Commit 35601547 authored by David Quigley's avatar David Quigley Committed by Linus Torvalds
Browse files

[PATCH] SELinux: add task_movememory hook 



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 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.

Signed-off-by: default avatarDavid Quigley <dpquigl@tycho.nsa.gov>
Acked-by: default avatarStephen Smalley <sds@tycho.nsa.gov>
Signed-off-by: default avatarJames Morris <jmorris@namei.org>
Cc: Christoph Lameter <clameter@sgi.com>
Cc: Andi Kleen <ak@muc.de>
Acked-by: default avatarChris Wright <chrisw@sous-sol.org>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent 22fb52dd

include/linux/security.h

+15 −0
Original line number Diff line number Diff line
@@ -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
@@ -1220,6 +1224,7 @@ 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);
@@ -1865,6 +1870,11 @@ static inline int security_task_getscheduler (struct task_struct *p) 
	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)

{
@@ -2512,6 +2522,11 @@ static inline int security_task_getscheduler (struct task_struct *p) 
	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)

{

security/dummy.c

+6 −0
Original line number Diff line number Diff line
@@ -537,6 +537,11 @@ static int dummy_task_getscheduler (struct task_struct *p) 
	return 0;

}



static int dummy_task_movememory (struct task_struct *p)

{

	return 0;

}



static int dummy_task_wait (struct task_struct *p)

{

	return 0;
@@ -981,6 +986,7 @@ void security_fixup_ops (struct security_operations *ops) 
	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);

security/selinux/hooks.c

+6 −0
Original line number Diff line number Diff line
@@ -2679,6 +2679,11 @@ static int selinux_task_getscheduler(struct task_struct *p) 
	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;
@@ -4392,6 +4397,7 @@ static struct security_operations selinux_ops = { 
	.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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