The patch titled
Subject: proc: add LSM hook checks to /proc/<tid>/timerslack_ns
has been added to the -mm tree. Its filename is
proc-add-lsm-hook-checks-to-proc-tid-timerslack_ns.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/proc-add-lsm-hook-checks-to-proc-tid-timerslack_ns.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/proc-add-lsm-hook-checks-to-proc-tid-timerslack_ns.patch
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------------------------------------------------------
From: John Stultz <john.stultz@xxxxxxxxxx>
Subject: proc: add LSM hook checks to /proc/<tid>/timerslack_ns
As requested, this patch checks the existing LSM hooks
task_getscheduler/task_setscheduler when reading or modifying the task's
timerslack value.
Previous versions added new get/settimerslack LSM hooks, but since they
checked the same PROCESS__SET/GETSCHED values as existing hooks, it was
suggested we just use the existing ones.
Link: http://lkml.kernel.org/r/1469132667-17377-2-git-send-email-john.stultz@xxxxxxxxxx
Signed-off-by: John Stultz <john.stultz@xxxxxxxxxx>
Cc: Kees Cook <keescook@xxxxxxxxxxxx>
Cc: "Serge E. Hallyn" <serge@xxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Arjan van de Ven <arjan@xxxxxxxxxxxxxxx>
Cc: Oren Laadan <orenl@xxxxxxxxxxx>
Cc: Ruchi Kandoi <kandoiruchi@xxxxxxxxxx>
Cc: Rom Lemarchand <romlem@xxxxxxxxxxx>
Cc: Todd Kjos <tkjos@xxxxxxxxxx>
Cc: Colin Cross <ccross@xxxxxxxxxxx>
Cc: Nick Kralevich <nnk@xxxxxxxxxx>
Cc: Dmitry Shmidt <dimitrysh@xxxxxxxxxx>
Cc: Elliott Hughes <enh@xxxxxxxxxx>
Cc: James Morris <jmorris@xxxxxxxxx>
Cc: Android Kernel Team <kernel-team@xxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
fs/proc/base.c | 10 ++++++++++
1 file changed, 10 insertions(+)
diff -puN fs/proc/base.c~proc-add-lsm-hook-checks-to-proc-tid-timerslack_ns fs/proc/base.c
--- a/fs/proc/base.c~proc-add-lsm-hook-checks-to-proc-tid-timerslack_ns
+++ a/fs/proc/base.c
@@ -2290,6 +2290,12 @@ static ssize_t timerslack_ns_write(struc
goto out;
}
+ err = security_task_setscheduler(p);
+ if (err) {
+ count = err;
+ goto out;
+ }
+
task_lock(p);
if (slack_ns == 0)
p->timer_slack_ns = p->default_timer_slack_ns;
@@ -2318,6 +2324,10 @@ static int timerslack_ns_show(struct seq
goto out;
}
+ err = security_task_getscheduler(p);
+ if (err)
+ goto out;
+
task_lock(p);
seq_printf(m, "%llu\n", p->timer_slack_ns);
task_unlock(p);
_
Patches currently in -mm which might be from john.stultz@xxxxxxxxxx are
proc-relax-proc-tid-timerslack_ns-capability-requirements.patch
proc-add-lsm-hook-checks-to-proc-tid-timerslack_ns.patch
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