Set the eCryptfs superblock time granularity, using the lower
filesystem's s_time_gran value, to prevent unnecessary inode timestamp
truncation to the granularity of a full second.
The use of utimensat(2) to set a timestamp with nanosecond precision
would trigger this bug. That occurred when using the following utilities
to update timestamps of a file:
* cp -p: copy a file and preserve its atime and mtime
* touch -r: touch a file and use a reference file's timestamps
Closes: https://bugs.launchpad.net/ecryptfs/+bug/1890486
Signed-off-by: Frank Hsiao 蕭法宣 <frankhsiao@qnap.com>
[tyhicks: Partially rewrite the commit message]
Signed-off-by: Tyler Hicks <code@tyhicks.com>
This was done entirely with mindless brute force, using
git grep -l '\<k[vmz]*alloc_objs*(.*, GFP_KERNEL)' |
xargs sed -i 's/\(alloc_objs*(.*\), GFP_KERNEL)/\1)/'
to convert the new alloc_obj() users that had a simple GFP_KERNEL
argument to just drop that argument.
Note that due to the extreme simplicity of the scripting, any slightly
more complex cases spread over multiple lines would not be triggered:
they definitely exist, but this covers the vast bulk of the cases, and
the resulting diff is also then easier to check automatically.
For the same reason the 'flex' versions will be done as a separate
conversion.
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This is the result of running the Coccinelle script from
scripts/coccinelle/api/kmalloc_objs.cocci. The script is designed to
avoid scalar types (which need careful case-by-case checking), and
instead replace kmalloc-family calls that allocate struct or union
object instances:
Single allocations: kmalloc(sizeof(TYPE), ...)
are replaced with: kmalloc_obj(TYPE, ...)
Array allocations: kmalloc_array(COUNT, sizeof(TYPE), ...)
are replaced with: kmalloc_objs(TYPE, COUNT, ...)
Flex array allocations: kmalloc(struct_size(PTR, FAM, COUNT), ...)
are replaced with: kmalloc_flex(*PTR, FAM, COUNT, ...)
(where TYPE may also be *VAR)
The resulting allocations no longer return "void *", instead returning
"TYPE *".
Signed-off-by: Kees Cook <kees@kernel.org>
eCryptfs uses MD5 for a couple unusual purposes: to "mix" the key into
the IVs for file contents encryption (similar to ESSIV), and to prepend
some key-dependent bytes to the plaintext when encrypting filenames
(which is useless since eCryptfs encrypts the filenames with ECB).
Currently, eCryptfs computes these MD5 hashes using the crypto_shash
API. Update it to instead use the MD5 library API. This is simpler and
faster: the library doesn't require memory allocations, can't fail, and
provides direct access to MD5 without overhead such as indirect calls.
To preserve the existing behavior of eCryptfs support being disabled
when the kernel is booted with "fips=1", make ecryptfs_get_tree() check
fips_enabled itself. Previously it relied on crypto_alloc_shash("md5")
failing. I don't know for sure that this is actually needed; e.g., it
could be argued that eCryptfs's use of MD5 isn't for a security purpose
as far as FIPS is concerned. But this preserves the existing behavior.
Tested by verifying that an existing eCryptfs can still be mounted with
a kernel that has this commit, with all the files matching. Also tested
creating a filesystem with this commit and mounting+reading it without.
Signed-off-by: Eric Biggers <ebiggers@kernel.org>
Link: https://patch.msgid.link/20251011200010.193140-1-ebiggers@kernel.org
Acked-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Christian Brauner <brauner@kernel.org>
->lower_path.mnt has the same value for all dentries on given ecryptfs
instance and if somebody goes for mountpoint-crossing variant where that
would not be true, we can deal with that when it happens (and _not_
with duplicating these reference into each dentry).
As it is, we are better off just sticking a reference into ecryptfs-private
part of superblock and keeping it pinned until ->kill_sb().
That way we can stick a reference to underlying dentry right into ->d_fsdata
of ecryptfs one, getting rid of indirection through struct ecryptfs_dentry_info,
along with the entire struct ecryptfs_dentry_info machinery.
[kudos to Dan Carpenter for spotting a bug in ecryptfs_get_tree() part]
Reviewed-by: Christian Brauner <brauner@kernel.org>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Pull misc VFS updates from Christian Brauner:
"This contains the usual selections of misc updates for this cycle.
Features:
- Add ext4 IOCB_DONTCACHE support
This refactors the address_space_operations write_begin() and
write_end() callbacks to take const struct kiocb * as their first
argument, allowing IOCB flags such as IOCB_DONTCACHE to propagate
to the filesystem's buffered I/O path.
Ext4 is updated to implement handling of the IOCB_DONTCACHE flag
and advertises support via the FOP_DONTCACHE file operation flag.
Additionally, the i915 driver's shmem write paths are updated to
bypass the legacy write_begin/write_end interface in favor of
directly calling write_iter() with a constructed synchronous kiocb.
Another i915 change replaces a manual write loop with
kernel_write() during GEM shmem object creation.
Cleanups:
- don't duplicate vfs_open() in kernel_file_open()
- proc_fd_getattr(): don't bother with S_ISDIR() check
- fs/ecryptfs: replace snprintf with sysfs_emit in show function
- vfs: Remove unnecessary list_for_each_entry_safe() from
evict_inodes()
- filelock: add new locks_wake_up_waiter() helper
- fs: Remove three arguments from block_write_end()
- VFS: change old_dir and new_dir in struct renamedata to dentrys
- netfs: Remove unused declaration netfs_queue_write_request()
Fixes:
- eventpoll: Fix semi-unbounded recursion
- eventpoll: fix sphinx documentation build warning
- fs/read_write: Fix spelling typo
- fs: annotate data race between poll_schedule_timeout() and
pollwake()
- fs/pipe: set FMODE_NOWAIT in create_pipe_files()
- docs/vfs: update references to i_mutex to i_rwsem
- fs/buffer: remove comment about hard sectorsize
- fs/buffer: remove the min and max limit checks in __getblk_slow()
- fs/libfs: don't assume blocksize <= PAGE_SIZE in
generic_check_addressable
- fs_context: fix parameter name in infofc() macro
- fs: Prevent file descriptor table allocations exceeding INT_MAX"
* tag 'vfs-6.17-rc1.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs: (24 commits)
netfs: Remove unused declaration netfs_queue_write_request()
eventpoll: fix sphinx documentation build warning
ext4: support uncached buffered I/O
mm/pagemap: add write_begin_get_folio() helper function
fs: change write_begin/write_end interface to take struct kiocb *
drm/i915: Refactor shmem_pwrite() to use kiocb and write_iter
drm/i915: Use kernel_write() in shmem object create
eventpoll: Fix semi-unbounded recursion
vfs: Remove unnecessary list_for_each_entry_safe() from evict_inodes()
fs/libfs: don't assume blocksize <= PAGE_SIZE in generic_check_addressable
fs/buffer: remove the min and max limit checks in __getblk_slow()
fs: Prevent file descriptor table allocations exceeding INT_MAX
fs: Remove three arguments from block_write_end()
fs/ecryptfs: replace snprintf with sysfs_emit in show function
fs: annotate suspected data race between poll_schedule_timeout() and pollwake()
docs/vfs: update references to i_mutex to i_rwsem
fs/buffer: remove comment about hard sectorsize
fs_context: fix parameter name in infofc() macro
VFS: change old_dir and new_dir in struct renamedata to dentrys
proc_fd_getattr(): don't bother with S_ISDIR() check
...
... to be used instead of manually assigning to ->s_d_op.
All in-tree filesystem converted (and field itself is renamed,
so any out-of-tree ones in need of conversion will be caught
by compiler).
Reviewed-by: Christian Brauner <brauner@kernel.org>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Under the new mount API, mount options are parsed one at a time.
Any validation that examines multiple options must be done after parsing
is complete, so factor out a ecryptfs_validate_options() which can be
called separately.
To facilitate this, temporarily move the local variables that tracked
whether various options have been set in the parsing function, into the
ecryptfs_mount_crypt_stat structure so that they can be examined later.
These will be moved to a more ephemeral struct in the mount api conversion
patch to follow.
Signed-off-by: Eric Sandeen <sandeen@redhat.com>
Link: https://lore.kernel.org/r/20241028143359.605061-2-sandeen@redhat.com
Acked-by: Tyler Hicks <code@tyhicks.com>
Signed-off-by: Christian Brauner <brauner@kernel.org>
When mounting eCryptfs, a null "dev_name" argument to ecryptfs_mount()
causes a kernel panic if the parsed options are valid. The easiest way to
reproduce this is to call mount() from userspace with an existing
eCryptfs mount's options and a "source" argument of 0.
Error out if "dev_name" is null in ecryptfs_mount()
Fixes: 237fead619 ("[PATCH] ecryptfs: fs/Makefile and fs/Kconfig")
Cc: stable@vger.kernel.org
Signed-off-by: Jeffrey Mitchell <jeffrey.mitchell@starlab.io>
Signed-off-by: Tyler Hicks <code@tyhicks.com>
Fixes the following W=1 kernel build warning(s):
fs/ecryptfs/main.c:28: warning: Incorrect use of kernel-doc format: * Module parameter that defines the ecryptfs_verbosity level.
fs/ecryptfs/main.c:30: warning: cannot understand function prototype: 'int ecryptfs_verbosity = 0; '
fs/ecryptfs/main.c:40: warning: cannot understand function prototype: 'unsigned int ecryptfs_message_buf_len = ECRYPTFS_DEFAULT_MSG_CTX_ELEMS; '
fs/ecryptfs/main.c:52: warning: cannot understand function prototype: 'signed long ecryptfs_message_wait_timeout = ECRYPTFS_MAX_MSG_CTX_TTL / HZ; '
fs/ecryptfs/main.c:65: warning: cannot understand function prototype: 'unsigned int ecryptfs_number_of_users = ECRYPTFS_DEFAULT_NUM_USERS; '
fs/ecryptfs/main.c:106: warning: Function parameter or member 'dentry' not described in 'ecryptfs_init_lower_file'
fs/ecryptfs/main.c:106: warning: Function parameter or member 'lower_file' not described in 'ecryptfs_init_lower_file'
fs/ecryptfs/main.c:106: warning: Excess function parameter 'ecryptfs_dentry' description in 'ecryptfs_init_lower_file'
fs/ecryptfs/main.c:244: warning: Function parameter or member 'sbi' not described in 'ecryptfs_parse_options'
fs/ecryptfs/main.c:244: warning: Excess function parameter 'sb' description in 'ecryptfs_parse_options'
fs/ecryptfs/main.c:478: warning: Function parameter or member 'fs_type' not described in 'ecryptfs_mount'
fs/ecryptfs/main.c:478: warning: Function parameter or member 'flags' not described in 'ecryptfs_mount'
fs/ecryptfs/main.c:478: warning: expecting prototype for ecryptfs_get_sb(). Prototype was for ecryptfs_mount() instead
fs/ecryptfs/main.c:645: warning: Function parameter or member 'vptr' not described in 'inode_info_init_once'
Cc: Tyler Hicks <code@tyhicks.com>
Cc: Christian Brauner <christian.brauner@ubuntu.com>
Cc: James Morris <jamorris@linux.microsoft.com>
Cc: "Michael A. Halcrow" <mahalcro@us.ibm.com>
Cc: "Michael C. Thompson" <mcthomps@us.ibm.com>
Cc: ecryptfs@vger.kernel.org
Signed-off-by: Lee Jones <lee.jones@linaro.org>
[tyhicks: Correct the function documentation for ecryptfs_mount()]
Signed-off-by: Tyler Hicks <code@tyhicks.com>
Replace a recently deactived email address with one that I'll be able to
personally control and keep alive.
Signed-off-by: Tyler Hicks <code@tyhicks.com>
Based on 1 normalized pattern(s):
this program is free software you can redistribute it and or modify
it under the terms of the gnu general public license as published by
the free software foundation either version 2 of the license or at
your option any later version this program is distributed in the
hope that it will be useful but without any warranty without even
the implied warranty of merchantability or fitness for a particular
purpose see the gnu general public license for more details you
should have received a copy of the gnu general public license along
with this program if not write to the free software foundation inc
59 temple place suite 330 boston ma 02111 1307 usa
extracted by the scancode license scanner the SPDX license identifier
GPL-2.0-or-later
has been chosen to replace the boilerplate/reference in 1334 file(s).
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Allison Randal <allison@lohutok.net>
Reviewed-by: Richard Fontana <rfontana@redhat.com>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190527070033.113240726@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This is a pure automated search-and-replace of the internal kernel
superblock flags.
The s_flags are now called SB_*, with the names and the values for the
moment mirroring the MS_* flags that they're equivalent to.
Note how the MS_xyz flags are the ones passed to the mount system call,
while the SB_xyz flags are what we then use in sb->s_flags.
The script to do this was:
# places to look in; re security/*: it generally should *not* be
# touched (that stuff parses mount(2) arguments directly), but
# there are two places where we really deal with superblock flags.
FILES="drivers/mtd drivers/staging/lustre fs ipc mm \
include/linux/fs.h include/uapi/linux/bfs_fs.h \
security/apparmor/apparmorfs.c security/apparmor/include/lib.h"
# the list of MS_... constants
SYMS="RDONLY NOSUID NODEV NOEXEC SYNCHRONOUS REMOUNT MANDLOCK \
DIRSYNC NOATIME NODIRATIME BIND MOVE REC VERBOSE SILENT \
POSIXACL UNBINDABLE PRIVATE SLAVE SHARED RELATIME KERNMOUNT \
I_VERSION STRICTATIME LAZYTIME SUBMOUNT NOREMOTELOCK NOSEC BORN \
ACTIVE NOUSER"
SED_PROG=
for i in $SYMS; do SED_PROG="$SED_PROG -e s/MS_$i/SB_$i/g"; done
# we want files that contain at least one of MS_...,
# with fs/namespace.c and fs/pnode.c excluded.
L=$(for i in $SYMS; do git grep -w -l MS_$i $FILES; done| sort|uniq|grep -v '^fs/namespace.c'|grep -v '^fs/pnode.c')
for f in $L; do sed -i $f $SED_PROG; done
Requested-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Pull eCryptfs updates from Tyler Hicks:
- miscellaneous code cleanups and refactoring
- fix a possible use after free bug when unloading the module
* tag 'ecryptfs-4.15-rc1-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tyhicks/ecryptfs:
eCryptfs: constify attribute_group structures.
ecryptfs: remove unnecessary i_version bump
ecryptfs: use ARRAY_SIZE
ecryptfs: Adjust four checks for null pointers
ecryptfs: Return an error code only as a constant in ecryptfs_add_global_auth_tok()
ecryptfs: Delete 21 error messages for a failed memory allocation
eCryptfs: use after free in ecryptfs_release_messaging()
ecryptfs: remove private bin2hex implementation
ecryptfs: add missing \n to end of various error messages
attribute_groups are not supposed to change at runtime. All functions
working with attribute_groups provided by <linux/sysfs.h> work with const
attribute_group. So mark the non-const structs as const.
File size before:
text data bss dec hex filename
6122 636 24 6782 1a7e fs/ecryptfs/main.o
File size After adding 'const':
text data bss dec hex filename
6186 604 24 6814 1a9e fs/ecryptfs/main.o
Signed-off-by: Arvind Yadav <arvind.yadav.cs@gmail.com>
Signed-off-by: Tyler Hicks <tyhicks@canonical.com>
Frank Hsiao 蕭法宣andTyler Hicks
Linus Torvalds
Kees Cook
Thorsten BlumandTyler Hicks
Eric BiggersandChristian Brauner
Al Viro
Ankit ChauhanandChristian Brauner
Colin Ian KingandChristian Brauner
Eric SandeenandChristian Brauner
Justin StittandKees Cook
Christian Brauner
Jeffrey MitchellandTyler Hicks
Lee JonesandTyler Hicks
Thomas GleixnerandGreg Kroah-Hartman
Alexey DobriyanandLinus Torvalds
Arvind YadavandTyler Hicks
Colin Ian KingandTyler Hicks