linux-kernel - [kees:for-next/lkdtm 6/6] drivers/misc/lkdtm/cfi.c:62:37: warning: cast from pointer to integer of different size

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Message-ID: <202204170710.LwCV5Ec0-lkp@intel.com>
Date:   Sun, 17 Apr 2022 07:26:33 +0800
From:   kernel test robot <lkp@...el.com>
To:     Kees Cook <keescook@...omium.org>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org,
        Dan Li <ashimida@...ux.alibaba.com>
Subject: [kees:for-next/lkdtm 6/6] drivers/misc/lkdtm/cfi.c:62:37: warning:
 cast from pointer to integer of different size

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/kees/linux.git for-next/lkdtm
head:   2e53b877dc1258d4ac3de98f496bb88ec3bf5e25
commit: 2e53b877dc1258d4ac3de98f496bb88ec3bf5e25 [6/6] lkdtm: Add CFI_BACKWARD to test ROP mitigations
config: sparc-randconfig-r026-20220417 (https://download.01.org/0day-ci/archive/20220417/202204170710.LwCV5Ec0-lkp@intel.com/config)
compiler: sparc-linux-gcc (GCC) 11.2.0
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://git.kernel.org/pub/scm/linux/kernel/git/kees/linux.git/commit/?id=2e53b877dc1258d4ac3de98f496bb88ec3bf5e25
        git remote add kees https://git.kernel.org/pub/scm/linux/kernel/git/kees/linux.git
        git fetch --no-tags kees for-next/lkdtm
        git checkout 2e53b877dc1258d4ac3de98f496bb88ec3bf5e25
        # save the config file to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross O=build_dir ARCH=sparc SHELL=/bin/bash drivers/misc/lkdtm/

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

All warnings (new ones prefixed by >>):

   drivers/misc/lkdtm/cfi.c: In function 'set_return_addr_unchecked':
>> drivers/misc/lkdtm/cfi.c:62:37: warning: cast from pointer to integer of different size [-Wpointer-to-int-cast]
      62 |         ((__force __typeof__(addr))((__force u64)(addr) | PAGE_OFFSET))
         |                                     ^
   drivers/misc/lkdtm/cfi.c:72:13: note: in expansion of macro 'no_pac_addr'
      72 |         if (no_pac_addr(*ret_addr) == expected)
         |             ^~~~~~~~~~~
>> drivers/misc/lkdtm/cfi.c:62:10: warning: cast to pointer from integer of different size [-Wint-to-pointer-cast]
      62 |         ((__force __typeof__(addr))((__force u64)(addr) | PAGE_OFFSET))
         |          ^
   drivers/misc/lkdtm/cfi.c:72:13: note: in expansion of macro 'no_pac_addr'
      72 |         if (no_pac_addr(*ret_addr) == expected)
         |             ^~~~~~~~~~~
   drivers/misc/lkdtm/cfi.c: In function 'set_return_addr':
>> drivers/misc/lkdtm/cfi.c:62:37: warning: cast from pointer to integer of different size [-Wpointer-to-int-cast]
      62 |         ((__force __typeof__(addr))((__force u64)(addr) | PAGE_OFFSET))
         |                                     ^
   drivers/misc/lkdtm/cfi.c:87:13: note: in expansion of macro 'no_pac_addr'
      87 |         if (no_pac_addr(*ret_addr) == expected)
         |             ^~~~~~~~~~~
>> drivers/misc/lkdtm/cfi.c:62:10: warning: cast to pointer from integer of different size [-Wint-to-pointer-cast]
      62 |         ((__force __typeof__(addr))((__force u64)(addr) | PAGE_OFFSET))
         |          ^
   drivers/misc/lkdtm/cfi.c:87:13: note: in expansion of macro 'no_pac_addr'
      87 |         if (no_pac_addr(*ret_addr) == expected)
         |             ^~~~~~~~~~~


vim +62 drivers/misc/lkdtm/cfi.c

    60	
    61	#define no_pac_addr(addr)      \
  > 62		((__force __typeof__(addr))((__force u64)(addr) | PAGE_OFFSET))
    63	

-- 
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https://01.org/lkp