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authorJohn Johansen <john.johansen@canonical.com>2017-01-16 00:42:14 -0800
committerJohn Johansen <john.johansen@canonical.com>2017-01-16 00:42:14 -0800
commitfe6bb31f590c9cd9c8d3ddbdfd4301f72db91718 (patch)
tree4eaff814d96fe99a94b7d7a75b4d857453eeec07 /security
parent12557dcba21b015f470076da6947e68bc70fff64 (diff)
downloadlinux-fe6bb31f590c9cd9c8d3ddbdfd4301f72db91718.tar.bz2
apparmor: split out shared policy_XXX fns to lib
Signed-off-by: John Johansen <john.johansen@canonical.com>
Diffstat (limited to 'security')
-rw-r--r--security/apparmor/include/lib.h81
-rw-r--r--security/apparmor/include/policy.h13
-rw-r--r--security/apparmor/lib.c52
-rw-r--r--security/apparmor/policy.c123
4 files changed, 137 insertions, 132 deletions
diff --git a/security/apparmor/include/lib.h b/security/apparmor/include/lib.h
index 71fd6d28a651..74cc68ea4c12 100644
--- a/security/apparmor/include/lib.h
+++ b/security/apparmor/include/lib.h
@@ -91,4 +91,85 @@ static inline bool mediated_filesystem(struct dentry *dentry)
return !(dentry->d_sb->s_flags & MS_NOUSER);
}
+/* struct aa_policy - common part of both namespaces and profiles
+ * @name: name of the object
+ * @hname - The hierarchical name
+ * @list: list policy object is on
+ * @profiles: head of the profiles list contained in the object
+ */
+struct aa_policy {
+ char *name;
+ char *hname;
+ struct list_head list;
+ struct list_head profiles;
+};
+
+/**
+ * hname_tail - find the last component of an hname
+ * @name: hname to find the base profile name component of (NOT NULL)
+ *
+ * Returns: the tail (base profile name) name component of an hname
+ */
+static inline const char *hname_tail(const char *hname)
+{
+ char *split;
+
+ hname = strim((char *)hname);
+ for (split = strstr(hname, "//"); split; split = strstr(hname, "//"))
+ hname = split + 2;
+
+ return hname;
+}
+
+/**
+ * __policy_find - find a policy by @name on a policy list
+ * @head: list to search (NOT NULL)
+ * @name: name to search for (NOT NULL)
+ *
+ * Requires: rcu_read_lock be held
+ *
+ * Returns: unrefcounted policy that match @name or NULL if not found
+ */
+static inline struct aa_policy *__policy_find(struct list_head *head,
+ const char *name)
+{
+ struct aa_policy *policy;
+
+ list_for_each_entry_rcu(policy, head, list) {
+ if (!strcmp(policy->name, name))
+ return policy;
+ }
+ return NULL;
+}
+
+/**
+ * __policy_strn_find - find a policy that's name matches @len chars of @str
+ * @head: list to search (NOT NULL)
+ * @str: string to search for (NOT NULL)
+ * @len: length of match required
+ *
+ * Requires: rcu_read_lock be held
+ *
+ * Returns: unrefcounted policy that match @str or NULL if not found
+ *
+ * if @len == strlen(@strlen) then this is equiv to __policy_find
+ * other wise it allows searching for policy by a partial match of name
+ */
+static inline struct aa_policy *__policy_strn_find(struct list_head *head,
+ const char *str, int len)
+{
+ struct aa_policy *policy;
+
+ list_for_each_entry_rcu(policy, head, list) {
+ if (aa_strneq(policy->name, str, len))
+ return policy;
+ }
+
+ return NULL;
+}
+
+bool aa_policy_init(struct aa_policy *policy, const char *prefix,
+ const char *name);
+void aa_policy_destroy(struct aa_policy *policy);
+
#endif /* AA_LIB_H */
diff --git a/security/apparmor/include/policy.h b/security/apparmor/include/policy.h
index 190fe37ecff0..9b199678a11c 100644
--- a/security/apparmor/include/policy.h
+++ b/security/apparmor/include/policy.h
@@ -77,19 +77,6 @@ enum profile_flags {
struct aa_profile;
-/* struct aa_policy - common part of both namespaces and profiles
- * @name: name of the object
- * @hname - The hierarchical name
- * @list: list policy object is on
- * @profiles: head of the profiles list contained in the object
- */
-struct aa_policy {
- char *name;
- char *hname;
- struct list_head list;
- struct list_head profiles;
-};
-
/* struct aa_ns_acct - accounting of profiles in namespace
* @max_size: maximum space allowed for all profiles in namespace
* @max_count: maximum number of profiles that can be in this namespace
diff --git a/security/apparmor/lib.c b/security/apparmor/lib.c
index 6028ffc008ae..e29ccdb0309a 100644
--- a/security/apparmor/lib.c
+++ b/security/apparmor/lib.c
@@ -20,6 +20,7 @@
#include "include/audit.h"
#include "include/apparmor.h"
#include "include/lib.h"
+#include "include/policy.h"
/**
* aa_split_fqname - split a fqname into a profile and namespace name
@@ -105,3 +106,54 @@ void *__aa_kvmalloc(size_t size, gfp_t flags)
}
return buffer;
}
+
+/**
+ * aa_policy_init - initialize a policy structure
+ * @policy: policy to initialize (NOT NULL)
+ * @prefix: prefix name if any is required. (MAYBE NULL)
+ * @name: name of the policy, init will make a copy of it (NOT NULL)
+ *
+ * Note: this fn creates a copy of strings passed in
+ *
+ * Returns: true if policy init successful
+ */
+bool aa_policy_init(struct aa_policy *policy, const char *prefix,
+ const char *name)
+{
+ /* freed by policy_free */
+ if (prefix) {
+ policy->hname = kmalloc(strlen(prefix) + strlen(name) + 3,
+ GFP_KERNEL);
+ if (policy->hname)
+ sprintf(policy->hname, "%s//%s", prefix, name);
+ } else
+ policy->hname = kstrdup(name, GFP_KERNEL);
+ if (!policy->hname)
+ return 0;
+ /* base.name is a substring of fqname */
+ policy->name = (char *)hname_tail(policy->hname);
+ INIT_LIST_HEAD(&policy->list);
+ INIT_LIST_HEAD(&policy->profiles);
+
+ return 1;
+}
+
+/**
+ * aa_policy_destroy - free the elements referenced by @policy
+ * @policy: policy that is to have its elements freed (NOT NULL)
+ */
+void aa_policy_destroy(struct aa_policy *policy)
+{
+ /* still contains profiles -- invalid */
+ if (on_list_rcu(&policy->profiles)) {
+ AA_ERROR("%s: internal error, policy '%s' contains profiles\n",
+ __func__, policy->name);
+ }
+ if (on_list_rcu(&policy->list)) {
+ AA_ERROR("%s: internal error, policy '%s' still on list\n",
+ __func__, policy->name);
+ }
+
+ /* don't free name as its a subset of hname */
+ kzfree(policy->hname);
+}
diff --git a/security/apparmor/policy.c b/security/apparmor/policy.c
index 179e68d7dc5f..a331149a4587 100644
--- a/security/apparmor/policy.c
+++ b/security/apparmor/policy.c
@@ -99,121 +99,6 @@ const char *const aa_profile_mode_names[] = {
"unconfined",
};
-/**
- * hname_tail - find the last component of an hname
- * @name: hname to find the base profile name component of (NOT NULL)
- *
- * Returns: the tail (base profile name) name component of an hname
- */
-static const char *hname_tail(const char *hname)
-{
- char *split;
- hname = strim((char *)hname);
- for (split = strstr(hname, "//"); split; split = strstr(hname, "//"))
- hname = split + 2;
-
- return hname;
-}
-
-/**
- * policy_init - initialize a policy structure
- * @policy: policy to initialize (NOT NULL)
- * @prefix: prefix name if any is required. (MAYBE NULL)
- * @name: name of the policy, init will make a copy of it (NOT NULL)
- *
- * Note: this fn creates a copy of strings passed in
- *
- * Returns: true if policy init successful
- */
-static bool policy_init(struct aa_policy *policy, const char *prefix,
- const char *name)
-{
- /* freed by policy_free */
- if (prefix) {
- policy->hname = kmalloc(strlen(prefix) + strlen(name) + 3,
- GFP_KERNEL);
- if (policy->hname)
- sprintf(policy->hname, "%s//%s", prefix, name);
- } else
- policy->hname = kstrdup(name, GFP_KERNEL);
- if (!policy->hname)
- return 0;
- /* base.name is a substring of fqname */
- policy->name = (char *)hname_tail(policy->hname);
- INIT_LIST_HEAD(&policy->list);
- INIT_LIST_HEAD(&policy->profiles);
-
- return 1;
-}
-
-/**
- * policy_destroy - free the elements referenced by @policy
- * @policy: policy that is to have its elements freed (NOT NULL)
- */
-static void policy_destroy(struct aa_policy *policy)
-{
- /* still contains profiles -- invalid */
- if (on_list_rcu(&policy->profiles)) {
- AA_ERROR("%s: internal error, "
- "policy '%s' still contains profiles\n",
- __func__, policy->name);
- BUG();
- }
- if (on_list_rcu(&policy->list)) {
- AA_ERROR("%s: internal error, policy '%s' still on list\n",
- __func__, policy->name);
- BUG();
- }
-
- /* don't free name as its a subset of hname */
- kzfree(policy->hname);
-}
-
-/**
- * __policy_find - find a policy by @name on a policy list
- * @head: list to search (NOT NULL)
- * @name: name to search for (NOT NULL)
- *
- * Requires: rcu_read_lock be held
- *
- * Returns: unrefcounted policy that match @name or NULL if not found
- */
-static struct aa_policy *__policy_find(struct list_head *head, const char *name)
-{
- struct aa_policy *policy;
-
- list_for_each_entry_rcu(policy, head, list) {
- if (!strcmp(policy->name, name))
- return policy;
- }
- return NULL;
-}
-
-/**
- * __policy_strn_find - find a policy that's name matches @len chars of @str
- * @head: list to search (NOT NULL)
- * @str: string to search for (NOT NULL)
- * @len: length of match required
- *
- * Requires: rcu_read_lock be held
- *
- * Returns: unrefcounted policy that match @str or NULL if not found
- *
- * if @len == strlen(@strlen) then this is equiv to __policy_find
- * other wise it allows searching for policy by a partial match of name
- */
-static struct aa_policy *__policy_strn_find(struct list_head *head,
- const char *str, int len)
-{
- struct aa_policy *policy;
-
- list_for_each_entry_rcu(policy, head, list) {
- if (aa_strneq(policy->name, str, len))
- return policy;
- }
-
- return NULL;
-}
/*
* Routines for AppArmor namespaces
@@ -280,7 +165,7 @@ static struct aa_namespace *alloc_namespace(const char *prefix,
AA_DEBUG("%s(%p)\n", __func__, ns);
if (!ns)
return NULL;
- if (!policy_init(&ns->base, prefix, name))
+ if (!aa_policy_init(&ns->base, prefix, name))
goto fail_ns;
INIT_LIST_HEAD(&ns->sub_ns);
@@ -321,7 +206,7 @@ static void free_namespace(struct aa_namespace *ns)
if (!ns)
return;
- policy_destroy(&ns->base);
+ aa_policy_destroy(&ns->base);
aa_put_namespace(ns->parent);
ns->unconfined->ns = NULL;
@@ -595,7 +480,7 @@ void aa_free_profile(struct aa_profile *profile)
return;
/* free children profiles */
- policy_destroy(&profile->base);
+ aa_policy_destroy(&profile->base);
aa_put_profile(rcu_access_pointer(profile->parent));
aa_put_namespace(profile->ns);
@@ -657,7 +542,7 @@ struct aa_profile *aa_alloc_profile(const char *hname)
goto fail;
kref_init(&profile->replacedby->count);
- if (!policy_init(&profile->base, NULL, hname))
+ if (!aa_policy_init(&profile->base, NULL, hname))
goto fail;
kref_init(&profile->count);