Now, let's find selinux_enabled is set as 1 or 0.
#ifdef CONFIG_SECURITY_SELINUX_BOOTPARAM
int selinux_enabled = CONFIG_SECURITY_SELINUX_BOOTPARAM_VALUE;
static int __init selinux_enabled_setup(char *str)
{
unsigned long enabled;
if (!kstrtoul(str, 0, &enabled))
selinux_enabled = enabled ? 1 : 0;
return 1;
}
__setup("selinux=", selinux_enabled_setup);
#else
int selinux_enabled = 1;
#endif
If the boot argument includes "selinux=", selinux_enabled is set to 1 inside selinux_enabled_setup().
But above code snippset is based on 4.19 kernel version.
With v5.12 version, selinux_enabled is changed as selinux_enabled_boot.
int selinux_enabled_boot __initdata = 1;
#ifdef CONFIG_SECURITY_SELINUX_BOOTPARAM
static int __init selinux_enabled_setup(char *str)
{
unsigned long enabled;
if (!kstrtoul(str, 0, &enabled))
selinux_enabled_boot = enabled ? 1 : 0;
return 1;
}
__setup("selinux=", selinux_enabled_setup);
#endif
Above change seems to come from below commit;
diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index 40ec866e48daa..659c4a81e8976 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -109,7 +109,7 @@ struct selinux_state selinux_state;
static atomic_t selinux_secmark_refcount = ATOMIC_INIT(0);
#ifdef CONFIG_SECURITY_SELINUX_DEVELOP
-static int selinux_enforcing_boot;
+static int selinux_enforcing_boot __initdata;
static int __init enforcing_setup(char *str)
{
@@ -123,13 +123,13 @@ __setup("enforcing=", enforcing_setup);
#define selinux_enforcing_boot 1
#endif
-int selinux_enabled __lsm_ro_after_init = 1;
+int selinux_enabled_boot __initdata = 1;
#ifdef CONFIG_SECURITY_SELINUX_BOOTPARAM
static int __init selinux_enabled_setup(char *str)
{
unsigned long enabled;
if (!kstrtoul(str, 0, &enabled))
- selinux_enabled = enabled ? 1 : 0;
+ selinux_enabled_boot = enabled ? 1 : 0;
return 1;
}
__setup("selinux=", selinux_enabled_setup);
@@ -7202,7 +7202,7 @@ void selinux_complete_init(void)
DEFINE_LSM(selinux) = {
.name = "selinux",
.flags = LSM_FLAG_LEGACY_MAJOR | LSM_FLAG_EXCLUSIVE,
- .enabled = &selinux_enabled,
+ .enabled = &selinux_enabled_boot,
.blobs = &selinux_blob_sizes,
.init = selinux_init,
};
@@ -7271,7 +7271,7 @@ static int __init selinux_nf_ip_init(void)
{
int err;
- if (!selinux_enabled)
+ if (!selinux_enabled_boot)
return 0;
pr_debug("SELinux: Registering netfilter hooks\n");
@@ -7318,8 +7318,6 @@ int selinux_disable(struct selinux_state *state)
pr_info("SELinux: Disabled at runtime.\n");
- selinux_enabled = 0;
-
security_delete_hooks(selinux_hooks, ARRAY_SIZE(selinux_hooks));
/* Try to destroy the avc node cache */
diff --git a/security/selinux/ibpkey.c b/security/selinux/ibpkey.c
index de92365e4324b..f68a7617cfb95 100644
--- a/security/selinux/ibpkey.c
+++ b/security/selinux/ibpkey.c
@@ -222,7 +222,7 @@ static __init int sel_ib_pkey_init(void)
{
int iter;
- if (!selinux_enabled)
+ if (!selinux_enabled_boot)
return 0;
for (iter = 0; iter < SEL_PKEY_HASH_SIZE; iter++) {
diff --git a/security/selinux/include/security.h b/security/selinux/include/security.h
index 8c0dbbd076c6f..af623f03922ce 100644
--- a/security/selinux/include/security.h
+++ b/security/selinux/include/security.h
@@ -69,7 +69,7 @@
struct netlbl_lsm_secattr;
-extern int selinux_enabled;
+extern int selinux_enabled_boot;
/* Policy capabilities */
enum {
@@ -99,7 +99,9 @@ struct selinux_avc;
struct selinux_ss;
struct selinux_state {
+#ifdef CONFIG_SECURITY_SELINUX_DISABLE
bool disabled;
+#endif
#ifdef CONFIG_SECURITY_SELINUX_DEVELOP
bool enforcing;
#endif
diff --git a/security/selinux/netif.c b/security/selinux/netif.c
index e40fecd737524..15b8c1bcd7d0c 100644
--- a/security/selinux/netif.c
+++ b/security/selinux/netif.c
@@ -266,7 +266,7 @@ static __init int sel_netif_init(void)
{
int i;
- if (!selinux_enabled)
+ if (!selinux_enabled_boot)
return 0;
for (i = 0; i < SEL_NETIF_HASH_SIZE; i++)
diff --git a/security/selinux/netnode.c b/security/selinux/netnode.c
index 9ab84efa46c7e..dff587d1e1641 100644
--- a/security/selinux/netnode.c
+++ b/security/selinux/netnode.c
@@ -291,7 +291,7 @@ static __init int sel_netnode_init(void)
{
int iter;
- if (!selinux_enabled)
+ if (!selinux_enabled_boot)
return 0;
for (iter = 0; iter < SEL_NETNODE_HASH_SIZE; iter++) {
diff --git a/security/selinux/netport.c b/security/selinux/netport.c
index 3f8b2c0458c88..de727f7489b76 100644
--- a/security/selinux/netport.c
+++ b/security/selinux/netport.c
@@ -225,7 +225,7 @@ static __init int sel_netport_init(void)
{
int iter;
- if (!selinux_enabled)
+ if (!selinux_enabled_boot)
return 0;
for (iter = 0; iter < SEL_NETPORT_HASH_SIZE; iter++) {
diff --git a/security/selinux/selinuxfs.c b/security/selinux/selinuxfs.c
index dd7bb1f1dc99a..278417e67b4c6 100644
--- a/security/selinux/selinuxfs.c
+++ b/security/selinux/selinuxfs.c
@@ -168,11 +168,10 @@ static ssize_t sel_write_enforce(struct file *file, const char __user *buf,
goto out;
audit_log(audit_context(), GFP_KERNEL, AUDIT_MAC_STATUS,
"enforcing=%d old_enforcing=%d auid=%u ses=%u"
- " enabled=%d old-enabled=%d lsm=selinux res=1",
+ " enabled=1 old-enabled=1 lsm=selinux res=1",
new_value, old_value,
from_kuid(&init_user_ns, audit_get_loginuid(current)),
- audit_get_sessionid(current),
- selinux_enabled, selinux_enabled);
+ audit_get_sessionid(current));
enforcing_set(state, new_value);
if (new_value)
avc_ss_reset(state->avc, 0);
@@ -304,10 +303,10 @@ static ssize_t sel_write_disable(struct file *file, const char __user *buf,
goto out;
audit_log(audit_context(), GFP_KERNEL, AUDIT_MAC_STATUS,
"enforcing=%d old_enforcing=%d auid=%u ses=%u"
- " enabled=%d old-enabled=%d lsm=selinux res=1",
+ " enabled=0 old-enabled=1 lsm=selinux res=1",
enforcing, enforcing,
from_kuid(&init_user_ns, audit_get_loginuid(current)),
- audit_get_sessionid(current), 0, 1);
+ audit_get_sessionid(current));
}
length = count;
@@ -2105,7 +2104,7 @@ static int __init init_sel_fs(void)
sizeof(NULL_FILE_NAME)-1);
int err;
- if (!selinux_enabled)
+ if (!selinux_enabled_boot)
return 0;
err = sysfs_create_mount_point(fs_kobj, "selinux");
This patch contains very informative code, which make me know where selinux_enabled is configured.
