Please consider pulling fs-verity for 5.4.
fs-verity is a filesystem feature that provides Merkle tree based
hashing (similar to dm-verity) for individual readonly files, mainly for
the purpose of efficient authenticity verification.
This pull request includes:
(a) The fs/verity/ support layer and documentation.
(b) fs-verity support for ext4 and f2fs.
Compared to the original fs-verity patchset from last year, the UAPI to
enable fs-verity on a file has been greatly simplified. Lots of other
things were cleaned up too.
fs-verity is planned to be used by two different projects on Android;
most of the userspace code is in place already. Another userspace tool
("fsverity-utils"), and xfstests, are also available. e2fsprogs and
f2fs-tools already have fs-verity support. Other people have shown
interest in using fs-verity too.
I've tested this on ext4 and f2fs with xfstests, both the existing tests
and the new fs-verity tests. This has also been in linux-next since
July 30 with no reported issues except a couple minor ones I found
myself and folded in fixes for.
Ted and I will be co-maintaining fs-verity.
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Merge tag 'fsverity-for-linus' of git://git.kernel.org/pub/scm/fs/fscrypt/fscrypt
Pull fs-verity support from Eric Biggers:
"fs-verity is a filesystem feature that provides Merkle tree based
hashing (similar to dm-verity) for individual readonly files, mainly
for the purpose of efficient authenticity verification.
This pull request includes:
(a) The fs/verity/ support layer and documentation.
(b) fs-verity support for ext4 and f2fs.
Compared to the original fs-verity patchset from last year, the UAPI
to enable fs-verity on a file has been greatly simplified. Lots of
other things were cleaned up too.
fs-verity is planned to be used by two different projects on Android;
most of the userspace code is in place already. Another userspace tool
("fsverity-utils"), and xfstests, are also available. e2fsprogs and
f2fs-tools already have fs-verity support. Other people have shown
interest in using fs-verity too.
I've tested this on ext4 and f2fs with xfstests, both the existing
tests and the new fs-verity tests. This has also been in linux-next
since July 30 with no reported issues except a couple minor ones I
found myself and folded in fixes for.
Ted and I will be co-maintaining fs-verity"
* tag 'fsverity-for-linus' of git://git.kernel.org/pub/scm/fs/fscrypt/fscrypt:
f2fs: add fs-verity support
ext4: update on-disk format documentation for fs-verity
ext4: add fs-verity read support
ext4: add basic fs-verity support
fs-verity: support builtin file signatures
fs-verity: add SHA-512 support
fs-verity: implement FS_IOC_MEASURE_VERITY ioctl
fs-verity: implement FS_IOC_ENABLE_VERITY ioctl
fs-verity: add data verification hooks for ->readpages()
fs-verity: add the hook for file ->setattr()
fs-verity: add the hook for file ->open()
fs-verity: add inode and superblock fields
fs-verity: add Kconfig and the helper functions for hashing
fs: uapi: define verity bit for FS_IOC_GETFLAGS
fs-verity: add UAPI header
fs-verity: add MAINTAINERS file entry
fs-verity: add a documentation file
This is a large update to fs/crypto/ which includes:
- Add ioctls that add/remove encryption keys to/from a filesystem-level
keyring. These fix user-reported issues where e.g. an encrypted home
directory can break NetworkManager, sshd, Docker, etc. because they
don't get access to the needed keyring. These ioctls also provide a
way to lock encrypted directories that doesn't use the vm.drop_caches
sysctl, so is faster, more reliable, and doesn't always need root.
- Add a new encryption policy version ("v2") which switches to a more
standard, secure, and flexible key derivation function, and starts
verifying that the correct key was supplied before using it. The key
derivation improvement is needed for its own sake as well as for
ongoing feature work for which the current way is too inflexible.
Work is in progress to update both Android and the 'fscrypt' userspace
tool to use both these features. (Working patches are available and
just need to be reviewed+merged.) Chrome OS will likely use them too.
This has also been tested on ext4, f2fs, and ubifs with xfstests -- both
the existing encryption tests, and the new tests for this. This has
also been in linux-next since Aug 16 with no reported issues. I'm also
using an fscrypt v2-encrypted home directory on my personal desktop.
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Merge tag 'fscrypt-for-linus' of git://git.kernel.org/pub/scm/fs/fscrypt/fscrypt
Pull fscrypt updates from Eric Biggers:
"This is a large update to fs/crypto/ which includes:
- Add ioctls that add/remove encryption keys to/from a
filesystem-level keyring.
These fix user-reported issues where e.g. an encrypted home
directory can break NetworkManager, sshd, Docker, etc. because they
don't get access to the needed keyring. These ioctls also provide a
way to lock encrypted directories that doesn't use the
vm.drop_caches sysctl, so is faster, more reliable, and doesn't
always need root.
- Add a new encryption policy version ("v2") which switches to a more
standard, secure, and flexible key derivation function, and starts
verifying that the correct key was supplied before using it.
The key derivation improvement is needed for its own sake as well
as for ongoing feature work for which the current way is too
inflexible.
Work is in progress to update both Android and the 'fscrypt' userspace
tool to use both these features. (Working patches are available and
just need to be reviewed+merged.) Chrome OS will likely use them too.
This has also been tested on ext4, f2fs, and ubifs with xfstests --
both the existing encryption tests, and the new tests for this. This
has also been in linux-next since Aug 16 with no reported issues. I'm
also using an fscrypt v2-encrypted home directory on my personal
desktop"
* tag 'fscrypt-for-linus' of git://git.kernel.org/pub/scm/fs/fscrypt/fscrypt: (27 commits)
ext4 crypto: fix to check feature status before get policy
fscrypt: document the new ioctls and policy version
ubifs: wire up new fscrypt ioctls
f2fs: wire up new fscrypt ioctls
ext4: wire up new fscrypt ioctls
fscrypt: require that key be added when setting a v2 encryption policy
fscrypt: add FS_IOC_REMOVE_ENCRYPTION_KEY_ALL_USERS ioctl
fscrypt: allow unprivileged users to add/remove keys for v2 policies
fscrypt: v2 encryption policy support
fscrypt: add an HKDF-SHA512 implementation
fscrypt: add FS_IOC_GET_ENCRYPTION_KEY_STATUS ioctl
fscrypt: add FS_IOC_REMOVE_ENCRYPTION_KEY ioctl
fscrypt: add FS_IOC_ADD_ENCRYPTION_KEY ioctl
fscrypt: rename keyinfo.c to keysetup.c
fscrypt: move v1 policy key setup to keysetup_v1.c
fscrypt: refactor key setup code in preparation for v2 policies
fscrypt: rename fscrypt_master_key to fscrypt_direct_key
fscrypt: add ->ci_inode to fscrypt_info
fscrypt: use FSCRYPT_* definitions, not FS_*
fscrypt: use FSCRYPT_ prefix for uapi constants
...
This reverts commit b03755ad6f.
This is sad, and done for all the wrong reasons. Because that commit is
good, and does exactly what it says: avoids a lot of small disk requests
for the inode table read-ahead.
However, it turns out that it causes an entirely unrelated problem: the
getrandom() system call was introduced back in 2014 by commit
c6e9d6f388 ("random: introduce getrandom(2) system call"), and people
use it as a convenient source of good random numbers.
But part of the current semantics for getrandom() is that it waits for
the entropy pool to fill at least partially (unlike /dev/urandom). And
at least ArchLinux apparently has a systemd that uses getrandom() at
boot time, and the improvements in IO patterns means that existing
installations suddenly start hanging, waiting for entropy that will
never happen.
It seems to be an unlucky combination of not _quite_ enough entropy,
together with a particular systemd version and configuration. Lennart
says that the systemd-random-seed process (which is what does this early
access) is supposed to not block any other boot activity, but sadly that
doesn't actually seem to be the case (possibly due bogus dependencies on
cryptsetup for encrypted swapspace).
The correct fix is to fix getrandom() to not block when it's not
appropriate, but that fix is going to take a lot more discussion. Do we
just make it act like /dev/urandom by default, and add a new flag for
"wait for entropy"? Do we add a boot-time option? Or do we just limit
the amount of time it will wait for entropy?
So in the meantime, we do the revert to give us time to discuss the
eventual fix for the fundamental problem, at which point we can re-apply
the ext4 inode table access optimization.
Reported-by: Ahmed S. Darwish <darwish.07@gmail.com>
Cc: Ted Ts'o <tytso@mit.edu>
Cc: Willy Tarreau <w@1wt.eu>
Cc: Alexander E. Patrakov <patrakov@gmail.com>
Cc: Lennart Poettering <mzxreary@0pointer.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
When getting fscrypt policy via EXT4_IOC_GET_ENCRYPTION_POLICY, if
encryption feature is off, it's better to return EOPNOTSUPP instead of
ENODATA, so let's add ext4_has_feature_encrypt() to do the check for
that.
This makes it so that all fscrypt ioctls consistently check for the
encryption feature, and makes ext4 consistent with f2fs in this regard.
Signed-off-by: Chao Yu <yuchao0@huawei.com>
[EB - removed unneeded braces, updated the documentation, and
added more explanation to commit message]
Signed-off-by: Eric Biggers <ebiggers@google.com>
Make ext4_mpage_readpages() verify data as it is read from fs-verity
files, using the helper functions from fs/verity/.
To support both encryption and verity simultaneously, this required
refactoring the decryption workflow into a generic "post-read
processing" workflow which can do decryption, verification, or both.
The case where the ext4 block size is not equal to the PAGE_SIZE is not
supported yet, since in that case ext4_mpage_readpages() sometimes falls
back to block_read_full_page(), which does not support fs-verity yet.
Co-developed-by: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Eric Biggers <ebiggers@google.com>
Add most of fs-verity support to ext4. fs-verity is a filesystem
feature that enables transparent integrity protection and authentication
of read-only files. It uses a dm-verity like mechanism at the file
level: a Merkle tree is used to verify any block in the file in
log(filesize) time. It is implemented mainly by helper functions in
fs/verity/. See Documentation/filesystems/fsverity.rst for the full
documentation.
This commit adds all of ext4 fs-verity support except for the actual
data verification, including:
- Adding a filesystem feature flag and an inode flag for fs-verity.
- Implementing the fsverity_operations to support enabling verity on an
inode and reading/writing the verity metadata.
- Updating ->write_begin(), ->write_end(), and ->writepages() to support
writing verity metadata pages.
- Calling the fs-verity hooks for ->open(), ->setattr(), and ->ioctl().
ext4 stores the verity metadata (Merkle tree and fsverity_descriptor)
past the end of the file, starting at the first 64K boundary beyond
i_size. This approach works because (a) verity files are readonly, and
(b) pages fully beyond i_size aren't visible to userspace but can be
read/written internally by ext4 with only some relatively small changes
to ext4. This approach avoids having to depend on the EA_INODE feature
and on rearchitecturing ext4's xattr support to support paging
multi-gigabyte xattrs into memory, and to support encrypting xattrs.
Note that the verity metadata *must* be encrypted when the file is,
since it contains hashes of the plaintext data.
This patch incorporates work by Theodore Ts'o and Chandan Rajendra.
Reviewed-by: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Eric Biggers <ebiggers@google.com>
Wire up the new ioctls for adding and removing fscrypt keys to/from the
filesystem, and the new ioctl for retrieving v2 encryption policies.
The key removal ioctls also required making ext4_drop_inode() call
fscrypt_drop_inode().
For more details see Documentation/filesystems/fscrypt.rst and the
fscrypt patches that added the implementation of these ioctls.
Reviewed-by: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Eric Biggers <ebiggers@google.com>
persistent memory device that allows a guest VM to use DAX mechanisms to
access a host-file with host-page-cache. It arranges for MAP_SYNC to
be disabled and instead triggers a host fsync() when a 'write-cache
flush' command is sent to the virtual disk device.
- Miscellaneous small fixups.
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Merge tag 'libnvdimm-for-5.3' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm
Pull libnvdimm updates from Dan Williams:
"Primarily just the virtio_pmem driver:
- virtio_pmem
The new virtio_pmem facility introduces a paravirtualized
persistent memory device that allows a guest VM to use DAX
mechanisms to access a host-file with host-page-cache. It arranges
for MAP_SYNC to be disabled and instead triggers a host fsync()
when a 'write-cache flush' command is sent to the virtual disk
device.
- Miscellaneous small fixups"
* tag 'libnvdimm-for-5.3' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm:
virtio_pmem: fix sparse warning
xfs: disable map_sync for async flush
ext4: disable map_sync for async flush
dax: check synchronous mapping is supported
dm: enable synchronous dax
libnvdimm: add dax_dev sync flag
virtio-pmem: Add virtio pmem driver
libnvdimm: nd_region flush callback support
libnvdimm, namespace: Drop uuid_t implementation detail
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Merge tag 'for-linus-20190715' of git://git.kernel.dk/linux-block
Pull more block updates from Jens Axboe:
"A later pull request with some followup items. I had some vacation
coming up to the merge window, so certain things items were delayed a
bit. This pull request also contains fixes that came in within the
last few days of the merge window, which I didn't want to push right
before sending you a pull request.
This contains:
- NVMe pull request, mostly fixes, but also a few minor items on the
feature side that were timing constrained (Christoph et al)
- Report zones fixes (Damien)
- Removal of dead code (Damien)
- Turn on cgroup psi memstall (Josef)
- block cgroup MAINTAINERS entry (Konstantin)
- Flush init fix (Josef)
- blk-throttle low iops timing fix (Konstantin)
- nbd resize fixes (Mike)
- nbd 0 blocksize crash fix (Xiubo)
- block integrity error leak fix (Wenwen)
- blk-cgroup writeback and priority inheritance fixes (Tejun)"
* tag 'for-linus-20190715' of git://git.kernel.dk/linux-block: (42 commits)
MAINTAINERS: add entry for block io cgroup
null_blk: fixup ->report_zones() for !CONFIG_BLK_DEV_ZONED
block: Limit zone array allocation size
sd_zbc: Fix report zones buffer allocation
block: Kill gfp_t argument of blkdev_report_zones()
block: Allow mapping of vmalloc-ed buffers
block/bio-integrity: fix a memory leak bug
nvme: fix NULL deref for fabrics options
nbd: add netlink reconfigure resize support
nbd: fix crash when the blksize is zero
block: Disable write plugging for zoned block devices
block: Fix elevator name declaration
block: Remove unused definitions
nvme: fix regression upon hot device removal and insertion
blk-throttle: fix zero wait time for iops throttled group
block: Fix potential overflow in blk_report_zones()
blkcg: implement REQ_CGROUP_PUNT
blkcg, writeback: Implement wbc_blkcg_css()
blkcg, writeback: Add wbc->no_cgroup_owner
blkcg, writeback: Rename wbc_account_io() to wbc_account_cgroup_owner()
...
- Standardize parameter checking for the SETFLAGS and FSSETXATTR ioctls
(which were the file attribute setters for ext4 and xfs and have now
been hoisted to the vfs)
- Only allow the DAX flag to be set on files and directories.
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Merge tag 'vfs-fix-ioctl-checking-3' of git://git.kernel.org/pub/scm/fs/xfs/xfs-linux
Pull common SETFLAGS/FSSETXATTR parameter checking from Darrick Wong:
"Here's a patch series that sets up common parameter checking functions
for the FS_IOC_SETFLAGS and FS_IOC_FSSETXATTR ioctl implementations.
The goal here is to reduce the amount of behaviorial variance between
the filesystems where those ioctls originated (ext2 and XFS,
respectively) and everybody else.
- Standardize parameter checking for the SETFLAGS and FSSETXATTR
ioctls (which were the file attribute setters for ext4 and xfs and
have now been hoisted to the vfs)
- Only allow the DAX flag to be set on files and directories"
* tag 'vfs-fix-ioctl-checking-3' of git://git.kernel.org/pub/scm/fs/xfs/xfs-linux:
vfs: only allow FSSETXATTR to set DAX flag on files and dirs
vfs: teach vfs_ioc_fssetxattr_check to check extent size hints
vfs: teach vfs_ioc_fssetxattr_check to check project id info
vfs: create a generic checking function for FS_IOC_FSSETXATTR
vfs: create a generic checking and prep function for FS_IOC_SETFLAGS
lookups.
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Merge tag 'ext4_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4
Pull ext4 updates from Ted Ts'o:
"Many bug fixes and cleanups, and an optimization for case-insensitive
lookups"
* tag 'ext4_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4:
ext4: fix coverity warning on error path of filename setup
ext4: replace ktype default_attrs with default_groups
ext4: rename htree_inline_dir_to_tree() to ext4_inlinedir_to_tree()
ext4: refactor initialize_dirent_tail()
ext4: rename "dirent_csum" functions to use "dirblock"
ext4: allow directory holes
jbd2: drop declaration of journal_sync_buffer()
ext4: use jbd2_inode dirty range scoping
jbd2: introduce jbd2_inode dirty range scoping
mm: add filemap_fdatawait_range_keep_errors()
ext4: remove redundant assignment to node
ext4: optimize case-insensitive lookups
ext4: make __ext4_get_inode_loc plug
ext4: clean up kerneldoc warnigns when building with W=1
ext4: only set project inherit bit for directory
ext4: enforce the immutable flag on open files
ext4: don't allow any modifications to an immutable file
jbd2: fix typo in comment of journal_submit_inode_data_buffers
jbd2: fix some print format mistakes
ext4: gracefully handle ext4_break_layouts() failure during truncate
wbc_account_io() does a very specific job - try to see which cgroup is
actually dirtying an inode and transfer its ownership to the majority
dirtier if needed. The name is too generic and confusing. Let's
rename it to something more specific.
Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Dont support 'MAP_SYNC' with non-DAX files and DAX files
with asynchronous dax_device. Virtio pmem provides
asynchronous host page cache flush mechanism. We don't
support 'MAP_SYNC' with virtio pmem and ext4.
Signed-off-by: Pankaj Gupta <pagupta@redhat.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
The kobj_type default_attrs field is being replaced by the
default_groups field. Replace the default_attrs field in ext4_sb_ktype
and ext4_feat_ktype with default_groups. Use the ATTRIBUTE_GROUPS macro
to create ext4_groups and ext4_feat_groups.
Signed-off-by: Kimberly Brown <kimbrownkd@gmail.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Create a generic checking function for the incoming FS_IOC_FSSETXATTR
fsxattr values so that we can standardize some of the implementation
behaviors.
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Create a generic function to check incoming FS_IOC_SETFLAGS flag values
and later prepare the inode for updates so that we can standardize the
implementations that follow ext4's flag values.
Note that the efivarfs implementation no longer fails a no-op SETFLAGS
without CAP_LINUX_IMMUTABLE since that's the behavior in ext*.
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Acked-by: David Sterba <dsterba@suse.com>
Reviewed-by: Bob Peterson <rpeterso@redhat.com>
Move the calculation of the location of the dirent tail into
initialize_dirent_tail(). Also prefix the function with ext4_ to fix
kernel namepsace polution.
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Functions such as ext4_dirent_csum_verify() and ext4_dirent_csum_set()
don't actually operate on a directory entry, but a directory block.
And while they take a struct ext4_dir_entry *dirent as an argument, it
had better be the first directory at the beginning of the direct
block, or things will go very wrong.
Rename the following functions so that things make more sense, and
remove a lot of confusing casts along the way:
ext4_dirent_csum_verify -> ext4_dirblock_csum_verify
ext4_dirent_csum_set -> ext4_dirblock_csum_set
ext4_dirent_csum -> ext4_dirblock_csum
ext4_handle_dirty_dirent_node -> ext4_handle_dirty_dirblock
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
The largedir feature was intended to allow ext4 directories to have
unmapped directory blocks (e.g., directory holes). And so the
released e2fsprogs no longer enforces this for largedir file systems;
however, the corresponding change to the kernel-side code was not made.
This commit fixes this oversight.
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Cc: stable@kernel.org
Use the newly introduced jbd2_inode dirty range scoping to prevent us
from waiting forever when trying to complete a journal transaction.
Signed-off-by: Ross Zwisler <zwisler@google.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Reviewed-by: Jan Kara <jack@suse.cz>
Cc: stable@vger.kernel.org
Pointer 'node' is assigned a value that is never read, node is
later overwritten when it re-assigned a different value inside
the while-loop. The assignment is redundant and can be removed.
Addresses-Coverity: ("Unused value")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Reviewed-by: Jan Kara <jack@suse.cz>
Temporarily cache a casefolded version of the file name under lookup in
ext4_filename, to avoid repeatedly casefolding it. I got up to 30%
speedup on lookups of large directories (>100k entries), depending on
the length of the string under lookup.
Signed-off-by: Gabriel Krisman Bertazi <krisman@collabora.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Add a blk_plug to prevent the inode table readahead from being
submitted as small I/O requests.
Signed-off-by: zhangjs <zachary@baishancloud.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Reviewed-by: Jan Kara <jack@suse.cz>
It doesn't make any sense to have project inherit bits
for regular files, even though this won't cause any
problem, but it is better fix this.
Signed-off-by: Wang Shilong <wshilong@ddn.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Andreas Dilger <adilger@dilger.ca>
According to the chattr man page, "a file with the 'i' attribute
cannot be modified..." Historically, this was only enforced when the
file was opened, per the rest of the description, "... and the file
can not be opened in write mode".
There is general agreement that we should standardize all file systems
to prevent modifications even for files that were opened at the time
the immutable flag is set. Eventually, a change to enforce this at
the VFS layer should be landing in mainline. Until then, enforce this
at the ext4 level to prevent xfstests generic/553 from failing.
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Cc: "Darrick J. Wong" <darrick.wong@oracle.com>
Cc: stable@kernel.org
Don't allow any modifications to a file that's marked immutable, which
means that we have to flush all the writable pages to make the readonly
and we have to check the setattr/setflags parameters more closely.
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Cc: stable@kernel.org
ext4_break_layouts() may fail e.g. due to a signal being delivered.
Thus we need to handle its failure gracefully and not by taking the
filesystem down. Currently ext4_break_layouts() failure is rare but it
may become more common once RDMA uses layout leases for handling
long-term page pins for DAX mappings.
To handle the failure we need to move ext4_break_layouts() earlier
during setattr handling before we do hard to undo changes such as
modifying inode size. To be able to do that we also have to move some
other checks which are better done without holding i_mmap_sem earlier.
Reported-and-tested-by: Ira Weiny <ira.weiny@intel.com>
Reviewed-by: Ira Weiny <ira.weiny@intel.com>
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
As an optimization, don't encrypt blocks fully beyond i_size, since
those definitely won't need to be written out. Also add a comment.
This is in preparation for allowing encryption on ext4 filesystems with
blocksize != PAGE_SIZE.
This is based on work by Chandan Rajendra.
Reviewed-by: Chandan Rajendra <chandan@linux.ibm.com>
Signed-off-by: Eric Biggers <ebiggers@google.com>
In __ext4_block_zero_page_range(), only decrypt the block that actually
needs to be decrypted, rather than assuming blocksize == PAGE_SIZE and
decrypting the whole page.
This is in preparation for allowing encryption on ext4 filesystems with
blocksize != PAGE_SIZE.
Signed-off-by: Chandan Rajendra <chandan@linux.ibm.com>
(EB: rebase onto previous changes, improve the commit message, and use
bh_offset())
Signed-off-by: Eric Biggers <ebiggers@google.com>
In ext4_block_write_begin(), only decrypt the blocks that actually need
to be decrypted (up to two blocks which intersect the boundaries of the
region that will be written to), rather than assuming blocksize ==
PAGE_SIZE and decrypting the whole page.
This is in preparation for allowing encryption on ext4 filesystems with
blocksize != PAGE_SIZE.
Signed-off-by: Chandan Rajendra <chandan@linux.ibm.com>
(EB: rebase onto previous changes, improve the commit message,
and move the check for encrypted inode)
Signed-off-by: Eric Biggers <ebiggers@google.com>
If decryption fails, ext4_block_write_begin() can return with the page's
buffer_head marked with the BH_Uptodate flag. This commit clears the
BH_Uptodate flag in such cases.
Signed-off-by: Chandan Rajendra <chandan@linux.ibm.com>
Signed-off-by: Eric Biggers <ebiggers@google.com>
Rename fscrypt_decrypt_page() to fscrypt_decrypt_pagecache_blocks() and
redefine its behavior to decrypt all filesystem blocks in the given
region of the given page, rather than assuming that the region consists
of just one filesystem block. Also remove the 'inode' and 'lblk_num'
parameters, since they can be retrieved from the page as it's already
assumed to be a pagecache page.
This is in preparation for allowing encryption on ext4 filesystems with
blocksize != PAGE_SIZE.
This is based on work by Chandan Rajendra.
Reviewed-by: Chandan Rajendra <chandan@linux.ibm.com>
Signed-off-by: Eric Biggers <ebiggers@google.com>
Rename fscrypt_encrypt_page() to fscrypt_encrypt_pagecache_blocks() and
redefine its behavior to encrypt all filesystem blocks from the given
region of the given page, rather than assuming that the region consists
of just one filesystem block. Also remove the 'inode' and 'lblk_num'
parameters, since they can be retrieved from the page as it's already
assumed to be a pagecache page.
This is in preparation for allowing encryption on ext4 filesystems with
blocksize != PAGE_SIZE.
This is based on work by Chandan Rajendra.
Reviewed-by: Chandan Rajendra <chandan@linux.ibm.com>
Signed-off-by: Eric Biggers <ebiggers@google.com>
Currently, bounce page handling for writes to encrypted files is
unnecessarily complicated. A fscrypt_ctx is allocated along with each
bounce page, page_private(bounce_page) points to this fscrypt_ctx, and
fscrypt_ctx::w::control_page points to the original pagecache page.
However, because writes don't use the fscrypt_ctx for anything else,
there's no reason why page_private(bounce_page) can't just point to the
original pagecache page directly.
Therefore, this patch makes this change. In the process, it also cleans
up the API exposed to filesystems that allows testing whether a page is
a bounce page, getting the pagecache page from a bounce page, and
freeing a bounce page.
Reviewed-by: Chandan Rajendra <chandan@linux.ibm.com>
Signed-off-by: Eric Biggers <ebiggers@google.com>
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Merge tag 'ext4_for_linus_stable' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4
Pull ext4 fixes from Ted Ts'o:
"Bug fixes (including a regression fix) for ext4"
* tag 'ext4_for_linus_stable' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4:
ext4: fix dcache lookup of !casefolded directories
ext4: do not delete unlinked inode from orphan list on failed truncate
ext4: wait for outstanding dio during truncate in nojournal mode
ext4: don't perform block validity checks on the journal inode
Found by visual inspection, this wasn't caught by my xfstest, since it's
effect is ignoring positive dentries in the cache the fallback just goes
to the disk. it was introduced in the last iteration of the
case-insensitive patch.
d_compare should return 0 when the entries match, so make sure we are
correctly comparing the entire string if the encoding feature is set and
we are on a case-INsensitive directory.
Fixes: b886ee3e77 ("ext4: Support case-insensitive file name lookups")
Signed-off-by: Gabriel Krisman Bertazi <krisman@collabora.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
It is possible that unlinked inode enters ext4_setattr() (e.g. if
somebody calls ftruncate(2) on unlinked but still open file). In such
case we should not delete the inode from the orphan list if truncate
fails. Note that this is mostly a theoretical concern as filesystem is
corrupted if we reach this path anyway but let's be consistent in our
orphan handling.
Reviewed-by: Ira Weiny <ira.weiny@intel.com>
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Cc: stable@kernel.org
We didn't wait for outstanding direct IO during truncate in nojournal
mode (as we skip orphan handling in that case). This can lead to fs
corruption or stale data exposure if truncate ends up freeing blocks
and these get reallocated before direct IO finishes. Fix the condition
determining whether the wait is necessary.
CC: stable@vger.kernel.org
Fixes: 1c9114f9c0 ("ext4: serialize unlocked dio reads with truncate")
Reviewed-by: Ira Weiny <ira.weiny@intel.com>
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Since the journal inode is already checked when we added it to the
block validity's system zone, if we check it again, we'll just trigger
a failure.
This was causing failures like this:
[ 53.897001] EXT4-fs error (device sda): ext4_find_extent:909: inode
#8: comm jbd2/sda-8: pblk 121667583 bad header/extent: invalid extent entries - magic f30a, entries 8, max 340(340), depth 0(0)
[ 53.931430] jbd2_journal_bmap: journal block not found at offset 49 on sda-8
[ 53.938480] Aborting journal on device sda-8.
... but only if the system was under enough memory pressure that
logical->physical mapping for the journal inode gets pushed out of the
extent cache. (This is why it wasn't noticed earlier.)
Fixes: 345c0dbf3a ("ext4: protect journal inode's blocks using block_validity")
Reported-by: Dan Rue <dan.rue@linaro.org>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Tested-by: Naresh Kamboju <naresh.kamboju@linaro.org>
Add SPDX license identifiers to all Make/Kconfig files which:
- Have no license information of any form
These files fall under the project license, GPL v2 only. The resulting SPDX
license identifier is:
GPL-2.0-only
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Unicode 12.1.0.
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Merge tag 'ext4_for_linus_stable' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4
Pull ext4 fixes from Ted Ts'o:
"Some bug fixes, and an update to the URL's for the final version of
Unicode 12.1.0"
* tag 'ext4_for_linus_stable' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4:
ext4: avoid panic during forced reboot due to aborted journal
ext4: fix block validity checks for journal inodes using indirect blocks
unicode: update to Unicode 12.1.0 final
unicode: add missing check for an error return from utf8lookup()
ext4: fix miscellaneous sparse warnings
ext4: unsigned int compared against zero
ext4: fix use-after-free in dx_release()
ext4: fix data corruption caused by overlapping unaligned and aligned IO
jbd2: fix potential double free
ext4: zero out the unused memory region in the extent tree block
Handling of aborted journal is a special code path different from
standard ext4_error() one and it can call panic() as well. Commit
1dc1097ff6 ("ext4: avoid panic during forced reboot") forgot to update
this path so fix that omission.
Fixes: 1dc1097ff6 ("ext4: avoid panic during forced reboot")
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Cc: stable@kernel.org # 5.1
Commit 345c0dbf3a ("ext4: protect journal inode's blocks using
block_validity") failed to add an exception for the journal inode in
ext4_check_blockref(), which is the function used by ext4_get_branch()
for indirect blocks. This caused attempts to read from the ext3-style
journals to fail with:
[ 848.968550] EXT4-fs error (device sdb7): ext4_get_branch:171: inode #8: block 30343695: comm jbd2/sdb7-8: invalid block
Fix this by adding the missing exception check.
Fixes: 345c0dbf3a ("ext4: protect journal inode's blocks using block_validity")
Reported-by: Arthur Marsh <arthur.marsh@internode.on.net>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
There are two cases where u32 variables n and err are being checked
for less than zero error values, the checks is always false because
the variables are not signed. Fix this by making the variables ints.
Addresses-Coverity: ("Unsigned compared against 0")
Fixes: 345c0dbf3a ("ext4: protect journal inode's blocks using block_validity")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
The buffer_head (frames[0].bh) and it's corresping page can be
potentially free'd once brelse() is done inside the for loop
but before the for loop exits in dx_release(). It can be free'd
in another context, when the page cache is flushed via
drop_caches_sysctl_handler(). This results into below data abort
when accessing info->indirect_levels in dx_release().
Unable to handle kernel paging request at virtual address ffffffc17ac3e01e
Call trace:
dx_release+0x70/0x90
ext4_htree_fill_tree+0x2d4/0x300
ext4_readdir+0x244/0x6f8
iterate_dir+0xbc/0x160
SyS_getdents64+0x94/0x174
Signed-off-by: Sahitya Tummala <stummala@codeaurora.org>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Reviewed-by: Andreas Dilger <adilger@dilger.ca>
Cc: stable@kernel.org
