test(docker): verify capsh execution chain after PR #715 by Mossaka · Pull Request #1240 · github/gh-aw-firewall

Mossaka · 2026-03-11T17:48:29Z

Summary

Add integration tests verifying the capsh execution chain works correctly after PR fix: eliminate nested bash layer in chroot command execution for Java/.NET #715 eliminated the nested bash layer for Java/.NET compatibility
Tests check CapBnd bitmask for dropped capabilities (CAP_NET_ADMIN, CAP_SYS_CHROOT, CAP_SYS_ADMIN)
Verifies commands run under bash, /proc/self/exe resolves correctly, and special characters work with direct-write approach

Test plan

CI passes all checks (build, lint, unit tests)
Integration tests pass on CI runners (chroot tests)
CapBnd bitmask assertions correctly detect dropped capabilities

Fixes #842

🤖 Generated with Claude Code

Add integration tests verifying the capsh execution chain works correctly after PR #715 eliminated the nested bash layer for Java/.NET compatibility. Tests verify: - CAP_NET_ADMIN, CAP_SYS_CHROOT, CAP_SYS_ADMIN dropped from CapBnd bitmask - iptables, chroot, mount commands fail (capabilities enforced) - Commands run under bash shell (BASH_VERSION set) - /proc/self/exe resolves correctly for python3 (not /bin/bash) - Special characters and pipe chains work with direct-write approach Fixes #842 Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

github-actions · 2026-03-11T17:49:20Z

✅ Coverage Check Passed

Overall Coverage

Metric	Base	PR	Delta
Lines	82.50%	82.64%	📈 +0.14%
Statements	82.50%	82.63%	📈 +0.13%
Functions	82.69%	82.69%	➡️ +0.00%
Branches	74.78%	74.87%	📈 +0.09%

📁 Per-file Coverage Changes (1 files)

File	Lines (Before → After)	Statements (Before → After)
`src/docker-manager.ts`	84.0% → 84.5% (+0.54%)	83.3% → 83.8% (+0.52%)

Coverage comparison generated by scripts/ci/compare-coverage.ts

Copilot

Pull request overview

Adds an integration test to validate the post–PR #715 chroot execution chain (capsh capability dropping + command execution semantics), guarding against regressions in how commands are written/executed inside the chroot script.

Changes:

Introduces a new batched integration test suite that inspects CapBnd and attempts privileged operations (iptables/chroot/mount) to confirm capabilities are dropped.
Adds checks around bash execution, /proc/self/exe resolution, and special-character/pipeline handling under the direct-write approach.

Comments suppressed due to low confidence (1)

tests/integration/chroot-capsh-chain.test.ts:55

The ; echo "exit=$?" suffix makes the batch wrapper’s captured exitCode always 0 (because the subshell’s last command is echo). This also allows false positives (e.g., iptables missing yields a non-zero exit that still looks like a capability drop). Prefer running the command directly and asserting on BatchCommandResult.exitCode (and optionally matching stderr/stdout for Operation not permitted/permission denied to ensure the failure is actually capability-related).

        { name: 'iptables_blocked', command: 'iptables -L 2>&1; echo "exit=$?"' },
        // Verify CAP_SYS_CHROOT (bit 18) is dropped in chroot mode
        { name: 'chroot_blocked', command: 'chroot / /bin/true 2>&1; echo "exit=$?"' },
        // Verify CAP_SYS_ADMIN (bit 21) is dropped - mount should fail
        { name: 'mount_blocked', command: 'mount -t tmpfs tmpfs /tmp/test-mount 2>&1; echo "exit=$?"' },

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Copilot · 2026-03-11T17:52:21Z

tests/integration/chroot-capsh-chain.test.ts

+        // Verify CAP_SYS_ADMIN (bit 21) is dropped - mount should fail
+        { name: 'mount_blocked', command: 'mount -t tmpfs tmpfs /tmp/test-mount 2>&1; echo "exit=$?"' },


mount -t tmpfs tmpfs /tmp/test-mount can fail for reasons unrelated to CAP_SYS_ADMIN (e.g., missing mountpoint), and this test currently only checks exit=.... Create a mountpoint first (e.g., under mktemp -d), attempt the mount, and assert the failure mode is permission-related; also ensure any created directory is cleaned up.

Suggested change

// Verify CAP_SYS_ADMIN (bit 21) is dropped - mount should fail

{ name: 'mount_blocked', command: 'mount -t tmpfs tmpfs /tmp/test-mount 2>&1; echo "exit=$?"' },

// Verify CAP_SYS_ADMIN (bit 21) is dropped - mount should fail due to permissions, not missing mountpoint

{ name: 'mount_blocked', command: 'mount_dir="$(mktemp -d)"; mount -t tmpfs tmpfs "$mount_dir" 2>&1; status="$?"; rmdir "$mount_dir"; echo "exit=$status"' },

Copilot · 2026-03-11T17:52:21Z

tests/integration/chroot-capsh-chain.test.ts

+        // Verify that the process tree doesn't have an extra bash layer
+        // ps should show bash -> capsh -> bash -> command, NOT bash -> capsh -> bash -> bash -> command
+        { name: 'process_tree', command: 'ps -o comm= --ppid $PPID 2>/dev/null || ps -o comm= $PPID 2>/dev/null || echo "ps_unavailable"' },


process_tree is executed in the batch but never asserted on, so it adds runtime/noise without increasing coverage. Either add a test that validates the expected chain (no extra nested bash), or remove this batch command to keep the invocation minimal.

Suggested change

// Verify that the process tree doesn't have an extra bash layer

// ps should show bash -> capsh -> bash -> command, NOT bash -> capsh -> bash -> bash -> command

{ name: 'process_tree', command: 'ps -o comm= --ppid $PPID 2>/dev/null || ps -o comm= $PPID 2>/dev/null || echo "ps_unavailable"' },

Copilot · 2026-03-11T17:52:22Z

tests/integration/chroot-capsh-chain.test.ts

+      if (r.exitCode === 0) {
+        // python3's /proc/self/exe should point to python, not bash
+        expect(r.stdout).toMatch(/python/);
+        expect(r.stdout).not.toMatch(/\/bin\/bash$/);
+      }
+      // Skip if python3 not available
+    });
+


This test silently passes if python3 is unavailable (if (r.exitCode === 0) { ... }). Other integration tests in this suite appear to assume python3 exists (and would fail if it didn’t), so this weakens the signal when running this test file in isolation. Consider asserting r.exitCode === 0 (or explicitly test.skip with a clear condition) so missing python fails loudly.

This issue also appears on line 51 of the same file.

Suggested change

if (r.exitCode === 0) {

// python3's /proc/self/exe should point to python, not bash

expect(r.stdout).toMatch(/python/);

expect(r.stdout).not.toMatch(/\/bin\/bash$/);

}

// Skip if python3 not available

});

expect(r.exitCode).toBe(0);

// python3's /proc/self/exe should point to python, not bash

expect(r.stdout).toMatch(/python/);

expect(r.stdout).not.toMatch(/\/bin\/bash$/);

});

github-actions · 2026-03-11T17:53:09Z

Smoke Test Results

✅ GitHub MCP: #1229 feat(cli): add short flags for frequently used options, #1228 docs: clarify --image-tag behavior with agent-image presets
✅ Playwright: GitHub page title verified ("GitHub · Change is constant...")
✅ File Write: /tmp/gh-aw/agent/smoke-test-claude-22966572545.txt created
✅ Bash Verify: File contents confirmed

Overall: PASS

💥 [THE END] — Illustrated by Smoke Claude for issue #1240

github-actions · 2026-03-11T17:53:18Z

Smoke test results for @Mossaka:

✅ GitHub MCP: Last 2 merged PRs — feat(cli): add short flags for frequently used options #1229 feat(cli): add short flags for frequently used options, docs: clarify --image-tag behavior with agent-image presets #1228 docs: clarify --image-tag behavior with agent-image presets
✅ Playwright: github.com title contains "GitHub"
✅ File write: /tmp/gh-aw/agent/smoke-test-copilot-22966572547.txt created
✅ Bash: file verified via cat

Overall: PASS

📰 BREAKING: Report filed by Smoke Copilot for issue #1240

github-actions · 2026-03-11T17:55:28Z

PRs: feat(cli): add short flags for frequently used options; docs: clarify --image-tag behavior with agent-image presets
GitHub MCP merged PRs: ✅
safeinputs-gh pr list: ✅
Playwright title check: ✅
Tavily search: ❌ (tool unavailable)
File write+cat: ✅
Discussion comment: ✅
Build (npm ci && npm run build): ✅
Overall: FAIL

🔮 The oracle has spoken through Smoke Codex for issue #1240

Copilot AI review requested due to automatic review settings March 11, 2026 17:48

Copilot started reviewing on behalf of Mossaka March 11, 2026 17:49 View session

Mossaka changed the title ~~test(chroot): verify capsh execution chain after PR #715~~ test(docker): verify capsh execution chain after PR #715 Mar 11, 2026

Copilot AI reviewed Mar 11, 2026

View reviewed changes

github-actions bot added the smoke-claude label Mar 11, 2026

github-actions bot added the smoke-copilot label Mar 11, 2026

github-actions bot mentioned this pull request Mar 11, 2026

[agentics] No-Op Runs #1086

Closed

github-actions bot mentioned this pull request Mar 11, 2026

test: expand credential hiding tests to all 14 protected paths #1163

Merged

4 tasks

Mossaka merged commit bca0834 into main Mar 11, 2026
56 of 57 checks passed

Mossaka deleted the fix/034-capsh-execution-chain branch March 11, 2026 18:25

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test(docker): verify capsh execution chain after PR #715#1240

test(docker): verify capsh execution chain after PR #715#1240
Mossaka merged 1 commit intomainfrom
fix/034-capsh-execution-chain

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		// Verify CAP_SYS_ADMIN (bit 21) is dropped - mount should fail
		{ name: 'mount_blocked', command: 'mount -t tmpfs tmpfs /tmp/test-mount 2>&1; echo "exit=$?"' },

	// Verify that the process tree doesn't have an extra bash layer
	// ps should show bash -> capsh -> bash -> command, NOT bash -> capsh -> bash -> bash -> command
	{ name: 'process_tree', command: 'ps -o comm= --ppid $PPID 2>/dev/null \|\| ps -o comm= $PPID 2>/dev/null \|\| echo "ps_unavailable"' },

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