Merge tag 'selinux-pr-20210629' of git://git.kernel.org/pub/scm/linux/kernel/git/pcmoore/selinux

Pull SELinux updates from Paul Moore:

 - The slow_avc_audit() function is now non-blocking so we can remove
   the AVC_NONBLOCKING tricks; this also includes the 'flags' variant of
   avc_has_perm().

 - Use kmemdup() instead of kcalloc()+copy when copying parts of the
   SELinux policydb.

 - The InfiniBand device name is now passed by reference when possible
   in the SELinux code, removing a strncpy().

 - Minor cleanups including: constification of avtab function args,
   removal of useless LSM/XFRM function args, SELinux kdoc fixes, and
   removal of redundant assignments.

* tag 'selinux-pr-20210629' of git://git.kernel.org/pub/scm/linux/kernel/git/pcmoore/selinux:
  selinux: kill 'flags' argument in avc_has_perm_flags() and avc_audit()
  selinux: slow_avc_audit has become non-blocking
  selinux: Fix kernel-doc
  selinux: use __GFP_NOWARN with GFP_NOWAIT in the AVC
  lsm_audit,selinux: pass IB device name by reference
  selinux: Remove redundant assignment to rc
  selinux: Corrected comment to match kernel-doc comment
  selinux: delete selinux_xfrm_policy_lookup() useless argument
  selinux: constify some avtab function arguments
  selinux: simplify duplicate_policydb_cond_list() by using kmemdup()

include/linux/lsm_audit.h

@@ -48,13 +48,13 @@ struct lsm_ioctlop_audit {
 };
 
 struct lsm_ibpkey_audit {
-	u64	subnet_prefix;
-	u16	pkey;
+	u64 subnet_prefix;
+	u16 pkey;
 };
 
 struct lsm_ibendport_audit {
-	char	dev_name[IB_DEVICE_NAME_MAX];
-	u8	port;
+	const char *dev_name;
+	u8 port;
 };
 
 /* Auxiliary data to use in generating the audit record. */

include/linux/lsm_hook_defs.h

@@ -358,8 +358,7 @@ LSM_HOOK(int, 0, xfrm_state_alloc_acquire, struct xfrm_state *x,
 	 struct xfrm_sec_ctx *polsec, u32 secid)
 LSM_HOOK(void, LSM_RET_VOID, xfrm_state_free_security, struct xfrm_state *x)
 LSM_HOOK(int, 0, xfrm_state_delete_security, struct xfrm_state *x)
-LSM_HOOK(int, 0, xfrm_policy_lookup, struct xfrm_sec_ctx *ctx, u32 fl_secid,
-	 u8 dir)
+LSM_HOOK(int, 0, xfrm_policy_lookup, struct xfrm_sec_ctx *ctx, u32 fl_secid)
 LSM_HOOK(int, 1, xfrm_state_pol_flow_match, struct xfrm_state *x,
 	 struct xfrm_policy *xp, const struct flowi_common *flic)
 LSM_HOOK(int, 0, xfrm_decode_session, struct sk_buff *skb, u32 *secid,

include/linux/security.h

@@ -1681,7 +1681,7 @@ int security_xfrm_state_alloc_acquire(struct xfrm_state *x,
 				      struct xfrm_sec_ctx *polsec, u32 secid);
 int security_xfrm_state_delete(struct xfrm_state *x);
 void security_xfrm_state_free(struct xfrm_state *x);
-int security_xfrm_policy_lookup(struct xfrm_sec_ctx *ctx, u32 fl_secid, u8 dir);
+int security_xfrm_policy_lookup(struct xfrm_sec_ctx *ctx, u32 fl_secid);
 int security_xfrm_state_pol_flow_match(struct xfrm_state *x,
 				       struct xfrm_policy *xp,
 				       const struct flowi_common *flic);
@@ -1732,7 +1732,7 @@ static inline int security_xfrm_state_delete(struct xfrm_state *x)
 	return 0;
 }
 
-static inline int security_xfrm_policy_lookup(struct xfrm_sec_ctx *ctx, u32 fl_secid, u8 dir)
+static inline int security_xfrm_policy_lookup(struct xfrm_sec_ctx *ctx, u32 fl_secid)
 {
 	return 0;
 }

net/xfrm/xfrm_policy.c

@@ -1902,8 +1902,7 @@ static int xfrm_policy_match(const struct xfrm_policy *pol,
 
 	match = xfrm_selector_match(sel, fl, family);
 	if (match)
-		ret = security_xfrm_policy_lookup(pol->security, fl->flowi_secid,
-						  dir);
+		ret = security_xfrm_policy_lookup(pol->security, fl->flowi_secid);
 	return ret;
 }
 
@@ -2181,8 +2180,7 @@ static struct xfrm_policy *xfrm_sk_policy_lookup(const struct sock *sk, int dir,
 				goto out;
 			}
 			err = security_xfrm_policy_lookup(pol->security,
-						      fl->flowi_secid,
-						      dir);
+						      fl->flowi_secid);
 			if (!err) {
 				if (!xfrm_pol_hold_rcu(pol))
 					goto again;

security/security.c

@@ -2466,9 +2466,9 @@ void security_xfrm_state_free(struct xfrm_state *x)
 	call_void_hook(xfrm_state_free_security, x);
 }
 
-int security_xfrm_policy_lookup(struct xfrm_sec_ctx *ctx, u32 fl_secid, u8 dir)
+int security_xfrm_policy_lookup(struct xfrm_sec_ctx *ctx, u32 fl_secid)
 {
-	return call_int_hook(xfrm_policy_lookup, 0, ctx, fl_secid, dir);
+	return call_int_hook(xfrm_policy_lookup, 0, ctx, fl_secid);
 }
 
 int security_xfrm_state_pol_flow_match(struct xfrm_state *x,

security/selinux/avc.c

@@ -297,26 +297,27 @@ static struct avc_xperms_decision_node
 	struct avc_xperms_decision_node *xpd_node;
 	struct extended_perms_decision *xpd;
 
-	xpd_node = kmem_cache_zalloc(avc_xperms_decision_cachep, GFP_NOWAIT);
+	xpd_node = kmem_cache_zalloc(avc_xperms_decision_cachep,
+				     GFP_NOWAIT | __GFP_NOWARN);
 	if (!xpd_node)
 		return NULL;
 
 	xpd = &xpd_node->xpd;
 	if (which & XPERMS_ALLOWED) {
 		xpd->allowed = kmem_cache_zalloc(avc_xperms_data_cachep,
-						GFP_NOWAIT);
+						GFP_NOWAIT | __GFP_NOWARN);
 		if (!xpd->allowed)
 			goto error;
 	}
 	if (which & XPERMS_AUDITALLOW) {
 		xpd->auditallow = kmem_cache_zalloc(avc_xperms_data_cachep,
-						GFP_NOWAIT);
+						GFP_NOWAIT | __GFP_NOWARN);
 		if (!xpd->auditallow)
 			goto error;
 	}
 	if (which & XPERMS_DONTAUDIT) {
 		xpd->dontaudit = kmem_cache_zalloc(avc_xperms_data_cachep,
-						GFP_NOWAIT);
+						GFP_NOWAIT | __GFP_NOWARN);
 		if (!xpd->dontaudit)
 			goto error;
 	}
@@ -344,7 +345,7 @@ static struct avc_xperms_node *avc_xperms_alloc(void)
 {
 	struct avc_xperms_node *xp_node;
 
-	xp_node = kmem_cache_zalloc(avc_xperms_cachep, GFP_NOWAIT);
+	xp_node = kmem_cache_zalloc(avc_xperms_cachep, GFP_NOWAIT | __GFP_NOWARN);
 	if (!xp_node)
 		return xp_node;
 	INIT_LIST_HEAD(&xp_node->xpd_head);
@@ -500,7 +501,7 @@ static struct avc_node *avc_alloc_node(struct selinux_avc *avc)
 {
 	struct avc_node *node;
 
-	node = kmem_cache_zalloc(avc_node_cachep, GFP_NOWAIT);
+	node = kmem_cache_zalloc(avc_node_cachep, GFP_NOWAIT | __GFP_NOWARN);
 	if (!node)
 		goto out;
 
@@ -758,7 +759,11 @@ static void avc_audit_post_callback(struct audit_buffer *ab, void *a)
 	}
 }
 
-/* This is the slow part of avc audit with big stack footprint */
+/*
+ * This is the slow part of avc audit with big stack footprint.
+ * Note that it is non-blocking and can be called from under
+ * rcu_read_lock().
+ */
 noinline int slow_avc_audit(struct selinux_state *state,
 			    u32 ssid, u32 tsid, u16 tclass,
 			    u32 requested, u32 audited, u32 denied, int result,
@@ -819,13 +824,13 @@ int __init avc_add_callback(int (*callback)(u32 event), u32 events)
 }
 
 /**
- * avc_update_node Update an AVC entry
+ * avc_update_node - Update an AVC entry
  * @event : Updating event
  * @perms : Permission mask bits
  * @ssid,@tsid,@tclass : identifier of an AVC entry
  * @seqno : sequence number when decision was made
  * @xpd: extended_perms_decision to be added to the node
- * @flags: the AVC_* flags, e.g. AVC_NONBLOCKING, AVC_EXTENDED_PERMS, or 0.
+ * @flags: the AVC_* flags, e.g. AVC_EXTENDED_PERMS, or 0.
  *
  * if a valid AVC entry doesn't exist,this function returns -ENOENT.
  * if kmalloc() called internal returns NULL, this function returns -ENOMEM.
@@ -844,21 +849,6 @@ static int avc_update_node(struct selinux_avc *avc,
 	struct hlist_head *head;
 	spinlock_t *lock;
 
-	/*
-	 * If we are in a non-blocking code path, e.g. VFS RCU walk,
-	 * then we must not add permissions to a cache entry
-	 * because we will not audit the denial.  Otherwise,
-	 * during the subsequent blocking retry (e.g. VFS ref walk), we
-	 * will find the permissions already granted in the cache entry
-	 * and won't audit anything at all, leading to silent denials in
-	 * permissive mode that only appear when in enforcing mode.
-	 *
-	 * See the corresponding handling of MAY_NOT_BLOCK in avc_audit()
-	 * and selinux_inode_permission().
-	 */
-	if (flags & AVC_NONBLOCKING)
-		return 0;
-
 	node = avc_alloc_node(avc);
 	if (!node) {
 		rc = -ENOMEM;
@@ -1119,7 +1109,7 @@ int avc_has_extended_perms(struct selinux_state *state,
  * @tsid: target security identifier
  * @tclass: target security class
  * @requested: requested permissions, interpreted based on @tclass
- * @flags:  AVC_STRICT, AVC_NONBLOCKING, or 0
+ * @flags:  AVC_STRICT or 0
  * @avd: access vector decisions
  *
  * Check the AVC to determine whether the @requested permissions are granted
@@ -1190,26 +1180,7 @@ int avc_has_perm(struct selinux_state *state, u32 ssid, u32 tsid, u16 tclass,
 				  &avd);
 
 	rc2 = avc_audit(state, ssid, tsid, tclass, requested, &avd, rc,
-			auditdata, 0);
-	if (rc2)
-		return rc2;
-	return rc;
-}
-
-int avc_has_perm_flags(struct selinux_state *state,
-		       u32 ssid, u32 tsid, u16 tclass, u32 requested,
-		       struct common_audit_data *auditdata,
-		       int flags)
-{
-	struct av_decision avd;
-	int rc, rc2;
-
-	rc = avc_has_perm_noaudit(state, ssid, tsid, tclass, requested,
-				  (flags & MAY_NOT_BLOCK) ? AVC_NONBLOCKING : 0,
-				  &avd);
-
-	rc2 = avc_audit(state, ssid, tsid, tclass, requested, &avd, rc,
-			auditdata, flags);
+			auditdata);
 	if (rc2)
 		return rc2;
 	return rc;

security/selinux/hooks.c

@@ -1676,7 +1676,7 @@ static int cred_has_capability(const struct cred *cred,
 				  sid, sid, sclass, av, 0, &avd);
 	if (!(opts & CAP_OPT_NOAUDIT)) {
 		int rc2 = avc_audit(&selinux_state,
-				    sid, sid, sclass, av, &avd, rc, &ad, 0);
+				    sid, sid, sclass, av, &avd, rc, &ad);
 		if (rc2)
 			return rc2;
 	}
@@ -3153,9 +3153,8 @@ static int selinux_inode_follow_link(struct dentry *dentry, struct inode *inode,
 	if (IS_ERR(isec))
 		return PTR_ERR(isec);
 
-	return avc_has_perm_flags(&selinux_state,
-				  sid, isec->sid, isec->sclass, FILE__READ, &ad,
-				  rcu ? MAY_NOT_BLOCK : 0);
+	return avc_has_perm(&selinux_state,
+				  sid, isec->sid, isec->sclass, FILE__READ, &ad);
 }
 
 static noinline int audit_inode_permission(struct inode *inode,
@@ -3164,17 +3163,13 @@ static noinline int audit_inode_permission(struct inode *inode,
 {
 	struct common_audit_data ad;
 	struct inode_security_struct *isec = selinux_inode(inode);
-	int rc;
 
 	ad.type = LSM_AUDIT_DATA_INODE;
 	ad.u.inode = inode;
 
-	rc = slow_avc_audit(&selinux_state,
+	return slow_avc_audit(&selinux_state,
 			    current_sid(), isec->sid, isec->sclass, perms,
 			    audited, denied, result, &ad);
-	if (rc)
-		return rc;
-	return 0;
 }
 
 static int selinux_inode_permission(struct inode *inode, int mask)
@@ -3209,8 +3204,7 @@ static int selinux_inode_permission(struct inode *inode, int mask)
 		return PTR_ERR(isec);
 
 	rc = avc_has_perm_noaudit(&selinux_state,
-				  sid, isec->sid, isec->sclass, perms,
-				  no_block ? AVC_NONBLOCKING : 0,
+				  sid, isec->sid, isec->sclass, perms, 0,
 				  &avd);
 	audited = avc_audit_required(perms, &avd, rc,
 				     from_access ? FILE__AUDIT_ACCESS : 0,
@@ -3218,10 +3212,6 @@ static int selinux_inode_permission(struct inode *inode, int mask)
 	if (likely(!audited))
 		return rc;
 
-	/* fall back to ref-walk if we have to generate audit */
-	if (no_block)
-		return -ECHILD;
-
 	rc2 = audit_inode_permission(inode, perms, audited, denied, rc);
 	if (rc2)
 		return rc2;
@@ -6850,7 +6840,7 @@ static int selinux_ib_endport_manage_subnet(void *ib_sec, const char *dev_name,
 		return err;
 
 	ad.type = LSM_AUDIT_DATA_IBENDPORT;
-	strncpy(ibendport.dev_name, dev_name, sizeof(ibendport.dev_name));
+	ibendport.dev_name = dev_name;
 	ibendport.port = port_num;
 	ad.u.ibendport = &ibendport;
 	return avc_has_perm(&selinux_state,

security/selinux/include/avc.h

@@ -111,7 +111,6 @@ int slow_avc_audit(struct selinux_state *state,
  * @avd: access vector decisions
  * @result: result from avc_has_perm_noaudit
  * @a:  auxiliary audit data
- * @flags: VFS walk flags
  *
  * Audit the granting or denial of permissions in accordance
  * with the policy.  This function is typically called by
@@ -127,16 +126,12 @@ static inline int avc_audit(struct selinux_state *state,
 			    u16 tclass, u32 requested,
 			    struct av_decision *avd,
 			    int result,
-			    struct common_audit_data *a,
-			    int flags)
+			    struct common_audit_data *a)
 {
 	u32 audited, denied;
 	audited = avc_audit_required(requested, avd, result, 0, &denied);
 	if (likely(!audited))
 		return 0;
-	/* fall back to ref-walk if we have to generate audit */
-	if (flags & MAY_NOT_BLOCK)
-		return -ECHILD;
 	return slow_avc_audit(state, ssid, tsid, tclass,
 			      requested, audited, denied, result,
 			      a);
@@ -144,7 +139,6 @@ static inline int avc_audit(struct selinux_state *state,
 
 #define AVC_STRICT 1 /* Ignore permissive mode. */
 #define AVC_EXTENDED_PERMS 2	/* update extended permissions */
-#define AVC_NONBLOCKING    4	/* non blocking */
 int avc_has_perm_noaudit(struct selinux_state *state,
 			 u32 ssid, u32 tsid,
 			 u16 tclass, u32 requested,
@@ -155,11 +149,6 @@ int avc_has_perm(struct selinux_state *state,
 		 u32 ssid, u32 tsid,
 		 u16 tclass, u32 requested,
 		 struct common_audit_data *auditdata);
-int avc_has_perm_flags(struct selinux_state *state,
-		       u32 ssid, u32 tsid,
-		       u16 tclass, u32 requested,
-		       struct common_audit_data *auditdata,
-		       int flags);
 
 int avc_has_extended_perms(struct selinux_state *state,
 			   u32 ssid, u32 tsid, u16 tclass, u32 requested,

security/selinux/include/xfrm.h

@@ -23,7 +23,7 @@ int selinux_xfrm_state_alloc_acquire(struct xfrm_state *x,
 				     struct xfrm_sec_ctx *polsec, u32 secid);
 void selinux_xfrm_state_free(struct xfrm_state *x);
 int selinux_xfrm_state_delete(struct xfrm_state *x);
-int selinux_xfrm_policy_lookup(struct xfrm_sec_ctx *ctx, u32 fl_secid, u8 dir);
+int selinux_xfrm_policy_lookup(struct xfrm_sec_ctx *ctx, u32 fl_secid);
 int selinux_xfrm_state_pol_flow_match(struct xfrm_state *x,
 				      struct xfrm_policy *xp,
 				      const struct flowi_common *flic);

security/selinux/ss/avtab.c

@@ -29,7 +29,7 @@ static struct kmem_cache *avtab_xperms_cachep __ro_after_init;
 /* Based on MurmurHash3, written by Austin Appleby and placed in the
  * public domain.
  */
-static inline int avtab_hash(struct avtab_key *keyp, u32 mask)
+static inline int avtab_hash(const struct avtab_key *keyp, u32 mask)
 {
 	static const u32 c1 = 0xcc9e2d51;
 	static const u32 c2 = 0x1b873593;
@@ -68,7 +68,7 @@ static inline int avtab_hash(struct avtab_key *keyp, u32 mask)
 static struct avtab_node*
 avtab_insert_node(struct avtab *h, int hvalue,
 		  struct avtab_node *prev, struct avtab_node *cur,
-		  struct avtab_key *key, struct avtab_datum *datum)
+		  const struct avtab_key *key, const struct avtab_datum *datum)
 {
 	struct avtab_node *newnode;
 	struct avtab_extended_perms *xperms;
@@ -103,7 +103,8 @@ avtab_insert_node(struct avtab *h, int hvalue,
 	return newnode;
 }
 
-static int avtab_insert(struct avtab *h, struct avtab_key *key, struct avtab_datum *datum)
+static int avtab_insert(struct avtab *h, const struct avtab_key *key,
+			const struct avtab_datum *datum)
 {
 	int hvalue;
 	struct avtab_node *prev, *cur, *newnode;
@@ -147,8 +148,9 @@ static int avtab_insert(struct avtab *h, struct avtab_key *key, struct avtab_dat
  * key/specified mask into the table, as needed by the conditional avtab.
  * It also returns a pointer to the node inserted.
  */
-struct avtab_node *
-avtab_insert_nonunique(struct avtab *h, struct avtab_key *key, struct avtab_datum *datum)
+struct avtab_node *avtab_insert_nonunique(struct avtab *h,
+					  const struct avtab_key *key,
+					  const struct avtab_datum *datum)
 {
 	int hvalue;
 	struct avtab_node *prev, *cur;
@@ -178,7 +180,7 @@ avtab_insert_nonunique(struct avtab *h, struct avtab_key *key, struct avtab_datu
 	return avtab_insert_node(h, hvalue, prev, cur, key, datum);
 }
 
-struct avtab_datum *avtab_search(struct avtab *h, struct avtab_key *key)
+struct avtab_datum *avtab_search(struct avtab *h, const struct avtab_key *key)
 {
 	int hvalue;
 	struct avtab_node *cur;
@@ -213,8 +215,8 @@ struct avtab_datum *avtab_search(struct avtab *h, struct avtab_key *key)
 /* This search function returns a node pointer, and can be used in
  * conjunction with avtab_search_next_node()
  */
-struct avtab_node*
-avtab_search_node(struct avtab *h, struct avtab_key *key)
+struct avtab_node *avtab_search_node(struct avtab *h,
+				     const struct avtab_key *key)
 {
 	int hvalue;
 	struct avtab_node *cur;
@@ -396,8 +398,8 @@ static uint16_t spec_order[] = {
 };
 
 int avtab_read_item(struct avtab *a, void *fp, struct policydb *pol,
-		    int (*insertf)(struct avtab *a, struct avtab_key *k,
-				   struct avtab_datum *d, void *p),
+		    int (*insertf)(struct avtab *a, const struct avtab_key *k,
+				   const struct avtab_datum *d, void *p),
 		    void *p)
 {
 	__le16 buf16[4];
@@ -557,8 +559,8 @@ int avtab_read_item(struct avtab *a, void *fp, struct policydb *pol,
 	return insertf(a, &key, &datum, p);
 }
 
-static int avtab_insertf(struct avtab *a, struct avtab_key *k,
-			 struct avtab_datum *d, void *p)
+static int avtab_insertf(struct avtab *a, const struct avtab_key *k,
+			 const struct avtab_datum *d, void *p)
 {
 	return avtab_insert(a, k, d);
 }
@@ -607,7 +609,7 @@ int avtab_read(struct avtab *a, void *fp, struct policydb *pol)
 	goto out;
 }
 
-int avtab_write_item(struct policydb *p, struct avtab_node *cur, void *fp)
+int avtab_write_item(struct policydb *p, const struct avtab_node *cur, void *fp)
 {
 	__le16 buf16[4];
 	__le32 buf32[ARRAY_SIZE(cur->datum.u.xperms->perms.p)];

security/selinux/ss/avtab.h

@@ -90,24 +90,26 @@ struct avtab {
 void avtab_init(struct avtab *h);
 int avtab_alloc(struct avtab *, u32);
 int avtab_alloc_dup(struct avtab *new, const struct avtab *orig);
-struct avtab_datum *avtab_search(struct avtab *h, struct avtab_key *k);
+struct avtab_datum *avtab_search(struct avtab *h, const struct avtab_key *k);
 void avtab_destroy(struct avtab *h);
 void avtab_hash_eval(struct avtab *h, char *tag);
 
 struct policydb;
 int avtab_read_item(struct avtab *a, void *fp, struct policydb *pol,
-		    int (*insert)(struct avtab *a, struct avtab_key *k,
-				  struct avtab_datum *d, void *p),
+		    int (*insert)(struct avtab *a, const struct avtab_key *k,
+				  const struct avtab_datum *d, void *p),
 		    void *p);
 
 int avtab_read(struct avtab *a, void *fp, struct policydb *pol);
-int avtab_write_item(struct policydb *p, struct avtab_node *cur, void *fp);
+int avtab_write_item(struct policydb *p, const struct avtab_node *cur, void *fp);
 int avtab_write(struct policydb *p, struct avtab *a, void *fp);
 
-struct avtab_node *avtab_insert_nonunique(struct avtab *h, struct avtab_key *key,
-					  struct avtab_datum *datum);
+struct avtab_node *avtab_insert_nonunique(struct avtab *h,
+					  const struct avtab_key *key,
+					  const struct avtab_datum *datum);
 
-struct avtab_node *avtab_search_node(struct avtab *h, struct avtab_key *key);
+struct avtab_node *avtab_search_node(struct avtab *h,
+				     const struct avtab_key *key);
 
 struct avtab_node *avtab_search_node_next(struct avtab_node *node, int specified);
 

security/selinux/ss/conditional.c

@@ -254,7 +254,8 @@ struct cond_insertf_data {
 	struct cond_av_list *other;
 };
 
-static int cond_insertf(struct avtab *a, struct avtab_key *k, struct avtab_datum *d, void *ptr)
+static int cond_insertf(struct avtab *a, const struct avtab_key *k,
+			const struct avtab_datum *d, void *ptr)
 {
 	struct cond_insertf_data *data = ptr;
 	struct policydb *p = data->p;
@@ -628,7 +629,8 @@ static int cond_dup_av_list(struct cond_av_list *new,
 static int duplicate_policydb_cond_list(struct policydb *newp,
 					struct policydb *origp)
 {
-	int rc, i, j;
+	int rc;
+	u32 i;
 
 	rc = avtab_alloc_dup(&newp->te_cond_avtab, &origp->te_cond_avtab);
 	if (rc)
@@ -648,12 +650,12 @@ static int duplicate_policydb_cond_list(struct policydb *newp,
 		newp->cond_list_len++;
 
 		newn->cur_state = orign->cur_state;
-		newn->expr.nodes = kcalloc(orign->expr.len,
-					sizeof(*newn->expr.nodes), GFP_KERNEL);
+		newn->expr.nodes = kmemdup(orign->expr.nodes,
+				orign->expr.len * sizeof(*orign->expr.nodes),
+				GFP_KERNEL);
 		if (!newn->expr.nodes)
 			goto error;
-		for (j = 0; j < orign->expr.len; j++)
-			newn->expr.nodes[j] = orign->expr.nodes[j];
+
 		newn->expr.len = orign->expr.len;
 
 		rc = cond_dup_av_list(&newn->true_list, &orign->true_list,

security/selinux/ss/policydb.c

@@ -2589,7 +2589,6 @@ int policydb_read(struct policydb *p, void *fp)
 		if (rc)
 			goto bad;
 
-		rc = -EINVAL;
 		rtk->role = le32_to_cpu(buf[0]);
 		rtk->type = le32_to_cpu(buf[1]);
 		rtd->new_role = le32_to_cpu(buf[2]);

security/selinux/ss/services.c

@@ -859,6 +859,7 @@ int security_validate_transition(struct selinux_state *state,
  * It returns 0, if @newsid is bounded by @oldsid.
  * Otherwise, it returns error code.
  *
+ * @state: SELinux state
  * @oldsid : current security identifier
  * @newsid : destinated security identifier
  */
@@ -1098,6 +1099,7 @@ void security_compute_xperms_decision(struct selinux_state *state,
 
 /**
  * security_compute_av - Compute access vector decisions.
+ * @state: SELinux state
  * @ssid: source security identifier
  * @tsid: target security identifier
  * @tclass: target security class
@@ -1386,6 +1388,7 @@ static int security_sid_to_context_core(struct selinux_state *state,
 
 /**
  * security_sid_to_context - Obtain a context for a given SID.
+ * @state: SELinux state
  * @sid: security identifier, SID
  * @scontext: security context
  * @scontext_len: length in bytes
@@ -1411,6 +1414,7 @@ int security_sid_to_context_force(struct selinux_state *state, u32 sid,
 /**
  * security_sid_to_context_inval - Obtain a context for a given SID if it
  *                                 is invalid.
+ * @state: SELinux state
  * @sid: security identifier, SID
  * @scontext: security context
  * @scontext_len: length in bytes
@@ -1587,6 +1591,7 @@ static int security_context_to_sid_core(struct selinux_state *state,
 
 /**
  * security_context_to_sid - Obtain a SID for a given security context.
+ * @state: SELinux state
  * @scontext: security context
  * @scontext_len: length in bytes
  * @sid: security identifier, SID
@@ -1616,6 +1621,7 @@ int security_context_str_to_sid(struct selinux_state *state,
  * security_context_to_sid_default - Obtain a SID for a given security context,
  * falling back to specified default if needed.
  *
+ * @state: SELinux state
  * @scontext: security context
  * @scontext_len: length in bytes
  * @sid: security identifier, SID
@@ -1907,6 +1913,7 @@ static int security_compute_sid(struct selinux_state *state,
 
 /**
  * security_transition_sid - Compute the SID for a new subject/object.
+ * @state: SELinux state
  * @ssid: source security identifier
  * @tsid: target security identifier
  * @tclass: target security class
@@ -1962,6 +1969,7 @@ int security_member_sid(struct selinux_state *state,
 
 /**
  * security_change_sid - Compute the SID for object relabeling.
+ * @state: SELinux state
  * @ssid: source security identifier
  * @tsid: target security identifier
  * @tclass: target security class
@@ -2060,7 +2068,6 @@ static int convert_context(struct context *oldc, struct context *newc, void *p)
 	context_init(newc);
 
 	/* Convert the user. */
-	rc = -EINVAL;
 	usrdatum = symtab_search(&args->newp->p_users,
 				 sym_name(args->oldp,
 					  SYM_USERS, oldc->user - 1));
@@ -2069,7 +2076,6 @@ static int convert_context(struct context *oldc, struct context *newc, void *p)
 	newc->user = usrdatum->value;
 
 	/* Convert the role. */
-	rc = -EINVAL;
 	role = symtab_search(&args->newp->p_roles,
 			     sym_name(args->oldp, SYM_ROLES, oldc->role - 1));
 	if (!role)
@@ -2077,7 +2083,6 @@ static int convert_context(struct context *oldc, struct context *newc, void *p)
 	newc->role = role->value;
 
 	/* Convert the type. */
-	rc = -EINVAL;
 	typdatum = symtab_search(&args->newp->p_types,
 				 sym_name(args->oldp,
 					  SYM_TYPES, oldc->type - 1));
@@ -2101,7 +2106,6 @@ static int convert_context(struct context *oldc, struct context *newc, void *p)
 		oc = args->newp->ocontexts[OCON_ISID];
 		while (oc && oc->sid[0] != SECINITSID_UNLABELED)
 			oc = oc->next;
-		rc = -EINVAL;
 		if (!oc) {
 			pr_err("SELinux:  unable to look up"
 				" the initial SIDs list\n");
@@ -2264,6 +2268,7 @@ void selinux_policy_commit(struct selinux_state *state,
 
 /**
  * security_load_policy - Load a security policy configuration.
+ * @state: SELinux state
  * @data: binary policy data
  * @len: length of data in bytes
  *
@@ -2371,6 +2376,7 @@ int security_load_policy(struct selinux_state *state, void *data, size_t len,
 
 /**
  * security_port_sid - Obtain the SID for a port.
+ * @state: SELinux state
  * @protocol: protocol number
  * @port: port number
  * @out_sid: security identifier
@@ -2427,7 +2433,8 @@ int security_port_sid(struct selinux_state *state,
 }
 
 /**
- * security_pkey_sid - Obtain the SID for a pkey.
+ * security_ib_pkey_sid - Obtain the SID for a pkey.
+ * @state: SELinux state
  * @subnet_prefix: Subnet Prefix
  * @pkey_num: pkey number
  * @out_sid: security identifier
@@ -2486,6 +2493,7 @@ int security_ib_pkey_sid(struct selinux_state *state,
 
 /**
  * security_ib_endport_sid - Obtain the SID for a subnet management interface.
+ * @state: SELinux state
  * @dev_name: device name
  * @port: port number
  * @out_sid: security identifier
@@ -2544,6 +2552,7 @@ int security_ib_endport_sid(struct selinux_state *state,
 
 /**
  * security_netif_sid - Obtain the SID for a network interface.
+ * @state: SELinux state
  * @name: interface name
  * @if_sid: interface SID
  */
@@ -2618,6 +2627,7 @@ static int match_ipv6_addrmask(u32 *input, u32 *addr, u32 *mask)
 
 /**
  * security_node_sid - Obtain the SID for a node (host).
+ * @state: SELinux state
  * @domain: communication domain aka address family
  * @addrp: address
  * @addrlen: address length in bytes
@@ -2711,6 +2721,7 @@ int security_node_sid(struct selinux_state *state,
 
 /**
  * security_get_user_sids - Obtain reachable SIDs for a user.
+ * @state: SELinux state
  * @fromsid: starting SID
  * @username: username
  * @sids: array of reachable SIDs for user
@@ -2903,6 +2914,7 @@ static inline int __security_genfs_sid(struct selinux_policy *policy,
 
 /**
  * security_genfs_sid - Obtain a SID for a file in a filesystem
+ * @state: SELinux state
  * @fstype: filesystem type
  * @path: path from root of mount
  * @sclass: file security class
@@ -2947,6 +2959,7 @@ int selinux_policy_genfs_sid(struct selinux_policy *policy,
 
 /**
  * security_fs_use - Determine how to handle labeling for a filesystem.
+ * @state: SELinux state
  * @sb: superblock in question
  */
 int security_fs_use(struct selinux_state *state, struct super_block *sb)
@@ -3286,6 +3299,7 @@ int security_sid_mls_copy(struct selinux_state *state,
 
 /**
  * security_net_peersid_resolve - Compare and resolve two network peer SIDs
+ * @state: SELinux state
  * @nlbl_sid: NetLabel SID
  * @nlbl_type: NetLabel labeling protocol type
  * @xfrm_sid: XFRM SID
@@ -3510,6 +3524,7 @@ int security_get_allow_unknown(struct selinux_state *state)
 
 /**
  * security_policycap_supported - Check for a specific policy capability
+ * @state: SELinux state
  * @req_cap: capability
  *
  * Description:
@@ -3844,6 +3859,7 @@ static void security_netlbl_cache_add(struct netlbl_lsm_secattr *secattr,
 
 /**
  * security_netlbl_secattr_to_sid - Convert a NetLabel secattr to a SELinux SID
+ * @state: SELinux state
  * @secattr: the NetLabel packet security attributes
  * @sid: the SELinux SID
  *
@@ -3926,6 +3942,7 @@ int security_netlbl_secattr_to_sid(struct selinux_state *state,
 
 /**
  * security_netlbl_sid_to_secattr - Convert a SELinux SID to a NetLabel secattr
+ * @state: SELinux state
  * @sid: the SELinux SID
  * @secattr: the NetLabel packet security attributes
  *

security/selinux/xfrm.c

@@ -150,7 +150,7 @@ static int selinux_xfrm_delete(struct xfrm_sec_ctx *ctx)
  * LSM hook implementation that authorizes that a flow can use a xfrm policy
  * rule.
  */
-int selinux_xfrm_policy_lookup(struct xfrm_sec_ctx *ctx, u32 fl_secid, u8 dir)
+int selinux_xfrm_policy_lookup(struct xfrm_sec_ctx *ctx, u32 fl_secid)
 {
 	int rc;