selinux: declare data arrays const

The arrays for the policy capability names, the initial sid identifiers
and the class and permission names are not changed at runtime.  Declare
them const to avoid accidental modification.

Do not override the classmap and the initial sid list in the build time
script genheaders.

Check flose(3) is successful in genheaders.c, otherwise the written data
might be corrupted or incomplete.

Signed-off-by: Christian Göttsche <cgzones@googlemail.com>
[PM: manual merge due to fuzz, minor style tweaks]
Signed-off-by: Paul Moore <paul@paul-moore.com>

1 files changed, 15 insertions, 17 deletions

diff --git a/security/selinux/ss/policydb.c b/security/selinux/ss/policydb.c
index 3d50dfb0211b..adcfb63b3550 100644
--- a/security/selinux/ss/policydb.c
+++ b/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;
 }
 
 /*
@@ -314,7 +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,
@@ -669,7 +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,
@@ -1637,7 +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,
@@ -2208,7 +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;
@@ -2404,7 +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);
 
@@ -3238,8 +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,
@@ -3250,7 +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;
@@ -3607,7 +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