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// revisions: x32 x64
// run-pass
//[x32] only-x86
//[x64] only-x86_64
// ignore-emscripten no processes
// ignore-sgx no processes
// ignore-fuchsia no exception handler registered for segfault
// ignore-nto Crash analysis impossible at SIGSEGV in QNX Neutrino
use std::env;
use std::mem::MaybeUninit;
use std::process::Command;
use std::thread;
#[link(name = "rust_test_helpers", kind = "static")]
extern "C" {
#[link_name = "rust_dbg_extern_identity_u64"]
fn black_box(u: u64);
}
fn main() {
let args = env::args().skip(1).collect::<Vec<_>>();
if args.len() > 0 {
match &args[0][..] {
"main-recurse" => overflow_recurse(),
"child-recurse" => thread::spawn(overflow_recurse).join().unwrap(),
"child-frame" => overflow_frame(),
_ => panic!(),
}
return;
}
let me = env::current_exe().unwrap();
// The linux kernel has some different behavior for the main thread because
// the main thread's stack can typically grow. We can't always guarantee
// that we report stack overflow on the main thread, see #43052 for some
// details
if cfg!(not(target_os = "linux")) {
assert_overflow(Command::new(&me).arg("main-recurse"));
}
assert_overflow(Command::new(&me).arg("child-recurse"));
assert_overflow(Command::new(&me).arg("child-frame"));
}
#[allow(unconditional_recursion)]
fn recurse(array: &MaybeUninit<[u64; 1024]>) {
unsafe {
black_box(array.as_ptr() as u64);
}
let local: MaybeUninit<[u64; 1024]> = MaybeUninit::uninit();
recurse(&local);
}
#[inline(never)]
fn overflow_recurse() {
recurse(&MaybeUninit::uninit());
}
fn overflow_frame() {
// By using a 1MiB stack frame with only 512KiB stack, we'll jump over any
// guard page, even with 64K pages -- but stack probes should catch it.
const STACK_SIZE: usize = 512 * 1024;
thread::Builder::new().stack_size(STACK_SIZE).spawn(|| {
let local: MaybeUninit<[u8; 2 * STACK_SIZE]> = MaybeUninit::uninit();
unsafe {
black_box(local.as_ptr() as u64);
}
}).unwrap().join().unwrap();
}
fn assert_overflow(cmd: &mut Command) {
let output = cmd.output().unwrap();
assert!(!output.status.success());
let stdout = String::from_utf8_lossy(&output.stdout);
let stderr = String::from_utf8_lossy(&output.stderr);
println!("status: {}", output.status);
println!("stdout: {}", stdout);
println!("stderr: {}", stderr);
assert!(stdout.is_empty());
assert!(stderr.contains("has overflowed its stack\n"));
}
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