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Fix Yama blocking child-to-parent ptrace #149

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Merged
marti4d merged 2 commits into from
May 13, 2025
Merged

Fix Yama blocking child-to-parent ptrace #149

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1af3e6b
Fix Yama blocking child-to-parent ptrace
marti4d May 7, 2025
9e7d3db
Gate prctl
Jake-Shadle May 12, 2025
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9 changes: 9 additions & 0 deletions tests/common/mod.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -9,6 +9,15 @@ type Error = Box<dyn error::Error + std::marker::Send + std::marker::Sync>;
pub type Result<T> = result::Result<T, Error>;

fn build_command() -> Command {
// Anything that needs to spawn a child will need to give it permission to
// ptrace itself, as Yama LSM will normally only allow a parent to debug
// a child, not the other way around.
#[cfg(target_os = "linux")]
{
let rc = unsafe { libc::prctl(libc::PR_SET_PTRACER, libc::PR_SET_PTRACER_ANY) };
assert_eq!(rc, 0);
}

let mut cmd;
if let Some(binary) = std::env::var_os("TEST_HELPER") {
cmd = Command::new(binary);
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