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20ebbf467d
Combining revisions with only-arch allows specifying that a test only applies to a handful of targets. This allows removing a large amount of repetition in the test suite for tests that do not benefit. The revisions are suboptimal for this for some tests, so they aren't preferred in those cases.
83 lines
2.5 KiB
Rust
83 lines
2.5 KiB
Rust
// revisions: x32 x64
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// run-pass
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//[x32] only-x86
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//[x64] only-x86_64
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// ignore-emscripten no processes
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// ignore-sgx no processes
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// ignore-fuchsia no exception handler registered for segfault
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// ignore-nto Crash analysis impossible at SIGSEGV in QNX Neutrino
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use std::env;
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use std::mem::MaybeUninit;
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use std::process::Command;
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use std::thread;
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#[link(name = "rust_test_helpers", kind = "static")]
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extern "C" {
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#[link_name = "rust_dbg_extern_identity_u64"]
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fn black_box(u: u64);
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}
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fn main() {
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let args = env::args().skip(1).collect::<Vec<_>>();
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if args.len() > 0 {
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match &args[0][..] {
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"main-recurse" => overflow_recurse(),
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"child-recurse" => thread::spawn(overflow_recurse).join().unwrap(),
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"child-frame" => overflow_frame(),
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_ => panic!(),
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}
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return;
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}
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let me = env::current_exe().unwrap();
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// The linux kernel has some different behavior for the main thread because
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// the main thread's stack can typically grow. We can't always guarantee
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// that we report stack overflow on the main thread, see #43052 for some
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// details
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if cfg!(not(target_os = "linux")) {
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assert_overflow(Command::new(&me).arg("main-recurse"));
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}
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assert_overflow(Command::new(&me).arg("child-recurse"));
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assert_overflow(Command::new(&me).arg("child-frame"));
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}
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#[allow(unconditional_recursion)]
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fn recurse(array: &MaybeUninit<[u64; 1024]>) {
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unsafe {
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black_box(array.as_ptr() as u64);
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}
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let local: MaybeUninit<[u64; 1024]> = MaybeUninit::uninit();
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recurse(&local);
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}
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#[inline(never)]
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fn overflow_recurse() {
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recurse(&MaybeUninit::uninit());
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}
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fn overflow_frame() {
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// By using a 1MiB stack frame with only 512KiB stack, we'll jump over any
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// guard page, even with 64K pages -- but stack probes should catch it.
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const STACK_SIZE: usize = 512 * 1024;
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thread::Builder::new().stack_size(STACK_SIZE).spawn(|| {
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let local: MaybeUninit<[u8; 2 * STACK_SIZE]> = MaybeUninit::uninit();
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unsafe {
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black_box(local.as_ptr() as u64);
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}
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}).unwrap().join().unwrap();
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}
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fn assert_overflow(cmd: &mut Command) {
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let output = cmd.output().unwrap();
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assert!(!output.status.success());
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let stdout = String::from_utf8_lossy(&output.stdout);
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let stderr = String::from_utf8_lossy(&output.stderr);
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println!("status: {}", output.status);
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println!("stdout: {}", stdout);
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println!("stderr: {}", stderr);
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assert!(stdout.is_empty());
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assert!(stderr.contains("has overflowed its stack\n"));
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}
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