* [PATCH AUTOSEL 5.7 375/388] x86/mce/dev-mcelog: Fix -Wstringop-truncation warning about strncpy()
[not found] <20200618010805.600873-1-sashal@kernel.org>
@ 2020-06-18 1:07 ` Sasha Levin
0 siblings, 0 replies; only message in thread
From: Sasha Levin @ 2020-06-18 1:07 UTC (permalink / raw)
To: linux-kernel, stable
Cc: Tony Luck, kbuild test robot, Borislav Petkov, Thomas Gleixner,
Sasha Levin, linux-edac
From: Tony Luck <tony.luck@intel.com>
[ Upstream commit 7ccddc4613db446dc3cbb69a3763ba60ec651d13 ]
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.
Use memcpy() instead of strncpy().
Fixes: d8ecca4043f2 ("x86/mce/dev-mcelog: Dynamically allocate space for machine check records")
Reported-by: kbuild test robot <lkp@intel.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lkml.kernel.org/r/20200527182808.27737-1-tony.luck@intel.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
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);
--
2.25.1
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