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A registry entry that is a directory is now served the way the root is:
a synthetic directory listing the real one, dialing the sockets inside
it on walk and recursing into further directories, to max_synth_depth
(8) levels across max_synth_dirs (64) synthetic nodes. That is the
plan9port mntgen shape and the layout zmx now posts under, so a live
session reads at /mnt/9p/zmx/<name>. Before this a directory in the
registry was dialed like a socket and answered EIO for good.
post gains the two entry points the traversal needs: postedDir (the
registry scan, against any directory) and dialPath (a dial by composed
path, no name validation).
Hardening, each from an attack that broke the code:
- BATCH_FORGET carries entries for many owners and puts 0 in the header
nodeid, so routing it by the header dropped all of them: 32 of 64
synthetic slots leaked in one close burst and the subdirectories that
held them answered EIO forever. distributeForgets unpacks the body and
hands each entry to its owner.
- probe() and connectBlocking() copied a caller's path into the kernel
address with no bound: a path past sun_path overran the 110-byte stack
sockaddr (a panic in Debug, silent corruption in ReleaseFast). Both
refuse it now, probe as `.live` so a claim never deletes what it could
not inspect.
- That bound then caught 9proc's own listener, which handed probe() the
whole 108-byte sun_path array instead of the path inside it. The probe
reads `.live` for anything it cannot ask about, so every stale socket
became AlreadyListening and no server could ever take a dead
predecessor's name back. It passes the path now.
Suites: 87/87 root (+7 post/serve attack regressions), 48/48 9ns,
51+88 9ns integration (+4 traversal and slot-recycling checks), 213/0
9ns adversarial, 60/60 9proc plus its adversarial suites with a new
stale-socket takeover check, freestanding green.
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as Tflush
- --name NAME (default derived from the transport: socket basename, tcp-IP-PORT,
spawned command, fdN) mounts at /mnt/9p/<name>; --mount still overrides.
ensureMountpoint walks down and creates missing components, shadowing the
deepest unwritable ancestor. NINE_MOUNT is the only exported variable.
- The inode number reported to the kernel is the 9P qid.path for every node,
root included; a server handing qid.path 1 to a file (Pardes /self) no
longer collides with the root.
- FUSE_INTERRUPT for the request in flight becomes Tflush; a blocked read
returns EINTR when the server answers the flush, chunked transfers return
short counts, other requests arriving meanwhile are stashed and served
next. Servers ignoring Tflush still block until they answer.
- 9ns-test now covers nine/bridge/fuse; new adv_bridge_interrupt suite (28);
9ns-itest grows to 88 checks.
Co-Authored-By: Claude Fable 5.1 <[email protected]>
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Directories, binaries, build options (-D9ns, -D9proc), step names, module
name (9proc), thread and fs names, env var NINEPLAYER_MOUNT -> NINE_MOUNT,
docs and test scripts. Browser assets move to web/static.
Co-Authored-By: Claude Fable 5.1 <[email protected]>
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