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-rw-r--r--security/selinux/hooks.c90
-rw-r--r--security/selinux/ss/services.c2
2 files changed, 61 insertions, 31 deletions
diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index 4cafe6a19167..7df0f2ee1e88 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -274,11 +274,10 @@ static int inode_doinit_with_dentry(struct inode *inode, struct dentry *opt_dent
* Try reloading inode security labels that have been marked as invalid. The
* @may_sleep parameter indicates when sleeping and thus reloading labels is
* allowed; when set to false, returns -ECHILD when the label is
- * invalid. The @opt_dentry parameter should be set to a dentry of the inode;
- * when no dentry is available, set it to NULL instead.
+ * invalid. The @dentry parameter should be set to a dentry of the inode.
*/
static int __inode_security_revalidate(struct inode *inode,
- struct dentry *opt_dentry,
+ struct dentry *dentry,
bool may_sleep)
{
struct inode_security_struct *isec = inode->i_security;
@@ -295,7 +294,7 @@ static int __inode_security_revalidate(struct inode *inode,
* @opt_dentry is NULL and no dentry for this inode can be
* found; in that case, continue using the old label.
*/
- inode_doinit_with_dentry(inode, opt_dentry);
+ inode_doinit_with_dentry(inode, dentry);
}
return 0;
}
@@ -1568,8 +1567,15 @@ static int inode_doinit_with_dentry(struct inode *inode, struct dentry *opt_dent
/* Called from d_instantiate or d_splice_alias. */
dentry = dget(opt_dentry);
} else {
- /* Called from selinux_complete_init, try to find a dentry. */
+ /*
+ * Called from selinux_complete_init, try to find a dentry.
+ * Some filesystems really want a connected one, so try
+ * that first. We could split SECURITY_FS_USE_XATTR in
+ * two, depending upon that...
+ */
dentry = d_find_alias(inode);
+ if (!dentry)
+ dentry = d_find_any_alias(inode);
}
if (!dentry) {
/*
@@ -1674,14 +1680,19 @@ static int inode_doinit_with_dentry(struct inode *inode, struct dentry *opt_dent
if ((sbsec->flags & SE_SBGENFS) && !S_ISLNK(inode->i_mode)) {
/* We must have a dentry to determine the label on
* procfs inodes */
- if (opt_dentry)
+ if (opt_dentry) {
/* Called from d_instantiate or
* d_splice_alias. */
dentry = dget(opt_dentry);
- else
+ } else {
/* Called from selinux_complete_init, try to
- * find a dentry. */
+ * find a dentry. Some filesystems really want
+ * a connected one, so try that first.
+ */
dentry = d_find_alias(inode);
+ if (!dentry)
+ dentry = d_find_any_alias(inode);
+ }
/*
* This can be hit on boot when a file is accessed
* before the policy is loaded. When we load policy we
@@ -4569,6 +4580,18 @@ static int selinux_socket_post_create(struct socket *sock, int family,
return err;
}
+static int selinux_socket_socketpair(struct socket *socka,
+ struct socket *sockb)
+{
+ struct sk_security_struct *sksec_a = socka->sk->sk_security;
+ struct sk_security_struct *sksec_b = sockb->sk->sk_security;
+
+ sksec_a->peer_sid = sksec_b->sid;
+ sksec_b->peer_sid = sksec_a->sid;
+
+ return 0;
+}
+
/* Range of port numbers used to automatically bind.
Need to determine whether we should perform a name_bind
permission check between the socket and the port number. */
@@ -4576,6 +4599,7 @@ 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 +4611,11 @@ 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 +4625,20 @@ 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 +4650,14 @@ 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 +4669,6 @@ 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 +4700,11 @@ 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 +4717,11 @@ 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 +4799,7 @@ 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 +5300,7 @@ 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 +5308,7 @@ static int selinux_sctp_bind_connect(struct sock *sk, int optname,
len = sizeof(struct sockaddr_in6);
break;
default:
- return -EAFNOSUPPORT;
+ return -EINVAL;
}
err = -EINVAL;
@@ -6999,6 +7028,7 @@ static struct security_hook_list selinux_hooks[] __lsm_ro_after_init = {
LSM_HOOK_INIT(socket_create, selinux_socket_create),
LSM_HOOK_INIT(socket_post_create, selinux_socket_post_create),
+ LSM_HOOK_INIT(socket_socketpair, selinux_socket_socketpair),
LSM_HOOK_INIT(socket_bind, selinux_socket_bind),
LSM_HOOK_INIT(socket_connect, selinux_socket_connect),
LSM_HOOK_INIT(socket_listen, selinux_socket_listen),
diff --git a/security/selinux/ss/services.c b/security/selinux/ss/services.c
index 8057e19dc15f..3ce225e3f142 100644
--- a/security/selinux/ss/services.c
+++ b/security/selinux/ss/services.c
@@ -1494,7 +1494,7 @@ static int security_context_to_sid_core(struct selinux_state *state,
scontext_len, &context, def_sid);
if (rc == -EINVAL && force) {
context.str = str;
- context.len = scontext_len;
+ context.len = strlen(str) + 1;
str = NULL;
} else if (rc)
goto out_unlock;
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.