TOMOYO: Use stack memory for pending entry.
Use stack memory for pending entry to reduce kmalloc() which will be kfree()d.
Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Signed-off-by: James Morris <jmorris@namei.org>
diff --git a/security/tomoyo/common.c b/security/tomoyo/common.c
index 8f34036..62e089c 100644
--- a/security/tomoyo/common.c
+++ b/security/tomoyo/common.c
@@ -1071,46 +1071,42 @@
static int tomoyo_update_manager_entry(const char *manager,
const bool is_delete)
{
- struct tomoyo_policy_manager_entry *entry = NULL;
struct tomoyo_policy_manager_entry *ptr;
- const struct tomoyo_path_info *saved_manager;
+ struct tomoyo_policy_manager_entry e = { };
int error = is_delete ? -ENOENT : -ENOMEM;
- bool is_domain = false;
if (tomoyo_is_domain_def(manager)) {
if (!tomoyo_is_correct_domain(manager))
return -EINVAL;
- is_domain = true;
+ e.is_domain = true;
} else {
if (!tomoyo_is_correct_path(manager, 1, -1, -1))
return -EINVAL;
}
- saved_manager = tomoyo_get_name(manager);
- if (!saved_manager)
+ e.manager = tomoyo_get_name(manager);
+ if (!e.manager)
return -ENOMEM;
- if (!is_delete)
- entry = kmalloc(sizeof(*entry), GFP_NOFS);
if (mutex_lock_interruptible(&tomoyo_policy_lock))
goto out;
list_for_each_entry_rcu(ptr, &tomoyo_policy_manager_list, list) {
- if (ptr->manager != saved_manager)
+ if (ptr->manager != e.manager)
continue;
ptr->is_deleted = is_delete;
error = 0;
break;
}
- if (!is_delete && error && tomoyo_memory_ok(entry)) {
- entry->manager = saved_manager;
- saved_manager = NULL;
- entry->is_domain = is_domain;
- list_add_tail_rcu(&entry->list, &tomoyo_policy_manager_list);
- entry = NULL;
- error = 0;
+ if (!is_delete && error) {
+ struct tomoyo_policy_manager_entry *entry =
+ tomoyo_commit_ok(&e, sizeof(e));
+ if (entry) {
+ list_add_tail_rcu(&entry->list,
+ &tomoyo_policy_manager_list);
+ error = 0;
+ }
}
mutex_unlock(&tomoyo_policy_lock);
out:
- tomoyo_put_name(saved_manager);
- kfree(entry);
+ tomoyo_put_name(e.manager);
return error;
}
diff --git a/security/tomoyo/common.h b/security/tomoyo/common.h
index 52c9502..c95f486 100644
--- a/security/tomoyo/common.h
+++ b/security/tomoyo/common.h
@@ -616,6 +616,7 @@
/* Check memory quota. */
bool tomoyo_memory_ok(void *ptr);
+void *tomoyo_commit_ok(void *data, const unsigned int size);
/*
* Keep the given name on the RAM.
@@ -735,6 +736,31 @@
return task_cred_xxx(task, security);
}
+static inline bool tomoyo_is_same_domain_initializer_entry
+(const struct tomoyo_domain_initializer_entry *p1,
+ const struct tomoyo_domain_initializer_entry *p2)
+{
+ return p1->is_not == p2->is_not && p1->is_last_name == p2->is_last_name
+ && p1->domainname == p2->domainname
+ && p1->program == p2->program;
+}
+
+static inline bool tomoyo_is_same_domain_keeper_entry
+(const struct tomoyo_domain_keeper_entry *p1,
+ const struct tomoyo_domain_keeper_entry *p2)
+{
+ return p1->is_not == p2->is_not && p1->is_last_name == p2->is_last_name
+ && p1->domainname == p2->domainname
+ && p1->program == p2->program;
+}
+
+static inline bool tomoyo_is_same_alias_entry
+(const struct tomoyo_alias_entry *p1, const struct tomoyo_alias_entry *p2)
+{
+ return p1->original_name == p2->original_name &&
+ p1->aliased_name == p2->aliased_name;
+}
+
/**
* list_for_each_cookie - iterate over a list with cookie.
* @pos: the &struct list_head to use as a loop cursor.
diff --git a/security/tomoyo/domain.c b/security/tomoyo/domain.c
index a1723bb..cd8ba44 100644
--- a/security/tomoyo/domain.c
+++ b/security/tomoyo/domain.c
@@ -130,58 +130,47 @@
const bool is_not,
const bool is_delete)
{
- struct tomoyo_domain_initializer_entry *entry = NULL;
struct tomoyo_domain_initializer_entry *ptr;
- const struct tomoyo_path_info *saved_program = NULL;
- const struct tomoyo_path_info *saved_domainname = NULL;
+ struct tomoyo_domain_initializer_entry e = { .is_not = is_not };
int error = is_delete ? -ENOENT : -ENOMEM;
- bool is_last_name = false;
if (!tomoyo_is_correct_path(program, 1, -1, -1))
return -EINVAL; /* No patterns allowed. */
if (domainname) {
if (!tomoyo_is_domain_def(domainname) &&
tomoyo_is_correct_path(domainname, 1, -1, -1))
- is_last_name = true;
+ e.is_last_name = true;
else if (!tomoyo_is_correct_domain(domainname))
return -EINVAL;
- saved_domainname = tomoyo_get_name(domainname);
- if (!saved_domainname)
+ e.domainname = tomoyo_get_name(domainname);
+ if (!e.domainname)
goto out;
}
- saved_program = tomoyo_get_name(program);
- if (!saved_program)
+ e.program = tomoyo_get_name(program);
+ if (!e.program)
goto out;
- if (!is_delete)
- entry = kmalloc(sizeof(*entry), GFP_NOFS);
if (mutex_lock_interruptible(&tomoyo_policy_lock))
goto out;
list_for_each_entry_rcu(ptr, &tomoyo_domain_initializer_list, list) {
- if (ptr->is_not != is_not ||
- ptr->domainname != saved_domainname ||
- ptr->program != saved_program)
+ if (!tomoyo_is_same_domain_initializer_entry(ptr, &e))
continue;
ptr->is_deleted = is_delete;
error = 0;
break;
}
- if (!is_delete && error && tomoyo_memory_ok(entry)) {
- entry->domainname = saved_domainname;
- saved_domainname = NULL;
- entry->program = saved_program;
- saved_program = NULL;
- entry->is_not = is_not;
- entry->is_last_name = is_last_name;
- list_add_tail_rcu(&entry->list,
- &tomoyo_domain_initializer_list);
- entry = NULL;
- error = 0;
+ if (!is_delete && error) {
+ struct tomoyo_domain_initializer_entry *entry =
+ tomoyo_commit_ok(&e, sizeof(e));
+ if (entry) {
+ list_add_tail_rcu(&entry->list,
+ &tomoyo_domain_initializer_list);
+ error = 0;
+ }
}
mutex_unlock(&tomoyo_policy_lock);
out:
- tomoyo_put_name(saved_domainname);
- tomoyo_put_name(saved_program);
- kfree(entry);
+ tomoyo_put_name(e.domainname);
+ tomoyo_put_name(e.program);
return error;
}
@@ -351,57 +340,47 @@
const bool is_not,
const bool is_delete)
{
- struct tomoyo_domain_keeper_entry *entry = NULL;
struct tomoyo_domain_keeper_entry *ptr;
- const struct tomoyo_path_info *saved_domainname = NULL;
- const struct tomoyo_path_info *saved_program = NULL;
+ struct tomoyo_domain_keeper_entry e = { .is_not = is_not };
int error = is_delete ? -ENOENT : -ENOMEM;
- bool is_last_name = false;
if (!tomoyo_is_domain_def(domainname) &&
tomoyo_is_correct_path(domainname, 1, -1, -1))
- is_last_name = true;
+ e.is_last_name = true;
else if (!tomoyo_is_correct_domain(domainname))
return -EINVAL;
if (program) {
if (!tomoyo_is_correct_path(program, 1, -1, -1))
return -EINVAL;
- saved_program = tomoyo_get_name(program);
- if (!saved_program)
+ e.program = tomoyo_get_name(program);
+ if (!e.program)
goto out;
}
- saved_domainname = tomoyo_get_name(domainname);
- if (!saved_domainname)
+ e.domainname = tomoyo_get_name(domainname);
+ if (!e.domainname)
goto out;
- if (!is_delete)
- entry = kmalloc(sizeof(*entry), GFP_NOFS);
if (mutex_lock_interruptible(&tomoyo_policy_lock))
goto out;
list_for_each_entry_rcu(ptr, &tomoyo_domain_keeper_list, list) {
- if (ptr->is_not != is_not ||
- ptr->domainname != saved_domainname ||
- ptr->program != saved_program)
+ if (!tomoyo_is_same_domain_keeper_entry(ptr, &e))
continue;
ptr->is_deleted = is_delete;
error = 0;
break;
}
- if (!is_delete && error && tomoyo_memory_ok(entry)) {
- entry->domainname = saved_domainname;
- saved_domainname = NULL;
- entry->program = saved_program;
- saved_program = NULL;
- entry->is_not = is_not;
- entry->is_last_name = is_last_name;
- list_add_tail_rcu(&entry->list, &tomoyo_domain_keeper_list);
- entry = NULL;
- error = 0;
+ if (!is_delete && error) {
+ struct tomoyo_domain_keeper_entry *entry =
+ tomoyo_commit_ok(&e, sizeof(e));
+ if (entry) {
+ list_add_tail_rcu(&entry->list,
+ &tomoyo_domain_keeper_list);
+ error = 0;
+ }
}
mutex_unlock(&tomoyo_policy_lock);
out:
- tomoyo_put_name(saved_domainname);
- tomoyo_put_name(saved_program);
- kfree(entry);
+ tomoyo_put_name(e.domainname);
+ tomoyo_put_name(e.program);
return error;
}
@@ -553,45 +532,38 @@
const char *aliased_name,
const bool is_delete)
{
- struct tomoyo_alias_entry *entry = NULL;
struct tomoyo_alias_entry *ptr;
- const struct tomoyo_path_info *saved_original_name;
- const struct tomoyo_path_info *saved_aliased_name;
+ struct tomoyo_alias_entry e = { };
int error = is_delete ? -ENOENT : -ENOMEM;
if (!tomoyo_is_correct_path(original_name, 1, -1, -1) ||
!tomoyo_is_correct_path(aliased_name, 1, -1, -1))
return -EINVAL; /* No patterns allowed. */
- saved_original_name = tomoyo_get_name(original_name);
- saved_aliased_name = tomoyo_get_name(aliased_name);
- if (!saved_original_name || !saved_aliased_name)
+ e.original_name = tomoyo_get_name(original_name);
+ e.aliased_name = tomoyo_get_name(aliased_name);
+ if (!e.original_name || !e.aliased_name)
goto out;
- if (!is_delete)
- entry = kmalloc(sizeof(*entry), GFP_NOFS);
if (mutex_lock_interruptible(&tomoyo_policy_lock))
goto out;
list_for_each_entry_rcu(ptr, &tomoyo_alias_list, list) {
- if (ptr->original_name != saved_original_name ||
- ptr->aliased_name != saved_aliased_name)
+ if (!tomoyo_is_same_alias_entry(ptr, &e))
continue;
ptr->is_deleted = is_delete;
error = 0;
break;
}
- if (!is_delete && error && tomoyo_memory_ok(entry)) {
- entry->original_name = saved_original_name;
- saved_original_name = NULL;
- entry->aliased_name = saved_aliased_name;
- saved_aliased_name = NULL;
- list_add_tail_rcu(&entry->list, &tomoyo_alias_list);
- entry = NULL;
- error = 0;
+ if (!is_delete && error) {
+ struct tomoyo_alias_entry *entry =
+ tomoyo_commit_ok(&e, sizeof(e));
+ if (entry) {
+ list_add_tail_rcu(&entry->list, &tomoyo_alias_list);
+ error = 0;
+ }
}
mutex_unlock(&tomoyo_policy_lock);
out:
- tomoyo_put_name(saved_original_name);
- tomoyo_put_name(saved_aliased_name);
- kfree(entry);
+ tomoyo_put_name(e.original_name);
+ tomoyo_put_name(e.aliased_name);
return error;
}
diff --git a/security/tomoyo/file.c b/security/tomoyo/file.c
index 060bbf3..6651cac8 100644
--- a/security/tomoyo/file.c
+++ b/security/tomoyo/file.c
@@ -164,38 +164,36 @@
static int tomoyo_update_globally_readable_entry(const char *filename,
const bool is_delete)
{
- struct tomoyo_globally_readable_file_entry *entry = NULL;
struct tomoyo_globally_readable_file_entry *ptr;
- const struct tomoyo_path_info *saved_filename;
+ struct tomoyo_globally_readable_file_entry e = { };
int error = is_delete ? -ENOENT : -ENOMEM;
if (!tomoyo_is_correct_path(filename, 1, 0, -1))
return -EINVAL;
- saved_filename = tomoyo_get_name(filename);
- if (!saved_filename)
+ e.filename = tomoyo_get_name(filename);
+ if (!e.filename)
return -ENOMEM;
- if (!is_delete)
- entry = kmalloc(sizeof(*entry), GFP_NOFS);
if (mutex_lock_interruptible(&tomoyo_policy_lock))
goto out;
list_for_each_entry_rcu(ptr, &tomoyo_globally_readable_list, list) {
- if (ptr->filename != saved_filename)
+ if (ptr->filename != e.filename)
continue;
ptr->is_deleted = is_delete;
error = 0;
break;
}
- if (!is_delete && error && tomoyo_memory_ok(entry)) {
- entry->filename = saved_filename;
- saved_filename = NULL;
- list_add_tail_rcu(&entry->list, &tomoyo_globally_readable_list);
- entry = NULL;
- error = 0;
+ if (!is_delete && error) {
+ struct tomoyo_globally_readable_file_entry *entry =
+ tomoyo_commit_ok(&e, sizeof(e));
+ if (entry) {
+ list_add_tail_rcu(&entry->list,
+ &tomoyo_globally_readable_list);
+ error = 0;
+ }
}
mutex_unlock(&tomoyo_policy_lock);
out:
- tomoyo_put_name(saved_filename);
- kfree(entry);
+ tomoyo_put_name(e.filename);
return error;
}
@@ -313,38 +311,34 @@
static int tomoyo_update_file_pattern_entry(const char *pattern,
const bool is_delete)
{
- struct tomoyo_pattern_entry *entry = NULL;
struct tomoyo_pattern_entry *ptr;
- const struct tomoyo_path_info *saved_pattern;
+ struct tomoyo_pattern_entry e = { .pattern = tomoyo_get_name(pattern) };
int error = is_delete ? -ENOENT : -ENOMEM;
- saved_pattern = tomoyo_get_name(pattern);
- if (!saved_pattern)
+ if (!e.pattern)
return error;
- if (!saved_pattern->is_patterned)
+ if (!e.pattern->is_patterned)
goto out;
- if (!is_delete)
- entry = kmalloc(sizeof(*entry), GFP_NOFS);
if (mutex_lock_interruptible(&tomoyo_policy_lock))
goto out;
list_for_each_entry_rcu(ptr, &tomoyo_pattern_list, list) {
- if (saved_pattern != ptr->pattern)
+ if (e.pattern != ptr->pattern)
continue;
ptr->is_deleted = is_delete;
error = 0;
break;
}
- if (!is_delete && error && tomoyo_memory_ok(entry)) {
- entry->pattern = saved_pattern;
- saved_pattern = NULL;
- list_add_tail_rcu(&entry->list, &tomoyo_pattern_list);
- entry = NULL;
- error = 0;
+ if (!is_delete && error) {
+ struct tomoyo_pattern_entry *entry =
+ tomoyo_commit_ok(&e, sizeof(e));
+ if (entry) {
+ list_add_tail_rcu(&entry->list, &tomoyo_pattern_list);
+ error = 0;
+ }
}
mutex_unlock(&tomoyo_policy_lock);
out:
- kfree(entry);
- tomoyo_put_name(saved_pattern);
+ tomoyo_put_name(e.pattern);
return error;
}
@@ -467,38 +461,36 @@
static int tomoyo_update_no_rewrite_entry(const char *pattern,
const bool is_delete)
{
- struct tomoyo_no_rewrite_entry *entry = NULL;
struct tomoyo_no_rewrite_entry *ptr;
- const struct tomoyo_path_info *saved_pattern;
+ struct tomoyo_no_rewrite_entry e = { };
int error = is_delete ? -ENOENT : -ENOMEM;
if (!tomoyo_is_correct_path(pattern, 0, 0, 0))
return -EINVAL;
- saved_pattern = tomoyo_get_name(pattern);
- if (!saved_pattern)
+ e.pattern = tomoyo_get_name(pattern);
+ if (!e.pattern)
return error;
- if (!is_delete)
- entry = kmalloc(sizeof(*entry), GFP_NOFS);
if (mutex_lock_interruptible(&tomoyo_policy_lock))
goto out;
list_for_each_entry_rcu(ptr, &tomoyo_no_rewrite_list, list) {
- if (ptr->pattern != saved_pattern)
+ if (ptr->pattern != e.pattern)
continue;
ptr->is_deleted = is_delete;
error = 0;
break;
}
- if (!is_delete && error && tomoyo_memory_ok(entry)) {
- entry->pattern = saved_pattern;
- saved_pattern = NULL;
- list_add_tail_rcu(&entry->list, &tomoyo_no_rewrite_list);
- entry = NULL;
- error = 0;
+ if (!is_delete && error) {
+ struct tomoyo_no_rewrite_entry *entry =
+ tomoyo_commit_ok(&e, sizeof(e));
+ if (entry) {
+ list_add_tail_rcu(&entry->list,
+ &tomoyo_no_rewrite_list);
+ error = 0;
+ }
}
mutex_unlock(&tomoyo_policy_lock);
out:
- tomoyo_put_name(saved_pattern);
- kfree(entry);
+ tomoyo_put_name(e.pattern);
return error;
}
@@ -810,23 +802,26 @@
struct tomoyo_domain_info *const domain,
const bool is_delete)
{
- static const u32 rw_mask =
+ static const u32 tomoyo_rw_mask =
(1 << TOMOYO_TYPE_READ) | (1 << TOMOYO_TYPE_WRITE);
- const struct tomoyo_path_info *saved_filename;
- struct tomoyo_acl_info *ptr;
- struct tomoyo_path_acl *entry = NULL;
- int error = is_delete ? -ENOENT : -ENOMEM;
const u32 perm = 1 << type;
+ struct tomoyo_acl_info *ptr;
+ struct tomoyo_path_acl e = {
+ .head.type = TOMOYO_TYPE_PATH_ACL,
+ .perm_high = perm >> 16,
+ .perm = perm
+ };
+ int error = is_delete ? -ENOENT : -ENOMEM;
+ if (type == TOMOYO_TYPE_READ_WRITE)
+ e.perm |= tomoyo_rw_mask;
if (!domain)
return -EINVAL;
if (!tomoyo_is_correct_path(filename, 0, 0, 0))
return -EINVAL;
- saved_filename = tomoyo_get_name(filename);
- if (!saved_filename)
+ e.filename = tomoyo_get_name(filename);
+ if (!e.filename)
return -ENOMEM;
- if (!is_delete)
- entry = kmalloc(sizeof(*entry), GFP_NOFS);
if (mutex_lock_interruptible(&tomoyo_policy_lock))
goto out;
list_for_each_entry_rcu(ptr, &domain->acl_info_list, list) {
@@ -834,48 +829,42 @@
container_of(ptr, struct tomoyo_path_acl, head);
if (ptr->type != TOMOYO_TYPE_PATH_ACL)
continue;
- if (acl->filename != saved_filename)
+ if (acl->filename != e.filename)
continue;
if (is_delete) {
if (perm <= 0xFFFF)
acl->perm &= ~perm;
else
acl->perm_high &= ~(perm >> 16);
- if ((acl->perm & rw_mask) != rw_mask)
+ if ((acl->perm & tomoyo_rw_mask) != tomoyo_rw_mask)
acl->perm &= ~(1 << TOMOYO_TYPE_READ_WRITE);
else if (!(acl->perm & (1 << TOMOYO_TYPE_READ_WRITE)))
- acl->perm &= ~rw_mask;
+ acl->perm &= ~tomoyo_rw_mask;
} else {
if (perm <= 0xFFFF)
acl->perm |= perm;
else
acl->perm_high |= (perm >> 16);
- if ((acl->perm & rw_mask) == rw_mask)
+ if ((acl->perm & tomoyo_rw_mask) == tomoyo_rw_mask)
acl->perm |= 1 << TOMOYO_TYPE_READ_WRITE;
else if (acl->perm & (1 << TOMOYO_TYPE_READ_WRITE))
- acl->perm |= rw_mask;
+ acl->perm |= tomoyo_rw_mask;
}
error = 0;
break;
}
- if (!is_delete && error && tomoyo_memory_ok(entry)) {
- entry->head.type = TOMOYO_TYPE_PATH_ACL;
- if (perm <= 0xFFFF)
- entry->perm = perm;
- else
- entry->perm_high = (perm >> 16);
- if (perm == (1 << TOMOYO_TYPE_READ_WRITE))
- entry->perm |= rw_mask;
- entry->filename = saved_filename;
- saved_filename = NULL;
- list_add_tail_rcu(&entry->head.list, &domain->acl_info_list);
- entry = NULL;
- error = 0;
+ if (!is_delete && error) {
+ struct tomoyo_path_acl *entry =
+ tomoyo_commit_ok(&e, sizeof(e));
+ if (entry) {
+ list_add_tail_rcu(&entry->head.list,
+ &domain->acl_info_list);
+ error = 0;
+ }
}
mutex_unlock(&tomoyo_policy_lock);
out:
- kfree(entry);
- tomoyo_put_name(saved_filename);
+ tomoyo_put_name(e.filename);
return error;
}
@@ -897,24 +886,23 @@
struct tomoyo_domain_info *const domain,
const bool is_delete)
{
- const struct tomoyo_path_info *saved_filename1;
- const struct tomoyo_path_info *saved_filename2;
- struct tomoyo_acl_info *ptr;
- struct tomoyo_path2_acl *entry = NULL;
- int error = is_delete ? -ENOENT : -ENOMEM;
const u8 perm = 1 << type;
+ struct tomoyo_path2_acl e = {
+ .head.type = TOMOYO_TYPE_PATH2_ACL,
+ .perm = perm
+ };
+ struct tomoyo_acl_info *ptr;
+ int error = is_delete ? -ENOENT : -ENOMEM;
if (!domain)
return -EINVAL;
if (!tomoyo_is_correct_path(filename1, 0, 0, 0) ||
!tomoyo_is_correct_path(filename2, 0, 0, 0))
return -EINVAL;
- saved_filename1 = tomoyo_get_name(filename1);
- saved_filename2 = tomoyo_get_name(filename2);
- if (!saved_filename1 || !saved_filename2)
+ e.filename1 = tomoyo_get_name(filename1);
+ e.filename2 = tomoyo_get_name(filename2);
+ if (!e.filename1 || !e.filename2)
goto out;
- if (!is_delete)
- entry = kmalloc(sizeof(*entry), GFP_NOFS);
if (mutex_lock_interruptible(&tomoyo_policy_lock))
goto out;
list_for_each_entry_rcu(ptr, &domain->acl_info_list, list) {
@@ -922,8 +910,8 @@
container_of(ptr, struct tomoyo_path2_acl, head);
if (ptr->type != TOMOYO_TYPE_PATH2_ACL)
continue;
- if (acl->filename1 != saved_filename1 ||
- acl->filename2 != saved_filename2)
+ if (acl->filename1 != e.filename1 ||
+ acl->filename2 != e.filename2)
continue;
if (is_delete)
acl->perm &= ~perm;
@@ -932,22 +920,19 @@
error = 0;
break;
}
- if (!is_delete && error && tomoyo_memory_ok(entry)) {
- entry->head.type = TOMOYO_TYPE_PATH2_ACL;
- entry->perm = perm;
- entry->filename1 = saved_filename1;
- saved_filename1 = NULL;
- entry->filename2 = saved_filename2;
- saved_filename2 = NULL;
- list_add_tail_rcu(&entry->head.list, &domain->acl_info_list);
- entry = NULL;
- error = 0;
+ if (!is_delete && error) {
+ struct tomoyo_path2_acl *entry =
+ tomoyo_commit_ok(&e, sizeof(e));
+ if (entry) {
+ list_add_tail_rcu(&entry->head.list,
+ &domain->acl_info_list);
+ error = 0;
+ }
}
mutex_unlock(&tomoyo_policy_lock);
out:
- tomoyo_put_name(saved_filename1);
- tomoyo_put_name(saved_filename2);
- kfree(entry);
+ tomoyo_put_name(e.filename1);
+ tomoyo_put_name(e.filename2);
return error;
}
diff --git a/security/tomoyo/realpath.c b/security/tomoyo/realpath.c
index 62062a6..d1b96f0 100644
--- a/security/tomoyo/realpath.c
+++ b/security/tomoyo/realpath.c
@@ -223,6 +223,25 @@
}
/**
+ * 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.