Re: [PATCH] Use strscpy() instead of strcpy()

[kernel test robot <lkp@intel.com>]

Hi Abdul,

kernel test robot noticed the following build errors:

[auto build test ERROR on ceph-client/testing]
[also build test ERROR on ceph-client/for-linus linus/master v6.12-rc7 next-20241112]
[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/Abdul-Rahim/Use-strscpy-instead-of-strcpy/20241112-064257
base:   https://github.com/ceph/ceph-client.git testing
patch link:    https://lore.kernel.org/r/20241111221037.92853-1-abdul.rahim%40myyahoo.com
patch subject: [PATCH] Use strscpy() instead of strcpy()
config: x86_64-rhel-8.3 (https://download.01.org/0day-ci/archive/20241113/202411130853.c11sinW2-lkp@intel.com/config)
compiler: gcc-12 (Debian 12.2.0-14) 12.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20241113/202411130853.c11sinW2-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@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202411130853.c11sinW2-lkp@intel.com/

All errors (new ones prefixed by >>):

   In file included from include/linux/bitfield.h:10,
                    from include/linux/fortify-string.h:5,
                    from include/linux/string.h:390,
                    from include/linux/ceph/ceph_debug.h:7,
                    from fs/ceph/export.c:2:
   fs/ceph/export.c: In function '__get_snap_name':
>> include/linux/build_bug.h:16:51: error: negative width in bit-field '<anonymous>'
      16 | #define BUILD_BUG_ON_ZERO(e) ((int)(sizeof(struct { int:(-!!(e)); })))
         |                                                   ^
   include/linux/compiler.h:243:33: note: in expansion of macro 'BUILD_BUG_ON_ZERO'
     243 | #define __must_be_array(a)      BUILD_BUG_ON_ZERO(__same_type((a), &(a)[0]))
         |                                 ^~~~~~~~~~~~~~~~~
   include/linux/string.h:79:47: note: in expansion of macro '__must_be_array'
      79 |         sized_strscpy(dst, src, sizeof(dst) + __must_be_array(dst) +    \
         |                                               ^~~~~~~~~~~~~~~
   include/linux/args.h:25:24: note: in expansion of macro '__strscpy0'
      25 | #define __CONCAT(a, b) a ## b
         |                        ^
   include/linux/args.h:26:27: note: in expansion of macro '__CONCAT'
      26 | #define CONCATENATE(a, b) __CONCAT(a, b)
         |                           ^~~~~~~~
   include/linux/string.h:113:9: note: in expansion of macro 'CONCATENATE'
     113 |         CONCATENATE(__strscpy, COUNT_ARGS(__VA_ARGS__))(dst, src, __VA_ARGS__)
         |         ^~~~~~~~~~~
   fs/ceph/export.c:455:25: note: in expansion of macro 'strscpy'
     455 |                         strscpy(name, fsc->mount_options->snapdir_name);
         |                         ^~~~~~~


vim +16 include/linux/build_bug.h

bc6245e5efd70c Ian Abbott       2017-07-10   6  
bc6245e5efd70c Ian Abbott       2017-07-10   7  #ifdef __CHECKER__
bc6245e5efd70c Ian Abbott       2017-07-10   8  #define BUILD_BUG_ON_ZERO(e) (0)
bc6245e5efd70c Ian Abbott       2017-07-10   9  #else /* __CHECKER__ */
bc6245e5efd70c Ian Abbott       2017-07-10  10  /*
bc6245e5efd70c Ian Abbott       2017-07-10  11   * Force a compilation error if condition is true, but also produce a
8788994376d84d Rikard Falkeborn 2019-12-04  12   * result (of value 0 and type int), so the expression can be used
bc6245e5efd70c Ian Abbott       2017-07-10  13   * e.g. in a structure initializer (or where-ever else comma expressions
bc6245e5efd70c Ian Abbott       2017-07-10  14   * aren't permitted).
bc6245e5efd70c Ian Abbott       2017-07-10  15   */
8788994376d84d Rikard Falkeborn 2019-12-04 @16  #define BUILD_BUG_ON_ZERO(e) ((int)(sizeof(struct { int:(-!!(e)); })))
527edbc18a70e7 Masahiro Yamada  2019-01-03  17  #endif /* __CHECKER__ */
527edbc18a70e7 Masahiro Yamada  2019-01-03  18  

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