linux-kernel - Re: [PATCH -next] x86/efi_64: fix a user-memory-access in runtime

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Date:   Tue, 28 Jan 2020 07:29:52 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Qian Cai <cai@....pw>
Cc:     kbuild-all@...ts.01.org, ardb@...nel.org, mingo@...hat.com,
        kasan-dev@...glegroups.com, linux-efi@...r.kernel.org,
        linux-kernel@...r.kernel.org, Qian Cai <cai@....pw>
Subject: Re: [PATCH -next] x86/efi_64: fix a user-memory-access in runtime

Hi Qian,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on next-20200117]
[cannot apply to efi/next v5.5]
[if your patch is applied to the wrong git tree, please drop us a note to help
improve the system. BTW, we also suggest to use '--base' option to specify the
base tree in git format-patch, please see https://stackoverflow.com/a/37406982]

url:    https://github.com/0day-ci/linux/commits/Qian-Cai/x86-efi_64-fix-a-user-memory-access-in-runtime/20200118-171142
base:    de970dffa7d19eae1d703c3534825308ef8d5dec
reproduce:
        # apt-get install sparse
        # sparse version: v0.6.1-153-g47b6dfef-dirty
        make ARCH=x86_64 allmodconfig
        make C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__'

If you fix the issue, kindly add following tag
Reported-by: kbuild test robot <lkp@...el.com>


sparse warnings: (new ones prefixed by >>)

>> arch/x86/platform/efi/efi_64.c:1045:48: sparse: sparse: incorrect type in argument 2 (different address spaces)
>> arch/x86/platform/efi/efi_64.c:1045:48: sparse:    expected void const [noderef] <asn:1> *from
>> arch/x86/platform/efi/efi_64.c:1045:48: sparse:    got union efi_runtime_services_t [usertype] *[usertype] runtime

vim +1045 arch/x86/platform/efi/efi_64.c

  1020	
  1021	efi_status_t __init efi_set_virtual_address_map(unsigned long memory_map_size,
  1022							unsigned long descriptor_size,
  1023							u32 descriptor_version,
  1024							efi_memory_desc_t *virtual_map)
  1025	{
  1026		efi_runtime_services_t runtime;
  1027		efi_status_t status;
  1028		unsigned long flags;
  1029		pgd_t *save_pgd = NULL;
  1030	
  1031		if (efi_is_mixed())
  1032			return efi_thunk_set_virtual_address_map(memory_map_size,
  1033								 descriptor_size,
  1034								 descriptor_version,
  1035								 virtual_map);
  1036	
  1037		if (efi_enabled(EFI_OLD_MEMMAP)) {
  1038			save_pgd = efi_old_memmap_phys_prolog();
  1039			if (!save_pgd)
  1040				return EFI_ABORTED;
  1041		} else {
  1042			efi_switch_mm(&efi_mm);
  1043		}
  1044	
> 1045		if (copy_from_user(&runtime, efi.systab->runtime, sizeof(runtime)))

---
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