From patchwork Mon Apr 4 09:44:23 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mark Brown X-Patchwork-Id: 52612 Return-Path: X-Original-To: patchwork@sourceware.org Delivered-To: patchwork@sourceware.org Received: from server2.sourceware.org (localhost [IPv6:::1]) by sourceware.org (Postfix) with ESMTP id 2CF103858016 for ; Mon, 4 Apr 2022 09:44:56 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 2CF103858016 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=sourceware.org; s=default; t=1649065496; bh=i8FG8AM7fvfh51xWVUM5RfuzUgCkA9A8xOW+8Okje0g=; h=To:Subject:Date:List-Id:List-Unsubscribe:List-Archive:List-Post: List-Help:List-Subscribe:From:Reply-To:Cc:From; b=kPWLfHgi7FS8DFibU5gX0+XdPHqMNWTjX1fxy5hFtsSn6O7dRhClPFT5yrM7clF5p ogtGXeHtNNF0HfclD/CldBTD8bc+rOzxUz2m8Vnu/ZAHmCvucrXL1aR2G3rktboZ7Y sOdAc5pIpdkxvCamvcmfujz2xJR833HMjAWcUl50= X-Original-To: libc-alpha@sourceware.org Delivered-To: libc-alpha@sourceware.org Received: from ams.source.kernel.org (ams.source.kernel.org [IPv6:2604:1380:4601:e00::1]) by sourceware.org (Postfix) with ESMTPS id 9E28B3858D1E for ; Mon, 4 Apr 2022 09:44:33 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.1 sourceware.org 9E28B3858D1E Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id 91419B8094B; Mon, 4 Apr 2022 09:44:32 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id E3404C340F3; Mon, 4 Apr 2022 09:44:28 +0000 (UTC) To: Catalin Marinas , Will Deacon Subject: [PATCH v12 0/2] arm64: Enable BTI for the executable as well as the interpreter Date: Mon, 4 Apr 2022 10:44:23 +0100 Message-Id: <20220404094425.313821-1-broonie@kernel.org> X-Mailer: git-send-email 2.30.2 MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=2077; h=from:subject; bh=Bz8u+N/aNiqP+D7rbHSQ+B3ZQlGFH3cswzDIh9U3NLg=; b=owEBbQGS/pANAwAKASTWi3JdVIfQAcsmYgBiSr32Vv3lA0HVPUUqKQDPPx7vJyNXcHWB0mkHG2wA XBGnZFmJATMEAAEKAB0WIQSt5miqZ1cYtZ/in+ok1otyXVSH0AUCYkq99gAKCRAk1otyXVSH0IxqB/ 9OkyhiEqzFkNPcQgv4G0keSQNFepg0Uu+/GZ26uHJCGgvNjrFqHwNuMCYmEWFRiaydppkZBNC1ojD8 qR5BI7phmFadGXM3U6X+2d5OcEtbPgjV39vz5Lxc5cZSz7uHxksZmPqUEmW+RGTf38DAEOfgNh6uWn yAuaaoCxfqDR80aCRY8wHqSm4JVTuaiVURnx+E1TBxndtMg2XyVpb17do/goQOgHf27V9or2F8gUEG gS/fzmgnkfKvkeAYClqrG5k4hMSB+cKpG+Hbc3VbNXeoYuUaHuqJ/SzfyFE7VaR595byRn/w1nZ4e6 98HH22OpfcjM+X/yp0CH9gYPX3StZn X-Developer-Key: i=broonie@kernel.org; a=openpgp; fpr=3F2568AAC26998F9E813A1C5C3F436CA30F5D8EB X-Spam-Status: No, score=-5.0 required=5.0 tests=BAYES_00, DKIMWL_WL_HIGH, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, SPF_HELO_NONE, SPF_PASS, TXREP, T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.4 X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on server2.sourceware.org X-BeenThere: libc-alpha@sourceware.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Libc-alpha mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-Patchwork-Original-From: Mark Brown via Libc-alpha From: Mark Brown Reply-To: Mark Brown Cc: linux-arch@vger.kernel.org, Yu-cheng Yu , libc-alpha@sourceware.org, Kees Cook , Szabolcs Nagy , Jeremy Linton , Mark Brown , linux-arm-kernel@lists.infradead.org Errors-To: libc-alpha-bounces+patchwork=sourceware.org@sourceware.org Sender: "Libc-alpha" Deployments of BTI on arm64 have run into issues interacting with systemd's MemoryDenyWriteExecute feature. Currently for dynamically linked executables the kernel will only handle architecture specific properties like BTI for the interpreter, the expectation is that the interpreter will then handle any properties on the main executable. For BTI this means remapping the executable segments PROT_EXEC | PROT_BTI. This interacts poorly with MemoryDenyWriteExecute since that is implemented using a seccomp filter which prevents setting PROT_EXEC on already mapped memory and lacks the context to be able to detect that memory is already mapped with PROT_EXEC. This series resolves this by providing a sysctl which when enabled will cause the kernel to handle the BTI property for both the interpreter and the main executable. v12: - Rebase onto v5.18-rc1. v11: - Ignore extra PT_INTERPs. v10: - Add a sysctl abi.bti_main controlling the new behaviour. v9: - Rebase onto v5.17-rc3. v8: - Rebase onto v5.17-rc1. v7: - Rebase onto v5.16-rc1. v6: - Rebase onto v5.15-rc1. v5: - Rebase onto v5.14-rc2. - Tweak changelog on patch 1. - Use the helper for interpreter/executable flag in elf.h as well. v4: - Rebase onto v5.14-rc1. v3: - Fix passing of properties for parsing by the main executable. - Drop has_interp from arch_parse_elf_property(). - Coding style tweaks. v2: - Add a patch dropping has_interp from arch_adjust_elf_prot() - Fix bisection issue with static executables on arm64 in the first patch. Mark Brown (2): elf: Allow architectures to parse properties on the main executable arm64: Enable BTI for main executable as well as the interpreter arch/arm64/include/asm/elf.h | 14 ++++++++-- arch/arm64/kernel/process.c | 52 +++++++++++++++++++++++++++--------- fs/binfmt_elf.c | 34 ++++++++++++++++------- include/linux/elf.h | 4 ++- 4 files changed, 78 insertions(+), 26 deletions(-) base-commit: 3123109284176b1532874591f7c81f3837bbdc17