ARM: tegra: dvfs: Add GPU scaling trip-points interfaces
[linux-3.10.git] / kernel / auditfilter.c
index 903caa2..6bd4a90 100644 (file)
@@ -310,103 +310,83 @@ static u32 audit_to_op(u32 op)
        return n;
 }
 
-
-/* Translate struct audit_rule to kernel's rule respresentation.
- * Exists for backward compatibility with userspace. */
-static struct audit_entry *audit_rule_to_entry(struct audit_rule *rule)
+/* check if an audit field is valid */
+static int audit_field_valid(struct audit_entry *entry, struct audit_field *f)
 {
-       struct audit_entry *entry;
-       int err = 0;
-       int i;
-
-       entry = audit_to_entry_common(rule);
-       if (IS_ERR(entry))
-               goto exit_nofree;
-
-       for (i = 0; i < rule->field_count; i++) {
-               struct audit_field *f = &entry->rule.fields[i];
-               u32 n;
-
-               n = rule->fields[i] & (AUDIT_NEGATE|AUDIT_OPERATORS);
-
-               /* Support for legacy operators where
-                * AUDIT_NEGATE bit signifies != and otherwise assumes == */
-               if (n & AUDIT_NEGATE)
-                       f->op = Audit_not_equal;
-               else if (!n)
-                       f->op = Audit_equal;
-               else
-                       f->op = audit_to_op(n);
-
-               entry->rule.vers_ops = (n & AUDIT_OPERATORS) ? 2 : 1;
-
-               f->type = rule->fields[i] & ~(AUDIT_NEGATE|AUDIT_OPERATORS);
-               f->val = rule->values[i];
-
-               err = -EINVAL;
-               if (f->op == Audit_bad)
-                       goto exit_free;
-
-               switch(f->type) {
-               default:
-                       goto exit_free;
-               case AUDIT_PID:
-               case AUDIT_UID:
-               case AUDIT_EUID:
-               case AUDIT_SUID:
-               case AUDIT_FSUID:
-               case AUDIT_GID:
-               case AUDIT_EGID:
-               case AUDIT_SGID:
-               case AUDIT_FSGID:
-               case AUDIT_LOGINUID:
-               case AUDIT_PERS:
-               case AUDIT_MSGTYPE:
-               case AUDIT_PPID:
-               case AUDIT_DEVMAJOR:
-               case AUDIT_DEVMINOR:
-               case AUDIT_EXIT:
-               case AUDIT_SUCCESS:
-                       /* bit ops are only useful on syscall args */
-                       if (f->op == Audit_bitmask || f->op == Audit_bittest)
-                               goto exit_free;
-                       break;
-               case AUDIT_ARG0:
-               case AUDIT_ARG1:
-               case AUDIT_ARG2:
-               case AUDIT_ARG3:
-                       break;
-               /* arch is only allowed to be = or != */
-               case AUDIT_ARCH:
-                       if (f->op != Audit_not_equal && f->op != Audit_equal)
-                               goto exit_free;
-                       entry->rule.arch_f = f;
-                       break;
-               case AUDIT_PERM:
-                       if (f->val & ~15)
-                               goto exit_free;
-                       break;
-               case AUDIT_FILETYPE:
-                       if (f->val & ~S_IFMT)
-                               goto exit_free;
-                       break;
-               case AUDIT_INODE:
-                       err = audit_to_inode(&entry->rule, f);
-                       if (err)
-                               goto exit_free;
-                       break;
-               }
-       }
-
-       if (entry->rule.inode_f && entry->rule.inode_f->op == Audit_not_equal)
-               entry->rule.inode_f = NULL;
-
-exit_nofree:
-       return entry;
+       switch(f->type) {
+       case AUDIT_MSGTYPE:
+               if (entry->rule.listnr != AUDIT_FILTER_TYPE &&
+                   entry->rule.listnr != AUDIT_FILTER_USER)
+                       return -EINVAL;
+               break;
+       };
 
-exit_free:
-       audit_free_rule(entry);
-       return ERR_PTR(err);
+       switch(f->type) {
+       default:
+               return -EINVAL;
+       case AUDIT_UID:
+       case AUDIT_EUID:
+       case AUDIT_SUID:
+       case AUDIT_FSUID:
+       case AUDIT_LOGINUID:
+       case AUDIT_OBJ_UID:
+       case AUDIT_GID:
+       case AUDIT_EGID:
+       case AUDIT_SGID:
+       case AUDIT_FSGID:
+       case AUDIT_OBJ_GID:
+       case AUDIT_PID:
+       case AUDIT_PERS:
+       case AUDIT_MSGTYPE:
+       case AUDIT_PPID:
+       case AUDIT_DEVMAJOR:
+       case AUDIT_DEVMINOR:
+       case AUDIT_EXIT:
+       case AUDIT_SUCCESS:
+               /* bit ops are only useful on syscall args */
+               if (f->op == Audit_bitmask || f->op == Audit_bittest)
+                       return -EINVAL;
+               break;
+       case AUDIT_ARG0:
+       case AUDIT_ARG1:
+       case AUDIT_ARG2:
+       case AUDIT_ARG3:
+       case AUDIT_SUBJ_USER:
+       case AUDIT_SUBJ_ROLE:
+       case AUDIT_SUBJ_TYPE:
+       case AUDIT_SUBJ_SEN:
+       case AUDIT_SUBJ_CLR:
+       case AUDIT_OBJ_USER:
+       case AUDIT_OBJ_ROLE:
+       case AUDIT_OBJ_TYPE:
+       case AUDIT_OBJ_LEV_LOW:
+       case AUDIT_OBJ_LEV_HIGH:
+       case AUDIT_WATCH:
+       case AUDIT_DIR:
+       case AUDIT_FILTERKEY:
+               break;
+       case AUDIT_LOGINUID_SET:
+               if ((f->val != 0) && (f->val != 1))
+                       return -EINVAL;
+       /* FALL THROUGH */
+       case AUDIT_ARCH:
+               if (f->op != Audit_not_equal && f->op != Audit_equal)
+                       return -EINVAL;
+               break;
+       case AUDIT_PERM:
+               if (f->val & ~15)
+                       return -EINVAL;
+               break;
+       case AUDIT_FILETYPE:
+               if (f->val & ~S_IFMT)
+                       return -EINVAL;
+               break;
+       case AUDIT_FIELD_COMPARE:
+               if (f->val > AUDIT_MAX_FIELD_COMPARE)
+                       return -EINVAL;
+               break;
+       };
+       return 0;
 }
 
 /* Translate struct audit_rule_data to kernel's rule respresentation. */
@@ -437,30 +417,41 @@ static struct audit_entry *audit_data_to_entry(struct audit_rule_data *data,
 
                f->type = data->fields[i];
                f->val = data->values[i];
+               f->uid = INVALID_UID;
+               f->gid = INVALID_GID;
                f->lsm_str = NULL;
                f->lsm_rule = NULL;
-               switch(f->type) {
-               case AUDIT_PID:
+
+               /* Support legacy tests for a valid loginuid */
+               if ((f->type == AUDIT_LOGINUID) && (f->val == 4294967295)) {
+                       f->type = AUDIT_LOGINUID_SET;
+                       f->val = 0;
+               }
+
+               err = audit_field_valid(entry, f);
+               if (err)
+                       goto exit_free;
+
+               err = -EINVAL;
+               switch (f->type) {
+               case AUDIT_LOGINUID:
                case AUDIT_UID:
                case AUDIT_EUID:
                case AUDIT_SUID:
                case AUDIT_FSUID:
+               case AUDIT_OBJ_UID:
+                       f->uid = make_kuid(current_user_ns(), f->val);
+                       if (!uid_valid(f->uid))
+                               goto exit_free;
+                       break;
                case AUDIT_GID:
                case AUDIT_EGID:
                case AUDIT_SGID:
                case AUDIT_FSGID:
-               case AUDIT_LOGINUID:
-               case AUDIT_PERS:
-               case AUDIT_MSGTYPE:
-               case AUDIT_PPID:
-               case AUDIT_DEVMAJOR:
-               case AUDIT_DEVMINOR:
-               case AUDIT_EXIT:
-               case AUDIT_SUCCESS:
-               case AUDIT_ARG0:
-               case AUDIT_ARG1:
-               case AUDIT_ARG2:
-               case AUDIT_ARG3:
+               case AUDIT_OBJ_GID:
+                       f->gid = make_kgid(current_user_ns(), f->val);
+                       if (!gid_valid(f->gid))
+                               goto exit_free;
                        break;
                case AUDIT_ARCH:
                        entry->rule.arch_f = f;
@@ -524,7 +515,6 @@ static struct audit_entry *audit_data_to_entry(struct audit_rule_data *data,
                                goto exit_free;
                        break;
                case AUDIT_FILTERKEY:
-                       err = -EINVAL;
                        if (entry->rule.filterkey || f->val > AUDIT_MAX_KEY_LEN)
                                goto exit_free;
                        str = audit_unpack_string(&bufp, &remain, f->val);
@@ -533,16 +523,6 @@ static struct audit_entry *audit_data_to_entry(struct audit_rule_data *data,
                        entry->rule.buflen += f->val;
                        entry->rule.filterkey = str;
                        break;
-               case AUDIT_PERM:
-                       if (f->val & ~15)
-                               goto exit_free;
-                       break;
-               case AUDIT_FILETYPE:
-                       if (f->val & ~S_IFMT)
-                               goto exit_free;
-                       break;
-               default:
-                       goto exit_free;
                }
        }
 
@@ -553,6 +533,10 @@ exit_nofree:
        return entry;
 
 exit_free:
+       if (entry->rule.watch)
+               audit_put_watch(entry->rule.watch); /* matches initial get */
+       if (entry->rule.tree)
+               audit_put_tree(entry->rule.tree); /* that's the temporary one */
        audit_free_rule(entry);
        return ERR_PTR(err);
 }
@@ -568,36 +552,6 @@ static inline size_t audit_pack_string(void **bufp, const char *str)
        return len;
 }
 
-/* Translate kernel rule respresentation to struct audit_rule.
- * Exists for backward compatibility with userspace. */
-static struct audit_rule *audit_krule_to_rule(struct audit_krule *krule)
-{
-       struct audit_rule *rule;
-       int i;
-
-       rule = kzalloc(sizeof(*rule), GFP_KERNEL);
-       if (unlikely(!rule))
-               return NULL;
-
-       rule->flags = krule->flags | krule->listnr;
-       rule->action = krule->action;
-       rule->field_count = krule->field_count;
-       for (i = 0; i < rule->field_count; i++) {
-               rule->values[i] = krule->fields[i].val;
-               rule->fields[i] = krule->fields[i].type;
-
-               if (krule->vers_ops == 1) {
-                       if (krule->fields[i].op == Audit_not_equal)
-                               rule->fields[i] |= AUDIT_NEGATE;
-               } else {
-                       rule->fields[i] |= audit_ops[krule->fields[i].op];
-               }
-       }
-       for (i = 0; i < AUDIT_BITMASK_SIZE; i++) rule->mask[i] = krule->mask[i];
-
-       return rule;
-}
-
 /* Translate kernel rule respresentation to struct audit_rule_data. */
 static struct audit_rule_data *audit_krule_to_data(struct audit_krule *krule)
 {
@@ -702,6 +656,23 @@ static int audit_compare_rule(struct audit_krule *a, struct audit_krule *b)
                        if (strcmp(a->filterkey, b->filterkey))
                                return 1;
                        break;
+               case AUDIT_UID:
+               case AUDIT_EUID:
+               case AUDIT_SUID:
+               case AUDIT_FSUID:
+               case AUDIT_LOGINUID:
+               case AUDIT_OBJ_UID:
+                       if (!uid_eq(a->fields[i].uid, b->fields[i].uid))
+                               return 1;
+                       break;
+               case AUDIT_GID:
+               case AUDIT_EGID:
+               case AUDIT_SGID:
+               case AUDIT_FSGID:
+               case AUDIT_OBJ_GID:
+                       if (!gid_eq(a->fields[i].gid, b->fields[i].gid))
+                               return 1;
+                       break;
                default:
                        if (a->fields[i].val != b->fields[i].val)
                                return 1;
@@ -993,35 +964,6 @@ out:
        return ret;
 }
 
-/* List rules using struct audit_rule.  Exists for backward
- * compatibility with userspace. */
-static void audit_list(int pid, int seq, struct sk_buff_head *q)
-{
-       struct sk_buff *skb;
-       struct audit_krule *r;
-       int i;
-
-       /* This is a blocking read, so use audit_filter_mutex instead of rcu
-        * iterator to sync with list writers. */
-       for (i=0; i<AUDIT_NR_FILTERS; i++) {
-               list_for_each_entry(r, &audit_rules_list[i], list) {
-                       struct audit_rule *rule;
-
-                       rule = audit_krule_to_rule(r);
-                       if (unlikely(!rule))
-                               break;
-                       skb = audit_make_reply(pid, seq, AUDIT_LIST, 0, 1,
-                                        rule, sizeof(*rule));
-                       if (skb)
-                               skb_queue_tail(q, skb);
-                       kfree(rule);
-               }
-       }
-       skb = audit_make_reply(pid, seq, AUDIT_LIST, 1, 1, NULL, 0);
-       if (skb)
-               skb_queue_tail(q, skb);
-}
-
 /* List rules using struct audit_rule_data. */
 static void audit_list_rules(int pid, int seq, struct sk_buff_head *q)
 {
@@ -1051,11 +993,11 @@ static void audit_list_rules(int pid, int seq, struct sk_buff_head *q)
 }
 
 /* Log rule additions and removals */
-static void audit_log_rule_change(uid_t loginuid, u32 sessionid, u32 sid,
-                                 char *action, struct audit_krule *rule,
-                                 int res)
+static void audit_log_rule_change(char *action, struct audit_krule *rule, int res)
 {
        struct audit_buffer *ab;
+       uid_t loginuid = from_kuid(&init_user_ns, audit_get_loginuid(current));
+       u32 sessionid = audit_get_sessionid(current);
 
        if (!audit_enabled)
                return;
@@ -1063,17 +1005,8 @@ static void audit_log_rule_change(uid_t loginuid, u32 sessionid, u32 sid,
        ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_CONFIG_CHANGE);
        if (!ab)
                return;
-       audit_log_format(ab, "auid=%u ses=%u", loginuid, sessionid);
-       if (sid) {
-               char *ctx = NULL;
-               u32 len;
-               if (security_secid_to_secctx(sid, &ctx, &len))
-                       audit_log_format(ab, " ssid=%u", sid);
-               else {
-                       audit_log_format(ab, " subj=%s", ctx);
-                       security_release_secctx(ctx, len);
-               }
-       }
+       audit_log_format(ab, "auid=%u ses=%u" ,loginuid, sessionid);
+       audit_log_task_context(ab);
        audit_log_format(ab, " op=");
        audit_log_string(ab, action);
        audit_log_key(ab, rule->filterkey);
@@ -1085,16 +1018,11 @@ static void audit_log_rule_change(uid_t loginuid, u32 sessionid, u32 sid,
  * audit_receive_filter - apply all rules to the specified message type
  * @type: audit message type
  * @pid: target pid for netlink audit messages
- * @uid: target uid for netlink audit messages
  * @seq: netlink audit message sequence (serial) number
  * @data: payload data
  * @datasz: size of payload data
- * @loginuid: loginuid of sender
- * @sessionid: sessionid for netlink audit message
- * @sid: SE Linux Security ID of sender
  */
-int audit_receive_filter(int type, int pid, int uid, int seq, void *data,
-                        size_t datasz, uid_t loginuid, u32 sessionid, u32 sid)
+int audit_receive_filter(int type, int pid, int seq, void *data, size_t datasz)
 {
        struct task_struct *tsk;
        struct audit_netlink_list *dest;
@@ -1102,7 +1030,6 @@ int audit_receive_filter(int type, int pid, int uid, int seq, void *data,
        struct audit_entry *entry;
 
        switch (type) {
-       case AUDIT_LIST:
        case AUDIT_LIST_RULES:
                /* We can't just spew out the rules here because we might fill
                 * the available socket buffer space and deadlock waiting for
@@ -1117,10 +1044,7 @@ int audit_receive_filter(int type, int pid, int uid, int seq, void *data,
                skb_queue_head_init(&dest->q);
 
                mutex_lock(&audit_filter_mutex);
-               if (type == AUDIT_LIST)
-                       audit_list(pid, seq, &dest->q);
-               else
-                       audit_list_rules(pid, seq, &dest->q);
+               audit_list_rules(pid, seq, &dest->q);
                mutex_unlock(&audit_filter_mutex);
 
                tsk = kthread_run(audit_send_list, dest, "audit_send_list");
@@ -1130,35 +1054,23 @@ int audit_receive_filter(int type, int pid, int uid, int seq, void *data,
                        err = PTR_ERR(tsk);
                }
                break;
-       case AUDIT_ADD:
        case AUDIT_ADD_RULE:
-               if (type == AUDIT_ADD)
-                       entry = audit_rule_to_entry(data);
-               else
-                       entry = audit_data_to_entry(data, datasz);
+               entry = audit_data_to_entry(data, datasz);
                if (IS_ERR(entry))
                        return PTR_ERR(entry);
 
                err = audit_add_rule(entry);
-               audit_log_rule_change(loginuid, sessionid, sid, "add rule",
-                                     &entry->rule, !err);
-
+               audit_log_rule_change("add rule", &entry->rule, !err);
                if (err)
                        audit_free_rule(entry);
                break;
-       case AUDIT_DEL:
        case AUDIT_DEL_RULE:
-               if (type == AUDIT_DEL)
-                       entry = audit_rule_to_entry(data);
-               else
-                       entry = audit_data_to_entry(data, datasz);
+               entry = audit_data_to_entry(data, datasz);
                if (IS_ERR(entry))
                        return PTR_ERR(entry);
 
                err = audit_del_rule(entry);
-               audit_log_rule_change(loginuid, sessionid, sid, "remove rule",
-                                     &entry->rule, !err);
-
+               audit_log_rule_change("remove rule", &entry->rule, !err);
                audit_free_rule(entry);
                break;
        default:
@@ -1193,46 +1105,110 @@ int audit_comparator(u32 left, u32 op, u32 right)
        }
 }
 
-/* Compare given dentry name with last component in given path,
- * return of 0 indicates a match. */
-int audit_compare_dname_path(const char *dname, const char *path,
-                            int *dirlen)
+int audit_uid_comparator(kuid_t left, u32 op, kuid_t right)
 {
-       int dlen, plen;
-       const char *p;
+       switch (op) {
+       case Audit_equal:
+               return uid_eq(left, right);
+       case Audit_not_equal:
+               return !uid_eq(left, right);
+       case Audit_lt:
+               return uid_lt(left, right);
+       case Audit_le:
+               return uid_lte(left, right);
+       case Audit_gt:
+               return uid_gt(left, right);
+       case Audit_ge:
+               return uid_gte(left, right);
+       case Audit_bitmask:
+       case Audit_bittest:
+       default:
+               BUG();
+               return 0;
+       }
+}
 
-       if (!dname || !path)
-               return 1;
+int audit_gid_comparator(kgid_t left, u32 op, kgid_t right)
+{
+       switch (op) {
+       case Audit_equal:
+               return gid_eq(left, right);
+       case Audit_not_equal:
+               return !gid_eq(left, right);
+       case Audit_lt:
+               return gid_lt(left, right);
+       case Audit_le:
+               return gid_lte(left, right);
+       case Audit_gt:
+               return gid_gt(left, right);
+       case Audit_ge:
+               return gid_gte(left, right);
+       case Audit_bitmask:
+       case Audit_bittest:
+       default:
+               BUG();
+               return 0;
+       }
+}
+
+/**
+ * parent_len - find the length of the parent portion of a pathname
+ * @path: pathname of which to determine length
+ */
+int parent_len(const char *path)
+{
+       int plen;
+       const char *p;
 
-       dlen = strlen(dname);
        plen = strlen(path);
-       if (plen < dlen)
-               return 1;
+
+       if (plen == 0)
+               return plen;
 
        /* disregard trailing slashes */
        p = path + plen - 1;
        while ((*p == '/') && (p > path))
                p--;
 
-       /* find last path component */
-       p = p - dlen + 1;
-       if (p < path)
+       /* walk backward until we find the next slash or hit beginning */
+       while ((*p != '/') && (p > path))
+               p--;
+
+       /* did we find a slash? Then increment to include it in path */
+       if (*p == '/')
+               p++;
+
+       return p - path;
+}
+
+/**
+ * audit_compare_dname_path - compare given dentry name with last component in
+ *                           given path. Return of 0 indicates a match.
+ * @dname:     dentry name that we're comparing
+ * @path:      full pathname that we're comparing
+ * @parentlen: length of the parent if known. Passing in AUDIT_NAME_FULL
+ *             here indicates that we must compute this value.
+ */
+int audit_compare_dname_path(const char *dname, const char *path, int parentlen)
+{
+       int dlen, pathlen;
+       const char *p;
+
+       dlen = strlen(dname);
+       pathlen = strlen(path);
+       if (pathlen < dlen)
                return 1;
-       else if (p > path) {
-               if (*--p != '/')
-                       return 1;
-               else
-                       p++;
-       }
 
-       /* return length of path's directory component */
-       if (dirlen)
-               *dirlen = p - path;
+       parentlen = parentlen == AUDIT_NAME_FULL ? parent_len(path) : parentlen;
+       if (pathlen - parentlen != dlen)
+               return 1;
+
+       p = path + parentlen;
+
        return strncmp(p, dname, dlen);
 }
 
-static int audit_filter_user_rules(struct netlink_skb_parms *cb,
-                                  struct audit_krule *rule,
+static int audit_filter_user_rules(struct audit_krule *rule, int type,
                                   enum audit_state *state)
 {
        int i;
@@ -1244,18 +1220,25 @@ static int audit_filter_user_rules(struct netlink_skb_parms *cb,
 
                switch (f->type) {
                case AUDIT_PID:
-                       result = audit_comparator(cb->creds.pid, f->op, f->val);
+                       result = audit_comparator(task_pid_vnr(current), f->op, f->val);
                        break;
                case AUDIT_UID:
-                       result = audit_comparator(cb->creds.uid, f->op, f->val);
+                       result = audit_uid_comparator(current_uid(), f->op, f->uid);
                        break;
                case AUDIT_GID:
-                       result = audit_comparator(cb->creds.gid, f->op, f->val);
+                       result = audit_gid_comparator(current_gid(), f->op, f->gid);
                        break;
                case AUDIT_LOGINUID:
-                       result = audit_comparator(audit_get_loginuid(current),
+                       result = audit_uid_comparator(audit_get_loginuid(current),
+                                                 f->op, f->uid);
+                       break;
+               case AUDIT_LOGINUID_SET:
+                       result = audit_comparator(audit_loginuid_set(current),
                                                  f->op, f->val);
                        break;
+               case AUDIT_MSGTYPE:
+                       result = audit_comparator(type, f->op, f->val);
+                       break;
                case AUDIT_SUBJ_USER:
                case AUDIT_SUBJ_ROLE:
                case AUDIT_SUBJ_TYPE:
@@ -1282,7 +1265,7 @@ static int audit_filter_user_rules(struct netlink_skb_parms *cb,
        return 1;
 }
 
-int audit_filter_user(struct netlink_skb_parms *cb)
+int audit_filter_user(int type)
 {
        enum audit_state state = AUDIT_DISABLED;
        struct audit_entry *e;
@@ -1290,7 +1273,7 @@ int audit_filter_user(struct netlink_skb_parms *cb)
 
        rcu_read_lock();
        list_for_each_entry_rcu(e, &audit_filter_list[AUDIT_FILTER_USER], list) {
-               if (audit_filter_user_rules(cb, &e->rule, &state)) {
+               if (audit_filter_user_rules(&e->rule, type, &state)) {
                        if (state == AUDIT_DISABLED)
                                ret = 0;
                        break;