tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: c9a925b7bcd9552f19ba50519c6a49ed7ca61691 commit: 7581495ac82d6cb073609284c7f7186a48021d1e mm: kfence: fix false positives on big endian date: 7 months ago config: s390-randconfig-r113-20231102 (https://download.01.org/0day-ci/archive/20231202/202312020738.7YABe2N2-lkp@xxxxxxxxx/config) compiler: s390-linux-gcc (GCC) 13.2.0 reproduce: (https://download.01.org/0day-ci/archive/20231202/202312020738.7YABe2N2-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/202312020738.7YABe2N2-lkp@xxxxxxxxx/ sparse warnings: (new ones prefixed by >>) >> mm/kfence/core.c:329:34: sparse: sparse: cast to restricted __le64 mm/kfence/core.c:333:34: sparse: sparse: cast to restricted __le64 mm/kfence/core.c:352:21: sparse: sparse: cast to restricted __le64 mm/kfence/core.c:372:21: sparse: sparse: cast to restricted __le64 mm/kfence/core.c:1181:9: sparse: sparse: context imbalance in 'kfence_handle_page_fault' - different lock contexts for basic block vim +329 mm/kfence/core.c 0ce20dd840897b Alexander Potapenko 2021-02-25 318 1ba3cbf3ec3b21 Peng Zhang 2023-04-03 319 static inline void set_canary(const struct kfence_metadata *meta) 0ce20dd840897b Alexander Potapenko 2021-02-25 320 { 0ce20dd840897b Alexander Potapenko 2021-02-25 321 const unsigned long pageaddr = ALIGN_DOWN(meta->addr, PAGE_SIZE); 1ba3cbf3ec3b21 Peng Zhang 2023-04-03 322 unsigned long addr = pageaddr; 1ba3cbf3ec3b21 Peng Zhang 2023-04-03 323 1ba3cbf3ec3b21 Peng Zhang 2023-04-03 324 /* 1ba3cbf3ec3b21 Peng Zhang 2023-04-03 325 * The canary may be written to part of the object memory, but it does 1ba3cbf3ec3b21 Peng Zhang 2023-04-03 326 * not affect it. The user should initialize the object before using it. 1ba3cbf3ec3b21 Peng Zhang 2023-04-03 327 */ 1ba3cbf3ec3b21 Peng Zhang 2023-04-03 328 for (; addr < meta->addr; addr += sizeof(u64)) 1ba3cbf3ec3b21 Peng Zhang 2023-04-03 @329 *((u64 *)addr) = KFENCE_CANARY_PATTERN_U64; 1ba3cbf3ec3b21 Peng Zhang 2023-04-03 330 1ba3cbf3ec3b21 Peng Zhang 2023-04-03 331 addr = ALIGN_DOWN(meta->addr + meta->size, sizeof(u64)); 1ba3cbf3ec3b21 Peng Zhang 2023-04-03 332 for (; addr - pageaddr < PAGE_SIZE; addr += sizeof(u64)) 1ba3cbf3ec3b21 Peng Zhang 2023-04-03 333 *((u64 *)addr) = KFENCE_CANARY_PATTERN_U64; 1ba3cbf3ec3b21 Peng Zhang 2023-04-03 334 } 1ba3cbf3ec3b21 Peng Zhang 2023-04-03 335 :::::: The code at line 329 was first introduced by commit :::::: 1ba3cbf3ec3b21d866436fb46b4bb7bdc38608f9 mm: kfence: improve the performance of __kfence_alloc() and __kfence_free() :::::: TO: Peng Zhang <zhangpeng.00@xxxxxxxxxxxxx> :::::: CC: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki
