Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751579AbaDAMrN (ORCPT ); Tue, 1 Apr 2014 08:47:13 -0400 Received: from mail-yh0-f49.google.com ([209.85.213.49]:62998 "EHLO mail-yh0-f49.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750786AbaDAMrL (ORCPT ); Tue, 1 Apr 2014 08:47:11 -0400 MIME-Version: 1.0 Date: Tue, 1 Apr 2014 09:47:09 -0300 Message-ID: Subject: [RFC] Only a.out QMAGIC format is working From: =?ISO-8859-1?Q?Geyslan_Greg=F3rio_Bem?= To: LKML , Alexander Viro Cc: "open list:FILESYSTEMS (VFS...), linux-kernel@vger.kernel.org (open list)" , kernel-br , kernelnewbies Content-Type: text/plain; charset=ISO-8859-1 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Sirs, I was researching about old binary formats and did some tests. Meantime, I was able to run sucessfully only the QMAGIC format. Nonetheless, the OMAGIC, NMAGIC and ZMAGIC didn't work anymore. The test occurred using old slackware binaries and some new, the latter compiled by me, using cross-compiled as and ld. In any case, the QMAGIC was the only functional. After some debugging I identified (when loading a OMAGIC) that the kernel sigkill the current after this checking: http://lxr.linux.no/linux+v3.13.5/arch/x86/ia32/ia32_aout.c#L325 325 error = vm_brk(text_addr & PAGE_MASK, map_size); 326 327 if (error != (text_addr & PAGE_MASK)) { 328 send_sig(SIGKILL, current, 0); 329 return error; 330 } I suppose this happens due to changes made, in the course of time, in the memory mapping (vm_brk/do_brk), therefore the only one that still works is the QMAGIC (the aligned one). Or maybe, it's purposely. [RFC] Is important to note that when a ZMAGIC is loaded what happens is a "Segmentation fault" and not "SIGKILL". That was reported by others too: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/966472 -- Regards, Geyslan G. Bem hackingbits.com -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/