The plan is the only progress view from a plain main checkout, and the work
lands on a feature branch that reaches main a group at a time — so between
merges the file said less than was true. It now opens with where the work
is, which branch carries it, and what main itself holds, refreshed on main
after every phase rather than at merges alone.
A new user-memory module owns every kernel touch of a user buffer:
copyFromUser, the new copyToUser, and the resolve behind both. The walk
accumulates the U/S and writable bits down all four levels with the MMU's
own AND rule — folding a 2 MiB leaf in before it resolves and refusing a
1 GiB leaf outright — so a copy honours what ring 3 itself would be
allowed, closing the presence-only trust model the IPC layer carried since
bring-up. It then confirms the frame is physmap-backed, because that is how
the copy reaches it: an mmio_map'd BAR passes the permission walk and would
otherwise fault ring 0 on an alias the physmap never mapped, on the IPC path
as much as the new one.
The nine stragglers that dereferenced user pointers raw now route through
it, so a bad pointer returns -EFAULT where it used to fault the kernel.
The write direction restructures its callees around kernel bounce buffers:
scheduler and devices-broker enumerate from a slot cursor (a task exiting
between chunks can neither duplicate nor lose an entry), klog_read drains
the ring in chunks, and fs_node stages headers and names contiguously.
fs_resolve copies out before installing the endpoint handle, so a faulting
copy cannot strand a capability; its out-capacity bound no longer adds an
unbounded ring-3 length to the base, which wrapped and trapped the kernel's
own overflow check. debug_write reads the caller's message once.
Suite 107/107 (new user-memory case: seven bad pointers refused, each
paired with a sound call that must still succeed).
/etc/init.csv and /etc/devices.csv become /system/configuration/*.csv (the
repo's etc/ moves to system/configuration/, mirroring the runtime tree),
/var/log becomes /system/logs, and /mnt/usb becomes /volumes/usb. The
kernel VFS gains a carve-out so FAT may serve exactly /system/configuration
and /system/logs beneath the initrd-backed /system while /system and /test
themselves stay unshadowable; FAT's single /var mount splits into those two
rewritten mounts. The kvfs readdir check learns /system's third child and
the ramdisk spawn sweep skips the configuration tree.
Suite 106/106.
The /loop work list for the committed design set: Phase 0 baseline, PM
(unix-path flag-day), H1 copy discipline, P1 envelope + Channel, P2
registry + ServiceId retirement, P3 open grants, P4a-c protocol rebase,
H2 SMEP, HS sysret guard, H3 SMAP. Ten settled decisions from the
2026-07-31 grounding pass, two corrected on review: every packet carries
the envelope header folded (headerless events rejected), and bind/open
authorization is chain-attested identity (name alone rejected — ungated
spawn makes it a confused deputy). smep-smap.md gains the verified
straggler table: nine syscalls, klog_status the ninth, with the
callee-writer restructuring notes.
Daniel Samson