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| author | Theodore Ts'o <tytso@mit.edu> | 2015-10-03 10:49:29 -0400 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2015-10-03 10:49:29 -0400 |
| commit | 36086d43f6575c081067de9855786a2fc91df77b (patch) | |
| tree | ae42f97191ed243525e8c303d36425a23f5476c7 /fs/ext4/crypto.c | |
| parent | 687c3c36e754a999a8263745b27965128db4fee5 (diff) | |
| download | linux-36086d43f6575c081067de9855786a2fc91df77b.tar.gz | |
ext4 crypto: fix bugs in ext4_encrypted_zeroout()
Fix multiple bugs in ext4_encrypted_zeroout(), including one that
could cause us to write an encrypted zero page to the wrong location
on disk, potentially causing data and file system corruption.
Fortunately, this tends to only show up in stress tests, but even with
these fixes, we are seeing some test failures with generic/127 --- but
these are now caused by data failures instead of metadata corruption.
Since ext4_encrypted_zeroout() is only used for some optimizations to
keep the extent tree from being too fragmented, and
ext4_encrypted_zeroout() itself isn't all that optimized from a time
or IOPS perspective, disable the extent tree optimization for
encrypted inodes for now. This prevents the data corruption issues
reported by generic/127 until we can figure out what's going wrong.
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Cc: stable@vger.kernel.org
Diffstat (limited to 'fs/ext4/crypto.c')
| -rw-r--r-- | fs/ext4/crypto.c | 23 |
1 files changed, 19 insertions, 4 deletions
diff --git a/fs/ext4/crypto.c b/fs/ext4/crypto.c index 879cb15b7a21f..af06830bfc00c 100644 --- a/fs/ext4/crypto.c +++ b/fs/ext4/crypto.c @@ -392,7 +392,13 @@ int ext4_encrypted_zeroout(struct inode *inode, struct ext4_extent *ex) ext4_lblk_t lblk = ex->ee_block; ext4_fsblk_t pblk = ext4_ext_pblock(ex); unsigned int len = ext4_ext_get_actual_len(ex); - int err = 0; + int ret, err = 0; + +#if 0 + ext4_msg(inode->i_sb, KERN_CRIT, + "ext4_encrypted_zeroout ino %lu lblk %u len %u", + (unsigned long) inode->i_ino, lblk, len); +#endif BUG_ON(inode->i_sb->s_blocksize != PAGE_CACHE_SIZE); @@ -418,17 +424,26 @@ int ext4_encrypted_zeroout(struct inode *inode, struct ext4_extent *ex) goto errout; } bio->bi_bdev = inode->i_sb->s_bdev; - bio->bi_iter.bi_sector = pblk; - err = bio_add_page(bio, ciphertext_page, + bio->bi_iter.bi_sector = + pblk << (inode->i_sb->s_blocksize_bits - 9); + ret = bio_add_page(bio, ciphertext_page, inode->i_sb->s_blocksize, 0); - if (err) { + if (ret != inode->i_sb->s_blocksize) { + /* should never happen! */ + ext4_msg(inode->i_sb, KERN_ERR, + "bio_add_page failed: %d", ret); + WARN_ON(1); bio_put(bio); + err = -EIO; goto errout; } err = submit_bio_wait(WRITE, bio); + if ((err == 0) && bio->bi_error) + err = -EIO; bio_put(bio); if (err) goto errout; + lblk++; pblk++; } err = 0; errout: |