diff options
Diffstat (limited to 'security/apparmor/include/policy.h')
| -rw-r--r-- | security/apparmor/include/policy.h | 218 |
1 files changed, 153 insertions, 65 deletions
diff --git a/security/apparmor/include/policy.h b/security/apparmor/include/policy.h index b25491a3046a..f2d4b6348cbc 100644 --- a/security/apparmor/include/policy.h +++ b/security/apparmor/include/policy.h @@ -29,8 +29,8 @@ #include "file.h" #include "resource.h" -extern const char *const profile_mode_names[]; -#define APPARMOR_NAMES_MAX_INDEX 3 +extern const char *const aa_profile_mode_names[]; +#define APPARMOR_MODE_NAMES_MAX_INDEX 4 #define PROFILE_MODE(_profile, _mode) \ ((aa_g_profile_mode == (_mode)) || \ @@ -42,6 +42,10 @@ extern const char *const profile_mode_names[]; #define PROFILE_IS_HAT(_profile) ((_profile)->flags & PFLAG_HAT) +#define PROFILE_INVALID(_profile) ((_profile)->flags & PFLAG_INVALID) + +#define on_list_rcu(X) (!list_empty(X) && (X)->prev != LIST_POISON2) + /* * FIXME: currently need a clean way to replace and remove profiles as a * set. It should be done at the namespace level. @@ -52,17 +56,19 @@ enum profile_mode { APPARMOR_ENFORCE, /* enforce access rules */ APPARMOR_COMPLAIN, /* allow and log access violations */ APPARMOR_KILL, /* kill task on access violation */ + APPARMOR_UNCONFINED, /* profile set to unconfined */ }; enum profile_flags { PFLAG_HAT = 1, /* profile is a hat */ - PFLAG_UNCONFINED = 2, /* profile is an unconfined profile */ PFLAG_NULL = 4, /* profile is null learning profile */ PFLAG_IX_ON_NAME_ERROR = 8, /* fallback to ix on name lookup fail */ PFLAG_IMMUTABLE = 0x10, /* don't allow changes/replacement */ PFLAG_USER_DEFINED = 0x20, /* user based profile - lower privs */ PFLAG_NO_LIST_REF = 0x40, /* list doesn't keep profile ref */ PFLAG_OLD_NULL_TRANS = 0x100, /* use // as the null transition */ + PFLAG_INVALID = 0x200, /* profile replaced/removed */ + PFLAG_NS_COUNT = 0x400, /* carries NS ref count */ /* These flags must correspond with PATH_flags */ PFLAG_MEDIATE_DELETED = 0x10000, /* mediate instead delegate deleted */ @@ -73,14 +79,12 @@ struct aa_profile; /* struct aa_policy - common part of both namespaces and profiles * @name: name of the object * @hname - The hierarchical name - * @count: reference count of the obj * @list: list policy object is on * @profiles: head of the profiles list contained in the object */ struct aa_policy { char *name; char *hname; - struct kref count; struct list_head list; struct list_head profiles; }; @@ -106,6 +110,8 @@ struct aa_ns_acct { * @unconfined: special unconfined profile for the namespace * @sub_ns: list of namespaces under the current namespace. * @uniq_null: uniq value used for null learning profiles + * @uniq_id: a unique id count for the profiles in the namespace + * @dents: dentries for the namespaces file entries in apparmorfs * * An aa_namespace defines the set profiles that are searched to determine * which profile to attach to a task. Profiles can not be shared between @@ -124,11 +130,14 @@ struct aa_ns_acct { struct aa_namespace { struct aa_policy base; struct aa_namespace *parent; - rwlock_t lock; + struct mutex lock; struct aa_ns_acct acct; struct aa_profile *unconfined; struct list_head sub_ns; atomic_t uniq_null; + long uniq_id; + + struct dentry *dents[AAFS_NS_SIZEOF]; }; /* struct aa_policydb - match engine for a policy @@ -142,12 +151,21 @@ struct aa_policydb { }; +struct aa_replacedby { + struct kref count; + struct aa_profile __rcu *profile; +}; + + /* struct aa_profile - basic confinement data * @base - base components of the profile (name, refcount, lists, lock ...) + * @count: reference count of the obj + * @rcu: rcu head used when removing from @list * @parent: parent of profile * @ns: namespace the profile is in * @replacedby: is set to the profile that replaced this profile * @rename: optional profile name that this profile renamed + * @attach: human readable attachment string * @xmatch: optional extended matching for unconfined executables names * @xmatch_len: xmatch prefix len, used to determine xmatch priority * @audit: the auditing mode of the profile @@ -160,13 +178,15 @@ struct aa_policydb { * @caps: capabilities for the profile * @rlimits: rlimits for the profile * + * @dents: dentries for the profiles file entries in apparmorfs + * @dirname: name of the profile dir in apparmorfs + * * The AppArmor profile contains the basic confinement data. Each profile * has a name, and exists in a namespace. The @name and @exec_match are * used to determine profile attachment against unconfined tasks. All other * attachments are determined by profile X transition rules. * - * The @replacedby field is write protected by the profile lock. Reads - * are assumed to be atomic, and are done without locking. + * The @replacedby struct is write protected by the profile lock. * * Profiles have a hierarchy where hats and children profiles keep * a reference to their parent. @@ -177,17 +197,20 @@ struct aa_policydb { */ struct aa_profile { struct aa_policy base; - struct aa_profile *parent; + struct kref count; + struct rcu_head rcu; + struct aa_profile __rcu *parent; struct aa_namespace *ns; - struct aa_profile *replacedby; + struct aa_replacedby *replacedby; const char *rename; + const char *attach; struct aa_dfa *xmatch; int xmatch_len; enum audit_mode audit; - enum profile_mode mode; - u32 flags; + long mode; + long flags; u32 path_flags; int size; @@ -195,6 +218,10 @@ struct aa_profile { struct aa_file_rules file; struct aa_caps caps; struct aa_rlimit rlimits; + + unsigned char *hash; + char *dirname; + struct dentry *dents[AAFS_PROF_SIZEOF]; }; extern struct aa_namespace *root_ns; @@ -211,43 +238,11 @@ void aa_free_namespace_kref(struct kref *kref); struct aa_namespace *aa_find_namespace(struct aa_namespace *root, const char *name); -static inline struct aa_policy *aa_get_common(struct aa_policy *c) -{ - if (c) - kref_get(&c->count); - - return c; -} - -/** - * aa_get_namespace - increment references count on @ns - * @ns: namespace to increment reference count of (MAYBE NULL) - * - * Returns: pointer to @ns, if @ns is NULL returns NULL - * Requires: @ns must be held with valid refcount when called - */ -static inline struct aa_namespace *aa_get_namespace(struct aa_namespace *ns) -{ - if (ns) - kref_get(&(ns->base.count)); - - return ns; -} - -/** - * aa_put_namespace - decrement refcount on @ns - * @ns: namespace to put reference of - * - * Decrement reference count of @ns and if no longer in use free it - */ -static inline void aa_put_namespace(struct aa_namespace *ns) -{ - if (ns) - kref_put(&ns->base.count, aa_free_namespace_kref); -} +void aa_free_replacedby_kref(struct kref *kref); struct aa_profile *aa_alloc_profile(const char *name); struct aa_profile *aa_new_null_profile(struct aa_profile *parent, int hat); +void aa_free_profile(struct aa_profile *profile); void aa_free_profile_kref(struct kref *kref); struct aa_profile *aa_find_child(struct aa_profile *parent, const char *name); struct aa_profile *aa_lookup_profile(struct aa_namespace *ns, const char *name); @@ -259,25 +254,13 @@ ssize_t aa_remove_profiles(char *name, size_t size); #define PROF_ADD 1 #define PROF_REPLACE 0 -#define unconfined(X) ((X)->flags & PFLAG_UNCONFINED) +#define unconfined(X) ((X)->mode == APPARMOR_UNCONFINED) -/** - * aa_newest_version - find the newest version of @profile - * @profile: the profile to check for newer versions of (NOT NULL) - * - * Returns: newest version of @profile, if @profile is the newest version - * return @profile. - * - * NOTE: the profile returned is not refcounted, The refcount on @profile - * must be held until the caller decides what to do with the returned newest - * version. - */ -static inline struct aa_profile *aa_newest_version(struct aa_profile *profile) -{ - while (profile->replacedby) - profile = profile->replacedby; - return profile; +static inline struct aa_profile *aa_deref_parent(struct aa_profile *p) +{ + return rcu_dereference_protected(p->parent, + mutex_is_locked(&p->ns->lock)); } /** @@ -290,19 +273,124 @@ static inline struct aa_profile *aa_newest_version(struct aa_profile *profile) static inline struct aa_profile *aa_get_profile(struct aa_profile *p) { if (p) - kref_get(&(p->base.count)); + kref_get(&(p->count)); return p; } /** + * aa_get_profile_not0 - increment refcount on profile @p found via lookup + * @p: profile (MAYBE NULL) + * + * Returns: pointer to @p if @p is NULL will return NULL + * Requires: @p must be held with valid refcount when called + */ +static inline struct aa_profile *aa_get_profile_not0(struct aa_profile *p) +{ + if (p && kref_get_not0(&p->count)) + return p; + + return NULL; +} + +/** + * aa_get_profile_rcu - increment a refcount profile that can be replaced + * @p: pointer to profile that can be replaced (NOT NULL) + * + * Returns: pointer to a refcounted profile. + * else NULL if no profile + */ +static inline struct aa_profile *aa_get_profile_rcu(struct aa_profile __rcu **p) +{ + struct aa_profile *c; + + rcu_read_lock(); + do { + c = rcu_dereference(*p); + } while (c && !kref_get_not0(&c->count)); + rcu_read_unlock(); + + return c; +} + +/** + * aa_get_newest_profile - find the newest version of @profile + * @profile: the profile to check for newer versions of + * + * Returns: refcounted newest version of @profile taking into account + * replacement, renames and removals + * return @profile. + */ +static inline struct aa_profile *aa_get_newest_profile(struct aa_profile *p) +{ + if (!p) + return NULL; + + if (PROFILE_INVALID(p)) + return aa_get_profile_rcu(&p->replacedby->profile); + + return aa_get_profile(p); +} + +/** * aa_put_profile - decrement refcount on profile @p * @p: profile (MAYBE NULL) */ static inline void aa_put_profile(struct aa_profile *p) { if (p) - kref_put(&p->base.count, aa_free_profile_kref); + kref_put(&p->count, aa_free_profile_kref); +} + +static inline struct aa_replacedby *aa_get_replacedby(struct aa_replacedby *p) +{ + if (p) + kref_get(&(p->count)); + + return p; +} + +static inline void aa_put_replacedby(struct aa_replacedby *p) +{ + if (p) + kref_put(&p->count, aa_free_replacedby_kref); +} + +/* requires profile list write lock held */ +static inline void __aa_update_replacedby(struct aa_profile *orig, + struct aa_profile *new) +{ + struct aa_profile *tmp = rcu_dereference(orig->replacedby->profile); + rcu_assign_pointer(orig->replacedby->profile, aa_get_profile(new)); + orig->flags |= PFLAG_INVALID; + aa_put_profile(tmp); +} + +/** + * aa_get_namespace - increment references count on @ns + * @ns: namespace to increment reference count of (MAYBE NULL) + * + * Returns: pointer to @ns, if @ns is NULL returns NULL + * Requires: @ns must be held with valid refcount when called + */ +static inline struct aa_namespace *aa_get_namespace(struct aa_namespace *ns) +{ + if (ns) + aa_get_profile(ns->unconfined); + + return ns; +} + +/** + * aa_put_namespace - decrement refcount on @ns + * @ns: namespace to put reference of + * + * Decrement reference count of @ns and if no longer in use free it + */ +static inline void aa_put_namespace(struct aa_namespace *ns) +{ + if (ns) + aa_put_profile(ns->unconfined); } static inline int AUDIT_MODE(struct aa_profile *profile) |