selinux/stable-5.19 PR 20220523

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Merge tag 'selinux-pr-20220523' of git://git.kernel.org/pub/scm/linux/kernel/git/pcmoore/selinux

Pull selinux updates from Paul Moore:
 "We've got twelve patches queued for v5.19, with most being fairly
  minor. The highlights are below:

   - The checkreqprot and runtime disable knobs have been deprecated for
     some time with no active users that we can find. In an effort to
     move things along we are adding a pause when the knobs are used to
     help make the deprecation more noticeable in case anyone is still
     using these hacks in the shadows.

   - We've added the anonymous inode class name to the AVC audit records
     when anonymous inodes are involved. This should make writing policy
     easier when anonymous inodes are involved.

   - More constification work. This is fairly straightforward and the
     source of most of the diffstat.

   - The usual minor cleanups: remove unnecessary assignments, assorted
     style/checkpatch fixes, kdoc fixes, macro while-loop
     encapsulations, #include tweaks, etc"

* tag 'selinux-pr-20220523' of git://git.kernel.org/pub/scm/linux/kernel/git/pcmoore/selinux:
  security: declare member holding string literal const
  selinux: log anon inode class name
  selinux: declare data arrays const
  selinux: fix indentation level of mls_ops block
  selinux: include necessary headers in headers
  selinux: avoid extra semicolon
  selinux: update parameter documentation
  selinux: resolve checkpatch errors
  selinux: don't sleep when CONFIG_SECURITY_SELINUX_CHECKREQPROT_VALUE is true
  selinux: checkreqprot is deprecated, add some ssleep() discomfort
  selinux: runtime disable is deprecated, add some ssleep() discomfort
  selinux: Remove redundant assignments

include/linux/lsm_audit.h

@@ -76,6 +76,7 @@ struct common_audit_data {
 #define LSM_AUDIT_DATA_IBENDPORT 14
 #define LSM_AUDIT_DATA_LOCKDOWN 15
 #define LSM_AUDIT_DATA_NOTIFICATION 16
+#define LSM_AUDIT_DATA_ANONINODE	17
 	union 	{
 		struct path path;
 		struct dentry *dentry;
@@ -96,6 +97,7 @@ struct common_audit_data {
 		struct lsm_ibpkey_audit *ibpkey;
 		struct lsm_ibendport_audit *ibendport;
 		int reason;
+		const char *anonclass;
 	} u;
 	/* this union contains LSM specific data */
 	union {

include/linux/lsm_hooks.h

@@ -1595,7 +1595,7 @@ struct security_hook_list {
 	struct hlist_node		list;
 	struct hlist_head		*head;
 	union security_list_options	hook;
-	char				*lsm;
+	const char			*lsm;
 } __randomize_layout;
 
 /*
@@ -1630,7 +1630,7 @@ extern struct security_hook_heads security_hook_heads;
 extern char *lsm_names;
 
 extern void security_add_hooks(struct security_hook_list *hooks, int count,
-				char *lsm);
+				const char *lsm);
 
 #define LSM_FLAG_LEGACY_MAJOR	BIT(0)
 #define LSM_FLAG_EXCLUSIVE	BIT(1)

scripts/selinux/genheaders/genheaders.c

@@ -59,35 +59,27 @@ int main(int argc, char *argv[])
 		exit(2);
 	}
 
-	for (i = 0; secclass_map[i].name; i++) {
-		struct security_class_mapping *map = &secclass_map[i];
-		map->name = stoupperx(map->name);
-		for (j = 0; map->perms[j]; j++)
-			map->perms[j] = stoupperx(map->perms[j]);
-	}
-
-	isids_len = sizeof(initial_sid_to_string) / sizeof (char *);
-	for (i = 1; i < isids_len; i++) {
-		const char *s = initial_sid_to_string[i];
-
-		if (s)
-			initial_sid_to_string[i] = stoupperx(s);
-	}
-
 	fprintf(fout, "/* This file is automatically generated.  Do not edit. */\n");
 	fprintf(fout, "#ifndef _SELINUX_FLASK_H_\n#define _SELINUX_FLASK_H_\n\n");
 
 	for (i = 0; secclass_map[i].name; i++) {
-		struct security_class_mapping *map = &secclass_map[i];
-		fprintf(fout, "#define SECCLASS_%-39s %2d\n", map->name, i+1);
+		char *name = stoupperx(secclass_map[i].name);
+
+		fprintf(fout, "#define SECCLASS_%-39s %2d\n", name, i+1);
+		free(name);
 	}
 
 	fprintf(fout, "\n");
 
+	isids_len = sizeof(initial_sid_to_string) / sizeof(char *);
 	for (i = 1; i < isids_len; i++) {
 		const char *s = initial_sid_to_string[i];
-		if (s)
-			fprintf(fout, "#define SECINITSID_%-39s %2d\n", s, i);
+		if (s) {
+			char *sidname = stoupperx(s);
+
+			fprintf(fout, "#define SECINITSID_%-39s %2d\n", sidname, i);
+			free(sidname);
+		}
 	}
 	fprintf(fout, "\n#define SECINITSID_NUM %d\n", i-1);
 	fprintf(fout, "\nstatic inline bool security_is_socket_class(u16 kern_tclass)\n");
@@ -96,10 +88,14 @@ int main(int argc, char *argv[])
 	fprintf(fout, "\tswitch (kern_tclass) {\n");
 	for (i = 0; secclass_map[i].name; i++) {
 		static char s[] = "SOCKET";
-		struct security_class_mapping *map = &secclass_map[i];
-		int len = strlen(map->name), l = sizeof(s) - 1;
-		if (len >= l && memcmp(map->name + len - l, s, l) == 0)
-			fprintf(fout, "\tcase SECCLASS_%s:\n", map->name);
+		int len, l;
+		char *name = stoupperx(secclass_map[i].name);
+
+		len = strlen(name);
+		l = sizeof(s) - 1;
+		if (len >= l && memcmp(name + len - l, s, l) == 0)
+			fprintf(fout, "\tcase SECCLASS_%s:\n", name);
+		free(name);
 	}
 	fprintf(fout, "\t\tsock = true;\n");
 	fprintf(fout, "\t\tbreak;\n");
@@ -110,33 +106,52 @@ int main(int argc, char *argv[])
 	fprintf(fout, "}\n");
 
 	fprintf(fout, "\n#endif\n");
-	fclose(fout);
+
+	if (fclose(fout) != 0) {
+		fprintf(stderr, "Could not successfully close %s:  %s\n",
+			argv[1], strerror(errno));
+		exit(4);
+	}
 
 	fout = fopen(argv[2], "w");
 	if (!fout) {
 		fprintf(stderr, "Could not open %s for writing:  %s\n",
 			argv[2], strerror(errno));
-		exit(4);
+		exit(5);
 	}
 
 	fprintf(fout, "/* This file is automatically generated.  Do not edit. */\n");
 	fprintf(fout, "#ifndef _SELINUX_AV_PERMISSIONS_H_\n#define _SELINUX_AV_PERMISSIONS_H_\n\n");
 
 	for (i = 0; secclass_map[i].name; i++) {
-		struct security_class_mapping *map = &secclass_map[i];
-		int len = strlen(map->name);
+		const struct security_class_mapping *map = &secclass_map[i];
+		int len;
+		char *name = stoupperx(map->name);
+
+		len = strlen(name);
 		for (j = 0; map->perms[j]; j++) {
+			char *permname;
+
 			if (j >= 32) {
 				fprintf(stderr, "Too many permissions to fit into an access vector at (%s, %s).\n",
 					map->name, map->perms[j]);
 				exit(5);
 			}
-			fprintf(fout, "#define %s__%-*s 0x%08xU\n", map->name,
-				39-len, map->perms[j], 1U<<j);
+			permname = stoupperx(map->perms[j]);
+			fprintf(fout, "#define %s__%-*s 0x%08xU\n", name,
+				39-len, permname, 1U<<j);
+			free(permname);
 		}
+		free(name);
 	}
 
 	fprintf(fout, "\n#endif\n");
-	fclose(fout);
+
+	if (fclose(fout) != 0) {
+		fprintf(stderr, "Could not successfully close %s:  %s\n",
+			argv[2], strerror(errno));
+		exit(6);
+	}
+
 	exit(0);
 }

scripts/selinux/mdp/mdp.c

@@ -82,7 +82,7 @@ int main(int argc, char *argv[])
 
 	/* print out the class permissions */
 	for (i = 0; secclass_map[i].name; i++) {
-		struct security_class_mapping *map = &secclass_map[i];
+		const struct security_class_mapping *map = &secclass_map[i];
 		fprintf(fout, "class %s\n", map->name);
 		fprintf(fout, "{\n");
 		for (j = 0; map->perms[j]; j++)
@@ -103,7 +103,7 @@ int main(int argc, char *argv[])
 #define SYSTEMLOW "s0"
 #define SYSTEMHIGH "s1:c0.c1"
 		for (i = 0; secclass_map[i].name; i++) {
-			struct security_class_mapping *map = &secclass_map[i];
+			const struct security_class_mapping *map = &secclass_map[i];
 
 			fprintf(fout, "mlsconstrain %s {\n", map->name);
 			for (j = 0; map->perms[j]; j++)

security/lsm_audit.c

@@ -433,6 +433,9 @@ static void dump_common_audit_data(struct audit_buffer *ab,
 		audit_log_format(ab, " lockdown_reason=\"%s\"",
 				 lockdown_reasons[a->u.reason]);
 		break;
+	case LSM_AUDIT_DATA_ANONINODE:
+		audit_log_format(ab, " anonclass=%s", a->u.anonclass);
+		break;
 	} /* switch (a->type) */
 }
 

security/security.c

@@ -479,7 +479,7 @@ static int lsm_append(const char *new, char **result)
  * Each LSM has to register its hooks with the infrastructure.
  */
 void __init security_add_hooks(struct security_hook_list *hooks, int count,
-				char *lsm)
+				const char *lsm)
 {
 	int i;
 

security/selinux/avc.c

@@ -668,7 +668,7 @@ static void avc_audit_pre_callback(struct audit_buffer *ab, void *a)
 	struct common_audit_data *ad = a;
 	struct selinux_audit_data *sad = ad->selinux_audit_data;
 	u32 av = sad->audited;
-	const char **perms;
+	const char *const *perms;
 	int i, perm;
 
 	audit_log_format(ab, "avc:  %s ", sad->denied ? "denied" : "granted");
@@ -1059,7 +1059,7 @@ int avc_has_extended_perms(struct selinux_state *state,
 
 	node = avc_lookup(state->avc, ssid, tsid, tclass);
 	if (unlikely(!node)) {
-		node = avc_compute_av(state, ssid, tsid, tclass, &avd, xp_node);
+		avc_compute_av(state, ssid, tsid, tclass, &avd, xp_node);
 	} else {
 		memcpy(&avd, &node->ae.avd, sizeof(avd));
 		xp_node = node->ae.xp_node;
@@ -1151,7 +1151,7 @@ inline int avc_has_perm_noaudit(struct selinux_state *state,
 
 	node = avc_lookup(state->avc, ssid, tsid, tclass);
 	if (unlikely(!node))
-		node = avc_compute_av(state, ssid, tsid, tclass, avd, &xp_node);
+		avc_compute_av(state, ssid, tsid, tclass, avd, &xp_node);
 	else
 		memcpy(avd, &node->ae.avd, sizeof(*avd));
 

security/selinux/hooks.c

@@ -145,7 +145,7 @@ static int __init checkreqprot_setup(char *str)
 	if (!kstrtoul(str, 0, &checkreqprot)) {
 		selinux_checkreqprot_boot = checkreqprot ? 1 : 0;
 		if (checkreqprot)
-			pr_warn("SELinux: checkreqprot set to 1 via kernel parameter.  This is deprecated and will be rejected in a future kernel release.\n");
+			pr_err("SELinux: checkreqprot set to 1 via kernel parameter.  This is deprecated and will be rejected in a future kernel release.\n");
 	}
 	return 1;
 }
@@ -2964,8 +2964,8 @@ static int selinux_inode_init_security_anon(struct inode *inode,
 	 * allowed to actually create this type of anonymous inode.
 	 */
 
-	ad.type = LSM_AUDIT_DATA_INODE;
-	ad.u.inode = inode;
+	ad.type = LSM_AUDIT_DATA_ANONINODE;
+	ad.u.anonclass = name ? (const char *)name->name : "?";
 
 	return avc_has_perm(&selinux_state,
 			    tsec->sid,
@@ -6487,7 +6487,6 @@ static int selinux_setprocattr(const char *name, void *value, size_t size)
 			goto abort_change;
 
 		/* Only allow single threaded processes to change context */
-		error = -EPERM;
 		if (!current_is_single_threaded()) {
 			error = security_bounded_transition(&selinux_state,
 							    tsec->sid, sid);
@@ -7294,6 +7293,8 @@ static __init int selinux_init(void)
 
 	memset(&selinux_state, 0, sizeof(selinux_state));
 	enforcing_set(&selinux_state, selinux_enforcing_boot);
+	if (CONFIG_SECURITY_SELINUX_CHECKREQPROT_VALUE)
+		pr_err("SELinux: CONFIG_SECURITY_SELINUX_CHECKREQPROT_VALUE is non-zero.  This is deprecated and will be rejected in a future kernel release.\n");
 	checkreqprot_set(&selinux_state, selinux_checkreqprot_boot);
 	selinux_avc_init(&selinux_state.avc);
 	mutex_init(&selinux_state.status_lock);

security/selinux/include/audit.h

@@ -12,6 +12,9 @@
 #ifndef _SELINUX_AUDIT_H
 #define _SELINUX_AUDIT_H
 
+#include <linux/audit.h>
+#include <linux/types.h>
+
 /**
  *	selinux_audit_rule_init - alloc/init an selinux audit rule structure.
  *	@field: the field this rule refers to
@@ -51,7 +54,7 @@ int selinux_audit_rule_match(u32 sid, u32 field, u32 op, void *rule);
  *	@rule: rule to be checked
  *	Returns 1 if there are selinux fields specified in the rule, 0 otherwise.
  */
-int selinux_audit_rule_known(struct audit_krule *krule);
+int selinux_audit_rule_known(struct audit_krule *rule);
 
 #endif /* _SELINUX_AUDIT_H */
 

security/selinux/include/avc.h

@@ -104,6 +104,7 @@ int slow_avc_audit(struct selinux_state *state,
 
 /**
  * avc_audit - Audit the granting or denial of permissions.
+ * @state: SELinux state
  * @ssid: source security identifier
  * @tsid: target security identifier
  * @tclass: target security class

security/selinux/include/avc_ss.h

@@ -7,7 +7,7 @@
 #ifndef _SELINUX_AVC_SS_H_
 #define _SELINUX_AVC_SS_H_
 
-#include "flask.h"
+#include <linux/types.h>
 
 struct selinux_avc;
 int avc_ss_reset(struct selinux_avc *avc, u32 seqno);
@@ -18,7 +18,7 @@ struct security_class_mapping {
 	const char *perms[sizeof(u32) * 8 + 1];
 };
 
-extern struct security_class_mapping secclass_map[];
+extern const struct security_class_mapping secclass_map[];
 
 #endif /* _SELINUX_AVC_SS_H_ */
 

security/selinux/include/classmap.h

@@ -38,7 +38,7 @@
  * Note: The name for any socket class should be suffixed by "socket",
  *	 and doesn't contain more than one substr of "socket".
  */
-struct security_class_mapping secclass_map[] = {
+const struct security_class_mapping secclass_map[] = {
 	{ "security",
 	  { "compute_av", "compute_create", "compute_member",
 	    "check_context", "load_policy", "compute_relabel",

security/selinux/include/ibpkey.h

@@ -14,6 +14,8 @@
 #ifndef _SELINUX_IB_PKEY_H
 #define _SELINUX_IB_PKEY_H
 
+#include <linux/types.h>
+
 #ifdef CONFIG_SECURITY_INFINIBAND
 void sel_ib_pkey_flush(void);
 int sel_ib_pkey_sid(u64 subnet_prefix, u16 pkey, u32 *sid);

security/selinux/include/initial_sid_to_string.h

@@ -1,6 +1,5 @@
 /* SPDX-License-Identifier: GPL-2.0 */
-static const char *initial_sid_to_string[] =
-{
+static const char *const initial_sid_to_string[] = {
 	NULL,
 	"kernel",
 	"security",

security/selinux/include/netnode.h

@@ -17,6 +17,8 @@
 #ifndef _SELINUX_NETNODE_H
 #define _SELINUX_NETNODE_H
 
+#include <linux/types.h>
+
 void sel_netnode_flush(void);
 
 int sel_netnode_sid(void *addr, u16 family, u32 *sid);

security/selinux/include/netport.h

@@ -16,6 +16,8 @@
 #ifndef _SELINUX_NETPORT_H
 #define _SELINUX_NETPORT_H
 
+#include <linux/types.h>
+
 void sel_netport_flush(void);
 
 int sel_netport_sid(u8 protocol, u16 pnum, u32 *sid);

security/selinux/include/policycap.h

@@ -16,6 +16,6 @@ enum {
 };
 #define POLICYDB_CAP_MAX (__POLICYDB_CAP_MAX - 1)
 
-extern const char *selinux_policycap_names[__POLICYDB_CAP_MAX];
+extern const char *const selinux_policycap_names[__POLICYDB_CAP_MAX];
 
 #endif /* _SELINUX_POLICYCAP_H_ */

security/selinux/include/policycap_names.h

@@ -5,7 +5,7 @@
 #include "policycap.h"
 
 /* Policy capability names */
-const char *selinux_policycap_names[__POLICYDB_CAP_MAX] = {
+const char *const selinux_policycap_names[__POLICYDB_CAP_MAX] = {
 	"network_peer_controls",
 	"open_perms",
 	"extended_socket_class",

security/selinux/include/security.h

@@ -16,6 +16,8 @@
 #include <linux/rcupdate.h>
 #include <linux/refcount.h>
 #include <linux/workqueue.h>
+#include <linux/delay.h>
+#include <linux/printk.h>
 #include "flask.h"
 #include "policycap.h"
 
@@ -150,6 +152,8 @@ static inline bool checkreqprot_get(const struct selinux_state *state)
 
 static inline void checkreqprot_set(struct selinux_state *state, bool value)
 {
+	if (value)
+		pr_err("SELinux: https://github.com/SELinuxProject/selinux-kernel/wiki/DEPRECATE-checkreqprot\n");
 	WRITE_ONCE(state->checkreqprot, value);
 }
 

security/selinux/include/xfrm.h

@@ -8,7 +8,9 @@
 #ifndef _SELINUX_XFRM_H_
 #define _SELINUX_XFRM_H_
 
+#include <linux/lsm_audit.h>
 #include <net/flow.h>
+#include <net/xfrm.h>
 
 int selinux_xfrm_policy_alloc(struct xfrm_sec_ctx **ctxp,
 			      struct xfrm_user_sec_ctx *uctx,

security/selinux/nlmsgtab.c

@@ -25,8 +25,7 @@ struct nlmsg_perm {
 	u32	perm;
 };
 
-static const struct nlmsg_perm nlmsg_route_perms[] =
-{
+static const struct nlmsg_perm nlmsg_route_perms[] = {
 	{ RTM_NEWLINK,		NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
 	{ RTM_DELLINK,		NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
 	{ RTM_GETLINK,		NETLINK_ROUTE_SOCKET__NLMSG_READ  },
@@ -97,16 +96,14 @@ static const struct nlmsg_perm nlmsg_route_perms[] =
 	{ RTM_GETTUNNEL,	NETLINK_ROUTE_SOCKET__NLMSG_READ  },
 };
 
-static const struct nlmsg_perm nlmsg_tcpdiag_perms[] =
-{
+static const struct nlmsg_perm nlmsg_tcpdiag_perms[] = {
 	{ TCPDIAG_GETSOCK,	NETLINK_TCPDIAG_SOCKET__NLMSG_READ },
 	{ DCCPDIAG_GETSOCK,	NETLINK_TCPDIAG_SOCKET__NLMSG_READ },
 	{ SOCK_DIAG_BY_FAMILY,	NETLINK_TCPDIAG_SOCKET__NLMSG_READ },
 	{ SOCK_DESTROY,		NETLINK_TCPDIAG_SOCKET__NLMSG_WRITE },
 };
 
-static const struct nlmsg_perm nlmsg_xfrm_perms[] =
-{
+static const struct nlmsg_perm nlmsg_xfrm_perms[] = {
 	{ XFRM_MSG_NEWSA,	NETLINK_XFRM_SOCKET__NLMSG_WRITE },
 	{ XFRM_MSG_DELSA,	NETLINK_XFRM_SOCKET__NLMSG_WRITE },
 	{ XFRM_MSG_GETSA,	NETLINK_XFRM_SOCKET__NLMSG_READ  },
@@ -134,8 +131,7 @@ static const struct nlmsg_perm nlmsg_xfrm_perms[] =
 	{ XFRM_MSG_GETDEFAULT,	NETLINK_XFRM_SOCKET__NLMSG_READ  },
 };
 
-static const struct nlmsg_perm nlmsg_audit_perms[] =
-{
+static const struct nlmsg_perm nlmsg_audit_perms[] = {
 	{ AUDIT_GET,		NETLINK_AUDIT_SOCKET__NLMSG_READ     },
 	{ AUDIT_SET,		NETLINK_AUDIT_SOCKET__NLMSG_WRITE    },
 	{ AUDIT_LIST,		NETLINK_AUDIT_SOCKET__NLMSG_READPRIV },

security/selinux/selinuxfs.c

@@ -293,6 +293,8 @@ static ssize_t sel_write_disable(struct file *file, const char __user *buf,
 	 *       kernel releases until eventually it is removed
 	 */
 	pr_err("SELinux:  Runtime disable is deprecated, use selinux=0 on the kernel cmdline.\n");
+	pr_err("SELinux:  https://github.com/SELinuxProject/selinux-kernel/wiki/DEPRECATE-runtime-disable\n");
+	ssleep(5);
 
 	if (count >= PAGE_SIZE)
 		return -ENOMEM;
@@ -755,11 +757,13 @@ static ssize_t sel_write_checkreqprot(struct file *file, const char __user *buf,
 		char comm[sizeof(current->comm)];
 
 		memcpy(comm, current->comm, sizeof(comm));
-		pr_warn_once("SELinux: %s (%d) set checkreqprot to 1. This is deprecated and will be rejected in a future kernel release.\n",
-			     comm, current->pid);
+		pr_err("SELinux: %s (%d) set checkreqprot to 1. This is deprecated and will be rejected in a future kernel release.\n",
+		       comm, current->pid);
 	}
 
 	checkreqprot_set(fsi->state, (new_value ? 1 : 0));
+	if (new_value)
+		ssleep(5);
 	length = count;
 
 	selinux_ima_measure_state(fsi->state);

security/selinux/ss/avtab.c

@@ -40,15 +40,15 @@ static inline int avtab_hash(const struct avtab_key *keyp, u32 mask)
 
 	u32 hash = 0;
 
-#define mix(input) { \
-	u32 v = input; \
-	v *= c1; \
-	v = (v << r1) | (v >> (32 - r1)); \
-	v *= c2; \
-	hash ^= v; \
-	hash = (hash << r2) | (hash >> (32 - r2)); \
-	hash = hash * m + n; \
-}
+#define mix(input) do { \
+		u32 v = input; \
+		v *= c1; \
+		v = (v << r1) | (v >> (32 - r1)); \
+		v *= c2; \
+		hash ^= v; \
+		hash = (hash << r2) | (hash >> (32 - r2)); \
+		hash = hash * m + n; \
+	} while (0)
 
 	mix(keyp->target_class);
 	mix(keyp->target_type);
@@ -385,7 +385,7 @@ void avtab_hash_eval(struct avtab *h, char *tag)
 	       chain2_len_sum);
 }
 
-static uint16_t spec_order[] = {
+static const uint16_t spec_order[] = {
 	AVTAB_ALLOWED,
 	AVTAB_AUDITDENY,
 	AVTAB_AUDITALLOW,

security/selinux/ss/policydb.c

@@ -61,7 +61,7 @@ struct policydb_compat_info {
 };
 
 /* These need to be updated if SYM_NUM or OCON_NUM changes */
-static struct policydb_compat_info policydb_compat[] = {
+static const struct policydb_compat_info policydb_compat[] = {
 	{
 		.version	= POLICYDB_VERSION_BASE,
 		.sym_num	= SYM_NUM - 3,
@@ -159,18 +159,16 @@ static struct policydb_compat_info policydb_compat[] = {
 	},
 };
 
-static struct policydb_compat_info *policydb_lookup_compat(int version)
+static const struct policydb_compat_info *policydb_lookup_compat(int version)
 {
 	int i;
-	struct policydb_compat_info *info = NULL;
 
 	for (i = 0; i < ARRAY_SIZE(policydb_compat); i++) {
-		if (policydb_compat[i].version == version) {
-			info = &policydb_compat[i];
-			break;
-		}
+		if (policydb_compat[i].version == version)
+			return &policydb_compat[i];
 	}
-	return info;
+
+	return NULL;
 }
 
 /*
@@ -314,8 +312,7 @@ static int cat_destroy(void *key, void *datum, void *p)
 	return 0;
 }
 
-static int (*destroy_f[SYM_NUM]) (void *key, void *datum, void *datap) =
-{
+static int (*const destroy_f[SYM_NUM]) (void *key, void *datum, void *datap) = {
 	common_destroy,
 	cls_destroy,
 	role_destroy,
@@ -670,8 +667,7 @@ static int cat_index(void *key, void *datum, void *datap)
 	return 0;
 }
 
-static int (*index_f[SYM_NUM]) (void *key, void *datum, void *datap) =
-{
+static int (*const index_f[SYM_NUM]) (void *key, void *datum, void *datap) = {
 	common_index,
 	class_index,
 	role_index,
@@ -1639,8 +1635,8 @@ bad:
 	return rc;
 }
 
-static int (*read_f[SYM_NUM]) (struct policydb *p, struct symtab *s, void *fp) =
-{
+static int (*const read_f[SYM_NUM]) (struct policydb *p,
+				     struct symtab *s, void *fp) = {
 	common_read,
 	class_read,
 	role_read,
@@ -2211,7 +2207,7 @@ out:
 	return rc;
 }
 
-static int ocontext_read(struct policydb *p, struct policydb_compat_info *info,
+static int ocontext_read(struct policydb *p, const struct policydb_compat_info *info,
 			 void *fp)
 {
 	int i, j, rc;
@@ -2407,7 +2403,7 @@ int policydb_read(struct policydb *p, void *fp)
 	u32 len, nprim, nel, perm;
 
 	char *policydb_str;
-	struct policydb_compat_info *info;
+	const struct policydb_compat_info *info;
 
 	policydb_init(p);
 
@@ -3241,9 +3237,7 @@ static int user_write(void *vkey, void *datum, void *ptr)
 	return 0;
 }
 
-static int (*write_f[SYM_NUM]) (void *key, void *datum,
-				void *datap) =
-{
+static int (*const write_f[SYM_NUM]) (void *key, void *datum, void *datap) = {
 	common_write,
 	class_write,
 	role_write,
@@ -3254,7 +3248,7 @@ static int (*write_f[SYM_NUM]) (void *key, void *datum,
 	cat_write,
 };
 
-static int ocontext_write(struct policydb *p, struct policydb_compat_info *info,
+static int ocontext_write(struct policydb *p, const struct policydb_compat_info *info,
 			  void *fp)
 {
 	unsigned int i, j, rc;
@@ -3611,7 +3605,7 @@ int policydb_write(struct policydb *p, void *fp)
 	__le32 buf[4];
 	u32 config;
 	size_t len;
-	struct policydb_compat_info *info;
+	const struct policydb_compat_info *info;
 
 	/*
 	 * refuse to write policy older than compressed avtab

security/selinux/ss/services.c

@@ -99,7 +99,7 @@ static void context_struct_compute_av(struct policydb *policydb,
 				      struct extended_perms *xperms);
 
 static int selinux_set_mapping(struct policydb *pol,
-			       struct security_class_mapping *map,
+			       const struct security_class_mapping *map,
 			       struct selinux_map *out_map)
 {
 	u16 i, j;
@@ -121,7 +121,7 @@ static int selinux_set_mapping(struct policydb *pol,
 	/* Store the raw class and permission values */
 	j = 0;
 	while (map[j].name) {
-		struct security_class_mapping *p_in = map + (j++);
+		const struct security_class_mapping *p_in = map + (j++);
 		struct selinux_mapping *p_out = out_map->mapping + j;
 
 		/* An empty class string skips ahead */
@@ -358,27 +358,27 @@ static int constraint_expr_eval(struct policydb *policydb,
 				l2 = &(tcontext->range.level[1]);
 				goto mls_ops;
 mls_ops:
-			switch (e->op) {
-			case CEXPR_EQ:
-				s[++sp] = mls_level_eq(l1, l2);
-				continue;
-			case CEXPR_NEQ:
-				s[++sp] = !mls_level_eq(l1, l2);
-				continue;
-			case CEXPR_DOM:
-				s[++sp] = mls_level_dom(l1, l2);
-				continue;
-			case CEXPR_DOMBY:
-				s[++sp] = mls_level_dom(l2, l1);
-				continue;
-			case CEXPR_INCOMP:
-				s[++sp] = mls_level_incomp(l2, l1);
-				continue;
-			default:
-				BUG();
-				return 0;
-			}
-			break;
+				switch (e->op) {
+				case CEXPR_EQ:
+					s[++sp] = mls_level_eq(l1, l2);
+					continue;
+				case CEXPR_NEQ:
+					s[++sp] = !mls_level_eq(l1, l2);
+					continue;
+				case CEXPR_DOM:
+					s[++sp] = mls_level_dom(l1, l2);
+					continue;
+				case CEXPR_DOMBY:
+					s[++sp] = mls_level_dom(l2, l1);
+					continue;
+				case CEXPR_INCOMP:
+					s[++sp] = mls_level_incomp(l2, l1);
+					continue;
+				default:
+					BUG();
+					return 0;
+				}
+				break;
 			default:
 				BUG();
 				return 0;
@@ -2980,7 +2980,6 @@ int security_fs_use(struct selinux_state *state, struct super_block *sb)
 	}
 
 retry:
-	rc = 0;
 	rcu_read_lock();
 	policy = rcu_dereference(state->policy);
 	policydb = &policy->policydb;