Oleg Nesterov <[email protected]> writes:
> On 12/05, Eric W. Biederman wrote:
>>
>> This modifies do_wait and eligible_child to take a pair of
>> enum pid_type and struct pid *pid to precisely specify what
>> set of processes are eligible to be waited for, instead of the
>> raw pid_t value from sys_wait4.
>
> Personally, I like this patch very much. Not only it fixes the bug,
> in my opinion it also makes the code more clean.
>
> However at first glance it has a minor fixable problem,
>
>> + if (type < PIDTYPE_MAX) {
>> + if (p->pids[type].pid != pid)
>> return 0;
>> }
>
> If type != PIDTYPE_PID we can't trust p->pids[type].pid unless p is a
> group leader. This .pid could be just a "random value".
Ugh. You are correct. Thanks for the review.
That is one annoying special case.
Eric
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