kumquat-buildroot/package/mmc-utils/0002-fix-overlapping-with-strncpy.patch

From 1c90a7534658056b884d71ef82dc7ca8bad4271b Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Cl=C3=A9ment=20P=C3=A9ron?= <peron.clem@gmail.com>
Date: Wed, 24 Oct 2018 13:00:47 +0200
Subject: [PATCH] mmc-utils: fix overlapping with strncpy
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GCC 8.2 warns about an overlapping using strncpy.

Replace strncpy with a memmove to avoid this issue.

In file included from /usr/include/string.h:494,
                 from lsmmc.c:46:
In function ‘strncpy’,
    inlined from ‘read_file’ at lsmmc.c:356:3:
/usr/include/x86_64-linux-gnu/bits/string_fortified.h:106:10: error: ‘__builtin_strncpy’ accessing 4096 bytes at offsets 0 and 1 overlaps 4095 bytes at offset 1 [-Werror=restrict]
   return __builtin___strncpy_chk (__dest, __src, __len, __bos (__dest));
          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
cc1: all warnings being treated as errors
make: *** [Makefile:36: lsmmc.o] Error 1

Signed-off-by: Clément Péron <peron.clem@gmail.com>
Signed-off-by: Sébastien Szymanski <sebastien.szymanski@armadeus.com>
---
 lsmmc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lsmmc.c b/lsmmc.c
index c4faa00..bcb854d 100644
--- a/lsmmc.c
+++ b/lsmmc.c
@@ -353,7 +353,7 @@ char *read_file(char *name)
 		line[strlen(line) - 1] = '\0';
 
 	while (isspace(line[0]))
-		strncpy(&line[0], &line[1], sizeof(line));
+		memmove(&line[0], &line[1], sizeof(line)-1);
 
 	return strdup(line);
 }
-- 
2.16.4