Commit 9e4b50e9 authored by Tetsuo Handa's avatar Tetsuo Handa Committed by James Morris

TOMOYO: Use stack memory for pending entry.

Use stack memory for pending entry to reduce kmalloc() which will be kfree()d.
Signed-off-by: default avatarTetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Signed-off-by: default avatarJames Morris <jmorris@namei.org>
parent 83c36ccf
......@@ -1071,46 +1071,42 @@ LIST_HEAD(tomoyo_policy_manager_list);
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;
}
......
......@@ -616,6 +616,7 @@ char *tomoyo_realpath_from_path(struct path *path);
/* 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 @@ static inline struct tomoyo_domain_info *tomoyo_real_domain(struct task_struct
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.
......
......@@ -130,58 +130,47 @@ static int tomoyo_update_domain_initializer_entry(const char *domainname,
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 @@ static int tomoyo_update_domain_keeper_entry(const char *domainname,
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 @@ static int tomoyo_update_alias_entry(const char *original_name,
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;
}
......
......@@ -164,38 +164,36 @@ LIST_HEAD(tomoyo_globally_readable_list);
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 @@ LIST_HEAD(tomoyo_pattern_list);
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 @@ LIST_HEAD(tomoyo_no_rewrite_list);
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 @@ static int tomoyo_update_path_acl(const u8 type, const char *filename,
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;
const u32 perm = 1 << type;
struct tomoyo_acl_info *ptr;
struct tomoyo_path_acl *entry = NULL;
struct tomoyo_path_acl e = {
.head.type = TOMOYO_TYPE_PATH_ACL,
.perm_high = perm >> 16,
.perm = perm
};
int error = is_delete ? -ENOENT : -ENOMEM;
const u32 perm = 1 << type;
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 @@ static int tomoyo_update_path_acl(const u8 type, const char *filename,
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 @@ static int tomoyo_update_path2_acl(const u8 type, const char *filename1,
struct tomoyo_domain_info *const domain,
const bool is_delete)
{
const struct tomoyo_path_info *saved_filename1;
const struct tomoyo_path_info *saved_filename2;
const u8 perm = 1 << type;
struct tomoyo_path2_acl e = {
.head.type = TOMOYO_TYPE_PATH2_ACL,
.perm = perm
};
struct tomoyo_acl_info *ptr;
struct tomoyo_path2_acl *entry = NULL;
int error = is_delete ? -ENOENT : -ENOMEM;
const u8 perm = 1 << type;
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 @@ static int tomoyo_update_path2_acl(const u8 type, const char *filename1,
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 @@ static int tomoyo_update_path2_acl(const u8 type, const char *filename1,
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;
}
......
......@@ -222,6 +222,25 @@ bool tomoyo_memory_ok(void *ptr)
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.
*
......
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