From: | David Steele <david(at)pgmasters(dot)net> |
---|---|
To: | Daniel Gustafsson <daniel(at)yesql(dot)se> |
Cc: | Postgres hackers <pgsql-hackers(at)lists(dot)postgresql(dot)org> |
Subject: | Re: OpenSSL randomness seeding |
Date: | 2020-07-21 20:00:42 |
Message-ID: | 9bd6d0db-4910-9f3a-3acc-7dd9112a71eb@pgmasters.net |
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Lists: | pgsql-hackers |
On 7/21/20 3:44 PM, Daniel Gustafsson wrote:
>> On 21 Jul 2020, at 17:31, David Steele <david(at)pgmasters(dot)net> wrote:
>> On 7/21/20 8:13 AM, Daniel Gustafsson wrote:
>
>>> Another thing that stood out when reviewing this code is that we optimize for
>>> RAND_poll failing in pg_strong_random, when we already have RAND_status
>>> checking for a sufficiently seeded RNG for us. ISTM that we can simplify the
>>> code by letting RAND_status do the work as per 0002, and also (while unlikely)
>>> survive any transient failures in RAND_poll by allowing all the retries we've
>>> defined for the loop.
>>
>> I wonder how effective the retries are going to be if they happen immediately. However, most of the code paths I followed ended in a hard error when pg_strong_random() failed so it may not hurt to try. I just worry that some caller is depending on a faster failure here.
>
> There is that, but I'm not convinced that relying on specific timing for
> anything RNG or similarly cryptographic-related is especially sane.
I wasn't thinking specific timing -- just that the caller might be
expecting it to give up quickly if it doesn't work. That's what the code
is trying to do and I wonder if there is a reason for it.
But you are probably correct and I'm just overthinking it.
Regards,
--
-David
david(at)pgmasters(dot)net
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