Messages in this thread | | | Date | Wed, 27 May 2020 10:04:32 +0800 | From | kbuild test robot <> | Subject | arch/x86/kernel/cpu/mce/dev-mcelog.c:346:2: warning: 'strncpy' output truncated before terminating nul copying 12 bytes from a string of the same length |
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tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 444fc5cde64330661bf59944c43844e7d4c2ccd8 commit: d8ecca4043f2d9d89daab7915eca8c2ec6254d0f x86/mce/dev-mcelog: Dynamically allocate space for machine check records date: 3 months ago config: x86_64-lkp (attached as .config) compiler: gcc-9 (Debian 9.3.0-13) 9.3.0 reproduce (this is a W=1 build): git checkout d8ecca4043f2d9d89daab7915eca8c2ec6254d0f # save the attached .config to linux build tree make W=1 ARCH=x86_64
If you fix the issue, kindly add following tag as appropriate Reported-by: kbuild test robot <lkp@intel.com>
All warnings (new ones prefixed by >>, old ones prefixed by <<):
arch/x86/kernel/cpu/mce/dev-mcelog.c: In function 'dev_mcelog_init_device': >> arch/x86/kernel/cpu/mce/dev-mcelog.c:346:2: warning: 'strncpy' output truncated before terminating nul copying 12 bytes from a string of the same length [-Wstringop-truncation] 346 | strncpy(mcelog->signature, MCE_LOG_SIGNATURE, sizeof(mcelog->signature)); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
vim +/strncpy +346 arch/x86/kernel/cpu/mce/dev-mcelog.c
335 336 static __init int dev_mcelog_init_device(void) 337 { 338 int mce_log_len; 339 int err; 340 341 mce_log_len = max(MCE_LOG_MIN_LEN, num_online_cpus()); 342 mcelog = kzalloc(sizeof(*mcelog) + mce_log_len * sizeof(struct mce), GFP_KERNEL); 343 if (!mcelog) 344 return -ENOMEM; 345 > 346 strncpy(mcelog->signature, MCE_LOG_SIGNATURE, sizeof(mcelog->signature));
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