selinux/stable-5.18 PR 20220321

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Merge tag 'selinux-pr-20220321' of git://git.kernel.org/pub/scm/linux/kernel/git/pcmoore/selinux

Pull selinux updates from Paul Moore:
 "We've got a number of SELinux patches queued up, the highlights are:

   - Fixup the security_fs_context_parse_param() LSM hook so it executes
     all of the LSM hook implementations unless a serious error occurs.

     We also correct the SELinux hook implementation so that it returns
     zero on success.

   - In addition to a few SELinux mount option parsing fixes, we
     simplified the parsing by moving it earlier in the process.

     The logic was that it was unlikely an admin/user would use the new
     mount API and not have the policy loaded before passing the SELinux
     options.

   - Properly fixed the LSM/SELinux/SCTP hooks with the addition of the
     security_sctp_assoc_established() hook.

     This work was done in conjunction with the netdev folks and should
     complete the move of the SCTP labeling from the endpoints to the
     associations.

   - Fixed a variety of sparse warnings caused by changes in the "__rcu"
     markings of some core kernel structures.

   - Ensure we access the superblock's LSM security blob using the
     stacking-safe accessors.

   - Added the ability for the kernel to always allow FIOCLEX and
     FIONCLEX if the "ioctl_skip_cloexec" policy capability is
     specified.

   - Various constifications improvements, type casting improvements,
     additional return value checks, and dead code/parameter removal.

   - Documentation fixes"

* tag 'selinux-pr-20220321' of git://git.kernel.org/pub/scm/linux/kernel/git/pcmoore/selinux: (23 commits)
  selinux: shorten the policy capability enum names
  docs: fix 'make htmldocs' warning in SCTP.rst
  selinux: allow FIOCLEX and FIONCLEX with policy capability
  selinux: use correct type for context length
  selinux: drop return statement at end of void functions
  security: implement sctp_assoc_established hook in selinux
  security: add sctp_assoc_established hook
  selinux: parse contexts for mount options early
  selinux: various sparse fixes
  selinux: try to use preparsed sid before calling parse_sid()
  selinux: Fix selinux_sb_mnt_opts_compat()
  LSM: general protection fault in legacy_parse_param
  selinux: fix a type cast problem in cred_init_security()
  selinux: drop unused macro
  selinux: simplify cred_init_security
  selinux: do not discard const qualifier in cast
  selinux: drop unused parameter of avtab_insert_node
  selinux: drop cast to same type
  selinux: enclose macro arguments in parenthesis
  selinux: declare name parameter of hash_eval const
  ...

Documentation/security/SCTP.rst

@@ -15,10 +15,7 @@ For security module support, three SCTP specific hooks have been implemented::
     security_sctp_assoc_request()
     security_sctp_bind_connect()
     security_sctp_sk_clone()
-
+    security_sctp_assoc_established()
-Also the following security hook has been utilised::
-
-    security_inet_conn_established()
 
 The usage of these hooks are described below with the SELinux implementation
 described in the `SCTP SELinux Support`_ chapter.
@@ -122,11 +119,12 @@ calls **sctp_peeloff**\(3).
     @newsk - pointer to new sock structure.
 
 
-security_inet_conn_established()
+security_sctp_assoc_established()
-~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-Called when a COOKIE ACK is received::
+Called when a COOKIE ACK is received, and the peer secid will be
+saved into ``@asoc->peer_secid`` for client::
 
-    @sk  - pointer to sock structure.
+    @asoc - pointer to sctp association structure.
     @skb - pointer to skbuff of the COOKIE ACK packet.
 
 
@@ -134,7 +132,7 @@ Security Hooks used for Association Establishment
 -------------------------------------------------
 
 The following diagram shows the use of ``security_sctp_bind_connect()``,
-``security_sctp_assoc_request()``, ``security_inet_conn_established()`` when
+``security_sctp_assoc_request()``, ``security_sctp_assoc_established()`` when
 establishing an association.
 ::
 
@@ -172,7 +170,7 @@ establishing an association.
           <------------------------------------------- COOKIE ACK
           |                                               |
     sctp_sf_do_5_1E_ca                                    |
- Call security_inet_conn_established()                    |
+ Call security_sctp_assoc_established()                   |
  to set the peer label.                                   |
           |                                               |
           |                               If SCTP_SOCKET_TCP or peeled off
@@ -198,7 +196,7 @@ hooks with the SELinux specifics expanded below::
     security_sctp_assoc_request()
     security_sctp_bind_connect()
     security_sctp_sk_clone()
-    security_inet_conn_established()
+    security_sctp_assoc_established()
 
 
 security_sctp_assoc_request()
@@ -271,12 +269,12 @@ sockets sid and peer sid to that contained in the ``@asoc sid`` and
     @newsk - pointer to new sock structure.
 
 
-security_inet_conn_established()
+security_sctp_assoc_established()
-~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 Called when a COOKIE ACK is received where it sets the connection's peer sid
 to that in ``@skb``::
 
-    @sk  - pointer to sock structure.
+    @asoc - pointer to sctp association structure.
     @skb - pointer to skbuff of the COOKIE ACK packet.
 
 

include/linux/lsm_hook_defs.h

@@ -332,6 +332,8 @@ LSM_HOOK(int, 0, sctp_bind_connect, struct sock *sk, int optname,
 	 struct sockaddr *address, int addrlen)
 LSM_HOOK(void, LSM_RET_VOID, sctp_sk_clone, struct sctp_association *asoc,
 	 struct sock *sk, struct sock *newsk)
+LSM_HOOK(int, 0, sctp_assoc_established, struct sctp_association *asoc,
+	 struct sk_buff *skb)
 #endif /* CONFIG_SECURITY_NETWORK */
 
 #ifdef CONFIG_SECURITY_INFINIBAND

include/linux/lsm_hooks.h

@@ -1046,6 +1046,11 @@
  *	@asoc pointer to current sctp association structure.
  *	@sk pointer to current sock structure.
  *	@newsk pointer to new sock structure.
+ * @sctp_assoc_established:
+ *	Passes the @asoc and @chunk->skb of the association COOKIE_ACK packet
+ *	to the security module.
+ *	@asoc pointer to sctp association structure.
+ *	@skb pointer to skbuff of association packet.
  *
  * Security hooks for Infiniband
  *

include/linux/security.h

@@ -1422,6 +1422,8 @@ int security_sctp_bind_connect(struct sock *sk, int optname,
 			       struct sockaddr *address, int addrlen);
 void security_sctp_sk_clone(struct sctp_association *asoc, struct sock *sk,
 			    struct sock *newsk);
+int security_sctp_assoc_established(struct sctp_association *asoc,
+				    struct sk_buff *skb);
 
 #else	/* CONFIG_SECURITY_NETWORK */
 static inline int security_unix_stream_connect(struct sock *sock,
@@ -1641,6 +1643,12 @@ static inline void security_sctp_sk_clone(struct sctp_association *asoc,
 					  struct sock *newsk)
 {
 }
+
+static inline int security_sctp_assoc_established(struct sctp_association *asoc,
+						  struct sk_buff *skb)
+{
+	return 0;
+}
 #endif	/* CONFIG_SECURITY_NETWORK */
 
 #ifdef CONFIG_SECURITY_INFINIBAND

net/sctp/sm_statefuns.c

@@ -930,6 +930,11 @@ enum sctp_disposition sctp_sf_do_5_1E_ca(struct net *net,
 	if (!sctp_vtag_verify(chunk, asoc))
 		return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands);
 
+	/* Set peer label for connection. */
+	if (security_sctp_assoc_established((struct sctp_association *)asoc,
+					    chunk->skb))
+		return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands);
+
 	/* Verify that the chunk length for the COOKIE-ACK is OK.
 	 * If we don't do this, any bundled chunks may be junked.
 	 */
@@ -945,9 +950,6 @@ enum sctp_disposition sctp_sf_do_5_1E_ca(struct net *net,
 	 */
 	sctp_add_cmd_sf(commands, SCTP_CMD_INIT_COUNTER_RESET, SCTP_NULL());
 
-	/* Set peer label for connection. */
-	security_inet_conn_established(ep->base.sk, chunk->skb);
-
 	/* RFC 2960 5.1 Normal Establishment of an Association
 	 *
 	 * E) Upon reception of the COOKIE ACK, endpoint "A" will move

security/security.c

@@ -884,9 +884,22 @@ int security_fs_context_dup(struct fs_context *fc, struct fs_context *src_fc)
 	return call_int_hook(fs_context_dup, 0, fc, src_fc);
 }
 
-int security_fs_context_parse_param(struct fs_context *fc, struct fs_parameter *param)
+int security_fs_context_parse_param(struct fs_context *fc,
+				    struct fs_parameter *param)
 {
-	return call_int_hook(fs_context_parse_param, -ENOPARAM, fc, param);
+	struct security_hook_list *hp;
+	int trc;
+	int rc = -ENOPARAM;
+
+	hlist_for_each_entry(hp, &security_hook_heads.fs_context_parse_param,
+			     list) {
+		trc = hp->hook.fs_context_parse_param(fc, param);
+		if (trc == 0)
+			rc = 0;
+		else if (trc != -ENOPARAM)
+			return trc;
+	}
+	return rc;
 }
 
 int security_sb_alloc(struct super_block *sb)
@@ -2391,6 +2404,13 @@ void security_sctp_sk_clone(struct sctp_association *asoc, struct sock *sk,
 }
 EXPORT_SYMBOL(security_sctp_sk_clone);
 
+int security_sctp_assoc_established(struct sctp_association *asoc,
+				    struct sk_buff *skb)
+{
+	return call_int_hook(sctp_assoc_established, 0, asoc, skb);
+}
+EXPORT_SYMBOL(security_sctp_assoc_established);
+
 #endif	/* CONFIG_SECURITY_NETWORK */
 
 #ifdef CONFIG_SECURITY_INFINIBAND

security/selinux/hooks.c

@@ -211,10 +211,9 @@ static int selinux_lsm_notifier_avc_callback(u32 event)
  */
 static void cred_init_security(void)
 {
-	struct cred *cred = (struct cred *) current->real_cred;
 	struct task_security_struct *tsec;
 
-	tsec = selinux_cred(cred);
+	tsec = selinux_cred(unrcu_pointer(current->real_cred));
 	tsec->osid = tsec->sid = SECINITSID_KERNEL;
 }
 
@@ -341,17 +340,15 @@ static void inode_free_security(struct inode *inode)
 }
 
 struct selinux_mnt_opts {
-	const char *fscontext, *context, *rootcontext, *defcontext;
+	u32 fscontext_sid;
+	u32 context_sid;
+	u32 rootcontext_sid;
+	u32 defcontext_sid;
 };
 
 static void selinux_free_mnt_opts(void *mnt_opts)
 {
-	struct selinux_mnt_opts *opts = mnt_opts;
+	kfree(mnt_opts);
-	kfree(opts->fscontext);
-	kfree(opts->context);
-	kfree(opts->rootcontext);
-	kfree(opts->defcontext);
-	kfree(opts);
 }
 
 enum {
@@ -479,7 +476,7 @@ static int selinux_is_sblabel_mnt(struct super_block *sb)
 
 static int sb_check_xattr_support(struct super_block *sb)
 {
-	struct superblock_security_struct *sbsec = sb->s_security;
+	struct superblock_security_struct *sbsec = selinux_superblock(sb);
 	struct dentry *root = sb->s_root;
 	struct inode *root_inode = d_backing_inode(root);
 	u32 sid;
@@ -598,18 +595,6 @@ static int bad_option(struct superblock_security_struct *sbsec, char flag,
 	return 0;
 }
 
-static int parse_sid(struct super_block *sb, const char *s, u32 *sid,
-		     gfp_t gfp)
-{
-	int rc = security_context_str_to_sid(&selinux_state, s,
-					     sid, gfp);
-	if (rc)
-		pr_warn("SELinux: security_context_str_to_sid"
-		       "(%s) failed for (dev %s, type %s) errno=%d\n",
-		       s, sb->s_id, sb->s_type->name, rc);
-	return rc;
-}
-
 /*
  * Allow filesystems with binary mount data to explicitly set mount point
  * labeling information.
@@ -672,41 +657,29 @@ static int selinux_set_mnt_opts(struct super_block *sb,
 	 * than once with different security options.
 	 */
 	if (opts) {
-		if (opts->fscontext) {
+		if (opts->fscontext_sid) {
-			rc = parse_sid(sb, opts->fscontext, &fscontext_sid,
+			fscontext_sid = opts->fscontext_sid;
-					GFP_KERNEL);
-			if (rc)
-				goto out;
 			if (bad_option(sbsec, FSCONTEXT_MNT, sbsec->sid,
 					fscontext_sid))
 				goto out_double_mount;
 			sbsec->flags |= FSCONTEXT_MNT;
 		}
-		if (opts->context) {
+		if (opts->context_sid) {
-			rc = parse_sid(sb, opts->context, &context_sid,
+			context_sid = opts->context_sid;
-					GFP_KERNEL);
-			if (rc)
-				goto out;
 			if (bad_option(sbsec, CONTEXT_MNT, sbsec->mntpoint_sid,
 					context_sid))
 				goto out_double_mount;
 			sbsec->flags |= CONTEXT_MNT;
 		}
-		if (opts->rootcontext) {
+		if (opts->rootcontext_sid) {
-			rc = parse_sid(sb, opts->rootcontext, &rootcontext_sid,
+			rootcontext_sid = opts->rootcontext_sid;
-					GFP_KERNEL);
-			if (rc)
-				goto out;
 			if (bad_option(sbsec, ROOTCONTEXT_MNT, root_isec->sid,
 					rootcontext_sid))
 				goto out_double_mount;
 			sbsec->flags |= ROOTCONTEXT_MNT;
 		}
-		if (opts->defcontext) {
+		if (opts->defcontext_sid) {
-			rc = parse_sid(sb, opts->defcontext, &defcontext_sid,
+			defcontext_sid = opts->defcontext_sid;
-					GFP_KERNEL);
-			if (rc)
-				goto out;
 			if (bad_option(sbsec, DEFCONTEXT_MNT, sbsec->def_sid,
 					defcontext_sid))
 				goto out_double_mount;
@@ -976,6 +949,8 @@ static int selinux_add_opt(int token, const char *s, void **mnt_opts)
 {
 	struct selinux_mnt_opts *opts = *mnt_opts;
 	bool is_alloc_opts = false;
+	u32 *dst_sid;
+	int rc;
 
 	if (token == Opt_seclabel)
 		/* eaten and completely ignored */
@@ -983,6 +958,11 @@ static int selinux_add_opt(int token, const char *s, void **mnt_opts)
 	if (!s)
 		return -ENOMEM;
 
+	if (!selinux_initialized(&selinux_state)) {
+		pr_warn("SELinux: Unable to set superblock options before the security server is initialized\n");
+		return -EINVAL;
+	}
+
 	if (!opts) {
 		opts = kzalloc(sizeof(*opts), GFP_KERNEL);
 		if (!opts)
@@ -993,28 +973,34 @@ static int selinux_add_opt(int token, const char *s, void **mnt_opts)
 
 	switch (token) {
 	case Opt_context:
-		if (opts->context || opts->defcontext)
+		if (opts->context_sid || opts->defcontext_sid)
 			goto err;
-		opts->context = s;
+		dst_sid = &opts->context_sid;
 		break;
 	case Opt_fscontext:
-		if (opts->fscontext)
+		if (opts->fscontext_sid)
 			goto err;
-		opts->fscontext = s;
+		dst_sid = &opts->fscontext_sid;
 		break;
 	case Opt_rootcontext:
-		if (opts->rootcontext)
+		if (opts->rootcontext_sid)
 			goto err;
-		opts->rootcontext = s;
+		dst_sid = &opts->rootcontext_sid;
 		break;
 	case Opt_defcontext:
-		if (opts->context || opts->defcontext)
+		if (opts->context_sid || opts->defcontext_sid)
 			goto err;
-		opts->defcontext = s;
+		dst_sid = &opts->defcontext_sid;
 		break;
+	default:
+		WARN_ON(1);
+		return -EINVAL;
 	}
-
+	rc = security_context_str_to_sid(&selinux_state, s, dst_sid, GFP_KERNEL);
-	return 0;
+	if (rc)
+		pr_warn("SELinux: security_context_str_to_sid (%s) failed with errno=%d\n",
+			s, rc);
+	return rc;
 
 err:
 	if (is_alloc_opts) {
@@ -2535,7 +2521,7 @@ static void selinux_bprm_committed_creds(struct linux_binprm *bprm)
 	if (rc) {
 		clear_itimer();
 
-		spin_lock_irq(&current->sighand->siglock);
+		spin_lock_irq(&unrcu_pointer(current->sighand)->siglock);
 		if (!fatal_signal_pending(current)) {
 			flush_sigqueue(&current->pending);
 			flush_sigqueue(&current->signal->shared_pending);
@@ -2543,13 +2529,13 @@ static void selinux_bprm_committed_creds(struct linux_binprm *bprm)
 			sigemptyset(&current->blocked);
 			recalc_sigpending();
 		}
-		spin_unlock_irq(&current->sighand->siglock);
+		spin_unlock_irq(&unrcu_pointer(current->sighand)->siglock);
 	}
 
 	/* Wake up the parent if it is waiting so that it can recheck
 	 * wait permission to the new task SID. */
 	read_lock(&tasklist_lock);
-	__wake_up_parent(current, current->real_parent);
+	__wake_up_parent(current, unrcu_pointer(current->real_parent));
 	read_unlock(&tasklist_lock);
 }
 
@@ -2647,9 +2633,7 @@ free_opt:
 static int selinux_sb_mnt_opts_compat(struct super_block *sb, void *mnt_opts)
 {
 	struct selinux_mnt_opts *opts = mnt_opts;
-	struct superblock_security_struct *sbsec = sb->s_security;
+	struct superblock_security_struct *sbsec = selinux_superblock(sb);
-	u32 sid;
-	int rc;
 
 	/*
 	 * Superblock not initialized (i.e. no options) - reject if any
@@ -2665,35 +2649,27 @@ static int selinux_sb_mnt_opts_compat(struct super_block *sb, void *mnt_opts)
 	if (!opts)
 		return (sbsec->flags & SE_MNTMASK) ? 1 : 0;
 
-	if (opts->fscontext) {
+	if (opts->fscontext_sid) {
-		rc = parse_sid(sb, opts->fscontext, &sid, GFP_NOWAIT);
+		if (bad_option(sbsec, FSCONTEXT_MNT, sbsec->sid,
-		if (rc)
+			       opts->fscontext_sid))
-			return 1;
-		if (bad_option(sbsec, FSCONTEXT_MNT, sbsec->sid, sid))
 			return 1;
 	}
-	if (opts->context) {
+	if (opts->context_sid) {
-		rc = parse_sid(sb, opts->context, &sid, GFP_NOWAIT);
+		if (bad_option(sbsec, CONTEXT_MNT, sbsec->mntpoint_sid,
-		if (rc)
+			       opts->context_sid))
-			return 1;
-		if (bad_option(sbsec, CONTEXT_MNT, sbsec->mntpoint_sid, sid))
 			return 1;
 	}
-	if (opts->rootcontext) {
+	if (opts->rootcontext_sid) {
 		struct inode_security_struct *root_isec;
 
 		root_isec = backing_inode_security(sb->s_root);
-		rc = parse_sid(sb, opts->rootcontext, &sid, GFP_NOWAIT);
+		if (bad_option(sbsec, ROOTCONTEXT_MNT, root_isec->sid,
-		if (rc)
+			       opts->rootcontext_sid))
-			return 1;
-		if (bad_option(sbsec, ROOTCONTEXT_MNT, root_isec->sid, sid))
 			return 1;
 	}
-	if (opts->defcontext) {
+	if (opts->defcontext_sid) {
-		rc = parse_sid(sb, opts->defcontext, &sid, GFP_NOWAIT);
+		if (bad_option(sbsec, DEFCONTEXT_MNT, sbsec->def_sid,
-		if (rc)
+			       opts->defcontext_sid))
-			return 1;
-		if (bad_option(sbsec, DEFCONTEXT_MNT, sbsec->def_sid, sid))
 			return 1;
 	}
 	return 0;
@@ -2703,8 +2679,6 @@ static int selinux_sb_remount(struct super_block *sb, void *mnt_opts)
 {
 	struct selinux_mnt_opts *opts = mnt_opts;
 	struct superblock_security_struct *sbsec = selinux_superblock(sb);
-	u32 sid;
-	int rc;
 
 	if (!(sbsec->flags & SE_SBINITIALIZED))
 		return 0;
@@ -2712,34 +2686,26 @@ static int selinux_sb_remount(struct super_block *sb, void *mnt_opts)
 	if (!opts)
 		return 0;
 
-	if (opts->fscontext) {
+	if (opts->fscontext_sid) {
-		rc = parse_sid(sb, opts->fscontext, &sid, GFP_KERNEL);
+		if (bad_option(sbsec, FSCONTEXT_MNT, sbsec->sid,
-		if (rc)
+			       opts->fscontext_sid))
-			return rc;
-		if (bad_option(sbsec, FSCONTEXT_MNT, sbsec->sid, sid))
 			goto out_bad_option;
 	}
-	if (opts->context) {
+	if (opts->context_sid) {
-		rc = parse_sid(sb, opts->context, &sid, GFP_KERNEL);
+		if (bad_option(sbsec, CONTEXT_MNT, sbsec->mntpoint_sid,
-		if (rc)
+			       opts->context_sid))
-			return rc;
-		if (bad_option(sbsec, CONTEXT_MNT, sbsec->mntpoint_sid, sid))
 			goto out_bad_option;
 	}
-	if (opts->rootcontext) {
+	if (opts->rootcontext_sid) {
 		struct inode_security_struct *root_isec;
 		root_isec = backing_inode_security(sb->s_root);
-		rc = parse_sid(sb, opts->rootcontext, &sid, GFP_KERNEL);
+		if (bad_option(sbsec, ROOTCONTEXT_MNT, root_isec->sid,
-		if (rc)
+			       opts->rootcontext_sid))
-			return rc;
-		if (bad_option(sbsec, ROOTCONTEXT_MNT, root_isec->sid, sid))
 			goto out_bad_option;
 	}
-	if (opts->defcontext) {
+	if (opts->defcontext_sid) {
-		rc = parse_sid(sb, opts->defcontext, &sid, GFP_KERNEL);
+		if (bad_option(sbsec, DEFCONTEXT_MNT, sbsec->def_sid,
-		if (rc)
+			       opts->defcontext_sid))
-			return rc;
-		if (bad_option(sbsec, DEFCONTEXT_MNT, sbsec->def_sid, sid))
 			goto out_bad_option;
 	}
 	return 0;
@@ -2806,38 +2772,12 @@ static int selinux_fs_context_dup(struct fs_context *fc,
 				  struct fs_context *src_fc)
 {
 	const struct selinux_mnt_opts *src = src_fc->security;
-	struct selinux_mnt_opts *opts;
 
 	if (!src)
 		return 0;
 
-	fc->security = kzalloc(sizeof(struct selinux_mnt_opts), GFP_KERNEL);
+	fc->security = kmemdup(src, sizeof(*src), GFP_KERNEL);
-	if (!fc->security)
+	return fc->security ? 0 : -ENOMEM;
-		return -ENOMEM;
-
-	opts = fc->security;
-
-	if (src->fscontext) {
-		opts->fscontext = kstrdup(src->fscontext, GFP_KERNEL);
-		if (!opts->fscontext)
-			return -ENOMEM;
-	}
-	if (src->context) {
-		opts->context = kstrdup(src->context, GFP_KERNEL);
-		if (!opts->context)
-			return -ENOMEM;
-	}
-	if (src->rootcontext) {
-		opts->rootcontext = kstrdup(src->rootcontext, GFP_KERNEL);
-		if (!opts->rootcontext)
-			return -ENOMEM;
-	}
-	if (src->defcontext) {
-		opts->defcontext = kstrdup(src->defcontext, GFP_KERNEL);
-		if (!opts->defcontext)
-			return -ENOMEM;
-	}
-	return 0;
 }
 
 static const struct fs_parameter_spec selinux_fs_parameters[] = {
@@ -2860,10 +2800,9 @@ static int selinux_fs_context_parse_param(struct fs_context *fc,
 		return opt;
 
 	rc = selinux_add_opt(opt, param->string, &fc->security);
-	if (!rc) {
+	if (!rc)
 		param->string = NULL;
-		rc = 1;
+
-	}
 	return rc;
 }
 
@@ -3345,8 +3284,6 @@ static void selinux_inode_post_setxattr(struct dentry *dentry, const char *name,
 	isec->sid = newsid;
 	isec->initialized = LABEL_INITIALIZED;
 	spin_unlock(&isec->lock);
-
-	return;
 }
 
 static int selinux_inode_getxattr(struct dentry *dentry, const char *name)
@@ -3745,6 +3682,12 @@ static int selinux_file_ioctl(struct file *file, unsigned int cmd,
 					    CAP_OPT_NONE, true);
 		break;
 
+	case FIOCLEX:
+	case FIONCLEX:
+		if (!selinux_policycap_ioctl_skip_cloexec())
+			error = ioctl_has_perm(cred, file, FILE__IOCTL, (u16) cmd);
+		break;
+
 	/* default case assumes that the command will go
 	 * to the file's ioctl() function.
 	 */
@@ -5299,37 +5242,38 @@ static void selinux_sock_graft(struct sock *sk, struct socket *parent)
 	sksec->sclass = isec->sclass;
 }
 
-/* Called whenever SCTP receives an INIT chunk. This happens when an incoming
+/*
- * connect(2), sctp_connectx(3) or sctp_sendmsg(3) (with no association
+ * Determines peer_secid for the asoc and updates socket's peer label
- * already present).
+ * if it's the first association on the socket.
  */
-static int selinux_sctp_assoc_request(struct sctp_association *asoc,
+static int selinux_sctp_process_new_assoc(struct sctp_association *asoc,
-				      struct sk_buff *skb)
+					  struct sk_buff *skb)
 {
-	struct sk_security_struct *sksec = asoc->base.sk->sk_security;
+	struct sock *sk = asoc->base.sk;
+	u16 family = sk->sk_family;
+	struct sk_security_struct *sksec = sk->sk_security;
 	struct common_audit_data ad;
 	struct lsm_network_audit net = {0,};
-	u8 peerlbl_active;
+	int err;
-	u32 peer_sid = SECINITSID_UNLABELED;
-	u32 conn_sid;
-	int err = 0;
 
-	if (!selinux_policycap_extsockclass())
+	/* handle mapped IPv4 packets arriving via IPv6 sockets */
-		return 0;
+	if (family == PF_INET6 && skb->protocol == htons(ETH_P_IP))
+		family = PF_INET;
 
-	peerlbl_active = selinux_peerlbl_enabled();
+	if (selinux_peerlbl_enabled()) {
+		asoc->peer_secid = SECSID_NULL;
 
-	if (peerlbl_active) {
 		/* This will return peer_sid = SECSID_NULL if there are
 		 * no peer labels, see security_net_peersid_resolve().
 		 */
-		err = selinux_skb_peerlbl_sid(skb, asoc->base.sk->sk_family,
+		err = selinux_skb_peerlbl_sid(skb, family, &asoc->peer_secid);
-					      &peer_sid);
 		if (err)
 			return err;
 
-		if (peer_sid == SECSID_NULL)
+		if (asoc->peer_secid == SECSID_NULL)
-			peer_sid = SECINITSID_UNLABELED;
+			asoc->peer_secid = SECINITSID_UNLABELED;
+	} else {
+		asoc->peer_secid = SECINITSID_UNLABELED;
 	}
 
 	if (sksec->sctp_assoc_state == SCTP_ASSOC_UNSET) {
@@ -5340,8 +5284,8 @@ static int selinux_sctp_assoc_request(struct sctp_association *asoc,
 		 * then it is approved by policy and used as the primary
 		 * peer SID for getpeercon(3).
 		 */
-		sksec->peer_sid = peer_sid;
+		sksec->peer_sid = asoc->peer_secid;
-	} else if  (sksec->peer_sid != peer_sid) {
+	} else if (sksec->peer_sid != asoc->peer_secid) {
 		/* Other association peer SIDs are checked to enforce
 		 * consistency among the peer SIDs.
 		 */
@@ -5349,11 +5293,32 @@ static int selinux_sctp_assoc_request(struct sctp_association *asoc,
 		ad.u.net = &net;
 		ad.u.net->sk = asoc->base.sk;
 		err = avc_has_perm(&selinux_state,
-				   sksec->peer_sid, peer_sid, sksec->sclass,
+				   sksec->peer_sid, asoc->peer_secid,
-				   SCTP_SOCKET__ASSOCIATION, &ad);
+				   sksec->sclass, SCTP_SOCKET__ASSOCIATION,
+				   &ad);
 		if (err)
 			return err;
 	}
+	return 0;
+}
+
+/* Called whenever SCTP receives an INIT or COOKIE ECHO chunk. This
+ * happens on an incoming connect(2), sctp_connectx(3) or
+ * sctp_sendmsg(3) (with no association already present).
+ */
+static int selinux_sctp_assoc_request(struct sctp_association *asoc,
+				      struct sk_buff *skb)
+{
+	struct sk_security_struct *sksec = asoc->base.sk->sk_security;
+	u32 conn_sid;
+	int err;
+
+	if (!selinux_policycap_extsockclass())
+		return 0;
+
+	err = selinux_sctp_process_new_assoc(asoc, skb);
+	if (err)
+		return err;
 
 	/* Compute the MLS component for the connection and store
 	 * the information in asoc. This will be used by SCTP TCP type
@@ -5361,17 +5326,36 @@ static int selinux_sctp_assoc_request(struct sctp_association *asoc,
 	 * socket to be generated. selinux_sctp_sk_clone() will then
 	 * plug this into the new socket.
 	 */
-	err = selinux_conn_sid(sksec->sid, peer_sid, &conn_sid);
+	err = selinux_conn_sid(sksec->sid, asoc->peer_secid, &conn_sid);
 	if (err)
 		return err;
 
 	asoc->secid = conn_sid;
-	asoc->peer_secid = peer_sid;
 
 	/* Set any NetLabel labels including CIPSO/CALIPSO options. */
 	return selinux_netlbl_sctp_assoc_request(asoc, skb);
 }
 
+/* Called when SCTP receives a COOKIE ACK chunk as the final
+ * response to an association request (initited by us).
+ */
+static int selinux_sctp_assoc_established(struct sctp_association *asoc,
+					  struct sk_buff *skb)
+{
+	struct sk_security_struct *sksec = asoc->base.sk->sk_security;
+
+	if (!selinux_policycap_extsockclass())
+		return 0;
+
+	/* Inherit secid from the parent socket - this will be picked up
+	 * by selinux_sctp_sk_clone() if the association gets peeled off
+	 * into a new socket.
+	 */
+	asoc->secid = sksec->sid;
+
+	return selinux_sctp_process_new_assoc(asoc, skb);
+}
+
 /* Check if sctp IPv4/IPv6 addresses are valid for binding or connecting
  * based on their @optname.
  */
@@ -7192,6 +7176,7 @@ static struct security_hook_list selinux_hooks[] __lsm_ro_after_init = {
 	LSM_HOOK_INIT(sctp_assoc_request, selinux_sctp_assoc_request),
 	LSM_HOOK_INIT(sctp_sk_clone, selinux_sctp_sk_clone),
 	LSM_HOOK_INIT(sctp_bind_connect, selinux_sctp_bind_connect),
+	LSM_HOOK_INIT(sctp_assoc_established, selinux_sctp_assoc_established),
 	LSM_HOOK_INIT(inet_conn_request, selinux_inet_conn_request),
 	LSM_HOOK_INIT(inet_csk_clone, selinux_inet_csk_clone),
 	LSM_HOOK_INIT(inet_conn_established, selinux_inet_conn_established),

security/selinux/ibpkey.c

@@ -104,7 +104,7 @@ static void sel_ib_pkey_insert(struct sel_ib_pkey *pkey)
 
 		tail = list_entry(
 			rcu_dereference_protected(
-				sel_ib_pkey_hash[idx].list.prev,
+				list_tail_rcu(&sel_ib_pkey_hash[idx].list),
 				lockdep_is_held(&sel_ib_pkey_lock)),
 			struct sel_ib_pkey, list);
 		list_del_rcu(&tail->list);

security/selinux/ima.c

@@ -29,7 +29,7 @@ static char *selinux_ima_collect_state(struct selinux_state *state)
 	buf_len = strlen("initialized=0;enforcing=0;checkreqprot=0;") + 1;
 
 	len = strlen(on);
-	for (i = 0; i < __POLICYDB_CAPABILITY_MAX; i++)
+	for (i = 0; i < __POLICYDB_CAP_MAX; i++)
 		buf_len += strlen(selinux_policycap_names[i]) + len;
 
 	buf = kzalloc(buf_len, GFP_KERNEL);
@@ -54,7 +54,7 @@ static char *selinux_ima_collect_state(struct selinux_state *state)
 	rc = strlcat(buf, checkreqprot_get(state) ? on : off, buf_len);
 	WARN_ON(rc >= buf_len);
 
-	for (i = 0; i < __POLICYDB_CAPABILITY_MAX; i++) {
+	for (i = 0; i < __POLICYDB_CAP_MAX; i++) {
 		rc = strlcat(buf, selinux_policycap_names[i], buf_len);
 		WARN_ON(rc >= buf_len);
 

security/selinux/include/policycap.h

@@ -4,17 +4,18 @@
 
 /* Policy capabilities */
 enum {
-	POLICYDB_CAPABILITY_NETPEER,
+	POLICYDB_CAP_NETPEER,
-	POLICYDB_CAPABILITY_OPENPERM,
+	POLICYDB_CAP_OPENPERM,
-	POLICYDB_CAPABILITY_EXTSOCKCLASS,
+	POLICYDB_CAP_EXTSOCKCLASS,
-	POLICYDB_CAPABILITY_ALWAYSNETWORK,
+	POLICYDB_CAP_ALWAYSNETWORK,
-	POLICYDB_CAPABILITY_CGROUPSECLABEL,
+	POLICYDB_CAP_CGROUPSECLABEL,
-	POLICYDB_CAPABILITY_NNP_NOSUID_TRANSITION,
+	POLICYDB_CAP_NNP_NOSUID_TRANSITION,
-	POLICYDB_CAPABILITY_GENFS_SECLABEL_SYMLINKS,
+	POLICYDB_CAP_GENFS_SECLABEL_SYMLINKS,
-	__POLICYDB_CAPABILITY_MAX
+	POLICYDB_CAP_IOCTL_SKIP_CLOEXEC,
+	__POLICYDB_CAP_MAX
 };
-#define POLICYDB_CAPABILITY_MAX (__POLICYDB_CAPABILITY_MAX - 1)
+#define POLICYDB_CAP_MAX (__POLICYDB_CAP_MAX - 1)
 
-extern const char *selinux_policycap_names[__POLICYDB_CAPABILITY_MAX];
+extern const char *selinux_policycap_names[__POLICYDB_CAP_MAX];
 
 #endif /* _SELINUX_POLICYCAP_H_ */

security/selinux/include/policycap_names.h

@@ -5,14 +5,15 @@
 #include "policycap.h"
 
 /* Policy capability names */
-const char *selinux_policycap_names[__POLICYDB_CAPABILITY_MAX] = {
+const char *selinux_policycap_names[__POLICYDB_CAP_MAX] = {
 	"network_peer_controls",
 	"open_perms",
 	"extended_socket_class",
 	"always_check_network",
 	"cgroup_seclabel",
 	"nnp_nosuid_transition",
-	"genfs_seclabel_symlinks"
+	"genfs_seclabel_symlinks",
+	"ioctl_skip_cloexec"
 };
 
 #endif /* _SELINUX_POLICYCAP_NAMES_H_ */

security/selinux/include/security.h

@@ -96,7 +96,7 @@ struct selinux_state {
 #endif
 	bool checkreqprot;
 	bool initialized;
-	bool policycap[__POLICYDB_CAPABILITY_MAX];
+	bool policycap[__POLICYDB_CAP_MAX];
 
 	struct page *status_page;
 	struct mutex status_lock;
@@ -174,49 +174,56 @@ static inline bool selinux_policycap_netpeer(void)
 {
 	struct selinux_state *state = &selinux_state;
 
-	return READ_ONCE(state->policycap[POLICYDB_CAPABILITY_NETPEER]);
+	return READ_ONCE(state->policycap[POLICYDB_CAP_NETPEER]);
 }
 
 static inline bool selinux_policycap_openperm(void)
 {
 	struct selinux_state *state = &selinux_state;
 
-	return READ_ONCE(state->policycap[POLICYDB_CAPABILITY_OPENPERM]);
+	return READ_ONCE(state->policycap[POLICYDB_CAP_OPENPERM]);
 }
 
 static inline bool selinux_policycap_extsockclass(void)
 {
 	struct selinux_state *state = &selinux_state;
 
-	return READ_ONCE(state->policycap[POLICYDB_CAPABILITY_EXTSOCKCLASS]);
+	return READ_ONCE(state->policycap[POLICYDB_CAP_EXTSOCKCLASS]);
 }
 
 static inline bool selinux_policycap_alwaysnetwork(void)
 {
 	struct selinux_state *state = &selinux_state;
 
-	return READ_ONCE(state->policycap[POLICYDB_CAPABILITY_ALWAYSNETWORK]);
+	return READ_ONCE(state->policycap[POLICYDB_CAP_ALWAYSNETWORK]);
 }
 
 static inline bool selinux_policycap_cgroupseclabel(void)
 {
 	struct selinux_state *state = &selinux_state;
 
-	return READ_ONCE(state->policycap[POLICYDB_CAPABILITY_CGROUPSECLABEL]);
+	return READ_ONCE(state->policycap[POLICYDB_CAP_CGROUPSECLABEL]);
 }
 
 static inline bool selinux_policycap_nnp_nosuid_transition(void)
 {
 	struct selinux_state *state = &selinux_state;
 
-	return READ_ONCE(state->policycap[POLICYDB_CAPABILITY_NNP_NOSUID_TRANSITION]);
+	return READ_ONCE(state->policycap[POLICYDB_CAP_NNP_NOSUID_TRANSITION]);
 }
 
 static inline bool selinux_policycap_genfs_seclabel_symlinks(void)
 {
 	struct selinux_state *state = &selinux_state;
 
-	return READ_ONCE(state->policycap[POLICYDB_CAPABILITY_GENFS_SECLABEL_SYMLINKS]);
+	return READ_ONCE(state->policycap[POLICYDB_CAP_GENFS_SECLABEL_SYMLINKS]);
+}
+
+static inline bool selinux_policycap_ioctl_skip_cloexec(void)
+{
+	struct selinux_state *state = &selinux_state;
+
+	return READ_ONCE(state->policycap[POLICYDB_CAP_IOCTL_SKIP_CLOEXEC]);
 }
 
 struct selinux_policy_convert_data;
@@ -254,8 +261,8 @@ struct av_decision {
 #define XPERMS_AUDITALLOW 2
 #define XPERMS_DONTAUDIT 4
 
-#define security_xperm_set(perms, x) (perms[x >> 5] |= 1 << (x & 0x1f))
+#define security_xperm_set(perms, x) ((perms)[(x) >> 5] |= 1 << ((x) & 0x1f))
-#define security_xperm_test(perms, x) (1 & (perms[x >> 5] >> (x & 0x1f)))
+#define security_xperm_test(perms, x) (1 & ((perms)[(x) >> 5] >> ((x) & 0x1f)))
 struct extended_perms_data {
 	u32 p[8];
 };
@@ -386,11 +393,11 @@ int security_get_allow_unknown(struct selinux_state *state);
 int security_fs_use(struct selinux_state *state, struct super_block *sb);
 
 int security_genfs_sid(struct selinux_state *state,
-		       const char *fstype, char *name, u16 sclass,
+		       const char *fstype, const char *path, u16 sclass,
 		       u32 *sid);
 
 int selinux_policy_genfs_sid(struct selinux_policy *policy,
-		       const char *fstype, char *name, u16 sclass,
+		       const char *fstype, const char *path, u16 sclass,
 		       u32 *sid);
 
 #ifdef CONFIG_NETLABEL

security/selinux/netnode.c

@@ -107,7 +107,7 @@ static struct sel_netnode *sel_netnode_find(const void *addr, u16 family)
 
 	switch (family) {
 	case PF_INET:
-		idx = sel_netnode_hashfn_ipv4(*(__be32 *)addr);
+		idx = sel_netnode_hashfn_ipv4(*(const __be32 *)addr);
 		break;
 	case PF_INET6:
 		idx = sel_netnode_hashfn_ipv6(addr);
@@ -121,7 +121,7 @@ static struct sel_netnode *sel_netnode_find(const void *addr, u16 family)
 		if (node->nsec.family == family)
 			switch (family) {
 			case PF_INET:
-				if (node->nsec.addr.ipv4 == *(__be32 *)addr)
+				if (node->nsec.addr.ipv4 == *(const __be32 *)addr)
 					return node;
 				break;
 			case PF_INET6:
@@ -164,8 +164,9 @@ static void sel_netnode_insert(struct sel_netnode *node)
 	if (sel_netnode_hash[idx].size == SEL_NETNODE_HASH_BKT_LIMIT) {
 		struct sel_netnode *tail;
 		tail = list_entry(
-			rcu_dereference_protected(sel_netnode_hash[idx].list.prev,
+			rcu_dereference_protected(
-						  lockdep_is_held(&sel_netnode_lock)),
+				list_tail_rcu(&sel_netnode_hash[idx].list),
+				lockdep_is_held(&sel_netnode_lock)),
 			struct sel_netnode, list);
 		list_del_rcu(&tail->list);
 		kfree_rcu(tail, rcu);

security/selinux/netport.c

@@ -113,7 +113,7 @@ static void sel_netport_insert(struct sel_netport *port)
 		struct sel_netport *tail;
 		tail = list_entry(
 			rcu_dereference_protected(
-				sel_netport_hash[idx].list.prev,
+				list_tail_rcu(&sel_netport_hash[idx].list),
 				lockdep_is_held(&sel_netport_lock)),
 			struct sel_netport, list);
 		list_del_rcu(&tail->list);

security/selinux/selinuxfs.c

@@ -1983,7 +1983,7 @@ static int sel_make_policycap(struct selinux_fs_info *fsi)
 	struct dentry *dentry = NULL;
 	struct inode *inode = NULL;
 
-	for (iter = 0; iter <= POLICYDB_CAPABILITY_MAX; iter++) {
+	for (iter = 0; iter <= POLICYDB_CAP_MAX; iter++) {
 		if (iter < ARRAY_SIZE(selinux_policycap_names))
 			dentry = d_alloc_name(fsi->policycap_dir,
 					      selinux_policycap_names[iter]);
@@ -2127,6 +2127,8 @@ static int sel_fill_super(struct super_block *sb, struct fs_context *fc)
 	}
 
 	ret = sel_make_avc_files(dentry);
+	if (ret)
+		goto err;
 
 	dentry = sel_make_dir(sb->s_root, "ss", &fsi->last_ino);
 	if (IS_ERR(dentry)) {

security/selinux/ss/avtab.c

@@ -67,7 +67,7 @@ static inline int avtab_hash(const 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_node *prev,
 		  const struct avtab_key *key, const struct avtab_datum *datum)
 {
 	struct avtab_node *newnode;
@@ -137,7 +137,7 @@ static int avtab_insert(struct avtab *h, const struct avtab_key *key,
 			break;
 	}
 
-	newnode = avtab_insert_node(h, hvalue, prev, cur, key, datum);
+	newnode = avtab_insert_node(h, hvalue, prev, key, datum);
 	if (!newnode)
 		return -ENOMEM;
 
@@ -177,7 +177,7 @@ struct avtab_node *avtab_insert_nonunique(struct avtab *h,
 		    key->target_class < cur->key.target_class)
 			break;
 	}
-	return avtab_insert_node(h, hvalue, prev, cur, key, datum);
+	return avtab_insert_node(h, hvalue, prev, key, datum);
 }
 
 struct avtab_datum *avtab_search(struct avtab *h, const struct avtab_key *key)

security/selinux/ss/conditional.c

@@ -567,8 +567,6 @@ void cond_compute_xperms(struct avtab *ctab, struct avtab_key *key,
 		if (node->key.specified & AVTAB_ENABLED)
 			services_compute_xperms_decision(xpermd, node);
 	}
-	return;
-
 }
 /* Determine whether additional permissions are granted by the conditional
  * av table, and if so, add them to the result

security/selinux/ss/ebitmap.c

@@ -359,7 +359,6 @@ void ebitmap_destroy(struct ebitmap *e)
 
 	e->highbit = 0;
 	e->node = NULL;
-	return;
 }
 
 int ebitmap_read(struct ebitmap *e, void *fp)

security/selinux/ss/ebitmap.h

@@ -118,9 +118,9 @@ static inline void ebitmap_node_clr_bit(struct ebitmap_node *n,
 }
 
 #define ebitmap_for_each_positive_bit(e, n, bit)	\
-	for (bit = ebitmap_start_positive(e, &n);	\
+	for ((bit) = ebitmap_start_positive(e, &(n));	\
-	     bit < ebitmap_length(e);			\
+	     (bit) < ebitmap_length(e);			\
-	     bit = ebitmap_next_positive(e, &n, bit))	\
+	     (bit) = ebitmap_next_positive(e, &(n), bit))	\
 
 int ebitmap_cmp(struct ebitmap *e1, struct ebitmap *e2);
 int ebitmap_cpy(struct ebitmap *dst, struct ebitmap *src);

security/selinux/ss/mls.c

@@ -156,7 +156,6 @@ void mls_sid_to_context(struct policydb *p,
 	}
 
 	*scontext = scontextp;
-	return;
 }
 
 int mls_level_isvalid(struct policydb *p, struct mls_level *l)

security/selinux/ss/policydb.c

@@ -41,8 +41,6 @@
 #include "mls.h"
 #include "services.h"
 
-#define _DEBUG_HASHES
-
 #ifdef DEBUG_HASHES
 static const char *symtab_name[SYM_NUM] = {
 	"common prefixes",
@@ -704,7 +702,7 @@ static void symtab_hash_eval(struct symtab *s)
 }
 
 #else
-static inline void hash_eval(struct hashtab *h, char *hash_name)
+static inline void hash_eval(struct hashtab *h, const char *hash_name)
 {
 }
 #endif

security/selinux/ss/services.c

@@ -529,8 +529,6 @@ out:
 	/* release scontext/tcontext */
 	kfree(tcontext_name);
 	kfree(scontext_name);
-
-	return;
 }
 
 /*
@@ -1452,7 +1450,7 @@ static int string_to_context_struct(struct policydb *pol,
 	/* Parse the security context. */
 
 	rc = -EINVAL;
-	scontextp = (char *) scontext;
+	scontextp = scontext;
 
 	/* Extract the user. */
 	p = scontextp;
@@ -2875,7 +2873,7 @@ out_unlock:
  */
 static inline int __security_genfs_sid(struct selinux_policy *policy,
 				       const char *fstype,
-				       char *path,
+				       const char *path,
 				       u16 orig_sclass,
 				       u32 *sid)
 {
@@ -2928,7 +2926,7 @@ static inline int __security_genfs_sid(struct selinux_policy *policy,
  */
 int security_genfs_sid(struct selinux_state *state,
 		       const char *fstype,
-		       char *path,
+		       const char *path,
 		       u16 orig_sclass,
 		       u32 *sid)
 {
@@ -2952,7 +2950,7 @@ int security_genfs_sid(struct selinux_state *state,
 
 int selinux_policy_genfs_sid(struct selinux_policy *policy,
 			const char *fstype,
-			char *path,
+			const char *path,
 			u16 orig_sclass,
 			u32 *sid)
 {

security/selinux/ss/sidtab.c

@@ -27,8 +27,8 @@ struct sidtab_str_cache {
 	char str[];
 };
 
-#define index_to_sid(index) (index + SECINITSID_NUM + 1)
+#define index_to_sid(index) ((index) + SECINITSID_NUM + 1)
-#define sid_to_index(sid) (sid - (SECINITSID_NUM + 1))
+#define sid_to_index(sid) ((sid) - (SECINITSID_NUM + 1))
 
 int sidtab_init(struct sidtab *s)
 {

security/selinux/xfrm.c

@@ -347,7 +347,7 @@ int selinux_xfrm_state_alloc_acquire(struct xfrm_state *x,
 	int rc;
 	struct xfrm_sec_ctx *ctx;
 	char *ctx_str = NULL;
-	int str_len;
+	u32 str_len;
 
 	if (!polsec)
 		return 0;