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[PATCH] SELinux: Add security hook definition for getioprio and insert hooks

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Add a new security hook definition for the sys_ioprio_get operation.  At
present, the SELinux hook function implementation for this hook is
identical to the getscheduler implementation but a separate hook is
introduced to allow this check to be specialized in the future if
necessary.

This patch also creates a helper function get_task_ioprio which handles the
access check in addition to retrieving the ioprio value for the task.

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: Jens Axboe <axboe@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
David Quigley
2006-06-30 01:55:49 -07:00
committed by Linus Torvalds
parent 7a01955f99
commit a1836a42da
4 changed files with 51 additions and 5 deletions
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29
fs/ioprio.c
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@@ -125,11 +125,24 @@ asmlinkage long sys_ioprio_set(int which, int who, int ioprio)
return ret;
}
static int get_task_ioprio(struct task_struct *p)
{
int ret;
ret = security_task_getioprio(p);
if (ret)
goto out;
ret = p->ioprio;
out:
return ret;
}
asmlinkage long sys_ioprio_get(int which, int who)
{
struct task_struct *g, *p;
struct user_struct *user;
int ret = -ESRCH;
int tmpio;
read_lock_irq(&tasklist_lock);
switch (which) {
@@ -139,16 +152,19 @@ asmlinkage long sys_ioprio_get(int which, int who)
else
p = find_task_by_pid(who);
if (p)
ret = p->ioprio;
ret = get_task_ioprio(p);
break;
case IOPRIO_WHO_PGRP:
if (!who)
who = process_group(current);
do_each_task_pid(who, PIDTYPE_PGID, p) {
tmpio = get_task_ioprio(p);
if (tmpio < 0)
continue;
if (ret == -ESRCH)
ret = p->ioprio;
ret = tmpio;
else
ret = ioprio_best(ret, p->ioprio);
ret = ioprio_best(ret, tmpio);
} while_each_task_pid(who, PIDTYPE_PGID, p);
break;
case IOPRIO_WHO_USER:
@@ -163,10 +179,13 @@ asmlinkage long sys_ioprio_get(int which, int who)
do_each_thread(g, p) {
if (p->uid != user->uid)
continue;
tmpio = get_task_ioprio(p);
if (tmpio < 0)
continue;
if (ret == -ESRCH)
ret = p->ioprio;
ret = tmpio;
else
ret = ioprio_best(ret, p->ioprio);
ret = ioprio_best(ret, tmpio);
} while_each_thread(g, p);
if (who)