---

yaml --- r: 329099 b: refs/heads/master c: c6993e4 h: refs/heads/master i: 329097: 042eb72 329095: 4902986 v: v3
git-mirror · Sep 5, 2012 · b7feba3 · b7feba3
1 parent a8ead46
commit b7feba3
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Showing 5 changed files with 71 additions and 5 deletions.
diff --git a/[refs] b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 81198078d7da4240f3cbfc2c6a8ea6cd417f51a7
+refs/heads/master: c6993e4ac002c92bc75379212e9179c36d4bf7ee
diff --git a/trunk/include/linux/security.h b/trunk/include/linux/security.h
@@ -3021,5 +3021,36 @@ static inline void free_secdata(void *secdata)
 { }
 #endif /* CONFIG_SECURITY */
 
+#ifdef CONFIG_SECURITY_YAMA
+extern int yama_ptrace_access_check(struct task_struct *child,
+				    unsigned int mode);
+extern int yama_ptrace_traceme(struct task_struct *parent);
+extern void yama_task_free(struct task_struct *task);
+extern int yama_task_prctl(int option, unsigned long arg2, unsigned long arg3,
+			   unsigned long arg4, unsigned long arg5);
+#else
+static inline int yama_ptrace_access_check(struct task_struct *child,
+					   unsigned int mode)
+{
+	return 0;
+}
+
+static inline int yama_ptrace_traceme(struct task_struct *parent)
+{
+	return 0;
+}
+
+static inline void yama_task_free(struct task_struct *task)
+{
+}
+
+static inline int yama_task_prctl(int option, unsigned long arg2,
+				  unsigned long arg3, unsigned long arg4,
+				  unsigned long arg5)
+{
+	return -ENOSYS;
+}
+#endif /* CONFIG_SECURITY_YAMA */
+
 #endif /* ! __LINUX_SECURITY_H */
 
diff --git a/trunk/security/security.c b/trunk/security/security.c
@@ -136,11 +136,23 @@ int __init register_security(struct security_operations *ops)
 
 int security_ptrace_access_check(struct task_struct *child, unsigned int mode)
 {
+#ifdef CONFIG_SECURITY_YAMA_STACKED
+	int rc;
+	rc = yama_ptrace_access_check(child, mode);
+	if (rc)
+		return rc;
+#endif
 	return security_ops->ptrace_access_check(child, mode);
 }
 
 int security_ptrace_traceme(struct task_struct *parent)
 {
+#ifdef CONFIG_SECURITY_YAMA_STACKED
+	int rc;
+	rc = yama_ptrace_traceme(parent);
+	if (rc)
+		return rc;
+#endif
 	return security_ops->ptrace_traceme(parent);
 }
 
@@ -761,6 +773,9 @@ int security_task_create(unsigned long clone_flags)
 
 void security_task_free(struct task_struct *task)
 {
+#ifdef CONFIG_SECURITY_YAMA_STACKED
+	yama_task_free(task);
+#endif
 	security_ops->task_free(task);
 }
 
@@ -876,6 +891,12 @@ int security_task_wait(struct task_struct *p)
 int security_task_prctl(int option, unsigned long arg2, unsigned long arg3,
 			 unsigned long arg4, unsigned long arg5)
 {
+#ifdef CONFIG_SECURITY_YAMA_STACKED
+	int rc;
+	rc = yama_task_prctl(option, arg2, arg3, arg4, arg5);
+	if (rc != -ENOSYS)
+		return rc;
+#endif
 	return security_ops->task_prctl(option, arg2, arg3, arg4, arg5);
 }
 

diff --git a/trunk/security/yama/Kconfig b/trunk/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/trunk/security/yama/yama_lsm.c b/trunk/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;
@@ -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;
@@ -296,7 +296,7 @@ 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;
 
@@ -330,6 +330,7 @@ static int yama_ptrace_traceme(struct task_struct *parent)
 	return rc;
 }
 
+#ifndef CONFIG_SECURITY_YAMA_STACKED
 static struct security_operations yama_ops = {
 	.name =			"yama",
 
@@ -338,6 +339,7 @@ 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,
@@ -384,13 +386,17 @@ 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))