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65f8ea4cd5
linux/fs/ext4
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Lukas Czerner 65f8ea4cd5 ext4: check if directory block is within i_size 
Currently ext4 directory handling code implicitly assumes that the
directory blocks are always within the i_size. In fact ext4_append()
will attempt to allocate next directory block based solely on i_size and
the i_size is then appropriately increased after a successful
allocation.

However, for this to work it requires i_size to be correct. If, for any
reason, the directory inode i_size is corrupted in a way that the
directory tree refers to a valid directory block past i_size, we could
end up corrupting parts of the directory tree structure by overwriting
already used directory blocks when modifying the directory.

Fix it by catching the corruption early in __ext4_read_dirblock().

Addresses Red-Hat-Bugzilla: #2070205
CVE: CVE-2022-1184
Signed-off-by: Lukas Czerner <lczerner@redhat.com>
Cc: stable@vger.kernel.org
Reviewed-by: Andreas Dilger <adilger@dilger.ca>
Link: https://lore.kernel.org/r/20220704142721.157985-1-lczerner@redhat.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
2022-08-02 23:56:17 -04:00
..
.kunitconfig ext4: add .kunitconfig fragment to enable ext4-specific tests 2021-02-11 23:16:30 -05:00
acl.c fs/ext4: fix comments mentioning i_mutex 2022-02-03 10:57:53 -05:00
acl.h vfs: add rcu argument to ->get_acl() callback 2021-08-18 22:08:24 +02:00
balloc.c ext4: use ext4_debug() instead of jbd_debug() 2022-08-02 23:52:19 -04:00
bitmap.c
block_validity.c ext4: add ext4_sb_block_valid() refactored out of ext4_inode_block_valid() 2022-02-25 21:34:56 -05:00
crypto.c ext4: refactor and move ext4_ioctl_get_encryption_pwsalt() 2022-05-21 22:24:24 -04:00
dir.c ext4: fix spelling errors in comments 2022-05-11 15:19:06 -04:00
ext4_extents.h ext4: fix sparse warnings 2021-08-30 23:36:50 -04:00
ext4_jbd2.c ext4: use ext4_debug() instead of jbd_debug() 2022-08-02 23:52:19 -04:00
ext4_jbd2.h fs/ext4: fix comments mentioning i_mutex 2022-02-03 10:57:53 -05:00
ext4.h ext4: update the s_overhead_clusters in the backup sb's when resizing 2022-08-02 23:52:19 -04:00
extents_status.c ext4: correct the cache_nr in tracepoint ext4_es_shrink_exit 2021-06-22 21:34:17 -04:00
extents_status.h ext4: fix extent_status trace points 2020-01-25 02:03:03 -05:00
extents.c ext4: fix bug_on in __es_tree_search 2022-05-24 15:34:17 -04:00
fast_commit.c ext4: use ext4_debug() instead of jbd_debug() 2022-08-02 23:52:19 -04:00
fast_commit.h flexible-array transformations for 5.18-rc1 2022-03-24 11:39:32 -07:00
file.c iomap: add per-iomap_iter private data 2022-05-16 17:17:32 +02:00
fsmap.c treewide: Change list_sort to use const pointers 2021-04-08 16:04:22 -07:00
fsmap.h ext4: fsmap: fix the block/inode bitmap comment 2021-06-24 09:48:29 -04:00
fsync.c block: use an on-stack bio in blkdev_issue_flush 2021-01-27 09:51:48 -07:00
hash.c unicode: clean up the Kconfig symbol confusion 2022-01-20 19:57:24 -05:00
ialloc.c ext4: Support for checksumming from journal triggers 2021-08-30 23:36:50 -04:00
indirect.c ext4: use ext4_debug() instead of jbd_debug() 2022-08-02 23:52:19 -04:00
inline.c ext4: correct max_inline_xattr_value_size computing 2022-08-02 23:52:44 -04:00
inode-test.c fs: ext4: Modify inode-test.c to use KUnit parameterized testing feature 2020-12-02 16:07:25 -07:00
inode.c ext4: fix warning in ext4_iomap_begin as race between bmap and write 2022-08-02 23:56:02 -04:00
ioctl.c ext4: update the s_overhead_clusters in the backup sb's when resizing 2022-08-02 23:52:19 -04:00
Kconfig ext: EXT4_KUNIT_TESTS should depend on EXT4_FS instead of selecting it 2021-02-11 23:12:59 -05:00
Makefile ext4: move ext4 crypto code to its own file crypto.c 2022-05-21 22:24:24 -04:00
mballoc.c ext4: reuse order and buddy in mb_mark_used when buddy split 2022-08-02 23:52:19 -04:00
mballoc.h ext4: fix various seppling typos 2021-04-09 23:14:59 -04:00
migrate.c ext4: recover csum seed of tmp_inode after migrating to extents 2022-08-02 23:56:02 -04:00
mmp.c ext4: remove unnecessary type castings 2022-05-11 15:19:06 -04:00
move_extent.c ext4: Convert ext4 to read_folio 2022-05-09 16:21:45 -04:00
namei.c ext4: check if directory block is within i_size 2022-08-02 23:56:17 -04:00
orphan.c ext4: use ext4_debug() instead of jbd_debug() 2022-08-02 23:52:19 -04:00
page-io.c ext4: fix incorrect comment in ext4_bio_write_page() 2022-06-16 11:03:16 -04:00
readpage.c fs: Convert block_read_full_page() to block_read_full_folio() 2022-05-09 16:21:44 -04:00
resize.c ext4: update the s_overhead_clusters in the backup sb's when resizing 2022-08-02 23:52:19 -04:00
super.c ext4: reflect mb_optimize_scan value in options file 2022-08-02 23:56:17 -04:00
symlink.c ext4: fix reading leftover inlined symlinks 2022-08-02 23:37:50 -04:00
sysfs.c unicode: clean up the Kconfig symbol confusion 2022-01-20 19:57:24 -05:00
truncate.h ext4: Convert to use mapping->invalidate_lock 2021-07-13 14:29:00 +02:00
verity.c ext4: Call aops write_begin() and write_end() directly 2022-05-08 14:45:56 -04:00
xattr_hurd.c acl: handle idmapped mounts 2021-01-24 14:27:17 +01:00
xattr_security.c acl: handle idmapped mounts 2021-01-24 14:27:17 +01:00
xattr_trusted.c acl: handle idmapped mounts 2021-01-24 14:27:17 +01:00
xattr_user.c acl: handle idmapped mounts 2021-01-24 14:27:17 +01:00
xattr.c ext4: fix use-after-free in ext4_xattr_set_entry 2022-08-02 23:52:34 -04:00
xattr.h ext4: aligned '*' in comments 2022-08-02 23:56:17 -04:00