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 Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id 89D46ECAAA1 for ; Mon, 31 Oct 2022 22:10:43 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 1A8796B0072; Mon, 31 Oct 2022 18:10:43 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 156CD6B0073; Mon, 31 Oct 2022 18:10:43 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 045F56B0074; Mon, 31 Oct 2022 18:10:43 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0014.hostedemail.com [216.40.44.14]) by kanga.kvack.org (Postfix) with ESMTP id E800E6B0072 for ; Mon, 31 Oct 2022 18:10:42 -0400 (EDT) Received: from smtpin28.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay07.hostedemail.com (Postfix) with ESMTP id 98E87160301 for ; Mon, 31 Oct 2022 22:10:42 +0000 (UTC) X-FDA: 80082639924.28.FFCAA66 Received: from mx0a-00082601.pphosted.com (mx0a-00082601.pphosted.com [67.231.145.42]) by imf09.hostedemail.com (Postfix) with ESMTP id 1B75D140014 for ; Mon, 31 Oct 2022 22:10:41 +0000 (UTC) Received: from pps.filterd (m0044012.ppops.net [127.0.0.1]) by mx0a-00082601.pphosted.com (8.17.1.5/8.17.1.5) with ESMTP id 29VLskM3009789 for ; Mon, 31 Oct 2022 15:10:41 -0700 Received: from maileast.thefacebook.com ([163.114.130.16]) by mx0a-00082601.pphosted.com (PPS) with ESMTPS id 3kjn3f8x9x-7 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128 verify=NOT) for ; Mon, 31 Oct 2022 15:10:40 -0700 Received: from twshared16963.27.frc3.facebook.com (2620:10d:c0a8:1b::d) by mail.thefacebook.com (2620:10d:c0a8:83::5) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.31; Mon, 31 Oct 2022 15:10:39 -0700 Received: by devbig932.frc1.facebook.com (Postfix, from userid 4523) id B14E5F0C8871; Mon, 31 Oct 2022 14:58:39 -0700 (PDT) From: Song Liu To: , CC: , , , , , , , , , Song Liu Subject: [PATCH bpf-next v1 2/5] x86/alternative: support vmalloc_exec() and vfree_exec() Date: Mon, 31 Oct 2022 14:58:31 -0700 Message-ID: <20221031215834.1615596-3-song@kernel.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20221031215834.1615596-1-song@kernel.org> References: <20221031215834.1615596-1-song@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-FB-Internal: Safe Content-Type: text/plain X-Proofpoint-ORIG-GUID: oE-9Z1ouLG5ZkKUzgRlpSjJCx2XmUuH8 X-Proofpoint-GUID: oE-9Z1ouLG5ZkKUzgRlpSjJCx2XmUuH8 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.895,Hydra:6.0.545,FMLib:17.11.122.1 definitions=2022-10-31_21,2022-10-31_01,2022-06-22_01 ARC-Authentication-Results: i=1; imf09.hostedemail.com; dkim=none; spf=pass (imf09.hostedemail.com: domain of "prvs=2303bf8861=songliubraving@meta.com" designates 67.231.145.42 as permitted sender) smtp.mailfrom="prvs=2303bf8861=songliubraving@meta.com"; dmarc=fail reason="SPF not aligned (relaxed), No valid DKIM" header.from=kernel.org (policy=none) ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1667254242; a=rsa-sha256; cv=none; b=A7rNvl4aUdTjUJ8R6XduaaVLhf6zEALdvvnTijxrPA5oo+xoKpaToDzT7V+CxxNxdsuAgP 5sj71ujYOtzoo6WZ231SdU3jlMvkKvlfn83czrFjn6SY+eQ4c16vV+rEKZOVwrjQKCVjaG 5j5REUZ8Y3iKpITahb0b+9o8qBSY6uk= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1667254242; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=qJBuqZwUYjAdic8Fx/39Kej9QvrkoIoDUXShDgKr244=; b=JzixJM38A9nvj1SRxCHhUzHSOfkm2jtDDyVqVPvxTbny8x/FYDPDVeJqdHRKTDz6FD7gah uy/5a3wpFlBbWX+12xpIeVeR/wtTSux8sTHf+vS+HlcljnK9/mgvbo/J6pybBC/Dqf4lza Zb5jRDZECZkUEChnrtkNFgDBo5K7Chg= X-Rspam-User: X-Rspamd-Queue-Id: 1B75D140014 Authentication-Results: imf09.hostedemail.com; dkim=none; spf=pass (imf09.hostedemail.com: domain of "prvs=2303bf8861=songliubraving@meta.com" designates 67.231.145.42 as permitted sender) smtp.mailfrom="prvs=2303bf8861=songliubraving@meta.com"; dmarc=fail reason="SPF not aligned (relaxed), No valid DKIM" header.from=kernel.org (policy=none) X-Stat-Signature: z4fqhfrcecncc6jtk1sn3nr8kahqitc6 X-Rspamd-Server: rspam10 X-HE-Tag: 1667254241-879684 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: Implement arch_vcopy_exec() and arch_invalidate_exec() to support vmalloc_exec. arch_vcopy_exec() copies dynamic kernel text (such as BPF programs) to RO+X memory region allocated by vmalloc_exec(). arch_invalidate_exec() fills memory with 0xcc after it is released by vfree_exec(). Signed-off-by: Song Liu --- arch/x86/kernel/alternative.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/arch/x86/kernel/alternative.c b/arch/x86/kernel/alternative.= c index 5cadcea035e0..73d89774ace3 100644 --- a/arch/x86/kernel/alternative.c +++ b/arch/x86/kernel/alternative.c @@ -1270,6 +1270,18 @@ void *text_poke_copy(void *addr, const void *opcod= e, size_t len) return addr; } =20 +void *arch_vcopy_exec(void *dst, void *src, size_t len) +{ + if (text_poke_copy(dst, src, len) =3D=3D NULL) + return ERR_PTR(-EINVAL); + return dst; +} + +int arch_invalidate_exec(void *ptr, size_t len) +{ + return IS_ERR_OR_NULL(text_poke_set(ptr, 0xcc, len)); +} + /** * text_poke_set - memset into (an unused part of) RX memory * @addr: address to modify --=20 2.30.2