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 304F6C43381 for ; Mon, 25 Feb 2019 21:19:59 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id F1F3B21841 for ; Mon, 25 Feb 2019 21:19:58 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1551129599; bh=YUA0NAqmVtkBKSYlkXPjO0Lb2GyBoJPbuDomsv30lj8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=iugZe0ymChv49UbsAa9yLQDF5JjMAD22ar3QvtGXub6xz3qmfIuayVObMxXb/nfoA UyL+pR3iWYMm3MCaVApzkFm8nTJaHlZDR1d7O7hEIKewH4KqFmYDKahFBJJOD4bKnn t3yVFOQwiv8cy/+6+ZzumHHvejaQq643btz28/FM= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730390AbfBYVT4 (ORCPT ); Mon, 25 Feb 2019 16:19:56 -0500 Received: from mail.kernel.org ([198.145.29.99]:53134 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727031AbfBYVTx (ORCPT ); Mon, 25 Feb 2019 16:19:53 -0500 Received: from localhost (5356596B.cm-6-7b.dynamic.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 C885B2183F; Mon, 25 Feb 2019 21:19:51 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1551129592; bh=YUA0NAqmVtkBKSYlkXPjO0Lb2GyBoJPbuDomsv30lj8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=D79b95lwrdHXRR/ro8D7xj4z/FVvokLVTMY2nbmok636Zkev14kVWVrhuqcw4GSpI zb4820AILDFSsFKGCIE5kH/8jkvadP3E2F3CI/42y3xP+oJK8sNpss2CtVDPkp82Ho Z7w066b9L4dLZoGYtF1vdkW7BBR5XMMGW/i3Za7I= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Mathieu Desnoyers , Robert Berger , Kees Cook , Masami Hiramatsu , William Cohen , Laura Abbott , linux-arm-kernel@lists.infradead.org, patches@armlinux.org.uk, Russell King Subject: [PATCH 4.19 001/152] ARM: 8834/1: Fix: kprobes: optimized kprobes illegal instruction Date: Mon, 25 Feb 2019 22:09:53 +0100 Message-Id: <20190225195043.761067800@linuxfoundation.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190225195043.645958524@linuxfoundation.org> References: <20190225195043.645958524@linuxfoundation.org> User-Agent: quilt/0.65 X-stable: review X-Patchwork-Hint: ignore MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 4.19-stable review patch. If anyone has any objections, please let me know. ------------------ From: Mathieu Desnoyers commit 0ac569bf6a7983c0c5747d6df8db9dc05bc92b6c upstream. commit e46daee53bb5 ("ARM: 8806/1: kprobes: Fix false positive with FORTIFY_SOURCE") introduced a regression in optimized kprobes. It triggers "invalid instruction" oopses when using kprobes instrumentation through lttng and perf. This commit was introduced in kernel v4.20, and has been backported to stable kernels 4.19 and 4.14. This crash was also reported by Hongzhi Song on the redhat bugzilla where the patch was originally introduced. Link: https://bugzilla.redhat.com/show_bug.cgi?id=1639397 Link: https://bugs.lttng.org/issues/1174 Link: https://lore.kernel.org/lkml/342740659.2887.1549307721609.JavaMail.zimbra@efficios.com Fixes: e46daee53bb5 ("ARM: 8806/1: kprobes: Fix false positive with FORTIFY_SOURCE") Signed-off-by: Mathieu Desnoyers Reported-by: Robert Berger Tested-by: Robert Berger Acked-by: Kees Cook Cc: Robert Berger Cc: Masami Hiramatsu Cc: William Cohen Cc: Laura Abbott Cc: Kees Cook Cc: # v4.14+ Cc: linux-arm-kernel@lists.infradead.org Cc: patches@armlinux.org.uk Signed-off-by: Russell King Signed-off-by: Greg Kroah-Hartman --- arch/arm/probes/kprobes/opt-arm.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/arch/arm/probes/kprobes/opt-arm.c +++ b/arch/arm/probes/kprobes/opt-arm.c @@ -247,7 +247,7 @@ int arch_prepare_optimized_kprobe(struct } /* Copy arch-dep-instance from template. */ - memcpy(code, (unsigned char *)optprobe_template_entry, + memcpy(code, (unsigned long *)&optprobe_template_entry, TMPL_END_IDX * sizeof(kprobe_opcode_t)); /* Adjust buffer according to instruction. */