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Date: Tue, 02 Jun 2009 10:21:04 +0800
From: Li Zefan <lizf@...fujitsu.com>
To: Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>
CC: linux-security-module@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/5] TOMOYO: Clarify lock protected section.
Tetsuo Handa wrote:
> Enclose reader section in
> /***** READER SECTION START *****/
> and
> /***** READER SECTION END *****/
> and writer section in
> /***** WRITER SECTION START *****/
> and
> /***** WRITER SECTION END *****/
> in order to avoid oversighting lock protected section.
>
This makes me a bit uncomfortable..
IMHO this seems ugly, useless, and even harmful. If it's helpful,
we'd be doing this for the whole kernel tree, which is crazy..
Or does tomoyo do this for it's special reason?
> Signed-off-by: Kentaro Takeda <takedakn@...data.co.jp>
> Signed-off-by: Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
> Signed-off-by: Toshiharu Harada <haradats@...data.co.jp>
> ---
> security/tomoyo/common.c | 30 ++++++++++++++++++++++++++++--
> security/tomoyo/domain.c | 34 ++++++++++++++++++++++++----------
> security/tomoyo/file.c | 36 ++++++++++++++++++++++++++----------
> security/tomoyo/realpath.c | 2 ++
> 4 files changed, 80 insertions(+), 22 deletions(-)
>
> --- security-testing-2.6.git.orig/security/tomoyo/common.c
> +++ security-testing-2.6.git/security/tomoyo/common.c
> @@ -706,6 +706,7 @@ static const char *tomoyo_get_exe(void)
>
> if (!mm)
> return NULL;
> + /***** READER SECTION START *****/
> down_read(&mm->mmap_sem);
> for (vma = mm->mmap; vma; vma = vma->vm_next) {
> if ((vma->vm_flags & VM_EXECUTABLE) && vma->vm_file) {
> @@ -714,6 +715,7 @@ static const char *tomoyo_get_exe(void)
> }
> }
> up_read(&mm->mmap_sem);
> + /***** READER SECTION END *****/
> return cp;
> }
>
> @@ -784,6 +786,7 @@ bool tomoyo_domain_quota_is_ok(struct to
>
> if (!domain)
> return true;
> + /***** READER SECTION START *****/
> down_read(&tomoyo_domain_acl_info_list_lock);
> list_for_each_entry(ptr, &domain->acl_info_list, list) {
> if (ptr->type & TOMOYO_ACL_DELETED)
> @@ -839,6 +842,7 @@ bool tomoyo_domain_quota_is_ok(struct to
> }
> }
> up_read(&tomoyo_domain_acl_info_list_lock);
> + /***** READER SECTION END *****/
> if (count < tomoyo_check_flags(domain, TOMOYO_MAX_ACCEPT_ENTRY))
> return true;
> if (!domain->quota_warned) {
> @@ -1053,7 +1057,7 @@ static int tomoyo_update_manager_entry(c
> return -ENOMEM;
> if (!is_delete)
> new_entry = kmalloc(sizeof(*new_entry), GFP_KERNEL);
> - /***** EXCLUSIVE SECTION START *****/
> + /***** WRITER SECTION START *****/
> down_write(&tomoyo_policy_manager_list_lock);
> list_for_each_entry(ptr, &tomoyo_policy_manager_list, list) {
> if (ptr->manager != saved_manager)
> @@ -1070,7 +1074,7 @@ static int tomoyo_update_manager_entry(c
> error = 0;
> }
> up_write(&tomoyo_policy_manager_list_lock);
> - /***** EXCLUSIVE SECTION END *****/
> + /***** WRITER SECTION END *****/
> kfree(new_entry);
> return error;
> }
> @@ -1108,6 +1112,7 @@ static int tomoyo_read_manager_policy(st
>
> if (head->read_eof)
> return 0;
> + /***** READER SECTION START *****/
> down_read(&tomoyo_policy_manager_list_lock);
> list_for_each_cookie(pos, head->read_var2,
> &tomoyo_policy_manager_list) {
> @@ -1122,6 +1127,7 @@ static int tomoyo_read_manager_policy(st
> }
> }
> up_read(&tomoyo_policy_manager_list_lock);
> + /***** READER SECTION END *****/
> head->read_eof = done;
> return 0;
> }
> @@ -1144,6 +1150,7 @@ static bool tomoyo_is_policy_manager(voi
> return true;
> if (!tomoyo_manage_by_non_root && (task->cred->uid || task->cred->euid))
> return false;
> + /***** READER SECTION START *****/
> down_read(&tomoyo_policy_manager_list_lock);
> list_for_each_entry(ptr, &tomoyo_policy_manager_list, list) {
> if (!ptr->is_deleted && ptr->is_domain
> @@ -1153,11 +1160,13 @@ static bool tomoyo_is_policy_manager(voi
> }
> }
> up_read(&tomoyo_policy_manager_list_lock);
> + /***** READER SECTION END *****/
> if (found)
> return true;
> exe = tomoyo_get_exe();
> if (!exe)
> return false;
> + /***** READER SECTION START *****/
> down_read(&tomoyo_policy_manager_list_lock);
> list_for_each_entry(ptr, &tomoyo_policy_manager_list, list) {
> if (!ptr->is_deleted && !ptr->is_domain
> @@ -1167,6 +1176,7 @@ static bool tomoyo_is_policy_manager(voi
> }
> }
> up_read(&tomoyo_policy_manager_list_lock);
> + /***** READER SECTION END *****/
> if (!found) { /* Reduce error messages. */
> static pid_t last_pid;
> const pid_t pid = current->pid;
> @@ -1205,9 +1215,11 @@ static bool tomoyo_is_select_one(struct
> /***** CRITICAL SECTION END *****/
> } else if (!strncmp(data, "domain=", 7)) {
> if (tomoyo_is_domain_def(data + 7)) {
> + /***** READER SECTION START *****/
> down_read(&tomoyo_domain_list_lock);
> domain = tomoyo_find_domain(data + 7);
> up_read(&tomoyo_domain_list_lock);
> + /***** READER SECTION END *****/
> }
> } else
> return false;
> @@ -1222,6 +1234,7 @@ static bool tomoyo_is_select_one(struct
> if (domain) {
> struct tomoyo_domain_info *d;
> head->read_var1 = NULL;
> + /***** READER SECTION START *****/
> down_read(&tomoyo_domain_list_lock);
> list_for_each_entry(d, &tomoyo_domain_list, list) {
> if (d == domain)
> @@ -1229,6 +1242,7 @@ static bool tomoyo_is_select_one(struct
> head->read_var1 = &d->list;
> }
> up_read(&tomoyo_domain_list_lock);
> + /***** READER SECTION END *****/
> head->read_var2 = NULL;
> head->read_bit = 0;
> head->read_step = 0;
> @@ -1267,9 +1281,11 @@ static int tomoyo_write_domain_policy(st
> if (is_delete)
> tomoyo_delete_domain(data);
> else if (is_select) {
> + /***** READER SECTION START *****/
> down_read(&tomoyo_domain_list_lock);
> domain = tomoyo_find_domain(data);
> up_read(&tomoyo_domain_list_lock);
> + /***** READER SECTION END *****/
> } else
> domain = tomoyo_find_or_assign_new_domain(data, 0);
> head->write_var1 = domain;
> @@ -1426,6 +1442,7 @@ static int tomoyo_read_domain_policy(str
> return 0;
> if (head->read_step == 0)
> head->read_step = 1;
> + /***** READER SECTION START *****/
> down_read(&tomoyo_domain_list_lock);
> list_for_each_cookie(dpos, head->read_var1, &tomoyo_domain_list) {
> struct tomoyo_domain_info *domain;
> @@ -1460,6 +1477,7 @@ acl_loop:
> if (head->read_step == 3)
> goto tail_mark;
> /* Print ACL entries in the domain. */
> + /***** READER SECTION START *****/
> down_read(&tomoyo_domain_acl_info_list_lock);
> list_for_each_cookie(apos, head->read_var2,
> &domain->acl_info_list) {
> @@ -1472,6 +1490,7 @@ acl_loop:
> }
> }
> up_read(&tomoyo_domain_acl_info_list_lock);
> + /***** READER SECTION END *****/
> if (!done)
> break;
> head->read_step = 3;
> @@ -1485,6 +1504,7 @@ tail_mark:
> break;
> }
> up_read(&tomoyo_domain_list_lock);
> + /***** READER SECTION END *****/
> head->read_eof = done;
> return 0;
> }
> @@ -1511,9 +1531,11 @@ static int tomoyo_write_domain_profile(s
> if (!cp)
> return -EINVAL;
> *cp = '\0';
> + /***** READER SECTION START *****/
> down_read(&tomoyo_domain_list_lock);
> domain = tomoyo_find_domain(cp + 1);
> up_read(&tomoyo_domain_list_lock);
> + /***** READER SECTION END *****/
> if (strict_strtoul(data, 10, &profile))
> return -EINVAL;
> if (domain && profile < TOMOYO_MAX_PROFILES
> @@ -1543,6 +1565,7 @@ static int tomoyo_read_domain_profile(st
>
> if (head->read_eof)
> return 0;
> + /***** READER SECTION START *****/
> down_read(&tomoyo_domain_list_lock);
> list_for_each_cookie(pos, head->read_var1, &tomoyo_domain_list) {
> struct tomoyo_domain_info *domain;
> @@ -1556,6 +1579,7 @@ static int tomoyo_read_domain_profile(st
> }
> }
> up_read(&tomoyo_domain_list_lock);
> + /***** READER SECTION END *****/
> head->read_eof = done;
> return 0;
> }
> @@ -1777,6 +1801,7 @@ 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;
> + /***** READER SECTION START *****/
> down_read(&tomoyo_domain_list_lock);
> list_for_each_entry(domain, &tomoyo_domain_list, list) {
> const u8 profile = domain->profile;
> @@ -1786,6 +1811,7 @@ void tomoyo_load_policy(const char *file
> profile, domain->domainname->name);
> }
> up_read(&tomoyo_domain_list_lock);
> + /***** READER SECTION END *****/
> }
> }
>
> --- security-testing-2.6.git.orig/security/tomoyo/domain.c
> +++ security-testing-2.6.git/security/tomoyo/domain.c
> @@ -137,7 +137,7 @@ static int tomoyo_update_domain_initiali
> return -ENOMEM;
> if (!is_delete)
> new_entry = kmalloc(sizeof(*new_entry), GFP_KERNEL);
> - /***** EXCLUSIVE SECTION START *****/
> + /***** WRITER 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 ||
> @@ -159,7 +159,7 @@ static int tomoyo_update_domain_initiali
> error = 0;
> }
> up_write(&tomoyo_domain_initializer_list_lock);
> - /***** EXCLUSIVE SECTION END *****/
> + /***** WRITER SECTION END *****/
> kfree(new_entry);
> return error;
> }
> @@ -176,6 +176,7 @@ bool tomoyo_read_domain_initializer_poli
> struct list_head *pos;
> bool done = true;
>
> + /***** READER SECTION START *****/
> down_read(&tomoyo_domain_initializer_list_lock);
> list_for_each_cookie(pos, head->read_var2,
> &tomoyo_domain_initializer_list) {
> @@ -201,6 +202,7 @@ bool tomoyo_read_domain_initializer_poli
> }
> }
> up_read(&tomoyo_domain_initializer_list_lock);
> + /***** READER SECTION END *****/
> return done;
> }
>
> @@ -247,6 +249,7 @@ static bool tomoyo_is_domain_initializer
> struct tomoyo_domain_initializer_entry *ptr;
> bool flag = false;
>
> + /***** READER SECTION START *****/
> down_read(&tomoyo_domain_initializer_list_lock);
> list_for_each_entry(ptr, &tomoyo_domain_initializer_list, list) {
> if (ptr->is_deleted)
> @@ -269,6 +272,7 @@ static bool tomoyo_is_domain_initializer
> flag = true;
> }
> up_read(&tomoyo_domain_initializer_list_lock);
> + /***** READER SECTION END *****/
> return flag;
> }
>
> @@ -316,7 +320,7 @@ static int tomoyo_update_domain_keeper_e
> return -ENOMEM;
> if (!is_delete)
> new_entry = kmalloc(sizeof(*new_entry), GFP_KERNEL);
> - /***** EXCLUSIVE SECTION START *****/
> + /***** WRITER 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 ||
> @@ -337,7 +341,7 @@ static int tomoyo_update_domain_keeper_e
> error = 0;
> }
> up_write(&tomoyo_domain_keeper_list_lock);
> - /***** EXCLUSIVE SECTION END *****/
> + /***** WRITER SECTION END *****/
> kfree(new_entry);
> return error;
> }
> @@ -375,6 +379,7 @@ bool tomoyo_read_domain_keeper_policy(st
> struct list_head *pos;
> bool done = true;
>
> + /***** READER SECTION START *****/
> down_read(&tomoyo_domain_keeper_list_lock);
> list_for_each_cookie(pos, head->read_var2,
> &tomoyo_domain_keeper_list) {
> @@ -400,6 +405,7 @@ bool tomoyo_read_domain_keeper_policy(st
> }
> }
> up_read(&tomoyo_domain_keeper_list_lock);
> + /***** READER SECTION END *****/
> return done;
> }
>
> @@ -420,6 +426,7 @@ static bool tomoyo_is_domain_keeper(cons
> struct tomoyo_domain_keeper_entry *ptr;
> bool flag = false;
>
> + /***** READER SECTION START *****/
> down_read(&tomoyo_domain_keeper_list_lock);
> list_for_each_entry(ptr, &tomoyo_domain_keeper_list, list) {
> if (ptr->is_deleted)
> @@ -440,6 +447,7 @@ static bool tomoyo_is_domain_keeper(cons
> flag = true;
> }
> up_read(&tomoyo_domain_keeper_list_lock);
> + /***** READER SECTION END *****/
> return flag;
> }
>
> @@ -475,7 +483,7 @@ static int tomoyo_update_alias_entry(con
> return -ENOMEM;
> if (!is_delete)
> new_entry = kmalloc(sizeof(*new_entry), GFP_KERNEL);
> - /***** EXCLUSIVE SECTION START *****/
> + /***** WRITER SECTION START *****/
> down_write(&tomoyo_alias_list_lock);
> list_for_each_entry(ptr, &tomoyo_alias_list, list) {
> if (ptr->original_name != saved_original_name ||
> @@ -493,7 +501,7 @@ static int tomoyo_update_alias_entry(con
> error = 0;
> }
> up_write(&tomoyo_alias_list_lock);
> - /***** EXCLUSIVE SECTION END *****/
> + /***** WRITER SECTION END *****/
> kfree(new_entry);
> return error;
> }
> @@ -510,6 +518,7 @@ bool tomoyo_read_alias_policy(struct tom
> struct list_head *pos;
> bool done = true;
>
> + /***** READER SECTION START *****/
> down_read(&tomoyo_alias_list_lock);
> list_for_each_cookie(pos, head->read_var2, &tomoyo_alias_list) {
> struct tomoyo_alias_entry *ptr;
> @@ -525,6 +534,7 @@ bool tomoyo_read_alias_policy(struct tom
> }
> }
> up_read(&tomoyo_alias_list_lock);
> + /***** READER SECTION END *****/
> return done;
> }
>
> @@ -562,7 +572,7 @@ int tomoyo_delete_domain(char *domainnam
>
> name.name = domainname;
> tomoyo_fill_path_info(&name);
> - /***** EXCLUSIVE SECTION START *****/
> + /***** WRITER SECTION START *****/
> down_write(&tomoyo_domain_list_lock);
> /* Is there an active domain? */
> list_for_each_entry(domain, &tomoyo_domain_list, list) {
> @@ -576,7 +586,7 @@ int tomoyo_delete_domain(char *domainnam
> break;
> }
> up_write(&tomoyo_domain_list_lock);
> - /***** EXCLUSIVE SECTION END *****/
> + /***** WRITER SECTION END *****/
> return 0;
> }
>
> @@ -602,7 +612,7 @@ struct tomoyo_domain_info *tomoyo_find_o
> if (!saved_domainname)
> return NULL;
> new_domain = kmalloc(sizeof(*new_domain), GFP_KERNEL);
> - /***** EXCLUSIVE SECTION START *****/
> + /***** WRITER SECTION START *****/
> down_write(&tomoyo_domain_list_lock);
> domain = tomoyo_find_domain(domainname);
> if (domain)
> @@ -649,7 +659,7 @@ struct tomoyo_domain_info *tomoyo_find_o
> }
> out:
> up_write(&tomoyo_domain_list_lock);
> - /***** EXCLUSIVE SECTION END *****/
> + /***** WRITER SECTION END *****/
> kfree(new_domain);
> return domain;
> }
> @@ -722,6 +732,7 @@ 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? */
> + /***** READER SECTION START *****/
> down_read(&tomoyo_alias_list_lock);
> list_for_each_entry(ptr, &tomoyo_alias_list, list) {
> if (ptr->is_deleted ||
> @@ -735,6 +746,7 @@ int tomoyo_find_next_domain(struct linux
> break;
> }
> up_read(&tomoyo_alias_list_lock);
> + /***** READER SECTION END *****/
> }
>
> /* Check execute permission. */
> @@ -765,9 +777,11 @@ int tomoyo_find_next_domain(struct linux
> }
> if (domain || strlen(new_domain_name) >= TOMOYO_MAX_PATHNAME_LEN)
> goto done;
> + /***** READER SECTION START *****/
> down_read(&tomoyo_domain_list_lock);
> domain = tomoyo_find_domain(new_domain_name);
> up_read(&tomoyo_domain_list_lock);
> + /***** READER SECTION END *****/
> if (domain)
> goto done;
> if (is_enforce)
> --- security-testing-2.6.git.orig/security/tomoyo/file.c
> +++ security-testing-2.6.git/security/tomoyo/file.c
> @@ -168,7 +168,7 @@ static int tomoyo_update_globally_readab
> return -ENOMEM;
> if (!is_delete)
> new_entry = kmalloc(sizeof(*new_entry), GFP_KERNEL);
> - /***** EXCLUSIVE SECTION START *****/
> + /***** WRITER SECTION START *****/
> down_write(&tomoyo_globally_readable_list_lock);
> list_for_each_entry(ptr, &tomoyo_globally_readable_list, list) {
> if (ptr->filename != saved_filename)
> @@ -184,7 +184,7 @@ static int tomoyo_update_globally_readab
> error = 0;
> }
> up_write(&tomoyo_globally_readable_list_lock);
> - /***** EXCLUSIVE SECTION END *****/
> + /***** WRITER SECTION END *****/
> kfree(new_entry);
> return error;
> }
> @@ -201,6 +201,7 @@ static bool tomoyo_is_globally_readable_
> {
> struct tomoyo_globally_readable_file_entry *ptr;
> bool found = false;
> + /***** READER SECTION START *****/
> down_read(&tomoyo_globally_readable_list_lock);
> list_for_each_entry(ptr, &tomoyo_globally_readable_list, list) {
> if (!ptr->is_deleted &&
> @@ -210,6 +211,7 @@ static bool tomoyo_is_globally_readable_
> }
> }
> up_read(&tomoyo_globally_readable_list_lock);
> + /***** READER SECTION END *****/
> return found;
> }
>
> @@ -238,6 +240,7 @@ bool tomoyo_read_globally_readable_polic
> struct list_head *pos;
> bool done = true;
>
> + /***** READER SECTION START *****/
> down_read(&tomoyo_globally_readable_list_lock);
> list_for_each_cookie(pos, head->read_var2,
> &tomoyo_globally_readable_list) {
> @@ -254,6 +257,7 @@ bool tomoyo_read_globally_readable_polic
> }
> }
> up_read(&tomoyo_globally_readable_list_lock);
> + /***** READER SECTION END *****/
> return done;
> }
>
> @@ -284,7 +288,7 @@ static int tomoyo_update_file_pattern_en
> return -ENOMEM;
> if (!is_delete)
> new_entry = kmalloc(sizeof(*new_entry), GFP_KERNEL);
> - /***** EXCLUSIVE SECTION START *****/
> + /***** WRITER SECTION START *****/
> down_write(&tomoyo_pattern_list_lock);
> list_for_each_entry(ptr, &tomoyo_pattern_list, list) {
> if (saved_pattern != ptr->pattern)
> @@ -300,7 +304,7 @@ static int tomoyo_update_file_pattern_en
> error = 0;
> }
> up_write(&tomoyo_pattern_list_lock);
> - /***** EXCLUSIVE SECTION END *****/
> + /***** WRITER SECTION END *****/
> kfree(new_entry);
> return error;
> }
> @@ -318,6 +322,7 @@ tomoyo_get_file_pattern(const struct tom
> struct tomoyo_pattern_entry *ptr;
> const struct tomoyo_path_info *pattern = NULL;
>
> + /***** READER SECTION START *****/
> down_read(&tomoyo_pattern_list_lock);
> list_for_each_entry(ptr, &tomoyo_pattern_list, list) {
> if (ptr->is_deleted)
> @@ -333,6 +338,7 @@ tomoyo_get_file_pattern(const struct tom
> }
> }
> up_read(&tomoyo_pattern_list_lock);
> + /***** READER SECTION END *****/
> if (pattern)
> filename = pattern;
> return filename;
> @@ -363,6 +369,7 @@ bool tomoyo_read_file_pattern(struct tom
> struct list_head *pos;
> bool done = true;
>
> + /***** READER SECTION START *****/
> down_read(&tomoyo_pattern_list_lock);
> list_for_each_cookie(pos, head->read_var2, &tomoyo_pattern_list) {
> struct tomoyo_pattern_entry *ptr;
> @@ -376,6 +383,7 @@ bool tomoyo_read_file_pattern(struct tom
> }
> }
> up_read(&tomoyo_pattern_list_lock);
> + /***** READER SECTION END *****/
> return done;
> }
>
> @@ -406,7 +414,7 @@ static int tomoyo_update_no_rewrite_entr
> return -ENOMEM;
> if (!is_delete)
> new_entry = kmalloc(sizeof(*new_entry), GFP_KERNEL);
> - /***** EXCLUSIVE SECTION START *****/
> + /***** WRITER SECTION START *****/
> down_write(&tomoyo_no_rewrite_list_lock);
> list_for_each_entry(ptr, &tomoyo_no_rewrite_list, list) {
> if (ptr->pattern != saved_pattern)
> @@ -422,7 +430,7 @@ static int tomoyo_update_no_rewrite_entr
> error = 0;
> }
> up_write(&tomoyo_no_rewrite_list_lock);
> - /***** EXCLUSIVE SECTION END *****/
> + /***** WRITER SECTION END *****/
> kfree(new_entry);
> return error;
> }
> @@ -440,6 +448,7 @@ static bool tomoyo_is_no_rewrite_file(co
> struct tomoyo_no_rewrite_entry *ptr;
> bool found = false;
>
> + /***** READER SECTION START *****/
> down_read(&tomoyo_no_rewrite_list_lock);
> list_for_each_entry(ptr, &tomoyo_no_rewrite_list, list) {
> if (ptr->is_deleted)
> @@ -450,6 +459,7 @@ static bool tomoyo_is_no_rewrite_file(co
> break;
> }
> up_read(&tomoyo_no_rewrite_list_lock);
> + /***** READER SECTION END *****/
> return found;
> }
>
> @@ -478,6 +488,7 @@ bool tomoyo_read_no_rewrite_policy(struc
> struct list_head *pos;
> bool done = true;
>
> + /***** READER SECTION START *****/
> 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;
> @@ -491,6 +502,7 @@ bool tomoyo_read_no_rewrite_policy(struc
> }
> }
> up_read(&tomoyo_no_rewrite_list_lock);
> + /***** READER SECTION END *****/
> return done;
> }
>
> @@ -556,6 +568,7 @@ static int tomoyo_check_single_path_acl2
> struct tomoyo_acl_info *ptr;
> int error = -EPERM;
>
> + /***** READER SECTION START *****/
> down_read(&tomoyo_domain_acl_info_list_lock);
> list_for_each_entry(ptr, &domain->acl_info_list, list) {
> struct tomoyo_single_path_acl_record *acl;
> @@ -576,6 +589,7 @@ static int tomoyo_check_single_path_acl2
> break;
> }
> up_read(&tomoyo_domain_acl_info_list_lock);
> + /***** READER SECTION END *****/
> return error;
> }
>
> @@ -742,7 +756,7 @@ static int tomoyo_update_single_path_acl
> return -ENOMEM;
> if (!is_delete)
> new_entry = kmalloc(sizeof(*new_entry), GFP_KERNEL);
> - /***** EXCLUSIVE SECTION START *****/
> + /***** WRITER SECTION START *****/
> down_write(&tomoyo_domain_acl_info_list_lock);
> if (is_delete)
> goto delete;
> @@ -799,7 +813,7 @@ static int tomoyo_update_single_path_acl
> }
> out:
> up_write(&tomoyo_domain_acl_info_list_lock);
> - /***** EXCLUSIVE SECTION END *****/
> + /***** WRITER SECTION END *****/
> kfree(new_entry);
> return error;
> }
> @@ -838,7 +852,7 @@ static int tomoyo_update_double_path_acl
> return -ENOMEM;
> if (!is_delete)
> new_entry = kmalloc(sizeof(*new_entry), GFP_KERNEL);
> - /***** EXCLUSIVE SECTION START *****/
> + /***** WRITER SECTION START *****/
> down_write(&tomoyo_domain_acl_info_list_lock);
> if (is_delete)
> goto delete;
> @@ -888,7 +902,7 @@ static int tomoyo_update_double_path_acl
> }
> out:
> up_write(&tomoyo_domain_acl_info_list_lock);
> - /***** EXCLUSIVE SECTION END *****/
> + /***** WRITER SECTION END *****/
> kfree(new_entry);
> return error;
> }
> @@ -934,6 +948,7 @@ static int tomoyo_check_double_path_acl(
>
> if (!tomoyo_check_flags(domain, TOMOYO_MAC_FOR_FILE))
> return 0;
> + /***** READER SECTION START *****/
> down_read(&tomoyo_domain_acl_info_list_lock);
> list_for_each_entry(ptr, &domain->acl_info_list, list) {
> struct tomoyo_double_path_acl_record *acl;
> @@ -951,6 +966,7 @@ static int tomoyo_check_double_path_acl(
> break;
> }
> up_read(&tomoyo_domain_acl_info_list_lock);
> + /***** READER SECTION END *****/
> return error;
> }
>
> --- security-testing-2.6.git.orig/security/tomoyo/realpath.c
> +++ security-testing-2.6.git/security/tomoyo/realpath.c
> @@ -326,10 +326,12 @@ void __init tomoyo_realpath_init(void)
> 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);
> + /***** READER SECTION START *****/
> down_read(&tomoyo_domain_list_lock);
> if (tomoyo_find_domain(TOMOYO_ROOT_NAME) != &tomoyo_kernel_domain)
> panic("Can't register tomoyo_kernel_domain");
> up_read(&tomoyo_domain_list_lock);
> + /***** READER SECTION END *****/
> }
>
> /* Memory allocated for temporary purpose. */
--
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