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authorTetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>2010-05-06 00:18:15 +0900
committerJames Morris <jmorris@namei.org>2010-05-06 13:19:18 +1000
commit292823814261e085cdcef06b6b691e6c2563fbd4 (patch)
tree8c1eaebcf8f698ea13ac2a9291b9769abde1905e /security/tomoyo/file.c
parent2b9e4688fad8867b6e918610f396af3ab9246898 (diff)
downloadlinux-next-292823814261e085cdcef06b6b691e6c2563fbd4.tar.gz
TOMOYO: Use mutex_lock_interruptible.
Some of TOMOYO's functions may sleep after mutex_lock(). If OOM-killer selected a process which is waiting at mutex_lock(), the to-be-killed process can't be killed. Thus, replace mutex_lock() with mutex_lock_interruptible() so that the to-be-killed process can immediately return from TOMOYO's functions. Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> Signed-off-by: James Morris <jmorris@namei.org>
Diffstat (limited to 'security/tomoyo/file.c')
-rw-r--r--security/tomoyo/file.c18
1 files changed, 13 insertions, 5 deletions
diff --git a/security/tomoyo/file.c b/security/tomoyo/file.c
index 0687ada28e82..060bbf3870ce 100644
--- a/security/tomoyo/file.c
+++ b/security/tomoyo/file.c
@@ -176,7 +176,8 @@ static int tomoyo_update_globally_readable_entry(const char *filename,
return -ENOMEM;
if (!is_delete)
entry = kmalloc(sizeof(*entry), GFP_NOFS);
- mutex_lock(&tomoyo_policy_lock);
+ 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)
continue;
@@ -192,6 +193,7 @@ static int tomoyo_update_globally_readable_entry(const char *filename,
error = 0;
}
mutex_unlock(&tomoyo_policy_lock);
+ out:
tomoyo_put_name(saved_filename);
kfree(entry);
return error;
@@ -323,7 +325,8 @@ static int tomoyo_update_file_pattern_entry(const char *pattern,
goto out;
if (!is_delete)
entry = kmalloc(sizeof(*entry), GFP_NOFS);
- mutex_lock(&tomoyo_policy_lock);
+ if (mutex_lock_interruptible(&tomoyo_policy_lock))
+ goto out;
list_for_each_entry_rcu(ptr, &tomoyo_pattern_list, list) {
if (saved_pattern != ptr->pattern)
continue;
@@ -476,7 +479,8 @@ static int tomoyo_update_no_rewrite_entry(const char *pattern,
return error;
if (!is_delete)
entry = kmalloc(sizeof(*entry), GFP_NOFS);
- mutex_lock(&tomoyo_policy_lock);
+ 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)
continue;
@@ -492,6 +496,7 @@ static int tomoyo_update_no_rewrite_entry(const char *pattern,
error = 0;
}
mutex_unlock(&tomoyo_policy_lock);
+ out:
tomoyo_put_name(saved_pattern);
kfree(entry);
return error;
@@ -822,7 +827,8 @@ static int tomoyo_update_path_acl(const u8 type, const char *filename,
return -ENOMEM;
if (!is_delete)
entry = kmalloc(sizeof(*entry), GFP_NOFS);
- mutex_lock(&tomoyo_policy_lock);
+ if (mutex_lock_interruptible(&tomoyo_policy_lock))
+ goto out;
list_for_each_entry_rcu(ptr, &domain->acl_info_list, list) {
struct tomoyo_path_acl *acl =
container_of(ptr, struct tomoyo_path_acl, head);
@@ -867,6 +873,7 @@ static int tomoyo_update_path_acl(const u8 type, const char *filename,
error = 0;
}
mutex_unlock(&tomoyo_policy_lock);
+ out:
kfree(entry);
tomoyo_put_name(saved_filename);
return error;
@@ -908,7 +915,8 @@ static int tomoyo_update_path2_acl(const u8 type, const char *filename1,
goto out;
if (!is_delete)
entry = kmalloc(sizeof(*entry), GFP_NOFS);
- mutex_lock(&tomoyo_policy_lock);
+ if (mutex_lock_interruptible(&tomoyo_policy_lock))
+ goto out;
list_for_each_entry_rcu(ptr, &domain->acl_info_list, list) {
struct tomoyo_path2_acl *acl =
container_of(ptr, struct tomoyo_path2_acl, head);