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Merge #910

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910: Use getrandom instead of rand r=MarkMcCaskey a=newpavlov

Closes #909

Note: I am reusing `__WASI_EIO` as an error code to denote a potential OS RNG failure.

Co-authored-by: newpavlov <newpavlov@gmail.com>
Co-authored-by: Artyom Pavlov <newpavlov@gmail.com>
This commit is contained in:
bors[bot] 2019-10-28 18:07:18 +00:00 committed by GitHub
commit d46e5d499c
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5 changed files with 16 additions and 16 deletions
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12
Cargo.lock generated
View File

@ -451,7 +451,7 @@ dependencies = [
[[package]]
name = "getrandom"
version = "0.1.12"
version = "0.1.13"
source = "registry+https://github.com/rust-lang/crates.io-index"
dependencies = [
"cfg-if 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)",
@ -818,7 +818,7 @@ name = "rand"
version = "0.7.2"
source = "registry+https://github.com/rust-lang/crates.io-index"
dependencies = [
"getrandom 0.1.12 (registry+https://github.com/rust-lang/crates.io-index)",
"getrandom 0.1.13 (registry+https://github.com/rust-lang/crates.io-index)",
"libc 0.2.65 (registry+https://github.com/rust-lang/crates.io-index)",
"rand_chacha 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
"rand_core 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
@ -852,7 +852,7 @@ name = "rand_core"
version = "0.5.1"
source = "registry+https://github.com/rust-lang/crates.io-index"
dependencies = [
"getrandom 0.1.12 (registry+https://github.com/rust-lang/crates.io-index)",
"getrandom 0.1.13 (registry+https://github.com/rust-lang/crates.io-index)",
]
[[package]]
@ -1415,9 +1415,9 @@ name = "wasmer-emscripten"
version = "0.9.0"
dependencies = [
"byteorder 1.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
"getrandom 0.1.13 (registry+https://github.com/rust-lang/crates.io-index)",
"lazy_static 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
"libc 0.2.65 (registry+https://github.com/rust-lang/crates.io-index)",
"rand 0.7.2 (registry+https://github.com/rust-lang/crates.io-index)",
"time 0.1.42 (registry+https://github.com/rust-lang/crates.io-index)",
"wasmer-runtime-core 0.9.0",
]
@ -1570,9 +1570,9 @@ dependencies = [
"bincode 1.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
"byteorder 1.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
"generational-arena 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
"getrandom 0.1.13 (registry+https://github.com/rust-lang/crates.io-index)",
"libc 0.2.65 (registry+https://github.com/rust-lang/crates.io-index)",
"log 0.4.8 (registry+https://github.com/rust-lang/crates.io-index)",
"rand 0.7.2 (registry+https://github.com/rust-lang/crates.io-index)",
"serde 1.0.101 (registry+https://github.com/rust-lang/crates.io-index)",
"time 0.1.42 (registry+https://github.com/rust-lang/crates.io-index)",
"typetag 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
@ -1698,7 +1698,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
"checksum gcc 0.3.55 (registry+https://github.com/rust-lang/crates.io-index)" = "8f5f3913fa0bfe7ee1fd8248b6b9f42a5af4b9d65ec2dd2c3c26132b950ecfc2"
"checksum generational-arena 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)" = "921c3803adaeb9f9639de5149d9f0f9f4b79f00c423915b701db2e02ed80b9ce"
"checksum generic-array 0.12.3 (registry+https://github.com/rust-lang/crates.io-index)" = "c68f0274ae0e023facc3c97b2e00f076be70e254bc851d972503b328db79b2ec"
"checksum getrandom 0.1.12 (registry+https://github.com/rust-lang/crates.io-index)" = "473a1265acc8ff1e808cd0a1af8cee3c2ee5200916058a2ca113c29f2d903571"
"checksum getrandom 0.1.13 (registry+https://github.com/rust-lang/crates.io-index)" = "e7db7ca94ed4cd01190ceee0d8a8052f08a247aa1b469a7f68c6a3b71afcf407"
"checksum ghost 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "2a36606a68532b5640dc86bb1f33c64b45c4682aad4c50f3937b317ea387f3d6"
"checksum glob 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)" = "8be18de09a56b60ed0edf84bc9df007e30040691af7acd1c41874faac5895bfb"
"checksum glob 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)" = "9b919933a397b79c37e33b77bb2aa3dc8eb6e165ad809e58ff75bc7db2e34574"

2
lib/emscripten/Cargo.toml
View File

@ -15,7 +15,7 @@ time = "0.1"
wasmer-runtime-core = { path = "../runtime-core", version = "0.9.0" }
[target.'cfg(windows)'.dependencies]
rand = "0.7"
getrandom = "0.1"
[features]
debug = ["wasmer-runtime-core/debug"]

4
lib/emscripten/src/syscalls/windows.rs
View File

@ -2,7 +2,6 @@ use crate::utils::{copy_cstr_into_wasm, get_cstr_path};
use crate::varargs::VarArgs;
use libc::mkdir;
use libc::open;
use rand::Rng;
use std::env;
use std::ffi::CString;
use std::fs::File;
@ -39,7 +38,8 @@ pub fn ___syscall5(ctx: &mut Ctx, which: c_int, mut varargs: VarArgs) -> c_int {
let ptr = tmp_dir_c_str.as_ptr() as *const i8;
let mut urandom_file = File::create(tmp_dir).unwrap();
// create some random bytes and put them into the file
let random_bytes = rand::thread_rng().gen::<[u8; 32]>();
let mut random_bytes = [0u8; 32];
getrandom::getrandom(&mut random_bytes).unwrap();
let _ = urandom_file.write_all(&random_bytes).unwrap();
// put the file path string into wasm memory
let urandom_file_offset = unsafe { copy_cstr_into_wasm(ctx, ptr) };

2
lib/wasi/Cargo.toml
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@ -13,7 +13,7 @@ byteorder = "1.3"
generational-arena = { version = "0.2", features = ["serde"] }
libc = "0.2.60"
log = "0.4"
rand = "0.7"
getrandom = "0.1"
time = "0.1"
typetag = "0.1"
serde = { version = "1", features = ["derive"] }

12
lib/wasi/src/syscalls/mod.rs
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@ -15,7 +15,6 @@ use crate::{
},
ExitCode,
};
use rand::{thread_rng, Rng};
use std::borrow::Borrow;
use std::cell::Cell;
use std::convert::{Infallible, TryInto};
@ -2453,17 +2452,18 @@ pub fn proc_raise(ctx: &mut Ctx, sig: __wasi_signal_t) -> __wasi_errno_t {
/// The number of bytes that will be written
pub fn random_get(ctx: &mut Ctx, buf: WasmPtr<u8, Array>, buf_len: u32) -> __wasi_errno_t {
debug!("wasi::random_get buf_len: {}", buf_len);
let mut rng = thread_rng();
let memory = ctx.memory(0);
let buf = wasi_try!(buf.deref(memory, 0, buf_len));
unsafe {
let res = unsafe {
let u8_buffer = &mut *(buf as *const [_] as *mut [_] as *mut [u8]);
thread_rng().fill(u8_buffer);
getrandom::getrandom(u8_buffer)
};
match res {
Ok(()) => __WASI_ESUCCESS,
Err(_) => __WASI_EIO,
}
__WASI_ESUCCESS
}
/// ### `sched_yield()`