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2012-11-18fanotify: fix FAN_Q_OVERFLOW case of fanotify_read()Al Viro1-1/+2
If the FAN_Q_OVERFLOW bit set in event->mask, the fanotify event metadata will not contain a valid file descriptor, but copy_event_to_user() didn't check for that, and unconditionally does a fd_install() on the file descriptor. Which in turn will cause a BUG_ON() in __fd_install(). Introduced by commit 352e3b249284 ("fanotify: sanitize failure exits in copy_event_to_user()") Mea culpa - missed that path ;-/ Reported-by: Alex Shi <lkml.alex@gmail.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2012-11-09fanotify: fix missing breakEric Paris1-0/+1
Anders Blomdell noted in 2010 that Fanotify lost events and provided a test case. Eric Paris confirmed it was a bug and posted a fix to the list https://groups.google.com/forum/?fromgroups=#!topic/linux.kernel/RrJfTfyW2BE but never applied it. Repeated attempts over time to actually get him to apply it have never had a reply from anyone who has raised it So apply it anyway Signed-off-by: Alan Cox <alan@linux.intel.com> Reported-by: Anders Blomdell <anders.blomdell@control.lth.se> Cc: Eric Paris <eparis@redhat.com> Cc: <stable@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2012-09-26switch simple cases of fget_light to fdgetAl Viro2-29/+27
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-09-26fanotify: sanitize failure exits in copy_event_to_user()Al Viro1-39/+20
* do copy_to_user() before prepare_for_access_response(); that kills the need in remove_access_response(). * don't do fd_install() until we are past the last possible failure exit. Don't use sys_close() on cleanup side - just put_unused_fd() and fput(). Less racy that way... Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-07-23switch dentry_open() to struct path, make it grab references itselfAl Viro1-6/+2
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-07-14vfs: switch i_dentry/d_alias to hlistAl Viro1-1/+2
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-05-30fsnotify: remove unused parameter from send_to_group()Dan Carpenter1-6/+6
We don't use "mnt" anymore in send_to_group() after 1968f5eed5 ("fanotify: use both marks when possible") was applied. Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> Cc: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-03-23fs/notify/notification.c: make subsys_initcall function staticH Hartley Sweeten1-2/+1
Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com> Cc: Eric Dumazet <eric.dumazet@gmail.com> Cc: Mike Frysinger <vapier@gentoo.org> Cc: Arun Sharma <asharma@fb.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2012-01-14fsnotify: don't BUG in fsnotify_destroy_mark()Miklos Szeredi1-3/+5
Removing the parent of a watched file results in "kernel BUG at fs/notify/mark.c:139". To reproduce add "-w /tmp/audit/dir/watched_file" to audit.rules rm -rf /tmp/audit/dir This is caused by fsnotify_destroy_mark() being called without an extra reference taken by the caller. Reported by Francesco Cosoleto here: https://bugzilla.novell.com/show_bug.cgi?id=689860 Fix by removing the BUG_ON and adding a comment about not accessing mark after the iput. Signed-off-by: Miklos Szeredi <mszeredi@suse.cz> CC: stable@vger.kernel.org Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2012-01-03vfs: move fsnotify junk to struct mountAl Viro3-13/+21
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2011-07-26atomic: use <linux/atomic.h>Arun Sharma5-5/+5
This allows us to move duplicated code in <asm/atomic.h> (atomic_inc_not_zero() for now) to <linux/atomic.h> Signed-off-by: Arun Sharma <asharma@fb.com> Reviewed-by: Eric Dumazet <eric.dumazet@gmail.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: David Miller <davem@davemloft.net> Cc: Eric Dumazet <eric.dumazet@gmail.com> Acked-by: Mike Frysinger <vapier@gentoo.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2011-04-07Merge branch 'for-linus2' of git://git.profusion.mobi/users/lucas/linux-2.6Linus Torvalds3-3/+3
* 'for-linus2' of git://git.profusion.mobi/users/lucas/linux-2.6: Fix common misspellings
2011-04-05inotify: fix double free/corruption of stuct userEric Paris2-26/+14
On an error path in inotify_init1 a normal user can trigger a double free of struct user. This is a regression introduced by a2ae4cc9a16e ("inotify: stop kernel memory leak on file creation failure"). We fix this by making sure that if a group exists the user reference is dropped when the group is cleaned up. We should not explictly drop the reference on error and also drop the reference when the group is cleaned up. The new lifetime rules are that an inotify group lives from inotify_new_group to the last fsnotify_put_group. Since the struct user and inotify_devs are directly tied to this lifetime they are only changed/updated in those two locations. We get rid of all special casing of struct user or user->inotify_devs. Signed-off-by: Eric Paris <eparis@redhat.com> Cc: stable@kernel.org (2.6.37 and up) Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2011-03-31Fix common misspellingsLucas De Marchi3-3/+3
Fixes generated by 'codespell' and manually reviewed. Signed-off-by: Lucas De Marchi <lucas.demarchi@profusion.mobi>
2011-03-24fs: rename inode_lock to inode_hash_lockDave Chinner3-3/+0
All that remains of the inode_lock is protecting the inode hash list manipulation and traversals. Rename the inode_lock to inode_hash_lock to reflect it's actual function. Signed-off-by: Dave Chinner <dchinner@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2011-03-24fs: move i_sb_list out from under inode_lockDave Chinner1-10/+10
Protect the per-sb inode list with a new global lock inode_sb_list_lock and use it to protect the list manipulations and traversals. This lock replaces the inode_lock as the inodes on the list can be validity checked while holding the inode->i_lock and hence the inode_lock is no longer needed to protect the list. Signed-off-by: Dave Chinner <dchinner@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2011-03-24fs: protect inode->i_state with inode->i_lockDave Chinner1-6/+15
Protect inode state transitions and validity checks with the inode->i_lock. This enables us to make inode state transitions independently of the inode_lock and is the first step to peeling away the inode_lock from the code. This requires that __iget() is done atomically with i_state checks during list traversals so that we don't race with another thread marking the inode I_FREEING between the state check and grabbing the reference. Also remove the unlock_new_inode() memory barrier optimisation required to avoid taking the inode_lock when clearing I_NEW. Simplify the code by simply taking the inode->i_lock around the state change and wakeup. Because the wakeup is no longer tricky, remove the wake_up_inode() function and open code the wakeup where necessary. Signed-off-by: Dave Chinner <dchinner@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2011-03-01Remove one to many n's in a wordJustin P. Mattock2-2/+2
Signed-off-by: Justin P. Mattock <justinmattock@gmail.com> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
2011-01-13Merge branch 'for-next' of ↵Linus Torvalds1-1/+1
git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial * 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial: (43 commits) Documentation/trace/events.txt: Remove obsolete sched_signal_send. writeback: fix global_dirty_limits comment runtime -> real-time ppc: fix comment typo singal -> signal drivers: fix comment typo diable -> disable. m68k: fix comment typo diable -> disable. wireless: comment typo fix diable -> disable. media: comment typo fix diable -> disable. remove doc for obsolete dynamic-printk kernel-parameter remove extraneous 'is' from Documentation/iostats.txt Fix spelling milisec -> ms in snd_ps3 module parameter description Fix spelling mistakes in comments Revert conflicting V4L changes i7core_edac: fix typos in comments mm/rmap.c: fix comment sound, ca0106: Fix assignment to 'channel'. hrtimer: fix a typo in comment init/Kconfig: fix typo anon_inodes: fix wrong function name in comment fix comment typos concerning "consistent" poll: fix a typo in comment ... Fix up trivial conflicts in: - drivers/net/wireless/iwlwifi/iwl-core.c (moved to iwl-legacy.c) - fs/ext4/ext4.h Also fix missed 'diabled' typo in drivers/net/bnx2x/bnx2x.h while at it.
2011-01-07fs: dcache per-inode inode alias lockingNick Piggin1-2/+2
dcache_inode_lock can be replaced with per-inode locking. Use existing inode->i_lock for this. This is slightly non-trivial because we sometimes need to find the inode from the dentry, which requires d_inode to be stabilised (either with refcount or d_lock). Signed-off-by: Nick Piggin <npiggin@kernel.dk>
2011-01-07fs: dcache remove dcache_lockNick Piggin1-2/+0
dcache_lock no longer protects anything. remove it. Signed-off-by: Nick Piggin <npiggin@kernel.dk>
2011-01-07fs: scale inode alias listNick Piggin1-0/+2
Add a new lock, dcache_inode_lock, to protect the inode's i_dentry list from concurrent modification. d_alias is also protected by d_lock. Signed-off-by: Nick Piggin <npiggin@kernel.dk>
2011-01-07fs: dcache scale subdirsNick Piggin1-1/+3
Protect d_subdirs and d_child with d_lock, except in filesystems that aren't using dcache_lock for these anyway (eg. using i_mutex). Note: if we change the locking rule in future so that ->d_child protection is provided only with ->d_parent->d_lock, it may allow us to reduce some locking. But it would be an exception to an otherwise regular locking scheme, so we'd have to see some good results. Probably not worthwhile. Signed-off-by: Nick Piggin <npiggin@kernel.dk>
2010-12-22Merge branch 'master' into for-nextJiri Kosina3-31/+57
Conflicts: MAINTAINERS arch/arm/mach-omap2/pm24xx.c drivers/scsi/bfa/bfa_fcpim.c Needed to update to apply fixes for which the old branch was too outdated.
2010-12-15fanotify: fill in the metadata_len field on struct fanotify_event_metadataEric Paris1-2/+4
The fanotify_event_metadata now has a field which is supposed to indicate the length of the metadata portion of the event. Fill in that field as well. Based-in-part-on-patch-by: Alexey Zaytsev <alexey.zaytsev@gmail.com> Signed-off-by: Eric Paris <eparis@redhat.com>
2010-12-07fanotify: Dont try to open a file descriptor for the overflow eventLino Sanfilippo1-4/+13
We should not try to open a file descriptor for the overflow event since this will always fail. Signed-off-by: Lino Sanfilippo <LinoSanfilippo@gmx.de> Signed-off-by: Eric Paris <eparis@redhat.com>
2010-12-07fanotify: do not leak user reference on allocation failureEric Paris1-1/+3
If fanotify_init is unable to allocate a new fsnotify group it will return but will not drop its reference on the associated user struct. Drop that reference on error. Reported-by: Vegard Nossum <vegard.nossum@gmail.com> Signed-off-by: Eric Paris <eparis@redhat.com>
2010-12-07inotify: stop kernel memory leak on file creation failureEric Paris1-0/+1
If inotify_init is unable to allocate a new file for the new inotify group we leak the new group. This patch drops the reference on the group on file allocation failure. Reported-by: Vegard Nossum <vegard.nossum@gmail.com> cc: stable@kernel.org Signed-off-by: Eric Paris <eparis@redhat.com>
2010-12-07fanotify: on group destroy allow all waiters to bypass permission checkLino Sanfilippo2-3/+8
When fanotify_release() is called, there may still be processes waiting for access permission. Currently only processes for which an event has already been queued into the groups access list will be woken up. Processes for which no event has been queued will continue to sleep and thus cause a deadlock when fsnotify_put_group() is called. Furthermore there is a race allowing further processes to be waiting on the access wait queue after wake_up (if they arrive before clear_marks_by_group() is called). This patch corrects this by setting a flag to inform processes that the group is about to be destroyed and thus not to wait for access permission. [additional changelog from eparis] Lets think about the 4 relevant code paths from the PoV of the 'operator' 'listener' 'responder' and 'closer'. Where operator is the process doing an action (like open/read) which could require permission. Listener is the task (or in this case thread) slated with reading from the fanotify file descriptor. The 'responder' is the thread responsible for responding to access requests. 'Closer' is the thread attempting to close the fanotify file descriptor. The 'operator' is going to end up in: fanotify_handle_event() get_response_from_access() (THIS BLOCKS WAITING ON USERSPACE) The 'listener' interesting code path fanotify_read() copy_event_to_user() prepare_for_access_response() (THIS CREATES AN fanotify_response_event) The 'responder' code path: fanotify_write() process_access_response() (REMOVE A fanotify_response_event, SET RESPONSE, WAKE UP 'operator') The 'closer': fanotify_release() (SUPPOSED TO CLEAN UP THE REST OF THIS MESS) What we have today is that in the closer we remove all of the fanotify_response_events and set a bit so no more response events are ever created in prepare_for_access_response(). The bug is that we never wake all of the operators up and tell them to move along. You fix that in fanotify_get_response_from_access(). You also fix other operators which haven't gotten there yet. So I agree that's a good fix. [/additional changelog from eparis] [remove additional changes to minimize patch size] [move initialization so it was inside CONFIG_FANOTIFY_PERMISSION] Signed-off-by: Lino Sanfilippo <LinoSanfilippo@gmx.de> Signed-off-by: Eric Paris <eparis@redhat.com>
2010-12-07fanotify: Dont allow a mask of 0 if setting or removing a markLino Sanfilippo1-1/+3
In mark_remove_from_mask() we destroy marks that have their event mask cleared. Thus we should not allow the creation of those marks in the first place. With this patch we check if the mask given from user is 0 in case of FAN_MARK_ADD. If so we return an error. Same for FAN_MARK_REMOVE since this does not have any effect. Signed-off-by: Lino Sanfilippo <LinoSanfilippo@gmx.de> Signed-off-by: Eric Paris <eparis@redhat.com>
2010-12-07fanotify: correct broken ref counting in case adding a mark failedLino Sanfilippo1-17/+14
If adding a mount or inode mark failed fanotify_free_mark() is called explicitly. But at this time the mark has already been put into the destroy list of the fsnotify_mark kernel thread. If the thread is too slow it will try to decrease the reference of a mark, that has already been freed by fanotify_free_mark(). (If its fast enough it will only decrease the marks ref counter from 2 to 1 - note that the counter has been increased to 2 in add_mark() - which has practically no effect.) This patch fixes the ref counting by not calling free_mark() explicitly, but decreasing the ref counter and rely on the fsnotify_mark thread to cleanup in case adding the mark has failed. Signed-off-by: Lino Sanfilippo <LinoSanfilippo@gmx.de> Signed-off-by: Eric Paris <eparis@redhat.com>
2010-12-07fanotify: deny permissions when no event was sentEric Paris1-4/+12
If no event was sent to userspace we cannot expect userspace to respond to permissions requests. Today such requests just hang forever. This patch will deny any permissions event which was unable to be sent to userspace. Reported-by: Tvrtko Ursulin <tvrtko.ursulin@sophos.com> Signed-off-by: Eric Paris <eparis@redhat.com>
2010-11-01Kconfig: typo: and -> anMichael Witten1-1/+1
Signed-off-by: Michael Witten <mfwitten@gmail.com> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
2010-10-30make fanotify_read() restartable across signalsLino Sanfilippo1-1/+1
In fanotify_read() return -ERESTARTSYS instead of -EINTR to make read() restartable across signals (BSD semantic). Signed-off-by: Eric Paris <eparis@redhat.com>
2010-10-28fs/notify/fanotify/fanotify_user.c: fix warningsAndrew Morton1-3/+2
fs/notify/fanotify/fanotify_user.c: In function 'fanotify_release': fs/notify/fanotify/fanotify_user.c:375: warning: unused variable 'lre' fs/notify/fanotify/fanotify_user.c:375: warning: unused variable 're' this is really ugly. Cc: Eric Paris <eparis@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Eric Paris <eparis@redhat.com>
2010-10-28fanotify: do not recalculate the mask if the ignored mask changedEric Paris1-3/+3
If fanotify sets a new bit in the ignored mask it will cause the generic fsnotify layer to recalculate the real mask. This is stupid since we didn't change that part. Signed-off-by: Eric Paris <eparis@redhat.com>
2010-10-28fanotify: ignore events on directories unless specifically requestedEric Paris2-0/+17
fanotify has a very limited number of events it sends on directories. The usefulness of these events is yet to be seen and still we send them. This is particularly painful for mount marks where one might receive many of these useless events. As such this patch will drop events on IS_DIR() inodes unless they were explictly requested with FAN_ON_DIR. This means that a mark on a directory without FAN_EVENT_ON_CHILD or FAN_ON_DIR is meaningless and will result in no events ever (although it will still be allowed since detecting it is hard) Signed-off-by: Eric Paris <eparis@redhat.com>
2010-10-28fsnotify: rename FS_IN_ISDIR to FS_ISDIREric Paris1-1/+1
The _IN_ in the naming is reserved for flags only used by inotify. Since I am about to use this flag for fanotify rename it to be generic like the rest. Signed-off-by: Eric Paris <eparis@redhat.com>
2010-10-28fanotify: do not send events for irregular filesEric Paris1-5/+6
fanotify_should_send_event has a test to see if an object is a file or directory and does not send an event otherwise. The problem is that the test is actually checking if the object with a mark is a file or directory, not if the object the event happened on is a file or directory. We should check the latter. Signed-off-by: Eric Paris <eparis@redhat.com>
2010-10-28fanotify: limit number of listeners per userEric Paris2-1/+21
fanotify currently has no limit on the number of listeners a given user can have open. This patch limits the total number of listeners per user to 128. This is the same as the inotify default limit. Signed-off-by: Eric Paris <eparis@redhat.com>
2010-10-28fanotify: allow userspace to override max marksEric Paris1-1/+8
Some fanotify groups, especially those like AV scanners, will need to place lots of marks, particularly ignore marks. Since ignore marks do not pin inodes in cache and are cleared if the inode is removed from core (usually under memory pressure) we expose an interface for listeners, with CAP_SYS_ADMIN, to override the maximum number of marks and be allowed to set and 'unlimited' number of marks. Programs which make use of this feature will be able to OOM a machine. Signed-off-by: Eric Paris <eparis@redhat.com>
2010-10-28fanotify: limit the number of marks in a single fanotify groupEric Paris1-0/+9
There is currently no limit on the number of marks a given fanotify group can have. Since fanotify is gated on CAP_SYS_ADMIN this was not seen as a serious DoS threat. This patch implements a default of 8192, the same as inotify to work towards removing the CAP_SYS_ADMIN gating and eliminating the default DoS'able status. Signed-off-by: Eric Paris <eparis@redhat.com>
2010-10-28fanotify: allow userspace to override max queue depthEric Paris1-1/+8
fanotify has a defualt max queue depth. This patch allows processes which explicitly request it to have an 'unlimited' queue depth. These processes need to be very careful to make sure they cannot fall far enough behind that they OOM the box. Thus this flag is gated on CAP_SYS_ADMIN. Signed-off-by: Eric Paris <eparis@redhat.com>
2010-10-28fsnotify: implement a default maximum queue depthEric Paris1-0/+4
Currently fanotify has no maximum queue depth. Since fanotify is CAP_SYS_ADMIN only this does not pose a normal user DoS issue, but it certianly is possible that an fanotify listener which can't keep up could OOM the box. This patch implements a default 16k depth. This is the same default depth used by inotify, but given fanotify's better queue merging in many situations this queue will contain many additional useful events by comparison. Signed-off-by: Eric Paris <eparis@redhat.com>
2010-10-28fanotify: ignore fanotify ignore marks if open writersEric Paris1-0/+10
fanotify will clear ignore marks if a task changes the contents of an inode. The problem is with the races around when userspace finishes checking a file and when that result is actually attached to the inode. This race was described as such: Consider the following scenario with hostile processes A and B, and victim process C: 1. Process A opens new file for writing. File check request is generated. 2. File check is performed in userspace. Check result is "file has no malware". 3. The "permit" response is delivered to kernel space. 4. File ignored mark set. 5. Process A writes dummy bytes to the file. File ignored flags are cleared. 6. Process B opens the same file for reading. File check request is generated. 7. File check is performed in userspace. Check result is "file has no malware". 8. Process A writes malware bytes to the file. There is no cached response yet. 9. The "permit" response is delivered to kernel space and is cached in fanotify. 10. File ignored mark set. 11. Now any process C will be permitted to open the malware file. There is a race between steps 8 and 10 While fanotify makes no strong guarantees about systems with hostile processes there is no reason we cannot harden against this race. We do that by simply ignoring any ignore marks if the inode has open writers (aka i_writecount > 0). (We actually do not ignore ignore marks if the FAN_MARK_SURV_MODIFY flag is set) Reported-by: Vasily Novikov <vasily.novikov@kaspersky.com> Signed-off-by: Eric Paris <eparis@redhat.com>
2010-10-28fsnotify: call fsnotify_parent in perm eventsEric Paris1-6/+9
fsnotify perm events do not call fsnotify parent. That means you cannot register a perm event on a directory and enforce permissions on all inodes in that directory. This patch fixes that situation. Signed-off-by: Eric Paris <eparis@redhat.com>
2010-10-28fsnotify: correctly handle return codes from listenersEric Paris1-8/+12
When fsnotify groups return errors they are ignored. For permissions events these should be passed back up the stack, but for most events these should continue to be ignored. Signed-off-by: Eric Paris <eparis@redhat.com>
2010-10-28fanotify: implement fanotify listener orderingEric Paris1-1/+24
The fanotify listeners needs to be able to specify what types of operations they are going to perform so they can be ordered appropriately between other listeners doing other types of operations. They need this to be able to make sure that things like hierarchichal storage managers will get access to inodes before processes which need the data. This patch defines 3 possible uses which groups must indicate in the fanotify_init() flags. FAN_CLASS_PRE_CONTENT FAN_CLASS_CONTENT FAN_CLASS_NOTIF Groups will receive notification in that order. The order between 2 groups in the same class is undeterministic. FAN_CLASS_PRE_CONTENT is intended to be used by listeners which need access to the inode before they are certain that the inode contains it's final data. A hierarchical storage manager should choose to use this class. FAN_CLASS_CONTENT is intended to be used by listeners which need access to the inode after it contains its intended contents. This would be the appropriate level for an AV solution or document control system. FAN_CLASS_NOTIF is intended for normal async notification about access, much the same as inotify and dnotify. Syncronous permissions events are not permitted at this class. Signed-off-by: Eric Paris <eparis@redhat.com>
2010-10-28fsnotify: implement ordering between notifiersEric Paris2-3/+12
fanotify needs to be able to specify that some groups get events before others. They use this idea to make sure that a hierarchical storage manager gets access to files before programs which actually use them. This is purely infrastructure. Everything will have a priority of 0, but the infrastructure will exist for it to be non-zero. Signed-off-by: Eric Paris <eparis@redhat.com>
2010-10-28fanotify: allow fanotify to be builtEric Paris1-1/+1
We disabled the ability to build fanotify in commit 7c5347733dcc4ba0ba. This reverts that commit and allows people to build fanotify. Signed-off-by: Eric Paris <eparis@redhat.com>
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