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-rw-r--r--security/yama/Kconfig8
-rw-r--r--security/yama/yama_lsm.c16
2 files changed, 19 insertions, 5 deletions
diff --git a/security/yama/Kconfig b/security/yama/Kconfig
index 51d6709d8bbd..20ef5143c0c0 100644
--- a/security/yama/Kconfig
+++ b/security/yama/Kconfig
@@ -11,3 +11,11 @@ config SECURITY_YAMA
Further information can be found in Documentation/security/Yama.txt.
If you are unsure how to answer this question, answer N.
+
+config SECURITY_YAMA_STACKED
+ bool "Yama stacked with other LSMs"
+ depends on SECURITY_YAMA
+ default n
+ help
+ When Yama is built into the kernel, force it to stack with the
+ selected primary LSM.
diff --git a/security/yama/yama_lsm.c b/security/yama/yama_lsm.c
index 0cc99a3ea42d..b4c29848b49d 100644
--- a/security/yama/yama_lsm.c
+++ b/security/yama/yama_lsm.c
@@ -100,7 +100,7 @@ static void yama_ptracer_del(struct task_struct *tracer,
* yama_task_free - check for task_pid to remove from exception list
* @task: task being removed
*/
-static void yama_task_free(struct task_struct *task)
+void yama_task_free(struct task_struct *task)
{
yama_ptracer_del(task, task);
}
@@ -116,7 +116,7 @@ static void yama_task_free(struct task_struct *task)
* Return 0 on success, -ve on error. -ENOSYS is returned when Yama
* does not handle the given option.
*/
-static int yama_task_prctl(int option, unsigned long arg2, unsigned long arg3,
+int yama_task_prctl(int option, unsigned long arg2, unsigned long arg3,
unsigned long arg4, unsigned long arg5)
{
int rc;
@@ -143,7 +143,7 @@ static int yama_task_prctl(int option, unsigned long arg2, unsigned long arg3,
if (arg2 == 0) {
yama_ptracer_del(NULL, myself);
rc = 0;
- } else if (arg2 == PR_SET_PTRACER_ANY) {
+ } else if (arg2 == PR_SET_PTRACER_ANY || (int)arg2 == -1) {
rc = yama_ptracer_add(NULL, myself);
} else {
struct task_struct *tracer;
@@ -243,7 +243,7 @@ static int ptracer_exception_found(struct task_struct *tracer,
*
* Returns 0 if following the ptrace is allowed, -ve on error.
*/
-static int yama_ptrace_access_check(struct task_struct *child,
+int yama_ptrace_access_check(struct task_struct *child,
unsigned int mode)
{
int rc;
@@ -293,7 +293,7 @@ static int yama_ptrace_access_check(struct task_struct *child,
*
* Returns 0 if following the ptrace is allowed, -ve on error.
*/
-static int yama_ptrace_traceme(struct task_struct *parent)
+int yama_ptrace_traceme(struct task_struct *parent)
{
int rc;
@@ -324,6 +324,7 @@ static int yama_ptrace_traceme(struct task_struct *parent)
return rc;
}
+#ifndef CONFIG_SECURITY_YAMA_STACKED
static struct security_operations yama_ops = {
.name = "yama",
@@ -332,6 +333,7 @@ static struct security_operations yama_ops = {
.task_prctl = yama_task_prctl,
.task_free = yama_task_free,
};
+#endif
#ifdef CONFIG_SYSCTL
static int yama_dointvec_minmax(struct ctl_table *table, int write,
@@ -378,13 +380,17 @@ static struct ctl_table yama_sysctl_table[] = {
static __init int yama_init(void)
{
+#ifndef CONFIG_SECURITY_YAMA_STACKED
if (!security_module_enable(&yama_ops))
return 0;
+#endif
printk(KERN_INFO "Yama: becoming mindful.\n");
+#ifndef CONFIG_SECURITY_YAMA_STACKED
if (register_security(&yama_ops))
panic("Yama: kernel registration failed.\n");
+#endif
#ifdef CONFIG_SYSCTL
if (!register_sysctl_paths(yama_sysctl_path, yama_sysctl_table))