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 X-Spam-Level: X-Spam-Status: No, score=-19.1 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 45B08C433EF for ; Mon, 13 Sep 2021 14:50:40 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 2E89560F4C for ; Mon, 13 Sep 2021 14:50:40 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1346759AbhIMOvv (ORCPT ); Mon, 13 Sep 2021 10:51:51 -0400 Received: from mail.kernel.org ([198.145.29.99]:35794 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1346642AbhIMOqT (ORCPT ); Mon, 13 Sep 2021 10:46:19 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id DE16263227; Mon, 13 Sep 2021 13:58:49 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1631541530; bh=pUKMgRRhubTv8YlIAIeLAWIfKVKabc8WEZ8bBTka+oM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=G1FWDRts7AjgM6o0sn+JzYZPZzcs2tzP6pE0hX0hw1gDJbdnIPY1Vz7wV2qYV43V5 pkVMq+OGSFFxQFHseBqgQIm5b3CxqjrP6/iVkhKMafW91WAGIO7j4UUO9kSuIP0rVt UbF5+ciS1QsDWqtd86KTm5W+BTY1bv2Z41Nwu4VE= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Helge Deller , Arnd Bergmann , John David Anglin Subject: [PATCH 5.14 333/334] parisc: Fix unaligned-access crash in bootloader Date: Mon, 13 Sep 2021 15:16:27 +0200 Message-Id: <20210913131124.688441395@linuxfoundation.org> X-Mailer: git-send-email 2.33.0 In-Reply-To: <20210913131113.390368911@linuxfoundation.org> References: <20210913131113.390368911@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: Helge Deller commit c42813b71a06a2ff4a155aa87ac609feeab76cf3 upstream. Kernel v5.14 has various changes to optimize unaligned memory accesses, e.g. commit 0652035a5794 ("asm-generic: unaligned: remove byteshift helpers"). Those changes triggered an unalignment-exception and thus crashed the bootloader on parisc because the unaligned "output_len" variable now suddenly was read word-wise while it was read byte-wise in the past. Fix this issue by declaring the external output_len variable as char which then forces the compiler to generate byte-accesses. Signed-off-by: Helge Deller Cc: Arnd Bergmann Cc: John David Anglin Bug: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102162 Fixes: 8c031ba63f8f ("parisc: Unbreak bootloader due to gcc-7 optimizations") Fixes: 0652035a5794 ("asm-generic: unaligned: remove byteshift helpers") Cc: # v5.14+ Signed-off-by: Greg Kroah-Hartman --- arch/parisc/boot/compressed/misc.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/arch/parisc/boot/compressed/misc.c +++ b/arch/parisc/boot/compressed/misc.c @@ -26,7 +26,7 @@ extern char input_data[]; extern int input_len; /* output_len is inserted by the linker possibly at an unaligned address */ -extern __le32 output_len __aligned(1); +extern char output_len; extern char _text, _end; extern char _bss, _ebss; extern char _startcode_end;