Merge bitcoin#29869: rpc, bugfix: Enforce maximum value for setmocktime

c2e0489 [rpc, bugfix] Enforce maximum value for setmocktime (dergoegge)

Pull request description:

  The maximum value for our mocktime must be representable in nanoseconds, otherwise we end up with negative values returned from `NodeClock::now()`.

  Found through fuzzing:

  ```
  $ echo "c2V0bW9ja3RpbWVcZTptYf9w/3NldG3///////////////9p////ZP///ymL//////89////Nv9L////////LXkBAABpAA==" | base64 --decode > rpc-8cab9148ab4418ebd1923c213e9d3fe9c9b49b39.crash
  $ FUZZ=rpc ./src/test/fuzz/fuzz rpc-8cab9148ab4418ebd1923c213e9d3fe9c9b49b39.crash
  fuzz_libfuzzer: util/time.cpp:28: static NodeClock::time_point NodeClock::now(): Assertion `ret > 0s' failed.
  ```

ACKs for top commit:
  maflcko:
    re-ACK c2e0489
  brunoerg:
    crACK c2e0489
  glozow:
    ACK c2e0489

Tree-SHA512: d7e237ca37bedd74a6b085fb6e726a142705371044c77488f593f35afe70aeca756fdba86920294b1d322c7a9b2cde9ce4e1b7d410a6ccc1fd7c6f3a6e77200a

src/rpc/node.cpp

@@ -26,6 +26,7 @@
 #include <univalue.h>
 #include <util/any.h>
 #include <util/check.h>
+#include <util/time.h>
 
 #include <stdint.h>
 #ifdef HAVE_MALLOC_INFO
@@ -58,9 +59,11 @@ static RPCHelpMan setmocktime()
     LOCK(cs_main);
 
     const int64_t time{request.params[0].getInt<int64_t>()};
-    if (time < 0) {
-        throw JSONRPCError(RPC_INVALID_PARAMETER, strprintf("Mocktime cannot be negative: %s.", time));
+    constexpr int64_t max_time{Ticks<std::chrono::seconds>(std::chrono::nanoseconds::max())};
+    if (time < 0 || time > max_time) {
+        throw JSONRPCError(RPC_INVALID_PARAMETER, strprintf("Mocktime must be in the range [0, %s], not %s.", max_time, time));
     }
+
     SetMockTime(time);
     const NodeContext& node_context{EnsureAnyNodeContext(request.context)};
     for (const auto& chain_client : node_context.chain_clients) {

test/functional/rpc_uptime.py

@@ -23,7 +23,7 @@ def run_test(self):
         self._test_uptime()
 
     def _test_negative_time(self):
-        assert_raises_rpc_error(-8, "Mocktime cannot be negative: -1.", self.nodes[0].setmocktime, -1)
+        assert_raises_rpc_error(-8, "Mocktime must be in the range [0, 9223372036], not -1.", self.nodes[0].setmocktime, -1)
 
     def _test_uptime(self):
         wait_time = 10