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=-3.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS autolearn=no 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 03727C47083 for ; Mon, 24 May 2021 09:02:17 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D5FF661354 for ; Mon, 24 May 2021 09:02:16 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232318AbhEXJDn (ORCPT ); Mon, 24 May 2021 05:03:43 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42856 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232449AbhEXJDn (ORCPT ); Mon, 24 May 2021 05:03:43 -0400 Received: from mail-pl1-x634.google.com (mail-pl1-x634.google.com [IPv6:2607:f8b0:4864:20::634]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 693BAC061756 for ; Mon, 24 May 2021 02:02:14 -0700 (PDT) Received: by mail-pl1-x634.google.com with SMTP id b7so10139996plg.0 for ; Mon, 24 May 2021 02:02:14 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bytedance-com.20150623.gappssmtp.com; s=20150623; h=from:content-transfer-encoding:mime-version:subject:message-id:date :cc:to; bh=iPvQM7Ju1ffWKIo+8yldAlBUkBMS+sJNZu1vYtZK95Y=; b=yIcCS+Cbcf4SQbB2ozxN/mlL7P4irXdIn7392izp1/M0hZPWyJmx5Mnf6JwadtddWU TCkMwGtLO+7KYH+JpjZjYgfdzdM8nRuV9dOaCvCOD4nO/LZjHdJ2SecQs69SNLfi65Y8 bqJdj5C9wc1QwY/z+pVa3ItifpQ/iGqZ0y5ISArHIo6ecofDch0FIOAdoV2ETbmFhCXL 7oqzcPtKdvDmjgYT4h/DHcjVNb4Rf1ViFcLzu52Jzm4/YXxT6r0sifDo2gEBf2pMjV2R O6mWqBwOZn3K/laIlYa3NqHNuXXF1xkkW3TdrA53cAsbE+6SaWovnRNyfniUnk2Q65oB dUxQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:content-transfer-encoding:mime-version :subject:message-id:date:cc:to; bh=iPvQM7Ju1ffWKIo+8yldAlBUkBMS+sJNZu1vYtZK95Y=; b=Ub47LmBhrutduZbROBnFFMQlIMEJoNGb1vDr2S42RwAEkKcXLl2kqrjwqBLi1lXL6F Fa/sV8zjoDWwW917FvoQsSvLqm6p400S4yzAnkfgDJxZ77bwx7Zj29MXhAuIyFB6Ip/6 AKcGxaIVUdPS5SFghqPWA87LCTuiuZiKowSm+Dr0f3RCfg+8uBCtVsXf01haWgG8/2ku +n2g1/LklSJKkGrwA8/ExYeDyTFE9k19qjgm9m4l+VJ/rUKyyq85ljyjdv9HxX8IltkO QK+5p6yIv9YxZRXniVS78mTgJ8ja+ilMEirjsY/LyP47lb1XDYza9568PpVUFPdGem/3 g6KA== X-Gm-Message-State: AOAM53365mHwmRTVPcQqho5UEJ/4ZYpD8+4OOedwJiymJHzSfjQI9LIg i5qEpvsRx8qvQmBWAWpAbAOR1g== X-Google-Smtp-Source: ABdhPJxW3Ih0kl/t8C0f7Wph1i/gPeyb71D336JNHAC/M7n6qXeQx4sBV+IJSEb5+uqi9NQU7eRRDw== X-Received: by 2002:a17:903:1cd:b029:f0:c1c2:9e75 with SMTP id e13-20020a17090301cdb02900f0c1c29e75mr24517969plh.54.1621846933651; Mon, 24 May 2021 02:02:13 -0700 (PDT) Received: from smtpclient.apple ([139.177.225.224]) by smtp.gmail.com with ESMTPSA id a65sm9098526pfb.177.2021.05.24.02.02.10 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Mon, 24 May 2021 02:02:13 -0700 (PDT) From: Chunxin Zang Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: quoted-printable Mime-Version: 1.0 (Mac OS X Mail 14.0 \(3654.80.0.2.43\)) Subject: =?utf-8?Q?Documentation/admin-guide/module-signing=2Erst=3A_Does_?= =?utf-8?Q?the_function_of_adding_a_key_to_=E2=80=98Builtin=5Ftrusted=5Fke?= =?utf-8?Q?y=E2=80=99_work=3F?= Message-Id: <49DB247F-F485-45D5-87F9-4FCB85CB7767@bytedance.com> Date: Mon, 24 May 2021 17:02:07 +0800 Cc: keyrings@vger.kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org To: dhowells@redhat.com, dwmw2@infradead.org, corbet@lwn.net X-Mailer: Apple Mail (2.3654.80.0.2.43) Precedence: bulk List-ID: X-Mailing-List: keyrings@vger.kernel.org Recently, I am learning how to use module signature. But I got 'Permission denied' when I trying to add a=20 public key to the 'builtin_trusted_keys' keyring. root@:~# cat /proc/keys 3471e123 I------ 1 perm 1f030000 0 0 asymmetri Build time = autogenerated kernel key: xxxx: X509.rsa xxxx [] 37e8db03 I------ 1 perm 1f0b0000 0 0 keyring = .builtin_trusted_keys: 1 root@:~# keyctl padd asymmetric "" 0x37e8db03 < = ./signing_key_test_sign.x509 add_key: Permission denied The reason is the 'builtin_trusted_keys' keyring's perm was set=20 '1f0b0000' by below operate when kernel starting.=20 builtin_trusted_keys =3D keyring_alloc(".builtin_trusted_keys", KUIDT_INIT(0), KGIDT_INIT(0), = current_cred(), ((KEY_POS_ALL & ~KEY_POS_SETATTR) |=20 KEY_USR_VIEW | KEY_USR_READ | = KEY_USR_SEARCH), KEY_ALLOC_NOT_IN_QUOTA, NULL, NULL); And, 'add_key' interface pass the KEY_NEED_WRITE perm to lookup_user_key.=20 So -EACCES returned in key_task_permission check. Is there something wrong in module-signing.rst ? Or I missed some information about it. Best wishes Chunxin=