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fix(lib): validate localhost port ranges for zero end and inverted ranges - #1860
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SequeI merged 1 commit intoSep 11, 2026
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…nges allow_localhost_port_range only checked start==0, so allow_localhost_port_range(5000, 4000) silently succeeded but expanded to zero Landlock rules on Linux and counted a phantom port on macOS. Similarly, end==0 was accepted though port 0 has no meaning in a range (macOS wildcard is via allow_localhost_port(0)). Add validation for end==0 and end<start in both the builder (allow_localhost_port_range) and mutable (add_localhost_port_range) paths. Add tests for inverted, zero-end, single-port, and valid multi-range cases. Closes nolabs-ai#1856 Signed-off-by: Ayush7614 <ayushknj3@gmail.com>
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Linked Issue
Closes #1856
Summary
CapabilitySet::allow_localhost_port_range(start, end)validated onlystart==0. This allowed:allow_localhost_port_range(5000, 4000)— inverted, expands to zero Landlock rules on Linux (for port in start..=endempty) and counts a phantom port on macOS viasaturating_sub.allow_localhost_port_range(100, 0)—end==0has no defined meaning (macOS wildcard isallow_localhost_port(0)).Fix adds validation for
end==0andend<startin both builder (crates/nono/src/capability.rs:1204) and mutable (crates/nono/src/capability.rs:1401) paths.Agent Disclosure
Generated by AI assistant (Muse Spark via OpenCode). Compared
capability.rs:1204,sandbox/linux.rs:912, andsandbox/macos.rs:561to identify silent misconfiguration. Verified no duplicate open issue. No NEP required — validation tightening only, no new capability type, no breaking change for valid inputs.Test Plan
cargo test -p nono -- test_localhost_port_range --nocapture— 7 passed (including 4 new: rejects_zero_end, rejects_inverted, accepts_single_port_range, accepts_valid_ranges)cargo test -p nono— 822 passed, 0 failedcargo clippy -p nono -- -D warnings -D clippy::unwrap_used— cleancargo fmt --check— cleanChecklist