDMh4lhs5+W4TAKRsEoGAWjYBSMglEwCkYBPQAAS2DbowAQAAA= Mark as bad inodes for such corrupted inodes explicitly. Reviewed-by: Chao Yu <chao@kernel.org> Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com> Link: https://lore.kernel.org/r/20240912083538.3011860-1-hsiangkao@linux.alibaba.com
368 lines
9.9 KiB
C
368 lines
9.9 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, Alibaba Cloud
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*/
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#include "xattr.h"
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#include <trace/events/erofs.h>
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static int erofs_fill_symlink(struct inode *inode, void *kaddr,
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unsigned int m_pofs)
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{
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struct erofs_inode *vi = EROFS_I(inode);
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loff_t off;
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m_pofs += vi->xattr_isize;
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/* check if it cannot be handled with fast symlink scheme */
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if (vi->datalayout != EROFS_INODE_FLAT_INLINE ||
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check_add_overflow(m_pofs, inode->i_size, &off) ||
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off > i_blocksize(inode))
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return 0;
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inode->i_link = kmemdup_nul(kaddr + m_pofs, inode->i_size, GFP_KERNEL);
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return inode->i_link ? 0 : -ENOMEM;
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}
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static int erofs_read_inode(struct inode *inode)
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{
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struct super_block *sb = inode->i_sb;
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struct erofs_sb_info *sbi = EROFS_SB(sb);
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struct erofs_inode *vi = EROFS_I(inode);
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const erofs_off_t inode_loc = erofs_iloc(inode);
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erofs_blk_t blkaddr, nblks = 0;
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void *kaddr;
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struct erofs_inode_compact *dic;
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struct erofs_inode_extended *die, *copied = NULL;
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union erofs_inode_i_u iu;
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struct erofs_buf buf = __EROFS_BUF_INITIALIZER;
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unsigned int ifmt, ofs;
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int err = 0;
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blkaddr = erofs_blknr(sb, inode_loc);
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ofs = erofs_blkoff(sb, inode_loc);
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kaddr = erofs_read_metabuf(&buf, sb, erofs_pos(sb, blkaddr), EROFS_KMAP);
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if (IS_ERR(kaddr)) {
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erofs_err(sb, "failed to get inode (nid: %llu) page, err %ld",
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vi->nid, PTR_ERR(kaddr));
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return PTR_ERR(kaddr);
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}
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dic = kaddr + ofs;
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ifmt = le16_to_cpu(dic->i_format);
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if (ifmt & ~EROFS_I_ALL) {
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erofs_err(sb, "unsupported i_format %u of nid %llu",
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ifmt, vi->nid);
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err = -EOPNOTSUPP;
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goto err_out;
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}
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vi->datalayout = erofs_inode_datalayout(ifmt);
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if (vi->datalayout >= EROFS_INODE_DATALAYOUT_MAX) {
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erofs_err(sb, "unsupported datalayout %u of nid %llu",
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vi->datalayout, vi->nid);
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err = -EOPNOTSUPP;
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goto err_out;
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}
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switch (erofs_inode_version(ifmt)) {
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case EROFS_INODE_LAYOUT_EXTENDED:
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vi->inode_isize = sizeof(struct erofs_inode_extended);
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/* check if the extended inode acrosses block boundary */
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if (ofs + vi->inode_isize <= sb->s_blocksize) {
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ofs += vi->inode_isize;
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die = (struct erofs_inode_extended *)dic;
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} else {
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const unsigned int gotten = sb->s_blocksize - ofs;
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copied = kmalloc(vi->inode_isize, GFP_KERNEL);
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if (!copied) {
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err = -ENOMEM;
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goto err_out;
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}
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memcpy(copied, dic, gotten);
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kaddr = erofs_read_metabuf(&buf, sb, erofs_pos(sb, blkaddr + 1),
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EROFS_KMAP);
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if (IS_ERR(kaddr)) {
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erofs_err(sb, "failed to get inode payload block (nid: %llu), err %ld",
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vi->nid, PTR_ERR(kaddr));
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kfree(copied);
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return PTR_ERR(kaddr);
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}
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ofs = vi->inode_isize - gotten;
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memcpy((u8 *)copied + gotten, kaddr, ofs);
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die = copied;
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}
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vi->xattr_isize = erofs_xattr_ibody_size(die->i_xattr_icount);
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inode->i_mode = le16_to_cpu(die->i_mode);
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iu = die->i_u;
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i_uid_write(inode, le32_to_cpu(die->i_uid));
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i_gid_write(inode, le32_to_cpu(die->i_gid));
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set_nlink(inode, le32_to_cpu(die->i_nlink));
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/* each extended inode has its own timestamp */
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inode_set_ctime(inode, le64_to_cpu(die->i_mtime),
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le32_to_cpu(die->i_mtime_nsec));
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inode->i_size = le64_to_cpu(die->i_size);
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kfree(copied);
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break;
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case EROFS_INODE_LAYOUT_COMPACT:
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vi->inode_isize = sizeof(struct erofs_inode_compact);
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ofs += vi->inode_isize;
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vi->xattr_isize = erofs_xattr_ibody_size(dic->i_xattr_icount);
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inode->i_mode = le16_to_cpu(dic->i_mode);
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iu = dic->i_u;
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i_uid_write(inode, le16_to_cpu(dic->i_uid));
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i_gid_write(inode, le16_to_cpu(dic->i_gid));
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set_nlink(inode, le16_to_cpu(dic->i_nlink));
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/* use build time for compact inodes */
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inode_set_ctime(inode, sbi->build_time, sbi->build_time_nsec);
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inode->i_size = le32_to_cpu(dic->i_size);
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break;
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default:
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erofs_err(sb, "unsupported on-disk inode version %u of nid %llu",
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erofs_inode_version(ifmt), vi->nid);
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err = -EOPNOTSUPP;
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goto err_out;
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}
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if (unlikely(inode->i_size < 0)) {
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erofs_err(sb, "negative i_size @ nid %llu", vi->nid);
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err = -EFSCORRUPTED;
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goto err_out;
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}
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switch (inode->i_mode & S_IFMT) {
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case S_IFREG:
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case S_IFDIR:
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case S_IFLNK:
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vi->raw_blkaddr = le32_to_cpu(iu.raw_blkaddr);
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if(S_ISLNK(inode->i_mode)) {
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err = erofs_fill_symlink(inode, kaddr, ofs);
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if (err)
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goto err_out;
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}
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break;
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case S_IFCHR:
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case S_IFBLK:
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inode->i_rdev = new_decode_dev(le32_to_cpu(iu.rdev));
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break;
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case S_IFIFO:
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case S_IFSOCK:
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inode->i_rdev = 0;
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break;
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default:
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erofs_err(sb, "bogus i_mode (%o) @ nid %llu", inode->i_mode,
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vi->nid);
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err = -EFSCORRUPTED;
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goto err_out;
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}
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/* total blocks for compressed files */
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if (erofs_inode_is_data_compressed(vi->datalayout)) {
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nblks = le32_to_cpu(iu.compressed_blocks);
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} else if (vi->datalayout == EROFS_INODE_CHUNK_BASED) {
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/* fill chunked inode summary info */
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vi->chunkformat = le16_to_cpu(iu.c.format);
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if (vi->chunkformat & ~EROFS_CHUNK_FORMAT_ALL) {
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erofs_err(sb, "unsupported chunk format %x of nid %llu",
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vi->chunkformat, vi->nid);
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err = -EOPNOTSUPP;
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goto err_out;
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}
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vi->chunkbits = sb->s_blocksize_bits +
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(vi->chunkformat & EROFS_CHUNK_FORMAT_BLKBITS_MASK);
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}
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inode_set_mtime_to_ts(inode,
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inode_set_atime_to_ts(inode, inode_get_ctime(inode)));
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inode->i_flags &= ~S_DAX;
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if (test_opt(&sbi->opt, DAX_ALWAYS) && S_ISREG(inode->i_mode) &&
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(vi->datalayout == EROFS_INODE_FLAT_PLAIN ||
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vi->datalayout == EROFS_INODE_CHUNK_BASED))
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inode->i_flags |= S_DAX;
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if (!nblks)
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/* measure inode.i_blocks as generic filesystems */
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inode->i_blocks = round_up(inode->i_size, sb->s_blocksize) >> 9;
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else
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inode->i_blocks = nblks << (sb->s_blocksize_bits - 9);
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err_out:
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DBG_BUGON(err);
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erofs_put_metabuf(&buf);
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return err;
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}
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static int erofs_fill_inode(struct inode *inode)
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{
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struct erofs_inode *vi = EROFS_I(inode);
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int err;
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trace_erofs_fill_inode(inode);
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/* read inode base data from disk */
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err = erofs_read_inode(inode);
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if (err)
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return err;
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/* setup the new inode */
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switch (inode->i_mode & S_IFMT) {
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case S_IFREG:
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inode->i_op = &erofs_generic_iops;
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if (erofs_inode_is_data_compressed(vi->datalayout))
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inode->i_fop = &generic_ro_fops;
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else
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inode->i_fop = &erofs_file_fops;
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break;
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case S_IFDIR:
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inode->i_op = &erofs_dir_iops;
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inode->i_fop = &erofs_dir_fops;
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inode_nohighmem(inode);
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break;
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case S_IFLNK:
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if (inode->i_link)
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inode->i_op = &erofs_fast_symlink_iops;
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else
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inode->i_op = &erofs_symlink_iops;
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inode_nohighmem(inode);
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break;
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case S_IFCHR:
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case S_IFBLK:
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case S_IFIFO:
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case S_IFSOCK:
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inode->i_op = &erofs_generic_iops;
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init_special_inode(inode, inode->i_mode, inode->i_rdev);
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return 0;
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default:
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return -EFSCORRUPTED;
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}
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mapping_set_large_folios(inode->i_mapping);
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if (erofs_inode_is_data_compressed(vi->datalayout)) {
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#ifdef CONFIG_EROFS_FS_ZIP
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DO_ONCE_LITE_IF(inode->i_blkbits != PAGE_SHIFT,
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erofs_info, inode->i_sb,
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"EXPERIMENTAL EROFS subpage compressed block support in use. Use at your own risk!");
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inode->i_mapping->a_ops = &z_erofs_aops;
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#else
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err = -EOPNOTSUPP;
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#endif
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} else {
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inode->i_mapping->a_ops = &erofs_aops;
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#ifdef CONFIG_EROFS_FS_ONDEMAND
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if (erofs_is_fscache_mode(inode->i_sb))
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inode->i_mapping->a_ops = &erofs_fscache_access_aops;
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#endif
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#ifdef CONFIG_EROFS_FS_BACKED_BY_FILE
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if (erofs_is_fileio_mode(EROFS_SB(inode->i_sb)))
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inode->i_mapping->a_ops = &erofs_fileio_aops;
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#endif
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}
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return err;
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}
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/*
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* ino_t is 32-bits on 32-bit arch. We have to squash the 64-bit value down
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* so that it will fit.
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*/
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static ino_t erofs_squash_ino(erofs_nid_t nid)
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{
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ino_t ino = (ino_t)nid;
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if (sizeof(ino_t) < sizeof(erofs_nid_t))
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ino ^= nid >> (sizeof(erofs_nid_t) - sizeof(ino_t)) * 8;
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return ino;
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}
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static int erofs_iget5_eq(struct inode *inode, void *opaque)
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{
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return EROFS_I(inode)->nid == *(erofs_nid_t *)opaque;
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}
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static int erofs_iget5_set(struct inode *inode, void *opaque)
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{
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const erofs_nid_t nid = *(erofs_nid_t *)opaque;
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inode->i_ino = erofs_squash_ino(nid);
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EROFS_I(inode)->nid = nid;
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return 0;
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}
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struct inode *erofs_iget(struct super_block *sb, erofs_nid_t nid)
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{
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struct inode *inode;
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inode = iget5_locked(sb, erofs_squash_ino(nid), erofs_iget5_eq,
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erofs_iget5_set, &nid);
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if (!inode)
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return ERR_PTR(-ENOMEM);
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if (inode->i_state & I_NEW) {
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int err = erofs_fill_inode(inode);
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if (err) {
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iget_failed(inode);
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return ERR_PTR(err);
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}
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unlock_new_inode(inode);
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}
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return inode;
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}
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int erofs_getattr(struct mnt_idmap *idmap, const struct path *path,
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struct kstat *stat, u32 request_mask,
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unsigned int query_flags)
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{
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struct inode *const inode = d_inode(path->dentry);
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bool compressed =
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erofs_inode_is_data_compressed(EROFS_I(inode)->datalayout);
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if (compressed)
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stat->attributes |= STATX_ATTR_COMPRESSED;
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stat->attributes |= STATX_ATTR_IMMUTABLE;
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stat->attributes_mask |= (STATX_ATTR_COMPRESSED |
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STATX_ATTR_IMMUTABLE);
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/*
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* Return the DIO alignment restrictions if requested.
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*
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* In EROFS, STATX_DIOALIGN is not supported in ondemand mode and
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* compressed files, so in these cases we report no DIO support.
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*/
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if ((request_mask & STATX_DIOALIGN) && S_ISREG(inode->i_mode)) {
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stat->result_mask |= STATX_DIOALIGN;
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if (!erofs_is_fscache_mode(inode->i_sb) && !compressed) {
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stat->dio_mem_align =
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bdev_logical_block_size(inode->i_sb->s_bdev);
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stat->dio_offset_align = stat->dio_mem_align;
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}
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}
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generic_fillattr(idmap, request_mask, inode, stat);
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return 0;
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}
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const struct inode_operations erofs_generic_iops = {
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.getattr = erofs_getattr,
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.listxattr = erofs_listxattr,
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.get_inode_acl = erofs_get_acl,
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.fiemap = erofs_fiemap,
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};
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const struct inode_operations erofs_symlink_iops = {
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.get_link = page_get_link,
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.getattr = erofs_getattr,
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.listxattr = erofs_listxattr,
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.get_inode_acl = erofs_get_acl,
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};
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const struct inode_operations erofs_fast_symlink_iops = {
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.get_link = simple_get_link,
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.getattr = erofs_getattr,
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.listxattr = erofs_listxattr,
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.get_inode_acl = erofs_get_acl,
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};
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