From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933929Ab3BNKL7 (ORCPT ); Thu, 14 Feb 2013 05:11:59 -0500 Received: from fgwmail6.fujitsu.co.jp ([192.51.44.36]:48688 "EHLO fgwmail6.fujitsu.co.jp" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933850Ab3BNKL4 (ORCPT ); Thu, 14 Feb 2013 05:11:56 -0500 From: HATAYAMA Daisuke Subject: [PATCH 02/13] vmcore: round up buffer size of ELF headers by PAGE_SIZE 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 19:11:54 +0900 Message-ID: <20130214101154.22466.21769.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 To satisfy mmap() page-size boundary requirement, reound up buffer size of ELF headers by PAGE_SIZE. The resulting value becomes offset of ELF note segments and it's assigned in unique PT_NOTE program header entry. Also, some part that assumes past ELF headers' size is replaced by this new rounded-up value. Signed-off-by: HATAYAMA Daisuke --- fs/proc/vmcore.c | 9 +++++---- 1 files changed, 5 insertions(+), 4 deletions(-) diff --git a/fs/proc/vmcore.c b/fs/proc/vmcore.c index 85714c3..5010ead 100644 --- a/fs/proc/vmcore.c +++ b/fs/proc/vmcore.c @@ -313,7 +313,7 @@ static int __init merge_note_headers_elf64(char *elfptr, size_t *elfsz, phdr.p_flags = 0; note_off = sizeof(Elf64_Ehdr) + (ehdr_ptr->e_phnum - nr_ptnote +1) * sizeof(Elf64_Phdr); - phdr.p_offset = note_off; + phdr.p_offset = roundup(note_off, PAGE_SIZE); phdr.p_vaddr = phdr.p_paddr = 0; phdr.p_filesz = phdr.p_memsz = phdr_sz; phdr.p_align = 0; @@ -331,6 +331,8 @@ static int __init merge_note_headers_elf64(char *elfptr, size_t *elfsz, /* Modify e_phnum to reflect merged headers. */ ehdr_ptr->e_phnum = ehdr_ptr->e_phnum - nr_ptnote + 1; + *elfsz = roundup(*elfsz, PAGE_SIZE); + return 0; } @@ -431,9 +433,8 @@ static int __init process_ptload_program_headers_elf64(char *elfptr, phdr_ptr = (Elf64_Phdr*)(elfptr + sizeof(Elf64_Ehdr)); /* PT_NOTE hdr */ /* First program header is PT_NOTE header. */ - vmcore_off = sizeof(Elf64_Ehdr) + - (ehdr_ptr->e_phnum) * sizeof(Elf64_Phdr) + - phdr_ptr->p_memsz; /* Note sections */ + vmcore_off = phdr_ptr->p_offset + roundup(phdr_ptr->p_memsz, + PAGE_SIZE); for (i = 0; i < ehdr_ptr->e_phnum; i++, phdr_ptr++) { if (phdr_ptr->p_type != PT_LOAD)