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

Author: torvalds

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