From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758191Ab3BNKMH (ORCPT ); Thu, 14 Feb 2013 05:12:07 -0500 Received: from fgwmail6.fujitsu.co.jp ([192.51.44.36]:48691 "EHLO fgwmail6.fujitsu.co.jp" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933943Ab3BNKMD (ORCPT ); Thu, 14 Feb 2013 05:12:03 -0500 From: HATAYAMA Daisuke Subject: [PATCH 03/13] vmcore: fill unused part of buffer for ELF headers with 0 To: ebiederm@xmission.com, vgoyal@redhat.com, cpw@sgi.com, kumagai-atsushi@mxc.nes.nec.co.jp, lisa.mitchell@hp.com Cc: kexec@lists.infradead.org, linux-kernel@vger.kernel.org Date: Thu, 14 Feb 2013 19:11:59 +0900 Message-ID: <20130214101159.22466.38580.stgit@localhost6.localdomain6> In-Reply-To: <20130214100945.22466.4172.stgit@localhost6.localdomain6> References: <20130214100945.22466.4172.stgit@localhost6.localdomain6> User-Agent: StGIT/0.14.3 MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Via mmap() we export the range [elfcorebuf_sz, roundup(elfcorebuf_sz, PAGE_SIZE)] to user-space. We need to fill this range with 0. Signed-off-by: HATAYAMA Daisuke --- fs/proc/vmcore.c | 5 +++++ 1 files changed, 5 insertions(+), 0 deletions(-) diff --git a/fs/proc/vmcore.c b/fs/proc/vmcore.c index 5010ead..43d338a 100644 --- a/fs/proc/vmcore.c +++ b/fs/proc/vmcore.c @@ -328,6 +328,11 @@ static int __init merge_note_headers_elf64(char *elfptr, size_t *elfsz, *elfsz = *elfsz - i; memmove(tmp, tmp+i, ((*elfsz)-sizeof(Elf64_Ehdr)-sizeof(Elf64_Phdr))); + /* Fill unused part with zero */ + memset(elfptr + sizeof(Elf64_Ehdr) + + (ehdr_ptr->e_phnum - nr_ptnote + 1) * sizeof(Elf64_Phdr), 0, + (nr_ptnote - 1) * sizeof(Elf64_Phdr)); + /* Modify e_phnum to reflect merged headers. */ ehdr_ptr->e_phnum = ehdr_ptr->e_phnum - nr_ptnote + 1;