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670 lines
17 KiB
670 lines
17 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* security/tomoyo/gc.c |
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* |
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* Copyright (C) 2005-2011 NTT DATA CORPORATION |
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*/ |
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|
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#include "common.h" |
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#include <linux/kthread.h> |
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#include <linux/slab.h> |
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|
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/** |
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* tomoyo_memory_free - Free memory for elements. |
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* |
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* @ptr: Pointer to allocated memory. |
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* |
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* Returns nothing. |
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* |
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* Caller holds tomoyo_policy_lock mutex. |
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*/ |
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static inline void tomoyo_memory_free(void *ptr) |
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{ |
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tomoyo_memory_used[TOMOYO_MEMORY_POLICY] -= ksize(ptr); |
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kfree(ptr); |
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} |
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/* The list for "struct tomoyo_io_buffer". */ |
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static LIST_HEAD(tomoyo_io_buffer_list); |
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/* Lock for protecting tomoyo_io_buffer_list. */ |
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static DEFINE_SPINLOCK(tomoyo_io_buffer_list_lock); |
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|
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/** |
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* tomoyo_struct_used_by_io_buffer - Check whether the list element is used by /sys/kernel/security/tomoyo/ users or not. |
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* |
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* @element: Pointer to "struct list_head". |
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* |
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* Returns true if @element is used by /sys/kernel/security/tomoyo/ users, |
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* false otherwise. |
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*/ |
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static bool tomoyo_struct_used_by_io_buffer(const struct list_head *element) |
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{ |
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struct tomoyo_io_buffer *head; |
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bool in_use = false; |
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spin_lock(&tomoyo_io_buffer_list_lock); |
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list_for_each_entry(head, &tomoyo_io_buffer_list, list) { |
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head->users++; |
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spin_unlock(&tomoyo_io_buffer_list_lock); |
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mutex_lock(&head->io_sem); |
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if (head->r.domain == element || head->r.group == element || |
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head->r.acl == element || &head->w.domain->list == element) |
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in_use = true; |
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mutex_unlock(&head->io_sem); |
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spin_lock(&tomoyo_io_buffer_list_lock); |
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head->users--; |
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if (in_use) |
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break; |
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} |
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spin_unlock(&tomoyo_io_buffer_list_lock); |
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return in_use; |
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} |
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/** |
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* tomoyo_name_used_by_io_buffer - Check whether the string is used by /sys/kernel/security/tomoyo/ users or not. |
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* |
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* @string: String to check. |
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* |
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* Returns true if @string is used by /sys/kernel/security/tomoyo/ users, |
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* false otherwise. |
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*/ |
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static bool tomoyo_name_used_by_io_buffer(const char *string) |
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{ |
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struct tomoyo_io_buffer *head; |
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const size_t size = strlen(string) + 1; |
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bool in_use = false; |
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spin_lock(&tomoyo_io_buffer_list_lock); |
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list_for_each_entry(head, &tomoyo_io_buffer_list, list) { |
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int i; |
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head->users++; |
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spin_unlock(&tomoyo_io_buffer_list_lock); |
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mutex_lock(&head->io_sem); |
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for (i = 0; i < TOMOYO_MAX_IO_READ_QUEUE; i++) { |
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const char *w = head->r.w[i]; |
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if (w < string || w > string + size) |
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continue; |
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in_use = true; |
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break; |
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} |
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mutex_unlock(&head->io_sem); |
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spin_lock(&tomoyo_io_buffer_list_lock); |
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head->users--; |
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if (in_use) |
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break; |
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} |
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spin_unlock(&tomoyo_io_buffer_list_lock); |
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return in_use; |
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} |
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/** |
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* tomoyo_del_transition_control - Delete members in "struct tomoyo_transition_control". |
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* |
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* @element: Pointer to "struct list_head". |
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* |
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* Returns nothing. |
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*/ |
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static inline void tomoyo_del_transition_control(struct list_head *element) |
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{ |
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struct tomoyo_transition_control *ptr = |
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container_of(element, typeof(*ptr), head.list); |
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tomoyo_put_name(ptr->domainname); |
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tomoyo_put_name(ptr->program); |
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} |
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/** |
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* tomoyo_del_aggregator - Delete members in "struct tomoyo_aggregator". |
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* |
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* @element: Pointer to "struct list_head". |
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* |
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* Returns nothing. |
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*/ |
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static inline void tomoyo_del_aggregator(struct list_head *element) |
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{ |
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struct tomoyo_aggregator *ptr = |
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container_of(element, typeof(*ptr), head.list); |
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tomoyo_put_name(ptr->original_name); |
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tomoyo_put_name(ptr->aggregated_name); |
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} |
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/** |
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* tomoyo_del_manager - Delete members in "struct tomoyo_manager". |
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* |
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* @element: Pointer to "struct list_head". |
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* |
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* Returns nothing. |
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*/ |
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static inline void tomoyo_del_manager(struct list_head *element) |
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{ |
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struct tomoyo_manager *ptr = |
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container_of(element, typeof(*ptr), head.list); |
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tomoyo_put_name(ptr->manager); |
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} |
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/** |
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* tomoyo_del_acl - Delete members in "struct tomoyo_acl_info". |
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* |
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* @element: Pointer to "struct list_head". |
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* |
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* Returns nothing. |
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*/ |
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static void tomoyo_del_acl(struct list_head *element) |
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{ |
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struct tomoyo_acl_info *acl = |
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container_of(element, typeof(*acl), list); |
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tomoyo_put_condition(acl->cond); |
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switch (acl->type) { |
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case TOMOYO_TYPE_PATH_ACL: |
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{ |
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struct tomoyo_path_acl *entry |
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= container_of(acl, typeof(*entry), head); |
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tomoyo_put_name_union(&entry->name); |
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} |
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break; |
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case TOMOYO_TYPE_PATH2_ACL: |
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{ |
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struct tomoyo_path2_acl *entry |
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= container_of(acl, typeof(*entry), head); |
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tomoyo_put_name_union(&entry->name1); |
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tomoyo_put_name_union(&entry->name2); |
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} |
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break; |
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case TOMOYO_TYPE_PATH_NUMBER_ACL: |
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{ |
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struct tomoyo_path_number_acl *entry |
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= container_of(acl, typeof(*entry), head); |
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tomoyo_put_name_union(&entry->name); |
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tomoyo_put_number_union(&entry->number); |
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} |
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break; |
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case TOMOYO_TYPE_MKDEV_ACL: |
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{ |
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struct tomoyo_mkdev_acl *entry |
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= container_of(acl, typeof(*entry), head); |
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tomoyo_put_name_union(&entry->name); |
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tomoyo_put_number_union(&entry->mode); |
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tomoyo_put_number_union(&entry->major); |
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tomoyo_put_number_union(&entry->minor); |
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} |
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break; |
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case TOMOYO_TYPE_MOUNT_ACL: |
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{ |
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struct tomoyo_mount_acl *entry |
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= container_of(acl, typeof(*entry), head); |
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tomoyo_put_name_union(&entry->dev_name); |
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tomoyo_put_name_union(&entry->dir_name); |
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tomoyo_put_name_union(&entry->fs_type); |
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tomoyo_put_number_union(&entry->flags); |
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} |
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break; |
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case TOMOYO_TYPE_ENV_ACL: |
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{ |
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struct tomoyo_env_acl *entry = |
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container_of(acl, typeof(*entry), head); |
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tomoyo_put_name(entry->env); |
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} |
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break; |
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case TOMOYO_TYPE_INET_ACL: |
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{ |
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struct tomoyo_inet_acl *entry = |
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container_of(acl, typeof(*entry), head); |
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tomoyo_put_group(entry->address.group); |
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tomoyo_put_number_union(&entry->port); |
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} |
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break; |
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case TOMOYO_TYPE_UNIX_ACL: |
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{ |
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struct tomoyo_unix_acl *entry = |
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container_of(acl, typeof(*entry), head); |
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tomoyo_put_name_union(&entry->name); |
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} |
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break; |
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case TOMOYO_TYPE_MANUAL_TASK_ACL: |
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{ |
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struct tomoyo_task_acl *entry = |
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container_of(acl, typeof(*entry), head); |
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tomoyo_put_name(entry->domainname); |
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} |
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break; |
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} |
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} |
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/** |
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* tomoyo_del_domain - Delete members in "struct tomoyo_domain_info". |
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* |
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* @element: Pointer to "struct list_head". |
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* |
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* Returns nothing. |
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* |
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* Caller holds tomoyo_policy_lock mutex. |
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*/ |
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static inline void tomoyo_del_domain(struct list_head *element) |
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{ |
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struct tomoyo_domain_info *domain = |
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container_of(element, typeof(*domain), list); |
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struct tomoyo_acl_info *acl; |
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struct tomoyo_acl_info *tmp; |
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/* |
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* Since this domain is referenced from neither |
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* "struct tomoyo_io_buffer" nor "struct cred"->security, we can delete |
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* elements without checking for is_deleted flag. |
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*/ |
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list_for_each_entry_safe(acl, tmp, &domain->acl_info_list, list) { |
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tomoyo_del_acl(&acl->list); |
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tomoyo_memory_free(acl); |
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} |
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tomoyo_put_name(domain->domainname); |
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} |
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/** |
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* tomoyo_del_condition - Delete members in "struct tomoyo_condition". |
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* |
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* @element: Pointer to "struct list_head". |
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* |
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* Returns nothing. |
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*/ |
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void tomoyo_del_condition(struct list_head *element) |
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{ |
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struct tomoyo_condition *cond = container_of(element, typeof(*cond), |
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head.list); |
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const u16 condc = cond->condc; |
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const u16 numbers_count = cond->numbers_count; |
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const u16 names_count = cond->names_count; |
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const u16 argc = cond->argc; |
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const u16 envc = cond->envc; |
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unsigned int i; |
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const struct tomoyo_condition_element *condp |
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= (const struct tomoyo_condition_element *) (cond + 1); |
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struct tomoyo_number_union *numbers_p |
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= (struct tomoyo_number_union *) (condp + condc); |
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struct tomoyo_name_union *names_p |
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= (struct tomoyo_name_union *) (numbers_p + numbers_count); |
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const struct tomoyo_argv *argv |
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= (const struct tomoyo_argv *) (names_p + names_count); |
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const struct tomoyo_envp *envp |
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= (const struct tomoyo_envp *) (argv + argc); |
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for (i = 0; i < numbers_count; i++) |
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tomoyo_put_number_union(numbers_p++); |
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for (i = 0; i < names_count; i++) |
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tomoyo_put_name_union(names_p++); |
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for (i = 0; i < argc; argv++, i++) |
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tomoyo_put_name(argv->value); |
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for (i = 0; i < envc; envp++, i++) { |
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tomoyo_put_name(envp->name); |
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tomoyo_put_name(envp->value); |
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} |
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} |
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/** |
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* tomoyo_del_name - Delete members in "struct tomoyo_name". |
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* |
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* @element: Pointer to "struct list_head". |
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* |
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* Returns nothing. |
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*/ |
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static inline void tomoyo_del_name(struct list_head *element) |
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{ |
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/* Nothing to do. */ |
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} |
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/** |
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* tomoyo_del_path_group - Delete members in "struct tomoyo_path_group". |
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* |
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* @element: Pointer to "struct list_head". |
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* |
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* Returns nothing. |
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*/ |
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static inline void tomoyo_del_path_group(struct list_head *element) |
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{ |
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struct tomoyo_path_group *member = |
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container_of(element, typeof(*member), head.list); |
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tomoyo_put_name(member->member_name); |
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} |
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/** |
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* tomoyo_del_group - Delete "struct tomoyo_group". |
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* |
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* @element: Pointer to "struct list_head". |
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* |
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* Returns nothing. |
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*/ |
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static inline void tomoyo_del_group(struct list_head *element) |
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{ |
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struct tomoyo_group *group = |
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container_of(element, typeof(*group), head.list); |
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tomoyo_put_name(group->group_name); |
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} |
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/** |
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* tomoyo_del_address_group - Delete members in "struct tomoyo_address_group". |
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* |
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* @element: Pointer to "struct list_head". |
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* |
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* Returns nothing. |
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*/ |
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static inline void tomoyo_del_address_group(struct list_head *element) |
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{ |
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/* Nothing to do. */ |
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} |
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/** |
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* tomoyo_del_number_group - Delete members in "struct tomoyo_number_group". |
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* |
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* @element: Pointer to "struct list_head". |
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* |
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* Returns nothing. |
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*/ |
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static inline void tomoyo_del_number_group(struct list_head *element) |
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{ |
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/* Nothing to do. */ |
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} |
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/** |
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* tomoyo_try_to_gc - Try to kfree() an entry. |
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* |
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* @type: One of values in "enum tomoyo_policy_id". |
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* @element: Pointer to "struct list_head". |
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* |
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* Returns nothing. |
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* |
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* Caller holds tomoyo_policy_lock mutex. |
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*/ |
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static void tomoyo_try_to_gc(const enum tomoyo_policy_id type, |
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struct list_head *element) |
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{ |
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/* |
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* __list_del_entry() guarantees that the list element became no longer |
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* reachable from the list which the element was originally on (e.g. |
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* tomoyo_domain_list). Also, synchronize_srcu() guarantees that the |
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* list element became no longer referenced by syscall users. |
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*/ |
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__list_del_entry(element); |
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mutex_unlock(&tomoyo_policy_lock); |
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synchronize_srcu(&tomoyo_ss); |
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/* |
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* However, there are two users which may still be using the list |
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* element. We need to defer until both users forget this element. |
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* |
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* Don't kfree() until "struct tomoyo_io_buffer"->r.{domain,group,acl} |
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* and "struct tomoyo_io_buffer"->w.domain forget this element. |
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*/ |
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if (tomoyo_struct_used_by_io_buffer(element)) |
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goto reinject; |
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switch (type) { |
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case TOMOYO_ID_TRANSITION_CONTROL: |
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tomoyo_del_transition_control(element); |
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break; |
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case TOMOYO_ID_MANAGER: |
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tomoyo_del_manager(element); |
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break; |
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case TOMOYO_ID_AGGREGATOR: |
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tomoyo_del_aggregator(element); |
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break; |
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case TOMOYO_ID_GROUP: |
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tomoyo_del_group(element); |
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break; |
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case TOMOYO_ID_PATH_GROUP: |
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tomoyo_del_path_group(element); |
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break; |
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case TOMOYO_ID_ADDRESS_GROUP: |
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tomoyo_del_address_group(element); |
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break; |
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case TOMOYO_ID_NUMBER_GROUP: |
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tomoyo_del_number_group(element); |
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break; |
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case TOMOYO_ID_CONDITION: |
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tomoyo_del_condition(element); |
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break; |
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case TOMOYO_ID_NAME: |
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/* |
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* Don't kfree() until all "struct tomoyo_io_buffer"->r.w[] |
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* forget this element. |
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*/ |
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if (tomoyo_name_used_by_io_buffer |
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(container_of(element, typeof(struct tomoyo_name), |
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head.list)->entry.name)) |
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goto reinject; |
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tomoyo_del_name(element); |
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break; |
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case TOMOYO_ID_ACL: |
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tomoyo_del_acl(element); |
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break; |
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case TOMOYO_ID_DOMAIN: |
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/* |
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* Don't kfree() until all "struct cred"->security forget this |
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* element. |
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*/ |
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if (atomic_read(&container_of |
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(element, typeof(struct tomoyo_domain_info), |
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list)->users)) |
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goto reinject; |
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break; |
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case TOMOYO_MAX_POLICY: |
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break; |
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} |
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mutex_lock(&tomoyo_policy_lock); |
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if (type == TOMOYO_ID_DOMAIN) |
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tomoyo_del_domain(element); |
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tomoyo_memory_free(element); |
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return; |
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reinject: |
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/* |
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* We can safely reinject this element here because |
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* (1) Appending list elements and removing list elements are protected |
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* by tomoyo_policy_lock mutex. |
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* (2) Only this function removes list elements and this function is |
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* exclusively executed by tomoyo_gc_mutex mutex. |
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* are true. |
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*/ |
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mutex_lock(&tomoyo_policy_lock); |
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list_add_rcu(element, element->prev); |
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} |
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|
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/** |
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* tomoyo_collect_member - Delete elements with "struct tomoyo_acl_head". |
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* |
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* @id: One of values in "enum tomoyo_policy_id". |
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* @member_list: Pointer to "struct list_head". |
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* |
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* Returns nothing. |
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*/ |
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static void tomoyo_collect_member(const enum tomoyo_policy_id id, |
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struct list_head *member_list) |
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{ |
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struct tomoyo_acl_head *member; |
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struct tomoyo_acl_head *tmp; |
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|
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list_for_each_entry_safe(member, tmp, member_list, list) { |
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if (!member->is_deleted) |
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continue; |
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member->is_deleted = TOMOYO_GC_IN_PROGRESS; |
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tomoyo_try_to_gc(id, &member->list); |
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} |
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} |
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|
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/** |
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* tomoyo_collect_acl - Delete elements in "struct tomoyo_domain_info". |
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* |
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* @list: Pointer to "struct list_head". |
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* |
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* Returns nothing. |
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*/ |
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static void tomoyo_collect_acl(struct list_head *list) |
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{ |
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struct tomoyo_acl_info *acl; |
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struct tomoyo_acl_info *tmp; |
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|
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list_for_each_entry_safe(acl, tmp, list, list) { |
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if (!acl->is_deleted) |
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continue; |
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acl->is_deleted = TOMOYO_GC_IN_PROGRESS; |
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tomoyo_try_to_gc(TOMOYO_ID_ACL, &acl->list); |
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} |
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} |
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|
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/** |
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* tomoyo_collect_entry - Try to kfree() deleted elements. |
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* |
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* Returns nothing. |
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*/ |
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static void tomoyo_collect_entry(void) |
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{ |
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int i; |
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enum tomoyo_policy_id id; |
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struct tomoyo_policy_namespace *ns; |
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|
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mutex_lock(&tomoyo_policy_lock); |
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{ |
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struct tomoyo_domain_info *domain; |
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struct tomoyo_domain_info *tmp; |
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|
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list_for_each_entry_safe(domain, tmp, &tomoyo_domain_list, |
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list) { |
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tomoyo_collect_acl(&domain->acl_info_list); |
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if (!domain->is_deleted || atomic_read(&domain->users)) |
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continue; |
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tomoyo_try_to_gc(TOMOYO_ID_DOMAIN, &domain->list); |
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} |
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} |
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list_for_each_entry(ns, &tomoyo_namespace_list, namespace_list) { |
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for (id = 0; id < TOMOYO_MAX_POLICY; id++) |
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tomoyo_collect_member(id, &ns->policy_list[id]); |
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for (i = 0; i < TOMOYO_MAX_ACL_GROUPS; i++) |
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tomoyo_collect_acl(&ns->acl_group[i]); |
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} |
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{ |
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struct tomoyo_shared_acl_head *ptr; |
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struct tomoyo_shared_acl_head *tmp; |
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|
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list_for_each_entry_safe(ptr, tmp, &tomoyo_condition_list, |
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list) { |
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if (atomic_read(&ptr->users) > 0) |
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continue; |
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atomic_set(&ptr->users, TOMOYO_GC_IN_PROGRESS); |
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tomoyo_try_to_gc(TOMOYO_ID_CONDITION, &ptr->list); |
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} |
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} |
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list_for_each_entry(ns, &tomoyo_namespace_list, namespace_list) { |
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for (i = 0; i < TOMOYO_MAX_GROUP; i++) { |
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struct list_head *list = &ns->group_list[i]; |
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struct tomoyo_group *group; |
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struct tomoyo_group *tmp; |
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|
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switch (i) { |
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case 0: |
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id = TOMOYO_ID_PATH_GROUP; |
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break; |
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case 1: |
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id = TOMOYO_ID_NUMBER_GROUP; |
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break; |
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default: |
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id = TOMOYO_ID_ADDRESS_GROUP; |
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break; |
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} |
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list_for_each_entry_safe(group, tmp, list, head.list) { |
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tomoyo_collect_member(id, &group->member_list); |
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if (!list_empty(&group->member_list) || |
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atomic_read(&group->head.users) > 0) |
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continue; |
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atomic_set(&group->head.users, |
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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) |
|
kthread_run(tomoyo_gc_thread, NULL, "GC for TOMOYO"); |
|
}
|
|
|