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authorTetsuo Handa <penguin-kernel@i-love.sakura.ne.jp>2010-02-25 17:19:25 +0900
committerJames Morris <jmorris@namei.org>2010-02-26 09:20:11 +1100
commit1fcdc7c527010b144d3951f9ce25faedf264933c (patch)
tree5ab23281aae1de41079f2b4962fe17ab6d59be6d /security/tomoyo/common.c
parent189b3b1c89761054fee3438f063d7f257306e2d8 (diff)
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TOMOYO: Protect find_task_by_vpid() with RCU.
Holding tasklist_lock is no longer sufficient for find_task_by_vpid(). Explicit rcu_read_lock() is required. Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> -- security/tomoyo/common.c | 4 ++++ 1 file changed, 4 insertions(+) Signed-off-by: James Morris <jmorris@namei.org>
Diffstat (limited to 'security/tomoyo/common.c')
-rw-r--r--security/tomoyo/common.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/security/tomoyo/common.c b/security/tomoyo/common.c
index 30dd1c68a64..ff51f1026b5 100644
--- a/security/tomoyo/common.c
+++ b/security/tomoyo/common.c
@@ -1232,11 +1232,13 @@ static bool tomoyo_is_select_one(struct tomoyo_io_buffer *head,
if (sscanf(data, "pid=%u", &pid) == 1) {
struct task_struct *p;
+ rcu_read_lock();
read_lock(&tasklist_lock);
p = find_task_by_vpid(pid);
if (p)
domain = tomoyo_real_domain(p);
read_unlock(&tasklist_lock);
+ rcu_read_unlock();
} else if (!strncmp(data, "domain=", 7)) {
if (tomoyo_is_domain_def(data + 7))
domain = tomoyo_find_domain(data + 7);
@@ -1635,11 +1637,13 @@ static int tomoyo_read_pid(struct tomoyo_io_buffer *head)
const int pid = head->read_step;
struct task_struct *p;
struct tomoyo_domain_info *domain = NULL;
+ rcu_read_lock();
read_lock(&tasklist_lock);
p = find_task_by_vpid(pid);
if (p)
domain = tomoyo_real_domain(p);
read_unlock(&tasklist_lock);
+ rcu_read_unlock();
if (domain)
tomoyo_io_printf(head, "%d %u %s", pid, domain->profile,
domain->domainname->name);