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Return EBADF for negative stat file descriptors by youknowdot · Pull Request #9008 · RustPython/RustPython · GitHub
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Return EBADF for negative stat file descriptors #9008

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Merged
youknowone merged 3 commits into from
Oct 9, 2026
Merged

Return EBADF for negative stat file descriptors #9008

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2572c59
Reject negative file descriptors before fstat
youknowdot Oct 8, 2026
30a1e45
Cover negative stat descriptors through the interpreter
youknowdot Oct 8, 2026
b3052bd
Move negative stat regression into the os snippet
youknowdot Oct 9, 2026
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4 changes: 4 additions & 0 deletions crates/host_env/src/fileutils.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -11,6 +11,10 @@ pub use windows::{StatStruct, fstat};

#[cfg(not(windows))]
pub fn fstat(fd: crate::crt_fd::Borrowed<'_>) -> std::io::Result<StatStruct> {
// Unlike a directory fd, fstat accepts no negative descriptor sentinels.
if fd.as_raw() < 0 {
return Err(std::io::Error::from_raw_os_error(libc::EBADF));
}
rustix::fs::fstat(fd).map_err(Into::into)
}

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30 changes: 30 additions & 0 deletions tests/negative_fstat.rs
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@youknowone youknowone Oct 8, 2026

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do not add python test code in rust file

Original file line number Diff line number Diff line change
@@ -0,0 +1,30 @@
#![allow(clippy::tests_outside_test_module)]

#[cfg(unix)]
#[test]
fn stat_rejects_negative_file_descriptors() {
use rustpython::{InterpreterBuilder, InterpreterBuilderExt};

InterpreterBuilder::new()
.init_stdlib()
.interpreter()
.enter(|vm| {
let source = r#"
import errno
import os

for stat in (os.stat, os.fstat):
for fd in (-1, -5, -9, -100, -(2**31)):
try:
stat(fd)
except OSError as exc:
assert exc.errno == errno.EBADF, (stat, fd, exc)
else:
raise AssertionError((stat, fd, 'accepted a negative file descriptor'))
"#;
if let Err(err) = vm.run_simple_string(source) {
vm.print_exception(&err);
panic!("negative descriptor regression failed");
}
});
}
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