Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S934014AbaFSRNb (ORCPT ); Thu, 19 Jun 2014 13:13:31 -0400 Received: from mail-qa0-f51.google.com ([209.85.216.51]:40813 "EHLO mail-qa0-f51.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933410AbaFSRN3 (ORCPT ); Thu, 19 Jun 2014 13:13:29 -0400 Date: Thu, 19 Jun 2014 13:13:26 -0400 (EDT) From: Nicolas Pitre To: Rob Herring cc: Laura Abbott , Grant Likely , Rob Herring , Geert Uytterhoeven , "devicetree-discuss@lists.ozlabs.org" , "linux-kernel@vger.kernel.org" , "linux-arm-kernel@lists.infradead.org" Subject: Re: [PATCH] of: Check for phys_addr_t overflows in early_init_dt_add_memory_arch In-Reply-To: Message-ID: References: <1403154257-14591-1-git-send-email-lauraa@codeaurora.org> User-Agent: Alpine 2.11 (LFD 23 2013-08-11) MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, 19 Jun 2014, Rob Herring wrote: > On Thu, Jun 19, 2014 at 12:04 AM, Laura Abbott wrote: > > The common early_init_dt_add_memory_arch takes the base and size > > of a memory region as u64 types. The function never checks if > > the base and size can actually fit in a phys_addr_t which may > > be smaller than 64-bits. This may result in incorrect memory > > being passed to memblock_add if the memory falls outside the > > range of phys_addr_t. Add range checks for the base and size if > > phys_addr_t is smaller than u64. > > > > Reported-by: Geert Uytterhoeven > > Signed-off-by: Laura Abbott > > --- > > Geert, can you drop my other patch and give this a test to see if it fixes > > your bootup problem? > > > > --- > > drivers/of/fdt.c | 15 +++++++++++++++ > > 1 file changed, 15 insertions(+) > > > > diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c > > index c4cddf0..f72132c 100644 > > --- a/drivers/of/fdt.c > > +++ b/drivers/of/fdt.c > > @@ -880,6 +880,21 @@ void __init __weak early_init_dt_add_memory_arch(u64 base, u64 size) > > const u64 phys_offset = __pa(PAGE_OFFSET); > > base &= PAGE_MASK; > > size &= PAGE_MASK; > > + > > +#ifndef CONFIG_ARCH_PHYS_ADDR_T_64BIT > > + if (base > ULONG_MAX) { > > How about removing the ifdef and doing something like: > > if ((base >> 32) && (sizeof(phys_addr_t) != sizeof(u64))) That is what I was about to suggest as well. Except that I'd use sizeof(phys_addr_t) < sizeof(u64) just in case. Nicolas -- 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/