iv/linux
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

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

Browse Source 
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
This commit is contained in:
Thomas Gleixner
2019-08-21 21:08:50 +02:00
parent bfcf3e92c6
commit e5a8b65b4c
1 changed files with 3 additions and 32 deletions
Download Patch File Download Diff File Expand all files Collapse all files

35
kernel/time/posix-cpu-timers.c
View File

@@ -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;
}
/*