Change in osmocom-bb[master]: Move from libc random() to osmo_get_rand_id

[Holger Freyther]

Hello Vadim Yanitskiy, Jenkins Builder, 

I'd like you to reexamine a change. Please visit

    https://gerrit.osmocom.org/9914

to look at the new patch set (#2).

Change subject: Move from libc random() to osmo_get_rand_id
......................................................................

Move from libc random() to osmo_get_rand_id

When starting multiple mobile in the same second, the libc random number
generator will be seeded to exactly the same value.

The random bits inside the RACH request(s) will be exactly the same
across multiple mobile and when the channel fails they all pick the same
randomized back-off timing.

Use stronger random numbers and replace all calls to random(2) with
osmo_get_rand_id. Add a fallback to try random().

Change-Id: Ie0cc64663cd4b90c027b79545dc5d3ac9d87b9dd
---
M src/host/layer23/src/mobile/gsm322.c
M src/host/layer23/src/mobile/gsm48_mm.c
M src/host/layer23/src/mobile/gsm48_rr.c
M src/host/layer23/src/mobile/settings.c
4 files changed, 18 insertions(+), 5 deletions(-)


  git pull ssh://gerrit.osmocom.org:29418/osmocom-bb refs/changes/14/9914/2
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Gerrit-Project: osmocom-bb
Gerrit-Branch: master
Gerrit-MessageType: newpatchset
Gerrit-Change-Id: Ie0cc64663cd4b90c027b79545dc5d3ac9d87b9dd
Gerrit-Change-Number: 9914
Gerrit-PatchSet: 2
Gerrit-Owner: Holger Freyther <holger at freyther.de>
Gerrit-Reviewer: Holger Freyther <holger at freyther.de>
Gerrit-Reviewer: Jenkins Builder
Gerrit-Reviewer: Vadim Yanitskiy <axilirator at gmail.com>
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