Messages in this thread | | | Date | Sat, 9 Sep 2023 16:38:52 +0800 | From | kernel test robot <> | Subject | include/linux/fortify-string.h:68:33: warning: '__builtin_strncpy' output truncated copying between 0 and 32 bytes from a string of length 32 |
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Hi Qing,
FYI, the error/warning was bisected to this commit, please ignore it if it's irrelevant.
tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 6099776f9f268e61fe5ecd721f994a8cfce5306f commit: d4c937c2a57bbba24790be6fe7a791456f5fbb60 LoongArch: Add ARCH_HAS_FORTIFY_SOURCE selection date: 4 months ago config: loongarch-allmodconfig (https://download.01.org/0day-ci/archive/20230909/202309091623.TKRBj5X7-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/20230909/202309091623.TKRBj5X7-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/202309091623.TKRBj5X7-lkp@intel.com/
All warnings (new ones prefixed by >>):
In file included from include/linux/string.h:254, from include/linux/bitmap.h:11, from include/linux/cpumask.h:12, from include/linux/mm_types_task.h:14, from include/linux/mm_types.h:5, from include/linux/buildid.h:5, from include/linux/module.h:14, from lib/test_hexdump.c:8: In function 'strncpy', inlined from 'test_hexdump_prepare_test.constprop' at lib/test_hexdump.c:116:3: >> include/linux/fortify-string.h:68:33: warning: '__builtin_strncpy' output truncated copying between 0 and 32 bytes from a string of length 32 [-Wstringop-truncation] 68 | #define __underlying_strncpy __builtin_strncpy | ^ include/linux/fortify-string.h:151:16: note: in expansion of macro '__underlying_strncpy' 151 | return __underlying_strncpy(p, q, size); | ^~~~~~~~~~~~~~~~~~~~ -- In file included from include/linux/string.h:254, from include/linux/bitmap.h:11, from include/linux/cpumask.h:12, from include/linux/mm_types_task.h:14, from include/linux/mm_types.h:5, from include/linux/buildid.h:5, from include/linux/module.h:14, from drivers/nvme/target/core.c:7: In function 'strncpy', inlined from '__assign_req_name' at drivers/nvme/target/trace.h:56:2: >> include/linux/fortify-string.h:68:33: warning: '__builtin_strncpy' specified bound depends on the length of the source argument [-Wstringop-truncation] 68 | #define __underlying_strncpy __builtin_strncpy | ^ include/linux/fortify-string.h:151:16: note: in expansion of macro '__underlying_strncpy' 151 | return __underlying_strncpy(p, q, size); | ^~~~~~~~~~~~~~~~~~~~ In function '__fortify_strlen', inlined from '__assign_req_name' at drivers/nvme/target/trace.h:57:3: include/linux/fortify-string.h:66:33: note: length computed here 66 | #define __underlying_strlen __builtin_strlen | ^ include/linux/fortify-string.h:241:24: note: in expansion of macro '__underlying_strlen' 241 | return __underlying_strlen(p); | ^~~~~~~~~~~~~~~~~~~ In function 'fortify_memcpy_chk', inlined from 'perf_trace_nvmet_req_init' at drivers/nvme/target/./trace.h:61:1: include/linux/fortify-string.h:529:25: warning: call to '__read_overflow2_field' declared with attribute warning: detected read beyond size of field (2nd parameter); maybe use struct_group()? [-Wattribute-warning] 529 | __read_overflow2_field(q_size_field, size); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ In function 'fortify_memcpy_chk', inlined from 'trace_event_raw_event_nvmet_req_init' at drivers/nvme/target/./trace.h:61:1: include/linux/fortify-string.h:529:25: warning: call to '__read_overflow2_field' declared with attribute warning: detected read beyond size of field (2nd parameter); maybe use struct_group()? [-Wattribute-warning] 529 | __read_overflow2_field(q_size_field, size); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
vim +/__builtin_strncpy +68 include/linux/fortify-string.h
78a498c3a227f2 Alexander Potapenko 2022-10-24 61 78a498c3a227f2 Alexander Potapenko 2022-10-24 62 #define __underlying_memchr __builtin_memchr 78a498c3a227f2 Alexander Potapenko 2022-10-24 63 #define __underlying_memcmp __builtin_memcmp a28a6e860c6cf2 Francis Laniel 2021-02-25 64 #define __underlying_strcat __builtin_strcat a28a6e860c6cf2 Francis Laniel 2021-02-25 65 #define __underlying_strcpy __builtin_strcpy a28a6e860c6cf2 Francis Laniel 2021-02-25 66 #define __underlying_strlen __builtin_strlen a28a6e860c6cf2 Francis Laniel 2021-02-25 67 #define __underlying_strncat __builtin_strncat a28a6e860c6cf2 Francis Laniel 2021-02-25 @68 #define __underlying_strncpy __builtin_strncpy a28a6e860c6cf2 Francis Laniel 2021-02-25 69 #endif a28a6e860c6cf2 Francis Laniel 2021-02-25 70
:::::: The code at line 68 was first introduced by commit :::::: a28a6e860c6cf231cf3c5171c75c342adcd00406 string.h: move fortified functions definitions in a dedicated header.
:::::: TO: Francis Laniel <laniel_francis@privacyrequired.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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