Messages in this thread Patch in this message | | | From | Tony Luck <> | Subject | [PATCH] x86/mce/dev-mcelog: Fix "make W=1" warning about strncpy | Date | Wed, 27 May 2020 11:28:08 -0700 |
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The kbuild test robot reported this warning:
arch/x86/kernel/cpu/mce/dev-mcelog.c: In function 'dev_mcelog_init_device': arch/x86/kernel/cpu/mce/dev-mcelog.c:346:2: warning: 'strncpy' output truncated before terminating nul copying 12 bytes from a string of the same length [-Wstringop-truncation]
This is accurate, but I don't care that the trailing NUL character isn't copied. The string being copied is just a magic number signature so that crash dump tools can be sure they are decoding the right blob of memory.
Change to use memcpy() instead of strncpy()
Reported-by: kbuild test robot <lkp@intel.com> Signed-off-by: Tony Luck <tony.luck@intel.com> --- arch/x86/kernel/cpu/mce/dev-mcelog.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/x86/kernel/cpu/mce/dev-mcelog.c b/arch/x86/kernel/cpu/mce/dev-mcelog.c index d089567a9ce8..bcb379b2fd42 100644 --- a/arch/x86/kernel/cpu/mce/dev-mcelog.c +++ b/arch/x86/kernel/cpu/mce/dev-mcelog.c @@ -343,7 +343,7 @@ static __init int dev_mcelog_init_device(void) if (!mcelog) return -ENOMEM; - strncpy(mcelog->signature, MCE_LOG_SIGNATURE, sizeof(mcelog->signature)); + memcpy(mcelog->signature, MCE_LOG_SIGNATURE, sizeof(mcelog->signature)); mcelog->len = mce_log_len; mcelog->recordlen = sizeof(struct mce); -- 2.21.1
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