From patchwork Mon Jun 10 21:20:07 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 10985443 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 0A66614BB for ; Mon, 10 Jun 2019 21:20:44 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id EF51B20182 for ; Mon, 10 Jun 2019 21:20:43 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id E39852835B; Mon, 10 Jun 2019 21:20:43 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.2 required=2.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,MAILING_LIST_MULTI,RCVD_IN_DNSWL_HI,SUSPICIOUS_RECIPS autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 751C220182 for ; Mon, 10 Jun 2019 21:20:43 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2390174AbfFJVUm (ORCPT ); Mon, 10 Jun 2019 17:20:42 -0400 Received: from bombadil.infradead.org ([198.137.202.133]:37866 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2390157AbfFJVUl (ORCPT ); Mon, 10 Jun 2019 17:20:41 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20170209; h=Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Sender :Reply-To:Content-Type:Content-ID:Content-Description:Resent-Date:Resent-From :Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id:List-Help: List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=HU6kHTNFa+R10seSyyeXaLI/u/CE3GjB+DCIYQwe6ww=; b=JqZQbuDCovZhJ4IBx1qsE+p2ND 3TvQWbUKInHoY+mqZdgwEG8GKanRtU1iJfnl+w0hzvtJS1pQmXPUIJq/2dxgfAlAaTzrtURsr54JW 021XQkikQMjm45CWhrxBAVt8eUNmsovcrAYCS2XEXCB9Cz8vRsufCTlP984e1Xye70+opSXQ3frBL sxAqar8ACYKvI2xR6IFt0i2ka5O1Y8VGlgZzwuoJjVQCulkCN/iLE6Y6MVFt6O3BCwpOlqB61mCh3 5rqpWGvfa3+XVZ9Ri2svg3pSfVWXfsFWUTVxL6eBgPk+NTEMr1fTcx1NteHX3EjihFOkhWY63PJKT Bj5HQK7A==; Received: from 089144193064.atnat0002.highway.a1.net ([89.144.193.64] helo=localhost) by bombadil.infradead.org with esmtpsa (Exim 4.92 #3 (Red Hat Linux)) id 1haRiW-0000XW-Qp; Mon, 10 Jun 2019 21:20:37 +0000 From: Christoph Hellwig To: Greg Ungerer Cc: Michal Simek , linux-arm-kernel@lists.infradead.org, linux-c6x-dev@linux-c6x.org, uclinux-h8-devel@lists.sourceforge.jp, linux-m68k@lists.linux-m68k.org, linux-riscv@lists.infradead.org, linux-sh@vger.kernel.org, linux-xtensa@linux-xtensa.org, linux-kernel@vger.kernel.org Subject: [PATCH 07/15] binfmt_flat: use __be32 for the on-disk format Date: Mon, 10 Jun 2019 23:20:07 +0200 Message-Id: <20190610212015.9157-8-hch@lst.de> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190610212015.9157-1-hch@lst.de> References: <20190610212015.9157-1-hch@lst.de> MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html Sender: linux-sh-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-sh@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP So far binfmt_flat has onl been supported on 32-bit platforms, so the variable size of the fields didn't matter. But the upcoming RISC-V nommu port supports 64-bit CPUs, and we now have a conflict between the elf2flt creation tool that always uses 32-bit fields and the kernel that uses (unsigned) long field. Switch to the userspace view as the rest of the binfmt_flat format is completely architecture neutral, and binfmt_flat isn't the right binary format for huge executables to start with. While we're at it also ensure these fields are using __be types as they big endian and are byteswapped when loaded. Signed-off-by: Christoph Hellwig wip Reviewed-by: Vladimir Murzin --- include/linux/flat.h | 48 ++++++++++++++++++++++---------------------- 1 file changed, 24 insertions(+), 24 deletions(-) diff --git a/include/linux/flat.h b/include/linux/flat.h index 21d901ba191b..59e892d5fadb 100644 --- a/include/linux/flat.h +++ b/include/linux/flat.h @@ -24,26 +24,26 @@ */ struct flat_hdr { - char magic[4]; - unsigned long rev; /* version (as above) */ - unsigned long entry; /* Offset of first executable instruction - with text segment from beginning of file */ - unsigned long data_start; /* Offset of data segment from beginning of - file */ - unsigned long data_end; /* Offset of end of data segment - from beginning of file */ - unsigned long bss_end; /* Offset of end of bss segment from beginning - of file */ + char magic[4]; + __be32 rev; /* version (as above) */ + __be32 entry; /* Offset of first executable instruction + with text segment from beginning of file */ + __be32 data_start; /* Offset of data segment from beginning of + file */ + __be32 data_end; /* Offset of end of data segment from beginning + of file */ + __be32 bss_end; /* Offset of end of bss segment from beginning + of file */ /* (It is assumed that data_end through bss_end forms the bss segment.) */ - unsigned long stack_size; /* Size of stack, in bytes */ - unsigned long reloc_start; /* Offset of relocation records from - beginning of file */ - unsigned long reloc_count; /* Number of relocation records */ - unsigned long flags; - unsigned long build_date; /* When the program/library was built */ - unsigned long filler[5]; /* Reservered, set to zero */ + __be32 stack_size; /* Size of stack, in bytes */ + __be32 reloc_start; /* Offset of relocation records from beginning of + file */ + __be32 reloc_count; /* Number of relocation records */ + __be32 flags; + __be32 build_date; /* When the program/library was built */ + __u32 filler[5]; /* Reservered, set to zero */ }; #define FLAT_FLAG_RAM 0x0001 /* load program entirely into RAM */ @@ -67,19 +67,19 @@ struct flat_hdr { #define OLD_FLAT_RELOC_TYPE_BSS 2 typedef union { - unsigned long value; + u32 value; struct { # if defined(mc68000) && !defined(CONFIG_COLDFIRE) - signed long offset : 30; - unsigned long type : 2; + s32 offset : 30; + u32 type : 2; # define OLD_FLAT_FLAG_RAM 0x1 /* load program entirely into RAM */ # elif defined(__BIG_ENDIAN_BITFIELD) - unsigned long type : 2; - signed long offset : 30; + u32 type : 2; + s32 offset : 30; # define OLD_FLAT_FLAG_RAM 0x1 /* load program entirely into RAM */ # elif defined(__LITTLE_ENDIAN_BITFIELD) - signed long offset : 30; - unsigned long type : 2; + s32 offset : 30; + u32 type : 2; # define OLD_FLAT_FLAG_RAM 0x1 /* load program entirely into RAM */ # else # error "Unknown bitfield order for flat files."