[PATCH 1/3] SELinux: add task_movememory hook

[James Morris <jmorris@namei.org>]

From: David Quigley <dpquigl@tycho.nsa.gov>

This patch adds new security hook, task_movememory, to be called when 
memory owened by a task is to be moved (e.g. when migrating pages to a 
different node). At present, the SELinux hook function implementation for 
this hook is identical to the setscheduler implementation, but a separate 
hook introduced to allow this check to be specialized in the future if 
necessary.

Since the last posting, the hook has been renamed following feedback from
Christoph Lameter.

This patch is aimed at 2.6.18 inclusion.

Please apply.

Signed-Off-By: David Quigley <dpquigl@tycho.nsa.gov>
Acked-by:  Stephen Smalley <sds@tycho.nsa.gov>
Signed-off-by: James Morris <jmorris@namei.org>

---

 include/linux/security.h |   15 +++++++++++++++
 security/dummy.c         |    6 ++++++
 security/selinux/hooks.c |    6 ++++++
 3 files changed, 27 insertions(+)

diff -purN -X dontdiff linux-2.6.17-mm1.p/include/linux/security.h linux-2.6.17-mm1.w/include/linux/security.h
--- linux-2.6.17-mm1.p/include/linux/security.h	2006-06-21 11:54:11.000000000 -0400
+++ linux-2.6.17-mm1.w/include/linux/security.h	2006-06-21 16:57:53.000000000 -0400
@@ -601,6 +601,10 @@ struct swap_info_struct;
  *	@p.
  *	@p contains the task_struct for process.
  *	Return 0 if permission is granted.
+ * @task_movememory
+ *	Check permission before moving memory owned by process @p.
+ *	@p contains the task_struct for process.
+ *	Return 0 if permission is granted.
  * @task_kill:
  *	Check permission before sending signal @sig to @p.  @info can be NULL,
  *	the constant 1, or a pointer to a siginfo structure.  If @info is 1 or
@@ -1221,6 +1225,7 @@ struct security_operations {
 	int (*task_setscheduler) (struct task_struct * p, int policy,
 				  struct sched_param * lp);
 	int (*task_getscheduler) (struct task_struct * p);
+	int (*task_movememory) (struct task_struct * p); 
 	int (*task_kill) (struct task_struct * p,
 			  struct siginfo * info, int sig);
 	int (*task_wait) (struct task_struct * p);
@@ -1866,6 +1871,11 @@ static inline int security_task_getsched
 	return security_ops->task_getscheduler (p);
 }
 
+static inline int security_task_movememory (struct task_struct *p)
+{
+	return security_ops->task_movememory (p);
+}
+
 static inline int security_task_kill (struct task_struct *p,
 				      struct siginfo *info, int sig)
 {
@@ -2513,6 +2523,11 @@ static inline int security_task_getsched
 	return 0;
 }
 
+static inline int security_task_movememory (struct task_struct *p)
+{
+	return 0;
+}
+
 static inline int security_task_kill (struct task_struct *p,
 				      struct siginfo *info, int sig)
 {
diff -purN -X dontdiff linux-2.6.17-mm1.p/security/dummy.c linux-2.6.17-mm1.w/security/dummy.c
--- linux-2.6.17-mm1.p/security/dummy.c	2006-06-21 11:54:12.000000000 -0400
+++ linux-2.6.17-mm1.w/security/dummy.c	2006-06-21 16:58:22.000000000 -0400
@@ -537,6 +537,11 @@ static int dummy_task_getscheduler (stru
 	return 0;
 }
 
+static int dummy_task_movememory (struct task_struct *p)
+{
+	return 0;
+}
+
 static int dummy_task_wait (struct task_struct *p)
 {
 	return 0;
@@ -982,6 +987,7 @@ void security_fixup_ops (struct security
 	set_to_dummy_if_null(ops, task_setrlimit);
 	set_to_dummy_if_null(ops, task_setscheduler);
 	set_to_dummy_if_null(ops, task_getscheduler);
+	set_to_dummy_if_null(ops, task_movememory);
 	set_to_dummy_if_null(ops, task_wait);
 	set_to_dummy_if_null(ops, task_kill);
 	set_to_dummy_if_null(ops, task_prctl);
diff -purN -X dontdiff linux-2.6.17-mm1.p/security/selinux/hooks.c linux-2.6.17-mm1.w/security/selinux/hooks.c
--- linux-2.6.17-mm1.p/security/selinux/hooks.c	2006-06-21 11:54:12.000000000 -0400
+++ linux-2.6.17-mm1.w/security/selinux/hooks.c	2006-06-21 16:58:40.000000000 -0400
@@ -2690,6 +2690,11 @@ static int selinux_task_getscheduler(str
 	return task_has_perm(current, p, PROCESS__GETSCHED);
 }
 
+static int selinux_task_movememory(struct task_struct *p)
+{
+	return task_has_perm(current, p, PROCESS__SETSCHED);
+}
+
 static int selinux_task_kill(struct task_struct *p, struct siginfo *info, int sig)
 {
 	u32 perm;
@@ -4416,6 +4421,7 @@ static struct security_operations selinu
 	.task_setrlimit =		selinux_task_setrlimit,
 	.task_setscheduler =		selinux_task_setscheduler,
 	.task_getscheduler =		selinux_task_getscheduler,
+	.task_movememory =		selinux_task_movememory,
 	.task_kill =			selinux_task_kill,
 	.task_wait =			selinux_task_wait,
 	.task_prctl =			selinux_task_prctl,
-
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