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authorDavid Ahern <dsa@cumulusnetworks.com>2017-04-22 09:33:16 -0700
committerDavid S. Miller <davem@davemloft.net>2017-04-24 14:08:19 -0400
commit58c4c6a3f7cb3a142674ba34e7e67e2d585b9787 (patch)
tree66cdaaeec5e59c24914a91328f8dfa536376f255 /net
parentad0cb27ce99ccffcfd4e0b08ea2ee01f440e8eac (diff)
downloadlinux-58c4c6a3f7cb3a142674ba34e7e67e2d585b9787.tar.bz2
net: add rcu locking when changing early demux
systemd-sysctl is triggering a suspicious RCU usage message when net.ipv4.tcp_early_demux or net.ipv4.udp_early_demux is changed via a sysctl config file: [ 33.896184] =============================== [ 33.899558] [ ERR: suspicious RCU usage. ] [ 33.900624] 4.11.0-rc7+ #104 Not tainted [ 33.901698] ------------------------------- [ 33.903059] /home/dsa/kernel-2.git/net/ipv4/sysctl_net_ipv4.c:305 suspicious rcu_dereference_check() usage! [ 33.905724] other info that might help us debug this: [ 33.907656] rcu_scheduler_active = 2, debug_locks = 0 [ 33.909288] 1 lock held by systemd-sysctl/143: [ 33.910373] #0: (sb_writers#5){.+.+.+}, at: [<ffffffff8123a370>] file_start_write+0x45/0x48 [ 33.912407] stack backtrace: [ 33.914018] CPU: 0 PID: 143 Comm: systemd-sysctl Not tainted 4.11.0-rc7+ #104 [ 33.915631] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.7.5-20140531_083030-gandalf 04/01/2014 [ 33.917870] Call Trace: [ 33.918431] dump_stack+0x81/0xb6 [ 33.919241] lockdep_rcu_suspicious+0x10f/0x118 [ 33.920263] proc_configure_early_demux+0x65/0x10a [ 33.921391] proc_udp_early_demux+0x3a/0x41 add rcu locking to proc_configure_early_demux. Fixes: dddb64bcb3461 ("net: Add sysctl to toggle early demux for tcp and udp") Signed-off-by: David Ahern <dsa@cumulusnetworks.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
-rw-r--r--net/ipv4/sysctl_net_ipv4.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/net/ipv4/sysctl_net_ipv4.c b/net/ipv4/sysctl_net_ipv4.c
index 6fb25693c00b..ddac9e64b702 100644
--- a/net/ipv4/sysctl_net_ipv4.c
+++ b/net/ipv4/sysctl_net_ipv4.c
@@ -302,6 +302,8 @@ static void proc_configure_early_demux(int enabled, int protocol)
struct inet6_protocol *ip6prot;
#endif
+ rcu_read_lock();
+
ipprot = rcu_dereference(inet_protos[protocol]);
if (ipprot)
ipprot->early_demux = enabled ? ipprot->early_demux_handler :
@@ -313,6 +315,7 @@ static void proc_configure_early_demux(int enabled, int protocol)
ip6prot->early_demux = enabled ? ip6prot->early_demux_handler :
NULL;
#endif
+ rcu_read_unlock();
}
static int proc_tcp_early_demux(struct ctl_table *table, int write,