P1: a failed mktemp, mkdir or output redirect now stops the script with
exit 2 before it derives a path, sets a trap or starts anything. The
sandbox root is checked to be absolute, a new empty directory this user
owns and its own physical path, and its device:inode is recorded.
sweep_sandbox and remove_sandbox in scripts/case2/sandbox.sh each refuse
unless the root still matches, so an early, late or empty call gets a
refusal instead of a sweep of the host.
P2: the sweep reads every /proc/<pid>/cwd target with one find and
compares it as a string, root or root plus "/", so *, ? and [ in the
path are literal. A cwd in a deleted directory under the root matches.
P3: a TMPDIR whose tools socket path would pass the 107-byte limit in
packages/seat/src/session.mjs is refused at entry with one line naming
the limit and both lengths. The length comes from the socket path built
on the real sandbox root.
scripts/case2/sandbox-check.sh checks the guard and the match against
dummy symlinks; nothing in it sends a signal.
Remove the R1 slot-controller ties from the C2-14 fixture: the ROW227_CONTROL_ROOT
check, the native permit wait in bindLaunch, the fixture-cleanup.json write, the
priority.mjs preload and the owned-bwrap.sh override. The launcher uses its own bwrap.
The shell runs the driver from an explicit env -i environment (PATH, LANG, a sandbox
HOME, XDG dirs and TMPDIR, MOSAIC_CONFIG, no global git config) as its own process
group. On a signal the driver gets 3 s by the clock, then its group and any process
whose cwd is in the sandbox get SIGKILL, inside the landing gate's 5 s grace.
The fixture credentials are defined only in scripts/case2/fixture-credentials.mjs.
The new scripts/case2/leak-check.mjs reads them from there and never prints them.
Commits the 5 product paths and 7 gate helpers of the row 227 R4 source overlay on top of HEAD 5a0c801cb. scripts/case2/console.mjs is already committed at HEAD and is not part of this commit. The R4 independent review is sha256 6667baaa6af9d6d78a3ec7c64d9f3163ecbc350b94050f62899d9c01deabe002, verdict APPROVE source-only. Packet hashes: PACKET.sha256 4eb60915b2144137df9b5a42afd0c5b266718d71de051fb8be53a27430a2cad4, CURRENT-SOURCE.sha256 0cfd47c2073bc18a3ba7bff1ce6fdf39fe33a64b7fca209be71517b9feb89020. The 12 committed files match the review hash table, the applied overlay JSON (size, mode, hash) and the saved overlay tar. No scripts/test-case2.sh run exists on these bytes.
jason.woltje
Steelbeak