diff options
| author | Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> | 2019-04-12 19:59:35 +0900 |
|---|---|---|
| committer | Casey Schaufler <casey@schaufler-ca.com> | 2019-04-29 17:32:27 -0700 |
| commit | b9ef5513c99bf9c8bfd9c9e8051b67f52b2dee1e (patch) | |
| tree | d168ccc0225f3ab3fd890a893a5813dfd4f27065 | |
| parent | f7450bc6e76860564f3842a41892f9b74313cc23 (diff) | |
smack: Check address length before reading address family
KMSAN will complain if valid address length passed to bind()/connect()/
sendmsg() is shorter than sizeof("struct sockaddr"->sa_family) bytes.
Also, since smk_ipv6_port_label()/smack_netlabel_send()/
smack_ipv6host_label()/smk_ipv6_check()/smk_ipv6_port_check() are not
checking valid address length and/or address family, make sure we check
both. The minimal valid length in smack_socket_connect() is changed from
sizeof(struct sockaddr_in6) bytes to SIN6_LEN_RFC2133 bytes, for it seems
that Smack is not using "struct sockaddr_in6"->sin6_scope_id field.
Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Signed-off-by: Casey Schaufler <casey@schaufler-ca.com>
| -rw-r--r-- | security/smack/smack_lsm.c | 19 |
1 files changed, 15 insertions, 4 deletions
diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c index b9abcdb36a73..b5b333d72637 100644 --- a/security/smack/smack_lsm.c +++ b/security/smack/smack_lsm.c @@ -2806,13 +2806,17 @@ static int smack_socket_socketpair(struct socket *socka, * * Records the label bound to a port. * - * Returns 0 + * Returns 0 on success, and error code otherwise */ static int smack_socket_bind(struct socket *sock, struct sockaddr *address, int addrlen) { - if (sock->sk != NULL && sock->sk->sk_family == PF_INET6) + if (sock->sk != NULL && sock->sk->sk_family == PF_INET6) { + if (addrlen < SIN6_LEN_RFC2133 || + address->sa_family != AF_INET6) + return -EINVAL; smk_ipv6_port_label(sock, address); + } return 0; } #endif /* SMACK_IPV6_PORT_LABELING */ @@ -2848,12 +2852,13 @@ static int smack_socket_connect(struct socket *sock, struct sockaddr *sap, switch (sock->sk->sk_family) { case PF_INET: - if (addrlen < sizeof(struct sockaddr_in)) + if (addrlen < sizeof(struct sockaddr_in) || + sap->sa_family != AF_INET) return -EINVAL; rc = smack_netlabel_send(sock->sk, (struct sockaddr_in *)sap); break; case PF_INET6: - if (addrlen < sizeof(struct sockaddr_in6)) + if (addrlen < SIN6_LEN_RFC2133 || sap->sa_family != AF_INET6) return -EINVAL; #ifdef SMACK_IPV6_SECMARK_LABELING rsp = smack_ipv6host_label(sip); @@ -3683,9 +3688,15 @@ static int smack_socket_sendmsg(struct socket *sock, struct msghdr *msg, switch (sock->sk->sk_family) { case AF_INET: + if (msg->msg_namelen < sizeof(struct sockaddr_in) || + sip->sin_family != AF_INET) + return -EINVAL; rc = smack_netlabel_send(sock->sk, sip); break; case AF_INET6: + if (msg->msg_namelen < SIN6_LEN_RFC2133 || + sap->sin6_family != AF_INET6) + return -EINVAL; #ifdef SMACK_IPV6_SECMARK_LABELING rsp = smack_ipv6host_label(sap); if (rsp != NULL) |