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authorTetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>2010-05-17 10:12:46 +0900
committerJames Morris <jmorris@namei.org>2010-08-02 15:33:39 +1000
commitc3ef1500ec833890275172c7d063333404b64d60 (patch)
tree2453368e521a1f7a00098eef06afbedb8404503d /security/tomoyo/realpath.c
parent17fcfbd9d45b57f38d40e31f9d28db53f4af5c88 (diff)
downloadlinux-c3ef1500ec833890275172c7d063333404b64d60.tar.gz
TOMOYO: Split files into some pieces.
security/tomoyo/common.c became too large to read. Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> Signed-off-by: James Morris <jmorris@namei.org>
Diffstat (limited to 'security/tomoyo/realpath.c')
-rw-r--r--security/tomoyo/realpath.c214
1 files changed, 4 insertions, 210 deletions
diff --git a/security/tomoyo/realpath.c b/security/tomoyo/realpath.c
index 3ceb1724c92..1fd685a94ad 100644
--- a/security/tomoyo/realpath.c
+++ b/security/tomoyo/realpath.c
@@ -1,19 +1,15 @@
/*
* security/tomoyo/realpath.c
*
- * Get the canonicalized absolute pathnames. The basis for TOMOYO.
- *
- * Copyright (C) 2005-2009 NTT DATA CORPORATION
- *
- * Version: 2.2.0 2009/04/01
+ * Pathname calculation functions for TOMOYO.
*
+ * Copyright (C) 2005-2010 NTT DATA CORPORATION
*/
#include <linux/types.h>
#include <linux/mount.h>
#include <linux/mnt_namespace.h>
#include <linux/fs_struct.h>
-#include <linux/hash.h>
#include <linux/magic.h>
#include <linux/slab.h>
#include "common.h"
@@ -123,7 +119,7 @@ int tomoyo_realpath_from_path2(struct path *path, char *newname,
}
}
if (error)
- printk(KERN_WARNING "tomoyo_realpath: Pathname too long.\n");
+ tomoyo_warn_oom(__func__);
return error;
}
@@ -141,6 +137,7 @@ char *tomoyo_realpath_from_path(struct path *path)
{
char *buf = kzalloc(sizeof(struct tomoyo_page_buffer), GFP_NOFS);
+ BUILD_BUG_ON(TOMOYO_MAX_PATHNAME_LEN > PATH_MAX);
BUILD_BUG_ON(sizeof(struct tomoyo_page_buffer)
<= TOMOYO_MAX_PATHNAME_LEN - 1);
if (!buf)
@@ -189,206 +186,3 @@ char *tomoyo_realpath_nofollow(const char *pathname)
}
return NULL;
}
-
-/* Memory allocated for non-string data. */
-static atomic_t tomoyo_policy_memory_size;
-/* Quota for holding policy. */
-static unsigned int tomoyo_quota_for_policy;
-
-/**
- * tomoyo_memory_ok - Check memory quota.
- *
- * @ptr: Pointer to allocated memory.
- *
- * Returns true on success, false otherwise.
- *
- * Caller holds tomoyo_policy_lock.
- * Memory pointed by @ptr will be zeroed on success.
- */
-bool tomoyo_memory_ok(void *ptr)
-{
- int allocated_len = ptr ? ksize(ptr) : 0;
- atomic_add(allocated_len, &tomoyo_policy_memory_size);
- if (ptr && (!tomoyo_quota_for_policy ||
- atomic_read(&tomoyo_policy_memory_size)
- <= tomoyo_quota_for_policy)) {
- memset(ptr, 0, allocated_len);
- return true;
- }
- printk(KERN_WARNING "ERROR: Out of memory "
- "for tomoyo_alloc_element().\n");
- if (!tomoyo_policy_loaded)
- panic("MAC Initialization failed.\n");
- return false;
-}
-
-/**
- * tomoyo_commit_ok - Check memory quota.
- *
- * @data: Data to copy from.
- * @size: Size in byte.
- *
- * Returns pointer to allocated memory on success, NULL otherwise.
- */
-void *tomoyo_commit_ok(void *data, const unsigned int size)
-{
- void *ptr = kzalloc(size, GFP_NOFS);
- if (tomoyo_memory_ok(ptr)) {
- memmove(ptr, data, size);
- memset(data, 0, size);
- return ptr;
- }
- return NULL;
-}
-
-/**
- * tomoyo_memory_free - Free memory for elements.
- *
- * @ptr: Pointer to allocated memory.
- */
-void tomoyo_memory_free(void *ptr)
-{
- atomic_sub(ksize(ptr), &tomoyo_policy_memory_size);
- kfree(ptr);
-}
-
-/*
- * tomoyo_name_list is used for holding string data used by TOMOYO.
- * Since same string data is likely used for multiple times (e.g.
- * "/lib/libc-2.5.so"), TOMOYO shares string data in the form of
- * "const struct tomoyo_path_info *".
- */
-struct list_head tomoyo_name_list[TOMOYO_MAX_HASH];
-
-/**
- * tomoyo_get_name - Allocate permanent memory for string data.
- *
- * @name: The string to store into the permernent memory.
- *
- * Returns pointer to "struct tomoyo_path_info" on success, NULL otherwise.
- */
-const struct tomoyo_path_info *tomoyo_get_name(const char *name)
-{
- struct tomoyo_name_entry *ptr;
- unsigned int hash;
- int len;
- int allocated_len;
- struct list_head *head;
-
- if (!name)
- return NULL;
- len = strlen(name) + 1;
- hash = full_name_hash((const unsigned char *) name, len - 1);
- head = &tomoyo_name_list[hash_long(hash, TOMOYO_HASH_BITS)];
- if (mutex_lock_interruptible(&tomoyo_policy_lock))
- return NULL;
- list_for_each_entry(ptr, head, list) {
- if (hash != ptr->entry.hash || strcmp(name, ptr->entry.name))
- continue;
- atomic_inc(&ptr->users);
- goto out;
- }
- ptr = kzalloc(sizeof(*ptr) + len, GFP_NOFS);
- allocated_len = ptr ? ksize(ptr) : 0;
- if (!ptr || (tomoyo_quota_for_policy &&
- atomic_read(&tomoyo_policy_memory_size) + allocated_len
- > tomoyo_quota_for_policy)) {
- kfree(ptr);
- printk(KERN_WARNING "ERROR: Out of memory "
- "for tomoyo_get_name().\n");
- if (!tomoyo_policy_loaded)
- panic("MAC Initialization failed.\n");
- ptr = NULL;
- goto out;
- }
- atomic_add(allocated_len, &tomoyo_policy_memory_size);
- ptr->entry.name = ((char *) ptr) + sizeof(*ptr);
- memmove((char *) ptr->entry.name, name, len);
- atomic_set(&ptr->users, 1);
- tomoyo_fill_path_info(&ptr->entry);
- list_add_tail(&ptr->list, head);
- out:
- mutex_unlock(&tomoyo_policy_lock);
- return ptr ? &ptr->entry : NULL;
-}
-
-/**
- * tomoyo_realpath_init - Initialize realpath related code.
- */
-void __init tomoyo_realpath_init(void)
-{
- int i;
-
- BUILD_BUG_ON(TOMOYO_MAX_PATHNAME_LEN > PATH_MAX);
- for (i = 0; i < TOMOYO_MAX_HASH; i++)
- INIT_LIST_HEAD(&tomoyo_name_list[i]);
- INIT_LIST_HEAD(&tomoyo_kernel_domain.acl_info_list);
- tomoyo_kernel_domain.domainname = tomoyo_get_name(TOMOYO_ROOT_NAME);
- /*
- * tomoyo_read_lock() is not needed because this function is
- * called before the first "delete" request.
- */
- list_add_tail_rcu(&tomoyo_kernel_domain.list, &tomoyo_domain_list);
- if (tomoyo_find_domain(TOMOYO_ROOT_NAME) != &tomoyo_kernel_domain)
- panic("Can't register tomoyo_kernel_domain");
-}
-
-unsigned int tomoyo_quota_for_query;
-unsigned int tomoyo_query_memory_size;
-
-/**
- * tomoyo_read_memory_counter - Check for memory usage in bytes.
- *
- * @head: Pointer to "struct tomoyo_io_buffer".
- *
- * Returns memory usage.
- */
-int tomoyo_read_memory_counter(struct tomoyo_io_buffer *head)
-{
- if (!head->read_eof) {
- const unsigned int policy
- = atomic_read(&tomoyo_policy_memory_size);
- const unsigned int query = tomoyo_query_memory_size;
- char buffer[64];
-
- memset(buffer, 0, sizeof(buffer));
- if (tomoyo_quota_for_policy)
- snprintf(buffer, sizeof(buffer) - 1,
- " (Quota: %10u)",
- tomoyo_quota_for_policy);
- else
- buffer[0] = '\0';
- tomoyo_io_printf(head, "Policy: %10u%s\n", policy,
- buffer);
- if (tomoyo_quota_for_query)
- snprintf(buffer, sizeof(buffer) - 1,
- " (Quota: %10u)",
- tomoyo_quota_for_query);
- else
- buffer[0] = '\0';
- tomoyo_io_printf(head, "Query lists: %10u%s\n", query,
- buffer);
- tomoyo_io_printf(head, "Total: %10u\n", policy + query);
- head->read_eof = true;
- }
- return 0;
-}
-
-/**
- * tomoyo_write_memory_quota - Set memory quota.
- *
- * @head: Pointer to "struct tomoyo_io_buffer".
- *
- * Returns 0.
- */
-int tomoyo_write_memory_quota(struct tomoyo_io_buffer *head)
-{
- char *data = head->write_buf;
- unsigned int size;
-
- if (sscanf(data, "Policy: %u", &size) == 1)
- tomoyo_quota_for_policy = size;
- else if (sscanf(data, "Query lists: %u", &size) == 1)
- tomoyo_quota_for_query = size;
- return 0;
-}