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Received: from mail.kernel.org ([198.145.29.99]) by merlin.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1jJH0m-0002E1-Hm for linux-riscv@lists.infradead.org; Tue, 31 Mar 2020 13:33:01 +0000 Received: from devnote2 (NE2965lan1.rev.em-net.ne.jp [210.141.244.193]) (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 47A652071A; Tue, 31 Mar 2020 13:32:57 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1585661578; bh=xjsNuevst2hdoei+2YBbw5AgZ2uz8egnJHzxF30a8nE=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=AKHoXwoa7Zff+4XX9H7YktH1P5TqfcvSPOjj3q5b12fvv7S5USQRJJavhLGvPoq1r v2jq3btdOo7/KW9kO57RD6C7jxevyGTT5TsbRizoP7pFIC44Pi0ZZUz11qzo34gefh WUZq/LzvwaNl+ty9qjxc3W99SMtO0ucdw+uQt5KQ= Date: Tue, 31 Mar 2020 22:32:54 +0900 From: Masami Hiramatsu To: Zong Li Subject: Re: [PATCH v3 0/9] Support strict kernel memory permissions for security Message-Id: <20200331223254.919b92750962fefed5a6646f@kernel.org> In-Reply-To: References: X-Mailer: Sylpheed 3.5.1 (GTK+ 2.24.32; x86_64-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-BeenThere: linux-riscv@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-riscv@lists.infradead.org, aou@eecs.berkeley.edu, palmer@dabbelt.com, linux-kernel@vger.kernel.org, paul.walmsley@sifive.com Sender: "linux-riscv" Errors-To: linux-riscv-bounces+infradead-linux-riscv=archiver.kernel.org@lists.infradead.org Hi Zong, On Tue, 10 Mar 2020 00:55:35 +0800 Zong Li wrote: > The main purpose of this patch series is changing the kernel mapping permission > , make sure that code is not writeable, data is not executable, and read-only > data is neither writable nor executable. > > This patch series also supports the relevant implementations such as > ARCH_HAS_SET_MEMORY, ARCH_HAS_SET_DIRECT_MAP, > ARCH_SUPPORTS_DEBUG_PAGEALLOC and DEBUG_WX. The order of the patches seems a bit strange. Since the first 7 patches makes kernel read-only, at that point ftrace is broken and it is fixed by the last 2 patches. That is not bisect-friendly. Can you move the last 2 patches to the top? Thank you, > > Changes in v3: > - Fix build error on nommu configuration. We already support nommu on > RISC-V, so we should consider nommu case and test not only rv32/64, > but also nommu. > > Changes in v2: > - Use _data to specify the start of data section with write permission. > - Change ftrace patch text implementaion. > - Separate DEBUG_WX patch to another patchset. > > Zong Li (9): > riscv: add ARCH_HAS_SET_MEMORY support > riscv: add ARCH_HAS_SET_DIRECT_MAP support > riscv: add ARCH_SUPPORTS_DEBUG_PAGEALLOC support > riscv: move exception table immediately after RO_DATA > riscv: add alignment for text, rodata and data sections > riscv: add STRICT_KERNEL_RWX support > riscv: add macro to get instruction length > riscv: introduce interfaces to patch kernel code > riscv: patch code by fixmap mapping > > arch/riscv/Kconfig | 6 + > arch/riscv/include/asm/bug.h | 8 ++ > arch/riscv/include/asm/fixmap.h | 2 + > arch/riscv/include/asm/patch.h | 12 ++ > arch/riscv/include/asm/set_memory.h | 48 +++++++ > arch/riscv/kernel/Makefile | 4 +- > arch/riscv/kernel/ftrace.c | 13 +- > arch/riscv/kernel/patch.c | 120 ++++++++++++++++++ > arch/riscv/kernel/traps.c | 3 +- > arch/riscv/kernel/vmlinux.lds.S | 11 +- > arch/riscv/mm/Makefile | 2 +- > arch/riscv/mm/init.c | 44 +++++++ > arch/riscv/mm/pageattr.c | 187 ++++++++++++++++++++++++++++ > 13 files changed, 445 insertions(+), 15 deletions(-) > create mode 100644 arch/riscv/include/asm/patch.h > create mode 100644 arch/riscv/include/asm/set_memory.h > create mode 100644 arch/riscv/kernel/patch.c > create mode 100644 arch/riscv/mm/pageattr.c > > -- > 2.25.1 > -- Masami Hiramatsu