sh: machvec: Use char[] for section boundaries

[ Upstream commit c5783af ] 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 <[email protected]> Cc: Rich Felker <[email protected]> Cc: [email protected] Reported-by: Geert Uytterhoeven <[email protected]> Link: https://lore.kernel.org/lkml/[email protected]/ Fixes: 9655ad0 ("sh: Fixup machvec support.") Reviewed-by: Geert Uytterhoeven <[email protected]> Reviewed-by: Gustavo A. R. Silva <[email protected]> Acked-by: Rich Felker <[email protected]> Signed-off-by: Kees Cook <[email protected]> Signed-off-by: Sasha Levin <[email protected]>
hardkernel · Oct 26, 2022 · 6b436d2 · 6b436d2
1 parent ab3fda4
commit 6b436d2
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Showing 2 changed files with 6 additions and 6 deletions.
diff --git a/arch/sh/include/asm/sections.h b/arch/sh/include/asm/sections.h
@@ -3,7 +3,7 @@
 
 #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[];
 

diff --git a/arch/sh/kernel/machvec.c b/arch/sh/kernel/machvec.c
@@ -22,8 +22,8 @@
 #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)
@@ -89,8 +89,8 @@ 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
@@ -104,7 +104,7 @@ 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;
 	}
 
 	printk(KERN_NOTICE "Booting machvec: %s\n", get_system_type());