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mcexec: protect against incorrect partitioned execution argument (-n) using timeouts

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This commit is contained in:
Balazs Gerofi
2017-11-20 17:05:49 +09:00
parent 2f0089dfb9
commit 35f908b75c
2 changed files with 43 additions and 2 deletions
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44
executer/kernel/mcctrl/control.c
View File

@ -632,6 +632,7 @@ static long mcexec_get_cpuset(ihk_os_t os, unsigned long arg)
pli->task = current;
pli->ready = 0;
pli->timeout = 0;
init_waitqueue_head(&pli->pli_wq);
pli_next = NULL;
@ -693,11 +694,50 @@ static long mcexec_get_cpuset(ihk_os_t os, unsigned long arg)
dprintk("%s: pid: %d, waiting in list\n",
__FUNCTION__, task_tgid_vnr(current));
mutex_unlock(&pe->lock);
ret = wait_event_interruptible(pli->pli_wq, pli->ready);
/* Timeout period: 10 secs + (#procs * 0.1sec) */
ret = wait_event_interruptible_timeout(pli->pli_wq,
pli->ready,
msecs_to_jiffies(10000 + req.nr_processes * 100));
mutex_lock(&pe->lock);
if (ret != 0) {
/* First timeout task? Wake up everyone else,
* but tell them we timed out */
if (ret == 0) {
printk("%s: error: pid: %d, timed out, waking everyone\n",
__FUNCTION__, task_tgid_vnr(current));
while (!list_empty(&pe->pli_list)) {
pli_next = list_first_entry(&pe->pli_list,
struct process_list_item, list);
list_del(&pli_next->list);
pli_next->ready = 1;
pli_next->timeout = 1;
wake_up_interruptible(&pli_next->pli_wq);
}
/* Reset process counter to start state */
pe->nr_processes = -1;
ret = -ETIMEDOUT;
goto put_and_unlock_out;
}
/* Interrupted or woken up by someone else due to time out? */
if (ret < 0 || pli->timeout) {
if (ret > 0) {
printk("%s: error: pid: %d, job startup timed out\n",
__FUNCTION__, task_tgid_vnr(current));
ret = -ETIMEDOUT;
}
goto put_and_unlock_out;
}
/* Incorrect wakeup state? */
if (!pli->ready) {
printk("%s: error: pid: %d, not ready but woken?\n",
__FUNCTION__, task_tgid_vnr(current));
ret = -EINVAL;
goto put_and_unlock_out;
}
dprintk("%s: pid: %d, woken up\n",
__FUNCTION__, task_tgid_vnr(current));
}

1
executer/kernel/mcctrl/mcctrl.h
View File

@ -304,6 +304,7 @@ struct node_topology {
struct process_list_item {
int ready;
int timeout;
struct task_struct *task;
struct list_head list;
wait_queue_head_t pli_wq;