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Subject[tip: ras/core] x86/mce/dev-mcelog: Fix -Wstringop-truncation warning about strncpy()
The following commit has been merged into the ras/core branch of tip:

Commit-ID: 45811ba140593e288a288c2a2e45d25f38d20d73
Author: Tony Luck <>
AuthorDate: Wed, 27 May 2020 11:28:08 -07:00
Committer: Borislav Petkov <>
CommitterDate: Wed, 27 May 2020 21:19:38 +02:00

x86/mce/dev-mcelog: Fix -Wstringop-truncation warning about strncpy()

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 <>
Signed-off-by: Tony Luck <>
Signed-off-by: Borislav Petkov <>
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 a4fd528..43c4660 100644
--- a/arch/x86/kernel/cpu/mce/dev-mcelog.c
+++ b/arch/x86/kernel/cpu/mce/dev-mcelog.c
@@ -349,7 +349,7 @@ 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);

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