feat: U4 ciphertext page dump tool

- utrw/debug.c: utrw_debug_dump_page(slot,page,offset) — kernel debug-privileged dump of 64B ciphertext + decrypted plaintext hex to serial (PCKC key derive, no capability path) - selftest demo: dump at offset 128 shows plaintext 'deshab utsm sealed memory selftest' vs unrelated ciphertext; SELFTEST PASS (.build_tmp/qemu_serial_u4dump.log)
2026-10-02 14:40:26 +08:00
parent 42fc06439c
commit 7925c09677
12 changed files with 123 additions and 3 deletions
@@ -72,6 +72,15 @@ int utsm_selftest_run(void) {
    }
    log_info("[UTSM] selftest read ok");

+    /* ==== U4: 密文页 dump —— 串口输出密文/明文 hex 对照 ==== */
+    {
+        int dst = utrw_debug_dump_page(cap.segment_slot, 0, 128);
+        if (dst != UTSM_OK) {
+            log_error("[UTSM] selftest cipher dump failed");
+            return dst;
+        }
+    }
+
    /* ==== U2: Slow Path 真分支（EPOCH 刷新 / KEY_MISS 重派生 / POISONED 拒绝） ==== */
    {
        /* 1) EPOCH 过期：伪造 stale cap（epoch=desc->key_epoch+1），slow path 应