Merge branch 'stable-4.13' of git://git.infradead.org/users/pcmoore/audit

Pull audit updates from Paul Moore:
 "Things are relatively quiet on the audit front for v4.13, just five
  patches for a total diffstat of 102 lines.

  There are two patches from Richard to consistently record the POSIX
  capabilities and add the ambient capability information as well.

  I also chipped in two patches to fix a race condition with the auditd
  tracking code and ensure we don't skip sending any records to the
  audit multicast group.

  Finally a single style fix that I accepted because I must have been in
  a good mood that day.

  Everything passes our test suite, and should be relatively harmless,
  please merge for v4.13"

* 'stable-4.13' of git://git.infradead.org/users/pcmoore/audit:
  audit: make sure we never skip the multicast broadcast
  audit: fix a race condition with the auditd tracking code
  audit: style fix
  audit: add ambient capabilities to CAPSET and BPRM_FCAPS records
  audit: unswing cap_* fields in PATH records

diff --git a/kernel/audit.c b/kernel/audit.c
index 4b7d49868ce1e39d11603f6160d04e7e5d4457e2..833267bbd80bc62b367699eb9cdc646c20fb264c 100644 (file)
--- a/kernel/audit.c
+++ b/kernel/audit.c
@@ -575,12 +575,16 @@ static void kauditd_retry_skb(struct sk_buff *skb)
 
 /**
  * auditd_reset - Disconnect the auditd connection
+ * @ac: auditd connection state
  *
  * Description:
  * Break the auditd/kauditd connection and move all the queued records into the
- * hold queue in case auditd reconnects.
+ * hold queue in case auditd reconnects.  It is important to note that the @ac
+ * pointer should never be dereferenced inside this function as it may be NULL
+ * or invalid, you can only compare the memory address!  If @ac is NULL then
+ * the connection will always be reset.
  */
-static void auditd_reset(void)
+static void auditd_reset(const struct auditd_connection *ac)
 {
        unsigned long flags;
        struct sk_buff *skb;
@@ -590,17 +594,21 @@ static void auditd_reset(void)
        spin_lock_irqsave(&auditd_conn_lock, flags);
        ac_old = rcu_dereference_protected(auditd_conn,
                                           lockdep_is_held(&auditd_conn_lock));
+       if (ac && ac != ac_old) {
+               /* someone already registered a new auditd connection */
+               spin_unlock_irqrestore(&auditd_conn_lock, flags);
+               return;
+       }
        rcu_assign_pointer(auditd_conn, NULL);
        spin_unlock_irqrestore(&auditd_conn_lock, flags);
 
        if (ac_old)
                call_rcu(&ac_old->rcu, auditd_conn_free);
 
-       /* flush all of the main and retry queues to the hold queue */
+       /* flush the retry queue to the hold queue, but don't touch the main
+        * queue since we need to process that normally for multicast */
        while ((skb = skb_dequeue(&audit_retry_queue)))
                kauditd_hold_skb(skb);
-       while ((skb = skb_dequeue(&audit_queue)))
-               kauditd_hold_skb(skb);
 }
 
 /**
@@ -649,8 +657,8 @@ static int auditd_send_unicast_skb(struct sk_buff *skb)
        return rc;
 
 err:
-       if (rc == -ECONNREFUSED)
-               auditd_reset();
+       if (ac && rc == -ECONNREFUSED)
+               auditd_reset(ac);
        return rc;
 }
 
@@ -795,9 +803,9 @@ static int kauditd_thread(void *dummy)
                rc = kauditd_send_queue(sk, portid,
                                        &audit_hold_queue, UNICAST_RETRIES,
                                        NULL, kauditd_rehold_skb);
-               if (rc < 0) {
+               if (ac && rc < 0) {
                        sk = NULL;
-                       auditd_reset();
+                       auditd_reset(ac);
                        goto main_queue;
                }
 
@@ -805,9 +813,9 @@ static int kauditd_thread(void *dummy)
                rc = kauditd_send_queue(sk, portid,
                                        &audit_retry_queue, UNICAST_RETRIES,
                                        NULL, kauditd_hold_skb);
-               if (rc < 0) {
+               if (ac && rc < 0) {
                        sk = NULL;
-                       auditd_reset();
+                       auditd_reset(ac);
                        goto main_queue;
                }
 
@@ -815,12 +823,13 @@ main_queue:
                /* process the main queue - do the multicast send and attempt
                 * unicast, dump failed record sends to the retry queue; if
                 * sk == NULL due to previous failures we will just do the
-                * multicast send and move the record to the retry queue */
+                * multicast send and move the record to the hold queue */
                rc = kauditd_send_queue(sk, portid, &audit_queue, 1,
                                        kauditd_send_multicast_skb,
-                                       kauditd_retry_skb);
-               if (sk == NULL || rc < 0)
-                       auditd_reset();
+                                       (sk ?
+                                        kauditd_retry_skb : kauditd_hold_skb));
+               if (ac && rc < 0)
+                       auditd_reset(ac);
                sk = NULL;
 
                /* drop our netns reference, no auditd sends past this line */
@@ -1230,7 +1239,7 @@ static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
                                                                auditd_pid, 1);
 
                                /* unregister the auditd connection */
-                               auditd_reset();
+                               auditd_reset(NULL);
                        }
                }
                if (s.mask & AUDIT_STATUS_RATE_LIMIT) {
@@ -1999,22 +2008,10 @@ void audit_log_cap(struct audit_buffer *ab, char *prefix, kernel_cap_t *cap)
 
 static void audit_log_fcaps(struct audit_buffer *ab, struct audit_names *name)
 {
-       kernel_cap_t *perm = &name->fcap.permitted;
-       kernel_cap_t *inh = &name->fcap.inheritable;
-       int log = 0;
-
-       if (!cap_isclear(*perm)) {
-               audit_log_cap(ab, "cap_fp", perm);
-               log = 1;
-       }
-       if (!cap_isclear(*inh)) {
-               audit_log_cap(ab, "cap_fi", inh);
-               log = 1;
-       }
-
-       if (log)
-               audit_log_format(ab, " cap_fe=%d cap_fver=%x",
-                                name->fcap.fE, name->fcap_ver);
+       audit_log_cap(ab, "cap_fp", &name->fcap.permitted);
+       audit_log_cap(ab, "cap_fi", &name->fcap.inheritable);
+       audit_log_format(ab, " cap_fe=%d cap_fver=%x",
+                        name->fcap.fE, name->fcap_ver);
 }
 
 static inline int audit_copy_fcaps(struct audit_names *name,

diff --git a/kernel/audit.h b/kernel/audit.h
index ddfce2ea4891221a49e9fc3e7f744920c1e67f8b..b331d9b83f6344c9194462bf31dc1e55e7e7c0d8 100644 (file)
--- a/kernel/audit.h
+++ b/kernel/audit.h
@@ -68,6 +68,7 @@ struct audit_cap_data {
                unsigned int    fE;             /* effective bit of file cap */
                kernel_cap_t    effective;      /* effective set of process */
        };
+       kernel_cap_t            ambient;
 };
 
 /* When fs/namei.c:getname() is called, we store the pointer in name and bump
@@ -247,13 +248,13 @@ struct audit_netlink_list {
        struct sk_buff_head q;
 };
 
-int audit_send_list(void *);
+int audit_send_list(void *_dest);
 
 extern int selinux_audit_rule_update(void);
 
 extern struct mutex audit_filter_mutex;
-extern int audit_del_rule(struct audit_entry *);
-extern void audit_free_rule_rcu(struct rcu_head *);
+extern int audit_del_rule(struct audit_entry *entry);
+extern void audit_free_rule_rcu(struct rcu_head *head);
 extern struct list_head audit_filter_list[];
 
 extern struct audit_entry *audit_dupe_rule(struct audit_krule *old);
@@ -301,17 +302,17 @@ extern int audit_exe_compare(struct task_struct *tsk, struct audit_fsnotify_mark
 #endif /* CONFIG_AUDIT_WATCH */
 
 #ifdef CONFIG_AUDIT_TREE
-extern struct audit_chunk *audit_tree_lookup(const struct inode *);
-extern void audit_put_chunk(struct audit_chunk *);
-extern bool audit_tree_match(struct audit_chunk *, struct audit_tree *);
-extern int audit_make_tree(struct audit_krule *, char *, u32);
-extern int audit_add_tree_rule(struct audit_krule *);
-extern int audit_remove_tree_rule(struct audit_krule *);
+extern struct audit_chunk *audit_tree_lookup(const struct inode *inode);
+extern void audit_put_chunk(struct audit_chunk *chunk);
+extern bool audit_tree_match(struct audit_chunk *chunk, struct audit_tree *tree);
+extern int audit_make_tree(struct audit_krule *rule, char *pathname, u32 op);
+extern int audit_add_tree_rule(struct audit_krule *rule);
+extern int audit_remove_tree_rule(struct audit_krule *rule);
 extern void audit_trim_trees(void);
 extern int audit_tag_tree(char *old, char *new);
-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 *);
+extern const char *audit_tree_path(struct audit_tree *tree);
+extern void audit_put_tree(struct audit_tree *tree);
+extern void audit_kill_trees(struct list_head *list);
 #else
 #define audit_remove_tree_rule(rule) BUG()
 #define audit_add_tree_rule(rule) -EINVAL
@@ -323,7 +324,7 @@ extern void audit_kill_trees(struct list_head *);
 #define audit_kill_trees(list) BUG()
 #endif
 
-extern char *audit_unpack_string(void **, size_t *, size_t);
+extern char *audit_unpack_string(void **bufp, size_t *remain, size_t len);
 
 extern pid_t audit_sig_pid;
 extern kuid_t audit_sig_uid;
@@ -333,7 +334,7 @@ extern int audit_filter(int msgtype, unsigned int listtype);
 
 #ifdef CONFIG_AUDITSYSCALL
 extern int audit_signal_info(int sig, struct task_struct *t);
-extern void audit_filter_inodes(struct task_struct *, struct audit_context *);
+extern void audit_filter_inodes(struct task_struct *tsk, struct audit_context *ctx);
 extern struct list_head *audit_killed_trees(void);
 #else
 #define audit_signal_info(s,t) AUDIT_DISABLED

diff --git a/kernel/auditsc.c b/kernel/auditsc.c
index bb724baa7ac9443b9b0f56b8d046b5ab3de17a65..3260ba2312a95e4e500513d5277426e0582b868f 100644 (file)
--- a/kernel/auditsc.c
+++ b/kernel/auditsc.c
@@ -1261,6 +1261,7 @@ static void show_special(struct audit_context *context, int *call_panic)
                audit_log_cap(ab, "cap_pi", &context->capset.cap.inheritable);
                audit_log_cap(ab, "cap_pp", &context->capset.cap.permitted);
                audit_log_cap(ab, "cap_pe", &context->capset.cap.effective);
+               audit_log_cap(ab, "cap_pa", &context->capset.cap.ambient);
                break;
        case AUDIT_MMAP:
                audit_log_format(ab, "fd=%d flags=0x%x", context->mmap.fd,
@@ -1382,9 +1383,11 @@ static void audit_log_exit(struct audit_context *context, struct task_struct *ts
                        audit_log_cap(ab, "old_pp", &axs->old_pcap.permitted);
                        audit_log_cap(ab, "old_pi", &axs->old_pcap.inheritable);
                        audit_log_cap(ab, "old_pe", &axs->old_pcap.effective);
-                       audit_log_cap(ab, "new_pp", &axs->new_pcap.permitted);
-                       audit_log_cap(ab, "new_pi", &axs->new_pcap.inheritable);
-                       audit_log_cap(ab, "new_pe", &axs->new_pcap.effective);
+                       audit_log_cap(ab, "old_pa", &axs->old_pcap.ambient);
+                       audit_log_cap(ab, "pp", &axs->new_pcap.permitted);
+                       audit_log_cap(ab, "pi", &axs->new_pcap.inheritable);
+                       audit_log_cap(ab, "pe", &axs->new_pcap.effective);
+                       audit_log_cap(ab, "pa", &axs->new_pcap.ambient);
                        break; }
 
                }
@@ -2342,10 +2345,12 @@ int __audit_log_bprm_fcaps(struct linux_binprm *bprm,
        ax->old_pcap.permitted   = old->cap_permitted;
        ax->old_pcap.inheritable = old->cap_inheritable;
        ax->old_pcap.effective   = old->cap_effective;
+       ax->old_pcap.ambient     = old->cap_ambient;
 
        ax->new_pcap.permitted   = new->cap_permitted;
        ax->new_pcap.inheritable = new->cap_inheritable;
        ax->new_pcap.effective   = new->cap_effective;
+       ax->new_pcap.ambient     = new->cap_ambient;
        return 0;
 }
 
@@ -2364,6 +2369,7 @@ void __audit_log_capset(const struct cred *new, const struct cred *old)
        context->capset.cap.effective   = new->cap_effective;
        context->capset.cap.inheritable = new->cap_effective;
        context->capset.cap.permitted   = new->cap_permitted;
+       context->capset.cap.ambient     = new->cap_ambient;
        context->type = AUDIT_CAPSET;
 }