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Subject[tip: timers/core] posix-cpu-timers: Use common permission check in posix_cpu_timer_create()
The following commit has been merged into the timers/core branch of tip:

Commit-ID: e5a8b65b4cb2fe024b83bdec0424269949cc0a27
Gitweb: https://git.kernel.org/tip/e5a8b65b4cb2fe024b83bdec0424269949cc0a27
Author: Thomas Gleixner <tglx@linutronix.de>
AuthorDate: Wed, 21 Aug 2019 21:08:50 +02:00
Committer: Thomas Gleixner <tglx@linutronix.de>
CommitterDate: Wed, 28 Aug 2019 11:50:25 +02:00

posix-cpu-timers: Use common permission check in posix_cpu_timer_create()

Yet another copy of the same thing gone...

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Frederic Weisbecker <frederic@kernel.org>
Link: https://lkml.kernel.org/r/20190821192919.505833418@linutronix.de

---
kernel/time/posix-cpu-timers.c | 35 ++-------------------------------
1 file changed, 3 insertions(+), 32 deletions(-)

diff --git a/kernel/time/posix-cpu-timers.c b/kernel/time/posix-cpu-timers.c
index eb11117..4426a0f 100644
--- a/kernel/time/posix-cpu-timers.c
+++ b/kernel/time/posix-cpu-timers.c
@@ -316,44 +316,15 @@ static int posix_cpu_clock_get(const clockid_t clock, struct timespec64 *tp)
*/
static int posix_cpu_timer_create(struct k_itimer *new_timer)
{
- int ret = 0;
- const pid_t pid = CPUCLOCK_PID(new_timer->it_clock);
- struct task_struct *p;
+ struct task_struct *p = get_task_for_clock(new_timer->it_clock);

- if (CPUCLOCK_WHICH(new_timer->it_clock) >= CPUCLOCK_MAX)
+ if (!p)
return -EINVAL;

new_timer->kclock = &clock_posix_cpu;
-
INIT_LIST_HEAD(&new_timer->it.cpu.entry);
-
- rcu_read_lock();
- if (CPUCLOCK_PERTHREAD(new_timer->it_clock)) {
- if (pid == 0) {
- p = current;
- } else {
- p = find_task_by_vpid(pid);
- if (p && !same_thread_group(p, current))
- p = NULL;
- }
- } else {
- if (pid == 0) {
- p = current->group_leader;
- } else {
- p = find_task_by_vpid(pid);
- if (p && !has_group_leader_pid(p))
- p = NULL;
- }
- }
new_timer->it.cpu.task = p;
- if (p) {
- get_task_struct(p);
- } else {
- ret = -EINVAL;
- }
- rcu_read_unlock();
-
- return ret;
+ return 0;
}

/*
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