/* audit_watch.c -- watching inodes * * Copyright 2003-2009 Red Hat, Inc. * Copyright 2005 Hewlett-Packard Development Company, L.P. * Copyright 2005 IBM Corporation * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ #include <linux/kernel.h>#include <linux/audit.h>#include <linux/kthread.h>#include <linux/mutex.h>#include <linux/fs.h>#include <linux/fsnotify_backend.h>#include <linux/namei.h>#include <linux/netlink.h>#include <linux/sched.h>#include <linux/slab.h>#include <linux/security.h>#include "audit.h" /* * Reference counting: * * audit_parent: lifetime is from audit_init_parent() to receipt of an FS_IGNORED * event. Each audit_watch holds a reference to its associated parent. * * audit_watch: if added to lists, lifetime is from audit_init_watch() to * audit_remove_watch(). Additionally, an audit_watch may exist * temporarily to assist in searching existing filter data. Each * audit_krule holds a reference to its associated watch. */ struct audit_watch { atomic_t count; /* reference count */ dev_t dev; /* associated superblock device */ char *path; /* insertion path */ unsigned long ino; /* associated inode number */ struct audit_parent *parent; /* associated parent */ struct list_head wlist; /* entry in parent->watches list */ struct list_head rules; /* anchor for krule->rlist */}; struct audit_parent { struct list_head watches; /* anchor for audit_watch->wlist */ struct fsnotify_mark mark; /* fsnotify mark on the inode */}; /* fsnotify handle. */static struct fsnotify_group *audit_watch_group; /* fsnotify events we care about. */#define AUDIT_FS_WATCH (FS_MOVE | FS_CREATE | FS_DELETE | FS_DELETE_SELF |\ FS_MOVE_SELF | FS_EVENT_ON_CHILD) static void audit_free_parent(struct audit_parent *parent){ WARN_ON(!list_empty(&parent->watches)); kfree(parent);} static void audit_watch_free_mark(struct fsnotify_mark *entry){ struct audit_parent *parent; parent = container_of(entry, struct audit_parent, mark); audit_free_parent(parent);} static void audit_get_parent(struct audit_parent *parent){ if (likely(parent)) fsnotify_get_mark(&parent->mark);} static void audit_put_parent(struct audit_parent *parent){ if (likely(parent)) fsnotify_put_mark(&parent->mark);} /* * Find and return the audit_parent on the given inode. If found a reference * is taken on this parent. */static inline struct audit_parent *audit_find_parent(struct inode *inode){ struct audit_parent *parent = NULL; struct fsnotify_mark *entry; entry = fsnotify_find_inode_mark(audit_watch_group, inode); if (entry) parent = container_of(entry, struct audit_parent, mark); return parent;} void audit_get_watch(struct audit_watch *watch){ atomic_inc(&watch->count);} void audit_put_watch(struct audit_watch *watch){ if (atomic_dec_and_test(&watch->count)) { WARN_ON(watch->parent); WARN_ON(!list_empty(&watch->rules)); kfree(watch->path); kfree(watch); }} static void audit_remove_watch(struct audit_watch *watch){ list_del(&watch->wlist); audit_put_parent(watch->parent); watch->parent = NULL; audit_put_watch(watch); /* match initial get */} char *audit_watch_path(struct audit_watch *watch){ return watch->path;} int audit_watch_compare(struct audit_watch *watch, unsigned long ino, dev_t dev){ return (watch->ino != AUDIT_INO_UNSET) && (watch->ino == ino) && (watch->dev == dev);} /* Initialize a parent watch entry. */static struct audit_parent *audit_init_parent(struct path *path){ struct inode *inode = d_backing_inode(path->dentry); struct audit_parent *parent; int ret; parent = kzalloc(sizeof(*parent), GFP_KERNEL); if (unlikely(!parent)) return ERR_PTR(-ENOMEM); INIT_LIST_HEAD(&parent->watches); fsnotify_init_mark(&parent->mark, audit_watch_free_mark); parent->mark.mask = AUDIT_FS_WATCH; ret = fsnotify_add_mark(&parent->mark, audit_watch_group, inode, NULL, 0); if (ret < 0) { audit_free_parent(parent); return ERR_PTR(ret); } return parent;} /* Initialize a watch entry. */static struct audit_watch *audit_init_watch(char *path){ struct audit_watch *watch; watch = kzalloc(sizeof(*watch), GFP_KERNEL); if (unlikely(!watch)) return ERR_PTR(-ENOMEM); INIT_LIST_HEAD(&watch->rules); atomic_set(&watch->count, 1); watch->path = path; watch->dev = AUDIT_DEV_UNSET; watch->ino = AUDIT_INO_UNSET; return watch;} /* Translate a watch string to kernel representation. */int audit_to_watch(struct audit_krule *krule, char *path, int len, u32 op){ struct audit_watch *watch; if (!audit_watch_group) return -EOPNOTSUPP; if (path[0] != '/' || path[len-1] == '/' || krule->listnr != AUDIT_FILTER_EXIT || op != Audit_equal || krule->inode_f || krule->watch || krule->tree) return -EINVAL; watch = audit_init_watch(path); if (IS_ERR(watch)) return PTR_ERR(watch); krule->watch = watch; return 0;} /* Duplicate the given audit watch. The new watch's rules list is initialized * to an empty list and wlist is undefined. */static struct audit_watch *audit_dupe_watch(struct audit_watch *old){ char *path; struct audit_watch *new; path = kstrdup(old->path, GFP_KERNEL); if (unlikely(!path)) return ERR_PTR(-ENOMEM); new = audit_init_watch(path); if (IS_ERR(new)) { kfree(path); goto out; } new->dev = old->dev; new->ino = old->ino; audit_get_parent(old->parent); new->parent = old->parent; out: return new;} static void audit_watch_log_rule_change(struct audit_krule *r, struct audit_watch *w, char *op){ if (audit_enabled) { struct audit_buffer *ab; ab = audit_log_start(NULL, GFP_NOFS, AUDIT_CONFIG_CHANGE); if (unlikely(!ab)) return; audit_log_format(ab, "auid=%u ses=%u op=", from_kuid(&init_user_ns, audit_get_loginuid(current)), audit_get_sessionid(current)); audit_log_string(ab, op); audit_log_format(ab, " path="); audit_log_untrustedstring(ab, w->path); audit_log_key(ab, r->filterkey); audit_log_format(ab, " list=%d res=1", r->listnr); audit_log_end(ab); }} /* Update inode info in audit rules based on filesystem event. */static void audit_update_watch(struct audit_parent *parent, const char *dname, dev_t dev, unsigned long ino, unsigned invalidating){ struct audit_watch *owatch, *nwatch, *nextw; struct audit_krule *r, *nextr; struct audit_entry *oentry, *nentry; mutex_lock(&audit_filter_mutex); /* Run all of the watches on this parent looking for the one that * matches the given dname */ list_for_each_entry_safe(owatch, nextw, &parent->watches, wlist) { if (audit_compare_dname_path(dname, owatch->path, AUDIT_NAME_FULL)) continue; /* If the update involves invalidating rules, do the inode-based * filtering now, so we don't omit records. */ if (invalidating && !audit_dummy_context()) audit_filter_inodes(current, current->audit_context); /* updating ino will likely change which audit_hash_list we * are on so we need a new watch for the new list */ nwatch = audit_dupe_watch(owatch); if (IS_ERR(nwatch)) { mutex_unlock(&audit_filter_mutex); audit_panic("error updating watch, skipping"); return; } nwatch->dev = dev; nwatch->ino = ino; list_for_each_entry_safe(r, nextr, &owatch->rules, rlist) { oentry = container_of(r, struct audit_entry, rule); list_del(&oentry->rule.rlist); list_del_rcu(&oentry->list); nentry = audit_dupe_rule(&oentry->rule); if (IS_ERR(nentry)) { list_del(&oentry->rule.list); audit_panic("error updating watch, removing"); } else { int h = audit_hash_ino((u32)ino); /* * nentry->rule.watch == oentry->rule.watch so * we must drop that reference and set it to our * new watch. */ audit_put_watch(nentry->rule.watch); audit_get_watch(nwatch); nentry->rule.watch = nwatch; list_add(&nentry->rule.rlist, &nwatch->rules); list_add_rcu(&nentry->list, &audit_inode_hash[h]); list_replace(&oentry->rule.list, &nentry->rule.list); } if (oentry->rule.exe) audit_remove_mark(oentry->rule.exe); audit_watch_log_rule_change(r, owatch, "updated_rules"); call_rcu(&oentry->rcu, audit_free_rule_rcu); } audit_remove_watch(owatch); goto add_watch_to_parent; /* event applies to a single watch */ } mutex_unlock(&audit_filter_mutex); return; add_watch_to_parent: list_add(&nwatch->wlist, &parent->watches); mutex_unlock(&audit_filter_mutex); return;} /* Remove all watches & rules associated with a parent that is going away. */static void audit_remove_parent_watches(struct audit_parent *parent){ struct audit_watch *w, *nextw; struct audit_krule *r, *nextr; struct audit_entry *e; mutex_lock(&audit_filter_mutex); list_for_each_entry_safe(w, nextw, &parent->watches, wlist) { list_for_each_entry_safe(r, nextr, &w->rules, rlist) { e = container_of(r, struct audit_entry, rule); audit_watch_log_rule_change(r, w, "remove_rule"); if (e->rule.exe) audit_remove_mark(e->rule.exe); list_del(&r->rlist); list_del(&r->list); list_del_rcu(&e->list); call_rcu(&e->rcu, audit_free_rule_rcu); } audit_remove_watch(w); } mutex_unlock(&audit_filter_mutex); fsnotify_destroy_mark(&parent->mark, audit_watch_group);} /* Get path information necessary for adding watches. */static int audit_get_nd(struct audit_watch *watch, struct path *parent){ struct dentry *d = kern_path_locked(watch->path, parent); if (IS_ERR(d)) return PTR_ERR(d); inode_unlock(d_backing_inode(parent->dentry)); if (d_is_positive(d)) { /* update watch filter fields */ watch->dev = d_backing_inode(d)->i_sb->s_dev; watch->ino = d_backing_inode(d)->i_ino; } dput(d); return 0;} /* Associate the given rule with an existing parent. * Caller must hold audit_filter_mutex. */static void audit_add_to_parent(struct audit_krule *krule, struct audit_parent *parent){ struct audit_watch *w, *watch = krule->watch; int watch_found = 0; BUG_ON(!mutex_is_locked(&audit_filter_mutex)); list_for_each_entry(w, &parent->watches, wlist) { if (strcmp(watch->path, w->path)) continue; watch_found = 1; /* put krule's ref to temporary watch */ audit_put_watch(watch); audit_get_watch(w); krule->watch = watch = w; audit_put_parent(parent); break; } if (!watch_found) { watch->parent = parent; audit_get_watch(watch); list_add(&watch->wlist, &parent->watches); } list_add(&krule->rlist, &watch->rules);} /* Find a matching watch entry, or add this one. * Caller must hold audit_filter_mutex. */int audit_add_watch(struct audit_krule *krule, struct list_head **list){ struct audit_watch *watch = krule->watch; struct audit_parent *parent; struct path parent_path; int h, ret = 0; mutex_unlock(&audit_filter_mutex); /* Avoid calling path_lookup under audit_filter_mutex. */ ret = audit_get_nd(watch, &parent_path); /* caller expects mutex locked */ mutex_lock(&audit_filter_mutex); if (ret) return ret; /* either find an old parent or attach a new one */ parent = audit_find_parent(d_backing_inode(parent_path.dentry)); if (!parent) { parent = audit_init_parent(&parent_path); if (IS_ERR(parent)) { ret = PTR_ERR(parent); goto error; } } audit_add_to_parent(krule, parent); h = audit_hash_ino((u32)watch->ino); *list = &audit_inode_hash[h];error: path_put(&parent_path); return ret;} void audit_remove_watch_rule(struct audit_krule *krule){ struct audit_watch *watch = krule->watch; struct audit_parent *parent = watch->parent; list_del(&krule->rlist); if (list_empty(&watch->rules)) { audit_remove_watch(watch); if (list_empty(&parent->watches)) { audit_get_parent(parent); fsnotify_destroy_mark(&parent->mark, audit_watch_group); audit_put_parent(parent); } }} /* Update watch data in audit rules based on fsnotify events. */static int audit_watch_handle_event(struct fsnotify_group *group, struct inode *to_tell, struct fsnotify_mark *inode_mark, struct fsnotify_mark *vfsmount_mark, u32 mask, void *data, int data_type, const unsigned char *dname, u32 cookie){ struct inode *inode; struct audit_parent *parent; parent = container_of(inode_mark, struct audit_parent, mark); BUG_ON(group != audit_watch_group); switch (data_type) { case (FSNOTIFY_EVENT_PATH): inode = d_backing_inode(((struct path *)data)->dentry); break; case (FSNOTIFY_EVENT_INODE): inode = (struct inode *)data; break; default: BUG(); inode = NULL; break; }; if (mask & (FS_CREATE|FS_MOVED_TO) && inode) audit_update_watch(parent, dname, inode->i_sb->s_dev, inode->i_ino, 0); else if (mask & (FS_DELETE|FS_MOVED_FROM)) audit_update_watch(parent, dname, AUDIT_DEV_UNSET, AUDIT_INO_UNSET, 1);Lines 1–500 of 553. 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/* audit_watch.c -- watching inodes * * Copyright 2003-2009 Red Hat, Inc. * Copyright 2005 Hewlett-Packard Development Company, L.P. * Copyright 2005 IBM Corporation * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ #include <linux/kernel.h> #include <linux/audit.h> #include <linux/kthread.h> #include <linux/mutex.h> #include <linux/fs.h> #include <linux/fsnotify_backend.h> #include <linux/namei.h> #include <linux/netlink.h> #include <linux/sched.h> #include <linux/slab.h> #include <linux/security.h> #include "audit.h" /* * Reference counting: * * audit_parent: lifetime is from audit_init_parent() to receipt of an FS_IGNORED * event. Each audit_watch holds a reference to its associated parent. * * audit_watch: if added to lists, lifetime is from audit_init_watch() to * audit_remove_watch(). Additionally, an audit_watch may exist * temporarily to assist in searching existing filter data. Each * audit_krule holds a reference to its associated watch. */ struct audit_watch { atomic_t count; /* reference count */ dev_t dev; /* associated superblock device */ char *path; /* insertion path */ unsigned long ino; /* associated inode number */ struct audit_parent *parent; /* associated parent */ struct list_head wlist; /* entry in parent->watches list */ struct list_head rules; /* anchor for krule->rlist */ }; struct audit_parent { struct list_head watches; /* anchor for audit_watch->wlist */ struct fsnotify_mark mark; /* fsnotify mark on the inode */ }; /* fsnotify handle. */ static struct fsnotify_group *audit_watch_group; /* fsnotify events we care about. */ #define AUDIT_FS_WATCH (FS_MOVE | FS_CREATE | FS_DELETE | FS_DELETE_SELF |\ FS_MOVE_SELF | FS_EVENT_ON_CHILD) static void audit_free_parent(struct audit_parent *parent) { WARN_ON(!list_empty(&parent->watches)); kfree(parent); } static void audit_watch_free_mark(struct fsnotify_mark *entry) { struct audit_parent *parent; parent = container_of(entry, struct audit_parent, mark); audit_free_parent(parent); } static void audit_get_parent(struct audit_parent *parent) { if (likely(parent)) fsnotify_get_mark(&parent->mark); } static void audit_put_parent(struct audit_parent *parent) { if (likely(parent)) fsnotify_put_mark(&parent->mark); } /* * Find and return the audit_parent on the given inode. If found a reference * is taken on this parent. */ static inline struct audit_parent *audit_find_parent(struct inode *inode) { struct audit_parent *parent = NULL; struct fsnotify_mark *entry; entry = fsnotify_find_inode_mark(audit_watch_group, inode); if (entry) parent = container_of(entry, struct audit_parent, mark); return parent; } void audit_get_watch(struct audit_watch *watch) { atomic_inc(&watch->count); } void audit_put_watch(struct audit_watch *watch) { if (atomic_dec_and_test(&watch->count)) { WARN_ON(watch->parent); WARN_ON(!list_empty(&watch->rules)); kfree(watch->path); kfree(watch); } } static void audit_remove_watch(struct audit_watch *watch) { list_del(&watch->wlist); audit_put_parent(watch->parent); watch->parent = NULL; audit_put_watch(watch); /* match initial get */ } char *audit_watch_path(struct audit_watch *watch) { return watch->path; } int audit_watch_compare(struct audit_watch *watch, unsigned long ino, dev_t dev) { return (watch->ino != AUDIT_INO_UNSET) && (watch->ino == ino) && (watch->dev == dev); } /* Initialize a parent watch entry. */ static struct audit_parent *audit_init_parent(struct path *path) { struct inode *inode = d_backing_inode(path->dentry); struct audit_parent *parent; int ret; parent = kzalloc(sizeof(*parent), GFP_KERNEL); if (unlikely(!parent)) return ERR_PTR(-ENOMEM); INIT_LIST_HEAD(&parent->watches); fsnotify_init_mark(&parent->mark, audit_watch_free_mark); parent->mark.mask = AUDIT_FS_WATCH; ret = fsnotify_add_mark(&parent->mark, audit_watch_group, inode, NULL, 0); if (ret < 0) { audit_free_parent(parent); return ERR_PTR(ret); } return parent; } /* Initialize a watch entry. */ static struct audit_watch *audit_init_watch(char *path) { struct audit_watch *watch; watch = kzalloc(sizeof(*watch), GFP_KERNEL); if (unlikely(!watch)) return ERR_PTR(-ENOMEM); INIT_LIST_HEAD(&watch->rules); atomic_set(&watch->count, 1); watch->path = path; watch->dev = AUDIT_DEV_UNSET; watch->ino = AUDIT_INO_UNSET; return watch; } /* Translate a watch string to kernel representation. */ int audit_to_watch(struct audit_krule *krule, char *path, int len, u32 op) { struct audit_watch *watch; if (!audit_watch_group) return -EOPNOTSUPP; if (path[0] != '/' || path[len-1] == '/' || krule->listnr != AUDIT_FILTER_EXIT || op != Audit_equal || krule->inode_f || krule->watch || krule->tree) return -EINVAL; watch = audit_init_watch(path); if (IS_ERR(watch)) return PTR_ERR(watch); krule->watch = watch; return 0; } /* Duplicate the given audit watch. The new watch's rules list is initialized * to an empty list and wlist is undefined. */ static struct audit_watch *audit_dupe_watch(struct audit_watch *old) { char *path; struct audit_watch *new; path = kstrdup(old->path, GFP_KERNEL); if (unlikely(!path)) return ERR_PTR(-ENOMEM); new = audit_init_watch(path); if (IS_ERR(new)) { kfree(path); goto out; } new->dev = old->dev; new->ino = old->ino; audit_get_parent(old->parent); new->parent = old->parent; out: return new; } static void audit_watch_log_rule_change(struct audit_krule *r, struct audit_watch *w, char *op) { if (audit_enabled) { struct audit_buffer *ab; ab = audit_log_start(NULL, GFP_NOFS, AUDIT_CONFIG_CHANGE); if (unlikely(!ab)) return; audit_log_format(ab, "auid=%u ses=%u op=", from_kuid(&init_user_ns, audit_get_loginuid(current)), audit_get_sessionid(current)); audit_log_string(ab, op); audit_log_format(ab, " path="); audit_log_untrustedstring(ab, w->path); audit_log_key(ab, r->filterkey); audit_log_format(ab, " list=%d res=1", r->listnr); audit_log_end(ab); } } /* Update inode info in audit rules based on filesystem event. */ static void audit_update_watch(struct audit_parent *parent, const char *dname, dev_t dev, unsigned long ino, unsigned invalidating) { struct audit_watch *owatch, *nwatch, *nextw; struct audit_krule *r, *nextr; struct audit_entry *oentry, *nentry; mutex_lock(&audit_filter_mutex); /* Run all of the watches on this parent looking for the one that * matches the given dname */ list_for_each_entry_safe(owatch, nextw, &parent->watches, wlist) { if (audit_compare_dname_path(dname, owatch->path, AUDIT_NAME_FULL)) continue; /* If the update involves invalidating rules, do the inode-based * filtering now, so we don't omit records. */ if (invalidating && !audit_dummy_context()) audit_filter_inodes(current, current->audit_context); /* updating ino will likely change which audit_hash_list we * are on so we need a new watch for the new list */ nwatch = audit_dupe_watch(owatch); if (IS_ERR(nwatch)) { mutex_unlock(&audit_filter_mutex); audit_panic("error updating watch, skipping"); return; } nwatch->dev = dev; nwatch->ino = ino; list_for_each_entry_safe(r, nextr, &owatch->rules, rlist) { oentry = container_of(r, struct audit_entry, rule); list_del(&oentry->rule.rlist); list_del_rcu(&oentry->list); nentry = audit_dupe_rule(&oentry->rule); if (IS_ERR(nentry)) { list_del(&oentry->rule.list); audit_panic("error updating watch, removing"); } else { int h = audit_hash_ino((u32)ino); /* * nentry->rule.watch == oentry->rule.watch so * we must drop that reference and set it to our * new watch. */ audit_put_watch(nentry->rule.watch); audit_get_watch(nwatch); nentry->rule.watch = nwatch; list_add(&nentry->rule.rlist, &nwatch->rules); list_add_rcu(&nentry->list, &audit_inode_hash[h]); list_replace(&oentry->rule.list, &nentry->rule.list); } if (oentry->rule.exe) audit_remove_mark(oentry->rule.exe); audit_watch_log_rule_change(r, owatch, "updated_rules"); call_rcu(&oentry->rcu, audit_free_rule_rcu); } audit_remove_watch(owatch); goto add_watch_to_parent; /* event applies to a single watch */ } mutex_unlock(&audit_filter_mutex); return; add_watch_to_parent: list_add(&nwatch->wlist, &parent->watches); mutex_unlock(&audit_filter_mutex); return; } /* Remove all watches & rules associated with a parent that is going away. */ static void audit_remove_parent_watches(struct audit_parent *parent) { struct audit_watch *w, *nextw; struct audit_krule *r, *nextr; struct audit_entry *e; mutex_lock(&audit_filter_mutex); list_for_each_entry_safe(w, nextw, &parent->watches, wlist) { list_for_each_entry_safe(r, nextr, &w->rules, rlist) { e = container_of(r, struct audit_entry, rule); audit_watch_log_rule_change(r, w, "remove_rule"); if (e->rule.exe) audit_remove_mark(e->rule.exe); list_del(&r->rlist); list_del(&r->list); list_del_rcu(&e->list); call_rcu(&e->rcu, audit_free_rule_rcu); } audit_remove_watch(w); } mutex_unlock(&audit_filter_mutex); fsnotify_destroy_mark(&parent->mark, audit_watch_group); } /* Get path information necessary for adding watches. */ static int audit_get_nd(struct audit_watch *watch, struct path *parent) { struct dentry *d = kern_path_locked(watch->path, parent); if (IS_ERR(d)) return PTR_ERR(d); inode_unlock(d_backing_inode(parent->dentry)); if (d_is_positive(d)) { /* update watch filter fields */ watch->dev = d_backing_inode(d)->i_sb->s_dev; watch->ino = d_backing_inode(d)->i_ino; } dput(d); return 0; } /* Associate the given rule with an existing parent. * Caller must hold audit_filter_mutex. */ static void audit_add_to_parent(struct audit_krule *krule, struct audit_parent *parent) { struct audit_watch *w, *watch = krule->watch; int watch_found = 0; BUG_ON(!mutex_is_locked(&audit_filter_mutex)); list_for_each_entry(w, &parent->watches, wlist) { if (strcmp(watch->path, w->path)) continue; watch_found = 1; /* put krule's ref to temporary watch */ audit_put_watch(watch); audit_get_watch(w); krule->watch = watch = w; audit_put_parent(parent); break; } if (!watch_found) { watch->parent = parent; audit_get_watch(watch); list_add(&watch->wlist, &parent->watches); } list_add(&krule->rlist, &watch->rules); } /* Find a matching watch entry, or add this one. * Caller must hold audit_filter_mutex. */ int audit_add_watch(struct audit_krule *krule, struct list_head **list) { struct audit_watch *watch = krule->watch; struct audit_parent *parent; struct path parent_path; int h, ret = 0; mutex_unlock(&audit_filter_mutex); /* Avoid calling path_lookup under audit_filter_mutex. */ ret = audit_get_nd(watch, &parent_path); /* caller expects mutex locked */ mutex_lock(&audit_filter_mutex); if (ret) return ret; /* either find an old parent or attach a new one */ parent = audit_find_parent(d_backing_inode(parent_path.dentry)); if (!parent) { parent = audit_init_parent(&parent_path); if (IS_ERR(parent)) { ret = PTR_ERR(parent); goto error; } } audit_add_to_parent(krule, parent); h = audit_hash_ino((u32)watch->ino); *list = &audit_inode_hash[h]; error: path_put(&parent_path); return ret; } void audit_remove_watch_rule(struct audit_krule *krule) { struct audit_watch *watch = krule->watch; struct audit_parent *parent = watch->parent; list_del(&krule->rlist); if (list_empty(&watch->rules)) { audit_remove_watch(watch); if (list_empty(&parent->watches)) { audit_get_parent(parent); fsnotify_destroy_mark(&parent->mark, audit_watch_group); audit_put_parent(parent); } } } /* Update watch data in audit rules based on fsnotify events. */ static int audit_watch_handle_event(struct fsnotify_group *group, struct inode *to_tell, struct fsnotify_mark *inode_mark, struct fsnotify_mark *vfsmount_mark, u32 mask, void *data, int data_type, const unsigned char *dname, u32 cookie) { struct inode *inode; struct audit_parent *parent; parent = container_of(inode_mark, struct audit_parent, mark); BUG_ON(group != audit_watch_group); switch (data_type) { case (FSNOTIFY_EVENT_PATH): inode = d_backing_inode(((struct path *)data)->dentry); break; case (FSNOTIFY_EVENT_INODE): inode = (struct inode *)data; break; default: BUG(); inode = NULL; break; }; if (mask & (FS_CREATE|FS_MOVED_TO) && inode) audit_update_watch(parent, dname, inode->i_sb->s_dev, inode->i_ino, 0); else if (mask & (FS_DELETE|FS_MOVED_FROM)) audit_update_watch(parent, dname, AUDIT_DEV_UNSET, AUDIT_INO_UNSET, 1);