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ip: Fix data-races around sysctl_ip_prot_sock. 

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: 4548b683b7 ("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>
This commit is contained in:
Kuniyuki Iwashima 2022-07-18 10:26:42 -07:00 committed by David S. Miller
parent 8895a9c2ac
commit 9b55c20f83
2 changed files with 4 additions and 4 deletions
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2
include/net/ip.h
View File

@ -357,7 +357,7 @@ 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

6
net/ipv4/sysctl_net_ipv4.c
View File

@ -84,7 +84,7 @@ 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);
@ -110,7 +110,7 @@ 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);
@ -122,7 +122,7 @@ 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;