[SRU][F][PATCH 0/4] CVE-2021-3428

[Luke Nowakowski-Krijger]

[Impact]
Mounting a crafted ext4 filesystem can trigger an integer overflow
that occurs in ext4_es_cache_extent(). This yields a kernel bug that can
lead to a system crash and denial of service.

[Backports]
Updated minor context changes in fs/ext4/ext4.h to include sbi_array_rcu_deref
define.

[Test case]
Reproduced the bug using the reproducer here
(https://bugzilla.suse.com/show_bug.cgi?id=1173485),
confirmed that after the patches are applied that the system reports a
malformed filesystem and mounting fails.

[Potential regression]
Journal inodes are no longer a special case when checking extent trees
which means that some filesystems that could be mounted could now fail.

Jan Kara (1):
  ext4: check journal inode extents more carefully

Theodore Ts'o (3):
  ext4: save the error code which triggered an ext4_error() in the
    superblock
  ext4: simulate various I/O and checksum errors when reading metadata
  ext4: save all error info in save_error_info() and drop
    ext4_set_errno()

 fs/ext4/balloc.c         |  10 ++--
 fs/ext4/block_validity.c |  59 +++++++++---------
 fs/ext4/ext4.h           | 125 ++++++++++++++++++++++++++++++++-------
 fs/ext4/ext4_jbd2.c      |  10 ++--
 fs/ext4/extents.c        |  42 ++++++-------
 fs/ext4/ialloc.c         |  15 +++--
 fs/ext4/indirect.c       |   8 +--
 fs/ext4/inline.c         |  11 ++--
 fs/ext4/inode.c          |  38 ++++++------
 fs/ext4/mballoc.c        |  21 +++----
 fs/ext4/mmp.c            |  13 ++--
 fs/ext4/move_extent.c    |   4 +-
 fs/ext4/namei.c          |  31 ++++++----
 fs/ext4/super.c          | 106 +++++++++++++++++++++++++--------
 fs/ext4/sysfs.c          |  23 +++++++
 fs/ext4/xattr.c          |  12 ++--
 16 files changed, 351 insertions(+), 177 deletions(-)

-- 
2.30.2