user0/rust
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

implements arc4random_buf shim for freebsd/solarish platforms.

Browse source 
close #3914
This commit is contained in:
David Carlier 2024-09-26 19:32:36 +01:00
parent c361d52a9b
commit f14f72eb34
No known key found for this signature in database
GPG key ID: 8486F847B4B94EF1
2 changed files with 27 additions and 0 deletions
Download patch file Download diff file Expand all files Collapse all files

14
src/tools/miri/src/shims/unix/foreign_items.rs
View file

@ -792,6 +792,20 @@ pub trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
this.gen_random(ptr, len)?;
this.write_scalar(Scalar::from_target_usize(len, this), dest)?;
}
"arc4random_buf" => {
// This function is non-standard but exists with the same signature and
// same behavior (eg never fails) on FreeBSD and Solaris/Illumos.
if !matches!(&*this.tcx.sess.target.os, "freebsd" | "illumos" | "solaris") {
throw_unsup_format!(
"`arc4random_buf` is not supported on {}",
this.tcx.sess.target.os
);
}
let [ptr, len] = this.check_shim(abi, Abi::C { unwind: false}, link_name, args)?;
let ptr = this.read_pointer(ptr)?;
let len = this.read_target_usize(len)?;
this.gen_random(ptr, len)?;
}
"_Unwind_RaiseException" => {
// This is not formally part of POSIX, but it is very wide-spread on POSIX systems.
// It was originally specified as part of the Itanium C++ ABI:

13
src/tools/miri/tests/pass-dep/libc/libc-random.rs
View file

@ -6,6 +6,8 @@ fn main() {
test_getentropy();
#[cfg(not(target_os = "macos"))]
test_getrandom();
#[cfg(any(target_os = "freebsd", target_os = "illumos", target_os = "solaris"))]
test_arc4random_buf();
}
fn test_getentropy() {
@ -61,3 +63,14 @@ fn test_getrandom() {
);
}
}
#[cfg(any(target_os = "freebsd", target_os = "illumos", target_os = "solaris"))]
fn test_arc4random_buf() {
// FIXME: Use declaration from libc once <https://github.com/rust-lang/libc/pull/3944> lands.
extern "C" {
fn arc4random_buf(buf: *mut libc::c_void, size: libc::size_t);
}
let mut buf = [0u8; 5];
unsafe { arc4random_buf(buf.as_mut_ptr() as _, buf.len()) };
assert!(buf != [0u8; 5]);
}