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Commit 4221a991 authored by Tetsuo Handa's avatar Tetsuo Handa Committed by Paul E. McKenney
Browse files

Add RCU check for find_task_by_vpid(). 



find_task_by_vpid() says "Must be called under rcu_read_lock().". But due to
commit 3120438a "rcu: Disable lockdep checking in RCU list-traversal primitives",
we are currently unable to catch "find_task_by_vpid() with tasklist_lock held
but RCU lock not held" errors due to the RCU-lockdep checks being
suppressed in the RCU variants of the struct list_head traversals.
This commit therefore places an explicit check for being in an RCU
read-side critical section in find_task_by_pid_ns().

  ===================================================
  [ INFO: suspicious rcu_dereference_check() usage. ]
  ---------------------------------------------------
  kernel/pid.c:386 invoked rcu_dereference_check() without protection!

  other info that might help us debug this:

  rcu_scheduler_active = 1, debug_locks = 1
  1 lock held by rc.sysinit/1102:
   #0:  (tasklist_lock){.+.+..}, at: [<c1048340>] sys_setpgid+0x40/0x160

  stack backtrace:
  Pid: 1102, comm: rc.sysinit Not tainted 2.6.35-rc3-dirty #1
  Call Trace:
   [<c105e714>] lockdep_rcu_dereference+0x94/0xb0
   [<c104b4cd>] find_task_by_pid_ns+0x6d/0x70
   [<c104b4e8>] find_task_by_vpid+0x18/0x20
   [<c1048347>] sys_setpgid+0x47/0x160
   [<c1002b50>] sysenter_do_call+0x12/0x36

Commit updated to use a new rcu_lockdep_assert() exported API rather than
the old internal __do_rcu_dereference().

Signed-off-by: default avatarTetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Signed-off-by: default avatarPaul E. McKenney <paulmck@linux.vnet.ibm.com>
Reviewed-by: default avatarJosh Triplett <josh@joshtriplett.org>
parent 394f99a9

include/linux/rcupdate.h

+9 −5
Original line number Diff line number Diff line
@@ -215,7 +215,11 @@ static inline int rcu_read_lock_sched_held(void) 


extern int rcu_my_thread_group_empty(void);



#define __do_rcu_dereference_check(c)					\

/**

 * rcu_lockdep_assert - emit lockdep splat if specified condition not met

 * @c: condition to check

 */

#define rcu_lockdep_assert(c)						\

	do {								\

		static bool __warned;					\

		if (debug_lockdep_rcu_enabled() && !__warned && !(c)) {	\
@@ -226,7 +230,7 @@ extern int rcu_my_thread_group_empty(void); 


#else /* #ifdef CONFIG_PROVE_RCU */



#define __do_rcu_dereference_check(c) do { } while (0)

#define rcu_lockdep_assert(c) do { } while (0)



#endif /* #else #ifdef CONFIG_PROVE_RCU */
@@ -247,14 +251,14 @@ extern int rcu_my_thread_group_empty(void); 
#define __rcu_dereference_check(p, c, space) \

	({ \

		typeof(*p) *_________p1 = (typeof(*p)*__force )ACCESS_ONCE(p); \

		__do_rcu_dereference_check(c); \

		rcu_lockdep_assert(c); \

		(void) (((typeof (*p) space *)p) == p); \

		smp_read_barrier_depends(); \

		((typeof(*p) __force __kernel *)(_________p1)); \

	})

#define __rcu_dereference_protected(p, c, space) \

	({ \

		__do_rcu_dereference_check(c); \

		rcu_lockdep_assert(c); \

		(void) (((typeof (*p) space *)p) == p); \

		((typeof(*p) __force __kernel *)(p)); \

	})
@@ -262,7 +266,7 @@ extern int rcu_my_thread_group_empty(void); 
#define __rcu_dereference_index_check(p, c) \

	({ \

		typeof(p) _________p1 = ACCESS_ONCE(p); \

		__do_rcu_dereference_check(c); \

		rcu_lockdep_assert(c); \

		smp_read_barrier_depends(); \

		(_________p1); \

	})

kernel/pid.c

+1 −0
Original line number Diff line number Diff line
@@ -416,6 +416,7 @@ EXPORT_SYMBOL(pid_task); 
 */

struct task_struct *find_task_by_pid_ns(pid_t nr, struct pid_namespace *ns)

{

	rcu_lockdep_assert(rcu_read_lock_held());

	return pid_task(find_pid_ns(nr, ns), PIDTYPE_PID);

}