[tor-bugs] #23061 [Core Tor/Tor]: crypto_rand_double() should produce all possible outputs on platforms with 32-bit int

Tor Bug Tracker & Wiki blackhole at torproject.org
Mon Aug 28 19:18:44 UTC 2017


#23061: crypto_rand_double() should produce all possible outputs on platforms with
32-bit int
-------------------------------------------------+-------------------------
 Reporter:  teor                                 |          Owner:  nickm
     Type:  defect                               |         Status:
                                                 |  needs_review
 Priority:  Medium                               |      Milestone:  Tor:
                                                 |  0.3.2.x-final
Component:  Core Tor/Tor                         |        Version:  Tor:
                                                 |  0.2.2.14-alpha
 Severity:  Normal                               |     Resolution:
 Keywords:  tor-relay, security-low, privcount,  |  Actual Points:  0.5
  031-backport, 030-backport, 029-backport, 028  |
  -backport-maybe, 026-backport-maybe, review-   |
  group-22                                       |
Parent ID:                                       |         Points:  0.1
 Reviewer:                                       |        Sponsor:
                                                 |  SponsorQ
-------------------------------------------------+-------------------------

Comment (by yawning):

 Replying to [comment:35 catalyst]:
 > Also intermediate results with greater precision may occur (e.g., on x87
 -- this is probably how you got greater than 53 bits of precision reported
 in your tests with the "naive" approach) and maybe we should allow those?

 Unless teor's system or compiler is outdated garbage it will use the SSE2
 unit for floating point math.

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/23061#comment:36>
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