tree: https://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup.git for-next head: e7fd37ba12170cc414be8b639dfc2c5f7172fac2 commit: e7fd37ba12170cc414be8b639dfc2c5f7172fac2 [8/8] cgroup: avoid copying strings longer than the buffers config: ia64-defconfig (attached as .config) compiler: ia64-linux-gcc (GCC) 7.2.0 reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross git checkout e7fd37ba12170cc414be8b639dfc2c5f7172fac2 # save the attached .config to linux build tree make.cross ARCH=ia64 All warnings (new ones prefixed by >>): kernel/cgroup/cgroup.c: In function 'cgroup_file_name': >> kernel/cgroup/cgroup.c:1400:3: warning: ignoring return value of 'strscpy', declared with attribute warn_unused_result [-Wunused-result] strscpy(buf, cft->name, CGROUP_FILE_NAME_MAX); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ kernel/cgroup/cgroup.c: In function 'init_cgroup_root': kernel/cgroup/cgroup.c:1867:3: warning: ignoring return value of 'strscpy', declared with attribute warn_unused_result [-Wunused-result] strscpy(root->release_agent_path, opts->release_agent, PATH_MAX); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ kernel/cgroup/cgroup.c:1869:3: warning: ignoring return value of 'strscpy', declared with attribute warn_unused_result [-Wunused-result] strscpy(root->name, opts->name, MAX_CGROUP_ROOT_NAMELEN); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ vim +/strscpy +1400 kernel/cgroup/cgroup.c 1388 1389 static char *cgroup_file_name(struct cgroup *cgrp, const struct cftype *cft, 1390 char *buf) 1391 { 1392 struct cgroup_subsys *ss = cft->ss; 1393 1394 if (cft->ss && !(cft->flags & CFTYPE_NO_PREFIX) && 1395 !(cgrp->root->flags & CGRP_ROOT_NOPREFIX)) 1396 snprintf(buf, CGROUP_FILE_NAME_MAX, "%s.%s", 1397 cgroup_on_dfl(cgrp) ? ss->name : ss->legacy_name, 1398 cft->name); 1399 else > 1400 strscpy(buf, cft->name, CGROUP_FILE_NAME_MAX); 1401 return buf; 1402 } 1403 --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
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