Re: [PATCH v4 2/4] fanotify: define struct members to hold response decision context

On 2022-08-10 22:28, kernel test robot wrote: > Hi Richard, > > Thank you for the patch! Perhaps something to improve: > > [auto build test WARNING on jack-fs/fsnotify] > [also build test WARNING on pcmoore-audit/next linus/master v5.19 next-20220810] > [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/Richard-Guy-Briggs/fanotif... > base: https://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs.git fsnotify > config: i386-randconfig-a013 (https://download.01.org/0day-ci/archive/20220810/202208102231.qSUdYAdb-lk...) > compiler: clang version 16.0.0 (https://github.com/llvm/llvm-project 5f1c7e2cc5a3c07cbc2412e851a7283c1841f520) > 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/a943676abc023c094f05b45f4d6... > git remote add linux-review https://github.com/intel-lab-lkp/linux > git fetch --no-tags linux-review Richard-Guy-Briggs/fanotify-Allow-user-space-to-pass-back-additional-audit-info/20220810-012825 > git checkout a943676abc023c094f05b45f4d61936c567507a2 > # save the config file > mkdir build_dir && cp config build_dir/.config > COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=i386 SHELL=/bin/bash fs/notify/fanotify/ > > If you fix the issue, kindly add following tag where applicable > Reported-by: kernel test robot <lkp(a)intel.com&gt; > > All warnings (new ones prefixed by >>): > > >> fs/notify/fanotify/fanotify_user.c:325:35: warning: format specifies type 'unsigned long' but the argument has type 'size_t' (aka 'unsigned int') [-Wformat] Interesting. When I "fix" it, my compiler complains: fs/notify/fanotify/fanotify_user.c:324:11: warning: format ‘%u’ expects argument of type ‘unsigned int’, but argument 8 has type ‘size_t’ {aka ‘long unsigned int’} [-Wformat=]

> group, fd, response, info_buf, count); > ^~~~~ > include/linux/printk.h:594:38: note: expanded from macro 'pr_debug' > no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__) > ~~~ ^~~~~~~~~~~ > include/linux/printk.h:131:17: note: expanded from macro 'no_printk' > printk(fmt, ##__VA_ARGS__); \ > ~~~ ^~~~~~~~~~~ > include/linux/printk.h:464:60: note: expanded from macro 'printk' > #define printk(fmt, ...) printk_index_wrap(_printk, fmt, ##__VA_ARGS__) > ~~~ ^~~~~~~~~~~ > include/linux/printk.h:436:19: note: expanded from macro 'printk_index_wrap' > _p_func(_fmt, ##__VA_ARGS__); \ > ~~~~ ^~~~~~~~~~~ > 1 warning generated. > > > vim +325 fs/notify/fanotify/fanotify_user.c > > 312 > 313 static int process_access_response(struct fsnotify_group *group, > 314 struct fanotify_response *response_struct, > 315 const char __user *buf, > 316 size_t count) > 317 { > 318 struct fanotify_perm_event *event; > 319 int fd = response_struct->fd; > 320 u32 response = response_struct->response; > 321 struct fanotify_response_info_header info_hdr; > 322 char *info_buf = NULL; > 323 > 324 pr_debug("%s: group=%p fd=%d response=%u buf=%p size=%lu\n", __func__, > > 325 group, fd, response, info_buf, count); > 326 /* > 327 * make sure the response is valid, if invalid we do nothing and either > 328 * userspace can send a valid response or we will clean it up after the > 329 * timeout > 330 */ > 331 if (response & ~FANOTIFY_RESPONSE_VALID_MASK) > 332 return -EINVAL; > 333 switch (response & FANOTIFY_RESPONSE_ACCESS) { > 334 case FAN_ALLOW: > 335 case FAN_DENY: > 336 break; > 337 default: > 338 return -EINVAL; > 339 } > 340 if ((response & FAN_AUDIT) && !FAN_GROUP_FLAG(group, FAN_ENABLE_AUDIT)) > 341 return -EINVAL; > 342 if (fd < 0) > 343 return -EINVAL; > 344 if (response & FAN_INFO) { > 345 size_t c = count; > 346 const char __user *ib = buf; > 347 > 348 if (c <= 0) > 349 return -EINVAL; > 350 while (c >= sizeof(info_hdr)) { > 351 if (copy_from_user(&info_hdr, ib, sizeof(info_hdr))) > 352 return -EFAULT; > 353 if (info_hdr.pad != 0) > 354 return -EINVAL; > 355 if (c < info_hdr.len) > 356 return -EINVAL; > 357 switch (info_hdr.type) { > 358 case FAN_RESPONSE_INFO_AUDIT_RULE: > 359 break; > 360 case FAN_RESPONSE_INFO_NONE: > 361 default: > 362 return -EINVAL; > 363 } > 364 c -= info_hdr.len; > 365 ib += info_hdr.len; > 366 } > 367 if (c != 0) > 368 return -EINVAL; > 369 /* Simplistic check for now */ > 370 if (count != sizeof(struct fanotify_response_info_audit_rule)) > 371 return -EINVAL; > 372 info_buf = kmalloc(sizeof(struct fanotify_response_info_audit_rule), > 373 GFP_KERNEL); > 374 if (!info_buf) > 375 return -ENOMEM; > 376 if (copy_from_user(info_buf, buf, count)) > 377 return -EFAULT; > 378 } > 379 spin_lock(&group->notification_lock); > 380 list_for_each_entry(event, &group->fanotify_data.access_list, > 381 fae.fse.list) { > 382 if (event->fd != fd) > 383 continue; > 384 > 385 list_del_init(&event->fae.fse.list); > 386 /* finish_permission_event() eats info_buf */ > 387 finish_permission_event(group, event, response_struct, > 388 count, info_buf); > 389 wake_up(&group->fanotify_data.access_waitq); > 390 return 0; > 391 } > 392 spin_unlock(&group->notification_lock); > 393 > 394 return -ENOENT; > 395 } > 396 > > -- > 0-DAY CI Kernel Test Service > https://01.org/lkp > - RGB -- Richard Guy Briggs <rgb(a)redhat.com&gt; Sr. S/W Engineer, Kernel Security, Base Operating Systems Remote, Ottawa, Red Hat Canada IRC: rgb, SunRaycer Voice: +1.647.777.2635, Internal: (81) 32635