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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id CF0C1C4321E for ; Tue, 5 Apr 2022 12:18:57 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1382597AbiDEMQG (ORCPT ); Tue, 5 Apr 2022 08:16:06 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:49668 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S244905AbiDEIwq (ORCPT ); Tue, 5 Apr 2022 04:52:46 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 0C83824596; Tue, 5 Apr 2022 01:46:00 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 9C0F7614E4; Tue, 5 Apr 2022 08:45:59 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id A406DC385A0; Tue, 5 Apr 2022 08:45:58 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1649148359; bh=7PbildU4fVy2AP3yvxFY7nRP8gtRqmn3F61F8jyqIRQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=wUGGQ4QPs1B2nRaLUaY5XTS7QhIzSbkvKS/JEg16nkVqcn5tmf46/a1/7Vv83DP5I 4ME7RbiSqT40Yb7hV0wVl9/qjXZIosyiwm5+x/sTU+QvET2iA2vKPWknLBLiZU82pl mOQGgtVa7ncpeTDdUi6hmlhdiEDH9SCd5/Z6e00A= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Ard Biesheuvel , Nick Desaulniers , "Steven Rostedt (Google)" , Linus Walleij , Sasha Levin Subject: [PATCH 5.16 0328/1017] ARM: ftrace: ensure that ADR takes the Thumb bit into account Date: Tue, 5 Apr 2022 09:20:41 +0200 Message-Id: <20220405070404.017836188@linuxfoundation.org> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20220405070354.155796697@linuxfoundation.org> References: <20220405070354.155796697@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Ard Biesheuvel [ Upstream commit dd88b03ff0c84f4bcbe1419b93a4bed429fed3be ] Using ADR to take the address of 'ftrace_stub' via a local label produces an address that has the Thumb bit cleared, which means the subsequent comparison is guaranteed to fail. Instead, use the badr macro, which forces the Thumb bit to be set. Fixes: a3ba87a61499 ("ARM: 6316/1: ftrace: add Thumb-2 support") Signed-off-by: Ard Biesheuvel Reviewed-by: Nick Desaulniers Reviewed-by: Steven Rostedt (Google) Reviewed-by: Linus Walleij Signed-off-by: Sasha Levin --- arch/arm/kernel/entry-ftrace.S | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/arm/kernel/entry-ftrace.S b/arch/arm/kernel/entry-ftrace.S index a74289ebc803..f4886fb6e9ba 100644 --- a/arch/arm/kernel/entry-ftrace.S +++ b/arch/arm/kernel/entry-ftrace.S @@ -40,7 +40,7 @@ mcount_enter ldr r0, =ftrace_trace_function ldr r2, [r0] - adr r0, .Lftrace_stub + badr r0, .Lftrace_stub cmp r0, r2 bne 1f -- 2.34.1