Hi Chen, kernel test robot noticed the following build errors: [auto build test ERROR on axboe-block/for-next] [also build test ERROR on linus/master v6.17-rc4 next-20250904] [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/Chen-Yufeng/Sanitize-set_task_ioprio-permission-checks/20250904-112027 base: https://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux-block.git for-next patch link: https://lore.kernel.org/r/20250904031312.887-1-chenyufeng%40iie.ac.cn patch subject: [PATCH] Sanitize set_task_ioprio() permission checks config: x86_64-allnoconfig (https://download.01.org/0day-ci/archive/20250905/202509050122.1DzOHKji-lkp@xxxxxxxxx/config) compiler: clang version 20.1.8 (https://github.com/llvm/llvm-project 87f0227cb60147a26a1eeb4fb06e3b505e9c7261) reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250905/202509050122.1DzOHKji-lkp@xxxxxxxxx/reproduce) If you fix the issue in a separate patch/commit (i.e. not just a new version of the same patch/commit), kindly add following tags | Reported-by: kernel test robot <lkp@xxxxxxxxx> | Closes: https://lore.kernel.org/oe-kbuild-all/202509050122.1DzOHKji-lkp@xxxxxxxxx/ All errors (new ones prefixed by >>): >> block/blk-ioc.c:249:7: error: call to undeclared function 'ptrace_may_access'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration] 249 | if (!ptrace_may_access(task, PTRACE_MODE_READ_REALCREDS)) { | ^ >> block/blk-ioc.c:249:31: error: use of undeclared identifier 'PTRACE_MODE_READ_REALCREDS' 249 | if (!ptrace_may_access(task, PTRACE_MODE_READ_REALCREDS)) { | ^ 2 errors generated. vim +/ptrace_may_access +249 block/blk-ioc.c 243 244 int set_task_ioprio(struct task_struct *task, int ioprio) 245 { 246 int err; 247 248 rcu_read_lock(); > 249 if (!ptrace_may_access(task, PTRACE_MODE_READ_REALCREDS)) { 250 rcu_read_unlock(); 251 return -EPERM; 252 } 253 rcu_read_unlock(); 254 255 err = security_task_setioprio(task, ioprio); 256 if (err) 257 return err; 258 259 task_lock(task); 260 if (unlikely(!task->io_context)) { 261 struct io_context *ioc; 262 263 task_unlock(task); 264 265 ioc = alloc_io_context(GFP_ATOMIC, NUMA_NO_NODE); 266 if (!ioc) 267 return -ENOMEM; 268 269 task_lock(task); 270 if (task->flags & PF_EXITING) { 271 kmem_cache_free(iocontext_cachep, ioc); 272 goto out; 273 } 274 if (task->io_context) 275 kmem_cache_free(iocontext_cachep, ioc); 276 else 277 task->io_context = ioc; 278 } 279 task->io_context->ioprio = ioprio; 280 out: 281 task_unlock(task); 282 return 0; 283 } 284 EXPORT_SYMBOL_GPL(set_task_ioprio); 285 -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki
