From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 9816EC5DF6E for ; Sat, 15 Aug 2026 04:46:16 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-ID:Date:Subject:Cc:To:From: Reply-To:Content-Type:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=y3RAP4/V/S2Ka1HZIeZ+MI/MmRFw0KCRbzs9mdx3m/8=; b=f0WreRgq6z01gC0rXXBs95D//O fW6ghxRav4vHIoOQ1qJ5c/P0d/JzeiuWsl+M6UlLIJcKkgyzCOtf5JrHJWb3ggvrvojzxUQorz7Yf 1reK3d2ml/E6yAxAEELp/JVXhf3qDpl+Itpqpzj8WuEYwKT12sgoyvNCmsQtwHqyUHY8h4DtwFZY0 XFYkwnoSbq3Y8n+k8TseBco/buy1qP+P/GBMWtYvqrPYnW2wYU+SXeXGEo0P8lIRoVOijb7McLIQs m4YzXtzX/IruY/hEubF2ne128r/k7md7veKzrVXNfKeWjFZJq1zdp6xTQtzb3JNoe6v+BujepjAkD P+9mRUVQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1wv6HW-00000003V85-2KGV; Sat, 15 Aug 2026 04:46:06 +0000 Received: from tor.source.kernel.org ([172.105.4.254]) by bombadil.infradead.org with esmtps (Exim 4.99.1 #2 (Red Hat Linux)) id 1wv6HH-00000003V0I-3UMt for linux-arm-kernel@lists.infradead.org; Sat, 15 Aug 2026 04:45:51 +0000 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) by tor.source.kernel.org (Postfix) with ESMTP id 43F5460A7B; Sat, 15 Aug 2026 04:45:51 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 68A381F00A3A; Sat, 15 Aug 2026 04:45:50 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1786769151; bh=y3RAP4/V/S2Ka1HZIeZ+MI/MmRFw0KCRbzs9mdx3m/8=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=Yh2lWpvnhz/fqU5jrXmd7zdXBwN04vdE8Z/rdgzWLKG0vWbPRSF34Y4UJkIZSwTOs S4CkWWnCpBwkjvzo5FcwdusCciF7mOItmOGAPwvIuWuELsPaQOJ8gcLAnu460XMtlo QO2PATvBByJLhdu2UjJ1jhXdjUsQi9BzR61XVcp/Y0VZgDpOkm80/sHY4DCroSkdzW MtvS3EAex7G0Oqsiug7sSJekBehikkGIdr0L2ZpJe0ss1IlPNA70ziImVNr3QlEnYx P7rBvcsr3r2B2TWM/tPLvFq1yVFWnUyh8HFFnVf4g/SCwrGzMEZIX+SXJpQm0bFbY6 QmA21yYigQvIQ== From: Josh Poimboeuf To: Catalin Marinas , Will Deacon Cc: linux-kernel@vger.kernel.org, Ard Biesheuvel , linux-arm-kernel@lists.infradead.org, live-patching@vger.kernel.org, Song Liu , Miroslav Benes , Petr Mladek , Joe Lawrence , Mark Rutland , Mark Brown , Nick Desaulniers , Kees Cook , Nathan Chancellor , linux-toolchains@vger.kernel.org Subject: [PATCH 11/12] arm64/bti: Force-enable BTI linker veneers Date: Fri, 14 Aug 2026 21:45:28 -0700 Message-ID: X-Mailer: git-send-email 2.55.0 In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org The linker only emits the BTI veneers if *all* input objects have GNU_PROPERTY_AARCH64_FEATURE_1_BTI. All the kernel's objects now advertise it, but if some object stops doing so, BTI veneers silently stop getting created on >128MB kernels, resulting in BTI exceptions at runtime. Force BTI veneers enabled with "-z force-bti" to prevent a single bad object from ruining things. This also emits a warning (or error with CONFIG_WERROR) if any objects are missing the bit. Signed-off-by: Josh Poimboeuf --- arch/arm64/Makefile | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/arm64/Makefile b/arch/arm64/Makefile index 4eee721c0b278..d0db9a6766a2f 100644 --- a/arch/arm64/Makefile +++ b/arch/arm64/Makefile @@ -25,6 +25,7 @@ endif ifeq ($(CONFIG_ARM64_BTI_KERNEL),y) KBUILD_AFLAGS += -include $(srctree)/arch/arm64/include/asm/bti-note.h +LDFLAGS_vmlinux += $(call ld-option,-z force-bti) endif cc_has_k_constraint := $(call try-run,echo \ -- 2.55.0