From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758043Ab2KVVoB (ORCPT ); Thu, 22 Nov 2012 16:44:01 -0500 Received: from mail.kernel.org ([198.145.19.201]:49611 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755046Ab2KVSkZ (ORCPT ); Thu, 22 Nov 2012 13:40:25 -0500 From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Greg Kroah-Hartman , alan@lxorguk.ukuu.org.uk, Mohamed Pakkeer , Alex Elder , Sage Weil Subject: [ 169/171] ceph: avoid 32-bit page index overflow Date: Wed, 21 Nov 2012 16:41:55 -0800 Message-Id: <20121122004050.310082749@linuxfoundation.org> X-Mailer: git-send-email 1.8.0.197.g5a90748 In-Reply-To: <20121122004033.298367941@linuxfoundation.org> References: <20121122004033.298367941@linuxfoundation.org> User-Agent: quilt/0.60-2.1.2 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 3.4-stable review patch. If anyone has any objections, please let me know. ------------------ From: Alex Elder (cherry picked from commit 6285bc231277419255f3498d3eb5ddc9f8e7fe79) A pgoff_t is defined (by default) to have type (unsigned long). On architectures such as i686 that's a 32-bit type. The ceph address space code was attempting to produce 64 bit offsets by shifting a page's index by PAGE_CACHE_SHIFT, but the result was not what was desired because the shift occurred before the result got promoted to 64 bits. Fix this by converting all uses of page->index used in this way to use the page_offset() macro, which ensures the 64-bit result has the intended value. This fixes http://tracker.newdream.net/issues/3112 Reported-by: Mohamed Pakkeer Signed-off-by: Alex Elder Reviewed-by: Sage Weil Signed-off-by: Greg Kroah-Hartman --- fs/ceph/addr.c | 11 +++++------ 1 file changed, 5 insertions(+), 6 deletions(-) --- a/fs/ceph/addr.c +++ b/fs/ceph/addr.c @@ -205,7 +205,7 @@ static int readpage_nounlock(struct file dout("readpage inode %p file %p page %p index %lu\n", inode, filp, page, page->index); err = ceph_osdc_readpages(osdc, ceph_vino(inode), &ci->i_layout, - page->index << PAGE_CACHE_SHIFT, &len, + (u64) page_offset(page), &len, ci->i_truncate_seq, ci->i_truncate_size, &page, 1, 0); if (err == -ENOENT) @@ -286,7 +286,7 @@ static int start_read(struct inode *inod int nr_pages = 0; int ret; - off = page->index << PAGE_CACHE_SHIFT; + off = (u64) page_offset(page); /* count pages */ next_index = page->index; @@ -426,7 +426,7 @@ static int writepage_nounlock(struct pag struct ceph_inode_info *ci; struct ceph_fs_client *fsc; struct ceph_osd_client *osdc; - loff_t page_off = page->index << PAGE_CACHE_SHIFT; + loff_t page_off = page_offset(page); int len = PAGE_CACHE_SIZE; loff_t i_size; int err = 0; @@ -817,8 +817,7 @@ get_more_pages: /* ok */ if (locked_pages == 0) { /* prepare async write request */ - offset = (unsigned long long)page->index - << PAGE_CACHE_SHIFT; + offset = (u64) page_offset(page); len = wsize; req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout, @@ -1180,7 +1179,7 @@ static int ceph_page_mkwrite(struct vm_a struct inode *inode = vma->vm_file->f_dentry->d_inode; struct page *page = vmf->page; struct ceph_mds_client *mdsc = ceph_inode_to_client(inode)->mdsc; - loff_t off = page->index << PAGE_CACHE_SHIFT; + loff_t off = page_offset(page); loff_t size, len; int ret;