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=-9.2 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,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 C9E1EC43381 for ; Sat, 23 Feb 2019 21:10:35 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 964B92085A for ; Sat, 23 Feb 2019 21:10:35 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1550956235; bh=8sD8ZRdp+3fjPhCdUs3BkfJctbstd/TqrN9AHgTd+5Q=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=oXh15S9mz7yQW7xlQ10mTFngXHXyQrNKUSyclj4jQoGT9Qvemxx/VFBiq0REnc4Fa DQyngkHocPLFFmsNbo2vAIsLGhS9dKxc16hUwY3dnPis28rD6uP3bl8KPCR7UdiRiX 8NWkpKxIzyNyhidZg/bc/+46L9MYZiyus00QnFZM= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729783AbfBWVKe (ORCPT ); Sat, 23 Feb 2019 16:10:34 -0500 Received: from mail.kernel.org ([198.145.29.99]:46600 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728564AbfBWVKa (ORCPT ); Sat, 23 Feb 2019 16:10:30 -0500 Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 6D78020855; Sat, 23 Feb 2019 21:10:29 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1550956230; bh=8sD8ZRdp+3fjPhCdUs3BkfJctbstd/TqrN9AHgTd+5Q=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=MjN0yQU293ARhJfiIFso0Z1gb1wTC2/1OO62F95WoiD08rjNOwjVraTNvUpf0GDDo OA43KucY1zOxP0RLiEMLMiHZEKn7b7wrZJW/MokLGwd45Dlu3G3axNENIivy+HzGFU 4unY0h6Ed4Hh+EETswZp1lnmvJLS0l7OUX2EkRgk= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: James Morse , Will Deacon , Sasha Levin Subject: [PATCH AUTOSEL 4.9 25/32] arm64: kprobe: Always blacklist the KVM world-switch code Date: Sat, 23 Feb 2019 16:09:44 -0500 Message-Id: <20190223210951.202268-25-sashal@kernel.org> X-Mailer: git-send-email 2.19.1 In-Reply-To: <20190223210951.202268-1-sashal@kernel.org> References: <20190223210951.202268-1-sashal@kernel.org> MIME-Version: 1.0 X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: James Morse [ Upstream commit f2b3d8566d81deaca31f4e3163def0bea7746e11 ] On systems with VHE the kernel and KVM's world-switch code run at the same exception level. Code that is only used on a VHE system does not need to be annotated as __hyp_text as it can reside anywhere in the kernel text. __hyp_text was also used to prevent kprobes from patching breakpoint instructions into this region, as this code runs at a different exception level. While this is no longer true with VHE, KVM still switches VBAR_EL1, meaning a kprobe's breakpoint executed in the world-switch code will cause a hyp-panic. Move the __hyp_text check in the kprobes blacklist so it applies on VHE systems too, to cover the common code and guest enter/exit assembly. Fixes: 888b3c8720e0 ("arm64: Treat all entry code as non-kprobe-able") Reviewed-by: Christoffer Dall Signed-off-by: James Morse Acked-by: Masami Hiramatsu Signed-off-by: Will Deacon Signed-off-by: Sasha Levin --- arch/arm64/kernel/probes/kprobes.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/arch/arm64/kernel/probes/kprobes.c b/arch/arm64/kernel/probes/kprobes.c index 30bcae0aef2a0..d2b1b624ddc3c 100644 --- a/arch/arm64/kernel/probes/kprobes.c +++ b/arch/arm64/kernel/probes/kprobes.c @@ -546,13 +546,13 @@ bool arch_within_kprobe_blacklist(unsigned long addr) addr < (unsigned long)__entry_text_end) || (addr >= (unsigned long)__idmap_text_start && addr < (unsigned long)__idmap_text_end) || + (addr >= (unsigned long)__hyp_text_start && + addr < (unsigned long)__hyp_text_end) || !!search_exception_tables(addr)) return true; if (!is_kernel_in_hyp_mode()) { - if ((addr >= (unsigned long)__hyp_text_start && - addr < (unsigned long)__hyp_text_end) || - (addr >= (unsigned long)__hyp_idmap_text_start && + if ((addr >= (unsigned long)__hyp_idmap_text_start && addr < (unsigned long)__hyp_idmap_text_end)) return true; } -- 2.19.1