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runtime: use getrandom(2) for readRandom on Linux #69421

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runtime: use getrandom(2) for readRandom on Linux #69421

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Commits on Sep 12, 2024

  1. runtime: use getrandom(2) for readRandom on Linux 

    Add Getrandom to internal/runtime/syscall.

Use Getrandom instead of reading /dev/urandom to simplify the code.

Since Go 1.24 needs Linux kernel >= 3.2, and getrandom(2) was
introduced by Linux kernel 3.17, Getrandom could return ENOSYS.
This doesn't matter because the Linux kernel always sets startupRand,
so readRandom is usually not reachable. We also have a time-based
fallback even if readRandom fails.

Updates golang#51087
Fixes golang#68278
    @apocelipes
    apocelipes committed Sep 12, 2024
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