]> git.openfabrics.org - ~shefty/rdma-dev.git/commitdiff
Merge branch 'audit.b63' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/audit...
authorLinus Torvalds <torvalds@linux-foundation.org>
Wed, 24 Jun 2009 17:22:57 +0000 (10:22 -0700)
committerLinus Torvalds <torvalds@linux-foundation.org>
Wed, 24 Jun 2009 17:22:57 +0000 (10:22 -0700)
* 'audit.b63' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/audit-current:
  Fix rule eviction order for AUDIT_DIR
  Audit: clean up all op= output to include string quoting
  Audit: move audit_get_nd completely into audit_watch
  audit: seperate audit inode watches into a subfile
  Audit: clean up audit_receive_skb
  Audit: cleanup netlink mesg handling
  Audit: unify the printk of an skb when auditd not around
  Audit: dereferencing krule as if it were an audit_watch
  Audit: better estimation of execve record length
  Audit: fix audit watch use after free

include/linux/audit.h
kernel/Makefile
kernel/audit.c
kernel/audit.h
kernel/audit_tree.c
kernel/audit_watch.c [new file with mode: 0644]
kernel/auditfilter.c
kernel/auditsc.c

index 4fa2810b675e6a157293a0aa431e1af95d71d99b..3c7a358241a71d78c9aa288f08b1d83a61a1abb8 100644 (file)
@@ -599,6 +599,8 @@ extern void             audit_log_untrustedstring(struct audit_buffer *ab,
 extern void                audit_log_d_path(struct audit_buffer *ab,
                                             const char *prefix,
                                             struct path *path);
+extern void                audit_log_key(struct audit_buffer *ab,
+                                         char *key);
 extern void                audit_log_lost(const char *message);
 extern int                 audit_update_lsm_rules(void);
 
@@ -621,6 +623,7 @@ extern int audit_enabled;
 #define audit_log_n_untrustedstring(a,n,s) do { ; } while (0)
 #define audit_log_untrustedstring(a,s) do { ; } while (0)
 #define audit_log_d_path(b, p, d) do { ; } while (0)
+#define audit_log_key(b, k) do { ; } while (0)
 #define audit_enabled 0
 #endif
 #endif
index 0a32cb21ec9752fc689020795224280d12eb09a8..da750010a6fc1669c9ce9dfab22f103b2e70b90b 100644 (file)
@@ -70,7 +70,7 @@ obj-$(CONFIG_RESOURCE_COUNTERS) += res_counter.o
 obj-$(CONFIG_STOP_MACHINE) += stop_machine.o
 obj-$(CONFIG_KPROBES_SANITY_TEST) += test_kprobes.o
 obj-$(CONFIG_AUDIT) += audit.o auditfilter.o
-obj-$(CONFIG_AUDITSYSCALL) += auditsc.o
+obj-$(CONFIG_AUDITSYSCALL) += auditsc.o audit_watch.o
 obj-$(CONFIG_GCOV_KERNEL) += gcov/
 obj-$(CONFIG_AUDIT_TREE) += audit_tree.o
 obj-$(CONFIG_KPROBES) += kprobes.o
index 9442c3533ba9f8be398333d8ee7b74882b339ae0..defc2e6f1e3bc9742606d7efc0a0af4e79095b14 100644 (file)
@@ -115,9 +115,6 @@ static atomic_t    audit_lost = ATOMIC_INIT(0);
 /* The netlink socket. */
 static struct sock *audit_sock;
 
-/* Inotify handle. */
-struct inotify_handle *audit_ih;
-
 /* Hash for inode-based rules */
 struct list_head audit_inode_hash[AUDIT_INODE_BUCKETS];
 
@@ -136,7 +133,7 @@ static DECLARE_WAIT_QUEUE_HEAD(kauditd_wait);
 static DECLARE_WAIT_QUEUE_HEAD(audit_backlog_wait);
 
 /* Serialize requests from userspace. */
-static DEFINE_MUTEX(audit_cmd_mutex);
+DEFINE_MUTEX(audit_cmd_mutex);
 
 /* AUDIT_BUFSIZ is the size of the temporary buffer used for formatting
  * audit records.  Since printk uses a 1024 byte buffer, this buffer
@@ -375,6 +372,25 @@ static void audit_hold_skb(struct sk_buff *skb)
                kfree_skb(skb);
 }
 
+/*
+ * For one reason or another this nlh isn't getting delivered to the userspace
+ * audit daemon, just send it to printk.
+ */
+static void audit_printk_skb(struct sk_buff *skb)
+{
+       struct nlmsghdr *nlh = nlmsg_hdr(skb);
+       char *data = NLMSG_DATA(nlh);
+
+       if (nlh->nlmsg_type != AUDIT_EOE) {
+               if (printk_ratelimit())
+                       printk(KERN_NOTICE "type=%d %s\n", nlh->nlmsg_type, data);
+               else
+                       audit_log_lost("printk limit exceeded\n");
+       }
+
+       audit_hold_skb(skb);
+}
+
 static void kauditd_send_skb(struct sk_buff *skb)
 {
        int err;
@@ -427,14 +443,8 @@ static int kauditd_thread(void *dummy)
                if (skb) {
                        if (audit_pid)
                                kauditd_send_skb(skb);
-                       else {
-                               if (printk_ratelimit())
-                                       printk(KERN_NOTICE "%s\n", skb->data + NLMSG_SPACE(0));
-                               else
-                                       audit_log_lost("printk limit exceeded\n");
-
-                               audit_hold_skb(skb);
-                       }
+                       else
+                               audit_printk_skb(skb);
                } else {
                        DECLARE_WAITQUEUE(wait, current);
                        set_current_state(TASK_INTERRUPTIBLE);
@@ -495,42 +505,25 @@ int audit_send_list(void *_dest)
        return 0;
 }
 
-#ifdef CONFIG_AUDIT_TREE
-static int prune_tree_thread(void *unused)
-{
-       mutex_lock(&audit_cmd_mutex);
-       audit_prune_trees();
-       mutex_unlock(&audit_cmd_mutex);
-       return 0;
-}
-
-void audit_schedule_prune(void)
-{
-       kthread_run(prune_tree_thread, NULL, "audit_prune_tree");
-}
-#endif
-
 struct sk_buff *audit_make_reply(int pid, int seq, int type, int done,
                                 int multi, void *payload, int size)
 {
        struct sk_buff  *skb;
        struct nlmsghdr *nlh;
-       int             len = NLMSG_SPACE(size);
        void            *data;
        int             flags = multi ? NLM_F_MULTI : 0;
        int             t     = done  ? NLMSG_DONE  : type;
 
-       skb = alloc_skb(len, GFP_KERNEL);
+       skb = nlmsg_new(size, GFP_KERNEL);
        if (!skb)
                return NULL;
 
-       nlh              = NLMSG_PUT(skb, pid, seq, t, size);
-       nlh->nlmsg_flags = flags;
-       data             = NLMSG_DATA(nlh);
+       nlh     = NLMSG_NEW(skb, pid, seq, t, size, flags);
+       data    = NLMSG_DATA(nlh);
        memcpy(data, payload, size);
        return skb;
 
-nlmsg_failure:                 /* Used by NLMSG_PUT */
+nlmsg_failure:                 /* Used by NLMSG_NEW */
        if (skb)
                kfree_skb(skb);
        return NULL;
@@ -926,28 +919,29 @@ static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
 }
 
 /*
- * Get message from skb (based on rtnetlink_rcv_skb).  Each message is
- * processed by audit_receive_msg.  Malformed skbs with wrong length are
- * discarded silently.
+ * Get message from skb.  Each message is processed by audit_receive_msg.
+ * Malformed skbs with wrong length are discarded silently.
  */
 static void audit_receive_skb(struct sk_buff *skb)
 {
-       int             err;
-       struct nlmsghdr *nlh;
-       u32             rlen;
+       struct nlmsghdr *nlh;
+       /*
+        * len MUST be signed for NLMSG_NEXT to be able to dec it below 0
+        * if the nlmsg_len was not aligned
+        */
+       int len;
+       int err;
 
-       while (skb->len >= NLMSG_SPACE(0)) {
-               nlh = nlmsg_hdr(skb);
-               if (nlh->nlmsg_len < sizeof(*nlh) || skb->len < nlh->nlmsg_len)
-                       return;
-               rlen = NLMSG_ALIGN(nlh->nlmsg_len);
-               if (rlen > skb->len)
-                       rlen = skb->len;
-               if ((err = audit_receive_msg(skb, nlh))) {
+       nlh = nlmsg_hdr(skb);
+       len = skb->len;
+
+       while (NLMSG_OK(nlh, len)) {
+               err = audit_receive_msg(skb, nlh);
+               /* if err or if this message says it wants a response */
+               if (err || (nlh->nlmsg_flags & NLM_F_ACK))
                        netlink_ack(skb, nlh, err);
-               } else if (nlh->nlmsg_flags & NLM_F_ACK)
-                       netlink_ack(skb, nlh, 0);
-               skb_pull(skb, rlen);
+
+               nlh = NLMSG_NEXT(nlh, len);
        }
 }
 
@@ -959,13 +953,6 @@ static void audit_receive(struct sk_buff  *skb)
        mutex_unlock(&audit_cmd_mutex);
 }
 
-#ifdef CONFIG_AUDITSYSCALL
-static const struct inotify_operations audit_inotify_ops = {
-       .handle_event   = audit_handle_ievent,
-       .destroy_watch  = audit_free_parent,
-};
-#endif
-
 /* Initialize audit support at boot time. */
 static int __init audit_init(void)
 {
@@ -991,12 +978,6 @@ static int __init audit_init(void)
 
        audit_log(NULL, GFP_KERNEL, AUDIT_KERNEL, "initialized");
 
-#ifdef CONFIG_AUDITSYSCALL
-       audit_ih = inotify_init(&audit_inotify_ops);
-       if (IS_ERR(audit_ih))
-               audit_panic("cannot initialize inotify handle");
-#endif
-
        for (i = 0; i < AUDIT_INODE_BUCKETS; i++)
                INIT_LIST_HEAD(&audit_inode_hash[i]);
 
@@ -1070,18 +1051,20 @@ static struct audit_buffer * audit_buffer_alloc(struct audit_context *ctx,
                        goto err;
        }
 
-       ab->skb = alloc_skb(AUDIT_BUFSIZ, gfp_mask);
-       if (!ab->skb)
-               goto err;
-
        ab->ctx = ctx;
        ab->gfp_mask = gfp_mask;
-       nlh = (struct nlmsghdr *)skb_put(ab->skb, NLMSG_SPACE(0));
-       nlh->nlmsg_type = type;
-       nlh->nlmsg_flags = 0;
-       nlh->nlmsg_pid = 0;
-       nlh->nlmsg_seq = 0;
+
+       ab->skb = nlmsg_new(AUDIT_BUFSIZ, gfp_mask);
+       if (!ab->skb)
+               goto nlmsg_failure;
+
+       nlh = NLMSG_NEW(ab->skb, 0, 0, type, 0, 0);
+
        return ab;
+
+nlmsg_failure:                  /* Used by NLMSG_NEW */
+       kfree_skb(ab->skb);
+       ab->skb = NULL;
 err:
        audit_buffer_free(ab);
        return NULL;
@@ -1452,6 +1435,15 @@ void audit_log_d_path(struct audit_buffer *ab, const char *prefix,
        kfree(pathname);
 }
 
+void audit_log_key(struct audit_buffer *ab, char *key)
+{
+       audit_log_format(ab, " key=");
+       if (key)
+               audit_log_untrustedstring(ab, key);
+       else
+               audit_log_format(ab, "(null)");
+}
+
 /**
  * audit_log_end - end one audit record
  * @ab: the audit_buffer
@@ -1475,15 +1467,7 @@ void audit_log_end(struct audit_buffer *ab)
                        skb_queue_tail(&audit_skb_queue, ab->skb);
                        wake_up_interruptible(&kauditd_wait);
                } else {
-                       if (nlh->nlmsg_type != AUDIT_EOE) {
-                               if (printk_ratelimit()) {
-                                       printk(KERN_NOTICE "type=%d %s\n",
-                                               nlh->nlmsg_type,
-                                               ab->skb->data + NLMSG_SPACE(0));
-                               } else
-                                       audit_log_lost("printk limit exceeded\n");
-                       }
-                       audit_hold_skb(ab->skb);
+                       audit_printk_skb(ab->skb);
                }
                ab->skb = NULL;
        }
index 16f18cac661b68261c20c551caa3a94333df3da0..208687be4f30c8a2ddb432e3c1b8594fb85d2e8e 100644 (file)
@@ -53,18 +53,7 @@ enum audit_state {
 };
 
 /* Rule lists */
-struct audit_parent;
-
-struct audit_watch {
-       atomic_t                count;  /* reference count */
-       char                    *path;  /* insertion path */
-       dev_t                   dev;    /* associated superblock device */
-       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;  /* associated rules */
-};
-
+struct audit_watch;
 struct audit_tree;
 struct audit_chunk;
 
@@ -108,19 +97,28 @@ struct audit_netlink_list {
 
 int audit_send_list(void *);
 
-struct inotify_watch;
-/* Inotify handle */
-extern struct inotify_handle *audit_ih;
-
-extern void audit_free_parent(struct inotify_watch *);
-extern void audit_handle_ievent(struct inotify_watch *, u32, u32, u32,
-                               const char *, struct inode *);
 extern int selinux_audit_rule_update(void);
 
 extern struct mutex audit_filter_mutex;
 extern void audit_free_rule_rcu(struct rcu_head *);
 extern struct list_head audit_filter_list[];
 
+/* audit watch functions */
+extern unsigned long audit_watch_inode(struct audit_watch *watch);
+extern dev_t audit_watch_dev(struct audit_watch *watch);
+extern void audit_put_watch(struct audit_watch *watch);
+extern void audit_get_watch(struct audit_watch *watch);
+extern int audit_to_watch(struct audit_krule *krule, char *path, int len, u32 op);
+extern int audit_add_watch(struct audit_krule *krule);
+extern void audit_remove_watch(struct audit_watch *watch);
+extern void audit_remove_watch_rule(struct audit_krule *krule, struct list_head *list);
+extern void audit_inotify_unregister(struct list_head *in_list);
+extern char *audit_watch_path(struct audit_watch *watch);
+extern struct list_head *audit_watch_rules(struct audit_watch *watch);
+
+extern struct audit_entry *audit_dupe_rule(struct audit_krule *old,
+                                          struct audit_watch *watch);
+
 #ifdef CONFIG_AUDIT_TREE
 extern struct audit_chunk *audit_tree_lookup(const struct inode *);
 extern void audit_put_chunk(struct audit_chunk *);
@@ -130,10 +128,9 @@ extern int audit_add_tree_rule(struct audit_krule *);
 extern int audit_remove_tree_rule(struct audit_krule *);
 extern void audit_trim_trees(void);
 extern int audit_tag_tree(char *old, char *new);
-extern void audit_schedule_prune(void);
-extern void audit_prune_trees(void);
 extern const char *audit_tree_path(struct audit_tree *);
 extern void audit_put_tree(struct audit_tree *);
+extern void audit_kill_trees(struct list_head *);
 #else
 #define audit_remove_tree_rule(rule) BUG()
 #define audit_add_tree_rule(rule) -EINVAL
@@ -142,6 +139,7 @@ extern void audit_put_tree(struct audit_tree *);
 #define audit_put_tree(tree) (void)0
 #define audit_tag_tree(old, new) -EINVAL
 #define audit_tree_path(rule) ""       /* never called */
+#define audit_kill_trees(list) BUG()
 #endif
 
 extern char *audit_unpack_string(void **, size_t *, size_t);
@@ -160,7 +158,10 @@ static inline int audit_signal_info(int sig, struct task_struct *t)
        return 0;
 }
 extern void audit_filter_inodes(struct task_struct *, struct audit_context *);
+extern struct list_head *audit_killed_trees(void);
 #else
 #define audit_signal_info(s,t) AUDIT_DISABLED
 #define audit_filter_inodes(t,c) AUDIT_DISABLED
 #endif
+
+extern struct mutex audit_cmd_mutex;
index 1f6396d766874b1f28577a44812b0d097106cf88..2451dc6f328211d173747865cde60fd49b6c9bbd 100644 (file)
@@ -2,6 +2,7 @@
 #include <linux/inotify.h>
 #include <linux/namei.h>
 #include <linux/mount.h>
+#include <linux/kthread.h>
 
 struct audit_tree;
 struct audit_chunk;
@@ -441,13 +442,11 @@ static void kill_rules(struct audit_tree *tree)
                if (rule->tree) {
                        /* not a half-baked one */
                        ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_CONFIG_CHANGE);
-                       audit_log_format(ab, "op=remove rule dir=");
+                       audit_log_format(ab, "op=");
+                       audit_log_string(ab, "remove rule");
+                       audit_log_format(ab, " dir=");
                        audit_log_untrustedstring(ab, rule->tree->pathname);
-                       if (rule->filterkey) {
-                               audit_log_format(ab, " key=");
-                               audit_log_untrustedstring(ab, rule->filterkey);
-                       } else
-                               audit_log_format(ab, " key=(null)");
+                       audit_log_key(ab, rule->filterkey);
                        audit_log_format(ab, " list=%d res=1", rule->listnr);
                        audit_log_end(ab);
                        rule->tree = NULL;
@@ -519,6 +518,8 @@ static void trim_marked(struct audit_tree *tree)
        }
 }
 
+static void audit_schedule_prune(void);
+
 /* called with audit_filter_mutex */
 int audit_remove_tree_rule(struct audit_krule *rule)
 {
@@ -824,10 +825,11 @@ int audit_tag_tree(char *old, char *new)
 
 /*
  * That gets run when evict_chunk() ends up needing to kill audit_tree.
- * Runs from a separate thread, with audit_cmd_mutex held.
+ * Runs from a separate thread.
  */
-void audit_prune_trees(void)
+static int prune_tree_thread(void *unused)
 {
+       mutex_lock(&audit_cmd_mutex);
        mutex_lock(&audit_filter_mutex);
 
        while (!list_empty(&prune_list)) {
@@ -844,6 +846,40 @@ void audit_prune_trees(void)
        }
 
        mutex_unlock(&audit_filter_mutex);
+       mutex_unlock(&audit_cmd_mutex);
+       return 0;
+}
+
+static void audit_schedule_prune(void)
+{
+       kthread_run(prune_tree_thread, NULL, "audit_prune_tree");
+}
+
+/*
+ * ... and that one is done if evict_chunk() decides to delay until the end
+ * of syscall.  Runs synchronously.
+ */
+void audit_kill_trees(struct list_head *list)
+{
+       mutex_lock(&audit_cmd_mutex);
+       mutex_lock(&audit_filter_mutex);
+
+       while (!list_empty(list)) {
+               struct audit_tree *victim;
+
+               victim = list_entry(list->next, struct audit_tree, list);
+               kill_rules(victim);
+               list_del_init(&victim->list);
+
+               mutex_unlock(&audit_filter_mutex);
+
+               prune_one(victim);
+
+               mutex_lock(&audit_filter_mutex);
+       }
+
+       mutex_unlock(&audit_filter_mutex);
+       mutex_unlock(&audit_cmd_mutex);
 }
 
 /*
@@ -854,6 +890,8 @@ void audit_prune_trees(void)
 static void evict_chunk(struct audit_chunk *chunk)
 {
        struct audit_tree *owner;
+       struct list_head *postponed = audit_killed_trees();
+       int need_prune = 0;
        int n;
 
        if (chunk->dead)
@@ -869,15 +907,21 @@ static void evict_chunk(struct audit_chunk *chunk)
                owner->root = NULL;
                list_del_init(&owner->same_root);
                spin_unlock(&hash_lock);
-               kill_rules(owner);
-               list_move(&owner->list, &prune_list);
-               audit_schedule_prune();
+               if (!postponed) {
+                       kill_rules(owner);
+                       list_move(&owner->list, &prune_list);
+                       need_prune = 1;
+               } else {
+                       list_move(&owner->list, postponed);
+               }
                spin_lock(&hash_lock);
        }
        list_del_rcu(&chunk->hash);
        for (n = 0; n < chunk->count; n++)
                list_del_init(&chunk->owners[n].list);
        spin_unlock(&hash_lock);
+       if (need_prune)
+               audit_schedule_prune();
        mutex_unlock(&audit_filter_mutex);
 }
 
diff --git a/kernel/audit_watch.c b/kernel/audit_watch.c
new file mode 100644 (file)
index 0000000..0e96dbc
--- /dev/null
@@ -0,0 +1,543 @@
+/* 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/namei.h>
+#include <linux/netlink.h>
+#include <linux/sched.h>
+#include <linux/inotify.h>
+#include <linux/security.h>
+#include "audit.h"
+
+/*
+ * Reference counting:
+ *
+ * audit_parent: lifetime is from audit_init_parent() to receipt of an IN_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 */
+       char                    *path;  /* insertion path */
+       dev_t                   dev;    /* associated superblock device */
+       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;  /* associated rules */
+};
+
+struct audit_parent {
+       struct list_head        ilist;  /* entry in inotify registration list */
+       struct list_head        watches; /* associated watches */
+       struct inotify_watch    wdata;  /* inotify watch data */
+       unsigned                flags;  /* status flags */
+};
+
+/* Inotify handle. */
+struct inotify_handle *audit_ih;
+
+/*
+ * audit_parent status flags:
+ *
+ * AUDIT_PARENT_INVALID - set anytime rules/watches are auto-removed due to
+ * a filesystem event to ensure we're adding audit watches to a valid parent.
+ * Technically not needed for IN_DELETE_SELF or IN_UNMOUNT events, as we cannot
+ * receive them while we have nameidata, but must be used for IN_MOVE_SELF which
+ * we can receive while holding nameidata.
+ */
+#define AUDIT_PARENT_INVALID   0x001
+
+/* Inotify events we care about. */
+#define AUDIT_IN_WATCH IN_MOVE|IN_CREATE|IN_DELETE|IN_DELETE_SELF|IN_MOVE_SELF
+
+static void audit_free_parent(struct inotify_watch *i_watch)
+{
+       struct audit_parent *parent;
+
+       parent = container_of(i_watch, struct audit_parent, wdata);
+       WARN_ON(!list_empty(&parent->watches));
+       kfree(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);
+       }
+}
+
+void audit_remove_watch(struct audit_watch *watch)
+{
+       list_del(&watch->wlist);
+       put_inotify_watch(&watch->parent->wdata);
+       watch->parent = NULL;
+       audit_put_watch(watch); /* match initial get */
+}
+
+char *audit_watch_path(struct audit_watch *watch)
+{
+       return watch->path;
+}
+
+struct list_head *audit_watch_rules(struct audit_watch *watch)
+{
+       return &watch->rules;
+}
+
+unsigned long audit_watch_inode(struct audit_watch *watch)
+{
+       return watch->ino;
+}
+
+dev_t audit_watch_dev(struct audit_watch *watch)
+{
+       return watch->dev;
+}
+
+/* Initialize a parent watch entry. */
+static struct audit_parent *audit_init_parent(struct nameidata *ndp)
+{
+       struct audit_parent *parent;
+       s32 wd;
+
+       parent = kzalloc(sizeof(*parent), GFP_KERNEL);
+       if (unlikely(!parent))
+               return ERR_PTR(-ENOMEM);
+
+       INIT_LIST_HEAD(&parent->watches);
+       parent->flags = 0;
+
+       inotify_init_watch(&parent->wdata);
+       /* grab a ref so inotify watch hangs around until we take audit_filter_mutex */
+       get_inotify_watch(&parent->wdata);
+       wd = inotify_add_watch(audit_ih, &parent->wdata,
+                              ndp->path.dentry->d_inode, AUDIT_IN_WATCH);
+       if (wd < 0) {
+               audit_free_parent(&parent->wdata);
+               return ERR_PTR(wd);
+       }
+
+       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 = (dev_t)-1;
+       watch->ino = (unsigned long)-1;
+
+       return watch;
+}
+
+/* Translate a watch string to kernel respresentation. */
+int audit_to_watch(struct audit_krule *krule, char *path, int len, u32 op)
+{
+       struct audit_watch *watch;
+
+       if (!audit_ih)
+               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);
+
+       audit_get_watch(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;
+       get_inotify_watch(&old->parent->wdata);
+       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);
+               audit_log_format(ab, "auid=%u ses=%u op=",
+                                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);
+       list_for_each_entry_safe(owatch, nextw, &parent->watches, wlist) {
+               if (audit_compare_dname_path(dname, owatch->path, NULL))
+                       continue;
+
+               /* If the update involves invalidating rules, do the inode-based
+                * filtering now, so we don't omit records. */
+               if (invalidating && current->audit_context)
+                       audit_filter_inodes(current, current->audit_context);
+
+               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, nwatch);
+                       if (IS_ERR(nentry)) {
+                               list_del(&oentry->rule.list);
+                               audit_panic("error updating watch, removing");
+                       } else {
+                               int h = audit_hash_ino((u32)ino);
+                               list_add(&nentry->rule.rlist, &nwatch->rules);
+                               list_add_rcu(&nentry->list, &audit_inode_hash[h]);
+                               list_replace(&oentry->rule.list,
+                                            &nentry->rule.list);
+                       }
+
+                       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);
+       parent->flags |= AUDIT_PARENT_INVALID;
+       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");
+                       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);
+}
+
+/* Unregister inotify watches for parents on in_list.
+ * Generates an IN_IGNORED event. */
+void audit_inotify_unregister(struct list_head *in_list)
+{
+       struct audit_parent *p, *n;
+
+       list_for_each_entry_safe(p, n, in_list, ilist) {
+               list_del(&p->ilist);
+               inotify_rm_watch(audit_ih, &p->wdata);
+               /* the unpin matching the pin in audit_do_del_rule() */
+               unpin_inotify_watch(&p->wdata);
+       }
+}
+
+/* Get path information necessary for adding watches. */
+static int audit_get_nd(char *path, struct nameidata **ndp, struct nameidata **ndw)
+{
+       struct nameidata *ndparent, *ndwatch;
+       int err;
+
+       ndparent = kmalloc(sizeof(*ndparent), GFP_KERNEL);
+       if (unlikely(!ndparent))
+               return -ENOMEM;
+
+       ndwatch = kmalloc(sizeof(*ndwatch), GFP_KERNEL);
+       if (unlikely(!ndwatch)) {
+               kfree(ndparent);
+               return -ENOMEM;
+       }
+
+       err = path_lookup(path, LOOKUP_PARENT, ndparent);
+       if (err) {
+               kfree(ndparent);
+               kfree(ndwatch);
+               return err;
+       }
+
+       err = path_lookup(path, 0, ndwatch);
+       if (err) {
+               kfree(ndwatch);
+               ndwatch = NULL;
+       }
+
+       *ndp = ndparent;
+       *ndw = ndwatch;
+
+       return 0;
+}
+
+/* Release resources used for watch path information. */
+static void audit_put_nd(struct nameidata *ndp, struct nameidata *ndw)
+{
+       if (ndp) {
+               path_put(&ndp->path);
+               kfree(ndp);
+       }
+       if (ndw) {
+               path_put(&ndw->path);
+               kfree(ndw);
+       }
+}
+
+/* Associate the given rule with an existing parent inotify_watch.
+ * 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;
+
+       list_for_each_entry(w, &parent->watches, wlist) {
+               if (strcmp(watch->path, w->path))
+                       continue;
+
+               watch_found = 1;
+
+               /* put krule's and initial refs to temporary watch */
+               audit_put_watch(watch);
+               audit_put_watch(watch);
+
+               audit_get_watch(w);
+               krule->watch = watch = w;
+               break;
+       }
+
+       if (!watch_found) {
+               get_inotify_watch(&parent->wdata);
+               watch->parent = parent;
+
+               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 audit_watch *watch = krule->watch;
+       struct inotify_watch *i_watch;
+       struct audit_parent *parent;
+       struct nameidata *ndp = NULL, *ndw = NULL;
+       int ret = 0;
+
+       mutex_unlock(&audit_filter_mutex);
+
+       /* Avoid calling path_lookup under audit_filter_mutex. */
+       ret = audit_get_nd(watch->path, &ndp, &ndw);
+       if (ret) {
+               /* caller expects mutex locked */
+               mutex_lock(&audit_filter_mutex);
+               goto error;
+       }
+
+       /* update watch filter fields */
+       if (ndw) {
+               watch->dev = ndw->path.dentry->d_inode->i_sb->s_dev;
+               watch->ino = ndw->path.dentry->d_inode->i_ino;
+       }
+
+       /* The audit_filter_mutex must not be held during inotify calls because
+        * we hold it during inotify event callback processing.  If an existing
+        * inotify watch is found, inotify_find_watch() grabs a reference before
+        * returning.
+        */
+       if (inotify_find_watch(audit_ih, ndp->path.dentry->d_inode,
+                              &i_watch) < 0) {
+               parent = audit_init_parent(ndp);
+               if (IS_ERR(parent)) {
+                       /* caller expects mutex locked */
+                       mutex_lock(&audit_filter_mutex);
+                       ret = PTR_ERR(parent);
+                       goto error;
+               }
+       } else
+               parent = container_of(i_watch, struct audit_parent, wdata);
+
+       mutex_lock(&audit_filter_mutex);
+
+       /* parent was moved before we took audit_filter_mutex */
+       if (parent->flags & AUDIT_PARENT_INVALID)
+               ret = -ENOENT;
+       else
+               audit_add_to_parent(krule, parent);
+
+       /* match get in audit_init_parent or inotify_find_watch */
+       put_inotify_watch(&parent->wdata);
+
+error:
+       audit_put_nd(ndp, ndw);         /* NULL args OK */
+       return ret;
+
+}
+
+void audit_remove_watch_rule(struct audit_krule *krule, struct list_head *list)
+{
+       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)) {
+                       /* Put parent on the inotify un-registration
+                        * list.  Grab a reference before releasing
+                        * audit_filter_mutex, to be released in
+                        * audit_inotify_unregister().
+                        * If filesystem is going away, just leave
+                        * the sucker alone, eviction will take
+                        * care of it. */
+                       if (pin_inotify_watch(&parent->wdata))
+                               list_add(&parent->ilist, list);
+               }
+       }
+}
+
+/* Update watch data in audit rules based on inotify events. */
+static void audit_handle_ievent(struct inotify_watch *i_watch, u32 wd, u32 mask,
+                        u32 cookie, const char *dname, struct inode *inode)
+{
+       struct audit_parent *parent;
+
+       parent = container_of(i_watch, struct audit_parent, wdata);
+
+       if (mask & (IN_CREATE|IN_MOVED_TO) && inode)
+               audit_update_watch(parent, dname, inode->i_sb->s_dev,
+                                  inode->i_ino, 0);
+       else if (mask & (IN_DELETE|IN_MOVED_FROM))
+               audit_update_watch(parent, dname, (dev_t)-1, (unsigned long)-1, 1);
+       /* inotify automatically removes the watch and sends IN_IGNORED */
+       else if (mask & (IN_DELETE_SELF|IN_UNMOUNT))
+               audit_remove_parent_watches(parent);
+       /* inotify does not remove the watch, so remove it manually */
+       else if(mask & IN_MOVE_SELF) {
+               audit_remove_parent_watches(parent);
+               inotify_remove_watch_locked(audit_ih, i_watch);
+       } else if (mask & IN_IGNORED)
+               put_inotify_watch(i_watch);
+}
+
+static const struct inotify_operations audit_inotify_ops = {
+       .handle_event   = audit_handle_ievent,
+       .destroy_watch  = audit_free_parent,
+};
+
+static int __init audit_watch_init(void)
+{
+       audit_ih = inotify_init(&audit_inotify_ops);
+       if (IS_ERR(audit_ih))
+               audit_panic("cannot initialize inotify handle");
+       return 0;
+}
+subsys_initcall(audit_watch_init);
index 713098ee5a0243c61a30e946f6c34be44de653ca..a70604047f3c9061e81622a3b399b085fe5ac815 100644 (file)
@@ -27,7 +27,6 @@
 #include <linux/namei.h>
 #include <linux/netlink.h>
 #include <linux/sched.h>
-#include <linux/inotify.h>
 #include <linux/security.h>
 #include "audit.h"
 
  *             be written directly provided audit_filter_mutex is held.
  */
 
-/*
- * Reference counting:
- *
- * audit_parent: lifetime is from audit_init_parent() to receipt of an IN_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_parent {
-       struct list_head        ilist;  /* entry in inotify registration list */
-       struct list_head        watches; /* associated watches */
-       struct inotify_watch    wdata;  /* inotify watch data */
-       unsigned                flags;  /* status flags */
-};
-
-/*
- * audit_parent status flags:
- *
- * AUDIT_PARENT_INVALID - set anytime rules/watches are auto-removed due to
- * a filesystem event to ensure we're adding audit watches to a valid parent.
- * Technically not needed for IN_DELETE_SELF or IN_UNMOUNT events, as we cannot
- * receive them while we have nameidata, but must be used for IN_MOVE_SELF which
- * we can receive while holding nameidata.
- */
-#define AUDIT_PARENT_INVALID   0x001
-
 /* Audit filter lists, defined in <linux/audit.h> */
 struct list_head audit_filter_list[AUDIT_NR_FILTERS] = {
        LIST_HEAD_INIT(audit_filter_list[0]),
@@ -97,41 +66,6 @@ static struct list_head audit_rules_list[AUDIT_NR_FILTERS] = {
 
 DEFINE_MUTEX(audit_filter_mutex);
 
-/* Inotify events we care about. */
-#define AUDIT_IN_WATCH IN_MOVE|IN_CREATE|IN_DELETE|IN_DELETE_SELF|IN_MOVE_SELF
-
-void audit_free_parent(struct inotify_watch *i_watch)
-{
-       struct audit_parent *parent;
-
-       parent = container_of(i_watch, struct audit_parent, wdata);
-       WARN_ON(!list_empty(&parent->watches));
-       kfree(parent);
-}
-
-static inline void audit_get_watch(struct audit_watch *watch)
-{
-       atomic_inc(&watch->count);
-}
-
-static 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);
-       put_inotify_watch(&watch->parent->wdata);
-       watch->parent = NULL;
-       audit_put_watch(watch); /* match initial get */
-}
-
 static inline void audit_free_rule(struct audit_entry *e)
 {
        int i;
@@ -156,50 +90,6 @@ void audit_free_rule_rcu(struct rcu_head *head)
        audit_free_rule(e);
 }
 
-/* Initialize a parent watch entry. */
-static struct audit_parent *audit_init_parent(struct nameidata *ndp)
-{
-       struct audit_parent *parent;
-       s32 wd;
-
-       parent = kzalloc(sizeof(*parent), GFP_KERNEL);
-       if (unlikely(!parent))
-               return ERR_PTR(-ENOMEM);
-
-       INIT_LIST_HEAD(&parent->watches);
-       parent->flags = 0;
-
-       inotify_init_watch(&parent->wdata);
-       /* grab a ref so inotify watch hangs around until we take audit_filter_mutex */
-       get_inotify_watch(&parent->wdata);
-       wd = inotify_add_watch(audit_ih, &parent->wdata,
-                              ndp->path.dentry->d_inode, AUDIT_IN_WATCH);
-       if (wd < 0) {
-               audit_free_parent(&parent->wdata);
-               return ERR_PTR(wd);
-       }
-
-       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 = (dev_t)-1;
-       watch->ino = (unsigned long)-1;
-
-       return watch;
-}
-
 /* Initialize an audit filterlist entry. */
 static inline struct audit_entry *audit_init_entry(u32 field_count)
 {
@@ -260,31 +150,6 @@ static inline int audit_to_inode(struct audit_krule *krule,
        return 0;
 }
 
-/* Translate a watch string to kernel respresentation. */
-static int audit_to_watch(struct audit_krule *krule, char *path, int len,
-                         u32 op)
-{
-       struct audit_watch *watch;
-
-       if (!audit_ih)
-               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);
-
-       audit_get_watch(watch);
-       krule->watch = watch;
-
-       return 0;
-}
-
 static __u32 *classes[AUDIT_SYSCALL_CLASSES];
 
 int __init audit_register_class(int class, unsigned *list)
@@ -766,7 +631,8 @@ static struct audit_rule_data *audit_krule_to_data(struct audit_krule *krule)
                        break;
                case AUDIT_WATCH:
                        data->buflen += data->values[i] =
-                               audit_pack_string(&bufp, krule->watch->path);
+                               audit_pack_string(&bufp,
+                                                 audit_watch_path(krule->watch));
                        break;
                case AUDIT_DIR:
                        data->buflen += data->values[i] =
@@ -818,7 +684,8 @@ static int audit_compare_rule(struct audit_krule *a, struct audit_krule *b)
                                return 1;
                        break;
                case AUDIT_WATCH:
-                       if (strcmp(a->watch->path, b->watch->path))
+                       if (strcmp(audit_watch_path(a->watch),
+                                  audit_watch_path(b->watch)))
                                return 1;
                        break;
                case AUDIT_DIR:
@@ -844,32 +711,6 @@ static int audit_compare_rule(struct audit_krule *a, struct audit_krule *b)
        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;
-       get_inotify_watch(&old->parent->wdata);
-       new->parent = old->parent;
-
-out:
-       return new;
-}
-
 /* Duplicate LSM field information.  The lsm_rule is opaque, so must be
  * re-initialized. */
 static inline int audit_dupe_lsm_field(struct audit_field *df,
@@ -904,8 +745,8 @@ static inline int audit_dupe_lsm_field(struct audit_field *df,
  * rule with the new rule in the filterlist, then free the old rule.
  * The rlist element is undefined; list manipulations are handled apart from
  * the initial copy. */
-static struct audit_entry *audit_dupe_rule(struct audit_krule *old,
-                                          struct audit_watch *watch)
+struct audit_entry *audit_dupe_rule(struct audit_krule *old,
+                                   struct audit_watch *watch)
 {
        u32 fcount = old->field_count;
        struct audit_entry *entry;
@@ -977,137 +818,6 @@ static struct audit_entry *audit_dupe_rule(struct audit_krule *old,
        return entry;
 }
 
-/* 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);
-       list_for_each_entry_safe(owatch, nextw, &parent->watches, wlist) {
-               if (audit_compare_dname_path(dname, owatch->path, NULL))
-                       continue;
-
-               /* If the update involves invalidating rules, do the inode-based
-                * filtering now, so we don't omit records. */
-               if (invalidating && current->audit_context)
-                       audit_filter_inodes(current, current->audit_context);
-
-               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, nwatch);
-                       if (IS_ERR(nentry)) {
-                               list_del(&oentry->rule.list);
-                               audit_panic("error updating watch, removing");
-                       } else {
-                               int h = audit_hash_ino((u32)ino);
-                               list_add(&nentry->rule.rlist, &nwatch->rules);
-                               list_add_rcu(&nentry->list, &audit_inode_hash[h]);
-                               list_replace(&oentry->rule.list,
-                                            &nentry->rule.list);
-                       }
-
-                       call_rcu(&oentry->rcu, audit_free_rule_rcu);
-               }
-
-               if (audit_enabled) {
-                       struct audit_buffer *ab;
-                       ab = audit_log_start(NULL, GFP_NOFS,
-                               AUDIT_CONFIG_CHANGE);
-                       audit_log_format(ab, "auid=%u ses=%u",
-                               audit_get_loginuid(current),
-                               audit_get_sessionid(current));
-                       audit_log_format(ab,
-                               " op=updated rules specifying path=");
-                       audit_log_untrustedstring(ab, owatch->path);
-                       audit_log_format(ab, " with dev=%u ino=%lu\n",
-                                dev, ino);
-                       audit_log_format(ab, " list=%d res=1", r->listnr);
-                       audit_log_end(ab);
-               }
-               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);
-       parent->flags |= AUDIT_PARENT_INVALID;
-       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);
-                       if (audit_enabled) {
-                               struct audit_buffer *ab;
-                               ab = audit_log_start(NULL, GFP_NOFS,
-                                       AUDIT_CONFIG_CHANGE);
-                               audit_log_format(ab, "auid=%u ses=%u",
-                                       audit_get_loginuid(current),
-                                       audit_get_sessionid(current));
-                               audit_log_format(ab, " op=remove rule path=");
-                               audit_log_untrustedstring(ab, w->path);
-                               if (r->filterkey) {
-                                       audit_log_format(ab, " key=");
-                                       audit_log_untrustedstring(ab,
-                                                       r->filterkey);
-                               } else
-                                       audit_log_format(ab, " key=(null)");
-                               audit_log_format(ab, " list=%d res=1",
-                                       r->listnr);
-                               audit_log_end(ab);
-                       }
-                       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);
-}
-
-/* Unregister inotify watches for parents on in_list.
- * Generates an IN_IGNORED event. */
-static void audit_inotify_unregister(struct list_head *in_list)
-{
-       struct audit_parent *p, *n;
-
-       list_for_each_entry_safe(p, n, in_list, ilist) {
-               list_del(&p->ilist);
-               inotify_rm_watch(audit_ih, &p->wdata);
-               /* the unpin matching the pin in audit_do_del_rule() */
-               unpin_inotify_watch(&p->wdata);
-       }
-}
-
 /* Find an existing audit rule.
  * Caller must hold audit_filter_mutex to prevent stale rule data. */
 static struct audit_entry *audit_find_rule(struct audit_entry *entry,
@@ -1145,134 +855,6 @@ out:
        return found;
 }
 
-/* Get path information necessary for adding watches. */
-static int audit_get_nd(char *path, struct nameidata **ndp,
-                       struct nameidata **ndw)
-{
-       struct nameidata *ndparent, *ndwatch;
-       int err;
-
-       ndparent = kmalloc(sizeof(*ndparent), GFP_KERNEL);
-       if (unlikely(!ndparent))
-               return -ENOMEM;
-
-       ndwatch = kmalloc(sizeof(*ndwatch), GFP_KERNEL);
-       if (unlikely(!ndwatch)) {
-               kfree(ndparent);
-               return -ENOMEM;
-       }
-
-       err = path_lookup(path, LOOKUP_PARENT, ndparent);
-       if (err) {
-               kfree(ndparent);
-               kfree(ndwatch);
-               return err;
-       }
-
-       err = path_lookup(path, 0, ndwatch);
-       if (err) {
-               kfree(ndwatch);
-               ndwatch = NULL;
-       }
-
-       *ndp = ndparent;
-       *ndw = ndwatch;
-
-       return 0;
-}
-
-/* Release resources used for watch path information. */
-static void audit_put_nd(struct nameidata *ndp, struct nameidata *ndw)
-{
-       if (ndp) {
-               path_put(&ndp->path);
-               kfree(ndp);
-       }
-       if (ndw) {
-               path_put(&ndw->path);
-               kfree(ndw);
-       }
-}
-
-/* Associate the given rule with an existing parent inotify_watch.
- * 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;
-
-       list_for_each_entry(w, &parent->watches, wlist) {
-               if (strcmp(watch->path, w->path))
-                       continue;
-
-               watch_found = 1;
-
-               /* put krule's and initial refs to temporary watch */
-               audit_put_watch(watch);
-               audit_put_watch(watch);
-
-               audit_get_watch(w);
-               krule->watch = watch = w;
-               break;
-       }
-
-       if (!watch_found) {
-               get_inotify_watch(&parent->wdata);
-               watch->parent = parent;
-
-               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. */
-static int audit_add_watch(struct audit_krule *krule, struct nameidata *ndp,
-                          struct nameidata *ndw)
-{
-       struct audit_watch *watch = krule->watch;
-       struct inotify_watch *i_watch;
-       struct audit_parent *parent;
-       int ret = 0;
-
-       /* update watch filter fields */
-       if (ndw) {
-               watch->dev = ndw->path.dentry->d_inode->i_sb->s_dev;
-               watch->ino = ndw->path.dentry->d_inode->i_ino;
-       }
-
-       /* The audit_filter_mutex must not be held during inotify calls because
-        * we hold it during inotify event callback processing.  If an existing
-        * inotify watch is found, inotify_find_watch() grabs a reference before
-        * returning.
-        */
-       mutex_unlock(&audit_filter_mutex);
-
-       if (inotify_find_watch(audit_ih, ndp->path.dentry->d_inode,
-                              &i_watch) < 0) {
-               parent = audit_init_parent(ndp);
-               if (IS_ERR(parent)) {
-                       /* caller expects mutex locked */
-                       mutex_lock(&audit_filter_mutex);
-                       return PTR_ERR(parent);
-               }
-       } else
-               parent = container_of(i_watch, struct audit_parent, wdata);
-
-       mutex_lock(&audit_filter_mutex);
-
-       /* parent was moved before we took audit_filter_mutex */
-       if (parent->flags & AUDIT_PARENT_INVALID)
-               ret = -ENOENT;
-       else
-               audit_add_to_parent(krule, parent);
-
-       /* match get in audit_init_parent or inotify_find_watch */
-       put_inotify_watch(&parent->wdata);
-       return ret;
-}
-
 static u64 prio_low = ~0ULL/2;
 static u64 prio_high = ~0ULL/2 - 1;
 
@@ -1282,7 +864,6 @@ static inline int audit_add_rule(struct audit_entry *entry)
        struct audit_entry *e;
        struct audit_watch *watch = entry->rule.watch;
        struct audit_tree *tree = entry->rule.tree;
-       struct nameidata *ndp = NULL, *ndw = NULL;
        struct list_head *list;
        int h, err;
 #ifdef CONFIG_AUDITSYSCALL
@@ -1296,8 +877,8 @@ static inline int audit_add_rule(struct audit_entry *entry)
 
        mutex_lock(&audit_filter_mutex);
        e = audit_find_rule(entry, &list);
-       mutex_unlock(&audit_filter_mutex);
        if (e) {
+               mutex_unlock(&audit_filter_mutex);
                err = -EEXIST;
                /* normally audit_add_tree_rule() will free it on failure */
                if (tree)
@@ -1305,22 +886,16 @@ static inline int audit_add_rule(struct audit_entry *entry)
                goto error;
        }
 
-       /* Avoid calling path_lookup under audit_filter_mutex. */
-       if (watch) {
-               err = audit_get_nd(watch->path, &ndp, &ndw);
-               if (err)
-                       goto error;
-       }
-
-       mutex_lock(&audit_filter_mutex);
        if (watch) {
                /* audit_filter_mutex is dropped and re-taken during this call */
-               err = audit_add_watch(&entry->rule, ndp, ndw);
+               err = audit_add_watch(&entry->rule);
                if (err) {
                        mutex_unlock(&audit_filter_mutex);
                        goto error;
                }
-               h = audit_hash_ino((u32)watch->ino);
+               /* entry->rule.watch may have changed during audit_add_watch() */
+               watch = entry->rule.watch;
+               h = audit_hash_ino((u32)audit_watch_inode(watch));
                list = &audit_inode_hash[h];
        }
        if (tree) {
@@ -1358,11 +933,9 @@ static inline int audit_add_rule(struct audit_entry *entry)
 #endif
        mutex_unlock(&audit_filter_mutex);
 
-       audit_put_nd(ndp, ndw);         /* NULL args OK */
        return 0;
 
 error:
-       audit_put_nd(ndp, ndw);         /* NULL args OK */
        if (watch)
                audit_put_watch(watch); /* tmp watch, matches initial get */
        return err;
@@ -1372,7 +945,7 @@ error:
 static inline int audit_del_rule(struct audit_entry *entry)
 {
        struct audit_entry  *e;
-       struct audit_watch *watch, *tmp_watch = entry->rule.watch;
+       struct audit_watch *watch = entry->rule.watch;
        struct audit_tree *tree = entry->rule.tree;
        struct list_head *list;
        LIST_HEAD(inotify_list);
@@ -1394,29 +967,8 @@ static inline int audit_del_rule(struct audit_entry *entry)
                goto out;
        }
 
-       watch = e->rule.watch;
-       if (watch) {
-               struct audit_parent *parent = watch->parent;
-
-               list_del(&e->rule.rlist);
-
-               if (list_empty(&watch->rules)) {
-                       audit_remove_watch(watch);
-
-                       if (list_empty(&parent->watches)) {
-                               /* Put parent on the inotify un-registration
-                                * list.  Grab a reference before releasing
-                                * audit_filter_mutex, to be released in
-                                * audit_inotify_unregister().
-                                * If filesystem is going away, just leave
-                                * the sucker alone, eviction will take
-                                * care of it.
-                                */
-                               if (pin_inotify_watch(&parent->wdata))
-                                       list_add(&parent->ilist, &inotify_list);
-                       }
-               }
-       }
+       if (e->rule.watch)
+               audit_remove_watch_rule(&e->rule, &inotify_list);
 
        if (e->rule.tree)
                audit_remove_tree_rule(&e->rule);
@@ -1438,8 +990,8 @@ static inline int audit_del_rule(struct audit_entry *entry)
                audit_inotify_unregister(&inotify_list);
 
 out:
-       if (tmp_watch)
-               audit_put_watch(tmp_watch); /* match initial get */
+       if (watch)
+               audit_put_watch(watch); /* match initial get */
        if (tree)
                audit_put_tree(tree);   /* that's the temporary one */
 
@@ -1527,11 +1079,9 @@ static void audit_log_rule_change(uid_t loginuid, u32 sessionid, u32 sid,
                        security_release_secctx(ctx, len);
                }
        }
-       audit_log_format(ab, " op=%s rule key=", action);
-       if (rule->filterkey)
-               audit_log_untrustedstring(ab, rule->filterkey);
-       else
-               audit_log_format(ab, "(null)");
+       audit_log_format(ab, " op=");
+       audit_log_string(ab, action);
+       audit_log_key(ab, rule->filterkey);
        audit_log_format(ab, " list=%d res=%d", rule->listnr, res);
        audit_log_end(ab);
 }
@@ -1595,7 +1145,7 @@ int audit_receive_filter(int type, int pid, int uid, int seq, void *data,
                        return PTR_ERR(entry);
 
                err = audit_add_rule(entry);
-               audit_log_rule_change(loginuid, sessionid, sid, "add",
+               audit_log_rule_change(loginuid, sessionid, sid, "add rule",
                                      &entry->rule, !err);
 
                if (err)
@@ -1611,7 +1161,7 @@ int audit_receive_filter(int type, int pid, int uid, int seq, void *data,
                        return PTR_ERR(entry);
 
                err = audit_del_rule(entry);
-               audit_log_rule_change(loginuid, sessionid, sid, "remove",
+               audit_log_rule_change(loginuid, sessionid, sid, "remove rule",
                                      &entry->rule, !err);
 
                audit_free_rule(entry);
@@ -1793,7 +1343,7 @@ static int update_lsm_rule(struct audit_krule *r)
                list_del(&r->list);
        } else {
                if (watch) {
-                       list_add(&nentry->rule.rlist, &watch->rules);
+                       list_add(&nentry->rule.rlist, audit_watch_rules(watch));
                        list_del(&r->rlist);
                } else if (tree)
                        list_replace_init(&r->rlist, &nentry->rule.rlist);
@@ -1829,27 +1379,3 @@ int audit_update_lsm_rules(void)
 
        return err;
 }
-
-/* Update watch data in audit rules based on inotify events. */
-void audit_handle_ievent(struct inotify_watch *i_watch, u32 wd, u32 mask,
-                        u32 cookie, const char *dname, struct inode *inode)
-{
-       struct audit_parent *parent;
-
-       parent = container_of(i_watch, struct audit_parent, wdata);
-
-       if (mask & (IN_CREATE|IN_MOVED_TO) && inode)
-               audit_update_watch(parent, dname, inode->i_sb->s_dev,
-                                  inode->i_ino, 0);
-       else if (mask & (IN_DELETE|IN_MOVED_FROM))
-               audit_update_watch(parent, dname, (dev_t)-1, (unsigned long)-1, 1);
-       /* inotify automatically removes the watch and sends IN_IGNORED */
-       else if (mask & (IN_DELETE_SELF|IN_UNMOUNT))
-               audit_remove_parent_watches(parent);
-       /* inotify does not remove the watch, so remove it manually */
-       else if(mask & IN_MOVE_SELF) {
-               audit_remove_parent_watches(parent);
-               inotify_remove_watch_locked(audit_ih, i_watch);
-       } else if (mask & IN_IGNORED)
-               put_inotify_watch(i_watch);
-}
index 7d6ac7c1f414479ada4a58af0c4b9e241051062e..68d3c6a0ecd635bbeba49c5de2d3e89b50315897 100644 (file)
@@ -199,6 +199,7 @@ struct audit_context {
 
        struct audit_tree_refs *trees, *first_trees;
        int tree_count;
+       struct list_head killed_trees;
 
        int type;
        union {
@@ -548,9 +549,9 @@ static int audit_filter_rules(struct task_struct *tsk,
                        }
                        break;
                case AUDIT_WATCH:
-                       if (name && rule->watch->ino != (unsigned long)-1)
-                               result = (name->dev == rule->watch->dev &&
-                                         name->ino == rule->watch->ino);
+                       if (name && audit_watch_inode(rule->watch) != (unsigned long)-1)
+                               result = (name->dev == audit_watch_dev(rule->watch) &&
+                                         name->ino == audit_watch_inode(rule->watch));
                        break;
                case AUDIT_DIR:
                        if (ctx)
@@ -853,6 +854,7 @@ static inline struct audit_context *audit_alloc_context(enum audit_state state)
        if (!(context = kmalloc(sizeof(*context), GFP_KERNEL)))
                return NULL;
        audit_zero_context(context, state);
+       INIT_LIST_HEAD(&context->killed_trees);
        return context;
 }
 
@@ -1024,8 +1026,8 @@ static int audit_log_single_execve_arg(struct audit_context *context,
 {
        char arg_num_len_buf[12];
        const char __user *tmp_p = p;
-       /* how many digits are in arg_num? 3 is the length of " a=" */
-       size_t arg_num_len = snprintf(arg_num_len_buf, 12, "%d", arg_num) + 3;
+       /* how many digits are in arg_num? 5 is the length of ' a=""' */
+       size_t arg_num_len = snprintf(arg_num_len_buf, 12, "%d", arg_num) + 5;
        size_t len, len_left, to_send;
        size_t max_execve_audit_len = MAX_EXECVE_AUDIT_LEN;
        unsigned int i, has_cntl = 0, too_long = 0;
@@ -1137,7 +1139,7 @@ static int audit_log_single_execve_arg(struct audit_context *context,
                if (has_cntl)
                        audit_log_n_hex(*ab, buf, to_send);
                else
-                       audit_log_format(*ab, "\"%s\"", buf);
+                       audit_log_string(*ab, buf);
 
                p += to_send;
                len_left -= to_send;
@@ -1372,11 +1374,7 @@ static void audit_log_exit(struct audit_context *context, struct task_struct *ts
 
 
        audit_log_task_info(ab, tsk);
-       if (context->filterkey) {
-               audit_log_format(ab, " key=");
-               audit_log_untrustedstring(ab, context->filterkey);
-       } else
-               audit_log_format(ab, " key=(null)");
+       audit_log_key(ab, context->filterkey);
        audit_log_end(ab);
 
        for (aux = context->aux; aux; aux = aux->next) {
@@ -1549,6 +1547,8 @@ void audit_free(struct task_struct *tsk)
        /* that can happen only if we are called from do_exit() */
        if (context->in_syscall && context->current_state == AUDIT_RECORD_CONTEXT)
                audit_log_exit(context, tsk);
+       if (!list_empty(&context->killed_trees))
+               audit_kill_trees(&context->killed_trees);
 
        audit_free_context(context);
 }
@@ -1692,6 +1692,9 @@ void audit_syscall_exit(int valid, long return_code)
        context->in_syscall = 0;
        context->prio = context->state == AUDIT_RECORD_CONTEXT ? ~0ULL : 0;
 
+       if (!list_empty(&context->killed_trees))
+               audit_kill_trees(&context->killed_trees);
+
        if (context->previous) {
                struct audit_context *new_context = context->previous;
                context->previous  = NULL;
@@ -2525,3 +2528,11 @@ void audit_core_dumps(long signr)
        audit_log_format(ab, " sig=%ld", signr);
        audit_log_end(ab);
 }
+
+struct list_head *audit_killed_trees(void)
+{
+       struct audit_context *ctx = current->audit_context;
+       if (likely(!ctx || !ctx->in_syscall))
+               return NULL;
+       return &ctx->killed_trees;
+}