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Auto merge of #45896 - malbarbo:use-libc-const, r=alexcrichton

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Use getrandom syscall for all Linux and Android targets.

I suppose we can use it in all Linux and Android targets. In function `is_getrandom_available` is checked if the syscall is available (getrandom syscall was add in version 3.17 of Linux kernel), if the syscall is not available `fill_bytes` fallback to reading from `/dev/urandom`.

Update libc to include getrandom related constants.
This commit is contained in:
bors 2017-11-14 13:46:19 +00:00
commit 9cd994cdc1
2 changed files with 6 additions and 51 deletions
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2
src/liblibc

@ -1 +1 @@
Subproject commit 68f9959e53da6c70bed7119cd09342859d431266
Subproject commit c1068cd82ae55907e8fd4457b98278a3aaa9162b

55
src/libstd/sys/unix/rand.rs
View File

@ -32,45 +32,14 @@ mod imp {
use libc;
use sys::os::errno;
#[cfg(all(target_os = "linux",
any(target_arch = "x86_64",
target_arch = "x86",
target_arch = "arm",
target_arch = "aarch64",
target_arch = "powerpc",
target_arch = "powerpc64",
target_arch = "s390x")))]
#[cfg(any(target_os = "linux", target_os = "android"))]
fn getrandom(buf: &mut [u8]) -> libc::c_long {
#[cfg(all(target_arch = "x86_64", target_pointer_width = "32"))]
const NR_GETRANDOM: libc::c_long = 0x40000000 + 318;
#[cfg(all(target_arch = "x86_64", target_pointer_width = "64"))]
const NR_GETRANDOM: libc::c_long = 318;
#[cfg(target_arch = "x86")]
const NR_GETRANDOM: libc::c_long = 355;
#[cfg(target_arch = "arm")]
const NR_GETRANDOM: libc::c_long = 384;
#[cfg(target_arch = "s390x")]
const NR_GETRANDOM: libc::c_long = 349;
#[cfg(any(target_arch = "powerpc", target_arch = "powerpc64"))]
const NR_GETRANDOM: libc::c_long = 359;
#[cfg(target_arch = "aarch64")]
const NR_GETRANDOM: libc::c_long = 278;
const GRND_NONBLOCK: libc::c_uint = 0x0001;
unsafe {
libc::syscall(NR_GETRANDOM, buf.as_mut_ptr(), buf.len(), GRND_NONBLOCK)
libc::syscall(libc::SYS_getrandom, buf.as_mut_ptr(), buf.len(), libc::GRND_NONBLOCK)
}
}
#[cfg(not(all(target_os = "linux",
any(target_arch = "x86_64",
target_arch = "x86",
target_arch = "arm",
target_arch = "aarch64",
target_arch = "powerpc",
target_arch = "powerpc64",
target_arch = "s390x"))))]
#[cfg(not(any(target_os = "linux", target_os = "android")))]
fn getrandom(_buf: &mut [u8]) -> libc::c_long { -1 }
fn getrandom_fill_bytes(v: &mut [u8]) -> bool {
@ -94,14 +63,7 @@ mod imp {
return true
}
#[cfg(all(target_os = "linux",
any(target_arch = "x86_64",
target_arch = "x86",
target_arch = "arm",
target_arch = "aarch64",
target_arch = "powerpc",
target_arch = "powerpc64",
target_arch = "s390x")))]
#[cfg(any(target_os = "linux", target_os = "android"))]
fn is_getrandom_available() -> bool {
use io;
use sync::atomic::{AtomicBool, Ordering};
@ -125,14 +87,7 @@ mod imp {
AVAILABLE.load(Ordering::Relaxed)
}
#[cfg(not(all(target_os = "linux",
any(target_arch = "x86_64",
target_arch = "x86",
target_arch = "arm",
target_arch = "aarch64",
target_arch = "powerpc",
target_arch = "powerpc64",
target_arch = "s390x"))))]
#[cfg(not(any(target_os = "linux", target_os = "android")))]
fn is_getrandom_available() -> bool { false }
pub fn fill_bytes(v: &mut [u8]) {