From: Dave Jones <[email protected]>
Subject: selinux: fix sel_netnode_insert() suspicious rcu dereference
===============================
[ INFO: suspicious RCU usage. ]
3.5.0-rc1+ #63 Not tainted
-------------------------------
security/selinux/netnode.c:178 suspicious rcu_dereference_check() usage!
other info that might help us debug this:
rcu_scheduler_active = 1, debug_locks = 0
1 lock held by trinity-child1/8750:
#0: (sel_netnode_lock){+.....}, at: [<ffffffff812d8f8a>]
sel_netnode_sid+0x16a/0x3e0
stack backtrace:
Pid: 8750, comm: trinity-child1 Not tainted 3.5.0-rc1+ #63
Call Trace:
[<ffffffff810cec2d>] lockdep_rcu_suspicious+0xfd/0x130
[<ffffffff812d91d1>] sel_netnode_sid+0x3b1/0x3e0
[<ffffffff812d8e20>] ? sel_netnode_find+0x1a0/0x1a0
[<ffffffff812d24a6>] selinux_socket_bind+0xf6/0x2c0
[<ffffffff810cd1dd>] ? trace_hardirqs_off+0xd/0x10
[<ffffffff810cdb55>] ? lock_release_holdtime.part.9+0x15/0x1a0
[<ffffffff81093841>] ? lock_hrtimer_base+0x31/0x60
[<ffffffff812c9536>] security_socket_bind+0x16/0x20
[<ffffffff815550ca>] sys_bind+0x7a/0x100
[<ffffffff816c03d5>] ? sysret_check+0x22/0x5d
[<ffffffff810d392d>] ? trace_hardirqs_on_caller+0x10d/0x1a0
[<ffffffff8133b09e>] ? trace_hardirqs_on_thunk+0x3a/0x3f
[<ffffffff816c03a9>] system_call_fastpath+0x16/0x1b
This patch below does what Paul McKenney suggested in the previous thread.
Signed-off-by: Dave Jones <[email protected]>
Reviewed-by: Paul E. McKenney <[email protected]>
Acked-by: Paul Moore <[email protected]>
Cc: Eric Paris <[email protected]>
Cc: James Morris <[email protected]>
Cc: <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
---
security/selinux/netnode.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff -puN
security/selinux/netnode.c~selinux-fix-sel_netnode_insert-suspicious-rcu-dereference
security/selinux/netnode.c
---
a/security/selinux/netnode.c~selinux-fix-sel_netnode_insert-suspicious-rcu-dereference
+++ a/security/selinux/netnode.c
@@ -174,7 +174,8 @@ static void sel_netnode_insert(struct se
if (sel_netnode_hash[idx].size == SEL_NETNODE_HASH_BKT_LIMIT) {
struct sel_netnode *tail;
tail = list_entry(
- rcu_dereference(sel_netnode_hash[idx].list.prev),
+
rcu_dereference_protected(sel_netnode_hash[idx].list.prev,
+
lockdep_is_held(&sel_netnode_lock)),
struct sel_netnode, list);
list_del_rcu(&tail->list);
kfree_rcu(tail, rcu);
_
--
To unsubscribe from this list: send the line "unsubscribe stable" in
the body of a message to [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
