From 82d76bf938389e23c3826b2859fd6c84fd71366a Mon Sep 17 00:00:00 2001 From: Kees Cook Date: Tue, 15 Apr 2025 16:25:19 -0700 Subject: [PATCH] md/bcache: Mark __nonstring look-up table GCC 15's new -Wunterminated-string-initialization notices that the 16 character lookup table "zero_uuid" (which is not used as a C-String) needs to be marked as "nonstring": drivers/md/bcache/super.c: In function 'uuid_find_empty': drivers/md/bcache/super.c:549:43: warning: initializer-string for array of 'char' truncates NUL terminator but destination lacks 'nonstring' attribute (17 chars into 16 available) [-Wunterminated-string-initialization] 549 | static const char zero_uuid[16] = "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"; | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Add the annotation (since it is not used as a C-String), and switch the initializer to an array of bytes rather than an empty initializer, as preferred by Coly Li. Suggested-by: Coly Li Link: https://lore.kernel.org/lkml/389A9925-0990-422C-A1B3-0195FAA73288@coly.li/ Signed-off-by: Kees Cook --- drivers/md/bcache/super.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/md/bcache/super.c b/drivers/md/bcache/super.c index 813b38aec3e4..cc1de925111c 100644 --- a/drivers/md/bcache/super.c +++ b/drivers/md/bcache/super.c @@ -546,7 +546,8 @@ static struct uuid_entry *uuid_find(struct cache_set *c, const char *uuid) static struct uuid_entry *uuid_find_empty(struct cache_set *c) { - static const char zero_uuid[16] = { 0 }; + static const char zero_uuid[16] __nonstring = + { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }; return uuid_find(c, zero_uuid); } -- 2.50.1