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-rw-r--r--security/yama/yama_lsm.c50
1 files changed, 15 insertions, 35 deletions
diff --git a/security/yama/yama_lsm.c b/security/yama/yama_lsm.c
index 23dd4c6..9ed3250 100644
--- a/security/yama/yama_lsm.c
+++ b/security/yama/yama_lsm.c
@@ -154,13 +154,9 @@ void yama_task_free(struct task_struct *task)
int yama_task_prctl(int option, unsigned long arg2, unsigned long arg3,
unsigned long arg4, unsigned long arg5)
{
- int rc;
+ int rc = -ENOSYS;
struct task_struct *myself = current;
- rc = cap_task_prctl(option, arg2, arg3, arg4, arg5);
- if (rc != -ENOSYS)
- return rc;
-
switch (option) {
case PR_SET_PTRACER:
/* Since a thread can call prctl(), find the group leader
@@ -279,17 +275,10 @@ static int ptracer_exception_found(struct task_struct *tracer,
*
* Returns 0 if following the ptrace is allowed, -ve on error.
*/
-int yama_ptrace_access_check(struct task_struct *child,
+static int yama_ptrace_access_check(struct task_struct *child,
unsigned int mode)
{
- int rc;
-
- /* If standard caps disallows it, so does Yama. We should
- * only tighten restrictions further.
- */
- rc = cap_ptrace_access_check(child, mode);
- if (rc)
- return rc;
+ int rc = 0;
/* require ptrace target be a child of ptracer on attach */
if (mode == PTRACE_MODE_ATTACH) {
@@ -335,14 +324,7 @@ int yama_ptrace_access_check(struct task_struct *child,
*/
int yama_ptrace_traceme(struct task_struct *parent)
{
- int rc;
-
- /* If standard caps disallows it, so does Yama. We should
- * only tighten restrictions further.
- */
- rc = cap_ptrace_traceme(parent);
- if (rc)
- return rc;
+ int rc = 0;
/* Only disallow PTRACE_TRACEME on more aggressive settings. */
switch (ptrace_scope) {
@@ -364,16 +346,17 @@ int yama_ptrace_traceme(struct task_struct *parent)
return rc;
}
-#ifndef CONFIG_SECURITY_YAMA_STACKED
-static struct security_operations yama_ops = {
- LSM_HOOK_INIT(name, "yama"),
-
+static struct security_hook_list yama_hooks[] = {
LSM_HOOK_INIT(ptrace_access_check, yama_ptrace_access_check),
LSM_HOOK_INIT(ptrace_traceme, yama_ptrace_traceme),
LSM_HOOK_INIT(task_prctl, yama_task_prctl),
LSM_HOOK_INIT(task_free, yama_task_free),
};
-#endif
+
+void __init yama_add_hooks(void)
+{
+ security_add_hooks(yama_hooks, ARRAY_SIZE(yama_hooks));
+}
#ifdef CONFIG_SYSCTL
static int yama_dointvec_minmax(struct ctl_table *table, int write,
@@ -418,16 +401,13 @@ static struct ctl_table yama_sysctl_table[] = {
static __init int yama_init(void)
{
#ifndef CONFIG_SECURITY_YAMA_STACKED
- if (!security_module_enable(&yama_ops))
+ /*
+ * If yama is being stacked this is already taken care of.
+ */
+ if (!security_module_enable("yama"))
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
+ pr_info("Yama: becoming mindful.\n");
#ifdef CONFIG_SYSCTL
if (!register_sysctl_paths(yama_sysctl_path, yama_sysctl_table))
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