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Merge branch 'smack-for-5.2' of https://github.com/cschaufler/next-smack into next-smack

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From Casey: "There's one bug fix for
IPv6 handling and two memory use improvements."
This commit is contained in:
James Morris 2019-04-15 17:31:32 -07:00
commit f075b344c6
3 changed files with 28 additions and 41 deletions
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1
security/smack/smack.h
View File

@ -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)
{

13
security/smack/smack_lsm.c
View File

@ -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}
@ -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;
@ -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);
}
}
@ -3906,6 +3907,8 @@ access_check:
#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)
@ -4758,6 +4761,12 @@ 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.
*/

55
security/smack/smackfs.c
View File

@ -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);
@ -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;
@ -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
@ -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;
@ -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;
@ -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:
@ -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;
@ -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;
}
@ -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;
}