linux-kernel - drivers/block/aoe/aoenet.c:42:9: warning: 'strncpy' specified bound 1024 equals destination size

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Date:   Mon, 22 Aug 2022 18:00:36 +0800
From:   kernel test robot <lkp@...el.com>
To:     Kefeng Wang <wangkefeng.wang@...wei.com>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org,
        Catalin Marinas <catalin.marinas@....com>
Subject: drivers/block/aoe/aoenet.c:42:9: warning: 'strncpy' specified bound
 1024 equals destination size

Hi Kefeng,

First bad commit (maybe != root cause):

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   1c23f9e627a7b412978b4e852793c5e3c3efc555
commit: dd03762ab608e058c8f390ad9cf667e490089796 arm64: Enable KCSAN
date:   8 months ago
config: arm64-randconfig-r034-20220821 (https://download.01.org/0day-ci/archive/20220822/202208221724.e2TzAhaW-lkp@intel.com/config)
compiler: aarch64-linux-gcc (GCC) 12.1.0
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=dd03762ab608e058c8f390ad9cf667e490089796
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout dd03762ab608e058c8f390ad9cf667e490089796
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=arm64 SHELL=/bin/bash drivers/block/aoe/ drivers/bus/fsl-mc/

If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot <lkp@...el.com>

All warnings (new ones prefixed by >>):

   drivers/block/aoe/aoenet.c: In function 'aoe_iflist_setup':
>> drivers/block/aoe/aoenet.c:42:9: warning: 'strncpy' specified bound 1024 equals destination size [-Wstringop-truncation]
      42 |         strncpy(aoe_iflist, str, IFLISTSZ);
         |         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
--
   drivers/bus/fsl-mc/dprc.c: In function 'dprc_get_obj':
>> drivers/bus/fsl-mc/dprc.c:453:9: warning: 'strncpy' output may be truncated copying 15 bytes from a string of length 15 [-Wstringop-truncation]
     453 |         strncpy(obj_desc->type, rsp_params->type, 16);
         |         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   drivers/bus/fsl-mc/dprc.c:455:9: warning: 'strncpy' output may be truncated copying 15 bytes from a string of length 15 [-Wstringop-truncation]
     455 |         strncpy(obj_desc->label, rsp_params->label, 16);
         |         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   drivers/bus/fsl-mc/dprc.c: In function 'dprc_set_obj_irq':
>> drivers/bus/fsl-mc/dprc.c:494:9: warning: 'strncpy' specified bound 16 equals destination size [-Wstringop-truncation]
     494 |         strncpy(cmd_params->obj_type, obj_type, 16);
         |         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   drivers/bus/fsl-mc/dprc.c: In function 'dprc_get_obj_region':
   drivers/bus/fsl-mc/dprc.c:567:9: warning: 'strncpy' specified bound 16 equals destination size [-Wstringop-truncation]
     567 |         strncpy(cmd_params->obj_type, obj_type, 16);
         |         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~


vim +/strncpy +42 drivers/block/aoe/aoenet.c

eb086ec59667df Ed L. Cashin 2012-10-04  38  
03c41c434775c5 Ed L. Cashin 2005-04-29  39  #ifndef MODULE
03c41c434775c5 Ed L. Cashin 2005-04-29  40  static int __init aoe_iflist_setup(char *str)
03c41c434775c5 Ed L. Cashin 2005-04-29  41  {
03c41c434775c5 Ed L. Cashin 2005-04-29 @42  	strncpy(aoe_iflist, str, IFLISTSZ);
03c41c434775c5 Ed L. Cashin 2005-04-29  43  	aoe_iflist[IFLISTSZ - 1] = '\0';
03c41c434775c5 Ed L. Cashin 2005-04-29  44  	return 1;
03c41c434775c5 Ed L. Cashin 2005-04-29  45  }
03c41c434775c5 Ed L. Cashin 2005-04-29  46  

:::::: The code at line 42 was first introduced by commit
:::::: 03c41c434775c52092d17a5031ad8ebaaf555bc4 [PATCH] aoe: improve allowed interfaces configuration

:::::: TO: Ed L Cashin <ecashin@...aid.com>
:::::: CC: Greg KH <gregkh@...e.de>

-- 
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https://01.org/lkp