[Buildroot] [PATCH v2 1/1] package/mmc-utils: add patch to fix build failure

[Baruch Siach]

Hi Sébastien,

Sébastien Szymanski writes:
> Patch taken from:
>  - https://patchwork.kernel.org/patch/10654531/
>
> Fixes:
>  - http://autobuild.buildroot.net/results/404bfbd095a7b80273391ea36ea81ba496164b80
>  - http://autobuild.buildroot.net/results/233ef5c00951b5be10a59408f4a8781ecc658d74
>  - http://autobuild.buildroot.net/results/eba3cf4ac21095bca5af2d5d1d69aca0c9098f9b
>
> Signed-off-by: Sébastien Szymanski <sebastien.szymanski at armadeus.com>
> ---
>
> Changes for v2:
>  - use git format-patch
>
>  .../0002-fix-overlapping-with-strncpy.patch        | 43 ++++++++++++++++++++++
>  1 file changed, 43 insertions(+)
>  create mode 100644 package/mmc-utils/0002-fix-overlapping-with-strncpy.patch
>
> diff --git a/package/mmc-utils/0002-fix-overlapping-with-strncpy.patch b/package/mmc-utils/0002-fix-overlapping-with-strncpy.patch
> new file mode 100644
> index 0000000000..194862e801
> --- /dev/null
> +++ b/package/mmc-utils/0002-fix-overlapping-with-strncpy.patch
> @@ -0,0 +1,43 @@
> +From 1c90a7534658056b884d71ef82dc7ca8bad4271b Mon Sep 17 00:00:00 2001
> +From: =?UTF-8?q?Cl=C3=A9ment=20P=C3=A9ron?= <peron.clem at gmail.com>
> +Date: Wed, 24 Oct 2018 13:00:47 +0200
> +Subject: [PATCH 1/1] mmc-utils: fix overlapping with strncpy
> +MIME-Version: 1.0
> +Content-Type: text/plain; charset=UTF-8
> +Content-Transfer-Encoding: 8bit
> +
> +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 at gmail.com>

Please add your sign-off on the patch here.

Thanks,
baruch

> +---
> + 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);
> + }

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