Two bwrap failures found by live host tasks, both in the
AppArmor profile (not in codex or the worker):
1. deny capability sys_admin (etc.) breaks bwrap at userns
creation: codex-host with the deny list failed, the same
profile with capability, allowed it. codexsvc holds no host
capabilities, so the allow only covers fake-root caps inside
bwrap's own user namespace (scoped, harmless to the host);
network/ptrace/file denies still hold independently.
2. bwrap brings up loopback in its new net namespace via a
NETLINK_ROUTE socket: without network netlink raw, codex
workspace-write fails with 'Failed to bind NETLINK_ROUTE
socket' and no tool runs. And a bare 'deny network raw'
overrides the netlink allow (deny wins over allow), so the
raw deny must name inet/inet6 explicitly (verified by an
isolated netlink bind test under each profile variant).
README correction in the same change: codex workspace-write
does NOT isolate /tmp -- an agent /tmp write lands on host
/tmp (verified). The verified boundary is: own worktree
writable, everything else read-only, /tmp shared.
host
4a78ca1e95