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2016-04-11don't bother with ->d_inode->i_sb - it's always equal to ->d_sbAl Viro1-1/+1
... and neither can ever be NULL Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2016-03-20Merge branch 'stable-4.6' of git://git.infradead.org/users/pcmoore/auditLinus Torvalds1-1/+1
Pull audit updates from Paul Moore: "A small set of patches for audit this time; just three in total and one is a spelling fix. The two patches with actual content are designed to help prevent new instances of auditd from displacing an existing, functioning auditd and to generate a log of the attempt. Not to worry, dead/stuck auditd instances can still be replaced by a new instance without problem. Nothing controversial, and everything passes our regression suite" * 'stable-4.6' of git://git.infradead.org/users/pcmoore/audit: audit: Fix typo in comment audit: log failed attempts to change audit_pid configuration audit: stop an old auditd being starved out by a new auditd
2016-02-08audit: Fix typo in commentWei Yuan1-1/+1
Signed-off-by: Weiyuan <weiyuan.wei@huawei.com> Signed-off-by: Paul Moore <paul@paul-moore.com>
2016-01-23wrappers for ->i_mutex accessAl Viro1-1/+1
parallel to mutex_{lock,unlock,trylock,is_locked,lock_nested}, inode_foo(inode) being mutex_foo(&inode->i_mutex). Please, use those for access to ->i_mutex; over the coming cycle ->i_mutex will become rwsem, with ->lookup() done with it held only shared. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2015-09-08Merge branch 'upstream' of git://git.infradead.org/users/pcmoore/auditLinus Torvalds1-11/+45
Pull audit update from Paul Moore: "This is one of the larger audit patchsets in recent history, consisting of eight patches and almost 400 lines of changes. The bulk of the patchset is the new "audit by executable" functionality which allows admins to set an audit watch based on the executable on disk. Prior to this, admins could only track an application by PID, which has some obvious limitations. Beyond the new functionality we also have some refcnt fixes and a few minor cleanups" * 'upstream' of git://git.infradead.org/users/pcmoore/audit: fixup: audit: implement audit by executable audit: implement audit by executable audit: clean simple fsnotify implementation audit: use macros for unset inode and device values audit: make audit_del_rule() more robust audit: fix uninitialized variable in audit_add_rule() audit: eliminate unnecessary extra layer of watch parent references audit: eliminate unnecessary extra layer of watch references
2015-08-13fixup: audit: implement audit by executableRichard Guy Briggs1-3/+9
The Intel build-bot detected a sparse warning with with a patch I posted a couple of days ago that was accepted in the audit/next tree: Subject: [linux-next:master 6689/6751] kernel/audit_watch.c:543:36: sparse: dereference of noderef expression Date: Friday, August 07, 2015, 06:57:55 PM From: kbuild test robot <fengguang.wu@intel.com> tree: git://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master head: e6455bc5b91f41f842f30465c9193320f0568707 commit: 2e3a8aeb63e5335d4f837d453787c71bcb479796 [6689/6751] Merge remote- tracking branch 'audit/next' sparse warnings: (new ones prefixed by >>) >> kernel/audit_watch.c:543:36: sparse: dereference of noderef expression kernel/audit_watch.c:544:28: sparse: dereference of noderef expression 34d99af5 Richard Guy Briggs 2015-08-05 541 int audit_exe_compare(struct task_struct *tsk, struct audit_fsnotify_mark *mark) 34d99af5 Richard Guy Briggs 2015-08-05 542 { 34d99af5 Richard Guy Briggs 2015-08-05 @543 unsigned long ino = tsk->mm- >exe_file->f_inode->i_ino; 34d99af5 Richard Guy Briggs 2015-08-05 544 dev_t dev = tsk->mm->exe_file- >f_inode->i_sb->s_dev; :::::: The code at line 543 was first introduced by commit :::::: 34d99af52ad40bd498ba66970579a5bc1fb1a3bc audit: implement audit by executable tsk->mm->exe_file requires RCU access. The warning was reproduceable by adding "C=1 CF=-D__CHECK_ENDIAN__" to the build command, and verified eliminated with this patch. Signed-off-by: Richard Guy Briggs <rgb@redhat.com> Signed-off-by: Paul Moore <pmoore@redhat.com>
2015-08-06audit: implement audit by executableRichard Guy Briggs1-0/+31
This adds the ability audit the actions of a not-yet-running process. This patch implements the ability to filter on the executable path. Instead of just hard coding the ino and dev of the executable we care about at the moment the rule is inserted into the kernel, use the new audit_fsnotify infrastructure to manage this dynamically. This means that if the filename does not yet exist but the containing directory does, or if the inode in question is unlinked and creat'd (aka updated) the rule will just continue to work. If the containing directory is moved or deleted or the filesystem is unmounted, the rule is deleted automatically. A future enhancement would be to have the rule survive across directory disruptions. This is a heavily modified version of a patch originally submitted by Eric Paris with some ideas from Peter Moody. Cc: Peter Moody <peter@hda3.com> Cc: Eric Paris <eparis@redhat.com> Signed-off-by: Richard Guy Briggs <rgb@redhat.com> [PM: minor whitespace clean to satisfy ./scripts/checkpatch] Signed-off-by: Paul Moore <pmoore@redhat.com>
2015-08-06audit: use macros for unset inode and device valuesRichard Guy Briggs1-4/+4
Clean up a number of places were casted magic numbers are used to represent unset inode and device numbers in preparation for the audit by executable path patch set. Signed-off-by: Richard Guy Briggs <rgb@redhat.com> [PM: enclosed the _UNSET macros in parentheses for ./scripts/checkpatch] Signed-off-by: Paul Moore <pmoore@redhat.com>
2015-08-05audit: eliminate unnecessary extra layer of watch parent referencesRichard Guy Briggs1-4/+2
The audit watch parent count was imbalanced, adding an unnecessary layer of watch parent references. Decrement the additional parent reference when a watch is reused, already having a reference to the parent. audit_find_parent() gets a reference to the parent, if the parent is already known. This additional parental reference is not needed if the watch is subsequently found by audit_add_to_parent(), and consumed if the watch does not already exist, so we need to put the parent if the watch is found, and do nothing if this new watch is added to the parent. If the parent wasn't already known, it is created with a refcount of 1 and added to the audit_watch_group, then incremented by one to be subsequently consumed by the newly created watch in audit_add_to_parent(). The rule points to the watch, not to the parent, so the rule's refcount gets bumped, not the parent's. See LKML, 2015-07-16 Signed-off-by: Richard Guy Briggs <rgb@redhat.com> Signed-off-by: Paul Moore <pmoore@redhat.com>
2015-08-05audit: eliminate unnecessary extra layer of watch referencesRichard Guy Briggs1-3/+2
The audit watch count was imbalanced, adding an unnecessary layer of watch references. Only add the second reference when it is added to a parent. Signed-off-by: Richard Guy Briggs <rgb@redhat.com> Signed-off-by: Paul Moore <pmoore@redhat.com>
2015-04-15VFS: audit: d_backing_inode() annotationsDavid Howells1-7/+7
Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2014-09-24audit: invalid op= values for rulesBurn Alting1-2/+2
Various audit events dealing with adding, removing and updating rules result in invalid values set for the op keys which result in embedded spaces in op= values. The invalid values are op="add rule" set in kernel/auditfilter.c op="remove rule" set in kernel/auditfilter.c op="remove rule" set in kernel/audit_tree.c op="updated rules" set in kernel/audit_watch.c op="remove rule" set in kernel/audit_watch.c Replace the space in the above values with an underscore character ('_'). Coded-by: Burn Alting <burn@swtf.dyndns.org> Signed-off-by: Richard Guy Briggs <rgb@redhat.com>
2014-02-18inotify: Fix reporting of cookies for inotify eventsJan Kara1-1/+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>
2014-01-22fsnotify: remove pointless NULL initializersJan Kara1-3/+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>
2014-01-22fsnotify: remove .should_send_event callbackJan Kara1-9/+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>
2014-01-22fsnotify: do not share events between notification groupsJan Kara1-7/+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>
2013-01-12audit: catch possible NULL audit buffersKees Cook1-0/+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>
2012-12-21Merge branch 'for-next' of git://git.infradead.org/users/eparis/notifyLinus Torvalds1-2/+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()
2012-12-11fsnotify: pass group to fsnotify_destroy_mark()Lino Sanfilippo1-2/+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>
2012-10-12audit: optimize audit_compare_dname_pathJeff Layton1-1/+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>
2012-10-12audit: remove dirlen argument to audit_compare_dname_pathJeff Layton1-1/+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>
2012-09-18userns: Convert the audit loginuid to be a kuidEric W. Biederman1-1/+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>
2012-07-14get rid of kern_path_parent()Al Viro1-22/+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>
2011-03-14kill path_lookup()Al Viro1-1/+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>
2011-03-14fix race in audit_get_nd()Al Viro1-53/+32
don't rely on pathname resolution ending up twice at the same point... Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2010-10-30audit: make functions staticStephen Hemminger1-2/+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>
2010-08-13Revert "fsnotify: store struct file not struct path"Linus Torvalds1-2/+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>
2010-07-28fanotify: use both marks when possibleEric Paris1-1/+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>
2010-07-28fsnotify: pass both the vfsmount mark and inode markEric Paris1-3/+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>
2010-07-28fsnotify: remove group->maskEric Paris1-8/+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>
2010-07-28fsnotify: cleanup should_send_eventEric Paris1-6/+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>
2010-07-28audit: use the mark in handler functionsEric Paris1-17/+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>
2010-07-28fsnotify: send fsnotify_mark to groups in event handling functionsEric Paris1-3/+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>
2010-07-28fsnotify: store struct file not struct pathEric Paris1-2/+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>
2010-07-28fsnotify: split generic and inode specific mark codeEric Paris1-3/+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>
2010-07-28fsnotify: take inode->i_lock inside fsnotify_find_mark_entry()Andreas Gruenbacher1-5/+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>
2010-07-28fsnotify: rename fsnotify_find_mark_entry to fsnotify_find_markEric Paris1-4/+4
the _entry portion of fsnotify functions is useless. Drop it. Signed-off-by: Eric Paris <eparis@redhat.com>
2010-07-28fsnotify: rename fsnotify_mark_entry to just fsnotify_markEric Paris1-4/+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>
2010-07-28fsnotify: include vfsmount in should_send_event when appropriateEric Paris1-1/+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>
2010-07-28fsnotify: drop mask argument from fsnotify_alloc_groupEric Paris1-1/+1
Nothing uses the mask argument to fsnotify_alloc_group. This patch drops that argument. Signed-off-by: Eric Paris <eparis@redhat.com>
2010-07-28Audit: only set group mask when something is being watchedEric Paris1-2/+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>
2010-07-28fsnotify: fsnotify_obtain_group should be fsnotify_alloc_groupEric Paris1-2/+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>
2010-07-28fsnotify: remove group_num altogetherEric Paris1-1/+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>
2010-07-28fsnotify: include data in should_send callsEric Paris1-1/+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>
2010-07-28fsnotify: provide the data type to should_send_eventEric Paris1-1/+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>
2010-07-28Audit: audit watch init should not be before fsnotify initEric Paris1-1/+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>
2010-07-28fsnotify: allow addition of duplicate fsnotify marksEric Paris1-1/+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>
2010-07-28audit: do not get and put just to free a watchEric Paris1-24/+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>
2010-07-28audit: redo audit watch locking and refcnt in light of fsnotifyEric Paris1-40/+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>
2010-07-28audit: convert audit watches to use fsnotify instead of inotifyEric Paris1-60/+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>