Messages in this thread | | | Date | Sat, 16 Sep 2023 04:42:35 +0800 | From | kernel test robot <> | Subject | include/linux/kasan-checks.h:38:27: warning: 'space_args' may be used uninitialized |
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tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 9fdfb15a3dbf818e06be514f4abbfc071004cbe7 commit: 5aa4ac64e6add3e40d5049e31275b2822daf885d LoongArch: Add KASAN (Kernel Address Sanitizer) support date: 9 days ago config: loongarch-randconfig-002-20230916 (https://download.01.org/0day-ci/archive/20230916/202309160440.jECtzdr6-lkp@intel.com/config) compiler: loongarch64-linux-gcc (GCC) 13.2.0 reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20230916/202309160440.jECtzdr6-lkp@intel.com/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@intel.com> | Closes: https://lore.kernel.org/oe-kbuild-all/202309160440.jECtzdr6-lkp@intel.com/
Note: it may well be a FALSE warning. FWIW you are at least aware of it now. http://gcc.gnu.org/wiki/Better_Uninitialized_Warnings
All warnings (new ones prefixed by >>):
In file included from include/asm-generic/rwonce.h:26, from ./arch/loongarch/include/generated/asm/rwonce.h:1, from include/linux/compiler.h:246, from include/linux/export.h:5, from include/linux/linkage.h:7, from include/linux/kernel.h:17, from fs/btrfs/ioctl.c:6: In function 'instrument_copy_from_user_before', inlined from '_copy_from_user' at include/linux/uaccess.h:148:3, inlined from 'copy_from_user' at include/linux/uaccess.h:183:7, inlined from 'btrfs_ioctl_space_info' at fs/btrfs/ioctl.c:2993:6: >> include/linux/kasan-checks.h:38:27: warning: 'space_args' may be used uninitialized [-Wmaybe-uninitialized] 38 | #define kasan_check_write __kasan_check_write include/linux/instrumented.h:129:9: note: in expansion of macro 'kasan_check_write' 129 | kasan_check_write(to, n); | ^~~~~~~~~~~~~~~~~ include/linux/kasan-checks.h: In function 'btrfs_ioctl_space_info': include/linux/kasan-checks.h:20:6: note: by argument 1 of type 'const volatile void *' to '__kasan_check_write' declared here 20 | bool __kasan_check_write(const volatile void *p, unsigned int size); | ^~~~~~~~~~~~~~~~~~~ fs/btrfs/ioctl.c:2975:39: note: 'space_args' declared here 2975 | struct btrfs_ioctl_space_args space_args; | ^~~~~~~~~~
vim +/space_args +38 include/linux/kasan-checks.h
7d8ad890dad00f Marco Elver 2019-07-11 31 7d8ad890dad00f Marco Elver 2019-07-11 32 /* 7d8ad890dad00f Marco Elver 2019-07-11 33 * kasan_check_*: Only available when the particular compilation unit has KASAN 7d8ad890dad00f Marco Elver 2019-07-11 34 * instrumentation enabled. May be used in header files. 7d8ad890dad00f Marco Elver 2019-07-11 35 */ 7d8ad890dad00f Marco Elver 2019-07-11 36 #ifdef __SANITIZE_ADDRESS__ 7d8ad890dad00f Marco Elver 2019-07-11 37 #define kasan_check_read __kasan_check_read 7d8ad890dad00f Marco Elver 2019-07-11 @38 #define kasan_check_write __kasan_check_write 64f8ebaf115bcd Andrey Ryabinin 2016-05-20 39 #else b5f6e0fc7d60e0 Marco Elver 2019-07-11 40 static inline bool kasan_check_read(const volatile void *p, unsigned int size) b5f6e0fc7d60e0 Marco Elver 2019-07-11 41 { b5f6e0fc7d60e0 Marco Elver 2019-07-11 42 return true; b5f6e0fc7d60e0 Marco Elver 2019-07-11 43 } b5f6e0fc7d60e0 Marco Elver 2019-07-11 44 static inline bool kasan_check_write(const volatile void *p, unsigned int size) b5f6e0fc7d60e0 Marco Elver 2019-07-11 45 { b5f6e0fc7d60e0 Marco Elver 2019-07-11 46 return true; b5f6e0fc7d60e0 Marco Elver 2019-07-11 47 } 64f8ebaf115bcd Andrey Ryabinin 2016-05-20 48 #endif 64f8ebaf115bcd Andrey Ryabinin 2016-05-20 49
:::::: The code at line 38 was first introduced by commit :::::: 7d8ad890dad00f6cd64bfb44d9be4fceb10cf819 mm/kasan: introduce __kasan_check_{read,write}
:::::: TO: Marco Elver <elver@google.com> :::::: CC: Linus Torvalds <torvalds@linux-foundation.org>
-- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki
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