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- Security: Eliminate namespace escape risk by removing `HostBind` and enforcing `FDBind` using pre-opened host socket FDs.
- Security: Replace unsafe `atoi` with `strtol` and strict validation in the C launcher to prevent malformed PID joins.
- Stability: Fix PID wraparound by storing session timestamps in PID files to detect recycled PIDs.
- Stability: Resolve DNS mount leaks by implementing proper unmounting of `/etc/resolv.conf` during tunnel shutdown.
- Performance: Optimize `FDBind` throughput by implementing batch packet processing in the receive loop.
- Deployment: Implement `memfd_create` for the C launcher to support `noexec` temporary directories and reduce disk I/O.
- Maintenance: Replace external `ip` CLI dependency with native `netlink` library for robust network configuration.
- Quality: Fix all `golangci-lint` errors and replace remaining panics with explicit error handling.
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Upgrades several indirect and direct dependencies to their latest safe versions,
successfully resolving 26 dormant vulnerabilities identified by govulncheck.
- Upgraded golang.org/x/crypto from v0.37.0 to v0.52.0 (remediating 13 CVEs)
- Upgraded golang.org/x/net from v0.39.0 to v0.55.0 (remediating 12 CVEs)
- Upgraded golang.org/x/sys from v0.32.0 to v0.45.0 (remediating 1 CVE)
- Upgraded golang.zx2c4.com/wireguard to v0.0.0-20260522210424-ecfc5a8d5446
Ran `go mod tidy` and verified that all unit, integration, and E2E
data-plane tests continue to compile and pass successfully.
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- Implement complete rootless network namespace bootstrap via C launcher using unshare(CLONE_NEWUSER | CLONE_NEWNS | CLONE_NEWNET).
- Resolve unprivileged network isolation blackhole via host-socket preservation (FD passing): open client UDP sockets on the host pre-isolation, clear O_CLOEXEC, and ingest them via custom `FDBind` inside the sandbox.
- Implement isolated routing table automation over `tun0` (addresses, MTU, default routes).
- Implement persistent, multi-process namespace sharing and joining using reference-counted PID files and the setns system call.
- Write robust, self-contained E2E data plane test suites in `tests/e2e/e2e_test.go` using a mock UDP listener.
- Update project documentation (`README.md` and `AGENTS.md`) to reflect completed milestones.
- Ensure 100% test passing rate and zero lint/staticcheck warnings.
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