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>

security/tomoyo/common.c

diff --git a/security/tomoyo/common.c b/security/tomoyo/common.c
index 30dd1c6..ff51f10 100644
--- a/security/tomoyo/common.c
+++ b/security/tomoyo/common.c
@@ -1232,11 +1232,13 @@
 
 	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 @@
 		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);