aboutsummaryrefslogtreecommitdiff
path: root/security/smack/smackfs.c
diff options
context:
space:
mode:
Diffstat (limited to 'security/smack/smackfs.c')
-rw-r--r--security/smack/smackfs.c218
1 files changed, 131 insertions, 87 deletions
diff --git a/security/smack/smackfs.c b/security/smack/smackfs.c
index a1b57e4dba3..e03a7e19c73 100644
--- a/security/smack/smackfs.c
+++ b/security/smack/smackfs.c
@@ -80,10 +80,14 @@ char *smack_onlycap;
* Packets are sent there unlabeled, but only from tasks that
* can write to the specified label.
*/
-struct smk_netlbladdr *smack_netlbladdrs;
+
+LIST_HEAD(smk_netlbladdr_list);
+LIST_HEAD(smack_rule_list);
static int smk_cipso_doi_value = SMACK_CIPSO_DOI_DEFAULT;
-struct smk_list_entry *smack_list;
+
+const char *smack_cipso_option = SMACK_CIPSO_OPTION;
+
#define SEQ_READ_FINISHED 1
@@ -134,24 +138,27 @@ static void *load_seq_start(struct seq_file *s, loff_t *pos)
{
if (*pos == SEQ_READ_FINISHED)
return NULL;
-
- return smack_list;
+ if (list_empty(&smack_rule_list))
+ return NULL;
+ return smack_rule_list.next;
}
static void *load_seq_next(struct seq_file *s, void *v, loff_t *pos)
{
- struct smk_list_entry *skp = ((struct smk_list_entry *) v)->smk_next;
+ struct list_head *list = v;
- if (skp == NULL)
+ if (list_is_last(list, &smack_rule_list)) {
*pos = SEQ_READ_FINISHED;
-
- return skp;
+ return NULL;
+ }
+ return list->next;
}
static int load_seq_show(struct seq_file *s, void *v)
{
- struct smk_list_entry *slp = (struct smk_list_entry *) v;
- struct smack_rule *srp = &slp->smk_rule;
+ struct list_head *list = v;
+ struct smack_rule *srp =
+ list_entry(list, struct smack_rule, list);
seq_printf(s, "%s %s", (char *)srp->smk_subject,
(char *)srp->smk_object);
@@ -212,32 +219,23 @@ static int smk_open_load(struct inode *inode, struct file *file)
*/
static int smk_set_access(struct smack_rule *srp)
{
- struct smk_list_entry *sp;
- struct smk_list_entry *newp;
+ struct smack_rule *sp;
int ret = 0;
-
+ int found;
mutex_lock(&smack_list_lock);
- for (sp = smack_list; sp != NULL; sp = sp->smk_next)
- if (sp->smk_rule.smk_subject == srp->smk_subject &&
- sp->smk_rule.smk_object == srp->smk_object) {
- sp->smk_rule.smk_access = srp->smk_access;
+ found = 0;
+ list_for_each_entry_rcu(sp, &smack_rule_list, list) {
+ if (sp->smk_subject == srp->smk_subject &&
+ sp->smk_object == srp->smk_object) {
+ found = 1;
+ sp->smk_access = srp->smk_access;
break;
}
-
- if (sp == NULL) {
- newp = kzalloc(sizeof(struct smk_list_entry), GFP_KERNEL);
- if (newp == NULL) {
- ret = -ENOMEM;
- goto out;
- }
-
- newp->smk_rule = *srp;
- newp->smk_next = smack_list;
- smack_list = newp;
}
+ if (found == 0)
+ list_add_rcu(&srp->list, &smack_rule_list);
-out:
mutex_unlock(&smack_list_lock);
return ret;
@@ -261,7 +259,7 @@ out:
static ssize_t smk_write_load(struct file *file, const char __user *buf,
size_t count, loff_t *ppos)
{
- struct smack_rule rule;
+ struct smack_rule *rule;
char *data;
int rc = -EINVAL;
@@ -272,9 +270,8 @@ static ssize_t smk_write_load(struct file *file, const char __user *buf,
*/
if (!capable(CAP_MAC_ADMIN))
return -EPERM;
- if (*ppos != 0)
- return -EINVAL;
- if (count != SMK_LOADLEN)
+
+ if (*ppos != 0 || count != SMK_LOADLEN)
return -EINVAL;
data = kzalloc(count, GFP_KERNEL);
@@ -286,25 +283,31 @@ static ssize_t smk_write_load(struct file *file, const char __user *buf,
goto out;
}
- rule.smk_subject = smk_import(data, 0);
- if (rule.smk_subject == NULL)
+ rule = kzalloc(sizeof(*rule), GFP_KERNEL);
+ if (rule == NULL) {
+ rc = -ENOMEM;
goto out;
+ }
- rule.smk_object = smk_import(data + SMK_LABELLEN, 0);
- if (rule.smk_object == NULL)
- goto out;
+ rule->smk_subject = smk_import(data, 0);
+ if (rule->smk_subject == NULL)
+ goto out_free_rule;
- rule.smk_access = 0;
+ rule->smk_object = smk_import(data + SMK_LABELLEN, 0);
+ if (rule->smk_object == NULL)
+ goto out_free_rule;
+
+ rule->smk_access = 0;
switch (data[SMK_LABELLEN + SMK_LABELLEN]) {
case '-':
break;
case 'r':
case 'R':
- rule.smk_access |= MAY_READ;
+ rule->smk_access |= MAY_READ;
break;
default:
- goto out;
+ goto out_free_rule;
}
switch (data[SMK_LABELLEN + SMK_LABELLEN + 1]) {
@@ -312,10 +315,10 @@ static ssize_t smk_write_load(struct file *file, const char __user *buf,
break;
case 'w':
case 'W':
- rule.smk_access |= MAY_WRITE;
+ rule->smk_access |= MAY_WRITE;
break;
default:
- goto out;
+ goto out_free_rule;
}
switch (data[SMK_LABELLEN + SMK_LABELLEN + 2]) {
@@ -323,10 +326,10 @@ static ssize_t smk_write_load(struct file *file, const char __user *buf,
break;
case 'x':
case 'X':
- rule.smk_access |= MAY_EXEC;
+ rule->smk_access |= MAY_EXEC;
break;
default:
- goto out;
+ goto out_free_rule;
}
switch (data[SMK_LABELLEN + SMK_LABELLEN + 3]) {
@@ -334,17 +337,20 @@ static ssize_t smk_write_load(struct file *file, const char __user *buf,
break;
case 'a':
case 'A':
- rule.smk_access |= MAY_APPEND;
+ rule->smk_access |= MAY_APPEND;
break;
default:
- goto out;
+ goto out_free_rule;
}
- rc = smk_set_access(&rule);
+ rc = smk_set_access(rule);
if (!rc)
rc = count;
+ goto out;
+out_free_rule:
+ kfree(rule);
out:
kfree(data);
return rc;
@@ -433,24 +439,26 @@ static void *cipso_seq_start(struct seq_file *s, loff_t *pos)
{
if (*pos == SEQ_READ_FINISHED)
return NULL;
+ if (list_empty(&smack_known_list))
+ return NULL;
- return smack_known;
+ return smack_known_list.next;
}
static void *cipso_seq_next(struct seq_file *s, void *v, loff_t *pos)
{
- struct smack_known *skp = ((struct smack_known *) v)->smk_next;
+ struct list_head *list = v;
/*
- * Omit labels with no associated cipso value
+ * labels with no associated cipso value wont be printed
+ * in cipso_seq_show
*/
- while (skp != NULL && !skp->smk_cipso)
- skp = skp->smk_next;
-
- if (skp == NULL)
+ if (list_is_last(list, &smack_known_list)) {
*pos = SEQ_READ_FINISHED;
+ return NULL;
+ }
- return skp;
+ return list->next;
}
/*
@@ -459,7 +467,9 @@ static void *cipso_seq_next(struct seq_file *s, void *v, loff_t *pos)
*/
static int cipso_seq_show(struct seq_file *s, void *v)
{
- struct smack_known *skp = (struct smack_known *) v;
+ struct list_head *list = v;
+ struct smack_known *skp =
+ list_entry(list, struct smack_known, list);
struct smack_cipso *scp = skp->smk_cipso;
char *cbp;
char sep = '/';
@@ -558,6 +568,11 @@ static ssize_t smk_write_cipso(struct file *file, const char __user *buf,
goto unlockedout;
}
+ /* labels cannot begin with a '-' */
+ if (data[0] == '-') {
+ rc = -EINVAL;
+ goto unlockedout;
+ }
data[count] = '\0';
rule = data;
/*
@@ -638,18 +653,21 @@ static void *netlbladdr_seq_start(struct seq_file *s, loff_t *pos)
{
if (*pos == SEQ_READ_FINISHED)
return NULL;
-
- return smack_netlbladdrs;
+ if (list_empty(&smk_netlbladdr_list))
+ return NULL;
+ return smk_netlbladdr_list.next;
}
static void *netlbladdr_seq_next(struct seq_file *s, void *v, loff_t *pos)
{
- struct smk_netlbladdr *skp = ((struct smk_netlbladdr *) v)->smk_next;
+ struct list_head *list = v;
- if (skp == NULL)
+ if (list_is_last(list, &smk_netlbladdr_list)) {
*pos = SEQ_READ_FINISHED;
+ return NULL;
+ }
- return skp;
+ return list->next;
}
#define BEBITS (sizeof(__be32) * 8)
@@ -658,7 +676,9 @@ static void *netlbladdr_seq_next(struct seq_file *s, void *v, loff_t *pos)
*/
static int netlbladdr_seq_show(struct seq_file *s, void *v)
{
- struct smk_netlbladdr *skp = (struct smk_netlbladdr *) v;
+ struct list_head *list = v;
+ struct smk_netlbladdr *skp =
+ list_entry(list, struct smk_netlbladdr, list);
unsigned char *hp = (char *) &skp->smk_host.sin_addr.s_addr;
int maskn;
u32 temp_mask = be32_to_cpu(skp->smk_mask.s_addr);
@@ -702,30 +722,36 @@ static int smk_open_netlbladdr(struct inode *inode, struct file *file)
*
* This helper insert netlabel in the smack_netlbladdrs list
* sorted by netmask length (longest to smallest)
+ * locked by &smk_netlbladdr_lock in smk_write_netlbladdr
+ *
*/
static void smk_netlbladdr_insert(struct smk_netlbladdr *new)
{
- struct smk_netlbladdr *m;
+ struct smk_netlbladdr *m, *m_next;
- if (smack_netlbladdrs == NULL) {
- smack_netlbladdrs = new;
+ if (list_empty(&smk_netlbladdr_list)) {
+ list_add_rcu(&new->list, &smk_netlbladdr_list);
return;
}
+ m = list_entry(rcu_dereference(smk_netlbladdr_list.next),
+ struct smk_netlbladdr, list);
+
/* the comparison '>' is a bit hacky, but works */
- if (new->smk_mask.s_addr > smack_netlbladdrs->smk_mask.s_addr) {
- new->smk_next = smack_netlbladdrs;
- smack_netlbladdrs = new;
+ if (new->smk_mask.s_addr > m->smk_mask.s_addr) {
+ list_add_rcu(&new->list, &smk_netlbladdr_list);
return;
}
- for (m = smack_netlbladdrs; m != NULL; m = m->smk_next) {
- if (m->smk_next == NULL) {
- m->smk_next = new;
+
+ list_for_each_entry_rcu(m, &smk_netlbladdr_list, list) {
+ if (list_is_last(&m->list, &smk_netlbladdr_list)) {
+ list_add_rcu(&new->list, &m->list);
return;
}
- if (new->smk_mask.s_addr > m->smk_next->smk_mask.s_addr) {
- new->smk_next = m->smk_next;
- m->smk_next = new;
+ m_next = list_entry(rcu_dereference(m->list.next),
+ struct smk_netlbladdr, list);
+ if (new->smk_mask.s_addr > m_next->smk_mask.s_addr) {
+ list_add_rcu(&new->list, &m->list);
return;
}
}
@@ -755,6 +781,7 @@ static ssize_t smk_write_netlbladdr(struct file *file, const char __user *buf,
struct netlbl_audit audit_info;
struct in_addr mask;
unsigned int m;
+ int found;
u32 mask_bits = (1<<31);
__be32 nsa;
u32 temp_mask;
@@ -789,9 +816,18 @@ static ssize_t smk_write_netlbladdr(struct file *file, const char __user *buf,
if (m > BEBITS)
return -EINVAL;
- sp = smk_import(smack, 0);
- if (sp == NULL)
- return -EINVAL;
+ /* if smack begins with '-', its an option, don't import it */
+ if (smack[0] != '-') {
+ sp = smk_import(smack, 0);
+ if (sp == NULL)
+ return -EINVAL;
+ } else {
+ /* check known options */
+ if (strcmp(smack, smack_cipso_option) == 0)
+ sp = (char *)smack_cipso_option;
+ else
+ return -EINVAL;
+ }
for (temp_mask = 0; m > 0; m--) {
temp_mask |= mask_bits;
@@ -808,14 +844,17 @@ static ssize_t smk_write_netlbladdr(struct file *file, const char __user *buf,
nsa = newname.sin_addr.s_addr;
/* try to find if the prefix is already in the list */
- for (skp = smack_netlbladdrs; skp != NULL; skp = skp->smk_next)
+ found = 0;
+ list_for_each_entry_rcu(skp, &smk_netlbladdr_list, list) {
if (skp->smk_host.sin_addr.s_addr == nsa &&
- skp->smk_mask.s_addr == mask.s_addr)
+ skp->smk_mask.s_addr == mask.s_addr) {
+ found = 1;
break;
-
+ }
+ }
smk_netlabel_audit_set(&audit_info);
- if (skp == NULL) {
+ if (found == 0) {
skp = kzalloc(sizeof(*skp), GFP_KERNEL);
if (skp == NULL)
rc = -ENOMEM;
@@ -827,18 +866,23 @@ static ssize_t smk_write_netlbladdr(struct file *file, const char __user *buf,
smk_netlbladdr_insert(skp);
}
} else {
- rc = netlbl_cfg_unlbl_static_del(&init_net, NULL,
- &skp->smk_host.sin_addr, &skp->smk_mask,
- PF_INET, &audit_info);
+ /* we delete the unlabeled entry, only if the previous label
+ * wasnt the special CIPSO option */
+ if (skp->smk_label != smack_cipso_option)
+ rc = netlbl_cfg_unlbl_static_del(&init_net, NULL,
+ &skp->smk_host.sin_addr, &skp->smk_mask,
+ PF_INET, &audit_info);
+ else
+ rc = 0;
skp->smk_label = sp;
}
/*
* Now tell netlabel about the single label nature of
* this host so that incoming packets get labeled.
+ * but only if we didn't get the special CIPSO option
*/
-
- if (rc == 0)
+ if (rc == 0 && sp != smack_cipso_option)
rc = netlbl_cfg_unlbl_static_add(&init_net, NULL,
&skp->smk_host.sin_addr, &skp->smk_mask, PF_INET,
smack_to_secid(skp->smk_label), &audit_info);