From patchwork Thu Jan 2 22:07:38 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Greg Kroah-Hartman X-Patchwork-Id: 234572 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=-9.8 required=3.0 tests=DKIMWL_WL_HIGH, DKIM_SIGNED, DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY, SPF_HELO_NONE, SPF_PASS, USER_AGENT_GIT autolearn=unavailable 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 24974C3276D for ; Thu, 2 Jan 2020 22:49:56 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id ECF7F217F4 for ; Thu, 2 Jan 2020 22:49:55 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1578005396; bh=MTf0aAiPTOiajZujZI+wd/PHq0w7Fnm3cm7lguMSgSo=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=LKDPSNrksL+FiVVtdguk/SladFXb6yhujb2qh27UT/KKN01P+/SBpxDBax7arBmDR y2b8jf58PjXFLe29JbVkjlD946MKZWbId00VYkfBhutrxE0/+AIBjRCnl3YMXc/W8d 1l/1qlqimEXYuiny5jVop5GeNtB2nMQecdmmb1zo= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729611AbgABW0H (ORCPT ); Thu, 2 Jan 2020 17:26:07 -0500 Received: from mail.kernel.org ([198.145.29.99]:52836 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729608AbgABW0G (ORCPT ); Thu, 2 Jan 2020 17:26:06 -0500 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id AE3112253D; Thu, 2 Jan 2020 22:26:05 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1578003966; bh=MTf0aAiPTOiajZujZI+wd/PHq0w7Fnm3cm7lguMSgSo=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=E4eA7nRurvHX27gn0j5WGOdvo7bNam+XJ7ga9yjnF30hASXJ4Q/hF0gRhlCM3HeYl uiSirQjpWQKn1+TalNXMR13HvURjLRE3KrqNdpf3/EYTC4O4CvoglnNsOjbBZ9HVdY qxPMzLSj7k41+nHOlgDWPPP0gNZNPy3K+IoG43uA= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Alexander Lobakin , Daniel Borkmann , Sasha Levin Subject: [PATCH 4.14 56/91] net, sysctl: Fix compiler warning when only cBPF is present Date: Thu, 2 Jan 2020 23:07:38 +0100 Message-Id: <20200102220439.135595611@linuxfoundation.org> X-Mailer: git-send-email 2.24.1 In-Reply-To: <20200102220356.856162165@linuxfoundation.org> References: <20200102220356.856162165@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Alexander Lobakin [ Upstream commit 1148f9adbe71415836a18a36c1b4ece999ab0973 ] proc_dointvec_minmax_bpf_restricted() has been firstly introduced in commit 2e4a30983b0f ("bpf: restrict access to core bpf sysctls") under CONFIG_HAVE_EBPF_JIT. Then, this ifdef has been removed in ede95a63b5e8 ("bpf: add bpf_jit_limit knob to restrict unpriv allocations"), because a new sysctl, bpf_jit_limit, made use of it. Finally, this parameter has become long instead of integer with fdadd04931c2 ("bpf: fix bpf_jit_limit knob for PAGE_SIZE >= 64K") and thus, a new proc_dolongvec_minmax_bpf_restricted() has been added. With this last change, we got back to that proc_dointvec_minmax_bpf_restricted() is used only under CONFIG_HAVE_EBPF_JIT, but the corresponding ifdef has not been brought back. So, in configurations like CONFIG_BPF_JIT=y && CONFIG_HAVE_EBPF_JIT=n since v4.20 we have: CC net/core/sysctl_net_core.o net/core/sysctl_net_core.c:292:1: warning: ‘proc_dointvec_minmax_bpf_restricted’ defined but not used [-Wunused-function] 292 | proc_dointvec_minmax_bpf_restricted(struct ctl_table *table, int write, | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Suppress this by guarding it with CONFIG_HAVE_EBPF_JIT again. Fixes: fdadd04931c2 ("bpf: fix bpf_jit_limit knob for PAGE_SIZE >= 64K") Signed-off-by: Alexander Lobakin Signed-off-by: Daniel Borkmann Link: https://lore.kernel.org/bpf/20191218091821.7080-1-alobakin@dlink.ru Signed-off-by: Sasha Levin --- net/core/sysctl_net_core.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/net/core/sysctl_net_core.c b/net/core/sysctl_net_core.c index 144cd1acd7e3..069e3c4fcc44 100644 --- a/net/core/sysctl_net_core.c +++ b/net/core/sysctl_net_core.c @@ -274,6 +274,7 @@ static int proc_dointvec_minmax_bpf_enable(struct ctl_table *table, int write, return ret; } +# ifdef CONFIG_HAVE_EBPF_JIT static int proc_dointvec_minmax_bpf_restricted(struct ctl_table *table, int write, void __user *buffer, size_t *lenp, @@ -284,6 +285,7 @@ proc_dointvec_minmax_bpf_restricted(struct ctl_table *table, int write, return proc_dointvec_minmax(table, write, buffer, lenp, ppos); } +# endif /* CONFIG_HAVE_EBPF_JIT */ static int proc_dolongvec_minmax_bpf_restricted(struct ctl_table *table, int write,