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Theodore Ts'o 721972b866 ext4: check for invalid block size early when mounting a file system 
commit c9200760da upstream.

Check for valid block size directly by validating s_log_block_size; we
were doing this in two places.  First, by calculating blocksize via
BLOCK_SIZE << s_log_block_size, and then checking that the blocksize
was valid.  And then secondly, by checking s_log_block_size directly.

The first check is not reliable, and can trigger an UBSAN warning if
s_log_block_size on a maliciously corrupted superblock is greater than
22.  This is harmless, since the second test will correctly reject the
maliciously fuzzed file system, but to make syzbot shut up, and
because the two checks are duplicative in any case, delete the
blocksize check, and move the s_log_block_size earlier in
ext4_fill_super().

Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Reported-by: syzbot+345b75652b1d24227443@syzkaller.appspotmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-01-06 14:56:52 +01:00
..
acl.c ext4: main fast-commit commit path 2020-10-21 23:22:37 -04:00
acl.h ext4: fix up remaining files with SPDX cleanups 2017-12-17 22:00:59 -05:00
balloc.c ext4: fast commit recovery path 2020-10-21 23:22:38 -04:00
bitmap.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
block_validity.c ext4: rename system_blks to s_system_blks inside ext4_sb_info 2020-10-18 10:36:59 -04:00
dir.c ext4: use generic casefolding support 2020-10-28 13:43:13 -04:00
ext4.h ext4: fix bogus warning in ext4_update_dx_flag() 2020-11-19 22:41:10 -05:00
ext4_extents.h ext4: fix EXT_MAX_EXTENT/INDEX to check for zeroed eh_max 2020-06-03 23:16:49 -04:00
ext4_jbd2.c ext4: fast commit recovery path 2020-10-21 23:22:38 -04:00
ext4_jbd2.h ext4: drop ext4_journal_free_reserved() 2020-06-03 23:16:53 -04:00
extents.c ext4: fix an IS_ERR() vs NULL check 2020-12-30 11:54:13 +01:00
extents_status.c ext4: fast commit recovery path 2020-10-21 23:22:38 -04:00
extents_status.h ext4: fix extent_status trace points 2020-01-25 02:03:03 -05:00
fast_commit.c ext4: fix sparse warnings in fast_commit code 2020-11-07 00:08:23 -05:00
fast_commit.h ext4: disable fast commit with data journalling 2020-11-06 23:01:05 -05:00
file.c ext4: make s_mount_flags modifications atomic 2020-11-06 23:01:05 -05:00
fsmap.c jbd2: rename j_maxlen to j_total_len and add jbd2_journal_max_txn_bufs 2020-11-06 23:01:02 -05:00
fsmap.h ext4: fix up remaining files with SPDX cleanups 2017-12-17 22:00:59 -05:00
fsync.c ext4: make s_mount_flags modifications atomic 2020-11-06 23:01:05 -05:00
hash.c ext4: use generic casefolding support 2020-10-28 13:43:13 -04:00
ialloc.c The siginificant new ext4 feature this time around is Harshad's new 2020-10-22 10:31:08 -07:00
indirect.c ext4: use ext4_sb_bread() instead of sb_bread() 2020-10-18 10:37:14 -04:00
inline.c ext4: unlock xattr_sem properly in ext4_inline_data_truncate() 2020-11-06 22:52:36 -05:00
inode-test.c kunit: allow kunit tests to be loaded as a module 2020-01-09 16:42:29 -07:00
inode.c ext4: fix deadlock with fs freezing and EA inodes 2020-12-30 11:54:13 +01:00
ioctl.c ext4: fast commit recovery path 2020-10-21 23:22:38 -04:00
Kconfig ext4: replace HTTP links with HTTPS ones 2020-08-06 01:01:57 -04:00
Makefile ext4 / jbd2: add fast commit initialization 2020-10-21 23:22:26 -04:00
mballoc.c ext4: fix a memory leak of ext4_free_data 2020-12-30 11:54:13 +01:00
mballoc.h ext4: limit the length of per-inode prealloc list 2020-08-19 12:04:36 -04:00
migrate.c ext4: handle ext4_mark_inode_dirty errors 2020-06-03 23:16:50 -04:00
mmp.c ext4: use common helpers in all places reading metadata buffers 2020-10-18 10:37:14 -04:00
move_extent.c ext4: use common helpers in all places reading metadata buffers 2020-10-18 10:37:14 -04:00
namei.c ext4: prevent creating duplicate encrypted filenames 2020-12-26 16:02:44 +01:00
page-io.c ext4: add inline encryption support 2020-07-08 10:29:43 -07:00
readpage.c Improvements to ext4's block allocator performance for very large file 2020-08-21 11:03:38 -07:00
resize.c ext4: use ext4_sb_bread() instead of sb_bread() 2020-10-18 10:37:14 -04:00
super.c ext4: check for invalid block size early when mounting a file system 2021-01-06 14:56:52 +01:00
symlink.c ext4: switch to fscrypt_get_symlink() 2018-01-11 22:10:40 -05:00
sysfs.c ext4: indicate that fast_commit is available via /sys/fs/ext4/feature/... 2020-10-28 13:43:22 -04:00
truncate.h ext4: handle layout changes to pinned DAX mappings 2018-07-29 17:00:22 -04:00
verity.c mm/readahead: make page_cache_ra_unbounded take a readahead_control 2020-10-16 11:11:16 -07:00
xattr.c ext4: main fast-commit commit path 2020-10-21 23:22:37 -04:00
xattr.h ext4: support xattr gnu.* namespace for the Hurd 2020-06-12 13:23:34 -04:00
xattr_hurd.c ext4: support xattr gnu.* namespace for the Hurd 2020-06-12 13:23:34 -04:00
xattr_security.c ext4: use XATTR_CREATE in ext4_initxattrs() 2018-05-10 11:52:14 -04:00
xattr_trusted.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
xattr_user.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00