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authorKees Cook <keescook@chromium.org>2012-09-04 13:32:13 -0700
committerJames Morris <james.l.morris@oracle.com>2012-09-05 14:12:31 -0700
commitc6993e4ac002c92bc75379212e9179c36d4bf7ee (patch)
treecdb4c800ea3cf4003b07087166cc767dab79032f
parent81198078d7da4240f3cbfc2c6a8ea6cd417f51a7 (diff)
downloadlinux-c6993e4ac002c92bc75379212e9179c36d4bf7ee.tar.bz2
security: allow Yama to be unconditionally stacked
Unconditionally call Yama when CONFIG_SECURITY_YAMA_STACKED is selected, no matter what LSM module is primary. Ubuntu and Chrome OS already carry patches to do this, and Fedora has voiced interest in doing this as well. Instead of having multiple distributions (or LSM authors) carrying these patches, just allow Yama to be called unconditionally when selected by the new CONFIG. Signed-off-by: Kees Cook <keescook@chromium.org> Acked-by: Serge E. Hallyn <serge.hallyn@canonical.com> Acked-by: Eric Paris <eparis@redhat.com> Acked-by: John Johansen <john.johansen@canonical.com> Signed-off-by: James Morris <james.l.morris@oracle.com>
-rw-r--r--include/linux/security.h31
-rw-r--r--security/security.c21
-rw-r--r--security/yama/Kconfig8
-rw-r--r--security/yama/yama_lsm.c14
4 files changed, 70 insertions, 4 deletions
diff --git a/include/linux/security.h b/include/linux/security.h
index 3dea6a9d568f..01ef030b9409 100644
--- a/include/linux/security.h
+++ b/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/security/security.c b/security/security.c
index 860aeb349cb3..68c1b9b45d93 100644
--- a/security/security.c
+++ b/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/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 d51b7c76c37d..9ca43c1ea630 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;
@@ -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))