Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security

Pull security layer updates from James Morris:
 "Changes for this kernel include maintenance updates for Smack, SELinux
  (and several networking fixes), IMA and TPM"

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security: (39 commits)
  SELinux: Fix memory leak upon loading policy
  tpm/tpm-sysfs: active_show() can be static
  tpm: tpm_tis: Fix compile problems with CONFIG_PM_SLEEP/CONFIG_PNP
  tpm: Make tpm-dev allocate a per-file structure
  tpm: Use the ops structure instead of a copy in tpm_vendor_specific
  tpm: Create a tpm_class_ops structure and use it in the drivers
  tpm: Pull all driver sysfs code into tpm-sysfs.c
  tpm: Move sysfs functions from tpm-interface to tpm-sysfs
  tpm: Pull everything related to /dev/tpmX into tpm-dev.c
  char: tpm: nuvoton: remove unused variable
  tpm: MAINTAINERS: Cleanup TPM Maintainers file
  tpm/tpm_i2c_atmel: fix coccinelle warnings
  tpm/tpm_ibmvtpm: fix unreachable code warning (smatch warning)
  tpm/tpm_i2c_stm_st33: Check return code of get_burstcount
  tpm/tpm_ppi: Check return value of acpi_get_name
  tpm/tpm_ppi: Do not compare strcmp(a,b) == -1
  ima: remove unneeded size_limit argument from ima_eventdigest_init_common()
  ima: update IMA-templates.txt documentation
  ima: pass HASH_ALGO__LAST as hash algo in ima_eventdigest_init()
  ima: change the default hash algorithm to SHA1 in ima_eventdigest_ng_init()
  ...

security/integrity/ima/ima_template_lib.c

@@ -162,8 +162,7 @@ void ima_show_template_sig(struct seq_file *m, enum ima_show_type show,
 }
 
 static int ima_eventdigest_init_common(u8 *digest, u32 digestsize, u8 hash_algo,
-				       struct ima_field_data *field_data,
-				       bool size_limit)
+				       struct ima_field_data *field_data)
 {
 	/*
 	 * digest formats:
@@ -176,11 +175,10 @@ static int ima_eventdigest_init_common(u8 *digest, u32 digestsize, u8 hash_algo,
 	enum data_formats fmt = DATA_FMT_DIGEST;
 	u32 offset = 0;
 
-	if (!size_limit) {
+	if (hash_algo < HASH_ALGO__LAST) {
 		fmt = DATA_FMT_DIGEST_WITH_ALGO;
-		if (hash_algo < HASH_ALGO__LAST)
-			offset += snprintf(buffer, CRYPTO_MAX_ALG_NAME + 1,
-					   "%s", hash_algo_name[hash_algo]);
+		offset += snprintf(buffer, CRYPTO_MAX_ALG_NAME + 1, "%s",
+				   hash_algo_name[hash_algo]);
 		buffer[offset] = ':';
 		offset += 2;
 	}
@@ -243,8 +241,8 @@ int ima_eventdigest_init(struct integrity_iint_cache *iint, struct file *file,
 	cur_digest = hash.hdr.digest;
 	cur_digestsize = hash.hdr.length;
 out:
-	return ima_eventdigest_init_common(cur_digest, cur_digestsize, -1,
-					   field_data, true);
+	return ima_eventdigest_init_common(cur_digest, cur_digestsize,
+					   HASH_ALGO__LAST, field_data);
 }
 
 /*
@@ -255,7 +253,7 @@ int ima_eventdigest_ng_init(struct integrity_iint_cache *iint,
 			    struct evm_ima_xattr_data *xattr_value,
 			    int xattr_len, struct ima_field_data *field_data)
 {
-	u8 *cur_digest = NULL, hash_algo = HASH_ALGO__LAST;
+	u8 *cur_digest = NULL, hash_algo = HASH_ALGO_SHA1;
 	u32 cur_digestsize = 0;
 
 	/* If iint is NULL, we are recording a violation. */
@@ -268,7 +266,7 @@ int ima_eventdigest_ng_init(struct integrity_iint_cache *iint,
 	hash_algo = iint->ima_hash->algo;
 out:
 	return ima_eventdigest_init_common(cur_digest, cur_digestsize,
-					   hash_algo, field_data, false);
+					   hash_algo, field_data);
 }
 
 static int ima_eventname_init_common(struct integrity_iint_cache *iint,

security/selinux/hooks.c

@@ -82,7 +82,6 @@
 #include <linux/syslog.h>
 #include <linux/user_namespace.h>
 #include <linux/export.h>
-#include <linux/security.h>
 #include <linux/msg.h>
 #include <linux/shm.h>
 
@@ -4490,14 +4489,10 @@ static int selinux_inet_conn_request(struct sock *sk, struct sk_buff *skb,
 {
 	struct sk_security_struct *sksec = sk->sk_security;
 	int err;
-	u16 family = sk->sk_family;
+	u16 family = req->rsk_ops->family;
 	u32 connsid;
 	u32 peersid;
 
-	/* handle mapped IPv4 packets arriving via IPv6 sockets */
-	if (family == PF_INET6 && skb->protocol == htons(ETH_P_IP))
-		family = PF_INET;
-
 	err = selinux_skb_peerlbl_sid(skb, family, &peersid);
 	if (err)
 		return err;

security/selinux/include/security.h

@@ -33,13 +33,14 @@
 #define POLICYDB_VERSION_ROLETRANS	26
 #define POLICYDB_VERSION_NEW_OBJECT_DEFAULTS	27
 #define POLICYDB_VERSION_DEFAULT_TYPE	28
+#define POLICYDB_VERSION_CONSTRAINT_NAMES	29
 
 /* Range of policy versions we understand*/
 #define POLICYDB_VERSION_MIN   POLICYDB_VERSION_BASE
 #ifdef CONFIG_SECURITY_SELINUX_POLICYDB_VERSION_MAX
 #define POLICYDB_VERSION_MAX	CONFIG_SECURITY_SELINUX_POLICYDB_VERSION_MAX_VALUE
 #else
-#define POLICYDB_VERSION_MAX	POLICYDB_VERSION_DEFAULT_TYPE
+#define POLICYDB_VERSION_MAX	POLICYDB_VERSION_CONSTRAINT_NAMES
 #endif
 
 /* Mask for just the mount related flags */

security/selinux/netlabel.c

@@ -100,6 +100,32 @@ static struct netlbl_lsm_secattr *selinux_netlbl_sock_genattr(struct sock *sk)
 	return secattr;
 }
 
+/**
+ * selinux_netlbl_sock_getattr - Get the cached NetLabel secattr
+ * @sk: the socket
+ * @sid: the SID
+ *
+ * Query the socket's cached secattr and if the SID matches the cached value
+ * return the cache, otherwise return NULL.
+ *
+ */
+static struct netlbl_lsm_secattr *selinux_netlbl_sock_getattr(
+							const struct sock *sk,
+							u32 sid)
+{
+	struct sk_security_struct *sksec = sk->sk_security;
+	struct netlbl_lsm_secattr *secattr = sksec->nlbl_secattr;
+
+	if (secattr == NULL)
+		return NULL;
+
+	if ((secattr->flags & NETLBL_SECATTR_SECID) &&
+	    (secattr->attr.secid == sid))
+		return secattr;
+
+	return NULL;
+}
+
 /**
  * selinux_netlbl_cache_invalidate - Invalidate the NetLabel cache
  *
@@ -224,7 +250,7 @@ int selinux_netlbl_skbuff_setsid(struct sk_buff *skb,
 		struct sk_security_struct *sksec = sk->sk_security;
 		if (sksec->nlbl_state != NLBL_REQSKB)
 			return 0;
-		secattr = sksec->nlbl_secattr;
+		secattr = selinux_netlbl_sock_getattr(sk, sid);
 	}
 	if (secattr == NULL) {
 		secattr = &secattr_storage;
@@ -410,6 +436,9 @@ int selinux_netlbl_socket_setsockopt(struct socket *sock,
 	     sksec->nlbl_state == NLBL_CONNLABELED)) {
 		netlbl_secattr_init(&secattr);
 		lock_sock(sk);
+		/* call the netlabel function directly as we want to see the
+		 * on-the-wire label that is assigned via the socket's options
+		 * and not the cached netlabel/lsm attributes */
 		rc = netlbl_sock_getattr(sk, &secattr);
 		release_sock(sk);
 		if (rc == 0)

security/selinux/ss/constraint.h

@@ -48,6 +48,7 @@ struct constraint_expr {
 	u32 op;			/* operator */
 
 	struct ebitmap names;	/* names */
+	struct type_set *type_names;
 
 	struct constraint_expr *next;   /* next expression */
 };

security/selinux/ss/policydb.c

@@ -143,6 +143,11 @@ static struct policydb_compat_info policydb_compat[] = {
 		.sym_num	= SYM_NUM,
 		.ocon_num	= OCON_NUM,
 	},
+	{
+		.version	= POLICYDB_VERSION_CONSTRAINT_NAMES,
+		.sym_num	= SYM_NUM,
+		.ocon_num	= OCON_NUM,
+	},
 };
 
 static struct policydb_compat_info *policydb_lookup_compat(int version)
@@ -613,6 +618,19 @@ static int common_destroy(void *key, void *datum, void *p)
 	return 0;
 }
 
+static void constraint_expr_destroy(struct constraint_expr *expr)
+{
+	if (expr) {
+		ebitmap_destroy(&expr->names);
+		if (expr->type_names) {
+			ebitmap_destroy(&expr->type_names->types);
+			ebitmap_destroy(&expr->type_names->negset);
+			kfree(expr->type_names);
+		}
+		kfree(expr);
+	}
+}
+
 static int cls_destroy(void *key, void *datum, void *p)
 {
 	struct class_datum *cladatum;
@@ -628,10 +646,9 @@ static int cls_destroy(void *key, void *datum, void *p)
 		while (constraint) {
 			e = constraint->expr;
 			while (e) {
-				ebitmap_destroy(&e->names);
 				etmp = e;
 				e = e->next;
-				kfree(etmp);
+				constraint_expr_destroy(etmp);
 			}
 			ctemp = constraint;
 			constraint = constraint->next;
@@ -642,16 +659,14 @@ static int cls_destroy(void *key, void *datum, void *p)
 		while (constraint) {
 			e = constraint->expr;
 			while (e) {
-				ebitmap_destroy(&e->names);
 				etmp = e;
 				e = e->next;
-				kfree(etmp);
+				constraint_expr_destroy(etmp);
 			}
 			ctemp = constraint;
 			constraint = constraint->next;
 			kfree(ctemp);
 		}
-
 		kfree(cladatum->comkey);
 	}
 	kfree(datum);
@@ -1156,8 +1171,34 @@ bad:
 	return rc;
 }
 
-static int read_cons_helper(struct constraint_node **nodep, int ncons,
-			    int allowxtarget, void *fp)
+static void type_set_init(struct type_set *t)
+{
+	ebitmap_init(&t->types);
+	ebitmap_init(&t->negset);
+}
+
+static int type_set_read(struct type_set *t, void *fp)
+{
+	__le32 buf[1];
+	int rc;
+
+	if (ebitmap_read(&t->types, fp))
+		return -EINVAL;
+	if (ebitmap_read(&t->negset, fp))
+		return -EINVAL;
+
+	rc = next_entry(buf, fp, sizeof(u32));
+	if (rc < 0)
+		return -EINVAL;
+	t->flags = le32_to_cpu(buf[0]);
+
+	return 0;
+}
+
+
+static int read_cons_helper(struct policydb *p,
+				struct constraint_node **nodep,
+				int ncons, int allowxtarget, void *fp)
 {
 	struct constraint_node *c, *lc;
 	struct constraint_expr *e, *le;
@@ -1225,6 +1266,18 @@ static int read_cons_helper(struct constraint_node **nodep, int ncons,
 				rc = ebitmap_read(&e->names, fp);
 				if (rc)
 					return rc;
+				if (p->policyvers >=
+					POLICYDB_VERSION_CONSTRAINT_NAMES) {
+						e->type_names = kzalloc(sizeof
+						(*e->type_names),
+						GFP_KERNEL);
+					if (!e->type_names)
+						return -ENOMEM;
+					type_set_init(e->type_names);
+					rc = type_set_read(e->type_names, fp);
+					if (rc)
+						return rc;
+				}
 				break;
 			default:
 				return -EINVAL;
@@ -1301,7 +1354,7 @@ static int class_read(struct policydb *p, struct hashtab *h, void *fp)
 			goto bad;
 	}
 
-	rc = read_cons_helper(&cladatum->constraints, ncons, 0, fp);
+	rc = read_cons_helper(p, &cladatum->constraints, ncons, 0, fp);
 	if (rc)
 		goto bad;
 
@@ -1311,7 +1364,8 @@ static int class_read(struct policydb *p, struct hashtab *h, void *fp)
 		if (rc)
 			goto bad;
 		ncons = le32_to_cpu(buf[0]);
-		rc = read_cons_helper(&cladatum->validatetrans, ncons, 1, fp);
+		rc = read_cons_helper(p, &cladatum->validatetrans,
+				ncons, 1, fp);
 		if (rc)
 			goto bad;
 	}
@@ -1941,7 +1995,19 @@ static int filename_trans_read(struct policydb *p, void *fp)
 		if (rc)
 			goto out;
 
-		hashtab_insert(p->filename_trans, ft, otype);
+		rc = hashtab_insert(p->filename_trans, ft, otype);
+		if (rc) {
+			/*
+			 * Do not return -EEXIST to the caller, or the system
+			 * will not boot.
+			 */
+			if (rc != -EEXIST)
+				goto out;
+			/* But free memory to avoid memory leak. */
+			kfree(ft);
+			kfree(name);
+			kfree(otype);
+		}
 	}
 	hash_eval(p->filename_trans, "filenametr");
 	return 0;
@@ -2753,6 +2819,24 @@ static int common_write(void *vkey, void *datum, void *ptr)
 	return 0;
 }
 
+static int type_set_write(struct type_set *t, void *fp)
+{
+	int rc;
+	__le32 buf[1];
+
+	if (ebitmap_write(&t->types, fp))
+		return -EINVAL;
+	if (ebitmap_write(&t->negset, fp))
+		return -EINVAL;
+
+	buf[0] = cpu_to_le32(t->flags);
+	rc = put_entry(buf, sizeof(u32), 1, fp);
+	if (rc)
+		return -EINVAL;
+
+	return 0;
+}
+
 static int write_cons_helper(struct policydb *p, struct constraint_node *node,
 			     void *fp)
 {
@@ -2784,6 +2868,12 @@ static int write_cons_helper(struct policydb *p, struct constraint_node *node,
 				rc = ebitmap_write(&e->names, fp);
 				if (rc)
 					return rc;
+				if (p->policyvers >=
+					POLICYDB_VERSION_CONSTRAINT_NAMES) {
+					rc = type_set_write(e->type_names, fp);
+					if (rc)
+						return rc;
+				}
 				break;
 			default:
 				break;

security/selinux/ss/policydb.h

@@ -153,6 +153,17 @@ struct cond_bool_datum {
 
 struct cond_node;
 
+/*
+ * type set preserves data needed to determine constraint info from
+ * policy source. This is not used by the kernel policy but allows
+ * utilities such as audit2allow to determine constraint denials.
+ */
+struct type_set {
+	struct ebitmap types;
+	struct ebitmap negset;
+	u32 flags;
+};
+
 /*
  * The configuration data includes security contexts for
  * initial SIDs, unlabeled file systems, TCP and UDP port numbers,

security/selinux/ss/services.c

@@ -1831,7 +1831,7 @@ static int security_preserve_bools(struct policydb *p);
  */
 int security_load_policy(void *data, size_t len)
 {
-	struct policydb oldpolicydb, newpolicydb;
+	struct policydb *oldpolicydb, *newpolicydb;
 	struct sidtab oldsidtab, newsidtab;
 	struct selinux_mapping *oldmap, *map = NULL;
 	struct convert_context_args args;
@@ -1840,12 +1840,19 @@ int security_load_policy(void *data, size_t len)
 	int rc = 0;
 	struct policy_file file = { data, len }, *fp = &file;
 
+	oldpolicydb = kzalloc(2 * sizeof(*oldpolicydb), GFP_KERNEL);
+	if (!oldpolicydb) {
+		rc = -ENOMEM;
+		goto out;
+	}
+	newpolicydb = oldpolicydb + 1;
+
 	if (!ss_initialized) {
 		avtab_cache_init();
 		rc = policydb_read(&policydb, fp);
 		if (rc) {
 			avtab_cache_destroy();
-			return rc;
+			goto out;
 		}
 
 		policydb.len = len;
@@ -1855,14 +1862,14 @@ int security_load_policy(void *data, size_t len)
 		if (rc) {
 			policydb_destroy(&policydb);
 			avtab_cache_destroy();
-			return rc;
+			goto out;
 		}
 
 		rc = policydb_load_isids(&policydb, &sidtab);
 		if (rc) {
 			policydb_destroy(&policydb);
 			avtab_cache_destroy();
-			return rc;
+			goto out;
 		}
 
 		security_load_policycaps();
@@ -1874,36 +1881,36 @@ int security_load_policy(void *data, size_t len)
 		selinux_status_update_policyload(seqno);
 		selinux_netlbl_cache_invalidate();
 		selinux_xfrm_notify_policyload();
-		return 0;
+		goto out;
 	}
 
 #if 0
 	sidtab_hash_eval(&sidtab, "sids");
 #endif
 
-	rc = policydb_read(&newpolicydb, fp);
+	rc = policydb_read(newpolicydb, fp);
 	if (rc)
-		return rc;
+		goto out;
 
-	newpolicydb.len = len;
+	newpolicydb->len = len;
 	/* If switching between different policy types, log MLS status */
-	if (policydb.mls_enabled && !newpolicydb.mls_enabled)
+	if (policydb.mls_enabled && !newpolicydb->mls_enabled)
 		printk(KERN_INFO "SELinux: Disabling MLS support...\n");
-	else if (!policydb.mls_enabled && newpolicydb.mls_enabled)
+	else if (!policydb.mls_enabled && newpolicydb->mls_enabled)
 		printk(KERN_INFO "SELinux: Enabling MLS support...\n");
 
-	rc = policydb_load_isids(&newpolicydb, &newsidtab);
+	rc = policydb_load_isids(newpolicydb, &newsidtab);
 	if (rc) {
 		printk(KERN_ERR "SELinux:  unable to load the initial SIDs\n");
-		policydb_destroy(&newpolicydb);
-		return rc;
+		policydb_destroy(newpolicydb);
+		goto out;
 	}
 
-	rc = selinux_set_mapping(&newpolicydb, secclass_map, &map, &map_size);
+	rc = selinux_set_mapping(newpolicydb, secclass_map, &map, &map_size);
 	if (rc)
 		goto err;
 
-	rc = security_preserve_bools(&newpolicydb);
+	rc = security_preserve_bools(newpolicydb);
 	if (rc) {
 		printk(KERN_ERR "SELinux:  unable to preserve booleans\n");
 		goto err;
@@ -1921,7 +1928,7 @@ int security_load_policy(void *data, size_t len)
 	 * in the new SID table.
 	 */
 	args.oldp = &policydb;
-	args.newp = &newpolicydb;
+	args.newp = newpolicydb;
 	rc = sidtab_map(&newsidtab, convert_context, &args);
 	if (rc) {
 		printk(KERN_ERR "SELinux:  unable to convert the internal"
@@ -1931,12 +1938,12 @@ int security_load_policy(void *data, size_t len)
 	}
 
 	/* Save the old policydb and SID table to free later. */
-	memcpy(&oldpolicydb, &policydb, sizeof policydb);
+	memcpy(oldpolicydb, &policydb, sizeof(policydb));
 	sidtab_set(&oldsidtab, &sidtab);
 
 	/* Install the new policydb and SID table. */
 	write_lock_irq(&policy_rwlock);
-	memcpy(&policydb, &newpolicydb, sizeof policydb);
+	memcpy(&policydb, newpolicydb, sizeof(policydb));
 	sidtab_set(&sidtab, &newsidtab);
 	security_load_policycaps();
 	oldmap = current_mapping;
@@ -1946,7 +1953,7 @@ int security_load_policy(void *data, size_t len)
 	write_unlock_irq(&policy_rwlock);
 
 	/* Free the old policydb and SID table. */
-	policydb_destroy(&oldpolicydb);
+	policydb_destroy(oldpolicydb);
 	sidtab_destroy(&oldsidtab);
 	kfree(oldmap);
 
@@ -1956,14 +1963,17 @@ int security_load_policy(void *data, size_t len)
 	selinux_netlbl_cache_invalidate();
 	selinux_xfrm_notify_policyload();
 
-	return 0;
+	rc = 0;
+	goto out;
 
 err:
 	kfree(map);
 	sidtab_destroy(&newsidtab);
-	policydb_destroy(&newpolicydb);
-	return rc;
+	policydb_destroy(newpolicydb);
 
+out:
+	kfree(oldpolicydb);
+	return rc;
 }
 
 size_t security_policydb_len(void)

security/smack/smack.h

@@ -241,7 +241,8 @@ u32 smack_to_secid(const char *);
 extern int smack_cipso_direct;
 extern int smack_cipso_mapped;
 extern struct smack_known *smack_net_ambient;
-extern char *smack_onlycap;
+extern struct smack_known *smack_onlycap;
+extern struct smack_known *smack_syslog_label;
 extern const char *smack_cipso_option;
 
 extern struct smack_known smack_known_floor;
@@ -312,7 +313,7 @@ static inline int smack_privileged(int cap)
 
 	if (!capable(cap))
 		return 0;
-	if (smack_onlycap == NULL || smack_onlycap == skp->smk_known)
+	if (smack_onlycap == NULL || smack_onlycap == skp)
 		return 1;
 	return 0;
 }

security/smack/smack_lsm.c

@@ -219,8 +219,6 @@ static int smack_ptrace_traceme(struct task_struct *ptp)
  * smack_syslog - Smack approval on syslog
  * @type: message type
  *
- * Require that the task has the floor label
- *
  * Returns 0 on success, error code otherwise.
  */
 static int smack_syslog(int typefrom_file)
@@ -231,7 +229,7 @@ static int smack_syslog(int typefrom_file)
 	if (smack_privileged(CAP_MAC_OVERRIDE))
 		return 0;
 
-	 if (skp != &smack_known_floor)
+	if (smack_syslog_label != NULL && smack_syslog_label != skp)
 		rc = -EACCES;
 
 	return rc;
@@ -341,10 +339,12 @@ static int smack_sb_kern_mount(struct super_block *sb, int flags, void *data)
 	struct inode *inode = root->d_inode;
 	struct superblock_smack *sp = sb->s_security;
 	struct inode_smack *isp;
+	struct smack_known *skp;
 	char *op;
 	char *commap;
 	char *nsp;
 	int transmute = 0;
+	int specified = 0;
 
 	if (sp->smk_initialized)
 		return 0;
@@ -359,34 +359,56 @@ static int smack_sb_kern_mount(struct super_block *sb, int flags, void *data)
 		if (strncmp(op, SMK_FSHAT, strlen(SMK_FSHAT)) == 0) {
 			op += strlen(SMK_FSHAT);
 			nsp = smk_import(op, 0);
-			if (nsp != NULL)
+			if (nsp != NULL) {
 				sp->smk_hat = nsp;
+				specified = 1;
+			}
 		} else if (strncmp(op, SMK_FSFLOOR, strlen(SMK_FSFLOOR)) == 0) {
 			op += strlen(SMK_FSFLOOR);
 			nsp = smk_import(op, 0);
-			if (nsp != NULL)
+			if (nsp != NULL) {
 				sp->smk_floor = nsp;
+				specified = 1;
+			}
 		} else if (strncmp(op, SMK_FSDEFAULT,
 				   strlen(SMK_FSDEFAULT)) == 0) {
 			op += strlen(SMK_FSDEFAULT);
 			nsp = smk_import(op, 0);
-			if (nsp != NULL)
+			if (nsp != NULL) {
 				sp->smk_default = nsp;
+				specified = 1;
+			}
 		} else if (strncmp(op, SMK_FSROOT, strlen(SMK_FSROOT)) == 0) {
 			op += strlen(SMK_FSROOT);
 			nsp = smk_import(op, 0);
-			if (nsp != NULL)
+			if (nsp != NULL) {
 				sp->smk_root = nsp;
+				specified = 1;
+			}
 		} else if (strncmp(op, SMK_FSTRANS, strlen(SMK_FSTRANS)) == 0) {
 			op += strlen(SMK_FSTRANS);
 			nsp = smk_import(op, 0);
 			if (nsp != NULL) {
 				sp->smk_root = nsp;
 				transmute = 1;
+				specified = 1;
 			}
 		}
 	}
 
+	if (!smack_privileged(CAP_MAC_ADMIN)) {
+		/*
+		 * Unprivileged mounts don't get to specify Smack values.
+		 */
+		if (specified)
+			return -EPERM;
+		/*
+		 * Unprivileged mounts get root and default from the caller.
+		 */
+		skp = smk_of_current();
+		sp->smk_root = skp->smk_known;
+		sp->smk_default = skp->smk_known;
+	}
 	/*
 	 * Initialize the root inode.
 	 */
@@ -423,53 +445,6 @@ static int smack_sb_statfs(struct dentry *dentry)
 	return rc;
 }
 
-/**
- * smack_sb_mount - Smack check for mounting
- * @dev_name: unused
- * @path: mount point
- * @type: unused
- * @flags: unused
- * @data: unused
- *
- * Returns 0 if current can write the floor of the filesystem
- * being mounted on, an error code otherwise.
- */
-static int smack_sb_mount(const char *dev_name, struct path *path,
-			  const char *type, unsigned long flags, void *data)
-{
-	struct superblock_smack *sbp = path->dentry->d_sb->s_security;
-	struct smk_audit_info ad;
-
-	smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
-	smk_ad_setfield_u_fs_path(&ad, *path);
-
-	return smk_curacc(sbp->smk_floor, MAY_WRITE, &ad);
-}
-
-/**
- * smack_sb_umount - Smack check for unmounting
- * @mnt: file system to unmount
- * @flags: unused
- *
- * Returns 0 if current can write the floor of the filesystem
- * being unmounted, an error code otherwise.
- */
-static int smack_sb_umount(struct vfsmount *mnt, int flags)
-{
-	struct superblock_smack *sbp;
-	struct smk_audit_info ad;
-	struct path path;
-
-	path.dentry = mnt->mnt_root;
-	path.mnt = mnt;
-
-	smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
-	smk_ad_setfield_u_fs_path(&ad, path);
-
-	sbp = path.dentry->d_sb->s_security;
-	return smk_curacc(sbp->smk_floor, MAY_WRITE, &ad);
-}
-
 /*
  * BPRM hooks
  */
@@ -837,31 +812,43 @@ static int smack_inode_setxattr(struct dentry *dentry, const char *name,
 				const void *value, size_t size, int flags)
 {
 	struct smk_audit_info ad;
+	struct smack_known *skp;
+	int check_priv = 0;
+	int check_import = 0;
+	int check_star = 0;
 	int rc = 0;
 
+	/*
+	 * Check label validity here so import won't fail in post_setxattr
+	 */
 	if (strcmp(name, XATTR_NAME_SMACK) == 0 ||
 	    strcmp(name, XATTR_NAME_SMACKIPIN) == 0 ||
-	    strcmp(name, XATTR_NAME_SMACKIPOUT) == 0 ||
-	    strcmp(name, XATTR_NAME_SMACKEXEC) == 0 ||
-	    strcmp(name, XATTR_NAME_SMACKMMAP) == 0) {
-		if (!smack_privileged(CAP_MAC_ADMIN))
-			rc = -EPERM;
-		/*
-		 * check label validity here so import wont fail on
-		 * post_setxattr
-		 */
-		if (size == 0 || size >= SMK_LONGLABEL ||
-		    smk_import(value, size) == NULL)
-			rc = -EINVAL;
+	    strcmp(name, XATTR_NAME_SMACKIPOUT) == 0) {
+		check_priv = 1;
+		check_import = 1;
+	} else if (strcmp(name, XATTR_NAME_SMACKEXEC) == 0 ||
+		   strcmp(name, XATTR_NAME_SMACKMMAP) == 0) {
+		check_priv = 1;
+		check_import = 1;
+		check_star = 1;
 	} else if (strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0) {
-		if (!smack_privileged(CAP_MAC_ADMIN))
-			rc = -EPERM;
+		check_priv = 1;
 		if (size != TRANS_TRUE_SIZE ||
 		    strncmp(value, TRANS_TRUE, TRANS_TRUE_SIZE) != 0)
 			rc = -EINVAL;
 	} else
 		rc = cap_inode_setxattr(dentry, name, value, size, flags);
 
+	if (check_priv && !smack_privileged(CAP_MAC_ADMIN))
+		rc = -EPERM;
+
+	if (rc == 0 && check_import) {
+		skp = smk_import_entry(value, size);
+		if (skp == NULL || (check_star &&
+		    (skp == &smack_known_star || skp == &smack_known_web)))
+			rc = -EINVAL;
+	}
+
 	smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
 	smk_ad_setfield_u_fs_path_dentry(&ad, dentry);
 
@@ -1364,7 +1351,7 @@ static int smack_file_receive(struct file *file)
 	int may = 0;
 	struct smk_audit_info ad;
 
-	smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK);
+	smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
 	smk_ad_setfield_u_fs_path(&ad, file->f_path);
 	/*
 	 * This code relies on bitmasks.
@@ -2847,8 +2834,17 @@ static void smack_d_instantiate(struct dentry *opt_dentry, struct inode *inode)
 			if (rc >= 0)
 				transflag = SMK_INODE_TRANSMUTE;
 		}
-		isp->smk_task = smk_fetch(XATTR_NAME_SMACKEXEC, inode, dp);
-		isp->smk_mmap = smk_fetch(XATTR_NAME_SMACKMMAP, inode, dp);
+		/*
+		 * Don't let the exec or mmap label be "*" or "@".
+		 */
+		skp = smk_fetch(XATTR_NAME_SMACKEXEC, inode, dp);
+		if (skp == &smack_known_star || skp == &smack_known_web)
+			skp = NULL;
+		isp->smk_task = skp;
+		skp = smk_fetch(XATTR_NAME_SMACKMMAP, inode, dp);
+		if (skp == &smack_known_star || skp == &smack_known_web)
+			skp = NULL;
+		isp->smk_mmap = skp;
 
 		dput(dp);
 		break;
@@ -3743,8 +3739,6 @@ struct security_operations smack_ops = {
 	.sb_copy_data = 		smack_sb_copy_data,
 	.sb_kern_mount = 		smack_sb_kern_mount,
 	.sb_statfs = 			smack_sb_statfs,
-	.sb_mount = 			smack_sb_mount,
-	.sb_umount = 			smack_sb_umount,
 
 	.bprm_set_creds =		smack_bprm_set_creds,
 	.bprm_committing_creds =	smack_bprm_committing_creds,

security/smack/smackfs.c

@@ -52,6 +52,7 @@ enum smk_inos {
 	SMK_CIPSO2	= 17,	/* load long label -> CIPSO mapping */
 	SMK_REVOKE_SUBJ	= 18,	/* set rules with subject label to '-' */
 	SMK_CHANGE_RULE	= 19,	/* change or add rules (long labels) */
+	SMK_SYSLOG	= 20,	/* change syslog label) */
 };
 
 /*
@@ -59,6 +60,7 @@ enum smk_inos {
  */
 static DEFINE_MUTEX(smack_cipso_lock);
 static DEFINE_MUTEX(smack_ambient_lock);
+static DEFINE_MUTEX(smack_syslog_lock);
 static DEFINE_MUTEX(smk_netlbladdr_lock);
 
 /*
@@ -90,7 +92,13 @@ int smack_cipso_mapped = SMACK_CIPSO_MAPPED_DEFAULT;
  * everyone. It is expected that the hat (^) label
  * will be used if any label is used.
  */
-char *smack_onlycap;
+struct smack_known *smack_onlycap;
+
+/*
+ * If this value is set restrict syslog use to the label specified.
+ * It can be reset via smackfs/syslog
+ */
+struct smack_known *smack_syslog_label;
 
 /*
  * Certain IP addresses may be designated as single label hosts.
@@ -301,7 +309,8 @@ static int smk_perm_from_str(const char *string)
  * @import: if non-zero, import labels
  * @len: label length limit
  *
- * Returns 0 on success, -1 on failure
+ * Returns 0 on success, -EINVAL on failure and -ENOENT when either subject
+ * or object is missing.
  */
 static int smk_fill_rule(const char *subject, const char *object,
 				const char *access1, const char *access2,
@@ -314,28 +323,28 @@ static int smk_fill_rule(const char *subject, const char *object,
 	if (import) {
 		rule->smk_subject = smk_import_entry(subject, len);
 		if (rule->smk_subject == NULL)
-			return -1;
+			return -EINVAL;
 
 		rule->smk_object = smk_import(object, len);
 		if (rule->smk_object == NULL)
-			return -1;
+			return -EINVAL;
 	} else {
 		cp = smk_parse_smack(subject, len);
 		if (cp == NULL)
-			return -1;
+			return -EINVAL;
 		skp = smk_find_entry(cp);
 		kfree(cp);
 		if (skp == NULL)
-			return -1;
+			return -ENOENT;
 		rule->smk_subject = skp;
 
 		cp = smk_parse_smack(object, len);
 		if (cp == NULL)
-			return -1;
+			return -EINVAL;
 		skp = smk_find_entry(cp);
 		kfree(cp);
 		if (skp == NULL)
-			return -1;
+			return -ENOENT;
 		rule->smk_object = skp->smk_known;
 	}
 
@@ -381,6 +390,7 @@ static ssize_t smk_parse_long_rule(char *data, struct smack_parsed_rule *rule,
 {
 	ssize_t cnt = 0;
 	char *tok[4];
+	int rc;
 	int i;
 
 	/*
@@ -405,10 +415,8 @@ static ssize_t smk_parse_long_rule(char *data, struct smack_parsed_rule *rule,
 	while (i < 4)
 		tok[i++] = NULL;
 
-	if (smk_fill_rule(tok[0], tok[1], tok[2], tok[3], rule, import, 0))
-		return -1;
-
-	return cnt;
+	rc = smk_fill_rule(tok[0], tok[1], tok[2], tok[3], rule, import, 0);
+	return rc == 0 ? cnt : rc;
 }
 
 #define SMK_FIXED24_FMT	0	/* Fixed 24byte label format */
@@ -1603,7 +1611,7 @@ static const struct file_operations smk_ambient_ops = {
 };
 
 /**
- * smk_read_onlycap - read() for /smack/onlycap
+ * smk_read_onlycap - read() for smackfs/onlycap
  * @filp: file pointer, not actually used
  * @buf: where to put the result
  * @cn: maximum to send along
@@ -1622,7 +1630,7 @@ static ssize_t smk_read_onlycap(struct file *filp, char __user *buf,
 		return 0;
 
 	if (smack_onlycap != NULL)
-		smack = smack_onlycap;
+		smack = smack_onlycap->smk_known;
 
 	asize = strlen(smack) + 1;
 
@@ -1633,7 +1641,7 @@ static ssize_t smk_read_onlycap(struct file *filp, char __user *buf,
 }
 
 /**
- * smk_write_onlycap - write() for /smack/onlycap
+ * smk_write_onlycap - write() for smackfs/onlycap
  * @file: file pointer, not actually used
  * @buf: where to get the data from
  * @count: bytes sent
@@ -1656,7 +1664,7 @@ static ssize_t smk_write_onlycap(struct file *file, const char __user *buf,
 	 * explicitly for clarity. The smk_access() implementation
 	 * would use smk_access(smack_onlycap, MAY_WRITE)
 	 */
-	if (smack_onlycap != NULL && smack_onlycap != skp->smk_known)
+	if (smack_onlycap != NULL && smack_onlycap != skp)
 		return -EPERM;
 
 	data = kzalloc(count, GFP_KERNEL);
@@ -1676,7 +1684,7 @@ static ssize_t smk_write_onlycap(struct file *file, const char __user *buf,
 	if (copy_from_user(data, buf, count) != 0)
 		rc = -EFAULT;
 	else
-		smack_onlycap = smk_import(data, count);
+		smack_onlycap = smk_import_entry(data, count);
 
 	kfree(data);
 	return rc;
@@ -1856,11 +1864,12 @@ static ssize_t smk_user_access(struct file *file, const char __user *buf,
 		res = smk_parse_long_rule(data, &rule, 0, 3);
 	}
 
-	if (res < 0)
+	if (res >= 0)
+		res = smk_access(rule.smk_subject, rule.smk_object,
+				 rule.smk_access1, NULL);
+	else if (res != -ENOENT)
 		return -EINVAL;
 
-	res = smk_access(rule.smk_subject, rule.smk_object,
-				rule.smk_access1, NULL);
 	data[0] = res == 0 ? '1' : '0';
 	data[1] = '\0';
 
@@ -2143,7 +2152,7 @@ static ssize_t smk_write_change_rule(struct file *file, const char __user *buf,
 	/*
 	 * Must have privilege.
 	 */
-	if (!capable(CAP_MAC_ADMIN))
+	if (!smack_privileged(CAP_MAC_ADMIN))
 		return -EPERM;
 
 	return smk_write_rules_list(file, buf, count, ppos, NULL, NULL,
@@ -2158,12 +2167,89 @@ static const struct file_operations smk_change_rule_ops = {
 };
 
 /**
- * smk_fill_super - fill the /smackfs superblock
+ * smk_read_syslog - read() for smackfs/syslog
+ * @filp: file pointer, not actually used
+ * @buf: where to put the result
+ * @cn: maximum to send along
+ * @ppos: where to start
+ *
+ * Returns number of bytes read or error code, as appropriate
+ */
+static ssize_t smk_read_syslog(struct file *filp, char __user *buf,
+				size_t cn, loff_t *ppos)
+{
+	struct smack_known *skp;
+	ssize_t rc = -EINVAL;
+	int asize;
+
+	if (*ppos != 0)
+		return 0;
+
+	if (smack_syslog_label == NULL)
+		skp = &smack_known_star;
+	else
+		skp = smack_syslog_label;
+
+	asize = strlen(skp->smk_known) + 1;
+
+	if (cn >= asize)
+		rc = simple_read_from_buffer(buf, cn, ppos, skp->smk_known,
+						asize);
+
+	return rc;
+}
+
+/**
+ * smk_write_syslog - write() for smackfs/syslog
+ * @file: file pointer, not actually used
+ * @buf: where to get the data from
+ * @count: bytes sent
+ * @ppos: where to start
+ *
+ * Returns number of bytes written or error code, as appropriate
+ */
+static ssize_t smk_write_syslog(struct file *file, const char __user *buf,
+				size_t count, loff_t *ppos)
+{
+	char *data;
+	struct smack_known *skp;
+	int rc = count;
+
+	if (!smack_privileged(CAP_MAC_ADMIN))
+		return -EPERM;
+
+	data = kzalloc(count, GFP_KERNEL);
+	if (data == NULL)
+		return -ENOMEM;
+
+	if (copy_from_user(data, buf, count) != 0)
+		rc = -EFAULT;
+	else {
+		skp = smk_import_entry(data, count);
+		if (skp == NULL)
+			rc = -EINVAL;
+		else
+			smack_syslog_label = smk_import_entry(data, count);
+	}
+
+	kfree(data);
+	return rc;
+}
+
+static const struct file_operations smk_syslog_ops = {
+	.read		= smk_read_syslog,
+	.write		= smk_write_syslog,
+	.llseek		= default_llseek,
+};
+
+
+/**
+ * smk_fill_super - fill the smackfs superblock
  * @sb: the empty superblock
  * @data: unused
  * @silent: unused
  *
- * Fill in the well known entries for /smack
+ * Fill in the well known entries for the smack filesystem
  *
  * Returns 0 on success, an error code on failure
  */
@@ -2208,6 +2294,8 @@ static int smk_fill_super(struct super_block *sb, void *data, int silent)
 			S_IRUGO|S_IWUSR},
 		[SMK_CHANGE_RULE] = {
 			"change-rule", &smk_change_rule_ops, S_IRUGO|S_IWUSR},
+		[SMK_SYSLOG] = {
+			"syslog", &smk_syslog_ops, S_IRUGO|S_IWUSR},
 		/* last one */
 			{""}
 	};