FROMLIST: 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. Cc: Kees Cook <keescook@chromium.org> Cc: "Serge E. Hallyn" <serge@hallyn.com> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Thomas Gleixner <tglx@linutronix.de> CC: Arjan van de Ven <arjan@linux.intel.com> Cc: Oren Laadan <orenl@cellrox.com> Cc: Ruchi Kandoi <kandoiruchi@google.com> Cc: Rom Lemarchand <romlem@android.com> Cc: Todd Kjos <tkjos@google.com> Cc: Colin Cross <ccross@android.com> Cc: Nick Kralevich <nnk@google.com> Cc: Dmitry Shmidt <dimitrysh@google.com> Cc: Elliott Hughes <enh@google.com> Cc: James Morris <jmorris@namei.org> Cc: Android Kernel Team <kernel-team@android.com> Cc: linux-security-module@vger.kernel.org Cc: selinux@tycho.nsa.gov Signed-off-by: John Stultz <john.stultz@linaro.org> FROMLIST URL: https://lkml.org/lkml/2016/7/21/523 Change-Id: Id157d10e2fe0b85f1be45035a6117358a42af028 (Cherry picked back to common/android-4.4) Signed-off-by: John Stultz <john.stultz@linaro.org>
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@ -2266,6 +2266,12 @@ static ssize_t timerslack_ns_write(struct file *file, const char __user *buf,
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goto out;
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}
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err = security_task_setscheduler(p);
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if (err) {
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count = err;
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goto out;
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}
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task_lock(p);
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if (slack_ns == 0)
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p->timer_slack_ns = p->default_timer_slack_ns;
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@ -2294,6 +2300,10 @@ static int timerslack_ns_show(struct seq_file *m, void *v)
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goto out;
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}
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err = security_task_getscheduler(p);
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if (err)
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goto out;
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task_lock(p);
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seq_printf(m, "%llu\n", p->timer_slack_ns);
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task_unlock(p);
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