diff options
| author | Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> | 2010-05-05 17:18:15 +0200 |
|---|---|---|
| committer | James Morris <jmorris@namei.org> | 2010-05-06 05:19:18 +0200 |
| commit | 292823814261e085cdcef06b6b691e6c2563fbd4 (patch) | |
| tree | 8c1eaebcf8f698ea13ac2a9291b9769abde1905e /security/tomoyo/file.c | |
| parent | KEYS: Better handling of errors from construct_alloc_key() (diff) | |
| download | linux-292823814261e085cdcef06b6b691e6c2563fbd4.tar.xz linux-292823814261e085cdcef06b6b691e6c2563fbd4.zip | |
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.c | 18 |
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); |