From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-13.1 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 944D7C00A89 for ; Tue, 3 Nov 2020 01:26:06 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 4F49F222B9 for ; Tue, 3 Nov 2020 01:26:06 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1604366766; bh=z7fMtB+yMjM2cKB6PTuRDtmNHoP1WRrbUz5QVEx2PnE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=sOXBPzimyH3+a4e7d0j5qmG79f0jPHJLVbiktGm9O2eFq09WF4wkHPTgO+Dhk/oBS Sqh9muOtLjnS2g3LcRdXrsek57jUk+AK7nn0H/Uh3NTLz34tjJ8wnasbv30hKbiK7E l/Z/P2S0tPOhu5baag0dGP4Zv5bGXmrsBJ1ug/iQ= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727886AbgKCB0F (ORCPT ); Mon, 2 Nov 2020 20:26:05 -0500 Received: from mail.kernel.org ([198.145.29.99]:33746 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727849AbgKCBTl (ORCPT ); Mon, 2 Nov 2020 20:19:41 -0500 Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 6CEEE222EC; Tue, 3 Nov 2020 01:19:40 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1604366381; bh=z7fMtB+yMjM2cKB6PTuRDtmNHoP1WRrbUz5QVEx2PnE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=VmQippCJP1UkPgrQ6c1LUp9zvoFIQRztIUHvQRc+ooLdbhS3UOW+9rerE58Xnpi07 JMTvxREmY0XasiyEs/xnfuv6aevM91NRxGODutiWnutZ7HwhkjoiK5vdi6LrgwVo3d YPTB6QLM3nWVaFRbLGMNTC+YJhDBcqK80ByDvRDQ= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Vincent Whitchurch , Rob Herring , Sasha Levin , devicetree@vger.kernel.org Subject: [PATCH AUTOSEL 5.8 09/29] of: Fix reserved-memory overlap detection Date: Mon, 2 Nov 2020 20:19:08 -0500 Message-Id: <20201103011928.183145-9-sashal@kernel.org> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20201103011928.183145-1-sashal@kernel.org> References: <20201103011928.183145-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Vincent Whitchurch [ Upstream commit ca05f33316559a04867295dd49f85aeedbfd6bfd ] The reserved-memory overlap detection code fails to detect overlaps if either of the regions starts at address 0x0. The code explicitly checks for and ignores such regions, apparently in order to ignore dynamically allocated regions which have an address of 0x0 at this point. These dynamically allocated regions also have a size of 0x0 at this point, so fix this by removing the check and sorting the dynamically allocated regions ahead of any static regions at address 0x0. For example, there are two overlaps in this case but they are not currently reported: foo@0 { reg = <0x0 0x2000>; }; bar@0 { reg = <0x0 0x1000>; }; baz@1000 { reg = <0x1000 0x1000>; }; quux { size = <0x1000>; }; but they are after this patch: OF: reserved mem: OVERLAP DETECTED! bar@0 (0x00000000--0x00001000) overlaps with foo@0 (0x00000000--0x00002000) OF: reserved mem: OVERLAP DETECTED! foo@0 (0x00000000--0x00002000) overlaps with baz@1000 (0x00001000--0x00002000) Signed-off-by: Vincent Whitchurch Link: https://lore.kernel.org/r/ded6fd6b47b58741aabdcc6967f73eca6a3f311e.1603273666.git-series.vincent.whitchurch@axis.com Signed-off-by: Rob Herring Signed-off-by: Sasha Levin --- drivers/of/of_reserved_mem.c | 13 +++++++++++-- 1 file changed, 11 insertions(+), 2 deletions(-) diff --git a/drivers/of/of_reserved_mem.c b/drivers/of/of_reserved_mem.c index 6877080c8af93..1e956729bad01 100644 --- a/drivers/of/of_reserved_mem.c +++ b/drivers/of/of_reserved_mem.c @@ -200,6 +200,16 @@ static int __init __rmem_cmp(const void *a, const void *b) if (ra->base > rb->base) return 1; + /* + * Put the dynamic allocations (address == 0, size == 0) before static + * allocations at address 0x0 so that overlap detection works + * correctly. + */ + if (ra->size < rb->size) + return -1; + if (ra->size > rb->size) + return 1; + return 0; } @@ -217,8 +227,7 @@ static void __init __rmem_check_for_overlap(void) this = &reserved_mem[i]; next = &reserved_mem[i + 1]; - if (!(this->base && next->base)) - continue; + if (this->base + this->size > next->base) { phys_addr_t this_end, next_end; -- 2.27.0