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=-10.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS 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 E39CDC433B4 for ; Fri, 2 Apr 2021 18:11:27 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id A42D561163 for ; Fri, 2 Apr 2021 18:11:27 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235554AbhDBSL1 (ORCPT ); Fri, 2 Apr 2021 14:11:27 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37856 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229553AbhDBSLZ (ORCPT ); Fri, 2 Apr 2021 14:11:25 -0400 Received: from mail-pg1-x533.google.com (mail-pg1-x533.google.com [IPv6:2607:f8b0:4864:20::533]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D0783C0613E6 for ; Fri, 2 Apr 2021 11:11:23 -0700 (PDT) Received: by mail-pg1-x533.google.com with SMTP id k8so4011678pgf.4 for ; Fri, 02 Apr 2021 11:11:23 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; h=date:from:to:cc:subject:message-id:references:mime-version :content-disposition:in-reply-to; bh=HPk2Jv+QOKLY+FRZS5imorIT3+sz59DrrESicWBnBl0=; b=bfQ59yf7oyksMp5c1JmFl7BXoQq1cVTIsLo/kNC1mSw2yWQFNVsO4CFuilYbjeVmk0 4z/2HpjgSQ8P94cLhuJXo7U470eXeAbHLXQ/ZsUhjkSq0GG/dgF22e9LKvomdc++Nf8u kazjFb2exoCwj0GM4wd1syBMh6TZuDuXlNVPA= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to; bh=HPk2Jv+QOKLY+FRZS5imorIT3+sz59DrrESicWBnBl0=; b=UQCqvxe/As02v/o2gba2EZ5LLr22pRrjXtC4iH4cjsIY7VCvRSx7lHd/yd2cDmg2+E 6bpFbT9P4nrEgxbLoLUDkrjZHXExbr/ol9SfHvQcDCZtmZPEbSShJcEq7wF5CLHar1vv ntTPAG0qc7sBmFDvR6/x4OIo3OalWJJ1ZpoWY2B0afgpllpoYuan51SDNG5seeQVLjLp 4a5TlY6kRt5BWkTduGxd22CL3CQRY0oQatx7CfwPYNEEMK/3v/TIAhKDG9erqBHHgbT4 ixr9uoS2nQBT8/kG4D6cc3i82qJrcZYG518l6ZQ+owoXqcnKseW+TkzfJJaIllsIqAoP jtLQ== X-Gm-Message-State: AOAM533vd9zwqUwTTNro6w7vaEp4zZKd96FsIyq6tqCjxZpwYQ1/7GZ5 Yi8Qe//WKCQumpKlWSC/8WVBiQ== X-Google-Smtp-Source: ABdhPJwn5jY5k91Flu/zYyxodYLJmpRalm7vv1tvHlDQFyTz/WIl/aOA7olrpuU+vdYwKjLKIFl8Ag== X-Received: by 2002:a63:8c0b:: with SMTP id m11mr12737875pgd.306.1617387083370; Fri, 02 Apr 2021 11:11:23 -0700 (PDT) Received: from www.outflux.net (smtp.outflux.net. [198.145.64.163]) by smtp.gmail.com with ESMTPSA id q5sm8414578pfk.219.2021.04.02.11.11.22 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 02 Apr 2021 11:11:22 -0700 (PDT) Date: Fri, 2 Apr 2021 11:11:21 -0700 From: Kees Cook To: Josh Hunt Cc: Ingo Molnar , Peter Zijlstra , linux-kernel@vger.kernel.org, ebiederm@xmission.com, hannes@cmpxchg.org Subject: Re: [PATCH v2] psi: allow unprivileged users with CAP_SYS_RESOURCE to write psi files Message-ID: <202104021111.AA33CFC955@keescook> References: <20210402025833.27599-1-johunt@akamai.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20210402025833.27599-1-johunt@akamai.com> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Apr 01, 2021 at 10:58:33PM -0400, Josh Hunt wrote: > Currently only root can write files under /proc/pressure. Relax this to > allow tasks running as unprivileged users with CAP_SYS_RESOURCE to be > able to write to these files. > > Signed-off-by: Josh Hunt Reviewed-by: Kees Cook -- Kees Cook