Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753503Ab3CEHFQ (ORCPT ); Tue, 5 Mar 2013 02:05:16 -0500 Received: from fgwmail6.fujitsu.co.jp ([192.51.44.36]:50353 "EHLO fgwmail6.fujitsu.co.jp" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752467Ab3CEHFM (ORCPT ); Tue, 5 Mar 2013 02:05:12 -0500 From: HATAYAMA Daisuke Subject: [PATCH v2 03/20] vmcore, sysfs: export ELF note segment size instead of vmcoreinfo data size To: vgoyal@redhat.com, ebiederm@xmission.com, cpw@sgi.com, kumagai-atsushi@mxc.nes.nec.co.jp, lisa.mitchell@hp.com, heiko.carstens@de.ibm.com, akpm@linux-foundation.org Cc: kexec@lists.infradead.org, linux-kernel@vger.kernel.org Date: Sat, 02 Mar 2013 17:36:05 +0900 Message-ID: <20130302083605.31252.26646.stgit@localhost6.localdomain6> In-Reply-To: <20130302083447.31252.93914.stgit@localhost6.localdomain6> References: <20130302083447.31252.93914.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 Content-Length: 1290 Lines: 35 p_memsz member of program header entry with PT_NOTE type needs to have size of the corresponding ELF note segment. Currently, vmcoreinfo exports data part only. If vmcoreinfo reachs vmcoreinfo_max_size, then in merge_note_headers_elf{32,64}, empty ELF note header cannot be found or buffer overrun can happen. Note: kexec-tools assigns PAGE_SIZE to p_memsz for other ELF note types. Due to the above reason, the same issue occurs if actual ELF note data exceeds (PAGE_SIZE - 2 * KEXEC_NOTE_HEAD_BYTES). Signed-off-by: HATAYAMA Daisuke --- kernel/ksysfs.c | 2 +- 1 files changed, 1 insertions(+), 1 deletions(-) diff --git a/kernel/ksysfs.c b/kernel/ksysfs.c index 6ada93c..97d2763 100644 --- a/kernel/ksysfs.c +++ b/kernel/ksysfs.c @@ -126,7 +126,7 @@ static ssize_t vmcoreinfo_show(struct kobject *kobj, { return sprintf(buf, "%lx %x\n", paddr_vmcoreinfo_note(), - (unsigned int)vmcoreinfo_max_size); + (unsigned int)sizeof(vmcoreinfo_note)); } KERNEL_ATTR_RO(vmcoreinfo); -- 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/