poc/harness_isolated_get_backend_name.cpp

#include <cstddef>
#include <cstdint>
#include <executorch/extension/data_loader/buffer_data_loader.h>
#include <executorch/runtime/executor/program.h>
#include <executorch/runtime/platform/runtime.h>

using executorch::extension::BufferDataLoader;
using executorch::runtime::Program;

static bool g_initialized = false;

extern "C" int LLVMFuzzerTestOneInput(const std::uint8_t* data, std::size_t size) {
  if (!g_initialized) { executorch::runtime::runtime_init(); g_initialized = true; }
  if (data == nullptr || size == 0 || size > 32U*1024U*1024U) return 0;
  BufferDataLoader loader(data, size);
  auto program = Program::load(&loader, Program::Verification::InternalConsistency);
  if (program.ok()) {
    auto& p = program.get();
    auto n = p.num_methods();
    for (size_t i = 0; i < n; ++i) {
      auto name = p.get_method_name(i);
      if (name.ok()) {
        auto meta = p.method_meta(name.get());
        if (meta.ok()) {
          auto& m = meta.get();
          size_t nb = m.num_backends();
          for (size_t bi = 0; bi < nb; ++bi) {
            (void)m.get_backend_name(bi);   // ONLY this call - no uses_backend()
          }
        }
      }
    }
  }
  return 0;
}