From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754549Ab2G3OPO (ORCPT ); Mon, 30 Jul 2012 10:15:14 -0400 Received: from terminus.zytor.com ([198.137.202.10]:45622 "EHLO terminus.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754446Ab2G3OPN (ORCPT ); Mon, 30 Jul 2012 10:15:13 -0400 Date: Mon, 30 Jul 2012 07:14:57 -0700 From: tip-bot for Oleg Nesterov Message-ID: Cc: linux-kernel@vger.kernel.org, anton@redhat.com, hpa@zytor.com, mingo@kernel.org, srikar@linux.vnet.ibm.com, oleg@redhat.com, tglx@linutronix.de Reply-To: mingo@kernel.org, hpa@zytor.com, anton@redhat.com, linux-kernel@vger.kernel.org, srikar@linux.vnet.ibm.com, tglx@linutronix.de, oleg@redhat.com In-Reply-To: <20120729182233.GA20339@redhat.com> References: <20120729182233.GA20339@redhat.com> To: linux-tip-commits@vger.kernel.org Subject: [tip:perf/core] uprobes: Fix overflow in vma_address()/ find_active_uprobe() Git-Commit-ID: aefd8933d445abf7ff0d4027c624737898827bcd X-Mailer: tip-git-log-daemon Robot-ID: Robot-Unsubscribe: Contact to get blacklisted from these emails MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain; charset=UTF-8 Content-Disposition: inline X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.2.6 (terminus.zytor.com [127.0.0.1]); Mon, 30 Jul 2012 07:15:03 -0700 (PDT) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Commit-ID: aefd8933d445abf7ff0d4027c624737898827bcd Gitweb: http://git.kernel.org/tip/aefd8933d445abf7ff0d4027c624737898827bcd Author: Oleg Nesterov AuthorDate: Sun, 29 Jul 2012 20:22:33 +0200 Committer: Ingo Molnar CommitDate: Mon, 30 Jul 2012 11:27:21 +0200 uprobes: Fix overflow in vma_address()/find_active_uprobe() vma->vm_pgoff is "unsigned long", it should be promoted to loff_t before the multiplication to avoid the overflow. Signed-off-by: Oleg Nesterov Acked-by: Srikar Dronamraju Cc: Anton Arapov Cc: Srikar Dronamraju Link: http://lkml.kernel.org/r/20120729182233.GA20339@redhat.com Signed-off-by: Ingo Molnar --- kernel/events/uprobes.c | 4 ++-- 1 files changed, 2 insertions(+), 2 deletions(-) diff --git a/kernel/events/uprobes.c b/kernel/events/uprobes.c index 9db9cdf..fb961d5 100644 --- a/kernel/events/uprobes.c +++ b/kernel/events/uprobes.c @@ -117,7 +117,7 @@ static loff_t vma_address(struct vm_area_struct *vma, loff_t offset) loff_t vaddr; vaddr = vma->vm_start + offset; - vaddr -= vma->vm_pgoff << PAGE_SHIFT; + vaddr -= (loff_t)vma->vm_pgoff << PAGE_SHIFT; return vaddr; } @@ -1450,7 +1450,7 @@ static struct uprobe *find_active_uprobe(unsigned long bp_vaddr, int *is_swbp) inode = vma->vm_file->f_mapping->host; offset = bp_vaddr - vma->vm_start; - offset += (vma->vm_pgoff << PAGE_SHIFT); + offset += (loff_t)vma->vm_pgoff << PAGE_SHIFT; uprobe = find_uprobe(inode, offset); }