/* * AppArmor security module * * This file contains AppArmor policy manipulation functions * * Copyright (C) 1998-2008 Novell/SUSE * Copyright 2009-2010 Canonical Ltd. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License as * published by the Free Software Foundation, version 2 of the * License. * * * AppArmor policy is based around profiles, which contain the rules a * task is confined by. Every task in the system has a profile attached * to it determined either by matching "unconfined" tasks against the * visible set of profiles or by following a profiles attachment rules. * * Each profile exists in a profile namespace which is a container of * visible profiles. Each namespace contains a special "unconfined" profile, * which doesn't enforce any confinement on a task beyond DAC. * * Namespace and profile names can be written together in either * of two syntaxes. * :namespace:profile - used by kernel interfaces for easy detection * namespace://profile - used by policy * * Profile names can not start with : or @ or ^ and may not contain \0 * * Reserved profile names * unconfined - special automatically generated unconfined profile * inherit - special name to indicate profile inheritance * null-XXXX-YYYY - special automatically generated learning profiles * * Namespace names may not start with / or @ and may not contain \0 or : * Reserved namespace names * user-XXXX - user defined profiles * * a // in a profile or namespace name indicates a hierarchical name with the * name before the // being the parent and the name after the child. * * Profile and namespace hierarchies serve two different but similar purposes. * The namespace contains the set of visible profiles that are considered * for attachment. The hierarchy of namespaces allows for virtualizing * the namespace so that for example a chroot can have its own set of profiles * which may define some local user namespaces. * The profile hierarchy severs two distinct purposes, * - it allows for sub profiles or hats, which allows an application to run * subprograms under its own profile with different restriction than it * self, and not have it use the system profile. * eg. if a mail program starts an editor, the policy might make the * restrictions tighter on the editor tighter than the mail program, * and definitely different than general editor restrictions * - it allows for binary hierarchy of profiles, so that execution history * is preserved. This feature isn't exploited by AppArmor reference policy * but is allowed. NOTE: this is currently suboptimal because profile * aliasing is not currently implemented so that a profile for each * level must be defined. * eg. /bin/bash///bin/ls as a name would indicate /bin/ls was started * from /bin/bash * * A profile or namespace name that can contain one or more // separators * is referred to as an hname (hierarchical). * eg. /bin/bash//bin/ls * * An fqname is a name that may contain both namespace and profile hnames. * eg. :ns:/bin/bash//bin/ls * * NOTES: * - locking of profile lists is currently fairly coarse. All profile * lists within a namespace use the namespace lock. * FIXME: move profile lists to using rcu_lists */ #include #include #include #include #include "include/apparmor.h" #include "include/capability.h" #include "include/context.h" #include "include/file.h" #include "include/ipc.h" #include "include/match.h" #include "include/path.h" #include "include/policy.h" #include "include/policy_ns.h" #include "include/policy_unpack.h" #include "include/resource.h" int unprivileged_userns_apparmor_policy = 1; const char *const aa_profile_mode_names[] = { "enforce", "complain", "kill", "unconfined", }; /* requires profile list write lock held */ void __aa_update_proxy(struct aa_profile *orig, struct aa_profile *new) { struct aa_profile *tmp; tmp = rcu_dereference_protected(orig->proxy->profile, mutex_is_locked(&orig->ns->lock)); rcu_assign_pointer(orig->proxy->profile, aa_get_profile(new)); orig->flags |= PFLAG_STALE; aa_put_profile(tmp); } /** * __list_add_profile - add a profile to a list * @list: list to add it to (NOT NULL) * @profile: the profile to add (NOT NULL) * * refcount @profile, should be put by __list_remove_profile * * Requires: namespace lock be held, or list not be shared */ static void __list_add_profile(struct list_head *list, struct aa_profile *profile) { list_add_rcu(&profile->base.list, list); /* get list reference */ aa_get_profile(profile); } /** * __list_remove_profile - remove a profile from the list it is on * @profile: the profile to remove (NOT NULL) * * remove a profile from the list, warning generally removal should * be done with __replace_profile as most profile removals are * replacements to the unconfined profile. * * put @profile list refcount * * Requires: namespace lock be held, or list not have been live */ static void __list_remove_profile(struct aa_profile *profile) { list_del_rcu(&profile->base.list); aa_put_profile(profile); } /** * __remove_profile - remove old profile, and children * @profile: profile to be replaced (NOT NULL) * * Requires: namespace list lock be held, or list not be shared */ static void __remove_profile(struct aa_profile *profile) { /* release any children lists first */ __aa_profile_list_release(&profile->base.profiles); /* released by free_profile */ __aa_update_proxy(profile, profile->ns->unconfined); __aa_fs_profile_rmdir(profile); __list_remove_profile(profile); } /** * __aa_profile_list_release - remove all profiles on the list and put refs * @head: list of profiles (NOT NULL) * * Requires: namespace lock be held */ void __aa_profile_list_release(struct list_head *head) { struct aa_profile *profile, *tmp; list_for_each_entry_safe(profile, tmp, head, base.list) __remove_profile(profile); } static void free_proxy(struct aa_proxy *p) { if (p) { /* r->profile will not be updated any more as r is dead */ aa_put_profile(rcu_dereference_protected(p->profile, true)); kzfree(p); } } void aa_free_proxy_kref(struct kref *kref) { struct aa_proxy *p = container_of(kref, struct aa_proxy, count); free_proxy(p); } /** * aa_free_profile - free a profile * @profile: the profile to free (MAYBE NULL) * * Free a profile, its hats and null_profile. All references to the profile, * its hats and null_profile must have been put. * * If the profile was referenced from a task context, free_profile() will * be called from an rcu callback routine, so we must not sleep here. */ void aa_free_profile(struct aa_profile *profile) { AA_DEBUG("%s(%p)\n", __func__, profile); if (!profile) return; /* free children profiles */ aa_policy_destroy(&profile->base); aa_put_profile(rcu_access_pointer(profile->parent)); aa_put_ns(profile->ns); kzfree(profile->rename); aa_free_file_rules(&profile->file); aa_free_cap_rules(&profile->caps); aa_free_rlimit_rules(&profile->rlimits); kzfree(profile->dirname); aa_put_dfa(profile->xmatch); aa_put_dfa(profile->policy.dfa); aa_put_proxy(profile->proxy); kzfree(profile->hash); aa_put_loaddata(profile->rawdata); kzfree(profile); } /** * aa_free_profile_rcu - free aa_profile by rcu (called by aa_free_profile_kref) * @head: rcu_head callback for freeing of a profile (NOT NULL) */ static void aa_free_profile_rcu(struct rcu_head *head) { struct aa_profile *p = container_of(head, struct aa_profile, rcu); if (p->flags & PFLAG_NS_COUNT) aa_free_ns(p->ns); else aa_free_profile(p); } /** * aa_free_profile_kref - free aa_profile by kref (called by aa_put_profile) * @kr: kref callback for freeing of a profile (NOT NULL) */ void aa_free_profile_kref(struct kref *kref) { struct aa_profile *p = container_of(kref, struct aa_profile, count); call_rcu(&p->rcu, aa_free_profile_rcu); } /** * aa_alloc_profile - allocate, initialize and return a new profile * @hname: name of the profile (NOT NULL) * @gfp: allocation type * * Returns: refcount profile or NULL on failure */ struct aa_profile *aa_alloc_profile(const char *hname, gfp_t gfp) { struct aa_profile *profile; /* freed by free_profile - usually through aa_put_profile */ profile = kzalloc(sizeof(*profile), gfp); if (!profile) return NULL; profile->proxy = kzalloc(sizeof(struct aa_proxy), gfp); if (!profile->proxy) goto fail; kref_init(&profile->proxy->count); if (!aa_policy_init(&profile->base, NULL, hname, gfp)) goto fail; kref_init(&profile->count); /* refcount released by caller */ return profile; fail: kzfree(profile->proxy); kzfree(profile); return NULL; } /** * aa_new_null_profile - create or find a null-X learning profile * @parent: profile that caused this profile to be created (NOT NULL) * @hat: true if the null- learning profile is a hat * @base: name to base the null profile off of * @gfp: type of allocation * * Find/Create a null- complain mode profile used in learning mode. The * name of the profile is unique and follows the format of parent//null-XXX. * where XXX is based on the @name or if that fails or is not supplied * a unique number * * null profiles are added to the profile list but the list does not * hold a count on them so that they are automatically released when * not in use. * * Returns: new refcounted profile else NULL on failure */ struct aa_profile *aa_new_null_profile(struct aa_profile *parent, bool hat, const char *base, gfp_t gfp) { struct aa_profile *profile; char *name; AA_BUG(!parent); if (base) { name = kmalloc(strlen(parent->base.hname) + 8 + strlen(base), gfp); if (name) { sprintf(name, "%s//null-%s", parent->base.hname, base); goto name; } /* fall through to try shorter uniq */ } name = kmalloc(strlen(parent->base.hname) + 2 + 7 + 8, gfp); if (!name) return NULL; sprintf(name, "%s//null-%x", parent->base.hname, atomic_inc_return(&parent->ns->uniq_null)); name: /* lookup to see if this is a dup creation */ profile = aa_find_child(parent, basename(name)); if (profile) goto out; profile = aa_alloc_profile(name, gfp); if (!profile) goto fail; profile->mode = APPARMOR_COMPLAIN; profile->flags |= PFLAG_NULL; if (hat) profile->flags |= PFLAG_HAT; profile->path_flags = parent->path_flags; /* released on free_profile */ rcu_assign_pointer(profile->parent, aa_get_profile(parent)); profile->ns = aa_get_ns(parent->ns); profile->file.dfa = aa_get_dfa(nulldfa); profile->policy.dfa = aa_get_dfa(nulldfa); mutex_lock(&profile->ns->lock); __list_add_profile(&parent->base.profiles, profile); mutex_unlock(&profile->ns->lock); /* refcount released by caller */ out: kfree(name); return profile; fail: kfree(name); aa_free_profile(profile); return NULL; } /* TODO: profile accounting - setup in remove */ /** * __find_child - find a profile on @head list with a name matching @name * @head: list to search (NOT NULL) * @name: name of profile (NOT NULL) * * Requires: rcu_read_lock be held * * Returns: unrefcounted profile ptr, or NULL if not found */ static struct aa_profile *__find_child(struct list_head *head, const char *name) { return (struct aa_profile *)__policy_find(head, name); } /** * __strn_find_child - find a profile on @head list using substring of @name * @head: list to search (NOT NULL) * @name: name of profile (NOT NULL) * @len: length of @name substring to match * * Requires: rcu_read_lock be held * * Returns: unrefcounted profile ptr, or NULL if not found */ static struct aa_profile *__strn_find_child(struct list_head *head, const char *name, int len) { return (struct aa_profile *)__policy_strn_find(head, name, len); } /** * aa_find_child - find a profile by @name in @parent * @parent: profile to search (NOT NULL) * @name: profile name to search for (NOT NULL) * * Returns: a refcounted profile or NULL if not found */ struct aa_profile *aa_find_child(struct aa_profile *parent, const char *name) { struct aa_profile *profile; rcu_read_lock(); do { profile = __find_child(&parent->base.profiles, name); } while (profile && !aa_get_profile_not0(profile)); rcu_read_unlock(); /* refcount released by caller */ return profile; } /** * __lookup_parent - lookup the parent of a profile of name @hname * @ns: namespace to lookup profile in (NOT NULL) * @hname: hierarchical profile name to find parent of (NOT NULL) * * Lookups up the parent of a fully qualified profile name, the profile * that matches hname does not need to exist, in general this * is used to load a new profile. * * Requires: rcu_read_lock be held * * Returns: unrefcounted policy or NULL if not found */ static struct aa_policy *__lookup_parent(struct aa_ns *ns, const char *hname) { struct aa_policy *policy; struct aa_profile *profile = NULL; char *split; policy = &ns->base; for (split = strstr(hname, "//"); split;) { profile = __strn_find_child(&policy->profiles, hname, split - hname); if (!profile) return NULL; policy = &profile->base; hname = split + 2; split = strstr(hname, "//"); } if (!profile) return &ns->base; return &profile->base; } /** * __lookupn_profile - lookup the profile matching @hname * @base: base list to start looking up profile name from (NOT NULL) * @hname: hierarchical profile name (NOT NULL) * @n: length of @hname * * Requires: rcu_read_lock be held * * Returns: unrefcounted profile pointer or NULL if not found * * Do a relative name lookup, recursing through profile tree. */ static struct aa_profile *__lookupn_profile(struct aa_policy *base, const char *hname, size_t n) { struct aa_profile *profile = NULL; const char *split; for (split = strnstr(hname, "//", n); split; split = strnstr(hname, "//", n)) { profile = __strn_find_child(&base->profiles, hname, split - hname); if (!profile) return NULL; base = &profile->base; n -= split + 2 - hname; hname = split + 2; } if (n) return __strn_find_child(&base->profiles, hname, n); return NULL; } static struct aa_profile *__lookup_profile(struct aa_policy *base, const char *hname) { return __lookupn_profile(base, hname, strlen(hname)); } /** * aa_lookup_profile - find a profile by its full or partial name * @ns: the namespace to start from (NOT NULL) * @hname: name to do lookup on. Does not contain namespace prefix (NOT NULL) * @n: size of @hname * * Returns: refcounted profile or NULL if not found */ struct aa_profile *aa_lookupn_profile(struct aa_ns *ns, const char *hname, size_t n) { struct aa_profile *profile; rcu_read_lock(); do { profile = __lookupn_profile(&ns->base, hname, n); } while (profile && !aa_get_profile_not0(profile)); rcu_read_unlock(); /* the unconfined profile is not in the regular profile list */ if (!profile && strncmp(hname, "unconfined", n) == 0) profile = aa_get_newest_profile(ns->unconfined); /* refcount released by caller */ return profile; } struct aa_profile *aa_lookup_profile(struct aa_ns *ns, const char *hname) { return aa_lookupn_profile(ns, hname, strlen(hname)); } struct aa_profile *aa_fqlookupn_profile(struct aa_profile *base, const char *fqname, size_t n) { struct aa_profile *profile; struct aa_ns *ns; const char *name, *ns_name; size_t ns_len; name = aa_splitn_fqname(fqname, n, &ns_name, &ns_len); if (ns_name) { ns = aa_findn_ns(base->ns, ns_name, ns_len); if (!ns) return NULL; } else ns = aa_get_ns(base->ns); if (name) profile = aa_lookupn_profile(ns, name, n - (name - fqname)); else if (ns) /* default profile for ns, currently unconfined */ profile = aa_get_newest_profile(ns->unconfined); else profile = NULL; aa_put_ns(ns); return profile; } /** * replacement_allowed - test to see if replacement is allowed * @profile: profile to test if it can be replaced (MAYBE NULL) * @noreplace: true if replacement shouldn't be allowed but addition is okay * @info: Returns - info about why replacement failed (NOT NULL) * * Returns: %0 if replacement allowed else error code */ static int replacement_allowed(struct aa_profile *profile, int noreplace, const char **info) { if (profile) { if (profile->flags & PFLAG_IMMUTABLE) { *info = "cannot replace immutible profile"; return -EPERM; } else if (noreplace) { *info = "profile already exists"; return -EEXIST; } } return 0; } /* audit callback for net specific fields */ static void audit_cb(struct audit_buffer *ab, void *va) { struct common_audit_data *sa = va; if (sa->aad->iface.ns) { audit_log_format(ab, " ns="); audit_log_untrustedstring(ab, sa->aad->iface.ns); } } /** * aa_audit_policy - Do auditing of policy changes * @profile: profile to check if it can manage policy * @op: policy operation being performed * @gfp: memory allocation flags * @nsname: name of the ns being manipulated (MAY BE NULL) * @name: name of profile being manipulated (NOT NULL) * @info: any extra information to be audited (MAYBE NULL) * @error: error code * * Returns: the error to be returned after audit is done */ static int audit_policy(struct aa_profile *profile, int op, gfp_t gfp, const char *nsname, const char *name, const char *info, int error) { struct common_audit_data sa; struct apparmor_audit_data aad = {0,}; sa.type = LSM_AUDIT_DATA_NONE; sa.aad = &aad; aad.op = op; aad.iface.ns = nsname; aad.name = name; aad.info = info; aad.error = error; return aa_audit(AUDIT_APPARMOR_STATUS, profile, gfp, &sa, audit_cb); } /** * policy_view_capable - check if viewing policy in at @ns is allowed * ns: namespace being viewed by current task (may be NULL) * Returns: true if viewing policy is allowed * * If @ns is NULL then the namespace being viewed is assumed to be the * tasks current namespace. */ bool policy_view_capable(struct aa_ns *ns) { struct user_namespace *user_ns = current_user_ns(); struct aa_ns *view_ns = aa_get_current_ns(); bool root_in_user_ns = uid_eq(current_euid(), make_kuid(user_ns, 0)) || in_egroup_p(make_kgid(user_ns, 0)); bool response = false; if (!ns) ns = view_ns; if (root_in_user_ns && aa_ns_visible(view_ns, ns, true) && (user_ns == &init_user_ns || (unprivileged_userns_apparmor_policy != 0 && user_ns->level == view_ns->level))) response = true; aa_put_ns(view_ns); return response; } bool policy_admin_capable(struct aa_ns *ns) { struct user_namespace *user_ns = current_user_ns(); bool capable = ns_capable(user_ns, CAP_MAC_ADMIN); AA_DEBUG("cap_mac_admin? %d\n", capable); AA_DEBUG("policy locked? %d\n", aa_g_lock_policy); return policy_view_capable(ns) && capable && !aa_g_lock_policy; } /** * aa_may_manage_policy - can the current task manage policy * @profile: profile to check if it can manage policy * @op: the policy manipulation operation being done * * Returns: 0 if the task is allowed to manipulate policy else error */ int aa_may_manage_policy(struct aa_profile *profile, struct aa_ns *ns, int op) { /* check if loading policy is locked out */ if (aa_g_lock_policy) return audit_policy(profile, op, GFP_KERNEL, NULL, NULL, "policy_locked", -EACCES); if (!policy_admin_capable(ns)) return audit_policy(profile, op, GFP_KERNEL, NULL, NULL, "not policy admin", -EACCES); /* TODO: add fine grained mediation of policy loads */ return 0; } static struct aa_profile *__list_lookup_parent(struct list_head *lh, struct aa_profile *profile) { const char *base = basename(profile->base.hname); long len = base - profile->base.hname; struct aa_load_ent *ent; /* parent won't have trailing // so remove from len */ if (len <= 2) return NULL; len -= 2; list_for_each_entry(ent, lh, list) { if (ent->new == profile) continue; if (strncmp(ent->new->base.hname, profile->base.hname, len) == 0 && ent->new->base.hname[len] == 0) return ent->new; } return NULL; } /** * __replace_profile - replace @old with @new on a list * @old: profile to be replaced (NOT NULL) * @new: profile to replace @old with (NOT NULL) * @share_proxy: transfer @old->proxy to @new * * Will duplicate and refcount elements that @new inherits from @old * and will inherit @old children. * * refcount @new for list, put @old list refcount * * Requires: namespace list lock be held, or list not be shared */ static void __replace_profile(struct aa_profile *old, struct aa_profile *new, bool share_proxy) { struct aa_profile *child, *tmp; if (!list_empty(&old->base.profiles)) { LIST_HEAD(lh); list_splice_init_rcu(&old->base.profiles, &lh, synchronize_rcu); list_for_each_entry_safe(child, tmp, &lh, base.list) { struct aa_profile *p; list_del_init(&child->base.list); p = __find_child(&new->base.profiles, child->base.name); if (p) { /* @p replaces @child */ __replace_profile(child, p, share_proxy); continue; } /* inherit @child and its children */ /* TODO: update hname of inherited children */ /* list refcount transferred to @new */ p = aa_deref_parent(child); rcu_assign_pointer(child->parent, aa_get_profile(new)); list_add_rcu(&child->base.list, &new->base.profiles); aa_put_profile(p); } } if (!rcu_access_pointer(new->parent)) { struct aa_profile *parent = aa_deref_parent(old); rcu_assign_pointer(new->parent, aa_get_profile(parent)); } __aa_update_proxy(old, new); if (share_proxy) { aa_put_proxy(new->proxy); new->proxy = aa_get_proxy(old->proxy); } else if (!rcu_access_pointer(new->proxy->profile)) /* aafs interface uses proxy */ rcu_assign_pointer(new->proxy->profile, aa_get_profile(new)); __aa_fs_profile_migrate_dents(old, new); if (list_empty(&new->base.list)) { /* new is not on a list already */ list_replace_rcu(&old->base.list, &new->base.list); aa_get_profile(new); aa_put_profile(old); } else __list_remove_profile(old); } /** * __lookup_replace - lookup replacement information for a profile * @ns - namespace the lookup occurs in * @hname - name of profile to lookup * @noreplace - true if not replacing an existing profile * @p - Returns: profile to be replaced * @info - Returns: info string on why lookup failed * * Returns: profile to replace (no ref) on success else ptr error */ static int __lookup_replace(struct aa_ns *ns, const char *hname, bool noreplace, struct aa_profile **p, const char **info) { *p = aa_get_profile(__lookup_profile(&ns->base, hname)); if (*p) { int error = replacement_allowed(*p, noreplace, info); if (error) { *info = "profile can not be replaced"; return error; } } return 0; } /** * aa_replace_profiles - replace profile(s) on the profile list * @view: namespace load is viewed from * @noreplace: true if only doing addition, no replacement allowed * @udata: serialized data stream (NOT NULL) * * unpack and replace a profile on the profile list and uses of that profile * by any aa_task_cxt. If the profile does not exist on the profile list * it is added. * * Returns: size of data consumed else error code on failure. */ ssize_t aa_replace_profiles(struct aa_ns *view, bool noreplace, struct aa_loaddata *udata) { const char *ns_name, *info = NULL; struct aa_ns *ns = NULL; struct aa_load_ent *ent, *tmp; int op = OP_PROF_REPL; ssize_t error; LIST_HEAD(lh); /* released below */ error = aa_unpack(udata, &lh, &ns_name); if (error) goto out; /* released below */ ns = aa_prepare_ns(view, ns_name); if (!ns) { error = audit_policy(__aa_current_profile(), op, GFP_KERNEL, NULL, ns_name, "failed to prepare namespace", -ENOMEM); goto free; } mutex_lock(&ns->lock); /* setup parent and ns info */ list_for_each_entry(ent, &lh, list) { struct aa_policy *policy; ent->new->rawdata = aa_get_loaddata(udata); error = __lookup_replace(ns, ent->new->base.hname, noreplace, &ent->old, &info); if (error) goto fail_lock; if (ent->new->rename) { error = __lookup_replace(ns, ent->new->rename, noreplace, &ent->rename, &info); if (error) goto fail_lock; } /* released when @new is freed */ ent->new->ns = aa_get_ns(ns); if (ent->old || ent->rename) continue; /* no ref on policy only use inside lock */ policy = __lookup_parent(ns, ent->new->base.hname); if (!policy) { struct aa_profile *p; p = __list_lookup_parent(&lh, ent->new); if (!p) { error = -ENOENT; info = "parent does not exist"; goto fail_lock; } rcu_assign_pointer(ent->new->parent, aa_get_profile(p)); } else if (policy != &ns->base) { /* released on profile replacement or free_profile */ struct aa_profile *p = (struct aa_profile *) policy; rcu_assign_pointer(ent->new->parent, aa_get_profile(p)); } } /* create new fs entries for introspection if needed */ list_for_each_entry(ent, &lh, list) { if (ent->old) { /* inherit old interface files */ /* if (ent->rename) TODO: support rename */ /* } else if (ent->rename) { TODO: support rename */ } else { struct dentry *parent; if (rcu_access_pointer(ent->new->parent)) { struct aa_profile *p; p = aa_deref_parent(ent->new); parent = prof_child_dir(p); } else parent = ns_subprofs_dir(ent->new->ns); error = __aa_fs_profile_mkdir(ent->new, parent); } if (error) { info = "failed to create "; goto fail_lock; } } /* Done with checks that may fail - do actual replacement */ list_for_each_entry_safe(ent, tmp, &lh, list) { list_del_init(&ent->list); op = (!ent->old && !ent->rename) ? OP_PROF_LOAD : OP_PROF_REPL; audit_policy(__aa_current_profile(), op, GFP_ATOMIC, NULL, ent->new->base.hname, NULL, error); if (ent->old) { __replace_profile(ent->old, ent->new, 1); if (ent->rename) { /* aafs interface uses proxy */ struct aa_proxy *r = ent->new->proxy; rcu_assign_pointer(r->profile, aa_get_profile(ent->new)); __replace_profile(ent->rename, ent->new, 0); } } else if (ent->rename) { /* aafs interface uses proxy */ rcu_assign_pointer(ent->new->proxy->profile, aa_get_profile(ent->new)); __replace_profile(ent->rename, ent->new, 0); } else if (ent->new->parent) { struct aa_profile *parent, *newest; parent = aa_deref_parent(ent->new); newest = aa_get_newest_profile(parent); /* parent replaced in this atomic set? */ if (newest != parent) { aa_get_profile(newest); rcu_assign_pointer(ent->new->parent, newest); aa_put_profile(parent); } /* aafs interface uses proxy */ rcu_assign_pointer(ent->new->proxy->profile, aa_get_profile(ent->new)); __list_add_profile(&newest->base.profiles, ent->new); aa_put_profile(newest); } else { /* aafs interface uses proxy */ rcu_assign_pointer(ent->new->proxy->profile, aa_get_profile(ent->new)); __list_add_profile(&ns->base.profiles, ent->new); } aa_load_ent_free(ent); } mutex_unlock(&ns->lock); out: aa_put_ns(ns); if (error) return error; return udata->size; fail_lock: mutex_unlock(&ns->lock); /* audit cause of failure */ op = (!ent->old) ? OP_PROF_LOAD : OP_PROF_REPL; audit_policy(__aa_current_profile(), op, GFP_KERNEL, NULL, ent->new->base.hname, info, error); /* audit status that rest of profiles in the atomic set failed too */ info = "valid profile in failed atomic policy load"; list_for_each_entry(tmp, &lh, list) { if (tmp == ent) { info = "unchecked profile in failed atomic policy load"; /* skip entry that caused failure */ continue; } op = (!ent->old) ? OP_PROF_LOAD : OP_PROF_REPL; audit_policy(__aa_current_profile(), op, GFP_KERNEL, NULL, tmp->new->base.hname, info, error); } free: list_for_each_entry_safe(ent, tmp, &lh, list) { list_del_init(&ent->list); aa_load_ent_free(ent); } goto out; } /** * aa_remove_profiles - remove profile(s) from the system * @view: namespace the remove is being done from * @fqname: name of the profile or namespace to remove (NOT NULL) * @size: size of the name * * Remove a profile or sub namespace from the current namespace, so that * they can not be found anymore and mark them as replaced by unconfined * * NOTE: removing confinement does not restore rlimits to preconfinemnet values * * Returns: size of data consume else error code if fails */ ssize_t aa_remove_profiles(struct aa_ns *view, char *fqname, size_t size) { struct aa_ns *root = NULL, *ns = NULL; struct aa_profile *profile = NULL; const char *name = fqname, *info = NULL; ssize_t error = 0; if (*fqname == 0) { info = "no profile specified"; error = -ENOENT; goto fail; } root = view; if (fqname[0] == ':') { char *ns_name; name = aa_split_fqname(fqname, &ns_name); /* released below */ ns = aa_find_ns(root, ns_name); if (!ns) { info = "namespace does not exist"; error = -ENOENT; goto fail; } } else /* released below */ ns = aa_get_ns(root); if (!name) { /* remove namespace - can only happen if fqname[0] == ':' */ mutex_lock(&ns->parent->lock); __aa_remove_ns(ns); mutex_unlock(&ns->parent->lock); } else { /* remove profile */ mutex_lock(&ns->lock); profile = aa_get_profile(__lookup_profile(&ns->base, name)); if (!profile) { error = -ENOENT; info = "profile does not exist"; goto fail_ns_lock; } name = profile->base.hname; __remove_profile(profile); mutex_unlock(&ns->lock); } /* don't fail removal if audit fails */ (void) audit_policy(__aa_current_profile(), OP_PROF_RM, GFP_KERNEL, NULL, name, info, error); aa_put_ns(ns); aa_put_profile(profile); return size; fail_ns_lock: mutex_unlock(&ns->lock); aa_put_ns(ns); fail: (void) audit_policy(__aa_current_profile(), OP_PROF_RM, GFP_KERNEL, NULL, name, info, error); return error; }