Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1946387AbWJTLza (ORCPT ); Fri, 20 Oct 2006 07:55:30 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1946390AbWJTLza (ORCPT ); Fri, 20 Oct 2006 07:55:30 -0400 Received: from mx2.suse.de ([195.135.220.15]:17874 "EHLO mx2.suse.de") by vger.kernel.org with ESMTP id S1946387AbWJTLz3 (ORCPT ); Fri, 20 Oct 2006 07:55:29 -0400 Date: Fri, 20 Oct 2006 13:55:27 +0200 From: Marcus Meissner To: Dave Jones , linux-kernel@vger.kernel.org, akpm@osdl.org, arjan@linux.intel.com Subject: [PATCH] binfmt_elf: randomize PIE binaries (2nd try) Message-ID: <20061020115527.GB14448@suse.de> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.5.9i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1187 Lines: 34 Randomizes -pie compiled binaries from PAGE_SIZE up to ELF_ET_DYN_BASE. 0 -> PAGE_SIZE is excluded to allow NULL ptr accesses to fail. Signed-off-by: Marcus Meissner ---- binfmt_elf.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) --- linux-2.6.18/fs/binfmt_elf.c.xx 2006-10-20 10:42:03.000000000 +0200 +++ linux-2.6.18/fs/binfmt_elf.c 2006-10-20 10:51:27.000000000 +0200 @@ -856,7 +856,13 @@ * default mmap base, as well as whatever program they * might try to exec. This is because the brk will * follow the loader, and is not movable. */ - load_bias = ELF_PAGESTART(ELF_ET_DYN_BASE - vaddr); + if (current->flags & PF_RANDOMIZE) + load_bias = randomize_range(PAGE_SIZE, + ELF_ET_DYN_BASE, + 0); + else + load_bias = ELF_ET_DYN_BASE; + load_bias = ELF_PAGESTART(load_bias - vaddr); } error = elf_map(bprm->file, load_bias + vaddr, elf_ppnt, - 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/