Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757318AbaFSFEY (ORCPT ); Thu, 19 Jun 2014 01:04:24 -0400 Received: from smtp.codeaurora.org ([198.145.11.231]:52736 "EHLO smtp.codeaurora.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757231AbaFSFEX (ORCPT ); Thu, 19 Jun 2014 01:04:23 -0400 From: Laura Abbott To: Grant Likely , Rob Herring , Geert Uytterhoeven Cc: Laura Abbott , devicetree-discuss@lists.ozlabs.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org Subject: [PATCH] of: Check for phys_addr_t overflows in early_init_dt_add_memory_arch Date: Wed, 18 Jun 2014 22:04:17 -0700 Message-Id: <1403154257-14591-1-git-send-email-lauraa@codeaurora.org> X-Mailer: git-send-email 1.8.2.1 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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) { + pr_warning("Ignoring memory block 0x%llx - 0x%llx\n", + base, base + size); + return; + } + + if (base + size > ULONG_MAX) { + pr_warning("Ignoring memory range 0x%lx - 0x%llx\n", + ULONG_MAX, base + size); + size = ULONG_MAX - base; + } +#endif + if (base + size < phys_offset) { pr_warning("Ignoring memory block 0x%llx - 0x%llx\n", base, base + size); -- The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum, hosted by The Linux Foundation -- 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/