linux-kernel - [PATCH 45/46] kasan, lto: remove extra BUILD_BUG() in memory_is

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Message-Id: <20221114114344.18650-46-jirislaby@kernel.org>
Date:   Mon, 14 Nov 2022 12:43:43 +0100
From:   "Jiri Slaby (SUSE)" <jirislaby@...nel.org>
To:     linux-kernel@...r.kernel.org
Cc:     Martin Liska <mliska@...e.cz>,
        Andrey Ryabinin <ryabinin.a.a@...il.com>,
        Alexander Potapenko <glider@...gle.com>,
        Andrey Konovalov <andreyknvl@...il.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Vincenzo Frascino <vincenzo.frascino@....com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        kasan-dev@...glegroups.com, linux-mm@...ck.org,
        Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 45/46] kasan, lto: remove extra BUILD_BUG() in memory_is_poisoned

From: Martin Liska <mliska@...e.cz>

The function memory_is_poisoned() can handle any size which can be
propagated by LTO later on. So we can end up with a constant that is not
handled in the switch. Thus just break and call memory_is_poisoned_n()
which handles arbitrary size to avoid build errors with gcc LTO.

Cc: Andrey Ryabinin <ryabinin.a.a@...il.com>
Cc: Alexander Potapenko <glider@...gle.com>
Cc: Andrey Konovalov <andreyknvl@...il.com>
Cc: Dmitry Vyukov <dvyukov@...gle.com>
Cc: Vincenzo Frascino <vincenzo.frascino@....com>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: kasan-dev@...glegroups.com
Cc: linux-mm@...ck.org
Signed-off-by: Martin Liska <mliska@...e.cz>
Signed-off-by: Jiri Slaby <jslaby@...e.cz>
---
 mm/kasan/generic.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/kasan/generic.c b/mm/kasan/generic.c
index d8b5590f9484..d261f83c6687 100644
--- a/mm/kasan/generic.c
+++ b/mm/kasan/generic.c
@@ -152,7 +152,7 @@ static __always_inline bool memory_is_poisoned(unsigned long addr, size_t size)
 		case 16:
 			return memory_is_poisoned_16(addr);
 		default:
-			BUILD_BUG();
+			break;
 		}
 	}
 
-- 
2.38.1