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Avoid unconditional getrandom syscall creating a WasiCtx #5244

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Nov 10, 2022
Merged

Avoid unconditional getrandom syscall creating a WasiCtx #5244

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5 changes: 3 additions & 2 deletions crates/wasi-common/cap-std-sync/src/lib.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -47,7 +47,7 @@ pub use clocks::clocks_ctx;
pub use sched::sched_ctx;

use crate::net::Socket;
use cap_rand::RngCore;
use cap_rand::{Rng, RngCore, SeedableRng};
use std::path::Path;
use wasi_common::{file::FileCaps, table::Table, Error, WasiCtx, WasiFile};

Expand Down Expand Up @@ -141,5 +141,6 @@ impl WasiCtxBuilder {
}

pub fn random_ctx() -> Box<dyn RngCore + Send + Sync> {
Box::new(cap_rand::std_rng_from_entropy(cap_rand::ambient_authority()))
let mut rng = cap_rand::thread_rng(cap_rand::ambient_authority());
Box::new(cap_rand::rngs::StdRng::from_seed(rng.gen()))
}