[PATCH] TOMOYO: Use RCU primitives for list operation

From: Tetsuo Handa
Date: Tue Oct 13 2009 - 07:40:47 EST

[PATCH] TOMOYO: Use RCU primitives for list operation

Remove down_read()/up_read() by replacing with RCU primitives.
SRCU based garbage collector will be added in the future.

Signed-off-by: Tetsuo Handa <penguin-kernel@xxxxxxxxxxxxxxxxxxx>
---
security/tomoyo/common.c | 52 ++++++++++-----------------------------------
security/tomoyo/common.h | 14 ++++++------
security/tomoyo/domain.c | 38 ++++++++++----------------------
security/tomoyo/file.c | 50 ++++++++++++++-----------------------------
security/tomoyo/realpath.c | 4 ---
5 files changed, 49 insertions(+), 109 deletions(-)

--- security-testing-2.6.orig/security/tomoyo/common.c
+++ security-testing-2.6/security/tomoyo/common.c
@@ -365,9 +365,6 @@ bool tomoyo_is_domain_def(const unsigned
*
* @domainname: The domainname to find.
*
- * Caller must call down_read(&tomoyo_domain_list_lock); or
- * down_write(&tomoyo_domain_list_lock); .
- *
* Returns pointer to "struct tomoyo_domain_info" if found, NULL otherwise.
*/
struct tomoyo_domain_info *tomoyo_find_domain(const char *domainname)
@@ -377,7 +374,7 @@ struct tomoyo_domain_info *tomoyo_find_d

name.name = domainname;
tomoyo_fill_path_info(&name);
- list_for_each_entry(domain, &tomoyo_domain_list, list) {
+ list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) {
if (!domain->is_deleted &&
!tomoyo_pathcmp(&name, domain->domainname))
return domain;
@@ -837,8 +834,7 @@ bool tomoyo_domain_quota_is_ok(struct to

if (!domain)
return true;
- down_read(&tomoyo_domain_acl_info_list_lock);
- list_for_each_entry(ptr, &domain->acl_info_list, list) {
+ list_for_each_entry_rcu(ptr, &domain->acl_info_list, list) {
if (ptr->type & TOMOYO_ACL_DELETED)
continue;
switch (tomoyo_acl_type2(ptr)) {
@@ -891,7 +887,6 @@ bool tomoyo_domain_quota_is_ok(struct to
break;
}
}
- up_read(&tomoyo_domain_acl_info_list_lock);
if (count < tomoyo_check_flags(domain, TOMOYO_MAX_ACCEPT_ENTRY))
return true;
if (!domain->quota_warned) {
@@ -1143,7 +1138,7 @@ static int tomoyo_update_manager_entry(c
if (!saved_manager)
return -ENOMEM;
down_write(&tomoyo_policy_manager_list_lock);
- list_for_each_entry(ptr, &tomoyo_policy_manager_list, list) {
+ list_for_each_entry_rcu(ptr, &tomoyo_policy_manager_list, list) {
if (ptr->manager != saved_manager)
continue;
ptr->is_deleted = is_delete;
@@ -1159,7 +1154,7 @@ static int tomoyo_update_manager_entry(c
goto out;
new_entry->manager = saved_manager;
new_entry->is_domain = is_domain;
- list_add_tail(&new_entry->list, &tomoyo_policy_manager_list);
+ list_add_tail_rcu(&new_entry->list, &tomoyo_policy_manager_list);
error = 0;
out:
up_write(&tomoyo_policy_manager_list_lock);
@@ -1199,7 +1194,6 @@ static int tomoyo_read_manager_policy(st

if (head->read_eof)
return 0;
- down_read(&tomoyo_policy_manager_list_lock);
list_for_each_cookie(pos, head->read_var2,
&tomoyo_policy_manager_list) {
struct tomoyo_policy_manager_entry *ptr;
@@ -1211,7 +1205,6 @@ static int tomoyo_read_manager_policy(st
if (!done)
break;
}
- up_read(&tomoyo_policy_manager_list_lock);
head->read_eof = done;
return 0;
}
@@ -1234,29 +1227,25 @@ static bool tomoyo_is_policy_manager(voi
return true;
if (!tomoyo_manage_by_non_root && (task->cred->uid || task->cred->euid))
return false;
- down_read(&tomoyo_policy_manager_list_lock);
- list_for_each_entry(ptr, &tomoyo_policy_manager_list, list) {
+ list_for_each_entry_rcu(ptr, &tomoyo_policy_manager_list, list) {
if (!ptr->is_deleted && ptr->is_domain
&& !tomoyo_pathcmp(domainname, ptr->manager)) {
found = true;
break;
}
}
- up_read(&tomoyo_policy_manager_list_lock);
if (found)
return true;
exe = tomoyo_get_exe();
if (!exe)
return false;
- down_read(&tomoyo_policy_manager_list_lock);
- list_for_each_entry(ptr, &tomoyo_policy_manager_list, list) {
+ list_for_each_entry_rcu(ptr, &tomoyo_policy_manager_list, list) {
if (!ptr->is_deleted && !ptr->is_domain
&& !strcmp(exe, ptr->manager->name)) {
found = true;
break;
}
}
- up_read(&tomoyo_policy_manager_list_lock);
if (!found) { /* Reduce error messages. */
static pid_t last_pid;
const pid_t pid = current->pid;
@@ -1292,11 +1281,8 @@ static bool tomoyo_is_select_one(struct
domain = tomoyo_real_domain(p);
read_unlock(&tasklist_lock);
} else if (!strncmp(data, "domain=", 7)) {
- if (tomoyo_is_domain_def(data + 7)) {
- down_read(&tomoyo_domain_list_lock);
+ if (tomoyo_is_domain_def(data + 7))
domain = tomoyo_find_domain(data + 7);
- up_read(&tomoyo_domain_list_lock);
- }
} else
return false;
head->write_var1 = domain;
@@ -1310,13 +1296,11 @@ static bool tomoyo_is_select_one(struct
if (domain) {
struct tomoyo_domain_info *d;
head->read_var1 = NULL;
- down_read(&tomoyo_domain_list_lock);
- list_for_each_entry(d, &tomoyo_domain_list, list) {
+ list_for_each_entry_rcu(d, &tomoyo_domain_list, list) {
if (d == domain)
break;
head->read_var1 = &d->list;
}
- up_read(&tomoyo_domain_list_lock);
head->read_var2 = NULL;
head->read_bit = 0;
head->read_step = 0;
@@ -1342,7 +1326,7 @@ static int tomoyo_delete_domain(char *do
tomoyo_fill_path_info(&name);
down_write(&tomoyo_domain_list_lock);
/* Is there an active domain? */
- list_for_each_entry(domain, &tomoyo_domain_list, list) {
+ list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) {
/* Never delete tomoyo_kernel_domain */
if (domain == &tomoyo_kernel_domain)
continue;
@@ -1384,11 +1368,9 @@ static int tomoyo_write_domain_policy(st
domain = NULL;
if (is_delete)
tomoyo_delete_domain(data);
- else if (is_select) {
- down_read(&tomoyo_domain_list_lock);
+ else if (is_select)
domain = tomoyo_find_domain(data);
- up_read(&tomoyo_domain_list_lock);
- } else
+ else
domain = tomoyo_find_or_assign_new_domain(data, 0);
head->write_var1 = domain;
return 0;
@@ -1544,7 +1526,6 @@ static int tomoyo_read_domain_policy(str
return 0;
if (head->read_step == 0)
head->read_step = 1;
- down_read(&tomoyo_domain_list_lock);
list_for_each_cookie(dpos, head->read_var1, &tomoyo_domain_list) {
struct tomoyo_domain_info *domain;
const char *quota_exceeded = "";
@@ -1577,7 +1558,6 @@ acl_loop:
if (head->read_step == 3)
goto tail_mark;
/* Print ACL entries in the domain. */
- down_read(&tomoyo_domain_acl_info_list_lock);
list_for_each_cookie(apos, head->read_var2,
&domain->acl_info_list) {
struct tomoyo_acl_info *ptr
@@ -1587,7 +1567,6 @@ acl_loop:
if (!done)
break;
}
- up_read(&tomoyo_domain_acl_info_list_lock);
if (!done)
break;
head->read_step = 3;
@@ -1599,7 +1578,6 @@ tail_mark:
if (head->read_single_domain)
break;
}
- up_read(&tomoyo_domain_list_lock);
head->read_eof = done;
return 0;
}
@@ -1626,9 +1604,7 @@ static int tomoyo_write_domain_profile(s
if (!cp)
return -EINVAL;
*cp = '\0';
- down_read(&tomoyo_domain_list_lock);
domain = tomoyo_find_domain(cp + 1);
- up_read(&tomoyo_domain_list_lock);
if (strict_strtoul(data, 10, &profile))
return -EINVAL;
if (domain && profile < TOMOYO_MAX_PROFILES
@@ -1658,7 +1634,6 @@ static int tomoyo_read_domain_profile(st

if (head->read_eof)
return 0;
- down_read(&tomoyo_domain_list_lock);
list_for_each_cookie(pos, head->read_var1, &tomoyo_domain_list) {
struct tomoyo_domain_info *domain;
domain = list_entry(pos, struct tomoyo_domain_info, list);
@@ -1669,7 +1644,6 @@ static int tomoyo_read_domain_profile(st
if (!done)
break;
}
- up_read(&tomoyo_domain_list_lock);
head->read_eof = done;
return 0;
}
@@ -1889,15 +1863,13 @@ void tomoyo_load_policy(const char *file
tomoyo_policy_loaded = true;
{ /* Check all profiles currently assigned to domains are defined. */
struct tomoyo_domain_info *domain;
- down_read(&tomoyo_domain_list_lock);
- list_for_each_entry(domain, &tomoyo_domain_list, list) {
+ list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) {
const u8 profile = domain->profile;
if (tomoyo_profile_ptr[profile])
continue;
panic("Profile %u (used by '%s') not defined.\n",
profile, domain->domainname->name);
}
- up_read(&tomoyo_domain_list_lock);
}
}

--- security-testing-2.6.orig/security/tomoyo/common.h
+++ security-testing-2.6/security/tomoyo/common.h
@@ -442,16 +442,16 @@ extern struct tomoyo_domain_info tomoyo_
* @cookie: the &struct list_head to use as a cookie.
* @head: the head for your list.
*
- * Same with list_for_each() except that this primitive uses @cookie
+ * Same with list_for_each_rcu() except that this primitive uses @cookie
* so that we can continue iteration.
* @cookie must be NULL when iteration starts, and @cookie will become
* NULL when iteration finishes.
*/
-#define list_for_each_cookie(pos, cookie, head) \
- for (({ if (!cookie) \
- cookie = head; }), \
- pos = (cookie)->next; \
- prefetch(pos->next), pos != (head) || ((cookie) = NULL); \
- (cookie) = pos, pos = pos->next)
+#define list_for_each_cookie(pos, cookie, head) \
+ for (({ if (!cookie) \
+ cookie = head; }), \
+ pos = rcu_dereference((cookie)->next); \
+ prefetch(pos->next), pos != (head) || ((cookie) = NULL); \
+ (cookie) = pos, pos = rcu_dereference(pos->next))

#endif /* !defined(_SECURITY_TOMOYO_COMMON_H) */
--- security-testing-2.6.orig/security/tomoyo/domain.c
+++ security-testing-2.6/security/tomoyo/domain.c
@@ -246,7 +246,7 @@ static int tomoyo_update_domain_initiali
if (!saved_program)
return -ENOMEM;
down_write(&tomoyo_domain_initializer_list_lock);
- list_for_each_entry(ptr, &tomoyo_domain_initializer_list, list) {
+ 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)
@@ -266,7 +266,7 @@ static int tomoyo_update_domain_initiali
new_entry->program = saved_program;
new_entry->is_not = is_not;
new_entry->is_last_name = is_last_name;
- list_add_tail(&new_entry->list, &tomoyo_domain_initializer_list);
+ list_add_tail_rcu(&new_entry->list, &tomoyo_domain_initializer_list);
error = 0;
out:
up_write(&tomoyo_domain_initializer_list_lock);
@@ -285,7 +285,6 @@ bool tomoyo_read_domain_initializer_poli
struct list_head *pos;
bool done = true;

- down_read(&tomoyo_domain_initializer_list_lock);
list_for_each_cookie(pos, head->read_var2,
&tomoyo_domain_initializer_list) {
const char *no;
@@ -308,7 +307,6 @@ bool tomoyo_read_domain_initializer_poli
if (!done)
break;
}
- up_read(&tomoyo_domain_initializer_list_lock);
return done;
}

@@ -355,8 +353,7 @@ static bool tomoyo_is_domain_initializer
struct tomoyo_domain_initializer_entry *ptr;
bool flag = false;

- down_read(&tomoyo_domain_initializer_list_lock);
- list_for_each_entry(ptr, &tomoyo_domain_initializer_list, list) {
+ list_for_each_entry_rcu(ptr, &tomoyo_domain_initializer_list, list) {
if (ptr->is_deleted)
continue;
if (ptr->domainname) {
@@ -376,7 +373,6 @@ static bool tomoyo_is_domain_initializer
}
flag = true;
}
- up_read(&tomoyo_domain_initializer_list_lock);
return flag;
}

@@ -459,7 +455,7 @@ static int tomoyo_update_domain_keeper_e
if (!saved_domainname)
return -ENOMEM;
down_write(&tomoyo_domain_keeper_list_lock);
- list_for_each_entry(ptr, &tomoyo_domain_keeper_list, list) {
+ 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)
@@ -479,7 +475,7 @@ static int tomoyo_update_domain_keeper_e
new_entry->program = saved_program;
new_entry->is_not = is_not;
new_entry->is_last_name = is_last_name;
- list_add_tail(&new_entry->list, &tomoyo_domain_keeper_list);
+ list_add_tail_rcu(&new_entry->list, &tomoyo_domain_keeper_list);
error = 0;
out:
up_write(&tomoyo_domain_keeper_list_lock);
@@ -519,7 +515,6 @@ bool tomoyo_read_domain_keeper_policy(st
struct list_head *pos;
bool done = true;

- down_read(&tomoyo_domain_keeper_list_lock);
list_for_each_cookie(pos, head->read_var2,
&tomoyo_domain_keeper_list) {
struct tomoyo_domain_keeper_entry *ptr;
@@ -542,7 +537,6 @@ bool tomoyo_read_domain_keeper_policy(st
if (!done)
break;
}
- up_read(&tomoyo_domain_keeper_list_lock);
return done;
}

@@ -563,8 +557,7 @@ static bool tomoyo_is_domain_keeper(cons
struct tomoyo_domain_keeper_entry *ptr;
bool flag = false;

- down_read(&tomoyo_domain_keeper_list_lock);
- list_for_each_entry(ptr, &tomoyo_domain_keeper_list, list) {
+ list_for_each_entry_rcu(ptr, &tomoyo_domain_keeper_list, list) {
if (ptr->is_deleted)
continue;
if (!ptr->is_last_name) {
@@ -582,7 +575,6 @@ static bool tomoyo_is_domain_keeper(cons
}
flag = true;
}
- up_read(&tomoyo_domain_keeper_list_lock);
return flag;
}

@@ -646,7 +638,7 @@ static int tomoyo_update_alias_entry(con
if (!saved_original_name || !saved_aliased_name)
return -ENOMEM;
down_write(&tomoyo_alias_list_lock);
- list_for_each_entry(ptr, &tomoyo_alias_list, list) {
+ list_for_each_entry_rcu(ptr, &tomoyo_alias_list, list) {
if (ptr->original_name != saved_original_name ||
ptr->aliased_name != saved_aliased_name)
continue;
@@ -663,7 +655,7 @@ static int tomoyo_update_alias_entry(con
goto out;
new_entry->original_name = saved_original_name;
new_entry->aliased_name = saved_aliased_name;
- list_add_tail(&new_entry->list, &tomoyo_alias_list);
+ list_add_tail_rcu(&new_entry->list, &tomoyo_alias_list);
error = 0;
out:
up_write(&tomoyo_alias_list_lock);
@@ -682,7 +674,6 @@ bool tomoyo_read_alias_policy(struct tom
struct list_head *pos;
bool done = true;

- down_read(&tomoyo_alias_list_lock);
list_for_each_cookie(pos, head->read_var2, &tomoyo_alias_list) {
struct tomoyo_alias_entry *ptr;

@@ -695,7 +686,6 @@ bool tomoyo_read_alias_policy(struct tom
if (!done)
break;
}
- up_read(&tomoyo_alias_list_lock);
return done;
}

@@ -742,7 +732,7 @@ struct tomoyo_domain_info *tomoyo_find_o
if (!saved_domainname)
goto out;
/* Can I reuse memory of deleted domain? */
- list_for_each_entry(domain, &tomoyo_domain_list, list) {
+ list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) {
struct task_struct *p;
struct tomoyo_acl_info *ptr;
bool flag;
@@ -760,7 +750,7 @@ struct tomoyo_domain_info *tomoyo_find_o
read_unlock(&tasklist_lock);
if (flag)
continue;
- list_for_each_entry(ptr, &domain->acl_info_list, list) {
+ list_for_each_entry_rcu(ptr, &domain->acl_info_list, list) {
ptr->type |= TOMOYO_ACL_DELETED;
}
tomoyo_set_domain_flag(domain, true, domain->flags);
@@ -776,7 +766,7 @@ struct tomoyo_domain_info *tomoyo_find_o
INIT_LIST_HEAD(&domain->acl_info_list);
domain->domainname = saved_domainname;
domain->profile = profile;
- list_add_tail(&domain->list, &tomoyo_domain_list);
+ list_add_tail_rcu(&domain->list, &tomoyo_domain_list);
}
out:
up_write(&tomoyo_domain_list_lock);
@@ -849,8 +839,7 @@ int tomoyo_find_next_domain(struct linux
if (tomoyo_pathcmp(&r, &s)) {
struct tomoyo_alias_entry *ptr;
/* Is this program allowed to be called via symbolic links? */
- down_read(&tomoyo_alias_list_lock);
- list_for_each_entry(ptr, &tomoyo_alias_list, list) {
+ list_for_each_entry_rcu(ptr, &tomoyo_alias_list, list) {
if (ptr->is_deleted ||
tomoyo_pathcmp(&r, ptr->original_name) ||
tomoyo_pathcmp(&s, ptr->aliased_name))
@@ -861,7 +850,6 @@ int tomoyo_find_next_domain(struct linux
tomoyo_fill_path_info(&r);
break;
}
- up_read(&tomoyo_alias_list_lock);
}

/* Check execute permission. */
@@ -892,9 +880,7 @@ int tomoyo_find_next_domain(struct linux
}
if (domain || strlen(new_domain_name) >= TOMOYO_MAX_PATHNAME_LEN)
goto done;
- down_read(&tomoyo_domain_list_lock);
domain = tomoyo_find_domain(new_domain_name);
- up_read(&tomoyo_domain_list_lock);
if (domain)
goto done;
if (is_enforce)
--- security-testing-2.6.orig/security/tomoyo/file.c
+++ security-testing-2.6/security/tomoyo/file.c
@@ -220,7 +220,7 @@ static int tomoyo_update_globally_readab
if (!saved_filename)
return -ENOMEM;
down_write(&tomoyo_globally_readable_list_lock);
- list_for_each_entry(ptr, &tomoyo_globally_readable_list, list) {
+ list_for_each_entry_rcu(ptr, &tomoyo_globally_readable_list, list) {
if (ptr->filename != saved_filename)
continue;
ptr->is_deleted = is_delete;
@@ -235,7 +235,7 @@ static int tomoyo_update_globally_readab
if (!new_entry)
goto out;
new_entry->filename = saved_filename;
- list_add_tail(&new_entry->list, &tomoyo_globally_readable_list);
+ list_add_tail_rcu(&new_entry->list, &tomoyo_globally_readable_list);
error = 0;
out:
up_write(&tomoyo_globally_readable_list_lock);
@@ -254,15 +254,13 @@ static bool tomoyo_is_globally_readable_
{
struct tomoyo_globally_readable_file_entry *ptr;
bool found = false;
- down_read(&tomoyo_globally_readable_list_lock);
- list_for_each_entry(ptr, &tomoyo_globally_readable_list, list) {
+ list_for_each_entry_rcu(ptr, &tomoyo_globally_readable_list, list) {
if (!ptr->is_deleted &&
tomoyo_path_matches_pattern(filename, ptr->filename)) {
found = true;
break;
}
}
- up_read(&tomoyo_globally_readable_list_lock);
return found;
}

@@ -291,7 +289,6 @@ bool tomoyo_read_globally_readable_polic
struct list_head *pos;
bool done = true;

- down_read(&tomoyo_globally_readable_list_lock);
list_for_each_cookie(pos, head->read_var2,
&tomoyo_globally_readable_list) {
struct tomoyo_globally_readable_file_entry *ptr;
@@ -305,7 +302,6 @@ bool tomoyo_read_globally_readable_polic
if (!done)
break;
}
- up_read(&tomoyo_globally_readable_list_lock);
return done;
}

@@ -363,7 +359,7 @@ static int tomoyo_update_file_pattern_en
if (!saved_pattern)
return -ENOMEM;
down_write(&tomoyo_pattern_list_lock);
- list_for_each_entry(ptr, &tomoyo_pattern_list, list) {
+ list_for_each_entry_rcu(ptr, &tomoyo_pattern_list, list) {
if (saved_pattern != ptr->pattern)
continue;
ptr->is_deleted = is_delete;
@@ -378,7 +374,7 @@ static int tomoyo_update_file_pattern_en
if (!new_entry)
goto out;
new_entry->pattern = saved_pattern;
- list_add_tail(&new_entry->list, &tomoyo_pattern_list);
+ list_add_tail_rcu(&new_entry->list, &tomoyo_pattern_list);
error = 0;
out:
up_write(&tomoyo_pattern_list_lock);
@@ -398,8 +394,7 @@ tomoyo_get_file_pattern(const struct tom
struct tomoyo_pattern_entry *ptr;
const struct tomoyo_path_info *pattern = NULL;

- down_read(&tomoyo_pattern_list_lock);
- list_for_each_entry(ptr, &tomoyo_pattern_list, list) {
+ list_for_each_entry_rcu(ptr, &tomoyo_pattern_list, list) {
if (ptr->is_deleted)
continue;
if (!tomoyo_path_matches_pattern(filename, ptr->pattern))
@@ -412,7 +407,6 @@ tomoyo_get_file_pattern(const struct tom
break;
}
}
- up_read(&tomoyo_pattern_list_lock);
if (pattern)
filename = pattern;
return filename;
@@ -443,7 +437,6 @@ bool tomoyo_read_file_pattern(struct tom
struct list_head *pos;
bool done = true;

- down_read(&tomoyo_pattern_list_lock);
list_for_each_cookie(pos, head->read_var2, &tomoyo_pattern_list) {
struct tomoyo_pattern_entry *ptr;
ptr = list_entry(pos, struct tomoyo_pattern_entry, list);
@@ -454,7 +447,6 @@ bool tomoyo_read_file_pattern(struct tom
if (!done)
break;
}
- up_read(&tomoyo_pattern_list_lock);
return done;
}

@@ -511,7 +503,7 @@ static int tomoyo_update_no_rewrite_entr
if (!saved_pattern)
return -ENOMEM;
down_write(&tomoyo_no_rewrite_list_lock);
- list_for_each_entry(ptr, &tomoyo_no_rewrite_list, list) {
+ list_for_each_entry_rcu(ptr, &tomoyo_no_rewrite_list, list) {
if (ptr->pattern != saved_pattern)
continue;
ptr->is_deleted = is_delete;
@@ -526,7 +518,7 @@ static int tomoyo_update_no_rewrite_entr
if (!new_entry)
goto out;
new_entry->pattern = saved_pattern;
- list_add_tail(&new_entry->list, &tomoyo_no_rewrite_list);
+ list_add_tail_rcu(&new_entry->list, &tomoyo_no_rewrite_list);
error = 0;
out:
up_write(&tomoyo_no_rewrite_list_lock);
@@ -546,8 +538,7 @@ static bool tomoyo_is_no_rewrite_file(co
struct tomoyo_no_rewrite_entry *ptr;
bool found = false;

- down_read(&tomoyo_no_rewrite_list_lock);
- list_for_each_entry(ptr, &tomoyo_no_rewrite_list, list) {
+ list_for_each_entry_rcu(ptr, &tomoyo_no_rewrite_list, list) {
if (ptr->is_deleted)
continue;
if (!tomoyo_path_matches_pattern(filename, ptr->pattern))
@@ -555,7 +546,6 @@ static bool tomoyo_is_no_rewrite_file(co
found = true;
break;
}
- up_read(&tomoyo_no_rewrite_list_lock);
return found;
}

@@ -584,7 +574,6 @@ bool tomoyo_read_no_rewrite_policy(struc
struct list_head *pos;
bool done = true;

- down_read(&tomoyo_no_rewrite_list_lock);
list_for_each_cookie(pos, head->read_var2, &tomoyo_no_rewrite_list) {
struct tomoyo_no_rewrite_entry *ptr;
ptr = list_entry(pos, struct tomoyo_no_rewrite_entry, list);
@@ -595,7 +584,6 @@ bool tomoyo_read_no_rewrite_policy(struc
if (!done)
break;
}
- up_read(&tomoyo_no_rewrite_list_lock);
return done;
}

@@ -661,8 +649,7 @@ static int tomoyo_check_single_path_acl2
struct tomoyo_acl_info *ptr;
int error = -EPERM;

- down_read(&tomoyo_domain_acl_info_list_lock);
- list_for_each_entry(ptr, &domain->acl_info_list, list) {
+ list_for_each_entry_rcu(ptr, &domain->acl_info_list, list) {
struct tomoyo_single_path_acl_record *acl;
if (tomoyo_acl_type2(ptr) != TOMOYO_TYPE_SINGLE_PATH_ACL)
continue;
@@ -680,7 +667,6 @@ static int tomoyo_check_single_path_acl2
error = 0;
break;
}
- up_read(&tomoyo_domain_acl_info_list_lock);
return error;
}

@@ -848,7 +834,7 @@ static int tomoyo_update_single_path_acl
down_write(&tomoyo_domain_acl_info_list_lock);
if (is_delete)
goto delete;
- list_for_each_entry(ptr, &domain->acl_info_list, list) {
+ list_for_each_entry_rcu(ptr, &domain->acl_info_list, list) {
if (tomoyo_acl_type1(ptr) != TOMOYO_TYPE_SINGLE_PATH_ACL)
continue;
acl = container_of(ptr, struct tomoyo_single_path_acl_record,
@@ -875,12 +861,12 @@ static int tomoyo_update_single_path_acl
if (perm == (1 << TOMOYO_TYPE_READ_WRITE_ACL))
acl->perm |= rw_mask;
acl->filename = saved_filename;
- list_add_tail(&acl->head.list, &domain->acl_info_list);
+ list_add_tail_rcu(&acl->head.list, &domain->acl_info_list);
error = 0;
goto out;
delete:
error = -ENOENT;
- list_for_each_entry(ptr, &domain->acl_info_list, list) {
+ list_for_each_entry_rcu(ptr, &domain->acl_info_list, list) {
if (tomoyo_acl_type2(ptr) != TOMOYO_TYPE_SINGLE_PATH_ACL)
continue;
acl = container_of(ptr, struct tomoyo_single_path_acl_record,
@@ -937,7 +923,7 @@ static int tomoyo_update_double_path_acl
down_write(&tomoyo_domain_acl_info_list_lock);
if (is_delete)
goto delete;
- list_for_each_entry(ptr, &domain->acl_info_list, list) {
+ list_for_each_entry_rcu(ptr, &domain->acl_info_list, list) {
if (tomoyo_acl_type1(ptr) != TOMOYO_TYPE_DOUBLE_PATH_ACL)
continue;
acl = container_of(ptr, struct tomoyo_double_path_acl_record,
@@ -960,12 +946,12 @@ static int tomoyo_update_double_path_acl
acl->perm = perm;
acl->filename1 = saved_filename1;
acl->filename2 = saved_filename2;
- list_add_tail(&acl->head.list, &domain->acl_info_list);
+ list_add_tail_rcu(&acl->head.list, &domain->acl_info_list);
error = 0;
goto out;
delete:
error = -ENOENT;
- list_for_each_entry(ptr, &domain->acl_info_list, list) {
+ list_for_each_entry_rcu(ptr, &domain->acl_info_list, list) {
if (tomoyo_acl_type2(ptr) != TOMOYO_TYPE_DOUBLE_PATH_ACL)
continue;
acl = container_of(ptr, struct tomoyo_double_path_acl_record,
@@ -1025,8 +1011,7 @@ static int tomoyo_check_double_path_acl(

if (!tomoyo_check_flags(domain, TOMOYO_MAC_FOR_FILE))
return 0;
- down_read(&tomoyo_domain_acl_info_list_lock);
- list_for_each_entry(ptr, &domain->acl_info_list, list) {
+ list_for_each_entry_rcu(ptr, &domain->acl_info_list, list) {
struct tomoyo_double_path_acl_record *acl;
if (tomoyo_acl_type2(ptr) != TOMOYO_TYPE_DOUBLE_PATH_ACL)
continue;
@@ -1041,7 +1026,6 @@ static int tomoyo_check_double_path_acl(
error = 0;
break;
}
- up_read(&tomoyo_domain_acl_info_list_lock);
return error;
}

--- security-testing-2.6.orig/security/tomoyo/realpath.c
+++ security-testing-2.6/security/tomoyo/realpath.c
@@ -387,11 +387,9 @@ void __init tomoyo_realpath_init(void)
INIT_LIST_HEAD(&tomoyo_name_list[i]);
INIT_LIST_HEAD(&tomoyo_kernel_domain.acl_info_list);
tomoyo_kernel_domain.domainname = tomoyo_save_name(TOMOYO_ROOT_NAME);
- list_add_tail(&tomoyo_kernel_domain.list, &tomoyo_domain_list);
- down_read(&tomoyo_domain_list_lock);
+ 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");
- up_read(&tomoyo_domain_list_lock);
}

/* Memory allocated for temporary purpose. */
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/