selinux: allow MLS->non-MLS and vice versa upon policy reload
Allow runtime switching between different policy types (e.g. from a MLS/MCS
policy to a non-MLS/non-MCS policy or viceversa).
Signed-off-by: Guido Trentalancia <guido@trentalancia.com>
Acked-by: Stephen Smalley <sds@tycho.nsa.gov>
Signed-off-by: James Morris <jmorris@namei.org>
diff --git a/security/selinux/ss/policydb.c b/security/selinux/ss/policydb.c
index 5b92c02..23c6e53 100644
--- a/security/selinux/ss/policydb.c
+++ b/security/selinux/ss/policydb.c
@@ -52,8 +52,6 @@
};
#endif
-int selinux_mls_enabled;
-
static unsigned int symtab_sizes[SYM_NUM] = {
2,
32,
@@ -455,7 +453,7 @@
printk(KERN_DEBUG "SELinux: %d users, %d roles, %d types, %d bools",
p->p_users.nprim, p->p_roles.nprim, p->p_types.nprim, p->p_bools.nprim);
- if (selinux_mls_enabled)
+ if (p->mls_enabled)
printk(", %d sens, %d cats", p->p_levels.nprim,
p->p_cats.nprim);
printk("\n");
@@ -1717,14 +1715,12 @@
int i, j, rc;
__le32 buf[4];
u32 nodebuf[8];
- u32 len, len2, config, nprim, nel, nel2;
+ u32 len, len2, nprim, nel, nel2;
char *policydb_str;
struct policydb_compat_info *info;
struct range_trans *rt;
struct mls_range *r;
- config = 0;
-
rc = policydb_init(p);
if (rc)
goto out;
@@ -1772,7 +1768,7 @@
kfree(policydb_str);
policydb_str = NULL;
- /* Read the version, config, and table sizes. */
+ /* Read the version and table sizes. */
rc = next_entry(buf, fp, sizeof(u32)*4);
if (rc < 0)
goto bad;
@@ -1787,13 +1783,7 @@
}
if ((le32_to_cpu(buf[1]) & POLICYDB_CONFIG_MLS)) {
- if (ss_initialized && !selinux_mls_enabled) {
- printk(KERN_ERR "SELinux: Cannot switch between non-MLS"
- " and MLS policies\n");
- goto bad;
- }
- selinux_mls_enabled = 1;
- config |= POLICYDB_CONFIG_MLS;
+ p->mls_enabled = 1;
if (p->policyvers < POLICYDB_VERSION_MLS) {
printk(KERN_ERR "SELinux: security policydb version %d "
@@ -1801,12 +1791,6 @@
p->policyvers);
goto bad;
}
- } else {
- if (ss_initialized && selinux_mls_enabled) {
- printk(KERN_ERR "SELinux: Cannot switch between MLS and"
- " non-MLS policies\n");
- goto bad;
- }
}
p->reject_unknown = !!(le32_to_cpu(buf[1]) & REJECT_UNKNOWN);
p->allow_unknown = !!(le32_to_cpu(buf[1]) & ALLOW_UNKNOWN);