From patchwork Mon Jul 29 11:52:52 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jinjie Ruan X-Patchwork-Id: 13744768 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 A0D6AC3DA4A for ; Mon, 29 Jul 2024 11:47:53 +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: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:In-Reply-To:References:List-Owner; bh=/mr3zInOnso5ZQmsjZ8UACiVfjHCD/WZYqmDmRmou8k=; b=eOQaVfUHK5Ft4vcg+JhlVhQOWu ZKZHh8rmbLhOXLVqa606BI2EZA/0RracmnIP/l3TqDmsJCfK1ziO3vMEAl33pH1WzjE55celbixTr ymvIkf4G1iffpuVB/eHg1KFDzKEFqnosVW/mcQasQ85oU9V6v2FtffkSJ29f2mpx539a1umQxTQz5 EFA1SYHw7meyONYg+3RpFVKBuhlIkeO/e5jWWbFarg6nnTq184hyX5qjIRAtfRw4CraTQLgKUsi06 ns40+U/X/rJZNXqGaWsfUQIr+5ynTkFCChjCzkiUz38Gzt6fcPWpgN/c10e3wK1kLljzFbW1yOA7T OFnChNrA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.97.1 #2 (Red Hat Linux)) id 1sYOqr-0000000B88A-2ZqM; Mon, 29 Jul 2024 11:47:41 +0000 Received: from szxga01-in.huawei.com ([45.249.212.187]) by bombadil.infradead.org with esmtps (Exim 4.97.1 #2 (Red Hat Linux)) id 1sYOqQ-0000000B81C-0ZDv; Mon, 29 Jul 2024 11:47:15 +0000 Received: from mail.maildlp.com (unknown [172.19.162.254]) by szxga01-in.huawei.com (SkyGuard) with ESMTP id 4WXc0Q6h5ZzyP1c; Mon, 29 Jul 2024 19:42:14 +0800 (CST) Received: from kwepemi100008.china.huawei.com (unknown [7.221.188.57]) by mail.maildlp.com (Postfix) with ESMTPS id 1A9691800D0; Mon, 29 Jul 2024 19:47:11 +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, 29 Jul 2024 19:47:10 +0800 From: Jinjie Ruan To: , , , , , , , , , , , CC: Subject: [PATCH v6 RESEND] crash: Fix crash memory reserve exceed system memory bug Date: Mon, 29 Jul 2024 19:52:52 +0800 Message-ID: <20240729115252.1659112-1-ruanjinjie@huawei.com> X-Mailer: git-send-email 2.34.1 MIME-Version: 1.0 X-Originating-IP: [10.90.53.73] X-ClientProxiedBy: dggems702-chm.china.huawei.com (10.3.19.179) 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-20240729_044714_339823_594831D5 X-CRM114-Status: GOOD ( 12.51 ) 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 On x86_32 Qemu machine with 1GB memory, the cmdline "crashkernel=4G" is ok as below: crashkernel reserved: 0x0000000020000000 - 0x0000000120000000 (4096 MB) It's similar on other architectures, such as ARM32 and RISCV32. 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 crash_size is greater than system RAM size and return error if so. After this patch, there is no above confusing reserve success info. Signed-off-by: Jinjie Ruan Suggested-by: Mike Rapoport Acked-by: Baoquan He Cc: Andrew Morton --- v6: - Take off Baoquan's Suggested-by. v5: - Fix it in common parse_crashkernel() instead of per-arch. - Add suggested-by. v4: - Update the warn info to align with parse_crashkernel_mem(). - Rebased on the "ARM: Use generic interface to simplify crashkernel reservation" patch. - Also fix for riscv32. - Update the commit message. v3: - Handle the check in reserve_crashkernel() Baoquan suggested. - Split x86_32 and arm32. - Add Suggested-by. - Drop the wrong fix tag. v2: - Also fix for x86_32. - Update the fix method. - Peel off the other two patches. - Update the commit message. --- kernel/crash_reserve.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/kernel/crash_reserve.c b/kernel/crash_reserve.c index ad5b3f2c5487..5387269114f6 100644 --- a/kernel/crash_reserve.c +++ b/kernel/crash_reserve.c @@ -335,6 +335,9 @@ int __init parse_crashkernel(char *cmdline, if (!*crash_size) ret = -EINVAL; + if (*crash_size >= system_ram) + ret = -EINVAL; + return ret; }