linux-kernel - Re: [PATCH] aio: add timeout validity check for io

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Message-ID: <x49y30gnb16.fsf@segfault.boston.devel.redhat.com>
Date:   Mon, 29 Jul 2019 10:57:41 -0400
From:   Jeff Moyer <jmoyer@...hat.com>
To:     <viro@...iv.linux.org.uk>, "zhangyi \(F\)" <yi.zhang@...wei.com>
Cc:     <linux-aio@...ck.org>, <linux-fsdevel@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <bcrl@...ck.org>,
        <wangkefeng.wang@...wei.com>
Subject: Re: [PATCH] aio: add timeout validity check for io_[p]getevents

Al, can you take this through your tree?

Thanks,
Jeff

Jeff Moyer <jmoyer@...hat.com> writes:

> "zhangyi (F)" <yi.zhang@...wei.com> writes:
>
>> io_[p]getevents syscall should return -EINVAL if if timeout is out of
>> range, add this validity check.
>>
>> Signed-off-by: zhangyi (F) <yi.zhang@...wei.com>
>> ---
>>  fs/aio.c | 11 +++++++++--
>>  1 file changed, 9 insertions(+), 2 deletions(-)
>>
>> diff --git a/fs/aio.c b/fs/aio.c
>> index 01e0fb9..dd967a0 100644
>> --- a/fs/aio.c
>> +++ b/fs/aio.c
>> @@ -2031,10 +2031,17 @@ static long do_io_getevents(aio_context_t ctx_id,
>>  		struct io_event __user *events,
>>  		struct timespec64 *ts)
>>  {
>> -	ktime_t until = ts ? timespec64_to_ktime(*ts) : KTIME_MAX;
>> -	struct kioctx *ioctx = lookup_ioctx(ctx_id);
>> +	ktime_t until = KTIME_MAX;
>> +	struct kioctx *ioctx = NULL;
>>  	long ret = -EINVAL;
>>  
>> +	if (ts) {
>> +		if (!timespec64_valid(ts))
>> +			return ret;
>> +		until = timespec64_to_ktime(*ts);
>> +	}
>> +
>> +	ioctx = lookup_ioctx(ctx_id);
>>  	if (likely(ioctx)) {
>>  		if (likely(min_nr <= nr && min_nr >= 0))
>>  			ret = read_events(ioctx, min_nr, nr, events, until);
>
> Reviewed-by: Jeff Moyer <jmoyer@...hat.com>
>
> The previous suggestion[1] of fixing the helpers never materialized, so
> let's just get this fixed, already.
>
> -Jeff
>
> [1] https://marc.info/?l=linux-fsdevel&m=152209450618587&w=2
>
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