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fix(v4.0.0): storage -- what the review of step 6 found

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A block request with fewer than two values on the stack is refused; it
had acted on whatever the stack ring held and stopped the node.

Bare metal: when the kernel's chain takes the place of POST's block RAM
the node's two buffers are emptied, so it no longer holds POST's copy of
a block; and the chain's fast RAM is cleared, so a node cannot read what
was in the kernel's heap.

blocks.c is built with each test under that test's own warnings and
sanitizers; it had been left out of both.  The hosted link cleans its
object directory first: it had linked the withdrawn store_v3.o left there
from the day before.

node.h and DECOMPOSITION.md D-19 no longer describe the message device or
the four registers as current.  MESH.md 8.5 records two findings for
ruling: a node's own copy of a block, and a block read over a node's code.

From a clean build: make -C v4 test, sanitize and hosted-check pass;
amd64, aarch64 and riscv64 boot, POST 538 of 538, same hashes, blocks 1
and 2047 clean at the prompt: logs/20261007-085017, -085254, -085636.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
rajames
2026-10-07 08:58:52 -04:00
co-authored by Claude Opus 5.5
parent 6d90375da7
commit bcfd6556a8
15 changed files with 543 additions and 33 deletions
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v4/tests/test_blocks.c
+11
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@@ -83,6 +83,17 @@ int main(void)
CHECK(ask(V4_REQ_BLOCK_READ, 2050, -1) == V4_BLOCK_REFUSED && ask(V4_REQ_BLOCK_WRITE, 2050, top) == V4_BLOCK_REFUSED, "an address below 0, or at the end, is refused");
CHECK(dev[2 * 1024] == 0x44, "and nothing was written");
/* ---- a request with too little on the stack ---- */
{
unsigned char before = dev[2 * 1024];
v4_cell low = n.mem[0];
v4_dstack_reset(&n.ds);
CHECK(v4_blocks_serve(&n, V4_REQ_BLOCK_READ) && n.ds.depth == 1 && v4_dstack_pop(&n.ds) == V4_BLOCK_REFUSED, "a request with nothing on the stack is refused, and the status is all that is left");
v4_dstack_push(&n.ds, 2050);
CHECK(v4_blocks_serve(&n, V4_REQ_BLOCK_WRITE) && n.ds.depth == 1 && v4_dstack_pop(&n.ds) == V4_BLOCK_REFUSED, "and so is one with a single value");
CHECK(dev[2 * 1024] == before && n.mem[0] == low, "nothing was read or written");
}
/* ---- what v3 wrote ---- */
{
uint8_t *b = blk_get_buffer(2070, 1);