tree: git://git.kernel.org/pub/scm/linux/kernel/git/vbabka/slab.git slab/for-next head: 8acbdbf0106c179801f30bff547e9512889c624d commit: 7f39e23ed8ddd6c49b7a2615037af50881b50206 [1/3] mm/slub: avoid zeroing outside-object freepointer for single free config: x86_64-buildonly-randconfig-002-20240501 (https://download.01.org/0day-ci/archive/20240501/202405011954.GfS77PZb-lkp@xxxxxxxxx/config) compiler: clang version 18.1.4 (https://github.com/llvm/llvm-project e6c3289804a67ea0bb6a86fadbe454dd93b8d855) reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240501/202405011954.GfS77PZb-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/202405011954.GfS77PZb-lkp@xxxxxxxxx/ All errors (new ones prefixed by >>): >> mm/slub.c:2103:11: error: call to undeclared function 'get_info_end'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration] 2103 | inuse = get_info_end(s); | ^ mm/slub.c:2580:15: warning: variable 'partial_slabs' set but not used [-Wunused-but-set-variable] 2580 | unsigned int partial_slabs = 0; | ^ >> mm/slub.c:3731:7: error: call to undeclared function 'freeptr_outside_object'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration] 3731 | !freeptr_outside_object(s)) | ^ 1 warning and 2 errors generated. vim +/get_info_end +2103 mm/slub.c 2061 2062 /* 2063 * Hooks for other subsystems that check memory allocations. In a typical 2064 * production configuration these hooks all should produce no code at all. 2065 * 2066 * Returns true if freeing of the object can proceed, false if its reuse 2067 * was delayed by KASAN quarantine, or it was returned to KFENCE. 2068 */ 2069 static __always_inline 2070 bool slab_free_hook(struct kmem_cache *s, void *x, bool init) 2071 { 2072 kmemleak_free_recursive(x, s->flags); 2073 kmsan_slab_free(s, x); 2074 2075 debug_check_no_locks_freed(x, s->object_size); 2076 2077 if (!(s->flags & SLAB_DEBUG_OBJECTS)) 2078 debug_check_no_obj_freed(x, s->object_size); 2079 2080 /* Use KCSAN to help debug racy use-after-free. */ 2081 if (!(s->flags & SLAB_TYPESAFE_BY_RCU)) 2082 __kcsan_check_access(x, s->object_size, 2083 KCSAN_ACCESS_WRITE | KCSAN_ACCESS_ASSERT); 2084 2085 if (kfence_free(x)) 2086 return false; 2087 2088 /* 2089 * As memory initialization might be integrated into KASAN, 2090 * kasan_slab_free and initialization memset's must be 2091 * kept together to avoid discrepancies in behavior. 2092 * 2093 * The initialization memset's clear the object and the metadata, 2094 * but don't touch the SLAB redzone. 2095 * 2096 * The object's freepointer is also avoided if stored outside the 2097 * object. 2098 */ 2099 if (unlikely(init)) { 2100 int rsize; 2101 unsigned int inuse; 2102 > 2103 inuse = get_info_end(s); 2104 if (!kasan_has_integrated_init()) 2105 memset(kasan_reset_tag(x), 0, s->object_size); 2106 rsize = (s->flags & SLAB_RED_ZONE) ? s->red_left_pad : 0; 2107 memset((char *)kasan_reset_tag(x) + inuse, 0, 2108 s->size - inuse - rsize); 2109 } 2110 /* KASAN might put x into memory quarantine, delaying its reuse. */ 2111 return !kasan_slab_free(s, x, init); 2112 } 2113 -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki
