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=-4.0 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT 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 EB1E3C76195 for ; Mon, 22 Jul 2019 07:48:34 +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 C71392199C for ; Mon, 22 Jul 2019 07:48:34 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="L80UFg8H"; dkim=fail reason="signature verification failed" (1024-bit key) header.d=kernel.org header.i=@kernel.org header.b="F8zFyZIr" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org C71392199C Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org 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=XraNed675hnoKorqj2JjkGCGOT7YHdqGuCNSYEpVt/U=; b=L80UFg8H/ndqdI 9+kJI+lxjzJSMpVPYgSS6wjNHsq269wD+ESM0oolGctFbCn/S5aToOXe6N4H8dXnPRdNdLNs9ynTp 9UTLQS8Q/6gK8HIO3eAvCze8WYiAXm+hloOgtjirgmYztoZmgruTYHyh5a43tQyJEmNLjvOPtRgMR tdfNi+r3c6XLljILudS3pwmWq0eCM3sDyozWMxyATs610+S/hIeImO6Hn+S0BhvT7eiOKpLMHr48a EweUXr4Gbbuf5D7bGSm/7/jrhluXAO8VWZCnmmgQ5XFi+mS8o8qGQ8UHoqyKRS2bOTHEl4h2BqUvz FqjPTQiW2MMee9l2m2Dg==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92 #3 (Red Hat Linux)) id 1hpT3g-0008Vt-P4; Mon, 22 Jul 2019 07:48:32 +0000 Received: from mail.kernel.org ([198.145.29.99]) by bombadil.infradead.org with esmtps (Exim 4.92 #3 (Red Hat Linux)) id 1hpT3e-0008VT-IL for linux-arm-kernel@lists.infradead.org; Mon, 22 Jul 2019 07:48:31 +0000 Received: from localhost.localdomain (NE2965lan1.rev.em-net.ne.jp [210.141.244.193]) (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 B96182199C; Mon, 22 Jul 2019 07:48:27 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1563781710; bh=fCm+twhupd0sfoMKl3+oPJY6FX4/EFcymfZefTFmLO8=; h=From:To:Cc:Subject:Date:From; b=F8zFyZIrS/zpZQrHnC9mXaN0J0K7HeaiyybgnJ9mwyxw3fFiCElwLVA8qUy2OEfe+ OzJ+k34UT+jduVM2DYe4wVtgUGWd03QtNcjydt4XV7KxaZFh3kF2LOK6k2XcgI7cRj 37ibeZlJlREutUvtOi0ttksrQWxTXenUeUZysu+4= From: Masami Hiramatsu To: Catalin Marinas , Will Deacon Subject: [PATCH v2 0/4] arm64: kprobes: Fix some bugs in arm64 kprobes Date: Mon, 22 Jul 2019 16:48:24 +0900 Message-Id: <156378170297.12011.17385386326930403235.stgit@devnote2> X-Mailer: git-send-email 2.20.1 User-Agent: StGit/0.17.1-dirty MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190722_004830_629839_DA8912FE X-CRM114-Status: GOOD ( 10.35 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Dan Rue , Daniel Diaz , Anders Roxell , Naresh Kamboju , linux-kernel@vger.kernel.org, Matt Hart , linux-arm-kernel@lists.infradead.org, mhiramat@kernel.org 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 Hi, Here are the v2 patches which fixes kprobe bugs on arm64. Naresh reported that recently ftracetest crashes kernel, and I found there are 3 different bugs around the crash. In v1 thread, we found one another bug of RCU and debug exception. - Kprobes on arm64 doesn't recover pstate.D mask after single stepping. This causes a real kernel crash if a kprobe is unexpectedly nested. - Some symbols which are called from blacklisted function, are not blacklisted. - Debug exception is not visible to RCU, thus rcu_read_lock() cause a warning inside it. - Debug exception handlers on arm64 is using rcu_read_lock(), but that is not needed because interrupts are disabled. This series includes fixes for above bugs. Thank you, --- Masami Hiramatsu (4): arm64: kprobes: Recover pstate.D in single-step exception handler arm64: unwind: Prohibit probing on return_address() arm64: Make debug exception handlers visible from RCU arm64: Remove unneeded rcu_read_lock from debug handlers arch/arm64/kernel/debug-monitors.c | 14 +++++++----- arch/arm64/kernel/probes/kprobes.c | 41 ++++++------------------------------ arch/arm64/kernel/return_address.c | 4 +++- arch/arm64/kernel/stacktrace.c | 3 +++ arch/arm64/mm/fault.c | 40 +++++++++++++++++++++++++++++++++++ 5 files changed, 61 insertions(+), 41 deletions(-) -- Masami Hiramatsu (Linaro) _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel