Re: [PATCH] uml: Replace all non-returning strlcpy with strscpy

[Kees Cook]

On May 30, 2023 8:18:42 PM PDT, kernel test robot <lkp@xxxxxxxxx> wrote:
>Hi Azeem,
>
>kernel test robot noticed the following build errors:
>
>[auto build test ERROR on uml/next]
>[also build test ERROR on uml/fixes wireless-next/main wireless/main linus/master v6.4-rc4 next-20230530]
>[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/Azeem-Shaikh/uml-Replace-all-non-returning-strlcpy-with-strscpy/20230531-004115
>base:   git://git.kernel.org/pub/scm/linux/kernel/git/uml/linux next
>patch link:    https://lore.kernel.org/r/20230530164004.986750-1-azeemshaikh38%40gmail.com
>patch subject: [PATCH] uml: Replace all non-returning strlcpy with strscpy
>config: um-i386_defconfig (https://download.01.org/0day-ci/archive/20230531/202305311135.zGMT1gYR-lkp@xxxxxxxxx/config)
>compiler: gcc-12 (Debian 12.2.0-14) 12.2.0
>reproduce (this is a W=1 build):
>        # https://github.com/intel-lab-lkp/linux/commit/c51d7beb37cfbda321feb3811bbe0e381f804899
>        git remote add linux-review https://github.com/intel-lab-lkp/linux
>        git fetch --no-tags linux-review Azeem-Shaikh/uml-Replace-all-non-returning-strlcpy-with-strscpy/20230531-004115
>        git checkout c51d7beb37cfbda321feb3811bbe0e381f804899
>        # save the config file
>        mkdir build_dir && cp config build_dir/.config
>        make W=1 O=build_dir ARCH=um SUBARCH=i386 olddefconfig
>        make W=1 O=build_dir ARCH=um SUBARCH=i386 SHELL=/bin/bash
>
>If you fix the issue, kindly add following tag where applicable
>| Reported-by: kernel test robot <lkp@xxxxxxxxx>
>| Closes: https://lore.kernel.org/oe-kbuild-all/202305311135.zGMT1gYR-lkp@xxxxxxxxx/
>
>All errors (new ones prefixed by >>):
>
>   arch/um/os-Linux/drivers/tuntap_user.c: In function 'tuntap_open':
>>> arch/um/os-Linux/drivers/tuntap_user.c:149:17: error: implicit declaration of function 'strscpy'; did you mean 'strncpy'? [-Werror=implicit-function-declaration]
>     149 |                 strscpy(ifr.ifr_name, pri->dev_name, sizeof(ifr.ifr_name));
>         |                 ^~~~~~~
>         |                 strncpy
>   cc1: some warnings being treated as errors

Ah, yeah, this is another "not actually in the kernel" cases. Let's ignore this strlcpy for now.

-Keed




-- 
Kees Cook