include/linux/fortify-string.h:55:33: warning: '__builtin_strncpy' specified bound 30 equals destination size
From: kernel test robot
Date: Tue Oct 17 2023 - 13:42:20 EST
tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: 213f891525c222e8ed145ce1ce7ae1f47921cb9c
commit: e240e53ae0abb0896e0f399bdfef41c69cec3123 mm, slub: add CONFIG_SLUB_TINY
date: 11 months ago
config: x86_64-randconfig-m031-20230109 (https://download.01.org/0day-ci/archive/20231018/202310180153.kXs18a7s-lkp@xxxxxxxxx/config)
compiler: gcc-12 (Debian 12.2.0-14) 12.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20231018/202310180153.kXs18a7s-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/202310180153.kXs18a7s-lkp@xxxxxxxxx/
All warnings (new ones prefixed by >>):
In file included from include/linux/string.h:253,
from include/linux/bitmap.h:11,
from include/linux/cpumask.h:12,
from arch/x86/include/asm/cpumask.h:5,
from arch/x86/include/asm/msr.h:11,
from arch/x86/include/asm/processor.h:22,
from arch/x86/include/asm/cpufeature.h:5,
from arch/x86/include/asm/thread_info.h:53,
from include/linux/thread_info.h:60,
from arch/x86/include/asm/preempt.h:7,
from include/linux/preempt.h:78,
from include/linux/spinlock.h:56,
from include/linux/mmzone.h:8,
from include/linux/memremap.h:5,
from drivers/dax/bus.c:3:
In function 'strncpy',
inlined from 'do_id_store' at drivers/dax/bus.c:87:5:
>> include/linux/fortify-string.h:55:33: warning: '__builtin_strncpy' specified bound 30 equals destination size [-Wstringop-truncation]
55 | #define __underlying_strncpy __builtin_strncpy
| ^
include/linux/fortify-string.h:131:16: note: in expansion of macro '__underlying_strncpy'
131 | return __underlying_strncpy(p, q, size);
| ^~~~~~~~~~~~~~~~~~~~
--
In file included from include/linux/string.h:253,
from include/linux/bitmap.h:11,
from include/linux/cpumask.h:12,
from arch/x86/include/asm/cpumask.h:5,
from arch/x86/include/asm/msr.h:11,
from arch/x86/include/asm/processor.h:22,
from arch/x86/include/asm/timex.h:5,
from include/linux/timex.h:67,
from include/linux/time32.h:13,
from include/linux/time.h:60,
from include/linux/stat.h:19,
from include/linux/module.h:13,
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:55:33: warning: '__builtin_strncpy' specified bound depends on the length of the source argument [-Wstringop-truncation]
55 | #define __underlying_strncpy __builtin_strncpy
| ^
include/linux/fortify-string.h:131:16: note: in expansion of macro '__underlying_strncpy'
131 | 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:53:33: note: length computed here
53 | #define __underlying_strlen __builtin_strlen
| ^
include/linux/fortify-string.h:183:24: note: in expansion of macro '__underlying_strlen'
183 | 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:400:25: warning: call to '__read_overflow2_field' declared with attribute warning: detected read beyond size of field (2nd parameter); maybe use struct_group()? [-Wattribute-warning]
400 | __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:400:25: warning: call to '__read_overflow2_field' declared with attribute warning: detected read beyond size of field (2nd parameter); maybe use struct_group()? [-Wattribute-warning]
400 | __read_overflow2_field(q_size_field, size);
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
vim +/__builtin_strncpy +55 include/linux/fortify-string.h
3009f891bb9f32 Kees Cook 2021-08-02 33
a28a6e860c6cf2 Francis Laniel 2021-02-25 34 #if defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS)
a28a6e860c6cf2 Francis Laniel 2021-02-25 35 extern void *__underlying_memchr(const void *p, int c, __kernel_size_t size) __RENAME(memchr);
a28a6e860c6cf2 Francis Laniel 2021-02-25 36 extern int __underlying_memcmp(const void *p, const void *q, __kernel_size_t size) __RENAME(memcmp);
a28a6e860c6cf2 Francis Laniel 2021-02-25 37 extern void *__underlying_memcpy(void *p, const void *q, __kernel_size_t size) __RENAME(memcpy);
a28a6e860c6cf2 Francis Laniel 2021-02-25 38 extern void *__underlying_memmove(void *p, const void *q, __kernel_size_t size) __RENAME(memmove);
a28a6e860c6cf2 Francis Laniel 2021-02-25 39 extern void *__underlying_memset(void *p, int c, __kernel_size_t size) __RENAME(memset);
a28a6e860c6cf2 Francis Laniel 2021-02-25 40 extern char *__underlying_strcat(char *p, const char *q) __RENAME(strcat);
a28a6e860c6cf2 Francis Laniel 2021-02-25 41 extern char *__underlying_strcpy(char *p, const char *q) __RENAME(strcpy);
a28a6e860c6cf2 Francis Laniel 2021-02-25 42 extern __kernel_size_t __underlying_strlen(const char *p) __RENAME(strlen);
a28a6e860c6cf2 Francis Laniel 2021-02-25 43 extern char *__underlying_strncat(char *p, const char *q, __kernel_size_t count) __RENAME(strncat);
a28a6e860c6cf2 Francis Laniel 2021-02-25 44 extern char *__underlying_strncpy(char *p, const char *q, __kernel_size_t size) __RENAME(strncpy);
a28a6e860c6cf2 Francis Laniel 2021-02-25 45 #else
a28a6e860c6cf2 Francis Laniel 2021-02-25 46 #define __underlying_memchr __builtin_memchr
a28a6e860c6cf2 Francis Laniel 2021-02-25 47 #define __underlying_memcmp __builtin_memcmp
a28a6e860c6cf2 Francis Laniel 2021-02-25 48 #define __underlying_memcpy __builtin_memcpy
a28a6e860c6cf2 Francis Laniel 2021-02-25 49 #define __underlying_memmove __builtin_memmove
a28a6e860c6cf2 Francis Laniel 2021-02-25 50 #define __underlying_memset __builtin_memset
a28a6e860c6cf2 Francis Laniel 2021-02-25 51 #define __underlying_strcat __builtin_strcat
a28a6e860c6cf2 Francis Laniel 2021-02-25 52 #define __underlying_strcpy __builtin_strcpy
a28a6e860c6cf2 Francis Laniel 2021-02-25 53 #define __underlying_strlen __builtin_strlen
a28a6e860c6cf2 Francis Laniel 2021-02-25 54 #define __underlying_strncat __builtin_strncat
a28a6e860c6cf2 Francis Laniel 2021-02-25 @55 #define __underlying_strncpy __builtin_strncpy
a28a6e860c6cf2 Francis Laniel 2021-02-25 56 #endif
a28a6e860c6cf2 Francis Laniel 2021-02-25 57
:::::: The code at line 55 was first introduced by commit
:::::: a28a6e860c6cf231cf3c5171c75c342adcd00406 string.h: move fortified functions definitions in a dedicated header.
:::::: TO: Francis Laniel <laniel_francis@xxxxxxxxxxxxxxxxxxx>
:::::: CC: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
--
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