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[209.132.180.67]) by mx.google.com with ESMTP id d25si9789076pgb.229.2019.04.03.17.36.25; Wed, 03 Apr 2019 17:36:40 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; dkim=pass header.i=@google.com header.s=20161025 header.b="IRAlL/xF"; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=REJECT sp=REJECT dis=NONE) header.from=google.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727042AbfDDAfR (ORCPT + 99 others); Wed, 3 Apr 2019 20:35:17 -0400 Received: from mail-vk1-f202.google.com ([209.85.221.202]:51567 "EHLO mail-vk1-f202.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726721AbfDDAdN (ORCPT ); Wed, 3 Apr 2019 20:33:13 -0400 Received: by mail-vk1-f202.google.com with SMTP id r14so423203vkd.18 for ; Wed, 03 Apr 2019 17:33:12 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=date:in-reply-to:message-id:mime-version:references:subject:from:to :cc; bh=iaaF5/aYD/K1PTKwNLEWQdX8WLqLGYfc09hndKsTKvo=; b=IRAlL/xFWhgbbpXtzjS8gWTXeZcNeEhAKd8NbdYGUmAEC44bgqLt8+paigb80y/Q0j EhV7F6H8vUaAzgky2cnEOMhIdDbk1k6Fv6F3Q+LIf2cT/CCUnf4GmpjSJPMvtiH2tkYG DcvYmZAKAj6LnpeL7LtQoyvQ58e3LcxfNJMrANWVlrJGynzrJEELOa5/D8v4unQ04F0D cWPZYcEadltcA9SHWmsAWpxyXliB1Rlsqv+3CXICyR9weXkQOfvfgDs2Jchw2Pd86cwk o2v5txavD8MqgJlM6iqRLbj4+x1qUHY1kEoEM3vxd8y+jE4rxGz4Mlc1IRFvNTCy9Ro5 60Wg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:in-reply-to:message-id:mime-version :references:subject:from:to:cc; bh=iaaF5/aYD/K1PTKwNLEWQdX8WLqLGYfc09hndKsTKvo=; b=htIQ2MPmaw3qEk3naj+i05dVtcr9BNNNyCQ7T5+SdhuSZ67NsxpLIwowptLQmW4TEX 5RfQ5Qu+2Pr49dW80rDWoxDTY5zWqxdVu9SZY1mp68mseKtWeY97ZjekU8qDsEXebNLi xMDJfUSKhwryL+6G1+NIvPLEyVqyuii5Lo3hOXdTGwvF3Y1Usykd2831JVxhhe7S0llq LRB4D3Xo/3PhPfLzmYDkGkcxosOwCxIfKTEF6qYUayZ6hnS+6rGCok1E7cqdKroa0g0X a0e8hfKpGJ+Hpr79gMugid6w7Ae8cwPK2Qe9fO9EK4Qe2XCxDxYprKwPO52HbjtdprhK W1cQ== X-Gm-Message-State: APjAAAU+0NX4XGa0WqQyfIoyLrB2kaH0/TPvtoZIYrhK/uZ0uVoRvPp0 qPJU6or3bz6u1cYjYVxOK4D30zrXhxyKQoIXN3TYvQ== X-Received: by 2002:a1f:1b82:: with SMTP id b124mr367884vkb.11.1554337992127; Wed, 03 Apr 2019 17:33:12 -0700 (PDT) Date: Wed, 3 Apr 2019 17:32:29 -0700 In-Reply-To: <20190404003249.14356-1-matthewgarrett@google.com> Message-Id: <20190404003249.14356-8-matthewgarrett@google.com> Mime-Version: 1.0 References: <20190404003249.14356-1-matthewgarrett@google.com> X-Mailer: git-send-email 2.21.0.392.gf8f6787159e-goog Subject: [PATCH V32 07/27] kexec_file: Restrict at runtime if the kernel is locked down From: Matthew Garrett To: jmorris@namei.org Cc: linux-security-module@vger.kernel.org, linux-kernel@vger.kernel.org, dhowells@redhat.com, linux-api@vger.kernel.org, luto@kernel.org, Jiri Bohac , Matthew Garrett , kexec@lists.infradead.org Content-Type: text/plain; charset="UTF-8" Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Jiri Bohac When KEXEC_SIG is not enabled, kernel should not load images through kexec_file systemcall if the kernel is locked down. [Modified by David Howells to fit with modifications to the previous patch and to return -EPERM if the kernel is locked down for consistency with other lockdowns. Modified by Matthew Garrett to remove the IMA integration, which will be replaced by integrating with the IMA architecture policy patches.] Signed-off-by: Jiri Bohac Signed-off-by: David Howells Signed-off-by: Matthew Garrett Reviewed-by: Jiri Bohac cc: kexec@lists.infradead.org --- kernel/kexec_file.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/kernel/kexec_file.c b/kernel/kexec_file.c index 67f3a866eabe..a1cc37c8b43b 100644 --- a/kernel/kexec_file.c +++ b/kernel/kexec_file.c @@ -239,6 +239,12 @@ kimage_file_prepare_segments(struct kimage *image, int kernel_fd, int initrd_fd, } ret = 0; + + if (kernel_is_locked_down(reason, LOCKDOWN_INTEGRITY)) { + ret = -EPERM; + goto out; + } + break; /* All other errors are fatal, including nomem, unparseable -- 2.21.0.392.gf8f6787159e-goog