signalfd: fix for incorrect SI_QUEUE user data reporting

[linux-2.6-omap-h63xx.git] / kernel / audit.c

diff --git a/kernel/audit.c b/kernel/audit.c
index b617f69fd4e87b86c6c13b7711b3e248caabaa5f..b782b046543ddc9ad04541085717ed0881a3051f 100644 (file)
--- a/kernel/audit.c
+++ b/kernel/audit.c
@@ -78,9 +78,13 @@ static int   audit_default;
 /* If auditing cannot proceed, audit_failure selects what happens. */
 static int     audit_failure = AUDIT_FAIL_PRINTK;
 
-/* If audit records are to be written to the netlink socket, audit_pid
- * contains the (non-zero) pid. */
+/*
+ * If audit records are to be written to the netlink socket, audit_pid
+ * contains the pid of the auditd process and audit_nlk_pid contains
+ * the pid to use to send netlink messages to that process.
+ */
 int            audit_pid;
+static int     audit_nlk_pid;
 
 /* If audit_rate_limit is non-zero, limit the rate of sending audit records
  * to that number per second.  This prevents DoS attacks, but results in
@@ -166,10 +170,13 @@ void audit_panic(const char *message)
        case AUDIT_FAIL_SILENT:
                break;
        case AUDIT_FAIL_PRINTK:
-               printk(KERN_ERR "audit: %s\n", message);
+               if (printk_ratelimit())
+                       printk(KERN_ERR "audit: %s\n", message);
                break;
        case AUDIT_FAIL_PANIC:
-               panic("audit: %s\n", message);
+               /* test audit_pid since printk is always losey, why bother? */
+               if (audit_pid)
+                       panic("audit: %s\n", message);
                break;
        }
 }
@@ -234,11 +241,13 @@ void audit_log_lost(const char *message)
        }
 
        if (print) {
-               printk(KERN_WARNING
-                      "audit: audit_lost=%d audit_rate_limit=%d audit_backlog_limit=%d\n",
-                      atomic_read(&audit_lost),
-                      audit_rate_limit,
-                      audit_backlog_limit);
+               if (printk_ratelimit())
+                       printk(KERN_WARNING
+                               "audit: audit_lost=%d audit_rate_limit=%d "
+                               "audit_backlog_limit=%d\n",
+                               atomic_read(&audit_lost),
+                               audit_rate_limit,
+                               audit_backlog_limit);
                audit_panic(message);
        }
 }
@@ -345,14 +354,19 @@ static int kauditd_thread(void *dummy)
                wake_up(&audit_backlog_wait);
                if (skb) {
                        if (audit_pid) {
-                               int err = netlink_unicast(audit_sock, skb, audit_pid, 0);
+                               int err = netlink_unicast(audit_sock, skb, audit_nlk_pid, 0);
                                if (err < 0) {
                                        BUG_ON(err != -ECONNREFUSED); /* Shoudn't happen */
                                        printk(KERN_ERR "audit: *NO* daemon at audit_pid=%d\n", audit_pid);
+                                       audit_log_lost("auditd dissapeared\n");
                                        audit_pid = 0;
                                }
                        } else {
-                               printk(KERN_NOTICE "%s\n", skb->data + NLMSG_SPACE(0));
+                               if (printk_ratelimit())
+                                       printk(KERN_NOTICE "%s\n", skb->data +
+                                               NLMSG_SPACE(0));
+                               else
+                                       audit_log_lost("printk limit exceeded\n");
                                kfree_skb(skb);
                        }
                } else {
@@ -616,6 +630,7 @@ static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
                                                        sid, 1);
 
                        audit_pid = new_pid;
+                       audit_nlk_pid = NETLINK_CB(skb).pid;
                }
                if (status_get->mask & AUDIT_STATUS_RATE_LIMIT)
                        err = audit_set_rate_limit(status_get->rate_limit,
@@ -1066,7 +1081,7 @@ struct audit_buffer *audit_log_start(struct audit_context *ctx, gfp_t gfp_mask,
                        remove_wait_queue(&audit_backlog_wait, &wait);
                        continue;
                }
-               if (audit_rate_check())
+               if (audit_rate_check() && printk_ratelimit())
                        printk(KERN_WARNING
                               "audit: audit_backlog=%d > "
                               "audit_backlog_limit=%d\n",
@@ -1151,6 +1166,7 @@ static void audit_log_vformat(struct audit_buffer *ab, const char *fmt,
                        goto out;
                len = vsnprintf(skb_tail_pointer(skb), avail, fmt, args2);
        }
+       va_end(args2);
        if (len > 0)
                skb_put(skb, len);
 out:
@@ -1253,8 +1269,8 @@ static void audit_log_n_string(struct audit_buffer *ab, size_t slen,
 
 /**
  * audit_string_contains_control - does a string need to be logged in hex
- * @string - string to be checked
- * @len - max length of the string to check
+ * @string: string to be checked
+ * @len: max length of the string to check
  */
 int audit_string_contains_control(const char *string, size_t len)
 {
@@ -1269,7 +1285,7 @@ int audit_string_contains_control(const char *string, size_t len)
 /**
  * audit_log_n_untrustedstring - log a string that may contain random characters
  * @ab: audit_buffer
- * @len: lenth of string (not including trailing null)
+ * @len: length of string (not including trailing null)
  * @string: string to be logged
  *
  * This code will escape a string that is passed to it if the string
@@ -1304,26 +1320,26 @@ void audit_log_untrustedstring(struct audit_buffer *ab, const char *string)
 
 /* This is a helper-function to print the escaped d_path */
 void audit_log_d_path(struct audit_buffer *ab, const char *prefix,
-                     struct dentry *dentry, struct vfsmount *vfsmnt)
+                     struct path *path)
 {
-       char *p, *path;
+       char *p, *pathname;
 
        if (prefix)
                audit_log_format(ab, " %s", prefix);
 
        /* We will allow 11 spaces for ' (deleted)' to be appended */
-       path = kmalloc(PATH_MAX+11, ab->gfp_mask);
-       if (!path) {
+       pathname = kmalloc(PATH_MAX+11, ab->gfp_mask);
+       if (!pathname) {
                audit_log_format(ab, "<no memory>");
                return;
        }
-       p = d_path(dentry, vfsmnt, path, PATH_MAX+11);
+       p = d_path(path, pathname, PATH_MAX+11);
        if (IS_ERR(p)) { /* Should never happen since we send PATH_MAX */
                /* FIXME: can we save some information here? */
                audit_log_format(ab, "<too long>");
        } else
                audit_log_untrustedstring(ab, p);
-       kfree(path);
+       kfree(pathname);
 }
 
 /**
@@ -1342,15 +1358,19 @@ void audit_log_end(struct audit_buffer *ab)
        if (!audit_rate_check()) {
                audit_log_lost("rate limit exceeded");
        } else {
+               struct nlmsghdr *nlh = nlmsg_hdr(ab->skb);
                if (audit_pid) {
-                       struct nlmsghdr *nlh = nlmsg_hdr(ab->skb);
                        nlh->nlmsg_len = ab->skb->len - NLMSG_SPACE(0);
                        skb_queue_tail(&audit_skb_queue, ab->skb);
                        ab->skb = NULL;
                        wake_up_interruptible(&kauditd_wait);
-               } else {
-                       struct nlmsghdr *nlh = nlmsg_hdr(ab->skb);
-                       printk(KERN_NOTICE "type=%d %s\n", nlh->nlmsg_type, ab->skb->data + NLMSG_SPACE(0));
+               } 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_buffer_free(ab);