[PATCH v10 20/20] x86/efi: EFI stub DRTM launch support for Secure Launch

[Ard Biesheuvel]

On Wed, 28 Aug 2024 at 19:09, kernel test robot <lkp at intel.com> wrote:
>
> Hi Ross,
>
> kernel test robot noticed the following build warnings:
>
> [auto build test WARNING on tip/x86/core]
> [also build test WARNING on char-misc/char-misc-testing char-misc/char-misc-next char-misc/char-misc-linus herbert-cryptodev-2.6/master efi/next linus/master v6.11-rc5]
> [cannot apply to herbert-crypto-2.6/master next-20240828]
> [If your patch is applied to the wrong git tree, kindly drop us a note.
> And when submitting patch, we suggest to use '--base' as documented in
> https://git-scm.com/docs/git-format-patch#_base_tree_information]
>
> url:    https://github.com/intel-lab-lkp/linux/commits/Ross-Philipson/Documentation-x86-Secure-Launch-kernel-documentation/20240827-065225
> base:   tip/x86/core
> patch link:    https://lore.kernel.org/r/20240826223835.3928819-21-ross.philipson%40oracle.com
> patch subject: [PATCH v10 20/20] x86/efi: EFI stub DRTM launch support for Secure Launch
> config: i386-randconfig-062-20240828 (https://download.01.org/0day-ci/archive/20240829/202408290030.FEbUhHbr-lkp@intel.com/config)


This is a i386 32-bit build, which makes no sense: this stuff should
just declare 'depends on 64BIT'


> compiler: clang version 18.1.5 (https://github.com/llvm/llvm-project 617a15a9eac96088ae5e9134248d8236e34b91b1)
> reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240829/202408290030.FEbUhHbr-lkp@intel.com/reproduce)
>
> If you fix the issue in a separate patch/commit (i.e. not just a new version of
> the same patch/commit), kindly add following tags
> | Reported-by: kernel test robot <lkp at intel.com>
> | Closes: https://lore.kernel.org/oe-kbuild-all/202408290030.FEbUhHbr-lkp@intel.com/
>
> sparse warnings: (new ones prefixed by >>)
> >> drivers/firmware/efi/libstub/x86-stub.c:945:41: sparse: sparse: non size-preserving pointer to integer cast
>    drivers/firmware/efi/libstub/x86-stub.c:953:65: sparse: sparse: non size-preserving pointer to integer cast
> >> drivers/firmware/efi/libstub/x86-stub.c:980:70: sparse: sparse: non size-preserving integer to pointer cast
>    drivers/firmware/efi/libstub/x86-stub.c:1014:45: sparse: sparse: non size-preserving integer to pointer cast
>
> vim +945 drivers/firmware/efi/libstub/x86-stub.c
>
>    927
>    928  static bool efi_secure_launch_update_boot_params(struct slr_table *slrt,
>    929                                                   struct boot_params *boot_params)
>    930  {
>    931          struct slr_entry_intel_info *txt_info;
>    932          struct slr_entry_policy *policy;
>    933          struct txt_os_mle_data *os_mle;
>    934          bool updated = false;
>    935          int i;
>    936
>    937          txt_info = slr_next_entry_by_tag(slrt, NULL, SLR_ENTRY_INTEL_INFO);
>    938          if (!txt_info)
>    939                  return false;
>    940
>    941          os_mle = txt_os_mle_data_start((void *)txt_info->txt_heap);
>    942          if (!os_mle)
>    943                  return false;
>    944
>  > 945          os_mle->boot_params_addr = (u64)boot_params;
>    946
>    947          policy = slr_next_entry_by_tag(slrt, NULL, SLR_ENTRY_ENTRY_POLICY);
>    948          if (!policy)
>    949                  return false;
>    950
>    951          for (i = 0; i < policy->nr_entries; i++) {
>    952                  if (policy->policy_entries[i].entity_type == SLR_ET_BOOT_PARAMS) {
>    953                          policy->policy_entries[i].entity = (u64)boot_params;
>    954                          updated = true;
>    955                          break;
>    956                  }
>    957          }
>    958
>    959          /*
>    960           * If this is a PE entry into EFI stub the mocked up boot params will
>    961           * be missing some of the setup header data needed for the second stage
>    962           * of the Secure Launch boot.
>    963           */
>    964          if (image) {
>    965                  struct setup_header *hdr = (struct setup_header *)((u8 *)image->image_base +
>    966                                              offsetof(struct boot_params, hdr));
>    967                  u64 cmdline_ptr;
>    968
>    969                  boot_params->hdr.setup_sects = hdr->setup_sects;
>    970                  boot_params->hdr.syssize = hdr->syssize;
>    971                  boot_params->hdr.version = hdr->version;
>    972                  boot_params->hdr.loadflags = hdr->loadflags;
>    973                  boot_params->hdr.kernel_alignment = hdr->kernel_alignment;
>    974                  boot_params->hdr.min_alignment = hdr->min_alignment;
>    975                  boot_params->hdr.xloadflags = hdr->xloadflags;
>    976                  boot_params->hdr.init_size = hdr->init_size;
>    977                  boot_params->hdr.kernel_info_offset = hdr->kernel_info_offset;
>    978                  efi_set_u64_form(boot_params->hdr.cmd_line_ptr, boot_params->ext_cmd_line_ptr,
>    979                                   &cmdline_ptr);
>  > 980                  boot_params->hdr.cmdline_size = strlen((const char *)cmdline_ptr);
>    981          }
>    982
>    983          return updated;
>    984  }
>    985
>
> --
> 0-DAY CI Kernel Test Service
> https://github.com/intel/lkp-tests/wiki
>