Claude
d7b2f6bf54
sk_v4_genesis never wiped its seed or its read-back; sk_v4_drive_arrived
never wiped the proxy's seed after her login; sk_v4_real_zuse_arrived wiped
the seed only on a match. (The logged-in Zuse's own key stays in g_zuse_seed,
by design.)
Option 1: the three use one buffer the identity module owns, g_seeds (seed,
then its read-back), and sk_v4_drive_arrived -- which every drive goes through,
and which alone calls the other two -- runs the drive's handling (now
handle_drive()) and then wipes it, whichever way it went.
sk_v4_identity_seeds() lets the host tests read it.
kernel/tests/test_sk_v4_identity.c, 10 checks, through the real drive-arrival
path: a fake xHCI controller marks a slot attach-pending, the identity code's
idle beat handles it, the real gpt.c reads the stick's table from the RAM disk;
the block layer, signatures, key mint, marker and console faked. Genesis; a
genesis not read back; the proxy logging in; a real Zuse named, then her stick
logging in. Against the code before the wipe: 5 failures (every case's seeds
left). Now: 0. The harness gains fake_disk_bind. Built for amd64, aarch64,
riscv64. #176 done with 2bac2ac8 (the mint).
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_017RzZgrf7V7Zk2iczBXDRbm
43 lines
3.0 KiB
Markdown
43 lines
3.0 KiB
Markdown
# Kernel host tests -- plan and progress (kept current, one line per increment)
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Captain Bob, 2026-11-12: "Build an appropriate test harness! Love the idea." -- for the kernel's own
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C code, so that a defect QEMU cannot provoke (a USB descriptor no emulated device sends, a write that
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fails half-way, a stop that spins) is still tested first and seen to fail. v4 has had this since step
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1 (`make -C v4 test`); the kernel had none.
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## The design (my calls, open to a ruling)
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- **`kernel/tests/`**, one program per kernel source under test: `test_<unit>.c` compiled on the
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host with the kernel's own source file, `-std=c99 -Wall -Wextra -Werror`, and nothing else of the
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kernel. `make -C kernel/tests test` builds and runs them all; each prints `N checks, M failures`
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as v4's do, and the run fails if any does.
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- **Fakes, not mocks** (`kernel/tests/fakes.[ch]`): the console captured line by line (so a test
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reads what the kernel said), a deterministic RNG, and a RAM disk whose reads or writes fail at the
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1 KiB blocks a test chooses -- the disk faults QEMU's blkdebug gives the boots, here per block and
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without a boot.
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- **Code is moved only to be testable, never changed in the move.** Where a unit is buried in a
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larger function (the xHCI configuration-descriptor walk inside the event loop), it is moved out
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into a function of its own in one commit, the boots and the tests unchanged, and then tested.
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- **Not a substitute for acceptance.** The boots stay the only acceptance of the kernel; these run
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beside them. Whether they become a stage of the protocol and the PR's gate (`nightly.sh
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kernel-tests`, after test-32) is **to rule** -- proposed once there are enough tests to matter.
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## Increments
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- [x] 1. The harness (`Makefile`, `harness.h`, `fakes.[ch]`) and `test_gpt.c`: `gpt_read` and
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`gpt_write_one` against a RAM disk -- a valid table; more used entries than `max` (#180); an
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entry out of range past `max` (#180); the first write failing and a later one failing (#168).
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Seen to fail against `gpt.c` as it was before #168 and #180 (`54311be1~1`): 12 checks, 4
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failures -- each of the two defects caught. Now: 0 failures.
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- [x] 2. The xHCI configuration-descriptor walk moved out of the event loop (`usb_config.c`,
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`test_usb_config`), then #170 and #171 tested first (10 failures against the old decision)
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and fixed.
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- [x] 3. #176 (seeds wiped on every exit; option 1, Captain Bob 2026-11-12: "1 is great" -- the
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caller owns the buffer: `test_sk_v4_mint`, 7 failures before; `test_sk_v4_identity`, through the
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real drive-arrival path, 5 failures before). [x] #177 (the fatal stops halt:
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`sk_v4_stop.c`, `test_sk_v4_stop`, a spin seen failing). [x] #178 (the slot array:
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`sk_v4_slots.c`, `test_sk_v4_slots`, 4 failures against the old allocation). [x] #182 (the
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cap checked at compile time: `check_cap`, a 4 TiB cap seen building before).
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- [ ] 4. #179 once #187 is ruled (the block layer's header read).
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- [ ] 5. To rule: the kernel tests as a protocol stage and in the gate.
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