From nobody Wed Feb 11 20:55:53 2026 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id A6B54C77B78 for ; Wed, 3 May 2023 14:02:11 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230182AbjECOCK (ORCPT ); Wed, 3 May 2023 10:02:10 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34588 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230170AbjECOCH (ORCPT ); Wed, 3 May 2023 10:02:07 -0400 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id BD8BC5FD3 for ; Wed, 3 May 2023 07:01:24 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1683122483; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding; bh=9Il2Tq+zS33ksY9INyL3IhsljNXln+sovSvsBut32DE=; b=IF8b28f0yZJpzh+9B/TYlkY5ViL39w9jvkXOeiOMcFQx7bPiKoaNjDyCNczo8Kyb1reiNs 6xwMuA49bAEjY6bEyoSQUET/aSYVAmthUSp07TfIeyMPbDYiQ1YcD6BtdNQwT2PVfU2e3A YPmmChMC3YRirjqdanXl6dUX89MChec= Received: from mail-ej1-f70.google.com (mail-ej1-f70.google.com [209.85.218.70]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-490-zqXPoXx_O52LthbFquJypQ-1; Wed, 03 May 2023 10:01:21 -0400 X-MC-Unique: zqXPoXx_O52LthbFquJypQ-1 Received: by mail-ej1-f70.google.com with SMTP id a640c23a62f3a-94a34a0b75eso467689166b.1 for ; Wed, 03 May 2023 07:01:17 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1683122476; x=1685714476; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=9Il2Tq+zS33ksY9INyL3IhsljNXln+sovSvsBut32DE=; b=KTFaiCShRGlzwySMqX0mBr2w9psTx/W2GZequBY0y+nego8eufassYCN1CCRLhAr72 0dBUOAEvbbkNP8pwWo7getJ8M3uRrUYgAH84CQeSpZGHTGkult+ORCt081Yp9dt6zhwd xsrmb4Vo1aXu3kNpV7RTErJaiCIHm0f/HzPNX32RTVksznW1pSs2Ji+9BsHFUMm2dfJn CZHzBka7z6zW9t9BtgzYaL6tArItNUPdzOwcE2l/ZeRH22Md8ecv9Cwxfai8TmSpJd4/ 9q7gEeEQthoc9WJKfEPXbaCkHUNu5GCk2NRCKMAkeWOcxG7buo5mJnC/npePFekTx+QM I1Rg== X-Gm-Message-State: AC+VfDyjuzkkxtIfcssvDai9bpOQniUg3BBG4v/nJv2WFQLmEEfyuI87 8Evd0QIGgUAoIaW1tA2rgwPW2x5ony2Vt/ulBZTSmGGwDm/N7hMbTna+sjv3rEEELUKekbSA5JE CrTJYm4sCh3XEU/j2lF5S2Ctn X-Received: by 2002:a17:907:daa:b0:94f:3eec:f6b5 with SMTP id go42-20020a1709070daa00b0094f3eecf6b5mr3366048ejc.57.1683122476183; Wed, 03 May 2023 07:01:16 -0700 (PDT) X-Google-Smtp-Source: ACHHUZ7VGaXLvHuYIGWrNA1RjvkxhdE9GKsPgniiA5ySFOrm4GhYLdn+pfujLnUmJ0M1BEq8eVZZ4Q== X-Received: by 2002:a17:907:daa:b0:94f:3eec:f6b5 with SMTP id go42-20020a1709070daa00b0094f3eecf6b5mr3366020ejc.57.1683122475887; Wed, 03 May 2023 07:01:15 -0700 (PDT) Received: from localhost.localdomain (nat-pool-brq-t.redhat.com. [213.175.37.10]) by smtp.gmail.com with ESMTPSA id re4-20020a170906d8c400b0094a82a236cbsm17196221ejb.129.2023.05.03.07.01.14 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 03 May 2023 07:01:15 -0700 (PDT) From: Ondrej Mosnacek To: Steven Rostedt , Masami Hiramatsu Cc: linux-trace-kernel@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH] tracing: Fix permissions for the buffer_percent file Date: Wed, 3 May 2023 16:01:14 +0200 Message-Id: <20230503140114.3280002-1-omosnace@redhat.com> X-Mailer: git-send-email 2.40.1 MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" This file defines both read and write operations, yet it is being created as read-only. This means that it can't be written to without the CAP_DAC_OVERRIDE capability. Fix the permissions to allow root to write to it without the need to override DAC perms. Fixes: 03329f993978 ("tracing: Add tracefs file buffer_percentage") Signed-off-by: Ondrej Mosnacek --- kernel/trace/trace.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c index 45551c7b4c365..e278f4202a7ed 100644 --- a/kernel/trace/trace.c +++ b/kernel/trace/trace.c @@ -9655,7 +9655,7 @@ init_tracer_tracefs(struct trace_array *tr, struct de= ntry *d_tracer) =20 tr->buffer_percent =3D 50; =20 - trace_create_file("buffer_percent", TRACE_MODE_READ, d_tracer, + trace_create_file("buffer_percent", TRACE_MODE_WRITE, d_tracer, tr, &buffer_percent_fops); =20 create_trace_options_dir(tr); --=20 2.40.1