[openeuler:OLK-5.10 3386/3386] include/linux/string.h:290:33: warning: '__builtin_strncpy' specified bound depends on the length of the source argument

[openeuler:OLK-5.10 3386/3386] include/linux/string.h:290:33: warning: '__builtin_strncpy' specified bound depends on the length of the source argument

[kernel test robot]

Hi Weili,

FYI, the error/warning still remains.

tree:   https://gitee.com/openeuler/kernel.git OLK-5.10
head:   69d9543977fd7abe8b555406c7a3e5d64d8292f8
commit: a1666f44c2250f7413e73e2f4c02cb2c01f9e3b0 [3386/3386] crypto: hisilicon/qm - support no-sva feature
config: arm64-randconfig-r054-20251208 (https://download.01.org/0day-ci/archive/20251208/202512082302.Kf4xjvAw-lkp@intel.com/config)
compiler: aarch64-linux-gcc (GCC) 13.4.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251208/202512082302.Kf4xjvAw-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/202512082302.Kf4xjvAw-lkp@intel.com/

All warnings (new ones prefixed by >>):

   In file included from include/linux/bitmap.h:9,
                    from include/linux/cpumask.h:12,
                    from include/linux/smp.h:13,
                    from include/linux/lockdep.h:14,
                    from include/linux/mutex.h:17,
                    from include/linux/kernfs.h:13,
                    from include/linux/sysfs.h:17,
                    from include/linux/kobject.h:21,
                    from include/linux/of.h:17,
                    from include/linux/irqdomain.h:35,
                    from include/linux/acpi.h:13,
                    from drivers/crypto/hisilicon/qm.c:4:
   In function 'strncpy',
       inlined from 'qm_alloc_uacce' at drivers/crypto/hisilicon/qm.c:2755:2:
>> include/linux/string.h:290:33: warning: '__builtin_strncpy' specified bound depends on the length of the source argument [-Wstringop-truncation]
     290 | #define __underlying_strncpy    __builtin_strncpy
         |                                 ^
   include/linux/string.h:300:16: note: in expansion of macro '__underlying_strncpy'
     300 |         return __underlying_strncpy(p, q, size);
         |                ^~~~~~~~~~~~~~~~~~~~
   In function 'strlen',
       inlined from 'qm_alloc_uacce' at drivers/crypto/hisilicon/qm.c:2748:13:
   include/linux/string.h:288:33: note: length computed here
     288 | #define __underlying_strlen     __builtin_strlen
         |                                 ^
   include/linux/string.h:321:24: note: in expansion of macro '__underlying_strlen'
     321 |                 return __underlying_strlen(p);
         |                        ^~~~~~~~~~~~~~~~~~~


vim +/__builtin_strncpy +290 include/linux/string.h

47227d27e2fcb0 Daniel Axtens 2020-06-03  268  
47227d27e2fcb0 Daniel Axtens 2020-06-03  269  #ifdef CONFIG_KASAN
47227d27e2fcb0 Daniel Axtens 2020-06-03  270  extern void *__underlying_memchr(const void *p, int c, __kernel_size_t size) __RENAME(memchr);
47227d27e2fcb0 Daniel Axtens 2020-06-03  271  extern int __underlying_memcmp(const void *p, const void *q, __kernel_size_t size) __RENAME(memcmp);
47227d27e2fcb0 Daniel Axtens 2020-06-03  272  extern void *__underlying_memcpy(void *p, const void *q, __kernel_size_t size) __RENAME(memcpy);
47227d27e2fcb0 Daniel Axtens 2020-06-03  273  extern void *__underlying_memmove(void *p, const void *q, __kernel_size_t size) __RENAME(memmove);
47227d27e2fcb0 Daniel Axtens 2020-06-03  274  extern void *__underlying_memset(void *p, int c, __kernel_size_t size) __RENAME(memset);
47227d27e2fcb0 Daniel Axtens 2020-06-03  275  extern char *__underlying_strcat(char *p, const char *q) __RENAME(strcat);
47227d27e2fcb0 Daniel Axtens 2020-06-03  276  extern char *__underlying_strcpy(char *p, const char *q) __RENAME(strcpy);
47227d27e2fcb0 Daniel Axtens 2020-06-03  277  extern __kernel_size_t __underlying_strlen(const char *p) __RENAME(strlen);
47227d27e2fcb0 Daniel Axtens 2020-06-03  278  extern char *__underlying_strncat(char *p, const char *q, __kernel_size_t count) __RENAME(strncat);
47227d27e2fcb0 Daniel Axtens 2020-06-03  279  extern char *__underlying_strncpy(char *p, const char *q, __kernel_size_t size) __RENAME(strncpy);
47227d27e2fcb0 Daniel Axtens 2020-06-03  280  #else
47227d27e2fcb0 Daniel Axtens 2020-06-03  281  #define __underlying_memchr	__builtin_memchr
47227d27e2fcb0 Daniel Axtens 2020-06-03  282  #define __underlying_memcmp	__builtin_memcmp
47227d27e2fcb0 Daniel Axtens 2020-06-03  283  #define __underlying_memcpy	__builtin_memcpy
47227d27e2fcb0 Daniel Axtens 2020-06-03  284  #define __underlying_memmove	__builtin_memmove
47227d27e2fcb0 Daniel Axtens 2020-06-03  285  #define __underlying_memset	__builtin_memset
47227d27e2fcb0 Daniel Axtens 2020-06-03  286  #define __underlying_strcat	__builtin_strcat
47227d27e2fcb0 Daniel Axtens 2020-06-03  287  #define __underlying_strcpy	__builtin_strcpy
47227d27e2fcb0 Daniel Axtens 2020-06-03  288  #define __underlying_strlen	__builtin_strlen
47227d27e2fcb0 Daniel Axtens 2020-06-03  289  #define __underlying_strncat	__builtin_strncat
47227d27e2fcb0 Daniel Axtens 2020-06-03 @290  #define __underlying_strncpy	__builtin_strncpy
47227d27e2fcb0 Daniel Axtens 2020-06-03  291  #endif
47227d27e2fcb0 Daniel Axtens 2020-06-03  292  

:::::: The code at line 290 was first introduced by commit
:::::: 47227d27e2fcb01a9e8f5958d8997cf47a820afc string.h: fix incompatibility between FORTIFY_SOURCE and KASAN

:::::: TO: Daniel Axtens <dja@axtens.net>
:::::: CC: Linus Torvalds <torvalds@linux-foundation.org>

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki