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Date: Fri, 28 Jan 2022 10:16:06 +0800
From: kernel test robot <lkp@...el.com>
To: Tom Zanussi <zanussi@...nel.org>
Cc: kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org
Subject: [zanussi-trace:ftrace/misc-bugfixes-v1 6/7]
include/linux/fortify-string.h:47:30: warning: '__builtin_strncat' output
truncated before terminating nul copying as many bytes from a string as its
length
tree: https://git.kernel.org/pub/scm/linux/kernel/git/zanussi/linux-trace.git ftrace/misc-bugfixes-v1
head: a291c672d6e1d7f557d9e15a5ac3f0b446e29dcd
commit: b519e15e681319e99055a92c8d090072ebb2b179 [6/7] tracing: Remove size restriction on hist trigger cmd error logging
config: i386-randconfig-a002-20220124 (https://download.01.org/0day-ci/archive/20220128/202201281016.u1LRBCEw-lkp@intel.com/config)
compiler: gcc-9 (Debian 9.3.0-22) 9.3.0
reproduce (this is a W=1 build):
# https://git.kernel.org/pub/scm/linux/kernel/git/zanussi/linux-trace.git/commit/?id=b519e15e681319e99055a92c8d090072ebb2b179
git remote add zanussi-trace https://git.kernel.org/pub/scm/linux/kernel/git/zanussi/linux-trace.git
git fetch --no-tags zanussi-trace ftrace/misc-bugfixes-v1
git checkout b519e15e681319e99055a92c8d090072ebb2b179
# save the config file to linux build tree
mkdir build_dir
make W=1 O=build_dir ARCH=i386 SHELL=/bin/bash kernel/trace/
If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@...el.com>
All warnings (new ones prefixed by >>):
In file included from include/linux/string.h:253,
from arch/x86/include/asm/page_32.h:35,
from arch/x86/include/asm/page.h:14,
from arch/x86/include/asm/processor.h:19,
from arch/x86/include/asm/timex.h:5,
from include/linux/timex.h:65,
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 kernel/trace/trace_events_hist.c:8:
In function 'strncat',
inlined from 'last_cmd_set' at kernel/trace/trace_events_hist.c:759:2,
inlined from 'event_hist_trigger_parse' at kernel/trace/trace_events_hist.c:6190:3:
>> include/linux/fortify-string.h:47:30: warning: '__builtin_strncat' output truncated before terminating nul copying as many bytes from a string as its length [-Wstringop-truncation]
47 | #define __underlying_strncat __builtin_strncat
| ^
include/linux/fortify-string.h:191:10: note: in expansion of macro '__underlying_strncat'
191 | return __underlying_strncat(p, q, count);
| ^~~~~~~~~~~~~~~~~~~~
kernel/trace/trace_events_hist.c: In function 'event_hist_trigger_parse':
include/linux/fortify-string.h:46:29: note: length computed here
46 | #define __underlying_strlen __builtin_strlen
| ^
include/linux/fortify-string.h:102:10: note: in expansion of macro '__underlying_strlen'
102 | return __underlying_strlen(p);
| ^~~~~~~~~~~~~~~~~~~
vim +/__builtin_strncat +47 include/linux/fortify-string.h
3009f891bb9f328 Kees Cook 2021-08-02 26
a28a6e860c6cf23 Francis Laniel 2021-02-25 27 #if defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS)
a28a6e860c6cf23 Francis Laniel 2021-02-25 28 extern void *__underlying_memchr(const void *p, int c, __kernel_size_t size) __RENAME(memchr);
a28a6e860c6cf23 Francis Laniel 2021-02-25 29 extern int __underlying_memcmp(const void *p, const void *q, __kernel_size_t size) __RENAME(memcmp);
a28a6e860c6cf23 Francis Laniel 2021-02-25 30 extern void *__underlying_memcpy(void *p, const void *q, __kernel_size_t size) __RENAME(memcpy);
a28a6e860c6cf23 Francis Laniel 2021-02-25 31 extern void *__underlying_memmove(void *p, const void *q, __kernel_size_t size) __RENAME(memmove);
a28a6e860c6cf23 Francis Laniel 2021-02-25 32 extern void *__underlying_memset(void *p, int c, __kernel_size_t size) __RENAME(memset);
a28a6e860c6cf23 Francis Laniel 2021-02-25 33 extern char *__underlying_strcat(char *p, const char *q) __RENAME(strcat);
a28a6e860c6cf23 Francis Laniel 2021-02-25 34 extern char *__underlying_strcpy(char *p, const char *q) __RENAME(strcpy);
a28a6e860c6cf23 Francis Laniel 2021-02-25 35 extern __kernel_size_t __underlying_strlen(const char *p) __RENAME(strlen);
a28a6e860c6cf23 Francis Laniel 2021-02-25 36 extern char *__underlying_strncat(char *p, const char *q, __kernel_size_t count) __RENAME(strncat);
a28a6e860c6cf23 Francis Laniel 2021-02-25 37 extern char *__underlying_strncpy(char *p, const char *q, __kernel_size_t size) __RENAME(strncpy);
a28a6e860c6cf23 Francis Laniel 2021-02-25 38 #else
a28a6e860c6cf23 Francis Laniel 2021-02-25 39 #define __underlying_memchr __builtin_memchr
a28a6e860c6cf23 Francis Laniel 2021-02-25 40 #define __underlying_memcmp __builtin_memcmp
a28a6e860c6cf23 Francis Laniel 2021-02-25 41 #define __underlying_memcpy __builtin_memcpy
a28a6e860c6cf23 Francis Laniel 2021-02-25 42 #define __underlying_memmove __builtin_memmove
a28a6e860c6cf23 Francis Laniel 2021-02-25 43 #define __underlying_memset __builtin_memset
a28a6e860c6cf23 Francis Laniel 2021-02-25 44 #define __underlying_strcat __builtin_strcat
a28a6e860c6cf23 Francis Laniel 2021-02-25 45 #define __underlying_strcpy __builtin_strcpy
a28a6e860c6cf23 Francis Laniel 2021-02-25 46 #define __underlying_strlen __builtin_strlen
a28a6e860c6cf23 Francis Laniel 2021-02-25 @47 #define __underlying_strncat __builtin_strncat
a28a6e860c6cf23 Francis Laniel 2021-02-25 48 #define __underlying_strncpy __builtin_strncpy
a28a6e860c6cf23 Francis Laniel 2021-02-25 49 #endif
a28a6e860c6cf23 Francis Laniel 2021-02-25 50
:::::: The code at line 47 was first introduced by commit
:::::: a28a6e860c6cf231cf3c5171c75c342adcd00406 string.h: move fortified functions definitions in a dedicated header.
:::::: TO: Francis Laniel <laniel_francis@...vacyrequired.com>
:::::: CC: Linus Torvalds <torvalds@...ux-foundation.org>
---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
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