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* inotify: Fix reporting of cookies for inotify eventsJan Kara2014-02-181-1/+1
| | | | | | | | | | | | | | | | My rework of handling of notification events (namely commit 7053aee26a35 "fsnotify: do not share events between notification groups") broke sending of cookies with inotify events. We didn't propagate the value passed to fsnotify() properly and passed 4 uninitialized bytes to userspace instead (so it is also an information leak). Sadly I didn't notice this during my testing because inotify cookies aren't used very much and LTP inotify tests ignore them. Fix the problem by passing the cookie value properly. Fixes: 7053aee26a3548ebaba046ae2e52396ccf56ac6c Reported-by: Vegard Nossum <vegard.nossum@oracle.com> Signed-off-by: Jan Kara <jack@suse.cz>
* fsnotify: remove pointless NULL initializersJan Kara2014-01-211-3/+0
| | | | | | | | | | | | | We usually rely on the fact that struct members not specified in the initializer are set to NULL. So do that with fsnotify function pointers as well. Signed-off-by: Jan Kara <jack@suse.cz> Reviewed-by: Christoph Hellwig <hch@lst.de> Cc: Eric Paris <eparis@parisplace.org> Cc: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* fsnotify: remove .should_send_event callbackJan Kara2014-01-211-9/+0
| | | | | | | | | | | | | After removing event structure creation from the generic layer there is no reason for separate .should_send_event and .handle_event callbacks. So just remove the first one. Signed-off-by: Jan Kara <jack@suse.cz> Reviewed-by: Christoph Hellwig <hch@lst.de> Cc: Eric Paris <eparis@parisplace.org> Cc: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* fsnotify: do not share events between notification groupsJan Kara2014-01-211-7/+7
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Currently fsnotify framework creates one event structure for each notification event and links this event into all interested notification groups. This is done so that we save memory when several notification groups are interested in the event. However the need for event structure shared between inotify & fanotify bloats the event structure so the result is often higher memory consumption. Another problem is that fsnotify framework keeps path references with outstanding events so that fanotify can return open file descriptors with its events. This has the undesirable effect that filesystem cannot be unmounted while there are outstanding events - a regression for inotify compared to a situation before it was converted to fsnotify framework. For fanotify this problem is hard to avoid and users of fanotify should kind of expect this behavior when they ask for file descriptors from notified files. This patch changes fsnotify and its users to create separate event structure for each group. This allows for much simpler code (~400 lines removed by this patch) and also smaller event structures. For example on 64-bit system original struct fsnotify_event consumes 120 bytes, plus additional space for file name, additional 24 bytes for second and each subsequent group linking the event, and additional 32 bytes for each inotify group for private data. After the conversion inotify event consumes 48 bytes plus space for file name which is considerably less memory unless file names are long and there are several groups interested in the events (both of which are uncommon). Fanotify event fits in 56 bytes after the conversion (fanotify doesn't care about file names so its events don't have to have it allocated). A win unless there are four or more fanotify groups interested in the event. The conversion also solves the problem with unmount when only inotify is used as we don't have to grab path references for inotify events. [hughd@google.com: fanotify: fix corruption preventing startup] Signed-off-by: Jan Kara <jack@suse.cz> Reviewed-by: Christoph Hellwig <hch@lst.de> Cc: Eric Paris <eparis@parisplace.org> Cc: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Hugh Dickins <hughd@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* audit: catch possible NULL audit buffersKees Cook2013-01-111-0/+2
| | | | | | | | | | | | | | | | | It's possible for audit_log_start() to return NULL. Handle it in the various callers. Signed-off-by: Kees Cook <keescook@chromium.org> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Eric Paris <eparis@redhat.com> Cc: Jeff Layton <jlayton@redhat.com> Cc: "Eric W. Biederman" <ebiederm@xmission.com> Cc: Julien Tinnes <jln@google.com> Cc: Will Drewry <wad@google.com> Cc: Steve Grubb <sgrubb@redhat.com> Cc: Andrea Arcangeli <aarcange@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* Merge branch 'for-next' of git://git.infradead.org/users/eparis/notifyLinus Torvalds2012-12-201-2/+2
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Pull filesystem notification updates from Eric Paris: "This pull mostly is about locking changes in the fsnotify system. By switching the group lock from a spin_lock() to a mutex() we can now hold the lock across things like iput(). This fixes a problem involving unmounting a fs and having inodes be busy, first pointed out by FAT, but reproducible with tmpfs. This also restores signal driven I/O for inotify, which has been broken since about 2.6.32." Ugh. I *hate* the timing of this. It was rebased after the merge window opened, and then left to sit with the pull request coming the day before the merge window closes. That's just crap. But apparently the patches themselves have been around for over a year, just gathering dust, so now it's suddenly critical. Fixed up semantic conflict in fs/notify/fdinfo.c as per Stephen Rothwell's fixes from -next. * 'for-next' of git://git.infradead.org/users/eparis/notify: inotify: automatically restart syscalls inotify: dont skip removal of watch descriptor if creation of ignored event failed fanotify: dont merge permission events fsnotify: make fasync generic for both inotify and fanotify fsnotify: change locking order fsnotify: dont put marks on temporary list when clearing marks by group fsnotify: introduce locked versions of fsnotify_add_mark() and fsnotify_remove_mark() fsnotify: pass group to fsnotify_destroy_mark() fsnotify: use a mutex instead of a spinlock to protect a groups mark list fanotify: add an extra flag to mark_remove_from_mask that indicates wheather a mark should be destroyed fsnotify: take groups mark_lock before mark lock fsnotify: use reference counting for groups fsnotify: introduce fsnotify_get_group() inotify, fanotify: replace fsnotify_put_group() with fsnotify_destroy_group()
| * fsnotify: pass group to fsnotify_destroy_mark()Lino Sanfilippo2012-12-111-2/+2
| | | | | | | | | | | | | | | | In fsnotify_destroy_mark() dont get the group from the passed mark anymore, but pass the group itself as an additional parameter to the function. Signed-off-by: Lino Sanfilippo <LinoSanfilippo@gmx.de> Signed-off-by: Eric Paris <eparis@redhat.com>
* | audit: optimize audit_compare_dname_pathJeff Layton2012-10-121-1/+2
| | | | | | | | | | | | | | | | | | | | In the cases where we already know the length of the parent, pass it as a parm so we don't need to recompute it. In the cases where we don't know the length, pass in AUDIT_NAME_FULL (-1) to indicate that it should be determined. Signed-off-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* | audit: remove dirlen argument to audit_compare_dname_pathJeff Layton2012-10-121-1/+1
| | | | | | | | | | | | | | All the callers set this to NULL now. Signed-off-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* | userns: Convert the audit loginuid to be a kuidEric W. Biederman2012-09-171-1/+1
|/ | | | | | | | | | | | | | | | | | | | | | | Always store audit loginuids in type kuid_t. Print loginuids by converting them into uids in the appropriate user namespace, and then printing the resulting uid. Modify audit_get_loginuid to return a kuid_t. Modify audit_set_loginuid to take a kuid_t. Modify /proc/<pid>/loginuid on read to convert the loginuid into the user namespace of the opener of the file. Modify /proc/<pid>/loginud on write to convert the loginuid rom the user namespace of the opener of the file. Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Eric Paris <eparis@redhat.com> Cc: Paul Moore <paul@paul-moore.com> ? Cc: David Miller <davem@davemloft.net> Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
* get rid of kern_path_parent()Al Viro2012-07-141-22/+3
| | | | | | | | | all callers want the same thing, actually - a kinda-sorta analog of kern_path_create(). I.e. they want parent vfsmount/dentry (with ->i_mutex held, to make sure the child dentry is still their child) + the child dentry. Signed-off-by Al Viro <viro@zeniv.linux.org.uk>
* kill path_lookup()Al Viro2011-03-141-1/+1
| | | | | | | all remaining callers pass LOOKUP_PARENT to it, so flags argument can die; renamed to kern_path_parent() Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* fix race in audit_get_nd()Al Viro2011-03-141-53/+32
| | | | | | don't rely on pathname resolution ending up twice at the same point... Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* audit: make functions staticStephen Hemminger2010-10-301-2/+2
| | | | | | | | | I was doing some namespace checks and found some simple stuff in audit that could be cleaned up. Make some functions static, and put const on make_reply payload arg. Signed-off-by: Stephen Hemminger <shemminger@vyatta.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* Revert "fsnotify: store struct file not struct path"Linus Torvalds2010-08-121-2/+2
| | | | | | | | | | | | | | | This reverts commit 3bcf3860a4ff9bbc522820b4b765e65e4deceb3e (and the accompanying commit c1e5c954020e "vfs/fsnotify: fsnotify_close can delay the final work in fput" that was a horribly ugly hack to make it work at all). The 'struct file' approach not only causes that disgusting hack, it somehow breaks pulseaudio, probably due to some other subtlety with f_count handling. Fix up various conflicts due to later fsnotify work. Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* fanotify: use both marks when possibleEric Paris2010-07-281-1/+1
| | | | | | | | fanotify currently, when given a vfsmount_mark will look up (if it exists) the corresponding inode mark. This patch drops that lookup and uses the mark provided. Signed-off-by: Eric Paris <eparis@redhat.com>
* fsnotify: pass both the vfsmount mark and inode markEric Paris2010-07-281-3/+5
| | | | | | | | should_send_event() and handle_event() will both need to look up the inode event if they get a vfsmount event. Lets just pass both at the same time since we have them both after walking the lists in lockstep. Signed-off-by: Eric Paris <eparis@redhat.com>
* fsnotify: remove group->maskEric Paris2010-07-281-8/+0
| | | | | | | group->mask is now useless. It was originally a shortcut for fsnotify to save on performance. These checks are now redundant, so we remove them. Signed-off-by: Eric Paris <eparis@redhat.com>
* fsnotify: cleanup should_send_eventEric Paris2010-07-281-6/+1
| | | | | | | | The change to use srcu and walk the object list rather than the global fsnotify_group list means that should_send_event is no longer needed for a number of groups and can be simplified for others. Do that. Signed-off-by: Eric Paris <eparis@redhat.com>
* audit: use the mark in handler functionsEric Paris2010-07-281-17/+3
| | | | | | | | audit now gets a mark in the should_send_event and handle_event functions. Rather than look up the mark themselves audit should just use the mark it was handed. Signed-off-by: Eric Paris <eparis@redhat.com>
* fsnotify: send fsnotify_mark to groups in event handling functionsEric Paris2010-07-281-3/+5
| | | | | | | | | With the change of fsnotify to use srcu walking the marks list instead of walking the global groups list we now know the mark in question. The code can send the mark to the group's handling functions and the groups won't have to find those marks themselves. Signed-off-by: Eric Paris <eparis@redhat.com>
* fsnotify: store struct file not struct pathEric Paris2010-07-281-2/+2
| | | | | | | | | Al explains that calling dentry_open() with a mnt/dentry pair is only garunteed to be safe if they are already used in an open struct file. To make sure this is the case don't store and use a struct path in fsnotify, always use a struct file. Signed-off-by: Eric Paris <eparis@redhat.com>
* fsnotify: split generic and inode specific mark codeEric Paris2010-07-281-3/+3
| | | | | | | | currently all marking is done by functions in inode-mark.c. Some of this is pretty generic and should be instead done in a generic function and we should only put the inode specific code in inode-mark.c Signed-off-by: Eric Paris <eparis@redhat.com>
* fsnotify: take inode->i_lock inside fsnotify_find_mark_entry()Andreas Gruenbacher2010-07-281-5/+0
| | | | | | | | | All callers to fsnotify_find_mark_entry() except one take and release inode->i_lock around the call. Take the lock inside fsnotify_find_mark_entry() instead. Signed-off-by: Andreas Gruenbacher <agruen@suse.de> Signed-off-by: Eric Paris <eparis@redhat.com>
* fsnotify: rename fsnotify_find_mark_entry to fsnotify_find_markEric Paris2010-07-281-4/+4
| | | | | | the _entry portion of fsnotify functions is useless. Drop it. Signed-off-by: Eric Paris <eparis@redhat.com>
* fsnotify: rename fsnotify_mark_entry to just fsnotify_markEric Paris2010-07-281-4/+4
| | | | | | | The name is long and it serves no real purpose. So rename fsnotify_mark_entry to just fsnotify_mark. Signed-off-by: Eric Paris <eparis@redhat.com>
* fsnotify: include vfsmount in should_send_event when appropriateEric Paris2010-07-281-1/+2
| | | | | | | | | To ensure that a group will not duplicate events when it receives it based on the vfsmount and the inode should_send_event test we should distinguish those two cases. We pass a vfsmount to this function so groups can make their own determinations. Signed-off-by: Eric Paris <eparis@redhat.com>
* fsnotify: drop mask argument from fsnotify_alloc_groupEric Paris2010-07-281-1/+1
| | | | | | | Nothing uses the mask argument to fsnotify_alloc_group. This patch drops that argument. Signed-off-by: Eric Paris <eparis@redhat.com>
* Audit: only set group mask when something is being watchedEric Paris2010-07-281-2/+9
| | | | | | | | | Currently the audit watch group always sets a mask equal to all events it might care about. We instead should only set the group mask if we are actually watching inodes. This should be a perf win when audit watches are compiled in. Signed-off-by: Eric Paris <eparis@redhat.com>
* fsnotify: fsnotify_obtain_group should be fsnotify_alloc_groupEric Paris2010-07-281-2/+2
| | | | | | | | fsnotify_obtain_group was intended to be able to find an already existing group. Nothing uses that functionality. This just renames it to fsnotify_alloc_group so it is clear what it is doing. Signed-off-by: Eric Paris <eparis@redhat.com>
* fsnotify: remove group_num altogetherEric Paris2010-07-281-1/+1
| | | | | | | | The original fsnotify interface has a group-num which was intended to be able to find a group after it was added. I no longer think this is a necessary thing to do and so we remove the group_num. Signed-off-by: Eric Paris <eparis@redhat.com>
* fsnotify: include data in should_send callsEric Paris2010-07-281-1/+1
| | | | | | | | | fanotify is going to need to look at file->private_data to know if an event should be sent or not. This passes the data (which might be a file, dentry, inode, or none) to the should_send function calls so fanotify can get that information when available Signed-off-by: Eric Paris <eparis@redhat.com>
* fsnotify: provide the data type to should_send_eventEric Paris2010-07-281-1/+2
| | | | | | | | | | fanotify is only interested in event types which contain enough information to open the original file in the context of the fanotify listener. Since fanotify may not want to send events if that data isn't present we pass the data type to the should_send_event function call so fanotify can express its lack of interest. Signed-off-by: Eric Paris <eparis@redhat.com>
* Audit: audit watch init should not be before fsnotify initEric Paris2010-07-281-1/+1
| | | | | | | | | | | | Audit watch init and fsnotify init both use subsys_initcall() but since the audit watch code is linked in before the fsnotify code the audit watch code would be using the fsnotify srcu struct before it was initialized. This patch fixes that problem by moving audit watch init to device_initcall() so it happens after fsnotify is ready. Reported-by: Stephen Rothwell <sfr@canb.auug.org.au> Signed-off-by: Eric Paris <eparis@redhat.com> Tested-by : Sachin Sant <sachinp@in.ibm.com>
* fsnotify: allow addition of duplicate fsnotify marksEric Paris2010-07-281-1/+1
| | | | | | | | | This patch allows a task to add a second fsnotify mark to an inode for the same group. This mark will be added to the end of the inode's list and this will never be found by the stand fsnotify_find_mark() function. This is useful if a user wants to add a new mark before removing the old one. Signed-off-by: Eric Paris <eparis@redhat.com>
* audit: do not get and put just to free a watchEric Paris2010-07-281-24/+3
| | | | | | | | | | deleting audit watch rules is not currently done under audit_filter_mutex. It was done this way because we could not hold the mutex during inotify manipulation. Since we are using fsnotify we don't need to do the extra get/put pair nor do we need the private list on which to store the parents while they are about to be freed. Signed-off-by: Eric Paris <eparis@redhat.com>
* audit: redo audit watch locking and refcnt in light of fsnotifyEric Paris2010-07-281-40/+5
| | | | | | | | fsnotify can handle mutexes to be held across all fsnotify operations since it deals strickly in spinlocks. This can simplify and reduce some of the audit_filter_mutex taking and dropping. Signed-off-by: Eric Paris <eparis@redhat.com>
* audit: convert audit watches to use fsnotify instead of inotifyEric Paris2010-07-281-60/+148
| | | | | | | | Audit currently uses inotify to pin inodes in core and to detect when watched inodes are deleted or unmounted. This patch uses fsnotify instead of inotify. Signed-off-by: Eric Paris <eparis@redhat.com>
* Audit: clean up the audit_watch splitEric Paris2010-07-281-28/+39
| | | | | | | | No real changes, just cleanup to the audit_watch split patch which we done with minimal code changes for easy review. Now fix interfaces to make things work better. Signed-off-by: Eric Paris <eparis@redhat.com>
* include cleanup: Update gfp.h and slab.h includes to prepare for breaking ↵Tejun Heo2010-03-301-0/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | implicit slab.h inclusion from percpu.h percpu.h is included by sched.h and module.h and thus ends up being included when building most .c files. percpu.h includes slab.h which in turn includes gfp.h making everything defined by the two files universally available and complicating inclusion dependencies. percpu.h -> slab.h dependency is about to be removed. Prepare for this change by updating users of gfp and slab facilities include those headers directly instead of assuming availability. As this conversion needs to touch large number of source files, the following script is used as the basis of conversion. http://userweb.kernel.org/~tj/misc/slabh-sweep.py The script does the followings. * Scan files for gfp and slab usages and update includes such that only the necessary includes are there. ie. if only gfp is used, gfp.h, if slab is used, slab.h. * When the script inserts a new include, it looks at the include blocks and try to put the new include such that its order conforms to its surrounding. It's put in the include block which contains core kernel includes, in the same order that the rest are ordered - alphabetical, Christmas tree, rev-Xmas-tree or at the end if there doesn't seem to be any matching order. * If the script can't find a place to put a new include (mostly because the file doesn't have fitting include block), it prints out an error message indicating which .h file needs to be added to the file. The conversion was done in the following steps. 1. The initial automatic conversion of all .c files updated slightly over 4000 files, deleting around 700 includes and adding ~480 gfp.h and ~3000 slab.h inclusions. The script emitted errors for ~400 files. 2. Each error was manually checked. Some didn't need the inclusion, some needed manual addition while adding it to implementation .h or embedding .c file was more appropriate for others. This step added inclusions to around 150 files. 3. The script was run again and the output was compared to the edits from #2 to make sure no file was left behind. 4. Several build tests were done and a couple of problems were fixed. e.g. lib/decompress_*.c used malloc/free() wrappers around slab APIs requiring slab.h to be added manually. 5. The script was run on all .h files but without automatically editing them as sprinkling gfp.h and slab.h inclusions around .h files could easily lead to inclusion dependency hell. Most gfp.h inclusion directives were ignored as stuff from gfp.h was usually wildly available and often used in preprocessor macros. Each slab.h inclusion directive was examined and added manually as necessary. 6. percpu.h was updated not to include slab.h. 7. Build test were done on the following configurations and failures were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my distributed build env didn't work with gcov compiles) and a few more options had to be turned off depending on archs to make things build (like ipr on powerpc/64 which failed due to missing writeq). * x86 and x86_64 UP and SMP allmodconfig and a custom test config. * powerpc and powerpc64 SMP allmodconfig * sparc and sparc64 SMP allmodconfig * ia64 SMP allmodconfig * s390 SMP allmodconfig * alpha SMP allmodconfig * um on x86_64 SMP allmodconfig 8. percpu.h modifications were reverted so that it could be applied as a separate patch and serve as bisection point. Given the fact that I had only a couple of failures from tests on step 6, I'm fairly confident about the coverage of this conversion patch. If there is a breakage, it's likely to be something in one of the arch headers which should be easily discoverable easily on most builds of the specific arch. Signed-off-by: Tejun Heo <tj@kernel.org> Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
* Audit: reorganize struct audit_watch to save 8 bytesEric Paris2009-09-241-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | pahole showed that struct audit_watch had two holes: struct audit_watch { atomic_t count; /* 0 4 */ /* XXX 4 bytes hole, try to pack */ char * path; /* 8 8 */ dev_t dev; /* 16 4 */ /* XXX 4 bytes hole, try to pack */ long unsigned int ino; /* 24 8 */ struct audit_parent * parent; /* 32 8 */ struct list_head wlist; /* 40 16 */ struct list_head rules; /* 56 16 */ /* --- cacheline 1 boundary (64 bytes) was 8 bytes ago --- */ /* size: 72, cachelines: 2, members: 7 */ /* sum members: 64, holes: 2, sum holes: 8 */ /* last cacheline: 8 bytes */ }; /* definitions: 1 */ by moving dev after count we save 8 bytes, actually improving cacheline usage. There are typically very few of these in the kernel so it won't be a large savings, but it's a good thing no matter what. Signed-off-by: Eric Paris <eparis@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* Audit: clean up all op= output to include string quotingEric Paris2009-06-241-5/+1
| | | | | | | | | | | | | | | | | | A number of places in the audit system we send an op= followed by a string that includes spaces. Somehow this works but it's just wrong. This patch moves all of those that I could find to be quoted. Example: Change From: type=CONFIG_CHANGE msg=audit(1244666690.117:31): auid=0 ses=1 subj=unconfined_u:unconfined_r:auditctl_t:s0-s0:c0.c1023 op=remove rule key="number2" list=4 res=0 Change To: type=CONFIG_CHANGE msg=audit(1244666690.117:31): auid=0 ses=1 subj=unconfined_u:unconfined_r:auditctl_t:s0-s0:c0.c1023 op="remove rule" key="number2" list=4 res=0 Signed-off-by: Eric Paris <eparis@redhat.com>
* Audit: move audit_get_nd completely into audit_watchEric Paris2009-06-231-7/+20
| | | | | | | | audit_get_nd() is only used by audit_watch and could be more cleanly implemented by having the audit watch functions call it when needed rather than making the generic audit rule parsing code deal with those objects. Signed-off-by: Eric Paris <eparis@redhat.com>
* audit: seperate audit inode watches into a subfileEric Paris2009-06-231-0/+534
In preparation for converting audit to use fsnotify instead of inotify we seperate the inode watching code into it's own file. This is similar to how the audit tree watching code is already seperated into audit_tree.c Signed-off-by: Eric Paris <eparis@redhat.com>
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