From patchwork Mon Jul 22 03:57:01 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jinjie Ruan X-Patchwork-Id: 13738229 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id C8992C3DA5D for ; Mon, 22 Jul 2024 03:53:07 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Type: Content-Transfer-Encoding:MIME-Version:References:In-Reply-To:Message-ID:Date :Subject:CC:To:From:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=d8IM41/IePDrmjlwjR+KDcXRMipYSax/3Dfo52NbYaI=; b=x32MiWmDYqO34F+WoeTOp7LN2d wj8l27nKnza7wihguMvWz6Tp6TQ141UqKxrhANKgCcfEZcH6w6hBcM/faQx6g3+cdgTlYeRZTd619 hOU5drLikwSoiDk7467gKl418vw/RwW/t/MvddTGq4i5kI+JtZlTpsW609PhVeMWS2/3Y5MQ0Sw/A 3089LkpBjjJcKKfQ0AeihOBixC9BC52+gL1QPJSwxxlZUP//Fy0ohoW1nWpHrzB8paLODoysQ++iu W4EoUOqMU/BWWN/19jN/B1GrmgWytzch0A9KrCKixAviqGNw7z0F0NdDB0ljkMd/E4y+zs7TmojB7 JVbr7Osw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.97.1 #2 (Red Hat Linux)) id 1sVk6a-00000008F2D-1DgQ; Mon, 22 Jul 2024 03:52:56 +0000 Received: from szxga04-in.huawei.com ([45.249.212.190]) by bombadil.infradead.org with esmtps (Exim 4.97.1 #2 (Red Hat Linux)) id 1sVk5u-00000008EnS-0dls; Mon, 22 Jul 2024 03:52:15 +0000 Received: from mail.maildlp.com (unknown [172.19.163.17]) by szxga04-in.huawei.com (SkyGuard) with ESMTP id 4WS5pB6SQcz2ClNw; Mon, 22 Jul 2024 11:47:46 +0800 (CST) Received: from kwepemi100008.china.huawei.com (unknown [7.221.188.57]) by mail.maildlp.com (Postfix) with ESMTPS id B63621A0188; Mon, 22 Jul 2024 11:52:09 +0800 (CST) Received: from huawei.com (10.90.53.73) by kwepemi100008.china.huawei.com (7.221.188.57) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.1.2507.39; Mon, 22 Jul 2024 11:52:08 +0800 From: Jinjie Ruan To: , , , , , , , , , , , , , , , , , , , , , , , , , , CC: Subject: [PATCH v4 3/3] riscv: kdump: Fix crash memory reserve exceed system memory bug Date: Mon, 22 Jul 2024 11:57:01 +0800 Message-ID: <20240722035701.696874-4-ruanjinjie@huawei.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240722035701.696874-1-ruanjinjie@huawei.com> References: <20240722035701.696874-1-ruanjinjie@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.90.53.73] X-ClientProxiedBy: dggems704-chm.china.huawei.com (10.3.19.181) To kwepemi100008.china.huawei.com (7.221.188.57) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240721_205214_372361_5F90D6DC X-CRM114-Status: GOOD ( 10.07 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Similar with x86_32, on Riscv32 Qemu "virt" machine with 1GB memory, the crash kernel "crashkernel=4G" is ok as below: crashkernel reserved: 0x00000000bf400000 - 0x00000001bf400000 (4096 MB) The cause is that the crash_size is parsed and printed with "unsigned long long" data type which is 8 bytes but allocated used with "phys_addr_t" which is 4 bytes in memblock_phys_alloc_range(). Fix it by checking if the crash_size is greater than system RAM size and warn out as parse_crashkernel_mem() do it if so. After this patch, it fails and there is no above confusing reserve success info. Signed-off-by: Jinjie Ruan --- arch/riscv/mm/init.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/arch/riscv/mm/init.c b/arch/riscv/mm/init.c index bfa2dea95354..5d66a4937fcd 100644 --- a/arch/riscv/mm/init.c +++ b/arch/riscv/mm/init.c @@ -1381,6 +1381,11 @@ static void __init arch_reserve_crashkernel(void) if (ret) return; + if (crash_size >= memblock_phys_mem_size()) { + pr_warn("Crashkernel: invalid size."); + return; + } + reserve_crashkernel_generic(cmdline, crash_size, crash_base, low_size, high); }