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platform_system_core
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init: allow disabling selinux via a kernel command line 

Create a new "androidboot.selinux" option, to control how userspace
handles SELinux. This kernel command line can have three options:

* disabled
* permissive
* enforcing

"disabled" completely disables userspace support for SELinux. No
policy is ever loaded, nor is the SELinux filesystem /sys/fs/selinux
ever mounted.

"permissive" loads the SELinux policy, but puts SELinux into
permissive mode. SELinux policy violations are logged, but not rejected.

"enforcing", the default, loads the SELinux policy, and places
SELinux into enforcing mode. Policy violations are rejected.

This change addresses post review comments for change
b710ed21de .

Change-Id: I912583db8e6a0e9c63380de32ad8ffc47a8a440f
This commit is contained in:
Nick Kralevich 2013-06-26 15:37:26 -07:00
parent eecf40fce8
commit 4838aa1b7b
1 changed files with 48 additions and 3 deletions
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51
init/init.c
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@ -793,8 +793,52 @@ void selinux_init_all_handles(void)
sehandle_prop = selinux_android_prop_context_handle();
}
static bool selinux_is_disabled(void)
{
char tmp[PROP_VALUE_MAX];
if (access("/sys/fs/selinux", F_OK) != 0) {
/* SELinux is not compiled into the kernel, or has been disabled
* via the kernel command line "selinux=0".
*/
return true;
}
if ((property_get("ro.boot.selinux", tmp) != 0) && (strcmp(tmp, "disabled") == 0)) {
/* SELinux is compiled into the kernel, but we've been told to disable it. */
return true;
}
return false;
}
static bool selinux_is_enforcing(void)
{
char tmp[PROP_VALUE_MAX];
if (property_get("ro.boot.selinux", tmp) == 0) {
/* Property is not set. Assume enforcing */
return true;
}
if (strcmp(tmp, "permissive") == 0) {
/* SELinux is in the kernel, but we've been told to go into permissive mode */
return false;
}
if (strcmp(tmp, "enforcing") != 0) {
ERROR("SELinux: Unknown value of ro.boot.selinux. Got: \"%s\". Assuming enforcing.\n", tmp);
}
return true;
}
int selinux_reload_policy(void)
{
if (selinux_is_disabled()) {
return -1;
}
INFO("SELinux: Attempting to reload policy files\n");
if (selinux_android_reload_policy() == -1) {
@ -819,8 +863,7 @@ int audit_callback(void *data, security_class_t cls, char *buf, size_t len)
static void selinux_initialize(void)
{
if (access("/sys/fs/selinux", F_OK) != 0) {
// SELinux is not compiled into this kernel. Fail gracefully.
if (selinux_is_disabled()) {
return;
}
@ -832,7 +875,9 @@ static void selinux_initialize(void)
}
selinux_init_all_handles();
security_setenforce(1);
bool is_enforcing = selinux_is_enforcing();
INFO("SELinux: security_setenforce(%d)\n", is_enforcing);
security_setenforce(is_enforcing);
}
int main(int argc, char **argv)