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Date: Wed, 3 Jun 2009 07:51:13 +1000 (EST)
From: James Morris <jmorris@...ei.org>
To: Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>
cc: lizf@...fujitsu.com, linux-security-module@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/5] TOMOYO: Clarify lock protected section.
On Tue, 2 Jun 2009, Tetsuo Handa wrote:
> James Morris wrote:
> > The lock functions act as annotations, you don't need to add any more.
>
> I see. I'll remake patchset.
>
> Thanks.
Please send new or updates patches as new self-contained emails.
Applied to
git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/security-testing-2.6#next
> --------------------
> Subject: TOMOYO: Remove redundant markers.
>
> Remove '/***** START/STOP *****/' markers.
>
> Signed-off-by: Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
> ---
> security/tomoyo/common.c | 8 --------
> security/tomoyo/domain.c | 14 --------------
> security/tomoyo/file.c | 10 ----------
> security/tomoyo/realpath.c | 4 ----
> 4 files changed, 36 deletions(-)
>
> --- security-testing-2.6.git.orig/security/tomoyo/common.c
> +++ security-testing-2.6.git/security/tomoyo/common.c
> @@ -866,7 +866,6 @@ static struct tomoyo_profile *tomoyo_fin
>
> if (profile >= TOMOYO_MAX_PROFILES)
> return NULL;
> - /***** EXCLUSIVE SECTION START *****/
> mutex_lock(&lock);
> ptr = tomoyo_profile_ptr[profile];
> if (ptr)
> @@ -880,7 +879,6 @@ static struct tomoyo_profile *tomoyo_fin
> tomoyo_profile_ptr[profile] = ptr;
> ok:
> mutex_unlock(&lock);
> - /***** EXCLUSIVE SECTION END *****/
> return ptr;
> }
>
> @@ -1050,7 +1048,6 @@ static int tomoyo_update_manager_entry(c
> saved_manager = tomoyo_save_name(manager);
> if (!saved_manager)
> return -ENOMEM;
> - /***** EXCLUSIVE SECTION START *****/
> down_write(&tomoyo_policy_manager_list_lock);
> list_for_each_entry(ptr, &tomoyo_policy_manager_list, list) {
> if (ptr->manager != saved_manager)
> @@ -1072,7 +1069,6 @@ static int tomoyo_update_manager_entry(c
> error = 0;
> out:
> up_write(&tomoyo_policy_manager_list_lock);
> - /***** EXCLUSIVE SECTION END *****/
> return error;
> }
>
> @@ -1197,13 +1193,11 @@ static bool tomoyo_is_select_one(struct
>
> if (sscanf(data, "pid=%u", &pid) == 1) {
> struct task_struct *p;
> - /***** CRITICAL SECTION START *****/
> read_lock(&tasklist_lock);
> p = find_task_by_vpid(pid);
> if (p)
> domain = tomoyo_real_domain(p);
> read_unlock(&tasklist_lock);
> - /***** CRITICAL SECTION END *****/
> } else if (!strncmp(data, "domain=", 7)) {
> if (tomoyo_is_domain_def(data + 7)) {
> down_read(&tomoyo_domain_list_lock);
> @@ -1594,13 +1588,11 @@ static int tomoyo_read_pid(struct tomoyo
> const int pid = head->read_step;
> struct task_struct *p;
> struct tomoyo_domain_info *domain = NULL;
> - /***** CRITICAL SECTION START *****/
> read_lock(&tasklist_lock);
> p = find_task_by_vpid(pid);
> if (p)
> domain = tomoyo_real_domain(p);
> read_unlock(&tasklist_lock);
> - /***** CRITICAL SECTION END *****/
> if (domain)
> tomoyo_io_printf(head, "%d %u %s", pid, domain->profile,
> domain->domainname->name);
> --- security-testing-2.6.git.orig/security/tomoyo/domain.c
> +++ security-testing-2.6.git/security/tomoyo/domain.c
> @@ -67,14 +67,12 @@ void tomoyo_set_domain_flag(struct tomoy
> {
> /* We need to serialize because this is bitfield operation. */
> static DEFINE_SPINLOCK(lock);
> - /***** CRITICAL SECTION START *****/
> spin_lock(&lock);
> if (!is_delete)
> domain->flags |= flags;
> else
> domain->flags &= ~flags;
> spin_unlock(&lock);
> - /***** CRITICAL SECTION END *****/
> }
>
> /**
> @@ -135,7 +133,6 @@ static int tomoyo_update_domain_initiali
> saved_program = tomoyo_save_name(program);
> if (!saved_program)
> return -ENOMEM;
> - /***** EXCLUSIVE SECTION START *****/
> down_write(&tomoyo_domain_initializer_list_lock);
> list_for_each_entry(ptr, &tomoyo_domain_initializer_list, list) {
> if (ptr->is_not != is_not ||
> @@ -161,7 +158,6 @@ static int tomoyo_update_domain_initiali
> error = 0;
> out:
> up_write(&tomoyo_domain_initializer_list_lock);
> - /***** EXCLUSIVE SECTION END *****/
> return error;
> }
>
> @@ -315,7 +311,6 @@ static int tomoyo_update_domain_keeper_e
> saved_domainname = tomoyo_save_name(domainname);
> if (!saved_domainname)
> return -ENOMEM;
> - /***** EXCLUSIVE SECTION START *****/
> down_write(&tomoyo_domain_keeper_list_lock);
> list_for_each_entry(ptr, &tomoyo_domain_keeper_list, list) {
> if (ptr->is_not != is_not ||
> @@ -341,7 +336,6 @@ static int tomoyo_update_domain_keeper_e
> error = 0;
> out:
> up_write(&tomoyo_domain_keeper_list_lock);
> - /***** EXCLUSIVE SECTION END *****/
> return error;
> }
>
> @@ -476,7 +470,6 @@ static int tomoyo_update_alias_entry(con
> saved_aliased_name = tomoyo_save_name(aliased_name);
> if (!saved_original_name || !saved_aliased_name)
> return -ENOMEM;
> - /***** EXCLUSIVE SECTION START *****/
> down_write(&tomoyo_alias_list_lock);
> list_for_each_entry(ptr, &tomoyo_alias_list, list) {
> if (ptr->original_name != saved_original_name ||
> @@ -499,7 +492,6 @@ static int tomoyo_update_alias_entry(con
> error = 0;
> out:
> up_write(&tomoyo_alias_list_lock);
> - /***** EXCLUSIVE SECTION END *****/
> return error;
> }
>
> @@ -567,7 +559,6 @@ int tomoyo_delete_domain(char *domainnam
>
> name.name = domainname;
> tomoyo_fill_path_info(&name);
> - /***** EXCLUSIVE SECTION START *****/
> down_write(&tomoyo_domain_list_lock);
> /* Is there an active domain? */
> list_for_each_entry(domain, &tomoyo_domain_list, list) {
> @@ -581,7 +572,6 @@ int tomoyo_delete_domain(char *domainnam
> break;
> }
> up_write(&tomoyo_domain_list_lock);
> - /***** EXCLUSIVE SECTION END *****/
> return 0;
> }
>
> @@ -600,7 +590,6 @@ struct tomoyo_domain_info *tomoyo_find_o
> struct tomoyo_domain_info *domain = NULL;
> const struct tomoyo_path_info *saved_domainname;
>
> - /***** EXCLUSIVE SECTION START *****/
> down_write(&tomoyo_domain_list_lock);
> domain = tomoyo_find_domain(domainname);
> if (domain)
> @@ -619,7 +608,6 @@ struct tomoyo_domain_info *tomoyo_find_o
> domain->domainname != saved_domainname)
> continue;
> flag = false;
> - /***** CRITICAL SECTION START *****/
> read_lock(&tasklist_lock);
> for_each_process(p) {
> if (tomoyo_real_domain(p) != domain)
> @@ -628,7 +616,6 @@ struct tomoyo_domain_info *tomoyo_find_o
> break;
> }
> read_unlock(&tasklist_lock);
> - /***** CRITICAL SECTION END *****/
> if (flag)
> continue;
> list_for_each_entry(ptr, &domain->acl_info_list, list) {
> @@ -651,7 +638,6 @@ struct tomoyo_domain_info *tomoyo_find_o
> }
> out:
> up_write(&tomoyo_domain_list_lock);
> - /***** EXCLUSIVE SECTION END *****/
> return domain;
> }
>
> --- security-testing-2.6.git.orig/security/tomoyo/file.c
> +++ security-testing-2.6.git/security/tomoyo/file.c
> @@ -166,7 +166,6 @@ static int tomoyo_update_globally_readab
> saved_filename = tomoyo_save_name(filename);
> if (!saved_filename)
> return -ENOMEM;
> - /***** EXCLUSIVE SECTION START *****/
> down_write(&tomoyo_globally_readable_list_lock);
> list_for_each_entry(ptr, &tomoyo_globally_readable_list, list) {
> if (ptr->filename != saved_filename)
> @@ -187,7 +186,6 @@ static int tomoyo_update_globally_readab
> error = 0;
> out:
> up_write(&tomoyo_globally_readable_list_lock);
> - /***** EXCLUSIVE SECTION END *****/
> return error;
> }
>
> @@ -284,7 +282,6 @@ static int tomoyo_update_file_pattern_en
> saved_pattern = tomoyo_save_name(pattern);
> if (!saved_pattern)
> return -ENOMEM;
> - /***** EXCLUSIVE SECTION START *****/
> down_write(&tomoyo_pattern_list_lock);
> list_for_each_entry(ptr, &tomoyo_pattern_list, list) {
> if (saved_pattern != ptr->pattern)
> @@ -305,7 +302,6 @@ static int tomoyo_update_file_pattern_en
> error = 0;
> out:
> up_write(&tomoyo_pattern_list_lock);
> - /***** EXCLUSIVE SECTION END *****/
> return error;
> }
>
> @@ -407,7 +403,6 @@ static int tomoyo_update_no_rewrite_entr
> saved_pattern = tomoyo_save_name(pattern);
> if (!saved_pattern)
> return -ENOMEM;
> - /***** EXCLUSIVE SECTION START *****/
> down_write(&tomoyo_no_rewrite_list_lock);
> list_for_each_entry(ptr, &tomoyo_no_rewrite_list, list) {
> if (ptr->pattern != saved_pattern)
> @@ -428,7 +423,6 @@ static int tomoyo_update_no_rewrite_entr
> error = 0;
> out:
> up_write(&tomoyo_no_rewrite_list_lock);
> - /***** EXCLUSIVE SECTION END *****/
> return error;
> }
>
> @@ -745,7 +739,6 @@ static int tomoyo_update_single_path_acl
> saved_filename = tomoyo_save_name(filename);
> if (!saved_filename)
> return -ENOMEM;
> - /***** EXCLUSIVE SECTION START *****/
> down_write(&tomoyo_domain_acl_info_list_lock);
> if (is_delete)
> goto delete;
> @@ -800,7 +793,6 @@ static int tomoyo_update_single_path_acl
> }
> out:
> up_write(&tomoyo_domain_acl_info_list_lock);
> - /***** EXCLUSIVE SECTION END *****/
> return error;
> }
>
> @@ -836,7 +828,6 @@ static int tomoyo_update_double_path_acl
> saved_filename2 = tomoyo_save_name(filename2);
> if (!saved_filename1 || !saved_filename2)
> return -ENOMEM;
> - /***** EXCLUSIVE SECTION START *****/
> down_write(&tomoyo_domain_acl_info_list_lock);
> if (is_delete)
> goto delete;
> @@ -884,7 +875,6 @@ static int tomoyo_update_double_path_acl
> }
> out:
> up_write(&tomoyo_domain_acl_info_list_lock);
> - /***** EXCLUSIVE SECTION END *****/
> return error;
> }
>
> --- security-testing-2.6.git.orig/security/tomoyo/realpath.c
> +++ security-testing-2.6.git/security/tomoyo/realpath.c
> @@ -220,7 +220,6 @@ void *tomoyo_alloc_element(const unsigne
> = roundup(size, max(sizeof(void *), sizeof(long)));
> if (word_aligned_size > PATH_MAX)
> return NULL;
> - /***** EXCLUSIVE SECTION START *****/
> mutex_lock(&lock);
> if (buf_used_len + word_aligned_size > PATH_MAX) {
> if (!tomoyo_quota_for_elements ||
> @@ -251,7 +250,6 @@ void *tomoyo_alloc_element(const unsigne
> }
> }
> mutex_unlock(&lock);
> - /***** EXCLUSIVE SECTION END *****/
> return ptr;
> }
>
> @@ -318,7 +316,6 @@ const struct tomoyo_path_info *tomoyo_sa
> return NULL;
> }
> hash = full_name_hash((const unsigned char *) name, len - 1);
> - /***** EXCLUSIVE SECTION START *****/
> mutex_lock(&lock);
> list_for_each_entry(ptr, &tomoyo_name_list[hash % TOMOYO_MAX_HASH],
> list) {
> @@ -366,7 +363,6 @@ const struct tomoyo_path_info *tomoyo_sa
> }
> out:
> mutex_unlock(&lock);
> - /***** EXCLUSIVE SECTION END *****/
> return ptr ? &ptr->entry : NULL;
> }
>
>
--
James Morris
<jmorris@...ei.org>
--
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