[cris:acpi_pcc_v3_telemetry_ng_V10_on_v7.1 30/35] include/linux/fortify-string.h:746:17: error: call to '__read_overflow' declared with attribute error: detected read beyond size of object (1st parameter)

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/cris/linux.git acpi_pcc_v3_telemetry_ng_V10_on_v7.1
head:   330fae3bb5f8a8b084685e5944f0c7bbb5717d2e
commit: e67a787d5fc392d162d321d38430ce6af039e0fe [30/35] firmware: arm_scmi: Add System Telemetry driver
config: powerpc-allmodconfig (https://download.01.org/0day-ci/archive/20260819/[email protected]/config)
compiler: powerpc64-linux-gcc (GCC) 16.1.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260819/[email protected]/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/[email protected]/

All errors (new ones prefixed by >>):

   In file included from include/linux/string.h:386,
                    from arch/powerpc/include/asm/paca.h:16,
                    from arch/powerpc/include/asm/current.h:13,
                    from include/linux/mutex.h:14,
                    from include/linux/kernfs.h:11,
                    from include/linux/sysfs.h:16,
                    from include/linux/kobject.h:20,
                    from include/linux/cdev.h:5,
                    from drivers/firmware/arm_scmi/scmi_system_telemetry.c:11:
   In function 'memchr_inv',
       inlined from 'copy_struct_to_user' at include/linux/uaccess.h:514:4,
       inlined from 'scmi_tlm_abi_info_get_ioctl' at drivers/firmware/arm_scmi/scmi_system_telemetry.c:264:8:
>> include/linux/fortify-string.h:746:17: error: call to '__read_overflow' declared with attribute error: detected read beyond size of object (1st parameter)
     746 |                 __read_overflow();
         |                 ^~~~~~~~~~~~~~~~~


vim +/__read_overflow +746 include/linux/fortify-string.h

a28a6e860c6cf23 Francis Laniel 2021-02-25  739  
a28a6e860c6cf23 Francis Laniel 2021-02-25  740  void *__real_memchr_inv(const void *s, int c, size_t n) __RENAME(memchr_inv);
281d0c962752fb4 Kees Cook      2022-02-08  741  __FORTIFY_INLINE void *memchr_inv(const void * const POS0 p, int c, size_t size)
a28a6e860c6cf23 Francis Laniel 2021-02-25  742  {
21a2c74b0a2a784 Kees Cook      2023-04-07  743  	const size_t p_size = __struct_size(p);
a28a6e860c6cf23 Francis Laniel 2021-02-25  744  
fa35198f39571bb Kees Cook      2022-09-19  745  	if (__compiletime_lessthan(p_size, size))
a28a6e860c6cf23 Francis Laniel 2021-02-25 @746  		__read_overflow();
a28a6e860c6cf23 Francis Laniel 2021-02-25  747  	if (p_size < size)
3d965b33e40d973 Kees Cook      2023-04-07  748  		fortify_panic(FORTIFY_FUNC_memchr_inv, FORTIFY_READ, p_size, size, NULL);
a28a6e860c6cf23 Francis Laniel 2021-02-25  749  	return __real_memchr_inv(p, c, size);
a28a6e860c6cf23 Francis Laniel 2021-02-25  750  }
a28a6e860c6cf23 Francis Laniel 2021-02-25  751  

:::::: The code at line 746 was first introduced by commit
:::::: a28a6e860c6cf231cf3c5171c75c342adcd00406 string.h: move fortified functions definitions in a dedicated header.

:::::: TO: Francis Laniel <[email protected]>
:::::: CC: Linus Torvalds <[email protected]>

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