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sh: machvec: Use char[] for section boundaries 

[ Upstream commit c5783af354 ]

As done for other sections, define the extern as a character array,
which relaxes many of the compiler-time object size checks, which would
otherwise assume it's a single long. Solves the following build error:

arch/sh/kernel/machvec.c: error: array subscript 'struct sh_machine_vector[0]' is partly outside array bounds of 'long int[1]' [-Werror=array-bounds]:  => 105:33

Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
Cc: Rich Felker <dalias@libc.org>
Cc: linux-sh@vger.kernel.org
Reported-by: Geert Uytterhoeven <geert@linux-m68k.org>
Link: https://lore.kernel.org/lkml/alpine.DEB.2.22.394.2209050944290.964530@ramsan.of.borg/
Fixes: 9655ad03af ("sh: Fixup machvec support.")
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Acked-by: Rich Felker <dalias@libc.org>
Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Kees Cook 2022-09-07 16:40:44 -07:00 committed by Greg Kroah-Hartman
parent 248e24249a
commit c201cb95ac
2 changed files with 6 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
arch/sh/include/asm/sections.h
View File

@ -4,7 +4,7 @@
#include <asm-generic/sections.h>
extern long __machvec_start, __machvec_end;
extern char __machvec_start[], __machvec_end[];
extern char __uncached_start, __uncached_end;
extern char __start_eh_frame[], __stop_eh_frame[];

10
arch/sh/kernel/machvec.c
View File

@ -20,8 +20,8 @@
#define MV_NAME_SIZE 32
#define for_each_mv(mv) \
for ((mv) = (struct sh_machine_vector *)&__machvec_start; \
(mv) && (unsigned long)(mv) < (unsigned long)&__machvec_end; \
for ((mv) = (struct sh_machine_vector *)__machvec_start; \
(mv) && (unsigned long)(mv) < (unsigned long)__machvec_end; \
(mv)++)
static struct sh_machine_vector * __init get_mv_byname(const char *name)
@ -87,8 +87,8 @@ void __init sh_mv_setup(void)
if (!machvec_selected) {
unsigned long machvec_size;
machvec_size = ((unsigned long)&__machvec_end -
(unsigned long)&__machvec_start);
machvec_size = ((unsigned long)__machvec_end -
(unsigned long)__machvec_start);
/*
* Sanity check for machvec section alignment. Ensure
@ -102,7 +102,7 @@ void __init sh_mv_setup(void)
* vector (usually the only one) from .machvec.init.
*/
if (machvec_size >= sizeof(struct sh_machine_vector))
sh_mv = *(struct sh_machine_vector *)&__machvec_start;
sh_mv = *(struct sh_machine_vector *)__machvec_start;
}
pr_notice("Booting machvec: %s\n", get_system_type());