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Message-ID: <20230208182123.3821604-1-edumazet@google.com>
Date: Wed, 8 Feb 2023 18:21:23 +0000
From: Eric Dumazet <edumazet@...gle.com>
To: "David S . Miller" <davem@...emloft.net>,
Jakub Kicinski <kuba@...nel.org>,
Paolo Abeni <pabeni@...hat.com>
Cc: netdev@...r.kernel.org, eric.dumazet@...il.com,
Eric Dumazet <edumazet@...gle.com>,
syzbot <syzkaller@...glegroups.com>
Subject: [PATCH net] net: initialize net->notrefcnt_tracker earlier
syzbot was able to trigger a warning [1] from net_free()
calling ref_tracker_dir_exit(&net->notrefcnt_tracker)
while the corresponding ref_tracker_dir_init() has not been
done yet.
copy_net_ns() can indeed bypass the call to setup_net()
in some error conditions.
Note:
We might factorize/move more code in preinit_net() in the future.
[1]
INFO: trying to register non-static key.
The code is fine but needs lockdep annotation, or maybe
you didn't initialize this object before use?
turning off the locking correctness validator.
CPU: 0 PID: 5817 Comm: syz-executor.3 Not tainted 6.2.0-rc7-next-20230208-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/12/2023
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0xd9/0x150 lib/dump_stack.c:106
assign_lock_key kernel/locking/lockdep.c:982 [inline]
register_lock_class+0xdb6/0x1120 kernel/locking/lockdep.c:1295
__lock_acquire+0x10a/0x5df0 kernel/locking/lockdep.c:4951
lock_acquire.part.0+0x11c/0x370 kernel/locking/lockdep.c:5691
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0x3d/0x60 kernel/locking/spinlock.c:162
ref_tracker_dir_exit+0x52/0x600 lib/ref_tracker.c:24
net_free net/core/net_namespace.c:442 [inline]
net_free+0x98/0xd0 net/core/net_namespace.c:436
copy_net_ns+0x4f3/0x6b0 net/core/net_namespace.c:493
create_new_namespaces+0x3f6/0xb20 kernel/nsproxy.c:110
unshare_nsproxy_namespaces+0xc1/0x1f0 kernel/nsproxy.c:228
ksys_unshare+0x449/0x920 kernel/fork.c:3205
__do_sys_unshare kernel/fork.c:3276 [inline]
__se_sys_unshare kernel/fork.c:3274 [inline]
__x64_sys_unshare+0x31/0x40 kernel/fork.c:3274
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
Fixes: 0cafd77dcd03 ("net: add a refcount tracker for kernel sockets")
Reported-by: syzbot <syzkaller@...glegroups.com>
Signed-off-by: Eric Dumazet <edumazet@...gle.com>
---
net/core/net_namespace.c | 10 +++++++++-
1 file changed, 9 insertions(+), 1 deletion(-)
diff --git a/net/core/net_namespace.c b/net/core/net_namespace.c
index 078a0a420c8a7a7c3b5c4f3c2e752c5db1519540..7b69cf882b8efd901be57217013ebb155b616787 100644
--- a/net/core/net_namespace.c
+++ b/net/core/net_namespace.c
@@ -304,6 +304,12 @@ struct net *get_net_ns_by_id(const struct net *net, int id)
}
EXPORT_SYMBOL_GPL(get_net_ns_by_id);
+/* init code that must occur even if setup_net() is not called. */
+static __net_init void preinit_net(struct net *net)
+{
+ ref_tracker_dir_init(&net->notrefcnt_tracker, 128);
+}
+
/*
* setup_net runs the initializers for the network namespace object.
*/
@@ -316,7 +322,6 @@ static __net_init int setup_net(struct net *net, struct user_namespace *user_ns)
refcount_set(&net->ns.count, 1);
ref_tracker_dir_init(&net->refcnt_tracker, 128);
- ref_tracker_dir_init(&net->notrefcnt_tracker, 128);
refcount_set(&net->passive, 1);
get_random_bytes(&net->hash_mix, sizeof(u32));
@@ -472,6 +477,8 @@ struct net *copy_net_ns(unsigned long flags,
rv = -ENOMEM;
goto dec_ucounts;
}
+
+ preinit_net(net);
refcount_set(&net->passive, 1);
net->ucounts = ucounts;
get_user_ns(user_ns);
@@ -1118,6 +1125,7 @@ void __init net_ns_init(void)
init_net.key_domain = &init_net_key_domain;
#endif
down_write(&pernet_ops_rwsem);
+ preinit_net(&init_net);
if (setup_net(&init_net, &init_user_ns))
panic("Could not setup the initial network namespace");
--
2.39.1.519.gcb327c4b5f-goog
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