From patchwork Mon Dec 23 14:15:26 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kaixiong Yu X-Patchwork-Id: 13918899 Received: from szxga01-in.huawei.com (szxga01-in.huawei.com [45.249.212.187]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 406FB1C5F1F; Mon, 23 Dec 2024 14:19:59 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=45.249.212.187 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1734963601; cv=none; b=YnZXcfWkXNGQKqLgiqCFTwbBSJN5YE1eC4uGcXpOA2lsOKH/gjaYB+RqCn0dVvXY1HW+JY3nCRAYCqsUybHu1Bb4UUl5wstrb1TpexVGIazYOLn2xGTmGAhkl7jaoUdhs8eTWHCiLgZs8FnpVP1SJ1MwsHKmojp5xN+P7NY70Fs= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1734963601; c=relaxed/simple; bh=M3xZTu6EzZyd6n2YrYUR5sdHROdsWcbu6nDRtPtIFM8=; h=From:To:CC:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=m80mU/FBSWxn+M6W9zummN0KKyePHmo4X3IzrMWga3beR23FqEXjlroXL06b5RIV0s7fgBXKUweKisEBjEXvLvNjw9Wpp5kNveecg73QAsKaZStBhKAq9A/n3So94lSK0DuNo7dXeOUIxywr86ttfsbBpqq/c7TvZYxFPuABSGk= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=huawei.com; spf=pass smtp.mailfrom=huawei.com; arc=none smtp.client-ip=45.249.212.187 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=huawei.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=huawei.com Received: from mail.maildlp.com (unknown [172.19.163.252]) by szxga01-in.huawei.com (SkyGuard) with ESMTP id 4YH0TW251zzhZZ9; Mon, 23 Dec 2024 22:17:19 +0800 (CST) Received: from kwepemh100016.china.huawei.com (unknown [7.202.181.102]) by mail.maildlp.com (Postfix) with ESMTPS id 01A5C1800D1; Mon, 23 Dec 2024 22:19:57 +0800 (CST) Received: from huawei.com (10.175.113.32) by kwepemh100016.china.huawei.com (7.202.181.102) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1544.11; Mon, 23 Dec 2024 22:19:53 +0800 From: Kaixiong Yu To: , CC: , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , Subject: [PATCH v4 -next 07/15] security: min_addr: move sysctl to security/min_addr.c Date: Mon, 23 Dec 2024 22:15:26 +0800 Message-ID: <20241223141550.638616-8-yukaixiong@huawei.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20241223141550.638616-1-yukaixiong@huawei.com> References: <20241223141550.638616-1-yukaixiong@huawei.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-ClientProxiedBy: dggems702-chm.china.huawei.com (10.3.19.179) To kwepemh100016.china.huawei.com (7.202.181.102) The dac_mmap_min_addr belongs to min_addr.c, move it to min_addr.c from /kernel/sysctl.c. In the previous Linux kernel boot process, sysctl_init_bases needs to be executed before init_mmap_min_addr, So, register_sysctl_init should be executed before update_mmap_min_addr in init_mmap_min_addr. And according to the compilation condition in security/Makefile: obj-$(CONFIG_MMU) += min_addr.o if CONFIG_MMU is not defined, min_addr.c would not be included in the compilation process. So, drop the CONFIG_MMU check. Signed-off-by: Kaixiong Yu Reviewed-by: Kees Cook Acked-by: Paul Moore --- v4: - const qualify struct ctl_table min_addr_sysctl_table v3: - change the title v2: - update the changelog to explain why drop CONFIG_MMU check. --- --- kernel/sysctl.c | 9 --------- security/min_addr.c | 11 +++++++++++ 2 files changed, 11 insertions(+), 9 deletions(-) diff --git a/kernel/sysctl.c b/kernel/sysctl.c index 9c245898f535..62a58e417c40 100644 --- a/kernel/sysctl.c +++ b/kernel/sysctl.c @@ -2049,15 +2049,6 @@ static struct ctl_table vm_table[] = { .proc_handler = proc_dointvec_minmax, .extra1 = SYSCTL_ZERO, }, -#ifdef CONFIG_MMU - { - .procname = "mmap_min_addr", - .data = &dac_mmap_min_addr, - .maxlen = sizeof(unsigned long), - .mode = 0644, - .proc_handler = mmap_min_addr_handler, - }, -#endif #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \ (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL)) { diff --git a/security/min_addr.c b/security/min_addr.c index 0ce267c041ab..df1bc643d886 100644 --- a/security/min_addr.c +++ b/security/min_addr.c @@ -44,8 +44,19 @@ int mmap_min_addr_handler(const struct ctl_table *table, int write, return ret; } +static const struct ctl_table min_addr_sysctl_table[] = { + { + .procname = "mmap_min_addr", + .data = &dac_mmap_min_addr, + .maxlen = sizeof(unsigned long), + .mode = 0644, + .proc_handler = mmap_min_addr_handler, + }, +}; + static int __init init_mmap_min_addr(void) { + register_sysctl_init("vm", min_addr_sysctl_table); update_mmap_min_addr(); return 0;