From 22fb52dd736a62e24c44c50739007496265dc38c Mon Sep 17 00:00:00 2001 From: David Quigley Date: Fri, 23 Jun 2006 02:04:00 -0700 Subject: [PATCH] [PATCH] SELinux: add security hook call to mediate attach_task (kernel/cpuset.c) Add a security hook call to enable security modules to control the ability to attach a task to a cpuset. While limited control over this operation is possible via permission checks on the pseudo fs interface, those checks are not sufficient to control access to the target task, which is looked up in this function. The existing task_setscheduler hook is re-used for this operation since this falls under the same class of operations. Signed-off-by: David Quigley Acked-by: Stephen Smalley Signed-off-by: James Morris Acked-by: Paul Jackson Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- kernel/cpuset.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/kernel/cpuset.c b/kernel/cpuset.c index 77f45ffd5ea1..b602f73fb38d 100644 --- a/kernel/cpuset.c +++ b/kernel/cpuset.c @@ -41,6 +41,7 @@ #include #include #include +#include #include #include #include @@ -1177,6 +1178,7 @@ static int attach_task(struct cpuset *cs, char *pidbuf, char **ppathbuf) cpumask_t cpus; nodemask_t from, to; struct mm_struct *mm; + int retval; if (sscanf(pidbuf, "%d", &pid) != 1) return -EIO; @@ -1205,6 +1207,12 @@ static int attach_task(struct cpuset *cs, char *pidbuf, char **ppathbuf) get_task_struct(tsk); } + retval = security_task_setscheduler(tsk, 0, NULL); + if (retval) { + put_task_struct(tsk); + return retval; + } + mutex_lock(&callback_mutex); task_lock(tsk);