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Merge branch 'next-smack' of git://git.kernel.org/pub/scm/linux/kerne…
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…l/git/jmorris/linux-security

Pull smack updates from James Morris:
 "Bug fixes for IPv6 handling and other issues and two memory use
  improvements."

* 'next-smack' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security:
  Smack: Fix kbuild reported build error
  smack: Check address length before reading address family
  Smack: Fix IPv6 handling of 0 secmark
  Smack: Create smack_rule cache to optimize memory usage
  smack: removal of global rule list
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@torvalds
torvalds committed May 9, 2019
2 parents 7664cd6 + 8d31a5c commit 800c608
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Showing 3 changed files with 45 additions and 45 deletions.
1 change: 1 addition & 0 deletions security/smack/smack.h
View file
Original file line number Diff line number Diff line change
Expand Up @@ -348,6 +348,7 @@ extern struct list_head smack_onlycap_list;

#define SMACK_HASH_SLOTS 16
extern struct hlist_head smack_known_hash[SMACK_HASH_SLOTS];
extern struct kmem_cache *smack_rule_cache;

static inline struct task_smack *smack_cred(const struct cred *cred)
{
Expand Down
34 changes: 28 additions & 6 deletions security/smack/smack_lsm.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -59,6 +59,7 @@ DEFINE_MUTEX(smack_ipv6_lock);
static LIST_HEAD(smk_ipv6_port_list);
#endif
static struct kmem_cache *smack_inode_cache;
struct kmem_cache *smack_rule_cache;
int smack_enabled;

#define A(s) {"smack"#s, sizeof("smack"#s) - 1, Opt_##s}
Expand Down Expand Up @@ -354,7 +355,7 @@ static int smk_copy_rules(struct list_head *nhead, struct list_head *ohead,
int rc = 0;

list_for_each_entry_rcu(orp, ohead, list) {
nrp = kzalloc(sizeof(struct smack_rule), gfp);
nrp = kmem_cache_zalloc(smack_rule_cache, gfp);
if (nrp == NULL) {
rc = -ENOMEM;
break;
Expand Down Expand Up @@ -1931,7 +1932,7 @@ static void smack_cred_free(struct cred *cred)
list_for_each_safe(l, n, &tsp->smk_rules) {
rp = list_entry(l, struct smack_rule, list);
list_del(&rp->list);
kfree(rp);
kmem_cache_free(smack_rule_cache, rp);
}
}

Expand Down Expand Up @@ -2805,13 +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 */
Expand Down Expand Up @@ -2847,12 +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);
Expand Down Expand Up @@ -3682,9 +3688,16 @@ 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;
#if IS_ENABLED(CONFIG_IPV6)
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)
Expand All @@ -3694,6 +3707,7 @@ static int smack_socket_sendmsg(struct socket *sock, struct msghdr *msg,
#ifdef SMACK_IPV6_PORT_LABELING
rc = smk_ipv6_port_check(sock->sk, sap, SMK_SENDING);
#endif
#endif /* IS_ENABLED(CONFIG_IPV6) */
break;
}
return rc;
Expand Down Expand Up @@ -3906,6 +3920,8 @@ static int smack_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb)
#ifdef SMACK_IPV6_SECMARK_LABELING
if (skb && skb->secmark != 0)
skp = smack_from_secid(skb->secmark);
else if (smk_ipv6_localhost(&sadd))
break;
else
skp = smack_ipv6host_label(&sadd);
if (skp == NULL)
Expand Down Expand Up @@ -4758,6 +4774,12 @@ static __init int smack_init(void)
if (!smack_inode_cache)
return -ENOMEM;

smack_rule_cache = KMEM_CACHE(smack_rule, 0);
if (!smack_rule_cache) {
kmem_cache_destroy(smack_inode_cache);
return -ENOMEM;
}

/*
* Set the security state for the initial task.
*/
Expand Down
55 changes: 16 additions & 39 deletions security/smack/smackfs.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -67,7 +67,6 @@ enum smk_inos {
/*
* List locks
*/
static DEFINE_MUTEX(smack_master_list_lock);
static DEFINE_MUTEX(smack_cipso_lock);
static DEFINE_MUTEX(smack_ambient_lock);
static DEFINE_MUTEX(smk_net4addr_lock);
Expand Down Expand Up @@ -134,15 +133,7 @@ LIST_HEAD(smk_net6addr_list);

/*
* Rule lists are maintained for each label.
* This master list is just for reading /smack/load and /smack/load2.
*/
struct smack_master_list {
struct list_head list;
struct smack_rule *smk_rule;
};

static LIST_HEAD(smack_rule_list);

struct smack_parsed_rule {
struct smack_known *smk_subject;
struct smack_known *smk_object;
Expand Down Expand Up @@ -211,7 +202,6 @@ static void smk_netlabel_audit_set(struct netlbl_audit *nap)
* @srp: the rule to add or replace
* @rule_list: the list of rules
* @rule_lock: the rule list lock
* @global: if non-zero, indicates a global rule
*
* Looks through the current subject/object/access list for
* the subject/object pair and replaces the access that was
Expand All @@ -223,10 +213,9 @@ static void smk_netlabel_audit_set(struct netlbl_audit *nap)
*/
static int smk_set_access(struct smack_parsed_rule *srp,
struct list_head *rule_list,
struct mutex *rule_lock, int global)
struct mutex *rule_lock)
{
struct smack_rule *sp;
struct smack_master_list *smlp;
int found = 0;
int rc = 0;

Expand All @@ -247,7 +236,7 @@ static int smk_set_access(struct smack_parsed_rule *srp,
}

if (found == 0) {
sp = kzalloc(sizeof(*sp), GFP_KERNEL);
sp = kmem_cache_zalloc(smack_rule_cache, GFP_KERNEL);
if (sp == NULL) {
rc = -ENOMEM;
goto out;
Expand All @@ -258,22 +247,6 @@ static int smk_set_access(struct smack_parsed_rule *srp,
sp->smk_access = srp->smk_access1 & ~srp->smk_access2;

list_add_rcu(&sp->list, rule_list);
/*
* If this is a global as opposed to self and a new rule
* it needs to get added for reporting.
*/
if (global) {
mutex_unlock(rule_lock);
smlp = kzalloc(sizeof(*smlp), GFP_KERNEL);
if (smlp != NULL) {
smlp->smk_rule = sp;
mutex_lock(&smack_master_list_lock);
list_add_rcu(&smlp->list, &smack_rule_list);
mutex_unlock(&smack_master_list_lock);
} else
rc = -ENOMEM;
return rc;
}
}

out:
Expand Down Expand Up @@ -540,9 +513,9 @@ static ssize_t smk_write_rules_list(struct file *file, const char __user *buf,

if (rule_list == NULL)
rc = smk_set_access(&rule, &rule.smk_subject->smk_rules,
&rule.smk_subject->smk_rules_lock, 1);
&rule.smk_subject->smk_rules_lock);
else
rc = smk_set_access(&rule, rule_list, rule_lock, 0);
rc = smk_set_access(&rule, rule_list, rule_lock);

if (rc)
goto out;
Expand Down Expand Up @@ -636,21 +609,23 @@ static void smk_rule_show(struct seq_file *s, struct smack_rule *srp, int max)

static void *load2_seq_start(struct seq_file *s, loff_t *pos)
{
return smk_seq_start(s, pos, &smack_rule_list);
return smk_seq_start(s, pos, &smack_known_list);
}

static void *load2_seq_next(struct seq_file *s, void *v, loff_t *pos)
{
return smk_seq_next(s, v, pos, &smack_rule_list);
return smk_seq_next(s, v, pos, &smack_known_list);
}

static int load_seq_show(struct seq_file *s, void *v)
{
struct list_head *list = v;
struct smack_master_list *smlp =
list_entry_rcu(list, struct smack_master_list, list);
struct smack_rule *srp;
struct smack_known *skp =
list_entry_rcu(list, struct smack_known, list);

smk_rule_show(s, smlp->smk_rule, SMK_LABELLEN);
list_for_each_entry_rcu(srp, &skp->smk_rules, list)
smk_rule_show(s, srp, SMK_LABELLEN);

return 0;
}
Expand Down Expand Up @@ -2352,10 +2327,12 @@ static const struct file_operations smk_access_ops = {
static int load2_seq_show(struct seq_file *s, void *v)
{
struct list_head *list = v;
struct smack_master_list *smlp =
list_entry_rcu(list, struct smack_master_list, list);
struct smack_rule *srp;
struct smack_known *skp =
list_entry_rcu(list, struct smack_known, list);

smk_rule_show(s, smlp->smk_rule, SMK_LONGLABEL);
list_for_each_entry_rcu(srp, &skp->smk_rules, list)
smk_rule_show(s, srp, SMK_LONGLABEL);

return 0;
}
Expand Down

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