Merge master.kernel.org:/home/rmk/linux-2.6-serial

[linux-2.6] / kernel / auditfilter.c

diff --git a/kernel/auditfilter.c b/kernel/auditfilter.c
index 7f2ea8b84a2723ca92ba90b1bb8abfab7f731960..6a9a5c5a4e7db9f03cb175e5448cf9a3bf209dc7 100644 (file)
--- a/kernel/auditfilter.c
+++ b/kernel/auditfilter.c
@@ -279,6 +279,29 @@ static int audit_to_watch(struct audit_krule *krule, char *path, int len,
        return 0;
 }
 
+static __u32 *classes[AUDIT_SYSCALL_CLASSES];
+
+int __init audit_register_class(int class, unsigned *list)
+{
+       __u32 *p = kzalloc(AUDIT_BITMASK_SIZE * sizeof(__u32), GFP_KERNEL);
+       if (!p)
+               return -ENOMEM;
+       while (*list != ~0U) {
+               unsigned n = *list++;
+               if (n >= AUDIT_BITMASK_SIZE * 32 - AUDIT_SYSCALL_CLASSES) {
+                       kfree(p);
+                       return -EINVAL;
+               }
+               p[AUDIT_WORD(n)] |= AUDIT_BIT(n);
+       }
+       if (class >= AUDIT_SYSCALL_CLASSES || classes[class]) {
+               kfree(p);
+               return -EINVAL;
+       }
+       classes[class] = p;
+       return 0;
+}
+
 /* Common user-space to kernel rule translation. */
 static inline struct audit_entry *audit_to_entry_common(struct audit_rule *rule)
 {
@@ -322,6 +345,22 @@ static inline struct audit_entry *audit_to_entry_common(struct audit_rule *rule)
        for (i = 0; i < AUDIT_BITMASK_SIZE; i++)
                entry->rule.mask[i] = rule->mask[i];
 
+       for (i = 0; i < AUDIT_SYSCALL_CLASSES; i++) {
+               int bit = AUDIT_BITMASK_SIZE * 32 - i - 1;
+               __u32 *p = &entry->rule.mask[AUDIT_WORD(bit)];
+               __u32 *class;
+
+               if (!(*p & AUDIT_BIT(bit)))
+                       continue;
+               *p &= ~AUDIT_BIT(bit);
+               class = classes[i];
+               if (class) {
+                       int j;
+                       for (j = 0; j < AUDIT_BITMASK_SIZE; j++)
+                               entry->rule.mask[j] |= class[j];
+               }
+       }
+
        return entry;
 
 exit_err:
@@ -403,6 +442,7 @@ static struct audit_entry *audit_rule_to_entry(struct audit_rule *rule)
                case AUDIT_EQUAL:
                        break;
                default:
+                       err = -EINVAL;
                        goto exit_free;
                }
        }
@@ -540,6 +580,7 @@ static struct audit_entry *audit_data_to_entry(struct audit_rule_data *data,
                case AUDIT_EQUAL:
                        break;
                default:
+                       err = -EINVAL;
                        goto exit_free;
                }
        }
@@ -1095,6 +1136,14 @@ static inline int audit_add_rule(struct audit_entry *entry,
        struct audit_watch *watch = entry->rule.watch;
        struct nameidata *ndp, *ndw;
        int h, err, putnd_needed = 0;
+#ifdef CONFIG_AUDITSYSCALL
+       int dont_count = 0;
+
+       /* If either of these, don't count towards total */
+       if (entry->rule.listnr == AUDIT_FILTER_USER ||
+               entry->rule.listnr == AUDIT_FILTER_TYPE)
+               dont_count = 1;
+#endif
 
        if (inode_f) {
                h = audit_hash_ino(inode_f->val);
@@ -1135,6 +1184,10 @@ static inline int audit_add_rule(struct audit_entry *entry,
        } else {
                list_add_tail_rcu(&entry->list, list);
        }
+#ifdef CONFIG_AUDITSYSCALL
+       if (!dont_count)
+               audit_n_rules++;
+#endif
        mutex_unlock(&audit_filter_mutex);
 
        if (putnd_needed)
@@ -1159,6 +1212,14 @@ static inline int audit_del_rule(struct audit_entry *entry,
        struct audit_watch *watch, *tmp_watch = entry->rule.watch;
        LIST_HEAD(inotify_list);
        int h, ret = 0;
+#ifdef CONFIG_AUDITSYSCALL
+       int dont_count = 0;
+
+       /* If either of these, don't count towards total */
+       if (entry->rule.listnr == AUDIT_FILTER_USER ||
+               entry->rule.listnr == AUDIT_FILTER_TYPE)
+               dont_count = 1;
+#endif
 
        if (inode_f) {
                h = audit_hash_ino(inode_f->val);
@@ -1196,6 +1257,10 @@ static inline int audit_del_rule(struct audit_entry *entry,
        list_del_rcu(&e->list);
        call_rcu(&e->rcu, audit_free_rule_rcu);
 
+#ifdef CONFIG_AUDITSYSCALL
+       if (!dont_count)
+               audit_n_rules--;
+#endif
        mutex_unlock(&audit_filter_mutex);
 
        if (!list_empty(&inotify_list))