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path: root/fs/ecryptfs/crypto.c (follow)
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* eCryptfs: Propagate vfs_read and vfs_write return codesTyler Hicks2009-09-231-8/+11
| | | | | | | | | | | | | | | | | | Errors returned from vfs_read() and vfs_write() calls to the lower filesystem were being masked as -EINVAL. This caused some confusion to users who saw EINVAL instead of ENOSPC when the disk was full, for instance. Also, the actual bytes read or written were not accessible by callers to ecryptfs_read_lower() and ecryptfs_write_lower(), which may be useful in some cases. This patch updates the error handling logic where those functions are called in order to accept positive return codes indicating success. Cc: Eric Sandeen <esandeen@redhat.com> Acked-by: Serge Hallyn <serue@us.ibm.com> Cc: ecryptfs-devel@lists.launchpad.net Signed-off-by: Tyler Hicks <tyhicks@linux.vnet.ibm.com>
* eCryptfs: Filename encryption only supports password auth tokensTyler Hicks2009-09-231-2/+2
| | | | | | | | | | | | | Returns -ENOTSUPP when attempting to use filename encryption with something other than a password authentication token, such as a private token from openssl. Using filename encryption with a userspace eCryptfs key module is a future goal. Until then, this patch handles the situation a little better than simply using a BUG_ON(). Acked-by: Serge Hallyn <serue@us.ibm.com> Cc: ecryptfs-devel@lists.launchpad.net Cc: stable <stable@kernel.org> Signed-off-by: Tyler Hicks <tyhicks@linux.vnet.ibm.com>
* eCryptfs: Handle unrecognized tag 3 cipher codesTyler Hicks2009-09-231-0/+1
| | | | | | | | | | | | Returns an error when an unrecognized cipher code is present in a tag 3 packet or an ecryptfs_crypt_stat cannot be initialized. Also sets an crypt_stat->tfm error pointer to NULL to ensure that it will not be incorrectly freed in ecryptfs_destroy_crypt_stat(). Acked-by: Serge Hallyn <serue@us.ibm.com> Cc: ecryptfs-devel@lists.launchpad.net Cc: stable <stable@kernel.org> Signed-off-by: Tyler Hicks <tyhicks@linux.vnet.ibm.com>
* ecryptfs: improved dependency checking and reportingDave Hansen2009-09-231-2/+3
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | So, I compiled a 2.6.31-rc5 kernel with ecryptfs and loaded its module. When it came time to mount my filesystem, I got this in dmesg, and it refused to mount: [93577.776637] Unable to allocate crypto cipher with name [aes]; rc = [-2] [93577.783280] Error attempting to initialize key TFM cipher with name = [aes]; rc = [-2] [93577.791183] Error attempting to initialize cipher with name = [aes] and key size = [32]; rc = [-2] [93577.800113] Error parsing options; rc = [-22] I figured from the error message that I'd either forgotten to load "aes" or that my key size was bogus. Neither one of those was the case. In fact, I was missing the CRYPTO_ECB config option and the 'ecb' module. Unfortunately, there's no trace of 'ecb' in that error message. I've done two things to fix this. First, I've modified ecryptfs's Kconfig entry to select CRYPTO_ECB and CRYPTO_CBC. I also took CRYPTO out of the dependencies since the 'select' will take care of it for us. I've also modified the error messages to print a string that should contain both 'ecb' and 'aes' in my error case. That will give any future users a chance of finding the right modules and Kconfig options. I also wonder if we should: select CRYPTO_AES if !EMBEDDED since I think most ecryptfs users are using AES like me. Cc: ecryptfs-devel@lists.launchpad.net Cc: linux-fsdevel@vger.kernel.org Cc: linux-kernel@vger.kernel.org Cc: Dustin Kirkland <kirkland@canonical.com> Signed-off-by: Dave Hansen <dave@linux.vnet.ibm.com> [tyhicks@linux.vnet.ibm.com: Removed extra newline, 80-char violation] Signed-off-by: Tyler Hicks <tyhicks@linux.vnet.ibm.com>
* eCryptfs: Fix lockdep-reported AB-BA mutex issueRoland Dreier2009-09-231-3/+5
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Lockdep reports the following valid-looking possible AB-BA deadlock with global_auth_tok_list_mutex and keysig_list_mutex: ecryptfs_new_file_context() -> ecryptfs_copy_mount_wide_sigs_to_inode_sigs() -> mutex_lock(&mount_crypt_stat->global_auth_tok_list_mutex); -> ecryptfs_add_keysig() -> mutex_lock(&crypt_stat->keysig_list_mutex); vs ecryptfs_generate_key_packet_set() -> mutex_lock(&crypt_stat->keysig_list_mutex); -> ecryptfs_find_global_auth_tok_for_sig() -> mutex_lock(&mount_crypt_stat->global_auth_tok_list_mutex); ie the two mutexes are taken in opposite orders in the two different code paths. I'm not sure if this is a real bug where two threads could actually hit the two paths in parallel and deadlock, but it at least makes lockdep impossible to use with ecryptfs since this report triggers every time and disables future lockdep reporting. Since ecryptfs_add_keysig() is called only from the single callsite in ecryptfs_copy_mount_wide_sigs_to_inode_sigs(), the simplest fix seems to be to move the lock of keysig_list_mutex back up outside of the where global_auth_tok_list_mutex is taken. This patch does that, and fixes the lockdep report on my system (and ecryptfs still works OK). The full output of lockdep fixed by this patch is: ======================================================= [ INFO: possible circular locking dependency detected ] 2.6.31-2-generic #14~rbd2 ------------------------------------------------------- gdm/2640 is trying to acquire lock: (&mount_crypt_stat->global_auth_tok_list_mutex){+.+.+.}, at: [<ffffffff8121591e>] ecryptfs_find_global_auth_tok_for_sig+0x2e/0x90 but task is already holding lock: (&crypt_stat->keysig_list_mutex){+.+.+.}, at: [<ffffffff81217728>] ecryptfs_generate_key_packet_set+0x58/0x2b0 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (&crypt_stat->keysig_list_mutex){+.+.+.}: [<ffffffff8108c897>] check_prev_add+0x2a7/0x370 [<ffffffff8108cfc1>] validate_chain+0x661/0x750 [<ffffffff8108d2e7>] __lock_acquire+0x237/0x430 [<ffffffff8108d585>] lock_acquire+0xa5/0x150 [<ffffffff815526cd>] __mutex_lock_common+0x4d/0x3d0 [<ffffffff81552b56>] mutex_lock_nested+0x46/0x60 [<ffffffff8121526a>] ecryptfs_add_keysig+0x5a/0xb0 [<ffffffff81213299>] ecryptfs_copy_mount_wide_sigs_to_inode_sigs+0x59/0xb0 [<ffffffff81214b06>] ecryptfs_new_file_context+0xa6/0x1a0 [<ffffffff8120e42a>] ecryptfs_initialize_file+0x4a/0x140 [<ffffffff8120e54d>] ecryptfs_create+0x2d/0x60 [<ffffffff8113a7d4>] vfs_create+0xb4/0xe0 [<ffffffff8113a8c4>] __open_namei_create+0xc4/0x110 [<ffffffff8113d1c1>] do_filp_open+0xa01/0xae0 [<ffffffff8112d8d9>] do_sys_open+0x69/0x140 [<ffffffff8112d9f0>] sys_open+0x20/0x30 [<ffffffff81013132>] system_call_fastpath+0x16/0x1b [<ffffffffffffffff>] 0xffffffffffffffff -> #0 (&mount_crypt_stat->global_auth_tok_list_mutex){+.+.+.}: [<ffffffff8108c675>] check_prev_add+0x85/0x370 [<ffffffff8108cfc1>] validate_chain+0x661/0x750 [<ffffffff8108d2e7>] __lock_acquire+0x237/0x430 [<ffffffff8108d585>] lock_acquire+0xa5/0x150 [<ffffffff815526cd>] __mutex_lock_common+0x4d/0x3d0 [<ffffffff81552b56>] mutex_lock_nested+0x46/0x60 [<ffffffff8121591e>] ecryptfs_find_global_auth_tok_for_sig+0x2e/0x90 [<ffffffff812177d5>] ecryptfs_generate_key_packet_set+0x105/0x2b0 [<ffffffff81212f49>] ecryptfs_write_headers_virt+0xc9/0x120 [<ffffffff8121306d>] ecryptfs_write_metadata+0xcd/0x200 [<ffffffff8120e44b>] ecryptfs_initialize_file+0x6b/0x140 [<ffffffff8120e54d>] ecryptfs_create+0x2d/0x60 [<ffffffff8113a7d4>] vfs_create+0xb4/0xe0 [<ffffffff8113a8c4>] __open_namei_create+0xc4/0x110 [<ffffffff8113d1c1>] do_filp_open+0xa01/0xae0 [<ffffffff8112d8d9>] do_sys_open+0x69/0x140 [<ffffffff8112d9f0>] sys_open+0x20/0x30 [<ffffffff81013132>] system_call_fastpath+0x16/0x1b [<ffffffffffffffff>] 0xffffffffffffffff other info that might help us debug this: 2 locks held by gdm/2640: #0: (&sb->s_type->i_mutex_key#11){+.+.+.}, at: [<ffffffff8113cb8b>] do_filp_open+0x3cb/0xae0 #1: (&crypt_stat->keysig_list_mutex){+.+.+.}, at: [<ffffffff81217728>] ecryptfs_generate_key_packet_set+0x58/0x2b0 stack backtrace: Pid: 2640, comm: gdm Tainted: G C 2.6.31-2-generic #14~rbd2 Call Trace: [<ffffffff8108b988>] print_circular_bug_tail+0xa8/0xf0 [<ffffffff8108c675>] check_prev_add+0x85/0x370 [<ffffffff81094912>] ? __module_text_address+0x12/0x60 [<ffffffff8108cfc1>] validate_chain+0x661/0x750 [<ffffffff81017275>] ? print_context_stack+0x85/0x140 [<ffffffff81089c68>] ? find_usage_backwards+0x38/0x160 [<ffffffff8108d2e7>] __lock_acquire+0x237/0x430 [<ffffffff8108d585>] lock_acquire+0xa5/0x150 [<ffffffff8121591e>] ? ecryptfs_find_global_auth_tok_for_sig+0x2e/0x90 [<ffffffff8108b0b0>] ? check_usage_backwards+0x0/0xb0 [<ffffffff815526cd>] __mutex_lock_common+0x4d/0x3d0 [<ffffffff8121591e>] ? ecryptfs_find_global_auth_tok_for_sig+0x2e/0x90 [<ffffffff8121591e>] ? ecryptfs_find_global_auth_tok_for_sig+0x2e/0x90 [<ffffffff8108c02c>] ? mark_held_locks+0x6c/0xa0 [<ffffffff81125b0d>] ? kmem_cache_alloc+0xfd/0x1a0 [<ffffffff8108c34d>] ? trace_hardirqs_on_caller+0x14d/0x190 [<ffffffff81552b56>] mutex_lock_nested+0x46/0x60 [<ffffffff8121591e>] ecryptfs_find_global_auth_tok_for_sig+0x2e/0x90 [<ffffffff812177d5>] ecryptfs_generate_key_packet_set+0x105/0x2b0 [<ffffffff81212f49>] ecryptfs_write_headers_virt+0xc9/0x120 [<ffffffff8121306d>] ecryptfs_write_metadata+0xcd/0x200 [<ffffffff81210240>] ? ecryptfs_init_persistent_file+0x60/0xe0 [<ffffffff8120e44b>] ecryptfs_initialize_file+0x6b/0x140 [<ffffffff8120e54d>] ecryptfs_create+0x2d/0x60 [<ffffffff8113a7d4>] vfs_create+0xb4/0xe0 [<ffffffff8113a8c4>] __open_namei_create+0xc4/0x110 [<ffffffff8113d1c1>] do_filp_open+0xa01/0xae0 [<ffffffff8129a93e>] ? _raw_spin_unlock+0x5e/0xb0 [<ffffffff8155410b>] ? _spin_unlock+0x2b/0x40 [<ffffffff81139e9b>] ? getname+0x3b/0x240 [<ffffffff81148a5a>] ? alloc_fd+0xfa/0x140 [<ffffffff8112d8d9>] do_sys_open+0x69/0x140 [<ffffffff81553b8f>] ? trace_hardirqs_on_thunk+0x3a/0x3f [<ffffffff8112d9f0>] sys_open+0x20/0x30 [<ffffffff81013132>] system_call_fastpath+0x16/0x1b Signed-off-by: Roland Dreier <rolandd@cisco.com> Signed-off-by: Tyler Hicks <tyhicks@linux.vnet.ibm.com>
* ecryptfs: Remove unneeded locking that triggers lockdep false positivesRoland Dreier2009-09-231-2/+0
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | In ecryptfs_destroy_inode(), inode_info->lower_file_mutex is locked, and just after the mutex is unlocked, the code does: kmem_cache_free(ecryptfs_inode_info_cache, inode_info); This means that if another context could possibly try to take the same mutex as ecryptfs_destroy_inode(), then it could end up getting the mutex just before the data structure containing the mutex is freed. So any such use would be an obvious use-after-free bug (catchable with slab poisoning or mutex debugging), and therefore the locking in ecryptfs_destroy_inode() is not needed and can be dropped. Similarly, in ecryptfs_destroy_crypt_stat(), crypt_stat->keysig_list_mutex is locked, and then the mutex is unlocked just before the code does: memset(crypt_stat, 0, sizeof(struct ecryptfs_crypt_stat)); Therefore taking this mutex is similarly not necessary. Removing this locking fixes false-positive lockdep reports such as the following (and they are false-positives for exactly the same reason that the locking is not needed): ================================= [ INFO: inconsistent lock state ] 2.6.31-2-generic #14~rbd3 --------------------------------- inconsistent {RECLAIM_FS-ON-W} -> {IN-RECLAIM_FS-W} usage. kswapd0/323 [HC0[0]:SC0[0]:HE1:SE1] takes: (&inode_info->lower_file_mutex){+.+.?.}, at: [<ffffffff81210d34>] ecryptfs_destroy_inode+0x34/0x100 {RECLAIM_FS-ON-W} state was registered at: [<ffffffff8108c02c>] mark_held_locks+0x6c/0xa0 [<ffffffff8108c10f>] lockdep_trace_alloc+0xaf/0xe0 [<ffffffff81125a51>] kmem_cache_alloc+0x41/0x1a0 [<ffffffff8113117a>] get_empty_filp+0x7a/0x1a0 [<ffffffff8112dd46>] dentry_open+0x36/0xc0 [<ffffffff8121a36c>] ecryptfs_privileged_open+0x5c/0x2e0 [<ffffffff81210283>] ecryptfs_init_persistent_file+0xa3/0xe0 [<ffffffff8120e838>] ecryptfs_lookup_and_interpose_lower+0x278/0x380 [<ffffffff8120f97a>] ecryptfs_lookup+0x12a/0x250 [<ffffffff8113930a>] real_lookup+0xea/0x160 [<ffffffff8113afc8>] do_lookup+0xb8/0xf0 [<ffffffff8113b518>] __link_path_walk+0x518/0x870 [<ffffffff8113bd9c>] path_walk+0x5c/0xc0 [<ffffffff8113be5b>] do_path_lookup+0x5b/0xa0 [<ffffffff8113bfe7>] user_path_at+0x57/0xa0 [<ffffffff811340dc>] vfs_fstatat+0x3c/0x80 [<ffffffff8113424b>] vfs_stat+0x1b/0x20 [<ffffffff81134274>] sys_newstat+0x24/0x50 [<ffffffff81013132>] system_call_fastpath+0x16/0x1b [<ffffffffffffffff>] 0xffffffffffffffff irq event stamp: 7811 hardirqs last enabled at (7811): [<ffffffff810c037f>] call_rcu+0x5f/0x90 hardirqs last disabled at (7810): [<ffffffff810c0353>] call_rcu+0x33/0x90 softirqs last enabled at (3764): [<ffffffff810631da>] __do_softirq+0x14a/0x220 softirqs last disabled at (3751): [<ffffffff8101440c>] call_softirq+0x1c/0x30 other info that might help us debug this: 2 locks held by kswapd0/323: #0: (shrinker_rwsem){++++..}, at: [<ffffffff810f67ed>] shrink_slab+0x3d/0x190 #1: (&type->s_umount_key#35){.+.+..}, at: [<ffffffff811429a1>] prune_dcache+0xd1/0x1b0 stack backtrace: Pid: 323, comm: kswapd0 Tainted: G C 2.6.31-2-generic #14~rbd3 Call Trace: [<ffffffff8108ad6c>] print_usage_bug+0x18c/0x1a0 [<ffffffff8108aff0>] ? check_usage_forwards+0x0/0xc0 [<ffffffff8108bac2>] mark_lock_irq+0xf2/0x280 [<ffffffff8108bd87>] mark_lock+0x137/0x1d0 [<ffffffff81164710>] ? fsnotify_clear_marks_by_inode+0x30/0xf0 [<ffffffff8108bee6>] mark_irqflags+0xc6/0x1a0 [<ffffffff8108d337>] __lock_acquire+0x287/0x430 [<ffffffff8108d585>] lock_acquire+0xa5/0x150 [<ffffffff81210d34>] ? ecryptfs_destroy_inode+0x34/0x100 [<ffffffff8108d2e7>] ? __lock_acquire+0x237/0x430 [<ffffffff815526ad>] __mutex_lock_common+0x4d/0x3d0 [<ffffffff81210d34>] ? ecryptfs_destroy_inode+0x34/0x100 [<ffffffff81164710>] ? fsnotify_clear_marks_by_inode+0x30/0xf0 [<ffffffff81210d34>] ? ecryptfs_destroy_inode+0x34/0x100 [<ffffffff8129a91e>] ? _raw_spin_unlock+0x5e/0xb0 [<ffffffff81552b36>] mutex_lock_nested+0x46/0x60 [<ffffffff81210d34>] ecryptfs_destroy_inode+0x34/0x100 [<ffffffff81145d27>] destroy_inode+0x87/0xd0 [<ffffffff81146b4c>] generic_delete_inode+0x12c/0x1a0 [<ffffffff81145832>] iput+0x62/0x70 [<ffffffff811423c8>] dentry_iput+0x98/0x110 [<ffffffff81142550>] d_kill+0x50/0x80 [<ffffffff81142623>] prune_one_dentry+0xa3/0xc0 [<ffffffff811428b1>] __shrink_dcache_sb+0x271/0x290 [<ffffffff811429d9>] prune_dcache+0x109/0x1b0 [<ffffffff81142abf>] shrink_dcache_memory+0x3f/0x50 [<ffffffff810f68dd>] shrink_slab+0x12d/0x190 [<ffffffff810f9377>] balance_pgdat+0x4d7/0x640 [<ffffffff8104c4c0>] ? finish_task_switch+0x40/0x150 [<ffffffff810f63c0>] ? isolate_pages_global+0x0/0x60 [<ffffffff810f95f7>] kswapd+0x117/0x170 [<ffffffff810777a0>] ? autoremove_wake_function+0x0/0x40 [<ffffffff810f94e0>] ? kswapd+0x0/0x170 [<ffffffff810773be>] kthread+0x9e/0xb0 [<ffffffff8101430a>] child_rip+0xa/0x20 [<ffffffff81013c90>] ? restore_args+0x0/0x30 [<ffffffff81077320>] ? kthread+0x0/0xb0 [<ffffffff81014300>] ? child_rip+0x0/0x20 Signed-off-by: Roland Dreier <roland@digitalvampire.org> Signed-off-by: Tyler Hicks <tyhicks@linux.vnet.ibm.com>
* eCryptfs: Fix data corruption when using ecryptfs_passthroughTyler Hicks2009-04-221-19/+2
| | | | | | | | | | | | | | ecryptfs_passthrough is a mount option that allows eCryptfs to allow data to be written to non-eCryptfs files in the lower filesystem. The passthrough option was causing data corruption due to it not always being treated as a non-eCryptfs file. The first 8 bytes of an eCryptfs file contains the decrypted file size. This value was being written to the non-eCryptfs files, too. Also, extra 0x00 characters were being written to make the file size a multiple of PAGE_CACHE_SIZE. Signed-off-by: Tyler Hicks <tyhicks@linux.vnet.ibm.com>
* eCryptfs: NULL crypt_stat dereference during lookupTyler Hicks2009-03-221-4/+6
| | | | | | | | | | | | | | | | | | | If ecryptfs_encrypted_view or ecryptfs_xattr_metadata were being specified as mount options, a NULL pointer dereference of crypt_stat was possible during lookup. This patch moves the crypt_stat assignment into ecryptfs_lookup_and_interpose_lower(), ensuring that crypt_stat will not be NULL before we attempt to dereference it. Thanks to Dan Carpenter and his static analysis tool, smatch, for finding this bug. Signed-off-by: Tyler Hicks <tyhicks@linux.vnet.ibm.com> Acked-by: Dustin Kirkland <kirkland@canonical.com> Cc: Dan Carpenter <error27@gmail.com> Cc: Serge Hallyn <serue@us.ibm.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* eCryptfs: Allocate a variable number of pages for file headersTyler Hicks2009-03-221-13/+26
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | When allocating the memory used to store the eCryptfs header contents, a single, zeroed page was being allocated with get_zeroed_page(). However, the size of an eCryptfs header is either PAGE_CACHE_SIZE or ECRYPTFS_MINIMUM_HEADER_EXTENT_SIZE (8192), whichever is larger, and is stored in the file's private_data->crypt_stat->num_header_bytes_at_front field. ecryptfs_write_metadata_to_contents() was using num_header_bytes_at_front to decide how many bytes should be written to the lower filesystem for the file header. Unfortunately, at least 8K was being written from the page, despite the chance of the single, zeroed page being smaller than 8K. This resulted in random areas of kernel memory being written between the 0x1000 and 0x1FFF bytes offsets in the eCryptfs file headers if PAGE_SIZE was 4K. This patch allocates a variable number of pages, calculated with num_header_bytes_at_front, and passes the number of allocated pages along to ecryptfs_write_metadata_to_contents(). Thanks to Florian Streibelt for reporting the data leak and working with me to find the problem. 2.6.28 is the only kernel release with this vulnerability. Corresponds to CVE-2009-0787 Signed-off-by: Tyler Hicks <tyhicks@linux.vnet.ibm.com> Acked-by: Dustin Kirkland <kirkland@canonical.com> Reviewed-by: Eric Sandeen <sandeen@redhat.com> Reviewed-by: Eugene Teo <eugeneteo@kernel.sg> Cc: Greg KH <greg@kroah.com> Cc: dann frazier <dannf@dannf.org> Cc: Serge E. Hallyn <serue@us.ibm.com> Cc: Florian Streibelt <florian@f-streibelt.de> Cc: stable@kernel.org Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* eCryptfs: don't encrypt file key with filename keyTyler Hicks2009-03-141-0/+2
| | | | | | | | | | | | | | | | | | | | eCryptfs has file encryption keys (FEK), file encryption key encryption keys (FEKEK), and filename encryption keys (FNEK). The per-file FEK is encrypted with one or more FEKEKs and stored in the header of the encrypted file. I noticed that the FEK is also being encrypted by the FNEK. This is a problem if a user wants to use a different FNEK than their FEKEK, as their file contents will still be accessible with the FNEK. This is a minimalistic patch which prevents the FNEKs signatures from being copied to the inode signatures list. Ultimately, it keeps the FEK from being encrypted with a FNEK. Signed-off-by: Tyler Hicks <tyhicks@linux.vnet.ibm.com> Cc: Serge Hallyn <serue@us.ibm.com> Acked-by: Dustin Kirkland <kirkland@canonical.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* eCryptfs: Regression in unencrypted filename symlinksTyler Hicks2009-02-071-2/+2
| | | | | | | | | | | | | | The addition of filename encryption caused a regression in unencrypted filename symlink support. ecryptfs_copy_filename() is used when dealing with unencrypted filenames and it reported that the new, copied filename was a character longer than it should have been. This caused the return value of readlink() to count the NULL byte of the symlink target. Most applications don't care about the extra NULL byte, but a version control system (bzr) helped in discovering the bug. Signed-off-by: Tyler Hicks <tyhicks@linux.vnet.ibm.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* eCryptfs: Clean up ecryptfs_decode_from_filename()Michael Halcrow2009-01-071-27/+24
| | | | | | | | | | | | | Flesh out the comments for ecryptfs_decode_from_filename(). Remove the return condition, since it is always 0. Signed-off-by: Michael Halcrow <mhalcrow@us.ibm.com> Cc: Dustin Kirkland <dustin.kirkland@gmail.com> Cc: Eric Sandeen <sandeen@redhat.com> Cc: Tyler Hicks <tchicks@us.ibm.com> Cc: David Kleikamp <shaggy@us.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* eCryptfs: Fix data types (int/size_t)Michael Halcrow2009-01-071-2/+2
| | | | | | | | | | | | | | | Correct several format string data type specifiers. Correct filename size data types; they should be size_t rather than int when passed as parameters to some other functions (although note that the filenames will never be larger than int). Signed-off-by: Michael Halcrow <mhalcrow@us.ibm.com> Cc: Dustin Kirkland <dustin.kirkland@gmail.com> Cc: Eric Sandeen <sandeen@redhat.com> Cc: Tyler Hicks <tchicks@us.ibm.com> Cc: David Kleikamp <shaggy@us.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* eCryptfs: Replace %Z with %zMichael Halcrow2009-01-071-4/+4
| | | | | | | | | | | | %Z is a gcc-ism. Using %z instead. Signed-off-by: Michael Halcrow <mhalcrow@us.ibm.com> Cc: Dustin Kirkland <dustin.kirkland@gmail.com> Cc: Eric Sandeen <sandeen@redhat.com> Cc: Tyler Hicks <tchicks@us.ibm.com> Cc: David Kleikamp <shaggy@us.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* eCryptfs: Filename Encryption: filldir, lookup, and readlinkMichael Halcrow2009-01-071-94/+13
| | | | | | | | | | | | | | | Make the requisite modifications to ecryptfs_filldir(), ecryptfs_lookup(), and ecryptfs_readlink() to call out to filename encryption functions. Propagate filename encryption policy flags from mount-wide crypt_stat to inode crypt_stat. Signed-off-by: Michael Halcrow <mhalcrow@us.ibm.com> Cc: Dustin Kirkland <dustin.kirkland@gmail.com> Cc: Eric Sandeen <sandeen@redhat.com> Cc: Tyler Hicks <tchicks@us.ibm.com> Cc: David Kleikamp <shaggy@us.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* eCryptfs: Filename Encryption: Encoding and encryption functionsMichael Halcrow2009-01-071-0/+433
| | | | | | | | | | | | | | | These functions support encrypting and encoding the filename contents. The encrypted filename contents may consist of any ASCII characters. This patch includes a custom encoding mechanism to map the ASCII characters to a reduced character set that is appropriate for filenames. Signed-off-by: Michael Halcrow <mhalcrow@us.ibm.com> Cc: Dustin Kirkland <dustin.kirkland@gmail.com> Cc: Eric Sandeen <sandeen@redhat.com> Cc: Tyler Hicks <tchicks@us.ibm.com> Cc: David Kleikamp <shaggy@us.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* eCryptfs: Filename Encryption: Header updatesMichael Halcrow2009-01-071-2/+2
| | | | | | | | | | | | Extensions to the header file to support filename encryption. Signed-off-by: Michael Halcrow <mhalcrow@us.ibm.com> Cc: Dustin Kirkland <dustin.kirkland@gmail.com> Cc: Eric Sandeen <sandeen@redhat.com> Cc: Tyler Hicks <tchicks@us.ibm.com> Cc: David Kleikamp <shaggy@us.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* eCryptfs: Filename Encryption: Tag 70 packetsMichael Halcrow2009-01-071-5/+6
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This patchset implements filename encryption via a passphrase-derived mount-wide Filename Encryption Key (FNEK) specified as a mount parameter. Each encrypted filename has a fixed prefix indicating that eCryptfs should try to decrypt the filename. When eCryptfs encounters this prefix, it decodes the filename into a tag 70 packet and then decrypts the packet contents using the FNEK, setting the filename to the decrypted filename. Both unencrypted and encrypted filenames can reside in the same lower filesystem. Because filename encryption expands the length of the filename during the encoding stage, eCryptfs will not properly handle filenames that are already near the maximum filename length. In the present implementation, eCryptfs must be able to produce a match against the lower encrypted and encoded filename representation when given a plaintext filename. Therefore, two files having the same plaintext name will encrypt and encode into the same lower filename if they are both encrypted using the same FNEK. This can be changed by finding a way to replace the prepended bytes in the blocked-aligned filename with random characters; they are hashes of the FNEK right now, so that it is possible to deterministically map from a plaintext filename to an encrypted and encoded filename in the lower filesystem. An implementation using random characters will have to decode and decrypt every single directory entry in any given directory any time an event occurs wherein the VFS needs to determine whether a particular file exists in the lower directory and the decrypted and decoded filenames have not yet been extracted for that directory. Thanks to Tyler Hicks and David Kleikamp for assistance in the development of this patchset. This patch: A tag 70 packet contains a filename encrypted with a Filename Encryption Key (FNEK). This patch implements functions for writing and parsing tag 70 packets. This patch also adds definitions and extends structures to support filename encryption. Signed-off-by: Michael Halcrow <mhalcrow@us.ibm.com> Cc: Dustin Kirkland <dustin.kirkland@gmail.com> Cc: Eric Sandeen <sandeen@redhat.com> Cc: Tyler Hicks <tchicks@us.ibm.com> Cc: David Kleikamp <shaggy@us.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* ecryptfs: fix memory corruption when storing crypto info in xattrsEric Sandeen2008-10-301-7/+8
| | | | | | | | | | | | | | | | | | | | | | | | | | When ecryptfs allocates space to write crypto headers into, before copying it out to file headers or to xattrs, it looks at the value of crypt_stat->num_header_bytes_at_front to determine how much space it needs. This is also used as the file offset to the actual encrypted data, so for xattr-stored crypto info, the value was zero. So, we kzalloc'd 0 bytes, and then ran off to write to that memory. (Which returned as ZERO_SIZE_PTR, so we explode quickly). The right answer is to always allocate a page to write into; the current code won't ever write more than that (this is enforced by the (PAGE_CACHE_SIZE - offset) length in the call to ecryptfs_generate_key_packet_set). To be explicit about this, we now send in a "max" parameter, rather than magically using PAGE_CACHE_SIZE there. Also, since the pointer we pass down the callchain eventually gets the virt_to_page() treatment, we should be using a alloc_page variant, not kzalloc (see also 7fcba054373d5dfc43d26e243a5c9b92069972ee) Signed-off-by: Eric Sandeen <sandeen@redhat.com> Acked-by: Michael Halcrow <mhalcrow@us.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* eCryptfs: use page_alloc not kmalloc to get a page of memoryEric Sandeen2008-07-291-12/+18
| | | | | | | | | | | | | | | | | | | | With SLUB debugging turned on in 2.6.26, I was getting memory corruption when testing eCryptfs. The root cause turned out to be that eCryptfs was doing kmalloc(PAGE_CACHE_SIZE); virt_to_page() and treating that as a nice page-aligned chunk of memory. But at least with SLUB debugging on, this is not always true, and the page we get from virt_to_page does not necessarily match the PAGE_CACHE_SIZE worth of memory we got from kmalloc. My simple testcase was 2 loops doing "rm -f fileX; cp /tmp/fileX ." for 2 different multi-megabyte files. With this change I no longer see the corruption. Signed-off-by: Eric Sandeen <sandeen@redhat.com> Acked-by: Michael Halcrow <mhalcrow@us.ibm.com> Acked-by: Rik van Riel <riel@redhat.com> Cc: <stable@kernel.org> [2.6.25.x, 2.6.26.x] Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* ecryptfs: crypto.c use unaligned byteorder helpersHarvey Harrison2008-07-241-23/+14
| | | | | | | | | | | | | | | | | | | Fixes the following sparse warnings: fs/ecryptfs/crypto.c:1036:8: warning: cast to restricted __be32 fs/ecryptfs/crypto.c:1038:8: warning: cast to restricted __be32 fs/ecryptfs/crypto.c:1077:10: warning: cast to restricted __be32 fs/ecryptfs/crypto.c:1103:6: warning: incorrect type in assignment (different base types) fs/ecryptfs/crypto.c:1105:6: warning: incorrect type in assignment (different base types) fs/ecryptfs/crypto.c:1124:8: warning: incorrect type in assignment (different base types) fs/ecryptfs/crypto.c:1241:21: warning: incorrect type in assignment (different base types) fs/ecryptfs/crypto.c:1244:30: warning: incorrect type in assignment (different base types) fs/ecryptfs/crypto.c:1414:23: warning: cast to restricted __be32 fs/ecryptfs/crypto.c:1417:32: warning: cast to restricted __be16 Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com> Cc: Michael Halcrow <mhalcrow@us.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* ecryptfs: fix missed mutex_unlockCyrill Gorcunov2008-05-241-1/+1
| | | | | | Cc: Michael Halcrow <mhalcrow@us.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* ecryptfs: replace remaining __FUNCTION__ occurrencesHarvey Harrison2008-04-291-16/+16
| | | | | | | | | __FUNCTION__ is gcc-specific, use __func__ Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com> Cc: Michael Halcrow <mhalcrow@us.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* remove ecryptfs_header_cache_0Adrian Bunk2008-04-291-1/+0
| | | | | | | | | Remove the no longer used ecryptfs_header_cache_0. Signed-off-by: Adrian Bunk <bunk@kernel.org> Cc: Michael Halcrow <mhalcrow@us.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* ecryptfs: check for existing key_tfm at mount timeEric Sandeen2008-02-061-14/+53
| | | | | | | | | | | | | | | | | | | | | | | | Jeff Moyer pointed out that a mount; umount loop of ecryptfs, with the same cipher & other mount options, created a new ecryptfs_key_tfm_cache item each time, and the cache could grow quite large this way. Looking at this with mhalcrow, we saw that ecryptfs_parse_options() unconditionally called ecryptfs_add_new_key_tfm(), which is what was adding these items. Refactor ecryptfs_get_tfm_and_mutex_for_cipher_name() to create a new helper function, ecryptfs_tfm_exists(), which checks for the cipher on the cached key_tfm_list, and sets a pointer to it if it exists. This can then be called from ecryptfs_parse_options(), and new key_tfm's can be added only when a cached one is not found. With list locking changes suggested by akpm. Signed-off-by: Eric Sandeen <sandeen@redhat.com> Cc: Michael Halcrow <mhalcrow@us.ibm.com> Cc: Jeff Moyer <jmoyer@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* eCryptfs: change the type of cipher_code from u16 to u8Trevor Highland2008-02-061-4/+4
| | | | | | | | | | Only the lower byte of cipher_code is ever used, so it makes sense for its type to be u8. Signed-off-by: Trevor Highland <trevor.highland@gmail.com> Cc: Michael Halcrow <mhalcrow@us.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* eCryptfs: Minor fixes to printk messagesMichael Halcrow2008-02-061-3/+4
| | | | | | | | | | The printk statements that result when the user does not have the proper key available could use some refining. Signed-off-by: Mike Halcrow <mhalcrow@us.ibm.com> Cc: Mike Halcrow <mhalcrow@us.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* eCryptfs: set inode key only once per crypto operationTrevor Highland2008-02-061-2/+5
| | | | | | | | | | There is no need to keep re-setting the same key for any given eCryptfs inode. This patch optimizes the use of the crypto API and helps performance a bit. Signed-off-by: Trevor Highland <trevor.highland@gmail.com> Signed-off-by: Michael Halcrow <mhalcrow@us.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* eCryptfs: track header bytes rather than extentsMichael Halcrow2008-02-061-63/+35
| | | | | | | | | | Remove internal references to header extents; just keep track of header bytes instead. Headers can easily span multiple pages with the recent persistent file changes. Signed-off-by: Michael Halcrow <mhalcrow@us.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* fs/ecryptfs/: possible cleanupsAdrian Bunk2008-02-061-4/+4
| | | | | | | | | | | | | | | | | | - make the following needlessly global code static: - crypto.c:ecryptfs_lower_offset_for_extent() - crypto.c:key_tfm_list - crypto.c:key_tfm_list_mutex - inode.c:ecryptfs_getxattr() - main.c:ecryptfs_init_persistent_file() - remove the no longer used mmap.c:ecryptfs_lower_page_cache - #if 0 the unused read_write.c:ecryptfs_read() Signed-off-by: Adrian Bunk <bunk@kernel.org> Cc: Michael Halcrow <mhalcrow@us.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* ecryptfs: fix unlocking in error pathsEric Sandeen2007-12-231-4/+4
| | | | | | | | | | | | Thanks to Josef Bacik for finding these. A couple of ecryptfs error paths don't properly unlock things they locked. Signed-off-by: Eric Sandeen <sandeen@redhat.com> Cc: Josef Bacik <jbacik@redhat.com> Cc: Michael Halcrow <mhalcrow@us.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* ecryptfs: fix string overflow on long cipher namesEric Sandeen2007-12-231-0/+1
| | | | | | | | | | | Passing a cipher name > 32 chars on mount results in an overflow when the cipher name is printed, because the last character in the struct ecryptfs_key_tfm's cipher_name string was never zeroed. Signed-off-by: Eric Sandeen <sandeen@redhat.com> Acked-by: Michael Halcrow <mhalcrow@us.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* eCryptfs: release mutex on hash error pathMichael Halcrow2007-11-061-4/+22
| | | | | | | | | | Release the crypt_stat hash mutex on allocation error. Check for error conditions when doing crypto hash calls. Signed-off-by: Michael Halcrow <mhalcrow@us.ibm.com> Reported-by: Kazuki Ohta <kazuki.ohta@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* eCryptfs: increment extent_offset once per loop interationMichael Halcrow2007-11-061-2/+0
| | | | | | | | | | The extent_offset is getting incremented twice per loop iteration through any given page. It should only be getting incremented once. This bug should only impact hosts with >4K page sizes. Signed-off-by: Michael Halcrow <mhalcrow@us.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* [CRYPTO] users: Fix up scatterlist conversion errorsHerbert Xu2007-10-271-0/+2
| | | | | | | | | This patch fixes the errors made in the users of the crypto layer during the sg_init_table conversion. It also adds a few conversions that were missing altogether. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: David S. Miller <davem@davemloft.net>
* SG: Change sg_set_page() to take length and offset argumentJens Axboe2007-10-241-16/+7
| | | | | | | | | | Most drivers need to set length and offset as well, so may as well fold those three lines into one. Add sg_assign_page() for those two locations that only needed to set the page, where the offset/length is set outside of the function context. Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
* Update fs/ to use sg helpersJens Axboe2007-10-221-5/+11
| | | | Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
* ecryptfs: clean up page flag handlingMichael Halcrow2007-10-161-8/+4
| | | | | | | | | | | | The functions that eventually call down to ecryptfs_read_lower(), ecryptfs_decrypt_page(), and ecryptfs_copy_up_encrypted_with_header() should have the responsibility of managing the page Uptodate status. This patch gets rid of some of the ugliness that resulted from trying to push some of the page flag setting too far down the stack. Signed-off-by: Michael Halcrow <mhalcrow@us.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* eCryptfs: replace magic numbersMichael Halcrow2007-10-161-3/+3
| | | | | | | | Replace some magic numbers with sizeof() equivalents. Signed-off-by: Michael Halcrow <mhalcrow@us.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* eCryptfs: remove unused functions and kmem_cacheMichael Halcrow2007-10-161-150/+0
| | | | | | | | | The switch to read_write.c routines and the persistent file make a number of functions unnecessary. This patch removes them. Signed-off-by: Michael Halcrow <mhalcrow@us.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* eCryptfs: fix data typesMichael Halcrow2007-10-161-10/+11
| | | | | | | | | Update data types and add casts in order to avoid potential overflow issues. Signed-off-by: Michael Halcrow <mhalcrow@us.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* eCryptfs: make open, truncate, and setattr use persistent fileMichael Halcrow2007-10-161-1/+1
| | | | | | | | | | | Rather than open a new lower file for every eCryptfs file that is opened, truncated, or setattr'd, instead use the existing lower persistent file for the eCryptfs inode. Change truncate to use read_write.c functions. Change ecryptfs_getxattr() to use the common ecryptfs_getxattr_lower() function. Signed-off-by: Michael Halcrow <mhalcrow@us.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* eCryptfs: update metadata read/write functionsMichael Halcrow2007-10-161-68/+59
| | | | | | | | | | | | Update the metadata read/write functions and grow_file() to use the read_write.c routines. Do not open another lower file; use the persistent lower file instead. Provide a separate function for crypto.c::ecryptfs_read_xattr_region() to get to the lower xattr without having to go through the eCryptfs getxattr. Signed-off-by: Michael Halcrow <mhalcrow@us.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* eCryptfs: replace encrypt, decrypt, and inode size writeMichael Halcrow2007-10-161-192/+235
| | | | | | | | | Replace page encryption and decryption routines and inode size write routine with versions that utilize the read_write.c functions. Signed-off-by: Michael Halcrow <mhalcrow@us.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* eCryptfs: remove assignments in if-statementsMichael Halcrow2007-10-161-7/+10
| | | | | | | | Remove assignments in if-statements. Signed-off-by: Michael Halcrow <mhalcrow@us.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* eCryptfs: remove header_extent_sizeMichael Halcrow2007-10-161-20/+20
| | | | | | | | | | | | There is no point to keeping a separate header_extent_size and an extent_size. The total size of the header can always be represented as some multiple of the regular data extent size. [randy.dunlap@oracle.com: ecryptfs: fix printk format warning] Signed-off-by: Michael Halcrow <mhalcrow@us.ibm.com> Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* eCryptfs: make needlessly global symbols staticMichael Halcrow2007-10-161-4/+4
| | | | | | | | | | | | | Andrew Morton wrote: > Please check that all the newly-added global symbols do indeed need > to be global. Change symbols in keystore.c and crypto.o to static if they do not need to be global. Signed-off-by: Michael Halcrow <mhalcrow@us.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* eCryptfs: kerneldoc fixes for crypto.c and keystore.cMichael Halcrow2007-10-161-17/+52
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Andrew Morton wrote: From: mhalcrow@us.ibm.com <mhalcrow@halcrow.austin.ibm.com> > > +/** > > + * decrypt_passphrase_encrypted_session_key - Decrypt the session key > > + * with the given auth_tok. > > * > > * Returns Zero on success; non-zero error otherwise. > > */ > > That comment purports to be a kerneldoc-style comment. But > > - kerneldoc doesn't support multiple lines on the introductory line > which identifies the name of the function (alas). So you'll need to > overflow 80 cols here. > > - the function args weren't documented > > But the return value is! People regularly forget to do that. And > they frequently forget to document the locking prerequisites and the > permissible calling contexts (process/might_sleep/hardirq, etc) > > (please check all ecryptfs kerneldoc for this stuff sometime) This patch cleans up some of the existing comments and makes a couple of line break tweaks. There is more work to do to bring eCryptfs into full kerneldoc-compliance. Signed-off-by: Michael Halcrow <mhalcrow@us.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* eCryptfs: grammatical fix (destruct to destroy)Michael Halcrow2007-10-161-4/+4
| | | | | | | | | | | | | Andrew Morton wrote: > > +int ecryptfs_destruct_crypto(void) > > ecryptfs_destroy_crypto would be more grammatically correct ;) Grammatical fix for some function names. Signed-off-by: Michael Halcrow <mhalcrow@us.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* eCryptfs: collapse flag set into one statementMichael Halcrow2007-10-161-2/+1
| | | | | | | | | | | | | | | | Andrew Morton wrote: > > + crypt_stat->flags |= ECRYPTFS_ENCRYPTED; > > + crypt_stat->flags |= ECRYPTFS_KEY_VALID; > > Maybe the compiler can optimise those two statements, but we'd > normally provide it with some manual help. This patch provides the compiler with some manual help for optimizing the setting of some flags. Signed-off-by: Michael Halcrow <mhalcrow@us.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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