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| author | Theodore Ts'o <tytso@mit.edu> | 2019-04-09 23:37:08 -0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-09-16 08:22:11 +0200 |
| commit | 2fd4629de51974002f4e9cf1a35a1926dd6c9d99 (patch) | |
| tree | 478923fadbd59d0a649d0f50134115a9570ad8cf /fs/ext4/block_validity.c | |
| parent | f10a92309b8392637e388948e313d00c5d34bf1b (diff) | |
| download | linux-stable-2fd4629de51974002f4e9cf1a35a1926dd6c9d99.tar.gz linux-stable-2fd4629de51974002f4e9cf1a35a1926dd6c9d99.tar.bz2 linux-stable-2fd4629de51974002f4e9cf1a35a1926dd6c9d99.zip | |
ext4: protect journal inode's blocks using block_validity
[ Upstream commit 345c0dbf3a30872d9b204db96b5857cd00808cae ]
Add the blocks which belong to the journal inode to block_validity's
system zone so attempts to deallocate or overwrite the journal due a
corrupted file system where the journal blocks are also claimed by
another inode.
Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=202879
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Cc: stable@kernel.org
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'fs/ext4/block_validity.c')
| -rw-r--r-- | fs/ext4/block_validity.c | 48 |
1 files changed, 48 insertions, 0 deletions
diff --git a/fs/ext4/block_validity.c b/fs/ext4/block_validity.c index 913061c0de1b..9409b1e11a22 100644 --- a/fs/ext4/block_validity.c +++ b/fs/ext4/block_validity.c @@ -137,6 +137,48 @@ static void debug_print_tree(struct ext4_sb_info *sbi) printk(KERN_CONT "\n"); } +static int ext4_protect_reserved_inode(struct super_block *sb, u32 ino) +{ + struct inode *inode; + struct ext4_sb_info *sbi = EXT4_SB(sb); + struct ext4_map_blocks map; + u32 i = 0, err = 0, num, n; + + if ((ino < EXT4_ROOT_INO) || + (ino > le32_to_cpu(sbi->s_es->s_inodes_count))) + return -EINVAL; + inode = ext4_iget(sb, ino, EXT4_IGET_SPECIAL); + if (IS_ERR(inode)) + return PTR_ERR(inode); + num = (inode->i_size + sb->s_blocksize - 1) >> sb->s_blocksize_bits; + while (i < num) { + map.m_lblk = i; + map.m_len = num - i; + n = ext4_map_blocks(NULL, inode, &map, 0); + if (n < 0) { + err = n; + break; + } + if (n == 0) { + i++; + } else { + if (!ext4_data_block_valid(sbi, map.m_pblk, n)) { + ext4_error(sb, "blocks %llu-%llu from inode %u " + "overlap system zone", map.m_pblk, + map.m_pblk + map.m_len - 1, ino); + err = -EFSCORRUPTED; + break; + } + err = add_system_zone(sbi, map.m_pblk, n); + if (err < 0) + break; + i += n; + } + } + iput(inode); + return err; +} + int ext4_setup_system_zone(struct super_block *sb) { ext4_group_t ngroups = ext4_get_groups_count(sb); @@ -171,6 +213,12 @@ int ext4_setup_system_zone(struct super_block *sb) if (ret) return ret; } + if (ext4_has_feature_journal(sb) && sbi->s_es->s_journal_inum) { + ret = ext4_protect_reserved_inode(sb, + le32_to_cpu(sbi->s_es->s_journal_inum)); + if (ret) + return ret; + } if (test_opt(sb, DEBUG)) debug_print_tree(sbi); |