Re: [PATCH v6 28/28] ntsync: No longer depend on BROKEN.

Hi Elizabeth,

kernel test robot noticed the following build errors:

[auto build test ERROR on cdd30ebb1b9f36159d66f088b61aee264e649d7a]

url:    https://github.com/intel-lab-lkp/linux/commits/Elizabeth-Figura/ntsync-Introduce-NTSYNC_IOC_WAIT_ANY/20241210-031155
base:   cdd30ebb1b9f36159d66f088b61aee264e649d7a
patch link:    https://lore.kernel.org/r/20241209185904.507350-29-zfigura%40codeweavers.com
patch subject: [PATCH v6 28/28] ntsync: No longer depend on BROKEN.
config: i386-randconfig-002-20241212 (https://download.01.org/0day-ci/archive/20241212/202412121219.EQhUbN0S-lkp-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org/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/20241212/202412121219.EQhUbN0S-lkp-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org/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 <[email protected]>
| Closes: https://lore.kernel.org/oe-kbuild-all/202412121219.EQhUbN0S-lkp-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org/

All errors (new ones prefixed by >>):

   In file included from include/linux/spinlock.h:60,
                    from include/linux/wait.h:9,
                    from include/linux/wait_bit.h:8,
                    from include/linux/fs.h:6,
                    from drivers/misc/ntsync.c:11:
   In function 'check_copy_size',
       inlined from 'copy_from_user' at include/linux/uaccess.h:207:7,
       inlined from 'setup_wait' at drivers/misc/ntsync.c:903:6:
>> include/linux/thread_info.h:259:25: error: call to '__bad_copy_to' declared with attribute error: copy destination size is too small
     259 |                         __bad_copy_to();
         |                         ^~~~~~~~~~~~~~~


vim +/__bad_copy_to +259 include/linux/thread_info.h

b0377fedb652808 Al Viro   2017-06-29  248  
9dd819a15162f8f Kees Cook 2019-09-25  249  static __always_inline __must_check bool
b0377fedb652808 Al Viro   2017-06-29  250  check_copy_size(const void *addr, size_t bytes, bool is_source)
b0377fedb652808 Al Viro   2017-06-29  251  {
c80d92fbb67b2c8 Kees Cook 2021-06-17  252  	int sz = __builtin_object_size(addr, 0);
b0377fedb652808 Al Viro   2017-06-29  253  	if (unlikely(sz >= 0 && sz < bytes)) {
b0377fedb652808 Al Viro   2017-06-29  254  		if (!__builtin_constant_p(bytes))
b0377fedb652808 Al Viro   2017-06-29  255  			copy_overflow(sz, bytes);
b0377fedb652808 Al Viro   2017-06-29  256  		else if (is_source)
b0377fedb652808 Al Viro   2017-06-29  257  			__bad_copy_from();
b0377fedb652808 Al Viro   2017-06-29  258  		else
b0377fedb652808 Al Viro   2017-06-29 @259  			__bad_copy_to();
b0377fedb652808 Al Viro   2017-06-29  260  		return false;
b0377fedb652808 Al Viro   2017-06-29  261  	}
6d13de1489b6bf5 Kees Cook 2019-12-04  262  	if (WARN_ON_ONCE(bytes > INT_MAX))
6d13de1489b6bf5 Kees Cook 2019-12-04  263  		return false;
b0377fedb652808 Al Viro   2017-06-29  264  	check_object_size(addr, bytes, is_source);
b0377fedb652808 Al Viro   2017-06-29  265  	return true;
b0377fedb652808 Al Viro   2017-06-29  266  }
b0377fedb652808 Al Viro   2017-06-29  267  

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