diff options
| author | John Stultz <john.stultz@linaro.org> | 2016-07-14 17:22:19 -0700 |
|---|---|---|
| committer | John Stultz <john.stultz@linaro.org> | 2016-07-25 14:35:11 -0700 |
| commit | 5d1b9c0c012ff96d543aa90db888ca511f53dfaa (patch) | |
| tree | 59b11af2375e6292564ffbde69dc7e7af693f0f1 /fs/proc/base.c | |
| parent | 419d43edc519b477d365b6311c48f875cec6bfdf (diff) | |
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>
Diffstat (limited to 'fs/proc/base.c')
| -rw-r--r-- | fs/proc/base.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/fs/proc/base.c b/fs/proc/base.c index ee1b021e153e..ac5d2aea63b5 100644 --- a/fs/proc/base.c +++ b/fs/proc/base.c @@ -2265,6 +2265,12 @@ static ssize_t timerslack_ns_write(struct file *file, const char __user *buf, 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; @@ -2293,6 +2299,10 @@ static int timerslack_ns_show(struct seq_file *m, void *v) 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); |