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2017-05-13Merge tag 'upstream-4.12-rc1' of git://git.infradead.org/linux-ubifsLinus Torvalds
Pull UBI/UBIFS updates from Richard Weinberger: - new config option CONFIG_UBIFS_FS_SECURITY - minor improvements - random fixes * tag 'upstream-4.12-rc1' of git://git.infradead.org/linux-ubifs: ubi: Add debugfs file for tracking PEB state ubifs: Fix a typo in comment of ioctl2ubifs & ubifs2ioctl ubifs: Remove unnecessary assignment ubifs: Fix cut and paste error on sb type comparisons ubi: fastmap: Fix slab corruption ubifs: Add CONFIG_UBIFS_FS_SECURITY to disable/enable security labels ubi: Make mtd parameter readable ubi: Fix section mismatch
2017-05-08Merge branch 'akpm' (patches from Andrew)Linus Torvalds
Merge more updates from Andrew Morton: - the rest of MM - various misc things - procfs updates - lib/ updates - checkpatch updates - kdump/kexec updates - add kvmalloc helpers, use them - time helper updates for Y2038 issues. We're almost ready to remove current_fs_time() but that awaits a btrfs merge. - add tracepoints to DAX * emailed patches from Andrew Morton <akpm@linux-foundation.org>: (114 commits) drivers/staging/ccree/ssi_hash.c: fix build with gcc-4.4.4 selftests/vm: add a test for virtual address range mapping dax: add tracepoint to dax_insert_mapping() dax: add tracepoint to dax_writeback_one() dax: add tracepoints to dax_writeback_mapping_range() dax: add tracepoints to dax_load_hole() dax: add tracepoints to dax_pfn_mkwrite() dax: add tracepoints to dax_iomap_pte_fault() mtd: nand: nandsim: convert to memalloc_noreclaim_*() treewide: convert PF_MEMALLOC manipulations to new helpers mm: introduce memalloc_noreclaim_{save,restore} mm: prevent potential recursive reclaim due to clearing PF_MEMALLOC mm/huge_memory.c: deposit a pgtable for DAX PMD faults when required mm/huge_memory.c: use zap_deposited_table() more time: delete CURRENT_TIME_SEC and CURRENT_TIME gfs2: replace CURRENT_TIME with current_time apparmorfs: replace CURRENT_TIME with current_time() lustre: replace CURRENT_TIME macro fs: ubifs: replace CURRENT_TIME_SEC with current_time fs: ufs: use ktime_get_real_ts64() for birthtime ...
2017-05-08fs: ubifs: replace CURRENT_TIME_SEC with current_timeDeepa Dinamani
CURRENT_TIME_SEC is not y2038 safe. current_time() will be transitioned to use 64 bit time along with vfs in a separate patch. There is no plan to transition CURRENT_TIME_SEC to use y2038 safe time interfaces. current_time() returns timestamps according to the granularities set in the inode's super_block. The granularity check to call current_fs_time() or CURRENT_TIME_SEC is not required. Use current_time() directly to update inode timestamp. Use timespec_trunc during file system creation, before the first inode is created. Link: http://lkml.kernel.org/r/1491613030-11599-9-git-send-email-deepa.kernel@gmail.com Signed-off-by: Deepa Dinamani <deepa.kernel@gmail.com> Reviewed-by: Arnd Bergmann <arnd@arndb.de> Cc: Richard Weinberger <richard@nod.at> Cc: Artem Bityutskiy <dedekind1@gmail.com> Cc: Adrian Hunter <adrian.hunter@intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2017-05-08ubifs: Fix a typo in comment of ioctl2ubifs & ubifs2ioctlRock Lee
Change 'convert' to 'converts' Change 'UBIFS' to 'UBIFS inode flags' Signed-off-by: Rock Lee <rockdotlee@gmail.com> Signed-off-by: Richard Weinberger <richard@nod.at>
2017-05-08ubifs: Remove unnecessary assignmentStefan Agner
Assigning a value of a variable to itself is not useful. Signed-off-by: Stefan Agner <stefan@agner.ch> Signed-off-by: Richard Weinberger <richard@nod.at>
2017-05-08ubifs: Fix cut and paste error on sb type comparisonsColin Ian King
The check for the bad node type of sb->type is checking sa->type and not sb-type. This looks like a cut and paste error. Fix this. Detected by PVS-Studio, warning: V581 Signed-off-by: Colin Ian King <colin.king@canonical.com> Signed-off-by: Richard Weinberger <richard@nod.at>
2017-05-08ubifs: Add CONFIG_UBIFS_FS_SECURITY to disable/enable security labelsHyunchul Lee
When write syscall is called, every time security label is searched to determine that file's privileges should be changed. If LSM(Linux Security Model) is not used, this is useless. So introduce CONFIG_UBIFS_SECURITY to disable security labels. it's default value is "y". Signed-off-by: Hyunchul Lee <cheol.lee@lge.com> Signed-off-by: Richard Weinberger <richard@nod.at>
2017-05-08Merge tag 'fscrypt_for_linus' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/tytso/fscrypt Pull fscrypt updates from Ted Ts'o: "Only bug fixes and cleanups for this merge window" * tag 'fscrypt_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/fscrypt: fscrypt: correct collision claim for digested names MAINTAINERS: fscrypt: update mailing list, patchwork, and git ext4: clean up ext4_match() and callers f2fs: switch to using fscrypt_match_name() ext4: switch to using fscrypt_match_name() fscrypt: introduce helper function for filename matching fscrypt: avoid collisions when presenting long encrypted filenames f2fs: check entire encrypted bigname when finding a dentry ubifs: check for consistent encryption contexts in ubifs_lookup() f2fs: sync f2fs_lookup() with ext4_lookup() ext4: remove "nokey" check from ext4_lookup() fscrypt: fix context consistency check when key(s) unavailable fscrypt: Remove __packed from fscrypt_policy fscrypt: Move key structure and constants to uapi fscrypt: remove fscrypt_symlink_data_len() fscrypt: remove unnecessary checks for NULL operations
2017-05-04ubifs: check for consistent encryption contexts in ubifs_lookup()Eric Biggers
As ext4 and f2fs do, ubifs should check for consistent encryption contexts during ->lookup() in an encrypted directory. This protects certain users of filesystem encryption against certain types of offline attacks. Signed-off-by: Eric Biggers <ebiggers@google.com> Signed-off-by: Theodore Ts'o <tytso@mit.edu>
2017-05-01Merge branch 'for-4.12/block' of git://git.kernel.dk/linux-blockLinus Torvalds
Pull block layer updates from Jens Axboe: - Add BFQ IO scheduler under the new blk-mq scheduling framework. BFQ was initially a fork of CFQ, but subsequently changed to implement fairness based on B-WF2Q+, a modified variant of WF2Q. BFQ is meant to be used on desktop type single drives, providing good fairness. From Paolo. - Add Kyber IO scheduler. This is a full multiqueue aware scheduler, using a scalable token based algorithm that throttles IO based on live completion IO stats, similary to blk-wbt. From Omar. - A series from Jan, moving users to separately allocated backing devices. This continues the work of separating backing device life times, solving various problems with hot removal. - A series of updates for lightnvm, mostly from Javier. Includes a 'pblk' target that exposes an open channel SSD as a physical block device. - A series of fixes and improvements for nbd from Josef. - A series from Omar, removing queue sharing between devices on mostly legacy drivers. This helps us clean up other bits, if we know that a queue only has a single device backing. This has been overdue for more than a decade. - Fixes for the blk-stats, and improvements to unify the stats and user windows. This both improves blk-wbt, and enables other users to register a need to receive IO stats for a device. From Omar. - blk-throttle improvements from Shaohua. This provides a scalable framework for implementing scalable priotization - particularly for blk-mq, but applicable to any type of block device. The interface is marked experimental for now. - Bucketized IO stats for IO polling from Stephen Bates. This improves efficiency of polled workloads in the presence of mixed block size IO. - A few fixes for opal, from Scott. - A few pulls for NVMe, including a lot of fixes for NVMe-over-fabrics. From a variety of folks, mostly Sagi and James Smart. - A series from Bart, improving our exposed info and capabilities from the blk-mq debugfs support. - A series from Christoph, cleaning up how handle WRITE_ZEROES. - A series from Christoph, cleaning up the block layer handling of how we track errors in a request. On top of being a nice cleanup, it also shrinks the size of struct request a bit. - Removal of mg_disk and hd (sorry Linus) by Christoph. The former was never used by platforms, and the latter has outlived it's usefulness. - Various little bug fixes and cleanups from a wide variety of folks. * 'for-4.12/block' of git://git.kernel.dk/linux-block: (329 commits) block: hide badblocks attribute by default blk-mq: unify hctx delay_work and run_work block: add kblock_mod_delayed_work_on() blk-mq: unify hctx delayed_run_work and run_work nbd: fix use after free on module unload MAINTAINERS: bfq: Add Paolo as maintainer for the BFQ I/O scheduler blk-mq-sched: alloate reserved tags out of normal pool mtip32xx: use runtime tag to initialize command header scsi: Implement blk_mq_ops.show_rq() blk-mq: Add blk_mq_ops.show_rq() blk-mq: Show operation, cmd_flags and rq_flags names blk-mq: Make blk_flags_show() callers append a newline character blk-mq: Move the "state" debugfs attribute one level down blk-mq: Unregister debugfs attributes earlier blk-mq: Only unregister hctxs for which registration succeeded blk-mq-debugfs: Rename functions for registering and unregistering the mq directory blk-mq: Let blk_mq_debugfs_register() look up the queue name blk-mq: Register <dev>/queue/mq after having registered <dev>/queue ide-pm: always pass 0 error to ide_complete_rq in ide_do_devset ide-pm: always pass 0 error to __blk_end_request_all ..
2017-04-20ubifs: Convert to separately allocated bdiJan Kara
Allocate struct backing_dev_info separately instead of embedding it inside the superblock. This unifies handling of bdi among users. CC: Richard Weinberger <richard@nod.at> CC: Artem Bityutskiy <dedekind1@gmail.com> CC: Adrian Hunter <adrian.hunter@intel.com> CC: linux-mtd@lists.infradead.org Acked-by: Richard Weinberger <richard@nod.at> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jan Kara <jack@suse.cz> Signed-off-by: Jens Axboe <axboe@fb.com>
2017-04-18ubifs: Fix O_TMPFILE corner case in ubifs_link()Richard Weinberger
It is perfectly fine to link a tmpfile back using linkat(). Since tmpfiles are created with a link count of 0 they appear on the orphan list, upon re-linking the inode has to be removed from the orphan list again. Ralph faced a filesystem corruption in combination with overlayfs due to this bug. Cc: <stable@vger.kernel.org> Cc: Ralph Sennhauser <ralph.sennhauser@gmail.com> Cc: Amir Goldstein <amir73il@gmail.com> Reported-by: Ralph Sennhauser <ralph.sennhauser@gmail.com> Tested-by: Ralph Sennhauser <ralph.sennhauser@gmail.com> Reported-by: Amir Goldstein <amir73il@gmail.com> Fixes: 474b93704f321 ("ubifs: Implement O_TMPFILE") Signed-off-by: Richard Weinberger <richard@nod.at>
2017-03-30ubifs: Fix RENAME_WHITEOUT supportFelix Fietkau
Remove faulty leftover check in do_rename(), apparently introduced in a merge that combined whiteout support changes with commit f03b8ad8d386 ("fs: support RENAME_NOREPLACE for local filesystems") Fixes: f03b8ad8d386 ("fs: support RENAME_NOREPLACE for local filesystems") Fixes: 9e0a1fff8db5 ("ubifs: Implement RENAME_WHITEOUT") Cc: stable@vger.kernel.org Signed-off-by: Felix Fietkau <nbd@nbd.name> Signed-off-by: Richard Weinberger <richard@nod.at>
2017-03-30ubifs: Fix debug messages for an invalid filename in ubifs_dump_inodeHyunchul Lee
instead of filenames, print inode numbers, file types, and length. Signed-off-by: Hyunchul Lee <cheol.lee@lge.com> Signed-off-by: Richard Weinberger <richard@nod.at>
2017-03-30ubifs: Fix debug messages for an invalid filename in ubifs_dump_nodeHyunchul Lee
if a character is not printable, print '?' instead of that. Signed-off-by: Hyunchul Lee <cheol.lee@lge.com> Signed-off-by: Richard Weinberger <richard@nod.at>
2017-03-30ubifs: Remove filename from debug messages in ubifs_readdirHyunchul Lee
if filename is encrypted, filename could have no printable characters. so remove it. Signed-off-by: Hyunchul Lee <cheol.lee@lge.com> Signed-off-by: Richard Weinberger <richard@nod.at>
2017-03-30ubifs: Fix memory leak in error path in ubifs_mknodRichard Weinberger
When fscrypt_setup_filename() fails we have to free dev. Signed-off-by: Richard Weinberger <richard@nod.at>
2017-03-02statx: Add a system call to make enhanced file info availableDavid Howells
Add a system call to make extended file information available, including file creation and some attribute flags where available through the underlying filesystem. The getattr inode operation is altered to take two additional arguments: a u32 request_mask and an unsigned int flags that indicate the synchronisation mode. This change is propagated to the vfs_getattr*() function. Functions like vfs_stat() are now inline wrappers around new functions vfs_statx() and vfs_statx_fd() to reduce stack usage. ======== OVERVIEW ======== The idea was initially proposed as a set of xattrs that could be retrieved with getxattr(), but the general preference proved to be for a new syscall with an extended stat structure. A number of requests were gathered for features to be included. The following have been included: (1) Make the fields a consistent size on all arches and make them large. (2) Spare space, request flags and information flags are provided for future expansion. (3) Better support for the y2038 problem [Arnd Bergmann] (tv_sec is an __s64). (4) Creation time: The SMB protocol carries the creation time, which could be exported by Samba, which will in turn help CIFS make use of FS-Cache as that can be used for coherency data (stx_btime). This is also specified in NFSv4 as a recommended attribute and could be exported by NFSD [Steve French]. (5) Lightweight stat: Ask for just those details of interest, and allow a netfs (such as NFS) to approximate anything not of interest, possibly without going to the server [Trond Myklebust, Ulrich Drepper, Andreas Dilger] (AT_STATX_DONT_SYNC). (6) Heavyweight stat: Force a netfs to go to the server, even if it thinks its cached attributes are up to date [Trond Myklebust] (AT_STATX_FORCE_SYNC). And the following have been left out for future extension: (7) Data version number: Could be used by userspace NFS servers [Aneesh Kumar]. Can also be used to modify fill_post_wcc() in NFSD which retrieves i_version directly, but has just called vfs_getattr(). It could get it from the kstat struct if it used vfs_xgetattr() instead. (There's disagreement on the exact semantics of a single field, since not all filesystems do this the same way). (8) BSD stat compatibility: Including more fields from the BSD stat such as creation time (st_btime) and inode generation number (st_gen) [Jeremy Allison, Bernd Schubert]. (9) Inode generation number: Useful for FUSE and userspace NFS servers [Bernd Schubert]. (This was asked for but later deemed unnecessary with the open-by-handle capability available and caused disagreement as to whether it's a security hole or not). (10) Extra coherency data may be useful in making backups [Andreas Dilger]. (No particular data were offered, but things like last backup timestamp, the data version number and the DOS archive bit would come into this category). (11) Allow the filesystem to indicate what it can/cannot provide: A filesystem can now say it doesn't support a standard stat feature if that isn't available, so if, for instance, inode numbers or UIDs don't exist or are fabricated locally... (This requires a separate system call - I have an fsinfo() call idea for this). (12) Store a 16-byte volume ID in the superblock that can be returned in struct xstat [Steve French]. (Deferred to fsinfo). (13) Include granularity fields in the time data to indicate the granularity of each of the times (NFSv4 time_delta) [Steve French]. (Deferred to fsinfo). (14) FS_IOC_GETFLAGS value. These could be translated to BSD's st_flags. Note that the Linux IOC flags are a mess and filesystems such as Ext4 define flags that aren't in linux/fs.h, so translation in the kernel may be a necessity (or, possibly, we provide the filesystem type too). (Some attributes are made available in stx_attributes, but the general feeling was that the IOC flags were to ext[234]-specific and shouldn't be exposed through statx this way). (15) Mask of features available on file (eg: ACLs, seclabel) [Brad Boyer, Michael Kerrisk]. (Deferred, probably to fsinfo. Finding out if there's an ACL or seclabal might require extra filesystem operations). (16) Femtosecond-resolution timestamps [Dave Chinner]. (A __reserved field has been left in the statx_timestamp struct for this - if there proves to be a need). (17) A set multiple attributes syscall to go with this. =============== NEW SYSTEM CALL =============== The new system call is: int ret = statx(int dfd, const char *filename, unsigned int flags, unsigned int mask, struct statx *buffer); The dfd, filename and flags parameters indicate the file to query, in a similar way to fstatat(). There is no equivalent of lstat() as that can be emulated with statx() by passing AT_SYMLINK_NOFOLLOW in flags. There is also no equivalent of fstat() as that can be emulated by passing a NULL filename to statx() with the fd of interest in dfd. Whether or not statx() synchronises the attributes with the backing store can be controlled by OR'ing a value into the flags argument (this typically only affects network filesystems): (1) AT_STATX_SYNC_AS_STAT tells statx() to behave as stat() does in this respect. (2) AT_STATX_FORCE_SYNC will require a network filesystem to synchronise its attributes with the server - which might require data writeback to occur to get the timestamps correct. (3) AT_STATX_DONT_SYNC will suppress synchronisation with the server in a network filesystem. The resulting values should be considered approximate. mask is a bitmask indicating the fields in struct statx that are of interest to the caller. The user should set this to STATX_BASIC_STATS to get the basic set returned by stat(). It should be noted that asking for more information may entail extra I/O operations. buffer points to the destination for the data. This must be 256 bytes in size. ====================== MAIN ATTRIBUTES RECORD ====================== The following structures are defined in which to return the main attribute set: struct statx_timestamp { __s64 tv_sec; __s32 tv_nsec; __s32 __reserved; }; struct statx { __u32 stx_mask; __u32 stx_blksize; __u64 stx_attributes; __u32 stx_nlink; __u32 stx_uid; __u32 stx_gid; __u16 stx_mode; __u16 __spare0[1]; __u64 stx_ino; __u64 stx_size; __u64 stx_blocks; __u64 __spare1[1]; struct statx_timestamp stx_atime; struct statx_timestamp stx_btime; struct statx_timestamp stx_ctime; struct statx_timestamp stx_mtime; __u32 stx_rdev_major; __u32 stx_rdev_minor; __u32 stx_dev_major; __u32 stx_dev_minor; __u64 __spare2[14]; }; The defined bits in request_mask and stx_mask are: STATX_TYPE Want/got stx_mode & S_IFMT STATX_MODE Want/got stx_mode & ~S_IFMT STATX_NLINK Want/got stx_nlink STATX_UID Want/got stx_uid STATX_GID Want/got stx_gid STATX_ATIME Want/got stx_atime{,_ns} STATX_MTIME Want/got stx_mtime{,_ns} STATX_CTIME Want/got stx_ctime{,_ns} STATX_INO Want/got stx_ino STATX_SIZE Want/got stx_size STATX_BLOCKS Want/got stx_blocks STATX_BASIC_STATS [The stuff in the normal stat struct] STATX_BTIME Want/got stx_btime{,_ns} STATX_ALL [All currently available stuff] stx_btime is the file creation time, stx_mask is a bitmask indicating the data provided and __spares*[] are where as-yet undefined fields can be placed. Time fields are structures with separate seconds and nanoseconds fields plus a reserved field in case we want to add even finer resolution. Note that times will be negative if before 1970; in such a case, the nanosecond fields will also be negative if not zero. The bits defined in the stx_attributes field convey information about a file, how it is accessed, where it is and what it does. The following attributes map to FS_*_FL flags and are the same numerical value: STATX_ATTR_COMPRESSED File is compressed by the fs STATX_ATTR_IMMUTABLE File is marked immutable STATX_ATTR_APPEND File is append-only STATX_ATTR_NODUMP File is not to be dumped STATX_ATTR_ENCRYPTED File requires key to decrypt in fs Within the kernel, the supported flags are listed by: KSTAT_ATTR_FS_IOC_FLAGS [Are any other IOC flags of sufficient general interest to be exposed through this interface?] New flags include: STATX_ATTR_AUTOMOUNT Object is an automount trigger These are for the use of GUI tools that might want to mark files specially, depending on what they are. Fields in struct statx come in a number of classes: (0) stx_dev_*, stx_blksize. These are local system information and are always available. (1) stx_mode, stx_nlinks, stx_uid, stx_gid, stx_[amc]time, stx_ino, stx_size, stx_blocks. These will be returned whether the caller asks for them or not. The corresponding bits in stx_mask will be set to indicate whether they actually have valid values. If the caller didn't ask for them, then they may be approximated. For example, NFS won't waste any time updating them from the server, unless as a byproduct of updating something requested. If the values don't actually exist for the underlying object (such as UID or GID on a DOS file), then the bit won't be set in the stx_mask, even if the caller asked for the value. In such a case, the returned value will be a fabrication. Note that there are instances where the type might not be valid, for instance Windows reparse points. (2) stx_rdev_*. This will be set only if stx_mode indicates we're looking at a blockdev or a chardev, otherwise will be 0. (3) stx_btime. Similar to (1), except this will be set to 0 if it doesn't exist. ======= TESTING ======= The following test program can be used to test the statx system call: samples/statx/test-statx.c Just compile and run, passing it paths to the files you want to examine. The file is built automatically if CONFIG_SAMPLES is enabled. Here's some example output. Firstly, an NFS directory that crosses to another FSID. Note that the AUTOMOUNT attribute is set because transiting this directory will cause d_automount to be invoked by the VFS. [root@andromeda ~]# /tmp/test-statx -A /warthog/data statx(/warthog/data) = 0 results=7ff Size: 4096 Blocks: 8 IO Block: 1048576 directory Device: 00:26 Inode: 1703937 Links: 125 Access: (3777/drwxrwxrwx) Uid: 0 Gid: 4041 Access: 2016-11-24 09:02:12.219699527+0000 Modify: 2016-11-17 10:44:36.225653653+0000 Change: 2016-11-17 10:44:36.225653653+0000 Attributes: 0000000000001000 (-------- -------- -------- -------- -------- -------- ---m---- --------) Secondly, the result of automounting on that directory. [root@andromeda ~]# /tmp/test-statx /warthog/data statx(/warthog/data) = 0 results=7ff Size: 4096 Blocks: 8 IO Block: 1048576 directory Device: 00:27 Inode: 2 Links: 125 Access: (3777/drwxrwxrwx) Uid: 0 Gid: 4041 Access: 2016-11-24 09:02:12.219699527+0000 Modify: 2016-11-17 10:44:36.225653653+0000 Change: 2016-11-17 10:44:36.225653653+0000 Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2017-02-24mm, fs: reduce fault, page_mkwrite, and pfn_mkwrite to take only vmfDave Jiang
->fault(), ->page_mkwrite(), and ->pfn_mkwrite() calls do not need to take a vma and vmf parameter when the vma already resides in vmf. Remove the vma parameter to simplify things. [arnd@arndb.de: fix ARM build] Link: http://lkml.kernel.org/r/20170125223558.1451224-1-arnd@arndb.de Link: http://lkml.kernel.org/r/148521301778.19116.10840599906674778980.stgit@djiang5-desk3.ch.intel.com Signed-off-by: Dave Jiang <dave.jiang@intel.com> Signed-off-by: Arnd Bergmann <arnd@arndb.de> Reviewed-by: Ross Zwisler <ross.zwisler@linux.intel.com> Cc: Theodore Ts'o <tytso@mit.edu> Cc: Darrick J. Wong <darrick.wong@oracle.com> Cc: Matthew Wilcox <mawilcox@microsoft.com> Cc: Dave Hansen <dave.hansen@intel.com> Cc: Christoph Hellwig <hch@lst.de> Cc: Jan Kara <jack@suse.com> Cc: Dan Williams <dan.j.williams@intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2017-02-20Merge tag 'fscrypt-for-linus' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/tytso/fscrypt Pull fscrypt updates from Ted Ts'o: "Various cleanups for the file system encryption feature" * tag 'fscrypt-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/fscrypt: fscrypt: constify struct fscrypt_operations fscrypt: properly declare on-stack completion fscrypt: split supp and notsupp declarations into their own headers fscrypt: remove redundant assignment of res fscrypt: make fscrypt_operations.key_prefix a string fscrypt: remove unused 'mode' member of fscrypt_ctx ext4: don't allow encrypted operations without keys fscrypt: make test_dummy_encryption require a keyring key fscrypt: factor out bio specific functions fscrypt: pass up error codes from ->get_context() fscrypt: remove user-triggerable warning messages fscrypt: use EEXIST when file already uses different policy fscrypt: use ENOTDIR when setting encryption policy on nondirectory fscrypt: use ENOKEY when file cannot be created w/o key
2017-02-08fscrypt: constify struct fscrypt_operationsEric Biggers
Signed-off-by: Eric Biggers <ebiggers@google.com> Signed-off-by: Theodore Ts'o <tytso@mit.edu> Reviewed-by: Richard Weinberger <richard@nod.at>
2017-02-06fscrypt: split supp and notsupp declarations into their own headersEric Biggers
Previously, each filesystem configured without encryption support would define all the public fscrypt functions to their notsupp_* stubs. This list of #defines had to be updated in every filesystem whenever a change was made to the public fscrypt functions. To make things more maintainable now that we have three filesystems using fscrypt, split the old header fscrypto.h into several new headers. fscrypt_supp.h contains the real declarations and is included by filesystems when configured with encryption support, whereas fscrypt_notsupp.h contains the inline stubs and is included by filesystems when configured without encryption support. fscrypt_common.h contains common declarations needed by both. Signed-off-by: Eric Biggers <ebiggers@google.com> Signed-off-by: Theodore Ts'o <tytso@mit.edu>
2017-01-17ubifs: Fix journal replay wrt. xattr nodesRichard Weinberger
When replaying the journal it can happen that a journal entry points to a garbage collected node. This is the case when a power-cut occurred between a garbage collect run and a commit. In such a case nodes have to be read using the failable read functions to detect whether the found node matches what we expect. One corner case was forgotten, when the journal contains an entry to remove an inode all xattrs have to be removed too. UBIFS models xattr like directory entries, so the TNC code iterates over all xattrs of the inode and removes them too. This code re-uses the functions for walking directories and calls ubifs_tnc_next_ent(). ubifs_tnc_next_ent() expects to be used only after the journal and aborts when a node does not match the expected result. This behavior can render an UBIFS volume unmountable after a power-cut when xattrs are used. Fix this issue by using failable read functions in ubifs_tnc_next_ent() too when replaying the journal. Cc: stable@vger.kernel.org Fixes: 1e51764a3c2ac05a ("UBIFS: add new flash file system") Reported-by: Rock Lee <rockdotlee@gmail.com> Reviewed-by: David Gstir <david@sigma-star.at> Signed-off-by: Richard Weinberger <richard@nod.at>
2017-01-17ubifs: remove redundant checks for encryption keyEric Biggers
In several places, ubifs checked for an encryption key before creating a file in an encrypted directory. This was redundant with fscrypt_setup_filename() or ubifs_new_inode(), and in the case of ubifs_link() it broke linking to special files. So remove the extra checks. Signed-off-by: Eric Biggers <ebiggers@google.com> Signed-off-by: Richard Weinberger <richard@nod.at>
2017-01-17ubifs: allow encryption ioctls in compat modeEric Biggers
The ubifs encryption ioctls did not work when called by a 32-bit program on a 64-bit kernel. Since 'struct fscrypt_policy' is not affected by the word size, ubifs just needs to allow these ioctls through, like what ext4 and f2fs do. Signed-off-by: Eric Biggers <ebiggers@google.com> Signed-off-by: Richard Weinberger <richard@nod.at>
2017-01-17ubifs: add CONFIG_BLOCK dependency for encryptionArnd Bergmann
This came up during the v4.10 merge window: warning: (UBIFS_FS_ENCRYPTION) selects FS_ENCRYPTION which has unmet direct dependencies (BLOCK) fs/crypto/crypto.c: In function 'fscrypt_zeroout_range': fs/crypto/crypto.c:355:9: error: implicit declaration of function 'bio_alloc';did you mean 'd_alloc'? [-Werror=implicit-function-declaration] bio = bio_alloc(GFP_NOWAIT, 1); The easiest way out is to limit UBIFS_FS_ENCRYPTION to configurations that also enable BLOCK. Fixes: d475a507457b ("ubifs: Add skeleton for fscrypto") Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Richard Weinberger <richard@nod.at>
2017-01-17ubifs: fix unencrypted journal writePeter Rosin
Without this, I get the following on reboot: UBIFS error (ubi1:0 pid 703): ubifs_load_znode: bad target node (type 1) length (8240) UBIFS error (ubi1:0 pid 703): ubifs_load_znode: have to be in range of 48-4144 UBIFS error (ubi1:0 pid 703): ubifs_load_znode: bad indexing node at LEB 13:11080, error 5 magic 0x6101831 crc 0xb1cb246f node_type 9 (indexing node) group_type 0 (no node group) sqnum 546 len 128 child_cnt 5 level 0 Branches: 0: LEB 14:72088 len 161 key (133, inode) 1: LEB 14:81120 len 160 key (134, inode) 2: LEB 20:26624 len 8240 key (134, data, 0) 3: LEB 14:81280 len 160 key (135, inode) 4: LEB 20:34864 len 8240 key (135, data, 0) UBIFS warning (ubi1:0 pid 703): ubifs_ro_mode.part.0: switched to read-only mode, error -22 CPU: 0 PID: 703 Comm: mount Not tainted 4.9.0-next-20161213+ #1197 Hardware name: Atmel SAMA5 [<c010d2ac>] (unwind_backtrace) from [<c010b250>] (show_stack+0x10/0x14) [<c010b250>] (show_stack) from [<c024df94>] (ubifs_jnl_update+0x2e8/0x614) [<c024df94>] (ubifs_jnl_update) from [<c0254bf8>] (ubifs_mkdir+0x160/0x204) [<c0254bf8>] (ubifs_mkdir) from [<c01a6030>] (vfs_mkdir+0xb0/0x104) [<c01a6030>] (vfs_mkdir) from [<c0286070>] (ovl_create_real+0x118/0x248) [<c0286070>] (ovl_create_real) from [<c0283ed4>] (ovl_fill_super+0x994/0xaf4) [<c0283ed4>] (ovl_fill_super) from [<c019c394>] (mount_nodev+0x44/0x9c) [<c019c394>] (mount_nodev) from [<c019c4ac>] (mount_fs+0x14/0xa4) [<c019c4ac>] (mount_fs) from [<c01b5338>] (vfs_kern_mount+0x4c/0xd4) [<c01b5338>] (vfs_kern_mount) from [<c01b6b80>] (do_mount+0x154/0xac8) [<c01b6b80>] (do_mount) from [<c01b782c>] (SyS_mount+0x74/0x9c) [<c01b782c>] (SyS_mount) from [<c0107f80>] (ret_fast_syscall+0x0/0x3c) UBIFS error (ubi1:0 pid 703): ubifs_mkdir: cannot create directory, error -22 overlayfs: failed to create directory /mnt/ovl/work/work (errno: 22); mounting read-only Fixes: 7799953b34d1 ("ubifs: Implement encrypt/decrypt for all IO") Signed-off-by: Peter Rosin <peda@axentia.se> Tested-by: Kevin Hilman <khilman@baylibre.com> Signed-off-by: Richard Weinberger <richard@nod.at>
2017-01-17ubifs: ensure zero err is returned on successful returnColin Ian King
err is no longer being set on a successful return path, causing a garbage value being returned. Fix this by setting err to zero for the successful return path. Found with static analysis by CoverityScan, CID 1389473 Fixes: 7799953b34d18 ("ubifs: Implement encrypt/decrypt for all IO") Signed-off-by: Colin Ian King <colin.king@canonical.com> Signed-off-by: Richard Weinberger <richard@nod.at>
2017-01-08fscrypt: make fscrypt_operations.key_prefix a stringEric Biggers
There was an unnecessary amount of complexity around requesting the filesystem-specific key prefix. It was unclear why; perhaps it was envisioned that different instances of the same filesystem type could use different key prefixes, or that key prefixes could be binary. However, neither of those things were implemented or really make sense at all. So simplify the code by making key_prefix a const char *. Signed-off-by: Eric Biggers <ebiggers@google.com> Reviewed-by: Richard Weinberger <richard@nod.at> Signed-off-by: Theodore Ts'o <tytso@mit.edu>
2016-12-17Merge uncontroversial parts of branch 'readlink' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/vfs Pull partial readlink cleanups from Miklos Szeredi. This is the uncontroversial part of the readlink cleanup patch-set that simplifies the default readlink handling. Miklos and Al are still discussing the rest of the series. * git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/vfs: vfs: make generic_readlink() static vfs: remove ".readlink = generic_readlink" assignments vfs: default to generic_readlink() vfs: replace calling i_op->readlink with vfs_readlink() proc/self: use generic_readlink ecryptfs: use vfs_get_link() bad_inode: add missing i_op initializers
2016-12-14ubifs: Initialize fstr_real_lenRichard Weinberger
While fstr_real_len is only being used under if (encrypted), gcc-6 still warns. Fixes this false positive: fs/ubifs/dir.c: In function 'ubifs_readdir': fs/ubifs/dir.c:629:13: warning: 'fstr_real_len' may be used uninitialized in this function [-Wmaybe-uninitialized] fstr.len = fstr_real_len Initialize fstr_real_len to make gcc happy. Reported-by: Stephen Rothwell <sfr@canb.auug.org.au> Signed-off-by: Richard Weinberger <richard@nod.at>
2016-12-13ubifs: Use fscrypt ioctl() helpersRichard Weinberger
Commit db717d8e26c2 ("fscrypto: move ioctl processing more fully into common code") moved ioctl() related functions into fscrypt and offers us now a set of helper functions. Signed-off-by: Richard Weinberger <richard@nod.at> Reviewed-by: David Gstir <david@sigma-star.at>
2016-12-13ubifs: Use FS_CFLG_OWN_PAGESRichard Weinberger
Commit bd7b8290388d ("fscrypt: Cleanup page locking requirements for fscrypt_{decrypt,encrypt}_page()") renamed the flag. Signed-off-by: Richard Weinberger <richard@nod.at>
2016-12-12ubifs: Raise write version to 5Richard Weinberger
Starting with version 5 the following properties change: - UBIFS_FLG_DOUBLE_HASH is mandatory - UBIFS_FLG_ENCRYPTION is optional but depdens on UBIFS_FLG_DOUBLE_HASH - Filesystems with unknown super block flags will be rejected, this allows us in future to add new features without raising the UBIFS write version. Signed-off-by: Richard Weinberger <richard@nod.at>
2016-12-12ubifs: Implement UBIFS_FLG_ENCRYPTIONRichard Weinberger
This feature flag indicates that the filesystem contains encrypted files. Signed-off-by: Richard Weinberger <richard@nod.at>
2016-12-12ubifs: Implement UBIFS_FLG_DOUBLE_HASHRichard Weinberger
This feature flag indicates that all directory entry nodes have a 32bit cookie set and therefore UBIFS is allowed to perform lookups by hash. Signed-off-by: Richard Weinberger <richard@nod.at>
2016-12-12ubifs: Use a random number for cookiesRichard Weinberger
Signed-off-by: Richard Weinberger <richard@nod.at>
2016-12-12ubifs: Add full hash lookup supportRichard Weinberger
UBIFS stores a 32bit hash of every file, for traditional lookups by name this scheme is fine since UBIFS can first try to find the file by the hash of the filename and upon collisions it can walk through all entries with the same hash and do a string compare. When filesnames are encrypted fscrypto will ask the filesystem for a unique cookie, based on this cookie the filesystem has to be able to locate the target file again. With 32bit hashes this is impossible because the chance for collisions is very high. Do deal with that we store a 32bit cookie directly in the UBIFS directory entry node such that we get a 64bit cookie (32bit from filename hash and the dent cookie). For a lookup by hash UBIFS finds the entry by the first 32bit and then compares the dent cookie. If it does not match, it has to do a linear search of the whole directory and compares all dent cookies until the correct entry is found. Signed-off-by: Richard Weinberger <richard@nod.at>
2016-12-12ubifs: Rename tnc_read_node_nmRichard Weinberger
tnc_read_hashed_node() is a better name since we read a node by a given hash, not a name. Signed-off-by: Richard Weinberger <richard@nod.at>
2016-12-12ubifs: Add support for encrypted symlinksRichard Weinberger
Signed-off-by: Richard Weinberger <richard@nod.at>
2016-12-12ubifs: Implement encrypted filenamesRichard Weinberger
Signed-off-by: Richard Weinberger <richard@nod.at> Signed-off-by: David Gstir <david@sigma-star.at> Signed-off-by: Richard Weinberger <richard@nod.at>
2016-12-12ubifs: Make r5 hash binary string awareRichard Weinberger
As of now all filenames known by UBIFS are strings with a NUL terminator. With encrypted filenames a filename can be any binary string and the r5 function cannot search for the NUL terminator. UBIFS always knows how long a filename is, therefore we can change the hash function to iterate over the filename length to work correctly with binary strings. Signed-off-by: Richard Weinberger <richard@nod.at>
2016-12-12ubifs: Relax checks in ubifs_validate_entry()Richard Weinberger
With encrypted filenames we store raw binary data, doing string tests is no longer possible. Signed-off-by: Richard Weinberger <richard@nod.at>
2016-12-12ubifs: Implement encrypt/decrypt for all IORichard Weinberger
Signed-off-by: Richard Weinberger <richard@nod.at> Signed-off-by: David Gstir <david@sigma-star.at> Signed-off-by: Richard Weinberger <richard@nod.at>
2016-12-12ubifs: Constify struct inode pointer in ubifs_crypt_is_encrypted()Richard Weinberger
...and provide a non const variant for fscrypto Signed-off-by: Richard Weinberger <richard@nod.at>
2016-12-12ubifs: Introduce new data node field, compr_sizeRichard Weinberger
When data of a data node is compressed and encrypted we need to store the size of the compressed data because before encryption we may have to add padding bytes. For the new field we consume the last two padding bytes in struct ubifs_data_node. Two bytes are fine because the data length is at most 4096. Signed-off-by: Richard Weinberger <richard@nod.at>
2016-12-12ubifs: Enforce crypto policy in mmapRichard Weinberger
We need this extra check in mmap because a process could gain an already opened fd. Signed-off-by: Richard Weinberger <richard@nod.at>
2016-12-12ubifs: Massage assert in ubifs_xattr_set() wrt. fscryptoRichard Weinberger
When we're creating a new inode in UBIFS the inode is not yet exposed and fscrypto calls ubifs_xattr_set() without holding the inode mutex. This is okay but ubifs_xattr_set() has to know about this. Signed-off-by: Richard Weinberger <richard@nod.at>
2016-12-12ubifs: Preload crypto context in ->lookup()Richard Weinberger
...and mark the dentry as encrypted. Signed-off-by: Richard Weinberger <richard@nod.at>
2016-12-12ubifs: Enforce crypto policy in ->link and ->renameRichard Weinberger
When a file is moved or linked into another directory its current crypto policy has to be compatible with the target policy. Signed-off-by: Richard Weinberger <richard@nod.at>
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