Linux-EDAC Archive on
 help / color / Atom feed
* [PATCH AUTOSEL 5.7 375/388] x86/mce/dev-mcelog: Fix -Wstringop-truncation warning about strncpy()
       [not found] <>
@ 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 <>

[ 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 <>
Signed-off-by: Tony Luck <>
Signed-off-by: Borislav Petkov <>
Signed-off-by: Thomas Gleixner <>
Signed-off-by: Sasha Levin <>
 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);

^ permalink raw reply	[flat|nested] only message in thread

only message in thread, back to index

Thread overview: (only message) (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
     [not found] <>
2020-06-18  1:07 ` [PATCH AUTOSEL 5.7 375/388] x86/mce/dev-mcelog: Fix -Wstringop-truncation warning about strncpy() Sasha Levin

Linux-EDAC Archive on

Archives are clonable:
	git clone --mirror linux-edac/git/0.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 linux-edac linux-edac/ \
	public-inbox-index linux-edac

Example config snippet for mirrors

Newsgroup available over NNTP:

AGPL code for this site: git clone