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[PATCH] SELinux: add task_movememory hook

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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: David Quigley <dpquigl@tycho.nsa.gov>
Acked-by:  Stephen Smalley <sds@tycho.nsa.gov>
Signed-off-by: James Morris <jmorris@namei.org>
Cc: Christoph Lameter <clameter@sgi.com>
Cc: Andi Kleen <ak@muc.de>
Acked-by: Chris Wright <chrisw@sous-sol.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
David Quigley 2006-06-23 02:04:01 -07:00 committed by Linus Torvalds
parent 22fb52dd73
commit 35601547ba
3 changed files with 27 additions and 0 deletions
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15
include/linux/security.h
View File

@ -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)
{

6
security/dummy.c
View File

@ -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);

6
security/selinux/hooks.c
View File

@ -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,