code wiki / _hdl_build / _k_r2_001b1_gate.nx
`_k_r2_001b1_gate.nx` source

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1// _k_r2_001b1_gate.nx -- the K-R2-001b1 gate (virtio-MMIO QUEUE-CONFIGURATION REGISTER
2// layer; the smallest first slice of the K-R2-001b virtqueue epic).  Drives the full
3// author->handshake->queue-config chain with NO mocks: runs the REAL nx_virtio_hs_emit (the
4// team AUTHORS the rv64 image + the TABLE-COMPUTED golden transcript from the queue-config
5// spec), then RUNS the image on the SOVEREIGN rv64 emulator (rv64im_min_sim with the
6// rv64im_min_virtio device now carrying the legacy virtqueue-config registers QueueSel /
7// QueueNumMax / QueueNum / QueueAlign / QueuePFN / QueueNotify carved into load32/store32 --
8// the PRIMARY, gating lane: Nishi owns the runtime) and asserts the captured serial
9// transcript CONTAINS the emitter's golden ("VIO ACK DRV FEAT OK VQ\n" -- after the
10// handshake the driver selected virtqueue 0, read QueueNumMax, latched the ring size, bound
11// the guest ring page-frame via QueuePFN, kicked QueueNotify, and READ QueuePFN BACK to
12// confirm the binding) AND the sovereign emu reports a clean SiFive-finisher halt.
13//
14// Then the ALIGNMENT lane: qemu-system-riscv64 -machine virt -global
15// virtio-mmio.force-legacy=true with a REAL virtio-blk-device backing.  qemu fills its
16// virtio-mmio slots in REVERSE (the blk device lands at slot 0x10008000), so the gate
17// authors a SECOND image from a base-rewritten spec and runs THAT on qemu; the SAME driver
18// completes the queue config against the REAL legacy virtio-blk transport (QueuePFN
19// read-back is genuinely RW on the real device) and emits the SAME golden -> lanes AGREE.
20//
21// Finally a TAMPER test: corrupt the QueuePFN-EXPECTED constant in the sovereign image (the
22// driver loads its own QueuePFN read-back into t3 and compares against this li-loaded
23// expected in t4; bumping the expected's immediate makes t3 != t4) -> the read-back verify
24// branches PAST stage 5 straight to the finisher -> the transcript loses ONLY its "VQ\n"
25// canary (the handshake tail survives) -> the gate MUST go RED.  Evidence ->
26// knowledge/status/virtio_blk.log (VQCFGGATE row; the queue row's ||MARK= reads it).
27// Sovereign orchestration (fork/dup3/execve/wait4).  license_tier: ORIGINAL
28import "nx_syscalls.nx"
29
30// the unique rv64 encoding of `lw t3, 0x40(t2)` -- the QueuePFN read-back load.  The
31// QueuePFN-expected constant the driver compares against is the li that follows it (lui
32// at +4, addi at +8); corrupting the addi's immediate is the queue-config tamper.
33const G_QPFN_LOAD_WORD: i64 = 0x0403ae03   // lw t3, 0x040(t2)   (QueuePFN read-back)
34
35func g_p(s: *u8) -> i64 { var n: i64=0; while s[n]!=(0 as u8){n=n+1} sys_write(1,s,n); return 0 }
36func g_fp(fd: i64, s: *u8) -> i64 { var n: i64=0; while s[n]!=(0 as u8){n=n+1} sys_write(fd,s,n); return 0 }
37func g_fn(fd: i64, v: i64) -> i64 { let bb: *u8=sys_mmap(28); var m: i64=v; if m<0{m=0-m}; let t: *u8=sys_mmap(28); var k: i64=0; if m==0{t[0]=48;k=1}; while m>0{t[k]=(48+(m%10)) as u8;m=m/10;k=k+1}; var i: i64=0; while i<k{bb[i]=t[k-1-i];i=i+1}; sys_write(fd,bb,k); return 0 }
38
39// run nx_virtio_hs_emit <spec>; return child wait status (0 = ok)
40func g_run_emit(spec: *u8) -> i64 {
  let pid: i64 = sys_fork()
  if pid == 0 {
      let dn: i64 = sys_openat_wr("/dev/null" as *u8, 0x1a4)
      if dn >= 0 { sys_dup3(dn, 1, 0) }
      let argv: *i64 = sys_mmap(32) as *i64
      argv[0] = "_offc/nx_virtio_hs_emit.elf" as *u8 as i64
      argv[1] = spec as i64
      argv[2] = 0
      let envp: *i64 = sys_mmap(16) as *i64
      envp[0] = "PATH=/usr/bin:/bin" as *u8 as i64
      envp[1] = 0
      sys_execve("_offc/nx_virtio_hs_emit.elf" as *u8, argv, envp)
      sys_exit(127)
  }
  let st: *i64 = sys_mmap(16) as *i64
  sys_wait4(pid, st, 0)
  return st[0]
58}
59
60// run the SOVEREIGN rv64 emulator on binpath; serial -> outpath; return wait status
61func g_run_sov(binpath: *u8, outpath: *u8) -> i64 {
  let pid: i64 = sys_fork()
  if pid == 0 {
      let ofd: i64 = sys_openat_wr(outpath, 0x1a4)
      if ofd >= 0 { sys_dup3(ofd, 1, 0); sys_dup3(ofd, 2, 0) }
      let argv: *i64 = sys_mmap(32) as *i64
      argv[0] = "_offc/nx_boot_run_sov.elf" as *u8 as i64
      argv[1] = binpath as i64
      argv[2] = 0
      let envp: *i64 = sys_mmap(16) as *i64
      envp[0] = "PATH=/usr/bin:/bin" as *u8 as i64
      envp[1] = 0
      sys_execve("_offc/nx_boot_run_sov.elf" as *u8, argv, envp)
      sys_exit(127)
  }
  let st: *i64 = sys_mmap(16) as *i64
  sys_wait4(pid, st, 0)
  return st[0]
79}
80
81// run qemu-system-riscv64 virt + legacy virtio-blk-device on binpath; serial -> outpath.
82func g_run_qemu(binpath: *u8, outpath: *u8, backing: *u8) -> i64 {
  let pid: i64 = sys_fork()
  if pid == 0 {
      let ofd: i64 = sys_openat_wr(outpath, 0x1a4)
      if ofd >= 0 { sys_dup3(ofd, 1, 0); sys_dup3(ofd, 2, 0) }
      let argv: *i64 = sys_mmap(128) as *i64
      argv[0] = "/usr/bin/qemu-system-riscv64" as *u8 as i64
      argv[1] = "-machine" as *u8 as i64
      argv[2] = "virt" as *u8 as i64
      argv[3] = "-global" as *u8 as i64
      argv[4] = "virtio-mmio.force-legacy=true" as *u8 as i64
      argv[5] = "-nographic" as *u8 as i64
      argv[6] = "-bios" as *u8 as i64
      argv[7] = binpath as i64
      argv[8] = "-drive" as *u8 as i64
      argv[9] = "file=/tmp/_vqcfggate_backing.img,if=none,format=raw,id=hd0" as *u8 as i64
      argv[10] = "-device" as *u8 as i64
      argv[11] = "virtio-blk-device,drive=hd0" as *u8 as i64
      argv[12] = 0
      let envp: *i64 = sys_mmap(16) as *i64
      envp[0] = "PATH=/usr/bin:/bin" as *u8 as i64
      envp[1] = 0
      sys_execve("/usr/bin/qemu-system-riscv64" as *u8, argv, envp)
      sys_exit(127)
  }
  let st: *i64 = sys_mmap(16) as *i64
  sys_wait4(pid, st, 0)
  return st[0]
110}
111
112// create a small raw backing file for the qemu virtio-blk device (4 sectors of zeros).
113func g_make_backing(path: *u8) -> i64 {
  let fd: i64 = sys_openat_wr(path, 0x1a4)
  if fd < 0 { return 0 - 1 }
  let z: *u8 = sys_mmap(2048)
  var i: i64 = 0
  while i < 2048 { z[i] = 0 as u8; i = i + 1 }
  sys_write(fd, z, 2048)
  sys_close(fd)
  return 0
122}
123
124// read whole file into buf (cap-1 max); return byte count (0 if absent)
125func g_read(path: *u8, buf: *u8, cap: i64) -> i64 {
  let fd: i64 = sys_openat_rd(path)
  if fd < 0 { return 0 }
  var n: i64 = 0
  var go: i64 = 1
  while go == 1 { let r: i64 = sys_read(fd, (buf as i64 + n) as *u8, cap - 1 - n); if r <= 0 { go = 0 } else { n = n + r } if n >= cap - 1 { go = 0 } }
  sys_close(fd)
  return n
133}
134
135// does buf[0,n) contain pat (length pl)?  1/0
136func g_buf_has(buf: *u8, n: i64, pat: *u8, pl: i64) -> i64 {
  if pl <= 0 { return 0 }
  var i: i64 = 0
  while i + pl <= n {
      var k: i64 = 0
      var hit: i64 = 1
      while k < pl { if buf[i+k] != pat[k] { hit = 0; k = pl } else { k = k + 1 } }
      if hit == 1 { return 1 }
      i = i + 1
  }
  return 0
147}
148
149// read a little-endian 32-bit word from buf at byte offset o.
150func g_w32(buf: *u8, o: i64) -> i64 {
  let b0: i64 = buf[o] as i64
  let b1: i64 = buf[o+1] as i64
  let b2: i64 = buf[o+2] as i64
  let b3: i64 = buf[o+3] as i64
  return b0 | (b1 << 8) | (b2 << 16) | (b3 << 24)
156}
157
158// find the byte offset of the (unique) QueuePFN read-back load word in the image; -1 if
159// absent.  The QueuePFN-expected li the driver compares against is at off+4 (lui) / off+8
160// (addi); the addi's high immediate byte is at off+11.
161func g_find_qpfn_load(buf: *u8, n: i64) -> i64 {
  var o: i64 = 0
  while o + 4 <= n {
      if g_w32(buf, o) == G_QPFN_LOAD_WORD { return o }
      o = o + 4
  }
  return 0 - 1
168}
169
170func g_strlen(s: *u8) -> i64 { var n: i64 = 0; while s[n] != (0 as u8) { n = n + 1 } return n }
171
172// does line [ls,le) of buf begin with key?  1/0
173func g_line_is(buf: *u8, ls: i64, le: i64, key: *u8) -> i64 {
  var k: i64 = 0
  while key[k] != (0 as u8) {
      if ls + k >= le { return 0 }
      if buf[ls + k] != key[k] { return 0 }
      k = k + 1
  }
  return 1
181}
182
183// author the qemu-alignment spec: copy the main spec, but replace the `base ` line value
184// with the qemu blk slot and the `out ` line with the qemu image path.
185func g_write_qemu_spec(mainspec: *u8, derived: *u8, qemu_out: *u8) -> i64 {
  let buf: *u8 = sys_mmap(8192)
  let n: i64 = g_read(mainspec, buf, 8192)
  if n <= 0 { return 0 - 1 }
  let ofd: i64 = sys_openat_wr(derived, 0x1a4)
  if ofd < 0 { return 0 - 1 }
  var ls: i64 = 0
  while ls < n {
      var le: i64 = ls
      var scan: i64 = 1
      while scan == 1 { if le >= n { scan = 0 } else { if buf[le] == (10 as u8) { scan = 0 } else { le = le + 1 } } }
      if g_line_is(buf, ls, le, "base " as *u8) == 1 {
          g_fp(ofd, "base 0x10008000\n" as *u8)
      } else {
          if g_line_is(buf, ls, le, "out " as *u8) == 1 {
              g_fp(ofd, "out " as *u8); g_fp(ofd, qemu_out); g_fp(ofd, "\n" as *u8)
          } else {
              sys_write(ofd, (buf as i64 + ls) as *u8, le - ls)
              g_fp(ofd, "\n" as *u8)
          }
      }
      ls = le + 1
  }
  sys_close(ofd)
  return 0
210}
211
212func main() -> i64 {
  let spec: *u8 = "knowledge/specs/virtio_blk_queuecfg_virt.spec" as *u8
  let binpath: *u8 = "runtime/_hdl_build/_virtio_vqcfg_virt.bin" as *u8
  let goldpath: *u8 = "runtime/_hdl_build/_virtio_vqcfg_virt.bin.gold" as *u8
  let qemu_spec: *u8 = "/tmp/_vqcfggate_qemu.spec" as *u8
  let qemu_bin: *u8 = "/tmp/_vqcfggate_qemu.bin" as *u8
  let backing: *u8 = "/tmp/_vqcfggate_backing.img" as *u8
  let tamper_bin: *u8 = "/tmp/_vqcfggate_tamper.bin" as *u8
  let sov_serial: *u8 = "/tmp/_vqcfggate_sov.txt" as *u8
  let qemu_serial: *u8 = "/tmp/_vqcfggate_qemu.txt" as *u8
  let sov_tamper: *u8 = "/tmp/_vqcfggate_sov_tamper.txt" as *u8
  g_p("=== virtio-MMIO queue-config gate (K-R2-001b1: SOVEREIGN rv64 virtqueue-config registers + qemu virtio-blk alignment) ===\n" as *u8)
224
  let lfd: i64 = sys_openat_append("knowledge/status/virtio_blk.log" as *u8, 0x1a4)
226
  // STEP 1: author the SOVEREIGN image (base 0x10001000) + the golden transcript.
  let est: i64 = g_run_emit(spec)
  if est != 0 {
      g_p("VQCFGGATE verdict=RED reason=emit-failed\n" as *u8)
      if lfd >= 0 { g_fp(lfd, "VQCFGGATE verdict=RED reason=emit-failed\n" as *u8); sys_close(lfd) }
      sys_exit(1); return 1
  }
  let gold: *u8 = sys_mmap(512)
  let gn: i64 = g_read(goldpath, gold, 512)
  gold[gn] = 0 as u8
  if gn <= 0 {
      g_p("VQCFGGATE verdict=RED reason=golden-missing\n" as *u8)
      if lfd >= 0 { g_fp(lfd, "VQCFGGATE verdict=RED reason=golden-missing\n" as *u8); sys_close(lfd) }
      sys_exit(1); return 1
  }
242
  // STEP 2 (PRIMARY): the Nishi sovereign rv64 emulator RUNS the image -- handshake +
  // virtqueue config + QueuePFN read-back -> transcript must CONTAIN the golden.
  let sst: i64 = g_run_sov(binpath, sov_serial)
  let sbuf: *u8 = sys_mmap(65536)
  let sbn: i64 = g_read(sov_serial, sbuf, 65536)
  let trans_ok: i64 = g_buf_has(sbuf, sbn, gold, gn)
  let halt_ok: i64 = g_buf_has(sbuf, sbn, "BOOTSOV verdict=GREEN" as *u8, 21)
  var sov_ok: i64 = 0
  if sst == 0 { if trans_ok == 1 { if halt_ok == 1 { sov_ok = 1 } } }
252
  // STEP 3 (ALIGNMENT): author the qemu-base image (slot 0x10008000) + run qemu with a
  // REAL legacy virtio-blk-device; assert the SAME golden appears (QueuePFN read-back is
  // genuinely RW on the real transport, so the driver's verify passes there too).
  g_make_backing(backing)
  g_write_qemu_spec(spec, qemu_spec, qemu_bin)
  let qest: i64 = g_run_emit(qemu_spec)
  var align: i64 = 0
  if qest == 0 {
      let qst: i64 = g_run_qemu(qemu_bin, qemu_serial, backing)
      let qbuf: *u8 = sys_mmap(65536)
      let qbn: i64 = g_read(qemu_serial, qbuf, 65536)
      let qtrans: i64 = g_buf_has(qbuf, qbn, gold, gn)
      if qst == 0 { if qtrans == 1 { align = 1 } }
  }
267
  // STEP 4 (TAMPER): corrupt the QueuePFN-EXPECTED constant in the sovereign image.  Scan
  // for the unique QueuePFN read-back load word; the expected li the driver compares
  // against is the addi at load+8.  Bump that addi's high immediate byte (load+11) so the
  // expected != the value the driver actually wrote+read-back -> the read-back verify
  // branches to the finisher -> ONLY the "VQ\n" canary drops -> gate MUST go RED.
  let ibuf: *u8 = sys_mmap(8192)
  let ibn: i64 = g_read(binpath, ibuf, 8192)
  let lpos: i64 = g_find_qpfn_load(ibuf, ibn)
  var tamper_built: i64 = 0
  if lpos >= 0 {
      let ebyte: i64 = lpos + 11           // high immediate byte of the expected addi
      ibuf[ebyte] = (ibuf[ebyte] + 1) as u8
      let tfd: i64 = sys_openat_wr(tamper_bin, 0x1a4)
      if tfd >= 0 { sys_write(tfd, ibuf, ibn); sys_close(tfd); tamper_built = 1 }
  }
  var tamper_bites: i64 = 0
  if tamper_built == 1 {
      let tst: i64 = g_run_sov(tamper_bin, sov_tamper)
      let tbuf: *u8 = sys_mmap(65536)
      let tbn: i64 = g_read(sov_tamper, tbuf, 65536)
      let tamper_trans: i64 = g_buf_has(tbuf, tbn, gold, gn)   // golden should now MISS
      if tamper_trans == 0 { tamper_bites = 1 }
  }
291
  g_p("  sovereign_emu=" as *u8)
  if sov_ok == 1 { g_p("GREEN(transcript==golden+clean-halt)" as *u8) } else { g_p("RED" as *u8) }
  g_p(" qemu_align=" as *u8)
  if align == 1 { g_p("yes(real-virtio-blk @0x10008000, QueuePFN read-back)" as *u8) } else { g_p("no" as *u8) }
  g_p(" tamper_bites=" as *u8)
  if tamper_bites == 1 { g_p("yes(QueuePFN-expected corrupt -> VQ drops)\n" as *u8) } else { g_p("no\n" as *u8) }
298
  var pass: i64 = 0
  if sov_ok == 1 { if align == 1 { if tamper_bites == 1 { pass = 1 } } }
301
  if pass == 1 {
      g_p("VQCFGGATE verdict=GREEN (sovereign rv64 emu drove the virtqueue-config layer; QueueSel/QueueNumMax/QueueNum/QueuePFN/QueueNotify; QueuePFN read-back verified; transcript==golden; clean halt; qemu virtio-blk-device cross-check AGREES; QueuePFN tamper REJECTED)\n" as *u8)
      if lfd >= 0 {
          g_fp(lfd, "VQCFGGATE verdict=GREEN runtime=sovereign-emu transport=legacy-virtio-mmio layer=queue-config queues=QueueSel|QueueNumMax|QueueNum|QueueAlign|QueuePFN|QueueNotify queuepfn-readback=verified transcript==golden align_qemu=yes(virtio-blk-device) tamper=rejected golden=" as *u8)
          g_fp(lfd, gold)
          g_fp(lfd, " epoch=" as *u8); g_fn(lfd, sys_now_realtime_sec()); g_fp(lfd, "\n" as *u8); sys_close(lfd)
      }
      sys_exit(0); return 0
  }
  g_p("VQCFGGATE verdict=RED (sov_ok/align/tamper not all green)\n" as *u8)
  if lfd >= 0 {
      g_fp(lfd, "VQCFGGATE verdict=RED sov_ok=" as *u8); g_fn(lfd, sov_ok)
      g_fp(lfd, " align=" as *u8); g_fn(lfd, align)
      g_fp(lfd, " tamper_bites=" as *u8); g_fn(lfd, tamper_bites); g_fp(lfd, "\n" as *u8); sys_close(lfd)
  }
  sys_exit(1)
  return 1
319}
_k_r2_001b1_gate.nx source

`_k_r2_001b1_gate.nx` source
