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 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 smtp.lore.kernel.org (Postfix) with ESMTPS id 908EDCA5FFC for ; Wed, 7 Oct 2026 15:39:24 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:Message-ID: In-Reply-To:Subject:cc:To:From:Date:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=PueWRpY4tb5brLBTY5Wcc71h8FqVvMvmkNM09R8c/sQ=; b=KWneDC92/g1Agt UvRjTUZRLdo0ro0MCs/XuEbImj80gj+sbsUwOqQmlNRwjgHIFcHFzxM6cf6bceBn86t2Qs6oZRKOo urFYMhK04DIF6eX0d8GYDv2bF8beOMDtsAWw+Wq9RULOClAIlQ4SCmMixKwSXWY4OfKdZIH031yS+ vN4Gr5JyCuqWV3+UVDC/KuGj3W973lN8NDUZsAYvNQ6ZNi3nqIcd8O4AARXg73MRtysIYw1MtpfX2 3+IejiIjbUSt6Tx9jrm3B+wBfdl5RZR5u4tpd9yAP5DFVnlDEeA4BbJNgWHafV1poNc0ZkO65cq63 K/a1BMiD+e3+v6TpZ2xw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1xETjZ-00000002ije-3FD7; Wed, 07 Oct 2026 15:39:09 +0000 Received: from tor.source.kernel.org ([172.105.4.254]) by bombadil.infradead.org with esmtps (Exim 4.99.1 #2 (Red Hat Linux)) id 1xETjY-00000002ijR-1Owa for linux-riscv@lists.infradead.org; Wed, 07 Oct 2026 15:39:08 +0000 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) by tor.source.kernel.org (Postfix) with ESMTP id 82DED60202; Wed, 7 Oct 2026 15:39:07 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 625CF1F000FF; Wed, 7 Oct 2026 15:39:05 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1791387547; bh=p346DBewhLxeZdx36JJxUf8JaJdqjbbB8zICG+z4Gag=; h=Date:From:To:cc:Subject:In-Reply-To:References; b=S171WsZruMhmWqVUT1wEsBGoQpcCiOreN97b5RnO44HrFGwuJt4tgcLEPCjvdWpyF P6w29UIbMaRvnLv71WcHBrQizbGaspuHyDyvGO0a6ysTKA1lU4SnaV5GdcA9u7lTyK c1VqW/jSGg5ZU7mUwMRs+dnJjTKlKZUzHs64+3/OLGDgkFB/RQSFozUX9nK+lAIe17 +CRoj7/bGyw3DLnyiNx9xVKGOq2wGBrRiDlo6YPNSxz9KLqT7ekvQl1szSkeosregV 6+ULo0OUxxvSbokkGjG2ww/ooA1gvFgAsfn06tUbThUEQIoAXyBeXH4/EzF5KLVogp PYylQg+sbjZFA== Date: Wed, 7 Oct 2026 09:39:03 -0600 (MDT) From: Paul Walmsley To: Chen Pei cc: pjw@kernel.org, oleg@redhat.com, debug@rivosinc.com, alex@ghiti.fr, guoren@kernel.org, linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH] riscv: ptrace: reject CFI regset access when extensions are absent In-Reply-To: <20260820063233.2567-1-cp0613@linux.alibaba.com> Message-ID: <8a340efc-d50f-40b1-698e-65bde2cc0660@kernel.org> References: <20260820063233.2567-1-cp0613@linux.alibaba.com> MIME-Version: 1.0 X-BeenThere: linux-riscv@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-riscv" Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org On Thu, 20 Aug 2026, Chen Pei wrote: > riscv_cfi_get() and riscv_cfi_set() do not check whether the Zicfilp > or Zicfiss extensions are present. On systems without them, > PTRACE_GETREGSET on REGSET_CFI still succeeds and returns a zeroed > user_cfi_state, misleading debuggers into believing the register set > is available, and PTRACE_SETREGSET silently accepts writes that have > no effect (e.g. clearing SR_ELP). > > Reject the access with -EINVAL when neither branch landing pads nor > shadow stack is available to userspace, using the same availability > helpers as the prctl path. > > Fixes: 2af7c9cf021c ("riscv/ptrace: expose riscv CFI status and state via ptrace and in core files") > Signed-off-by: Chen Pei Thanks, queued for v7.3-rc. - Paul _______________________________________________ linux-riscv mailing list linux-riscv@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-riscv