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=-6.0 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_PASS,USER_AGENT_GIT 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 BBE69C10F0E for ; Mon, 15 Apr 2019 09:50:00 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (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 831572070D for ; Mon, 15 Apr 2019 09:50:00 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="gfftnaso" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 831572070D Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=arm.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:Message-Id:Date:Subject:To :From:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:In-Reply-To:References: List-Owner; bh=oFMvL40VXRiLTN4/j1luQOozhUy+ZI3Y/y2v+RXh2GQ=; b=gfftnasokd2XZu B0Y9GtZ+ONE1XsZhph78JyTwL4943GRp+dt9+CWpVv3PMAyt/2NKf/tf2WQuPKnB9JxFf3xIZ5ntX RtzXtjR7waMV53bKVnQ7DKzhrmVdk6KDlew6alElkaEwiPVzVjFfh1UYtnIsykSVinvkmVaQEwHp5 i40mvKqzIYlxyNflva5udKf5rJECpYEbA2g8WlPynRnfu2ApQArI9gbCT8jZMbbaOcZXPklxlNuuc Uu1zfRr72Y+2TlWE/xBw3h0espiKKMsH88sl2O5Beg2ZBK8RmvBST4QR+HCp29IJzrR33o6Cx2ukD 3vpSss+qVc4AOogF+iVA==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.90_1 #2 (Red Hat Linux)) id 1hFyFP-00032V-3c; Mon, 15 Apr 2019 09:49:55 +0000 Received: from foss.arm.com ([217.140.101.70]) by bombadil.infradead.org with esmtp (Exim 4.90_1 #2 (Red Hat Linux)) id 1hFyFM-00031E-A7 for linux-arm-kernel@lists.infradead.org; Mon, 15 Apr 2019 09:49:53 +0000 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.72.51.249]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 994B580D; Mon, 15 Apr 2019 02:49:49 -0700 (PDT) Received: from e119884-lin.cambridge.arm.com (e119884-lin.cambridge.arm.com [10.1.196.72]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id ABEBB3F557; Mon, 15 Apr 2019 02:49:48 -0700 (PDT) From: Vincenzo Frascino To: linux-arm-kernel@lists.infradead.org Subject: [PATCH v4 0/4] arm64: compat: Add kuser helpers config option Date: Mon, 15 Apr 2019 10:49:33 +0100 Message-Id: <20190415094937.13518-1-vincenzo.frascino@arm.com> X-Mailer: git-send-email 2.21.0 MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190415_024952_357255_4099DC2A X-CRM114-Status: GOOD ( 11.54 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Mark Rutland , Catalin Marinas , Will Deacon Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org Currently on arm64 compat kuser helper are enabled by default. To be on pair with arm32, this patchset makes it possible to disable the kuser helpers by adding a CONFIG_KUSER_HELPERS option which is enabled by default to avoid compatibility issues. When the config option is disabled: - The kuser helpers-related code is not compiled with the kernel. - The kuser helpers mapping, for any compat process, at 0xffff0000 is not done. - Any attempt to use a kuser helper from a compat process will result in a segfault. Changes: -------- v4: - Rebased on 5.1-rc5. - Addressed review comments. v3: - Fix aarch32_alloc_vdso_pages() v2: - Rebased on 5.1-rc3. - Addressed review comments. Cc: Catalin Marinas Cc: Will Deacon Cc: Mark Rutland Signed-off-by: Vincenzo Frascino Vincenzo Frascino (4): arm64: compat: Alloc separate pages for vectors and sigpage arm64: compat: Split kuser32 arm64: compat: Refactor aarch32_alloc_vdso_pages() arm64: compat: Add KUSER_HELPERS config option arch/arm64/Kconfig | 28 +++++ arch/arm64/include/asm/elf.h | 6 +- arch/arm64/include/asm/signal32.h | 2 - arch/arm64/kernel/Makefile | 5 +- arch/arm64/kernel/kuser32.S | 66 ++---------- arch/arm64/kernel/signal32.c | 5 +- arch/arm64/kernel/sigreturn32.S | 46 ++++++++ arch/arm64/kernel/vdso.c | 173 ++++++++++++++++++++++++------ 8 files changed, 231 insertions(+), 100 deletions(-) create mode 100644 arch/arm64/kernel/sigreturn32.S -- 2.21.0 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel