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xen/mcelog: Add __nonstring annotations for unterminated strings

When a character array without a terminating NUL character has a static
initializer, GCC 15's -Wunterminated-string-initialization will only
warn if the array lacks the "nonstring" attribute[1]. Mark the arrays
with __nonstring to and correctly identify the char array as "not a C
string" and thereby eliminate the warning.

Link: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=117178 [1]
Cc: Juergen Gross <jgross@suse.com>
Cc: Stefano Stabellini <sstabellini@kernel.org>
Cc: Oleksandr Tyshchenko <oleksandr_tyshchenko@epam.com>
Cc: xen-devel@lists.xenproject.org
Signed-off-by: Kees Cook <kees@kernel.org>
Acked-by: Juergen Gross <jgross@suse.com>
Message-ID: <20250310222234.work.473-kees@kernel.org>
Signed-off-by: Juergen Gross <jgross@suse.com>

authored by

Kees Cook and committed by
Juergen Gross 1c3dfc7c 2356f15c

+1 -1
+1 -1
include/xen/interface/xen-mca.h
··· 372 372 #define XEN_MCE_LOG_LEN 32 373 373 374 374 struct xen_mce_log { 375 - char signature[12]; /* "MACHINECHECK" */ 375 + char signature[12] __nonstring; /* "MACHINECHECK" */ 376 376 unsigned len; /* = XEN_MCE_LOG_LEN */ 377 377 unsigned next; 378 378 unsigned flags;