Merge tag 'selinux-pr-20240513' of git://git.kernel.org/pub/scm/linux/kernel/git/pcmoore/selinux

Pull selinux updates from Paul Moore:

 - Attempt to pre-allocate the SELinux status page so it doesn't appear
   to userspace that we are skipping SELinux policy sequence numbers

 - Reject invalid SELinux policy bitmaps with an error at policy load
   time

 - Consistently use the same type, u32, for ebitmap offsets

 - Improve the "symhash" hash function for better distribution on common
   policies

 - Correct a number of printk format specifiers in the ebitmap code

 - Improved error checking in sel_write_load()

 - Ensure we have a proper return code in the
   filename_trans_read_helper_compat() function

 - Make better use of the current_sid() helper function

 - Allow for more hash table statistics when debugging is enabled

 - Migrate from printk_ratelimit() to pr_warn_ratelimited()

 - Miscellaneous cleanups and tweaks to selinux_lsm_getattr()

 - More consitification work in the conditional policy space

* tag 'selinux-pr-20240513' of git://git.kernel.org/pub/scm/linux/kernel/git/pcmoore/selinux:
  selinux: constify source policy in cond_policydb_dup()
  selinux: avoid printk_ratelimit()
  selinux: pre-allocate the status page
  selinux: clarify return code in filename_trans_read_helper_compat()
  selinux: use u32 as bit position type in ebitmap code
  selinux: improve symtab string hashing
  selinux: dump statistics for more hash tables
  selinux: make more use of current_sid()
  selinux: update numeric format specifiers for ebitmaps
  selinux: improve error checking in sel_write_load()
  selinux: cleanup selinux_lsm_getattr()
  selinux: reject invalid ebitmaps

Author: torvalds

security/selinux/hooks.c

@@ -2961,7 +2961,7 @@ static int selinux_inode_init_security_anon(struct inode *inode,
 					    const struct qstr *name,
 					    const struct inode *context_inode)
 {
-	const struct task_security_struct *tsec = selinux_cred(current_cred());
+	u32 sid = current_sid();
 	struct common_audit_data ad;
 	struct inode_security_struct *isec;
 	int rc;
@@ -2990,7 +2990,7 @@ static int selinux_inode_init_security_anon(struct inode *inode,
 	} else {
 		isec->sclass = SECCLASS_ANON_INODE;
 		rc = security_transition_sid(
-			tsec->sid, tsec->sid,
+			sid, sid,
 			isec->sclass, name, &isec->sid);
 		if (rc)
 			return rc;
@@ -3005,7 +3005,7 @@ static int selinux_inode_init_security_anon(struct inode *inode,
 	ad.type = LSM_AUDIT_DATA_ANONINODE;
 	ad.u.anonclass = name ? (const char *)name->name : "?";
 
-	return avc_has_perm(tsec->sid,
+	return avc_has_perm(sid,
 			    isec->sid,
 			    isec->sclass,
 			    FILE__CREATE,
@@ -3063,14 +3063,12 @@ static int selinux_inode_readlink(struct dentry *dentry)
 static int selinux_inode_follow_link(struct dentry *dentry, struct inode *inode,
 				     bool rcu)
 {
-	const struct cred *cred = current_cred();
 	struct common_audit_data ad;
 	struct inode_security_struct *isec;
-	u32 sid;
+	u32 sid = current_sid();
 
 	ad.type = LSM_AUDIT_DATA_DENTRY;
 	ad.u.dentry = dentry;
-	sid = cred_sid(cred);
 	isec = inode_security_rcu(inode, rcu);
 	if (IS_ERR(isec))
 		return PTR_ERR(isec);
@@ -3094,12 +3092,11 @@ static noinline int audit_inode_permission(struct inode *inode,
 
 static int selinux_inode_permission(struct inode *inode, int mask)
 {
-	const struct cred *cred = current_cred();
 	u32 perms;
 	bool from_access;
 	bool no_block = mask & MAY_NOT_BLOCK;
 	struct inode_security_struct *isec;
-	u32 sid;
+	u32 sid = current_sid();
 	struct av_decision avd;
 	int rc, rc2;
 	u32 audited, denied;
@@ -3116,7 +3113,6 @@ static int selinux_inode_permission(struct inode *inode, int mask)
 
 	perms = file_mask_to_av(inode->i_mode, mask);
 
-	sid = cred_sid(cred);
 	isec = inode_security_rcu(inode, no_block);
 	if (IS_ERR(isec))
 		return PTR_ERR(isec);
@@ -5564,13 +5560,7 @@ static void selinux_inet_conn_established(struct sock *sk, struct sk_buff *skb)
 
 static int selinux_secmark_relabel_packet(u32 sid)
 {
-	const struct task_security_struct *tsec;
-	u32 tsid;
-
-	tsec = selinux_cred(current_cred());
-	tsid = tsec->sid;
-
-	return avc_has_perm(tsid, sid, SECCLASS_PACKET, PACKET__RELABELTO,
+	return avc_has_perm(current_sid(), sid, SECCLASS_PACKET, PACKET__RELABELTO,
 			    NULL);
 }
 
@@ -6348,55 +6338,55 @@ static void selinux_d_instantiate(struct dentry *dentry, struct inode *inode)
 static int selinux_lsm_getattr(unsigned int attr, struct task_struct *p,
 			       char **value)
 {
-	const struct task_security_struct *__tsec;
-	u32 sid;
+	const struct task_security_struct *tsec;
 	int error;
-	unsigned len;
+	u32 sid;
+	u32 len;
 
 	rcu_read_lock();
-	__tsec = selinux_cred(__task_cred(p));
-
-	if (current != p) {
-		error = avc_has_perm(current_sid(), __tsec->sid,
+	tsec = selinux_cred(__task_cred(p));
+	if (p != current) {
+		error = avc_has_perm(current_sid(), tsec->sid,
 				     SECCLASS_PROCESS, PROCESS__GETATTR, NULL);
 		if (error)
-			goto bad;
+			goto err_unlock;
 	}
-
 	switch (attr) {
 	case LSM_ATTR_CURRENT:
-		sid = __tsec->sid;
+		sid = tsec->sid;
 		break;
 	case LSM_ATTR_PREV:
-		sid = __tsec->osid;
+		sid = tsec->osid;
 		break;
 	case LSM_ATTR_EXEC:
-		sid = __tsec->exec_sid;
+		sid = tsec->exec_sid;
 		break;
 	case LSM_ATTR_FSCREATE:
-		sid = __tsec->create_sid;
+		sid = tsec->create_sid;
 		break;
 	case LSM_ATTR_KEYCREATE:
-		sid = __tsec->keycreate_sid;
+		sid = tsec->keycreate_sid;
 		break;
 	case LSM_ATTR_SOCKCREATE:
-		sid = __tsec->sockcreate_sid;
+		sid = tsec->sockcreate_sid;
 		break;
 	default:
 		error = -EOPNOTSUPP;
-		goto bad;
+		goto err_unlock;
 	}
 	rcu_read_unlock();
 
-	if (!sid)
+	if (sid == SECSID_NULL) {
+		*value = NULL;
 		return 0;
+	}
 
 	error = security_sid_to_context(sid, value, &len);
 	if (error)
 		return error;
 	return len;
 
-bad:
+err_unlock:
 	rcu_read_unlock();
 	return error;
 }

security/selinux/selinuxfs.c

@@ -571,38 +571,41 @@ static ssize_t sel_write_load(struct file *file, const char __user *buf,
 			      size_t count, loff_t *ppos)
 
 {
-	struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
+	struct selinux_fs_info *fsi;
 	struct selinux_load_state load_state;
 	ssize_t length;
 	void *data = NULL;
 
+	/* no partial writes */
+	if (*ppos)
+		return -EINVAL;
+	/* no empty policies */
+	if (!count)
+		return -EINVAL;
+
 	mutex_lock(&selinux_state.policy_mutex);
 
 	length = avc_has_perm(current_sid(), SECINITSID_SECURITY,
 			      SECCLASS_SECURITY, SECURITY__LOAD_POLICY, NULL);
 	if (length)
 		goto out;
 
-	/* No partial writes. */
-	length = -EINVAL;
-	if (*ppos != 0)
-		goto out;
-
-	length = -ENOMEM;
 	data = vmalloc(count);
-	if (!data)
+	if (!data) {
+		length = -ENOMEM;
 		goto out;
-
-	length = -EFAULT;
-	if (copy_from_user(data, buf, count) != 0)
+	}
+	if (copy_from_user(data, buf, count) != 0) {
+		length = -EFAULT;
 		goto out;
+	}
 
 	length = security_load_policy(data, count, &load_state);
 	if (length) {
 		pr_warn_ratelimited("SELinux: failed to load policy\n");
 		goto out;
 	}
-
+	fsi = file_inode(file)->i_sb->s_fs_info;
 	length = sel_make_policy_nodes(fsi, load_state.policy);
 	if (length) {
 		pr_warn_ratelimited("SELinux: failed to initialize selinuxfs\n");
@@ -611,13 +614,12 @@ static ssize_t sel_write_load(struct file *file, const char __user *buf,
 	}
 
 	selinux_policy_commit(&load_state);
-
 	length = count;
-
 	audit_log(audit_context(), GFP_KERNEL, AUDIT_MAC_POLICY_LOAD,
 		"auid=%u ses=%u lsm=selinux res=1",
 		from_kuid(&init_user_ns, audit_get_loginuid(current)),
 		audit_get_sessionid(current));
+
 out:
 	mutex_unlock(&selinux_state.policy_mutex);
 	vfree(data);
@@ -2161,6 +2163,12 @@ static int __init init_sel_fs(void)
 		return err;
 	}
 
+	/*
+	 * Try to pre-allocate the status page, so the sequence number of the
+	 * initial policy load can be stored.
+	 */
+	(void) selinux_kernel_status_page();
+
 	return err;
 }
 

security/selinux/ss/conditional.c

@@ -169,6 +169,9 @@ int cond_init_bool_indexes(struct policydb *p)
 		p->p_bools.nprim, sizeof(*p->bool_val_to_struct), GFP_KERNEL);
 	if (!p->bool_val_to_struct)
 		return -ENOMEM;
+
+	avtab_hash_eval(&p->te_cond_avtab, "conditional_rules");
+
 	return 0;
 }
 
@@ -600,7 +603,8 @@ void cond_compute_av(struct avtab *ctab, struct avtab_key *key,
 	}
 }
 
-static int cond_dup_av_list(struct cond_av_list *new, struct cond_av_list *orig,
+static int cond_dup_av_list(struct cond_av_list *new,
+			    const struct cond_av_list *orig,
 			    struct avtab *avtab)
 {
 	u32 i;
@@ -623,7 +627,7 @@ static int cond_dup_av_list(struct cond_av_list *new, struct cond_av_list *orig,
 }
 
 static int duplicate_policydb_cond_list(struct policydb *newp,
-					struct policydb *origp)
+					const struct policydb *origp)
 {
 	int rc;
 	u32 i;
@@ -640,7 +644,7 @@ static int duplicate_policydb_cond_list(struct policydb *newp,
 
 	for (i = 0; i < origp->cond_list_len; i++) {
 		struct cond_node *newn = &newp->cond_list[i];
-		struct cond_node *orign = &origp->cond_list[i];
+		const struct cond_node *orign = &origp->cond_list[i];
 
 		newp->cond_list_len++;
 
@@ -680,8 +684,8 @@ static int cond_bools_destroy(void *key, void *datum, void *args)
 	return 0;
 }
 
-static int cond_bools_copy(struct hashtab_node *new, struct hashtab_node *orig,
-			   void *args)
+static int cond_bools_copy(struct hashtab_node *new,
+			   const struct hashtab_node *orig, void *args)
 {
 	struct cond_bool_datum *datum;
 
@@ -707,7 +711,7 @@ static int cond_bools_index(void *key, void *datum, void *args)
 }
 
 static int duplicate_policydb_bools(struct policydb *newdb,
-				    struct policydb *orig)
+				    const struct policydb *orig)
 {
 	struct cond_bool_datum **cond_bool_array;
 	int rc;
@@ -740,7 +744,7 @@ void cond_policydb_destroy_dup(struct policydb *p)
 	cond_policydb_destroy(p);
 }
 
-int cond_policydb_dup(struct policydb *new, struct policydb *orig)
+int cond_policydb_dup(struct policydb *new, const struct policydb *orig)
 {
 	cond_policydb_init(new);
 

security/selinux/ss/conditional.h

@@ -79,6 +79,6 @@ void cond_compute_xperms(struct avtab *ctab, struct avtab_key *key,
 			 struct extended_perms_decision *xpermd);
 void evaluate_cond_nodes(struct policydb *p);
 void cond_policydb_destroy_dup(struct policydb *p);
-int cond_policydb_dup(struct policydb *new, struct policydb *orig);
+int cond_policydb_dup(struct policydb *new, const struct policydb *orig);
 
 #endif /* _CONDITIONAL_H_ */