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=-5.2 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_SANE_1 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 E6AA3C433ED for ; Sun, 11 Apr 2021 11:09:38 +0000 (UTC) Received: from lists.ozlabs.org (lists.ozlabs.org [112.213.38.117]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 99A1561008 for ; Sun, 11 Apr 2021 11:09:37 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 99A1561008 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=molgen.mpg.de Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Received: from boromir.ozlabs.org (localhost [IPv6:::1]) by lists.ozlabs.org (Postfix) with ESMTP id 4FJ8Jv642jz3bpZ for ; Sun, 11 Apr 2021 21:09:35 +1000 (AEST) Authentication-Results: lists.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=molgen.mpg.de (client-ip=141.14.17.11; helo=mx1.molgen.mpg.de; envelope-from=pmenzel@molgen.mpg.de; receiver=) Received: from mx1.molgen.mpg.de (mx3.molgen.mpg.de [141.14.17.11]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 4FJ8JZ0gXcz301C for ; Sun, 11 Apr 2021 21:09:15 +1000 (AEST) Received: from [192.168.178.35] (unknown [94.134.88.216]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) (Authenticated sender: pmenzel) by mx.molgen.mpg.de (Postfix) with ESMTPSA id 13BF5206473C4; Sun, 11 Apr 2021 13:09:08 +0200 (CEST) To: "Naveen N. Rao" , Sandipan Das From: Paul Menzel Subject: sysctl: setting key "net.core.bpf_jit_enable": Invalid argument Message-ID: <412d88b2-fa9a-149e-6f6e-3cfbce9edef0@molgen.mpg.de> Date: Sun, 11 Apr 2021 13:09:07 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.9.0 MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: it+linux-bpf@molgen.mpg.de, netdev@vger.kernel.org, bpf@vger.kernel.org, linuxppc-dev@lists.ozlabs.org Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" Dear Linux folks, Related to * [CVE-2021-29154] Linux kernel incorrect computation of branch displacements in BPF JIT compiler can be abused to execute arbitrary code in Kernel mode* [1], on the POWER8 system IBM S822LC with self-built Linux 5.12.0-rc5+, I am unable to disable `bpf_jit_enable`. $ /sbin/sysctl net.core.bpf_jit_enable net.core.bpf_jit_enable = 1 $ sudo /sbin/sysctl -w net.core.bpf_jit_enable=0 sysctl: setting key "net.core.bpf_jit_enable": Invalid argument It works on an x86 with Debian sid/unstable and Linux 5.10.26-1. Kind regards, Paul [1]: https://seclists.org/oss-sec/2021/q2/12