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=-15.2 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_1 autolearn=ham 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 82BFFC433DB for ; Fri, 26 Mar 2021 00:43:56 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 4A53061A05 for ; Fri, 26 Mar 2021 00:43:56 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229900AbhCZAnY (ORCPT ); Thu, 25 Mar 2021 20:43:24 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42614 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229664AbhCZAmx (ORCPT ); Thu, 25 Mar 2021 20:42:53 -0400 Received: from mail-pj1-x1030.google.com (mail-pj1-x1030.google.com [IPv6:2607:f8b0:4864:20::1030]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3F8D3C06175F for ; Thu, 25 Mar 2021 17:42:53 -0700 (PDT) Received: by mail-pj1-x1030.google.com with SMTP id kr3-20020a17090b4903b02900c096fc01deso1645477pjb.4 for ; Thu, 25 Mar 2021 17:42:53 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel-dk.20150623.gappssmtp.com; s=20150623; h=to:cc:from:subject:message-id:date:user-agent:mime-version :content-language:content-transfer-encoding; bh=FRkAThF8DGg12CB1k3JLmbzczGDouY6nWnB+O1TTVWw=; b=OuN40zvIOYNUHtPvP0rNV8V/laC6xAF009VuLibLSfOWtP9dE4YLlsLsd9YCCXAFJL w1ySYDedI51vQER9vp2h1T2PRFPd1gWDB9I0xQce2YJ4/vl4vCFOM7Y7yFuaoeg2nyxu UaTOFgxBwMllXpSDp+EE5fSmYKO6dyTLfVDIoB2SnAG+30r+55nsumjGCX5+FnTSNwOp QE865krTn3qQ46NRzMWtvlWjHGhKnkhDwaQVeLLzei4FbhSB+Q+MOUfqokBCE1vm0IdX MTEg8zYzdz2fXeg+yedRYQR9mn+le+jlPad7Re2nGCdhJ5KpJl7KK6Ae8Lv/gHFyIy61 NJ4Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:to:cc:from:subject:message-id:date:user-agent :mime-version:content-language:content-transfer-encoding; bh=FRkAThF8DGg12CB1k3JLmbzczGDouY6nWnB+O1TTVWw=; b=Np2yY/FR/QqJyZLcG7rKRFjyGVdJPYKHmmHIKPvhBaqQa855n2aB5E6BC/orD8IYki EfVsRrcqgjuNt1BcZgTMVd1JHc/LD7yJ5tQlFDtDnkC4GXrUyNNXd+E8Zs/F2mwyLZ2E izAbIYxJkml8QPemK/04JGE/NNHUVe8Hf6o8SN/nsVZD4TbW7XVgoy8L74eM/0EtLt+j op9hGv0IWiOyNu6miTvWuv/qcPZ+qoM7m3NRu8fy54WYO/wCasxW1l4hVYVRDSi3tIs1 FFjXW9oszwUqd8ULd0jZAn40y0iza3dGok7PtREPb4n23p+/3mCsYPHLXhEo7XC5n1xb wpMg== X-Gm-Message-State: AOAM531MCDmIzQkITT3Zj0D2KQkMl8jFTbjX/0W+DxieDcy1z625whj3 GDwWTcmOJVCMpooXOBf85zFQKzoaLTN+nw== X-Google-Smtp-Source: ABdhPJx30s73JxY+7M8GjfzG7uo9gAtbadrYS04canCbpnVJJUAiHeHKwjUG21vHCZU6RZniFSTMsQ== X-Received: by 2002:a17:90a:c207:: with SMTP id e7mr11029490pjt.188.1616719372416; Thu, 25 Mar 2021 17:42:52 -0700 (PDT) Received: from [192.168.1.134] ([66.219.217.173]) by smtp.gmail.com with ESMTPSA id a21sm7031178pfk.83.2021.03.25.17.42.51 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 25 Mar 2021 17:42:51 -0700 (PDT) To: Casey Schaufler Cc: linux-security-module@vger.kernel.org, LKML From: Jens Axboe Subject: [PATCH] Revert "Smack: Handle io_uring kernel thread privileges" Message-ID: <04c7c410-08e8-626a-795e-b77db6666804@kernel.dk> Date: Thu, 25 Mar 2021 18:42:50 -0600 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This reverts commit 942cb357ae7d9249088e3687ee6a00ed2745a0c7. The io_uring PF_IO_WORKER threads no longer have PF_KTHREAD set, so no need to special case them for credential checks. Cc: Casey Schaufler Signed-off-by: Jens Axboe --- security/smack/smack_access.c | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-) diff --git a/security/smack/smack_access.c b/security/smack/smack_access.c index 7eabb448acab..efe2406a3960 100644 --- a/security/smack/smack_access.c +++ b/security/smack/smack_access.c @@ -688,10 +688,9 @@ bool smack_privileged_cred(int cap, const struct cred *cred) bool smack_privileged(int cap) { /* - * Kernel threads may not have credentials we can use. - * The io_uring kernel threads do have reliable credentials. + * All kernel tasks are privileged */ - if ((current->flags & (PF_KTHREAD | PF_IO_WORKER)) == PF_KTHREAD) + if (unlikely(current->flags & PF_KTHREAD)) return true; return smack_privileged_cred(cap, current_cred()); -- 2.31.0 -- Jens Axboe