diff options
author | John Stultz <[email protected]> | 2016-10-07 17:02:29 -0700 |
---|---|---|
committer | Linus Torvalds <[email protected]> | 2016-10-07 18:46:30 -0700 |
commit | 904763e1fb5eebf8249ec41a2019e5e32246df2f (patch) | |
tree | c74767dca5a638371a2cb3121a207ed7137b7b2a | |
parent | 7abbaf94049914f074306d960b0f968ffe52e59f (diff) |
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/[email protected]
Signed-off-by: John Stultz <[email protected]>
Cc: Kees Cook <[email protected]>
Cc: "Serge E. Hallyn" <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: Arjan van de Ven <[email protected]>
Cc: Oren Laadan <[email protected]>
Cc: Ruchi Kandoi <[email protected]>
Cc: Rom Lemarchand <[email protected]>
Cc: Todd Kjos <[email protected]>
Cc: Colin Cross <[email protected]>
Cc: Nick Kralevich <[email protected]>
Cc: Dmitry Shmidt <[email protected]>
Cc: Elliott Hughes <[email protected]>
Cc: James Morris <[email protected]>
Cc: Android Kernel Team <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
-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 248f008d46b8..ebccdc192830 100644 --- a/fs/proc/base.c +++ b/fs/proc/base.c @@ -2285,6 +2285,12 @@ 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; @@ -2313,6 +2319,10 @@ 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); |