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-rw-r--r--ANDROID_3.4.5/security/tomoyo/gc.c655
1 files changed, 0 insertions, 655 deletions
diff --git a/ANDROID_3.4.5/security/tomoyo/gc.c b/ANDROID_3.4.5/security/tomoyo/gc.c
deleted file mode 100644
index 986a6a75..00000000
--- a/ANDROID_3.4.5/security/tomoyo/gc.c
+++ /dev/null
@@ -1,655 +0,0 @@
-/*
- * security/tomoyo/gc.c
- *
- * Copyright (C) 2005-2011 NTT DATA CORPORATION
- */
-
-#include "common.h"
-#include <linux/kthread.h>
-#include <linux/slab.h>
-
-/**
- * tomoyo_memory_free - Free memory for elements.
- *
- * @ptr: Pointer to allocated memory.
- *
- * Returns nothing.
- *
- * Caller holds tomoyo_policy_lock mutex.
- */
-static inline void tomoyo_memory_free(void *ptr)
-{
- tomoyo_memory_used[TOMOYO_MEMORY_POLICY] -= ksize(ptr);
- kfree(ptr);
-}
-
-/* The list for "struct tomoyo_io_buffer". */
-static LIST_HEAD(tomoyo_io_buffer_list);
-/* Lock for protecting tomoyo_io_buffer_list. */
-static DEFINE_SPINLOCK(tomoyo_io_buffer_list_lock);
-
-/**
- * tomoyo_struct_used_by_io_buffer - Check whether the list element is used by /sys/kernel/security/tomoyo/ users or not.
- *
- * @element: Pointer to "struct list_head".
- *
- * Returns true if @element is used by /sys/kernel/security/tomoyo/ users,
- * false otherwise.
- */
-static bool tomoyo_struct_used_by_io_buffer(const struct list_head *element)
-{
- struct tomoyo_io_buffer *head;
- bool in_use = false;
-
- spin_lock(&tomoyo_io_buffer_list_lock);
- list_for_each_entry(head, &tomoyo_io_buffer_list, list) {
- head->users++;
- spin_unlock(&tomoyo_io_buffer_list_lock);
- mutex_lock(&head->io_sem);
- if (head->r.domain == element || head->r.group == element ||
- head->r.acl == element || &head->w.domain->list == element)
- in_use = true;
- mutex_unlock(&head->io_sem);
- spin_lock(&tomoyo_io_buffer_list_lock);
- head->users--;
- if (in_use)
- break;
- }
- spin_unlock(&tomoyo_io_buffer_list_lock);
- return in_use;
-}
-
-/**
- * tomoyo_name_used_by_io_buffer - Check whether the string is used by /sys/kernel/security/tomoyo/ users or not.
- *
- * @string: String to check.
- *
- * Returns true if @string is used by /sys/kernel/security/tomoyo/ users,
- * false otherwise.
- */
-static bool tomoyo_name_used_by_io_buffer(const char *string)
-{
- struct tomoyo_io_buffer *head;
- const size_t size = strlen(string) + 1;
- bool in_use = false;
-
- spin_lock(&tomoyo_io_buffer_list_lock);
- list_for_each_entry(head, &tomoyo_io_buffer_list, list) {
- int i;
- head->users++;
- spin_unlock(&tomoyo_io_buffer_list_lock);
- mutex_lock(&head->io_sem);
- for (i = 0; i < TOMOYO_MAX_IO_READ_QUEUE; i++) {
- const char *w = head->r.w[i];
- if (w < string || w > string + size)
- continue;
- in_use = true;
- break;
- }
- mutex_unlock(&head->io_sem);
- spin_lock(&tomoyo_io_buffer_list_lock);
- head->users--;
- if (in_use)
- break;
- }
- spin_unlock(&tomoyo_io_buffer_list_lock);
- return in_use;
-}
-
-/**
- * tomoyo_del_transition_control - Delete members in "struct tomoyo_transition_control".
- *
- * @element: Pointer to "struct list_head".
- *
- * Returns nothing.
- */
-static inline void tomoyo_del_transition_control(struct list_head *element)
-{
- struct tomoyo_transition_control *ptr =
- container_of(element, typeof(*ptr), head.list);
- tomoyo_put_name(ptr->domainname);
- tomoyo_put_name(ptr->program);
-}
-
-/**
- * tomoyo_del_aggregator - Delete members in "struct tomoyo_aggregator".
- *
- * @element: Pointer to "struct list_head".
- *
- * Returns nothing.
- */
-static inline void tomoyo_del_aggregator(struct list_head *element)
-{
- struct tomoyo_aggregator *ptr =
- container_of(element, typeof(*ptr), head.list);
- tomoyo_put_name(ptr->original_name);
- tomoyo_put_name(ptr->aggregated_name);
-}
-
-/**
- * tomoyo_del_manager - Delete members in "struct tomoyo_manager".
- *
- * @element: Pointer to "struct list_head".
- *
- * Returns nothing.
- */
-static inline void tomoyo_del_manager(struct list_head *element)
-{
- struct tomoyo_manager *ptr =
- container_of(element, typeof(*ptr), head.list);
- tomoyo_put_name(ptr->manager);
-}
-
-/**
- * tomoyo_del_acl - Delete members in "struct tomoyo_acl_info".
- *
- * @element: Pointer to "struct list_head".
- *
- * Returns nothing.
- */
-static void tomoyo_del_acl(struct list_head *element)
-{
- struct tomoyo_acl_info *acl =
- container_of(element, typeof(*acl), list);
- tomoyo_put_condition(acl->cond);
- switch (acl->type) {
- case TOMOYO_TYPE_PATH_ACL:
- {
- struct tomoyo_path_acl *entry
- = container_of(acl, typeof(*entry), head);
- tomoyo_put_name_union(&entry->name);
- }
- break;
- case TOMOYO_TYPE_PATH2_ACL:
- {
- struct tomoyo_path2_acl *entry
- = container_of(acl, typeof(*entry), head);
- tomoyo_put_name_union(&entry->name1);
- tomoyo_put_name_union(&entry->name2);
- }
- break;
- case TOMOYO_TYPE_PATH_NUMBER_ACL:
- {
- struct tomoyo_path_number_acl *entry
- = container_of(acl, typeof(*entry), head);
- tomoyo_put_name_union(&entry->name);
- tomoyo_put_number_union(&entry->number);
- }
- break;
- case TOMOYO_TYPE_MKDEV_ACL:
- {
- struct tomoyo_mkdev_acl *entry
- = container_of(acl, typeof(*entry), head);
- tomoyo_put_name_union(&entry->name);
- tomoyo_put_number_union(&entry->mode);
- tomoyo_put_number_union(&entry->major);
- tomoyo_put_number_union(&entry->minor);
- }
- break;
- case TOMOYO_TYPE_MOUNT_ACL:
- {
- struct tomoyo_mount_acl *entry
- = container_of(acl, typeof(*entry), head);
- tomoyo_put_name_union(&entry->dev_name);
- tomoyo_put_name_union(&entry->dir_name);
- tomoyo_put_name_union(&entry->fs_type);
- tomoyo_put_number_union(&entry->flags);
- }
- break;
- case TOMOYO_TYPE_ENV_ACL:
- {
- struct tomoyo_env_acl *entry =
- container_of(acl, typeof(*entry), head);
-
- tomoyo_put_name(entry->env);
- }
- break;
- case TOMOYO_TYPE_INET_ACL:
- {
- struct tomoyo_inet_acl *entry =
- container_of(acl, typeof(*entry), head);
-
- tomoyo_put_group(entry->address.group);
- tomoyo_put_number_union(&entry->port);
- }
- break;
- case TOMOYO_TYPE_UNIX_ACL:
- {
- struct tomoyo_unix_acl *entry =
- container_of(acl, typeof(*entry), head);
-
- tomoyo_put_name_union(&entry->name);
- }
- break;
- case TOMOYO_TYPE_MANUAL_TASK_ACL:
- {
- struct tomoyo_task_acl *entry =
- container_of(acl, typeof(*entry), head);
- tomoyo_put_name(entry->domainname);
- }
- break;
- }
-}
-
-/**
- * tomoyo_del_domain - Delete members in "struct tomoyo_domain_info".
- *
- * @element: Pointer to "struct list_head".
- *
- * Returns nothing.
- *
- * Caller holds tomoyo_policy_lock mutex.
- */
-static inline void tomoyo_del_domain(struct list_head *element)
-{
- struct tomoyo_domain_info *domain =
- container_of(element, typeof(*domain), list);
- struct tomoyo_acl_info *acl;
- struct tomoyo_acl_info *tmp;
- /*
- * Since this domain is referenced from neither
- * "struct tomoyo_io_buffer" nor "struct cred"->security, we can delete
- * elements without checking for is_deleted flag.
- */
- list_for_each_entry_safe(acl, tmp, &domain->acl_info_list, list) {
- tomoyo_del_acl(&acl->list);
- tomoyo_memory_free(acl);
- }
- tomoyo_put_name(domain->domainname);
-}
-
-/**
- * tomoyo_del_condition - Delete members in "struct tomoyo_condition".
- *
- * @element: Pointer to "struct list_head".
- *
- * Returns nothing.
- */
-void tomoyo_del_condition(struct list_head *element)
-{
- struct tomoyo_condition *cond = container_of(element, typeof(*cond),
- head.list);
- const u16 condc = cond->condc;
- const u16 numbers_count = cond->numbers_count;
- const u16 names_count = cond->names_count;
- const u16 argc = cond->argc;
- const u16 envc = cond->envc;
- unsigned int i;
- const struct tomoyo_condition_element *condp
- = (const struct tomoyo_condition_element *) (cond + 1);
- struct tomoyo_number_union *numbers_p
- = (struct tomoyo_number_union *) (condp + condc);
- struct tomoyo_name_union *names_p
- = (struct tomoyo_name_union *) (numbers_p + numbers_count);
- const struct tomoyo_argv *argv
- = (const struct tomoyo_argv *) (names_p + names_count);
- const struct tomoyo_envp *envp
- = (const struct tomoyo_envp *) (argv + argc);
- for (i = 0; i < numbers_count; i++)
- tomoyo_put_number_union(numbers_p++);
- for (i = 0; i < names_count; i++)
- tomoyo_put_name_union(names_p++);
- for (i = 0; i < argc; argv++, i++)
- tomoyo_put_name(argv->value);
- for (i = 0; i < envc; envp++, i++) {
- tomoyo_put_name(envp->name);
- tomoyo_put_name(envp->value);
- }
-}
-
-/**
- * tomoyo_del_name - Delete members in "struct tomoyo_name".
- *
- * @element: Pointer to "struct list_head".
- *
- * Returns nothing.
- */
-static inline void tomoyo_del_name(struct list_head *element)
-{
- /* Nothing to do. */
-}
-
-/**
- * tomoyo_del_path_group - Delete members in "struct tomoyo_path_group".
- *
- * @element: Pointer to "struct list_head".
- *
- * Returns nothing.
- */
-static inline void tomoyo_del_path_group(struct list_head *element)
-{
- struct tomoyo_path_group *member =
- container_of(element, typeof(*member), head.list);
- tomoyo_put_name(member->member_name);
-}
-
-/**
- * tomoyo_del_group - Delete "struct tomoyo_group".
- *
- * @element: Pointer to "struct list_head".
- *
- * Returns nothing.
- */
-static inline void tomoyo_del_group(struct list_head *element)
-{
- struct tomoyo_group *group =
- container_of(element, typeof(*group), head.list);
- tomoyo_put_name(group->group_name);
-}
-
-/**
- * tomoyo_del_address_group - Delete members in "struct tomoyo_address_group".
- *
- * @element: Pointer to "struct list_head".
- *
- * Returns nothing.
- */
-static inline void tomoyo_del_address_group(struct list_head *element)
-{
- /* Nothing to do. */
-}
-
-/**
- * tomoyo_del_number_group - Delete members in "struct tomoyo_number_group".
- *
- * @element: Pointer to "struct list_head".
- *
- * Returns nothing.
- */
-static inline void tomoyo_del_number_group(struct list_head *element)
-{
- /* Nothing to do. */
-}
-
-/**
- * tomoyo_try_to_gc - Try to kfree() an entry.
- *
- * @type: One of values in "enum tomoyo_policy_id".
- * @element: Pointer to "struct list_head".
- *
- * Returns nothing.
- *
- * Caller holds tomoyo_policy_lock mutex.
- */
-static void tomoyo_try_to_gc(const enum tomoyo_policy_id type,
- struct list_head *element)
-{
- /*
- * __list_del_entry() guarantees that the list element became no longer
- * reachable from the list which the element was originally on (e.g.
- * tomoyo_domain_list). Also, synchronize_srcu() guarantees that the
- * list element became no longer referenced by syscall users.
- */
- __list_del_entry(element);
- mutex_unlock(&tomoyo_policy_lock);
- synchronize_srcu(&tomoyo_ss);
- /*
- * However, there are two users which may still be using the list
- * element. We need to defer until both users forget this element.
- *
- * Don't kfree() until "struct tomoyo_io_buffer"->r.{domain,group,acl}
- * and "struct tomoyo_io_buffer"->w.domain forget this element.
- */
- if (tomoyo_struct_used_by_io_buffer(element))
- goto reinject;
- switch (type) {
- case TOMOYO_ID_TRANSITION_CONTROL:
- tomoyo_del_transition_control(element);
- break;
- case TOMOYO_ID_MANAGER:
- tomoyo_del_manager(element);
- break;
- case TOMOYO_ID_AGGREGATOR:
- tomoyo_del_aggregator(element);
- break;
- case TOMOYO_ID_GROUP:
- tomoyo_del_group(element);
- break;
- case TOMOYO_ID_PATH_GROUP:
- tomoyo_del_path_group(element);
- break;
- case TOMOYO_ID_ADDRESS_GROUP:
- tomoyo_del_address_group(element);
- break;
- case TOMOYO_ID_NUMBER_GROUP:
- tomoyo_del_number_group(element);
- break;
- case TOMOYO_ID_CONDITION:
- tomoyo_del_condition(element);
- break;
- case TOMOYO_ID_NAME:
- /*
- * Don't kfree() until all "struct tomoyo_io_buffer"->r.w[]
- * forget this element.
- */
- if (tomoyo_name_used_by_io_buffer
- (container_of(element, typeof(struct tomoyo_name),
- head.list)->entry.name))
- goto reinject;
- tomoyo_del_name(element);
- break;
- case TOMOYO_ID_ACL:
- tomoyo_del_acl(element);
- break;
- case TOMOYO_ID_DOMAIN:
- /*
- * Don't kfree() until all "struct cred"->security forget this
- * element.
- */
- if (atomic_read(&container_of
- (element, typeof(struct tomoyo_domain_info),
- list)->users))
- goto reinject;
- break;
- case TOMOYO_MAX_POLICY:
- break;
- }
- mutex_lock(&tomoyo_policy_lock);
- if (type == TOMOYO_ID_DOMAIN)
- tomoyo_del_domain(element);
- tomoyo_memory_free(element);
- return;
-reinject:
- /*
- * We can safely reinject this element here bacause
- * (1) Appending list elements and removing list elements are protected
- * by tomoyo_policy_lock mutex.
- * (2) Only this function removes list elements and this function is
- * exclusively executed by tomoyo_gc_mutex mutex.
- * are true.
- */
- mutex_lock(&tomoyo_policy_lock);
- list_add_rcu(element, element->prev);
-}
-
-/**
- * tomoyo_collect_member - Delete elements with "struct tomoyo_acl_head".
- *
- * @id: One of values in "enum tomoyo_policy_id".
- * @member_list: Pointer to "struct list_head".
- *
- * Returns nothing.
- */
-static void tomoyo_collect_member(const enum tomoyo_policy_id id,
- struct list_head *member_list)
-{
- struct tomoyo_acl_head *member;
- struct tomoyo_acl_head *tmp;
- list_for_each_entry_safe(member, tmp, member_list, list) {
- if (!member->is_deleted)
- continue;
- member->is_deleted = TOMOYO_GC_IN_PROGRESS;
- tomoyo_try_to_gc(id, &member->list);
- }
-}
-
-/**
- * tomoyo_collect_acl - Delete elements in "struct tomoyo_domain_info".
- *
- * @list: Pointer to "struct list_head".
- *
- * Returns nothing.
- */
-static void tomoyo_collect_acl(struct list_head *list)
-{
- struct tomoyo_acl_info *acl;
- struct tomoyo_acl_info *tmp;
- list_for_each_entry_safe(acl, tmp, list, list) {
- if (!acl->is_deleted)
- continue;
- acl->is_deleted = TOMOYO_GC_IN_PROGRESS;
- tomoyo_try_to_gc(TOMOYO_ID_ACL, &acl->list);
- }
-}
-
-/**
- * tomoyo_collect_entry - Try to kfree() deleted elements.
- *
- * Returns nothing.
- */
-static void tomoyo_collect_entry(void)
-{
- int i;
- enum tomoyo_policy_id id;
- struct tomoyo_policy_namespace *ns;
- mutex_lock(&tomoyo_policy_lock);
- {
- struct tomoyo_domain_info *domain;
- struct tomoyo_domain_info *tmp;
- list_for_each_entry_safe(domain, tmp, &tomoyo_domain_list,
- list) {
- tomoyo_collect_acl(&domain->acl_info_list);
- if (!domain->is_deleted || atomic_read(&domain->users))
- continue;
- tomoyo_try_to_gc(TOMOYO_ID_DOMAIN, &domain->list);
- }
- }
- list_for_each_entry(ns, &tomoyo_namespace_list, namespace_list) {
- for (id = 0; id < TOMOYO_MAX_POLICY; id++)
- tomoyo_collect_member(id, &ns->policy_list[id]);
- for (i = 0; i < TOMOYO_MAX_ACL_GROUPS; i++)
- tomoyo_collect_acl(&ns->acl_group[i]);
- }
- {
- struct tomoyo_shared_acl_head *ptr;
- struct tomoyo_shared_acl_head *tmp;
- list_for_each_entry_safe(ptr, tmp, &tomoyo_condition_list,
- list) {
- if (atomic_read(&ptr->users) > 0)
- continue;
- atomic_set(&ptr->users, TOMOYO_GC_IN_PROGRESS);
- tomoyo_try_to_gc(TOMOYO_ID_CONDITION, &ptr->list);
- }
- }
- list_for_each_entry(ns, &tomoyo_namespace_list, namespace_list) {
- for (i = 0; i < TOMOYO_MAX_GROUP; i++) {
- struct list_head *list = &ns->group_list[i];
- struct tomoyo_group *group;
- struct tomoyo_group *tmp;
- switch (i) {
- case 0:
- id = TOMOYO_ID_PATH_GROUP;
- break;
- case 1:
- id = TOMOYO_ID_NUMBER_GROUP;
- break;
- default:
- id = TOMOYO_ID_ADDRESS_GROUP;
- break;
- }
- list_for_each_entry_safe(group, tmp, list, head.list) {
- tomoyo_collect_member(id, &group->member_list);
- if (!list_empty(&group->member_list) ||
- atomic_read(&group->head.users) > 0)
- continue;
- atomic_set(&group->head.users,
- TOMOYO_GC_IN_PROGRESS);
- tomoyo_try_to_gc(TOMOYO_ID_GROUP,
- &group->head.list);
- }
- }
- }
- for (i = 0; i < TOMOYO_MAX_HASH; i++) {
- struct list_head *list = &tomoyo_name_list[i];
- struct tomoyo_shared_acl_head *ptr;
- struct tomoyo_shared_acl_head *tmp;
- list_for_each_entry_safe(ptr, tmp, list, list) {
- if (atomic_read(&ptr->users) > 0)
- continue;
- atomic_set(&ptr->users, TOMOYO_GC_IN_PROGRESS);
- tomoyo_try_to_gc(TOMOYO_ID_NAME, &ptr->list);
- }
- }
- mutex_unlock(&tomoyo_policy_lock);
-}
-
-/**
- * tomoyo_gc_thread - Garbage collector thread function.
- *
- * @unused: Unused.
- *
- * Returns 0.
- */
-static int tomoyo_gc_thread(void *unused)
-{
- /* Garbage collector thread is exclusive. */
- static DEFINE_MUTEX(tomoyo_gc_mutex);
- if (!mutex_trylock(&tomoyo_gc_mutex))
- goto out;
- tomoyo_collect_entry();
- {
- struct tomoyo_io_buffer *head;
- struct tomoyo_io_buffer *tmp;
-
- spin_lock(&tomoyo_io_buffer_list_lock);
- list_for_each_entry_safe(head, tmp, &tomoyo_io_buffer_list,
- list) {
- if (head->users)
- continue;
- list_del(&head->list);
- kfree(head->read_buf);
- kfree(head->write_buf);
- kfree(head);
- }
- spin_unlock(&tomoyo_io_buffer_list_lock);
- }
- mutex_unlock(&tomoyo_gc_mutex);
-out:
- /* This acts as do_exit(0). */
- return 0;
-}
-
-/**
- * tomoyo_notify_gc - Register/unregister /sys/kernel/security/tomoyo/ users.
- *
- * @head: Pointer to "struct tomoyo_io_buffer".
- * @is_register: True if register, false if unregister.
- *
- * Returns nothing.
- */
-void tomoyo_notify_gc(struct tomoyo_io_buffer *head, const bool is_register)
-{
- bool is_write = false;
-
- spin_lock(&tomoyo_io_buffer_list_lock);
- if (is_register) {
- head->users = 1;
- list_add(&head->list, &tomoyo_io_buffer_list);
- } else {
- is_write = head->write_buf != NULL;
- if (!--head->users) {
- list_del(&head->list);
- kfree(head->read_buf);
- kfree(head->write_buf);
- kfree(head);
- }
- }
- spin_unlock(&tomoyo_io_buffer_list_lock);
- if (is_write) {
- struct task_struct *task = kthread_create(tomoyo_gc_thread,
- NULL,
- "GC for TOMOYO");
- if (!IS_ERR(task))
- wake_up_process(task);
- }
-}
generated by cgit (git 2.34.1) at 2025-07-05 01:59:38 +0000