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selinux/stable-4.17 PR 20180516

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Merge tag 'selinux-pr-20180516' of git://git.kernel.org/pub/scm/linux/kernel/git/pcmoore/selinux

Pull SELinux fixes from Paul Moore:
 "A small pull request to fix a few regressions in the SELinux/SCTP code
  with applications that call bind() with AF_UNSPEC/INADDR_ANY.

  The individual commit descriptions have more information, but the
  commits themselves should be self explanatory"

* tag 'selinux-pr-20180516' of git://git.kernel.org/pub/scm/linux/kernel/git/pcmoore/selinux:
  selinux: correctly handle sa_family cases in selinux_sctp_bind_connect()
  selinux: fix address family in bind() and connect() to match address/port
  selinux: add AF_UNSPEC and INADDR_ANY checks to selinux_socket_bind()
This commit is contained in:
Linus Torvalds 2018-05-17 10:02:19 -07:00
commit 305bb55212
1 changed files with 28 additions and 22 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

50
security/selinux/hooks.c
View File

@ -4576,6 +4576,7 @@ static int selinux_socket_post_create(struct socket *sock, int family,
static int selinux_socket_bind(struct socket *sock, struct sockaddr *address, int addrlen)
{
struct sock *sk = sock->sk;
struct sk_security_struct *sksec = sk->sk_security;
u16 family;
int err;
@ -4587,11 +4588,11 @@ static int selinux_socket_bind(struct socket *sock, struct sockaddr *address, in
family = sk->sk_family;
if (family == PF_INET || family == PF_INET6) {
char *addrp;
struct sk_security_struct *sksec = sk->sk_security;
struct common_audit_data ad;
struct lsm_network_audit net = {0,};
struct sockaddr_in *addr4 = NULL;
struct sockaddr_in6 *addr6 = NULL;
u16 family_sa = address->sa_family;
unsigned short snum;
u32 sid, node_perm;
@ -4601,11 +4602,20 @@ 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.
*/
switch (address->sa_family) {
switch (family_sa) {
case AF_UNSPEC:
case AF_INET:
if (addrlen < sizeof(struct sockaddr_in))
return -EINVAL;
addr4 = (struct sockaddr_in *)address;
if (family_sa == AF_UNSPEC) {
/* see __inet_bind(), we only want to allow
* AF_UNSPEC if the address is INADDR_ANY
*/
if (addr4->sin_addr.s_addr != htonl(INADDR_ANY))
goto err_af;
family_sa = AF_INET;
}
snum = ntohs(addr4->sin_port);
addrp = (char *)&addr4->sin_addr.s_addr;
break;
@ -4617,15 +4627,14 @@ static int selinux_socket_bind(struct socket *sock, struct sockaddr *address, in
addrp = (char *)&addr6->sin6_addr.s6_addr;
break;
default:
/* Note that SCTP services expect -EINVAL, whereas
* others expect -EAFNOSUPPORT.
*/
if (sksec->sclass == SECCLASS_SCTP_SOCKET)
return -EINVAL;
else
return -EAFNOSUPPORT;
goto err_af;
}
ad.type = LSM_AUDIT_DATA_NET;
ad.u.net = &net;
ad.u.net->sport = htons(snum);
ad.u.net->family = family_sa;
if (snum) {
int low, high;
@ -4637,10 +4646,6 @@ static int selinux_socket_bind(struct socket *sock, struct sockaddr *address, in
snum, &sid);
if (err)
goto out;
ad.type = LSM_AUDIT_DATA_NET;
ad.u.net = &net;
ad.u.net->sport = htons(snum);
ad.u.net->family = family;
err = avc_has_perm(&selinux_state,
sksec->sid, sid,
sksec->sclass,
@ -4672,16 +4677,11 @@ static int selinux_socket_bind(struct socket *sock, struct sockaddr *address, in
break;
}
err = sel_netnode_sid(addrp, family, &sid);
err = sel_netnode_sid(addrp, family_sa, &sid);
if (err)
goto out;
ad.type = LSM_AUDIT_DATA_NET;
ad.u.net = &net;
ad.u.net->sport = htons(snum);
ad.u.net->family = family;
if (address->sa_family == AF_INET)
if (family_sa == AF_INET)
ad.u.net->v4info.saddr = addr4->sin_addr.s_addr;
else
ad.u.net->v6info.saddr = addr6->sin6_addr;
@ -4694,6 +4694,11 @@ static int selinux_socket_bind(struct socket *sock, struct sockaddr *address, in
}
out:
return err;
err_af:
/* Note that SCTP services expect -EINVAL, others -EAFNOSUPPORT. */
if (sksec->sclass == SECCLASS_SCTP_SOCKET)
return -EINVAL;
return -EAFNOSUPPORT;
}
/* This supports connect(2) and SCTP connect services such as sctp_connectx(3)
@ -4771,7 +4776,7 @@ static int selinux_socket_connect_helper(struct socket *sock,
ad.type = LSM_AUDIT_DATA_NET;
ad.u.net = &net;
ad.u.net->dport = htons(snum);
ad.u.net->family = sk->sk_family;
ad.u.net->family = address->sa_family;
err = avc_has_perm(&selinux_state,
sksec->sid, sid, sksec->sclass, perm, &ad);
if (err)
@ -5272,6 +5277,7 @@ static int selinux_sctp_bind_connect(struct sock *sk, int optname,
while (walk_size < addrlen) {
addr = addr_buf;
switch (addr->sa_family) {
case AF_UNSPEC:
case AF_INET:
len = sizeof(struct sockaddr_in);
break;
@ -5279,7 +5285,7 @@ static int selinux_sctp_bind_connect(struct sock *sk, int optname,
len = sizeof(struct sockaddr_in6);
break;
default:
return -EAFNOSUPPORT;
return -EINVAL;
}
err = -EINVAL;