linux-stable.git/fs/ext4, branch v4.19.2

ext4: fix use-after-free race in ext4_remount()'s error path

2018-11-13T19:08:43+00:00

commit 33458eaba4dfe778a426df6a19b7aad2ff9f7eec upstream.

It's possible for ext4_show_quota_options() to try reading
s_qf_names[i] while it is being modified by ext4_remount() --- most
notably, in ext4_remount's error path when the original values of the
quota file name gets restored.

Reported-by: syzbot+a2872d6feea6918008a9@syzkaller.appspotmail.com
Signed-off-by: Theodore Ts'o 
Cc: stable@kernel.org # 3.2+
Signed-off-by: Greg Kroah-Hartman

ext4: propagate error from dquot_initialize() in EXT4_IOC_FSSETXATTR

2018-11-13T19:08:43+00:00

commit 182a79e0c17147d2c2d3990a9a7b6b58a1561c7a upstream.

We return most failure of dquota_initialize() except
inode evict, this could make a bit sense, for example
we allow file removal even quota files are broken?

But it dosen't make sense to allow setting project
if quota files etc are broken.

Signed-off-by: Wang Shilong 
Signed-off-by: Theodore Ts'o 
Cc: stable@kernel.org
Signed-off-by: Greg Kroah-Hartman

ext4: fix setattr project check in fssetxattr ioctl

2018-11-13T19:08:43+00:00

commit dc7ac6c4cae3b58724c2f1e21a7c05ce19ecd5a8 upstream.

Currently, project quota could be changed by fssetxattr
ioctl, and existed permission check inode_owner_or_capable()
is obviously not enough, just think that common users could
change project id of file, that could make users to
break project quota easily.

This patch try to follow same regular of xfs project
quota:

"Project Quota ID state is only allowed to change from
within the init namespace. Enforce that restriction only
if we are trying to change the quota ID state.
Everything else is allowed in user namespaces."

Besides that, check and set project id'state should
be an atomic operation, protect whole operation with
inode lock, ext4_ioctl_setproject() is only used for
ioctl EXT4_IOC_FSSETXATTR, we have held mnt_want_write_file()
before ext4_ioctl_setflags(), and ext4_ioctl_setproject()
is called after ext4_ioctl_setflags(), we could share
codes, so remove it inside ext4_ioctl_setproject().

Signed-off-by: Wang Shilong 
Signed-off-by: Theodore Ts'o 
Reviewed-by: Andreas Dilger 
Cc: stable@kernel.org
Signed-off-by: Greg Kroah-Hartman

ext4: initialize retries variable in ext4_da_write_inline_data_begin()

2018-11-13T19:08:43+00:00

commit 625ef8a3acd111d5f496d190baf99d1a815bd03e upstream.

Variable retries is not initialized in ext4_da_write_inline_data_begin()
which can lead to nondeterministic number of retries in case we hit
ENOSPC. Initialize retries to zero as we do everywhere else.

Signed-off-by: Lukas Czerner 
Signed-off-by: Theodore Ts'o 
Fixes: bc0ca9df3b2a ("ext4: retry allocation when inline->extent conversion failed")
Cc: stable@kernel.org
Signed-off-by: Greg Kroah-Hartman

ext4: fix EXT4_IOC_SWAP_BOOT

2018-11-13T19:08:43+00:00

commit 18aded17492088962ef43f00825179598b3e8c58 upstream.

The code EXT4_IOC_SWAP_BOOT ioctl hasn't been updated in a while, and
it's a bit broken with respect to more modern ext4 kernels, especially
metadata checksums.

Other problems fixed with this commit:

* Don't allow installing a DAX, swap file, or an encrypted file as a
  boot loader.

* Respect the immutable and append-only flags.

* Wait until any DIO operations are finished *before* calling
  truncate_inode_pages().

* Don't swap inode->i_flags, since these flags have nothing to do with
  the inode blocks --- and it will give the IMA/audit code heartburn
  when the inode is evicted.

Signed-off-by: Theodore Ts'o 
Cc: stable@kernel.org
Reported-by: syzbot+e81ccd4744c6c4f71354@syzkaller.appspotmail.com
Signed-off-by: Greg Kroah-Hartman

ext4: fix argument checking in EXT4_IOC_MOVE_EXT

2018-11-13T19:08:35+00:00

[ Upstream commit f18b2b83a727a3db208308057d2c7945f368e625 ]

If the starting block number of either the source or destination file
exceeds the EOF, EXT4_IOC_MOVE_EXT should return EINVAL.

Also fixed the helper function mext_check_coverage() so that if the
logical block is beyond EOF, make it return immediately, instead of
looping until the block number wraps all the away around.  This takes
long enough that if there are multiple threads trying to do pound on
an the same inode doing non-sensical things, it can end up triggering
the kernel's soft lockup detector.

Reported-by: syzbot+c61979f6f2cba5cb3c06@syzkaller.appspotmail.com
Signed-off-by: Theodore Ts'o 
Cc: stable@kernel.org
Signed-off-by: Sasha Levin 
Signed-off-by: Greg Kroah-Hartman

Merge tag 'ext4_for_linus_stable' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4

2018-09-17T07:13:47+00:00

Ted writes:
	Various ext4 bug fixes; primarily making ext4 more robust against
	maliciously crafted file systems, and some DAX fixes.

* tag 'ext4_for_linus_stable' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4:
  ext4, dax: set ext4_dax_aops for dax files
  ext4, dax: add ext4_bmap to ext4_dax_aops
  ext4: don't mark mmp buffer head dirty
  ext4: show test_dummy_encryption mount option in /proc/mounts
  ext4: close race between direct IO and ext4_break_layouts()
  ext4: fix online resizing for bigalloc file systems with a 1k block size
  ext4: fix online resize's handling of a too-small final block group
  ext4: recalucate superblock checksum after updating free blocks/inodes
  ext4: avoid arithemetic overflow that can trigger a BUG
  ext4: avoid divide by zero fault when deleting corrupted inline directories
  ext4: check to make sure the rename(2)'s destination is not freed
  ext4: add nonstring annotations to ext4.h

ext4, dax: set ext4_dax_aops for dax files

2018-09-16T01:37:59+00:00

Sync syscall to DAX file needs to flush processor cache, but it
currently does not flush to existing DAX files.  This is because
'ext4_da_aops' is set to address_space_operations of existing DAX
files, instead of 'ext4_dax_aops', since S_DAX flag is set after
ext4_set_aops() in the open path.

  New file
  --------
  lookup_open
    ext4_create
      __ext4_new_inode
        ext4_set_inode_flags   // Set S_DAX flag
      ext4_set_aops            // Set aops to ext4_dax_aops

  Existing file
  -------------
  lookup_open
    ext4_lookup
      ext4_iget
        ext4_set_aops          // Set aops to ext4_da_aops
        ext4_set_inode_flags   // Set S_DAX flag

Change ext4_iget() to initialize i_flags before ext4_set_aops().

Fixes: 5f0663bb4a64 ("ext4, dax: introduce ext4_dax_aops")
Signed-off-by: Toshi Kani 
Signed-off-by: Theodore Ts'o 
Suggested-by: Jan Kara 
Cc: stable@vger.kernel.org

ext4, dax: add ext4_bmap to ext4_dax_aops

2018-09-16T01:23:41+00:00

Ext4 mount path calls .bmap to the journal inode. This currently
works for the DAX mount case because ext4_iget() always set
'ext4_da_aops' to any regular files.

In preparation to fix ext4_iget() to set 'ext4_dax_aops' for ext4
DAX files, add ext4_bmap() to 'ext4_dax_aops', since bmap works for
DAX inodes.

Fixes: 5f0663bb4a64 ("ext4, dax: introduce ext4_dax_aops")
Signed-off-by: Toshi Kani 
Signed-off-by: Theodore Ts'o 
Suggested-by: Jan Kara 
Cc: stable@vger.kernel.org

ext4: don't mark mmp buffer head dirty

2018-09-15T21:11:25+00:00

Marking mmp bh dirty before writing it will make writeback
pick up mmp block later and submit a write, we don't want the
duplicate write as kmmpd thread should have full control of
reading and writing the mmp block.
Another reason is we will also have random I/O error on
the writeback request when blk integrity is enabled, because
kmmpd could modify the content of the mmp block(e.g. setting
new seq and time) while the mmp block is under I/O requested
by writeback.

Signed-off-by: Li Dongyang 
Signed-off-by: Theodore Ts'o 
Reviewed-by: Andreas Dilger 
Cc: stable@vger.kernel.org