Re: [PATCH] rpmsg: strcpy is not safe, use strncpy

[kernel test robot <lkp@xxxxxxxxx>]

Hi Saud,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on v5.19-rc1]
[also build test WARNING on next-20220609]
[cannot apply to remoteproc/rpmsg-next]
[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]

url:    https://github.com/intel-lab-lkp/linux/commits/Saud-Farooqui/rpmsg-strcpy-is-not-safe-use-strncpy/20220609-024555
base:    f2906aa863381afb0015a9eb7fefad885d4e5a56
config: sparc64-randconfig-r026-20220609 (https://download.01.org/0day-ci/archive/20220610/202206100428.A3CCM24E-lkp@xxxxxxxxx/config)
compiler: sparc64-linux-gcc (GCC) 11.3.0
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://github.com/intel-lab-lkp/linux/commit/b6e6a64ab89042911604aa4741584a422cdfe8a5
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Saud-Farooqui/rpmsg-strcpy-is-not-safe-use-strncpy/20220609-024555
        git checkout b6e6a64ab89042911604aa4741584a422cdfe8a5
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.3.0 make.cross W=1 O=build_dir ARCH=sparc64 SHELL=/bin/bash drivers/rpmsg/

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

All warnings (new ones prefixed by >>):

   drivers/rpmsg/rpmsg_core.c: In function 'rpmsg_register_device_override':
>> drivers/rpmsg/rpmsg_core.c:607:17: warning: 'strncpy' specified bound 32 equals destination size [-Wstringop-truncation]
     607 |                 strncpy(rpdev->id.name, driver_override, sizeof(rpdev->id.name));
         |                 ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~


vim +/strncpy +607 drivers/rpmsg/rpmsg_core.c

   595	
   596	/*
   597	 * A helper for registering rpmsg device with driver override and name.
   598	 * Drivers should not be using it, but instead rpmsg_register_device().
   599	 */
   600	int rpmsg_register_device_override(struct rpmsg_device *rpdev,
   601					   const char *driver_override)
   602	{
   603		struct device *dev = &rpdev->dev;
   604		int ret;
   605	
   606		if (driver_override)
 > 607			strncpy(rpdev->id.name, driver_override, sizeof(rpdev->id.name));
   608	
   609		dev_set_name(dev, "%s.%s.%d.%d", dev_name(dev->parent),
   610			     rpdev->id.name, rpdev->src, rpdev->dst);
   611	
   612		dev->bus = &rpmsg_bus;
   613	
   614		device_initialize(dev);
   615		if (driver_override) {
   616			ret = driver_set_override(dev, &rpdev->driver_override,
   617						  driver_override,
   618						  strlen(driver_override));
   619			if (ret) {
   620				dev_err(dev, "device_set_override failed: %d\n", ret);
   621				return ret;
   622			}
   623		}
   624	
   625		ret = device_add(dev);
   626		if (ret) {
   627			dev_err(dev, "device_add failed: %d\n", ret);
   628			kfree(rpdev->driver_override);
   629			rpdev->driver_override = NULL;
   630			put_device(dev);
   631		}
   632	
   633		return ret;
   634	}
   635	EXPORT_SYMBOL(rpmsg_register_device_override);
   636	

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