---

yaml
---
r: 85789
b: refs/heads/master
c: 4bc87e6
h: refs/heads/master
i:
  85787: dede930
v: v3

[refs]

@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 9a4c8546f3e7c893888bccc2b3416d6214f2664a
+refs/heads/master: 4bc87e62775052aac0be7574d5f84ff06f61c6b4

trunk/security/smack/smack_lsm.c

@@ -1251,9 +1251,8 @@ static void smack_to_secattr(char *smack, struct netlbl_lsm_secattr *nlsp)
 
 	switch (smack_net_nltype) {
 	case NETLBL_NLTYPE_CIPSOV4:
-		nlsp->domain = NULL;
-		nlsp->flags = NETLBL_SECATTR_DOMAIN;
-		nlsp->flags |= NETLBL_SECATTR_MLS_LVL;
+		nlsp->domain = kstrdup(smack, GFP_ATOMIC);
+		nlsp->flags = NETLBL_SECATTR_DOMAIN | NETLBL_SECATTR_MLS_LVL;
 
 		rc = smack_to_cipso(smack, &cipso);
 		if (rc == 0) {
@@ -1282,15 +1281,14 @@ static int smack_netlabel(struct sock *sk)
 {
 	struct socket_smack *ssp;
 	struct netlbl_lsm_secattr secattr;
-	int rc = 0;
+	int rc;
 
 	ssp = sk->sk_security;
 	netlbl_secattr_init(&secattr);
 	smack_to_secattr(ssp->smk_out, &secattr);
-	if (secattr.flags != NETLBL_SECATTR_NONE)
-		rc = netlbl_sock_setattr(sk, &secattr);
-
+	rc = netlbl_sock_setattr(sk, &secattr);
 	netlbl_secattr_destroy(&secattr);
+
 	return rc;
 }
 
@@ -1313,6 +1311,7 @@ static int smack_inode_setsecurity(struct inode *inode, const char *name,
 	struct inode_smack *nsp = inode->i_security;
 	struct socket_smack *ssp;
 	struct socket *sock;
+	int rc = 0;
 
 	if (value == NULL || size > SMK_LABELLEN)
 		return -EACCES;
@@ -1341,7 +1340,10 @@ static int smack_inode_setsecurity(struct inode *inode, const char *name,
 		ssp->smk_in = sp;
 	else if (strcmp(name, XATTR_SMACK_IPOUT) == 0) {
 		ssp->smk_out = sp;
-		return smack_netlabel(sock->sk);
+		rc = smack_netlabel(sock->sk);
+		if (rc != 0)
+			printk(KERN_WARNING "Smack: \"%s\" netlbl error %d.\n",
+			       __func__, -rc);
 	} else
 		return -EOPNOTSUPP;
 
@@ -2214,6 +2216,9 @@ static void smack_sock_graft(struct sock *sk, struct socket *parent)
 	ssp->smk_packet[0] = '\0';
 
 	rc = smack_netlabel(sk);
+	if (rc != 0)
+		printk(KERN_WARNING "Smack: \"%s\" netlbl error %d.\n",
+		       __func__, -rc);
 }
 
 /**
@@ -2345,6 +2350,20 @@ static int smack_secid_to_secctx(u32 secid, char **secdata, u32 *seclen)
 	return 0;
 }
 
+/*
+ * smack_secctx_to_secid - return the secid for a smack label
+ * @secdata: smack label
+ * @seclen: how long result is
+ * @secid: outgoing integer
+ *
+ * Exists for audit and networking code.
+ */
+static int smack_secctx_to_secid(char *secdata, u32 seclen, u32 *secid)
+{
+	*secid = smack_to_secid(secdata);
+	return 0;
+}
+
 /*
  * smack_release_secctx - don't do anything.
  * @key_ref: unused
@@ -2475,6 +2494,7 @@ static struct security_operations smack_ops = {
 	.key_permission = 		smack_key_permission,
 #endif /* CONFIG_KEYS */
 	.secid_to_secctx = 		smack_secid_to_secctx,
+	.secctx_to_secid = 		smack_secctx_to_secid,
 	.release_secctx = 		smack_release_secctx,
 };
 

trunk/security/smack/smackfs.c

@@ -24,6 +24,7 @@
 #include <net/cipso_ipv4.h>
 #include <linux/seq_file.h>
 #include <linux/ctype.h>
+#include <linux/audit.h>
 #include "smack.h"
 
 /*
@@ -45,6 +46,7 @@ enum smk_inos {
  */
 static DEFINE_MUTEX(smack_list_lock);
 static DEFINE_MUTEX(smack_cipso_lock);
+static DEFINE_MUTEX(smack_ambient_lock);
 
 /*
  * This is the "ambient" label for network traffic.
@@ -342,6 +344,9 @@ void smk_cipso_doi(void)
 	struct cipso_v4_doi *doip;
 	struct netlbl_audit audit_info;
 
+	audit_info.loginuid = audit_get_loginuid(current);
+	audit_info.secid = smack_to_secid(current->security);
+
 	rc = netlbl_cfg_map_del(NULL, &audit_info);
 	if (rc != 0)
 		printk(KERN_WARNING "%s:%d remove rc = %d\n",
@@ -363,6 +368,30 @@ void smk_cipso_doi(void)
 		       __func__, __LINE__, rc);
 }
 
+/**
+ * smk_unlbl_ambient - initialize the unlabeled domain
+ */
+void smk_unlbl_ambient(char *oldambient)
+{
+	int rc;
+	struct netlbl_audit audit_info;
+
+	audit_info.loginuid = audit_get_loginuid(current);
+	audit_info.secid = smack_to_secid(current->security);
+
+	if (oldambient != NULL) {
+		rc = netlbl_cfg_map_del(oldambient, &audit_info);
+		if (rc != 0)
+			printk(KERN_WARNING "%s:%d remove rc = %d\n",
+			       __func__, __LINE__, rc);
+	}
+
+	rc = netlbl_cfg_unlbl_add_map(smack_net_ambient, &audit_info);
+	if (rc != 0)
+		printk(KERN_WARNING "%s:%d add rc = %d\n",
+		       __func__, __LINE__, rc);
+}
+
 /*
  * Seq_file read operations for /smack/cipso
  */
@@ -709,31 +738,25 @@ static ssize_t smk_read_ambient(struct file *filp, char __user *buf,
 				size_t cn, loff_t *ppos)
 {
 	ssize_t rc;
-	char out[SMK_LABELLEN];
 	int asize;
 
 	if (*ppos != 0)
 		return 0;
 	/*
 	 * Being careful to avoid a problem in the case where
 	 * smack_net_ambient gets changed in midstream.
-	 * Since smack_net_ambient is always set with a value
-	 * from the label list, including initially, and those
-	 * never get freed, the worst case is that the pointer
-	 * gets changed just after this strncpy, in which case
-	 * the value passed up is incorrect. Locking around
-	 * smack_net_ambient wouldn't be any better than this
-	 * copy scheme as by the time the caller got to look
-	 * at the ambient value it would have cleared the lock
-	 * and been changed.
 	 */
-	strncpy(out, smack_net_ambient, SMK_LABELLEN);
-	asize = strlen(out) + 1;
+	mutex_lock(&smack_ambient_lock);
 
-	if (cn < asize)
-		return -EINVAL;
+	asize = strlen(smack_net_ambient) + 1;
+
+	if (cn >= asize)
+		rc = simple_read_from_buffer(buf, cn, ppos,
+					     smack_net_ambient, asize);
+	else
+		rc = -EINVAL;
 
-	rc = simple_read_from_buffer(buf, cn, ppos, out, asize);
+	mutex_unlock(&smack_ambient_lock);
 
 	return rc;
 }
@@ -751,6 +774,7 @@ static ssize_t smk_write_ambient(struct file *file, const char __user *buf,
 				 size_t count, loff_t *ppos)
 {
 	char in[SMK_LABELLEN];
+	char *oldambient;
 	char *smack;
 
 	if (!capable(CAP_MAC_ADMIN))
@@ -766,7 +790,13 @@ static ssize_t smk_write_ambient(struct file *file, const char __user *buf,
 	if (smack == NULL)
 		return -EINVAL;
 
+	mutex_lock(&smack_ambient_lock);
+
+	oldambient = smack_net_ambient;
 	smack_net_ambient = smack;
+	smk_unlbl_ambient(oldambient);
+
+	mutex_unlock(&smack_ambient_lock);
 
 	return count;
 }
@@ -974,6 +1004,7 @@ static int __init init_smk_fs(void)
 
 	sema_init(&smack_write_sem, 1);
 	smk_cipso_doi();
+	smk_unlbl_ambient(NULL);
 
 	return err;
 }