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kevinveenbirkenbachandClaude Opus 5.5
330b85f9e7
On runner image 20261101 kernel.apparmor_restrict_unprivileged_unconfined is on, so the kernel turns runc's change_onexec into the stack docker-default//&unconfined. docker-default grants no signal to an unconfined peer, and every in-container kill() is denied; run 41743807934 lost four package builds that way (journal: apparmor="DENIED" operation="signal" comm="rsync" signal=usr2). teardown.sh now writes 0 to the sysctl and records the value it found under /run/infinito; restore.sh writes that value back and drops the record. A missing sysctl or one already at 0 is left alone, and a second teardown keeps the first record. CI runs teardown before every deploy, workspace and dns job; dev hosts through make environment-bootstrap. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
120 lines
4.0 KiB
Python
120 lines
4.0 KiB
Python
"""The AppArmor teardown must keep docker-default loaded.
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Run 39332343490 lost 39 swarm jobs: the runner's teardown unloaded every
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profile, and BuildKit then failed each node image RUN step with
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`apparmor failed to apply profile: write .../attr/apparmor/exec: no such file`.
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"""
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from __future__ import annotations
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import subprocess
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import tempfile
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import unittest
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from pathlib import Path
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from utils.cache.files import PROJECT_ROOT
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COMMON = PROJECT_ROOT / "scripts" / "system" / "apparmor" / "common.sh"
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PROFILES = """wg-quick (enforce)
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wg-quick//ip (enforce)
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docker-default (enforce)
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/usr/bin/man (enforce)
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unprivileged_userns (unconfined)
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docker-defaults (complain)
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"""
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class TestRemovableProfiles(unittest.TestCase):
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def test_keeps_docker_default_and_child_profiles(self) -> None:
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result = subprocess.run(
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["bash", "-c", f'source "{COMMON}"; apparmor_removable_profiles'],
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input=PROFILES,
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capture_output=True,
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text=True,
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check=True,
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)
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self.assertEqual(
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[
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"wg-quick",
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"/usr/bin/man",
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"unprivileged_userns",
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"docker-defaults",
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],
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result.stdout.splitlines(),
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)
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def _call(function: str, sysctl: Path, state: Path) -> subprocess.CompletedProcess:
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return subprocess.run(
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[
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"bash",
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"-c",
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f'source "{COMMON}"; {function} "$1" "$2"',
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"-",
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str(sysctl),
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str(state),
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],
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capture_output=True,
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text=True,
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check=False,
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)
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def _value(path: Path) -> str:
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return path.read_text().strip() # nocheck: cache-read - per-test temp file
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class TestUnconfinedRestriction(unittest.TestCase):
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def setUp(self) -> None:
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self._tmp = tempfile.TemporaryDirectory()
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self.addCleanup(self._tmp.cleanup)
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self.sysctl = Path(self._tmp.name) / "apparmor_restrict_unprivileged_unconfined"
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self.state = Path(self._tmp.name) / "run" / "infinito" / "restriction"
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def test_lifting_turns_the_restriction_off(self) -> None:
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self.sysctl.write_text("1\n")
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result = _call("apparmor_lift_unconfined_restriction", self.sysctl, self.state)
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self.assertEqual(result.returncode, 0, result.stderr)
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self.assertEqual(_value(self.sysctl), "0")
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def test_lifting_records_the_previous_value(self) -> None:
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self.sysctl.write_text("1\n")
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_call("apparmor_lift_unconfined_restriction", self.sysctl, self.state)
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self.assertEqual(_value(self.state), "1")
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def test_lifting_an_already_lifted_restriction_records_nothing(self) -> None:
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self.sysctl.write_text("0\n")
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result = _call("apparmor_lift_unconfined_restriction", self.sysctl, self.state)
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self.assertEqual(result.returncode, 0, result.stderr)
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self.assertFalse(self.state.exists())
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def test_a_kernel_without_the_sysctl_is_left_alone(self) -> None:
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result = _call("apparmor_lift_unconfined_restriction", self.sysctl, self.state)
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self.assertEqual(result.returncode, 0, result.stderr)
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self.assertFalse(self.sysctl.exists())
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self.assertFalse(self.state.exists())
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def test_reinstating_restores_the_recorded_value(self) -> None:
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self.sysctl.write_text("1\n")
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_call("apparmor_lift_unconfined_restriction", self.sysctl, self.state)
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result = _call(
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"apparmor_reinstate_unconfined_restriction", self.sysctl, self.state
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)
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self.assertEqual(result.returncode, 0, result.stderr)
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self.assertEqual(_value(self.sysctl), "1")
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self.assertFalse(self.state.exists())
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def test_reinstating_without_a_record_changes_nothing(self) -> None:
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self.sysctl.write_text("0\n")
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result = _call(
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"apparmor_reinstate_unconfined_restriction", self.sysctl, self.state
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)
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self.assertEqual(result.returncode, 0, result.stderr)
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self.assertEqual(_value(self.sysctl), "0")
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if __name__ == "__main__":
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unittest.main()
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