include/linux/thread_info.h:259:25: error: call to '__bad_copy_to' declared with attribute error: copy destination size is too small

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

Hi Elizabeth,

FYI, the error/warning still remains.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   5cf80612d3f72c46ad53ef5042b4c609c393122f
commit: c301e1fefc2d6c83a2beb47e9cdd7b59a90b0067 ntsync: No longer depend on BROKEN.
date:   6 weeks ago
config: i386-buildonly-randconfig-002-20250221 (https://download.01.org/0day-ci/archive/20250223/202502230554.IA0tyUeS-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/20250223/202502230554.IA0tyUeS-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/202502230554.IA0tyUeS-lkp@intel.com/

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:888:6:
>> 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

b0377fedb65280 Al Viro   2017-06-29  248  
9dd819a15162f8 Kees Cook 2019-09-25  249  static __always_inline __must_check bool
b0377fedb65280 Al Viro   2017-06-29  250  check_copy_size(const void *addr, size_t bytes, bool is_source)
b0377fedb65280 Al Viro   2017-06-29  251  {
c80d92fbb67b2c Kees Cook 2021-06-17  252  	int sz = __builtin_object_size(addr, 0);
b0377fedb65280 Al Viro   2017-06-29  253  	if (unlikely(sz >= 0 && sz < bytes)) {
b0377fedb65280 Al Viro   2017-06-29  254  		if (!__builtin_constant_p(bytes))
b0377fedb65280 Al Viro   2017-06-29  255  			copy_overflow(sz, bytes);
b0377fedb65280 Al Viro   2017-06-29  256  		else if (is_source)
b0377fedb65280 Al Viro   2017-06-29  257  			__bad_copy_from();
b0377fedb65280 Al Viro   2017-06-29  258  		else
b0377fedb65280 Al Viro   2017-06-29 @259  			__bad_copy_to();
b0377fedb65280 Al Viro   2017-06-29  260  		return false;
b0377fedb65280 Al Viro   2017-06-29  261  	}
6d13de1489b6bf Kees Cook 2019-12-04  262  	if (WARN_ON_ONCE(bytes > INT_MAX))
6d13de1489b6bf Kees Cook 2019-12-04  263  		return false;
b0377fedb65280 Al Viro   2017-06-29  264  	check_object_size(addr, bytes, is_source);
b0377fedb65280 Al Viro   2017-06-29  265  	return true;
b0377fedb65280 Al Viro   2017-06-29  266  }
b0377fedb65280 Al Viro   2017-06-29  267  

:::::: The code at line 259 was first introduced by commit
:::::: b0377fedb6528087ed319b0d054d6ed82240372c copy_{to,from}_user(): consolidate object size checks

:::::: TO: Al Viro <viro@zeniv.linux.org.uk>
:::::: CC: Al Viro <viro@zeniv.linux.org.uk>

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