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selinux: Check address length before reading address family

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KMSAN will complain if valid address length passed to bind()/connect() is
shorter than sizeof("struct sockaddr"->sa_family) bytes.

Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Signed-off-by: Paul Moore <paul@paul-moore.com>
This commit is contained in:
Tetsuo Handa 2019-04-12 19:59:34 +09:00 committed by Paul Moore
parent 1537ad15c9
commit c750e6929d
1 changed files with 6 additions and 1 deletions
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7
security/selinux/hooks.c
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@ -4512,7 +4512,7 @@ static int selinux_socket_bind(struct socket *sock, struct sockaddr *address, in
struct lsm_network_audit net = {0,};
struct sockaddr_in *addr4 = NULL;
struct sockaddr_in6 *addr6 = NULL;
u16 family_sa = address->sa_family;
u16 family_sa;
unsigned short snum;
u32 sid, node_perm;
@ -4522,6 +4522,9 @@ static int selinux_socket_bind(struct socket *sock, struct sockaddr *address, in
* need to check address->sa_family as it is possible to have
* sk->sk_family = PF_INET6 with addr->sa_family = AF_INET.
*/
if (addrlen < offsetofend(struct sockaddr, sa_family))
return -EINVAL;
family_sa = address->sa_family;
switch (family_sa) {
case AF_UNSPEC:
case AF_INET:
@ -4654,6 +4657,8 @@ static int selinux_socket_connect_helper(struct socket *sock,
* need to check address->sa_family as it is possible to have
* sk->sk_family = PF_INET6 with addr->sa_family = AF_INET.
*/
if (addrlen < offsetofend(struct sockaddr, sa_family))
return -EINVAL;
switch (address->sa_family) {
case AF_INET:
addr4 = (struct sockaddr_in *)address;