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util.random: Test whether util.crand works before using it (fix #1734)

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util.crand can be configured at compile time to use the Linux
getrandom() system call, available from Linux 3.17, but it is still
possible to load it with an older kernel lacking that system call, where
attempting to use it throws an ENOSYS error.

By testing for this on load we can fall back to /dev/urandom in this
case.
This commit is contained in:
Kim Alvefur 2022-04-02 16:33:27 +02:00
parent f19f1088b7
commit 1e2d4026f9
1 changed files with 1 additions and 1 deletions
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2
util/random.lua
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@ -7,7 +7,7 @@
--
local ok, crand = pcall(require, "util.crand");
if ok then return crand; end
if ok and pcall(crand.bytes, 1) then return crand; end
local urandom, urandom_err = io.open("/dev/urandom", "r");