[PATCH 5.15 119/201] ip: Fix data-races around sysctl_ip_prot_sock.

Greg Kroah-Hartman
2022-07-27T17:15:03Z

From: Kuniyuki Iwashima <kuniyu@amazon.com>

[ Upstream commit 9b55c20f83369dd54541d9ddbe3a018a8377f451 ]

sysctl_ip_prot_sock is accessed concurrently, and there is always a chance
of data-race. So, all readers and writers need some basic protection to
avoid load/store-tearing.

Fixes: 4548b683b781 ("Introduce a sysctl that modifies the value of PROT_SOCK.")
Signed-off-by: Kuniyuki Iwashima <kuniyu@amazon.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
include/net/ip.h | 2 +-
net/ipv4/sysctl_net_ipv4.c | 6 +++---
2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/include/net/ip.h b/include/net/ip.h
index a0ac57af82dc..8462ced0c21e 100644
--- a/include/net/ip.h
+++ b/include/net/ip.h
@@ -352,7 +352,7 @@ static inline bool sysctl_dev_name_is_allowed(const char *name)

static inline bool inet_port_requires_bind_service(struct net *net, unsigned short port)
{
- return port < net->ipv4.sysctl_ip_prot_sock;
+ return port < READ_ONCE(net->ipv4.sysctl_ip_prot_sock);
}

#else
diff --git a/net/ipv4/sysctl_net_ipv4.c b/net/ipv4/sysctl_net_ipv4.c
index ead5db7e24ea..a36728277e32 100644
--- a/net/ipv4/sysctl_net_ipv4.c
+++ b/net/ipv4/sysctl_net_ipv4.c
@@ -97,7 +97,7 @@ static int ipv4_local_port_range(struct ctl_table *table, int write,
* port limit.
*/
if ((range[1] < range[0]) ||
- (range[0] < net->ipv4.sysctl_ip_prot_sock))
+ (range[0] < READ_ONCE(net->ipv4.sysctl_ip_prot_sock)))
ret = -EINVAL;
else
set_local_port_range(net, range);
@@ -123,7 +123,7 @@ static int ipv4_privileged_ports(struct ctl_table *table, int write,
.extra2 = &ip_privileged_port_max,
};

- pports = net->ipv4.sysctl_ip_prot_sock;
+ pports = READ_ONCE(net->ipv4.sysctl_ip_prot_sock);

ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);

@@ -135,7 +135,7 @@ static int ipv4_privileged_ports(struct ctl_table *table, int write,
if (range[0] < pports)
ret = -EINVAL;
else
- net->ipv4.sysctl_ip_prot_sock = pports;
+ WRITE_ONCE(net->ipv4.sysctl_ip_prot_sock, pports);
}

return ret;
--
2.35.1