From mboxrd@z Thu Jan 1 00:00:00 1970 Delivery-date: Fri, 13 Jun 2025 11:09:55 +0200 Received: from metis.whiteo.stw.pengutronix.de ([2a0a:edc0:2:b01:1d::104]) by lore.white.stw.pengutronix.de with esmtps (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.96) (envelope-from ) id 1uQ0Q7-006oTd-0C for lore@lore.pengutronix.de; Fri, 13 Jun 2025 11:09:55 +0200 Received: from bombadil.infradead.org ([2607:7c80:54:3::133]) by metis.whiteo.stw.pengutronix.de with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1uQ0Q6-0004qL-GW for lore@pengutronix.de; Fri, 13 Jun 2025 11:09:55 +0200 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:To:Content-Transfer-Encoding :Content-Type:MIME-Version:Message-Id:Date:Subject:From:Reply-To:Cc: Content-ID:Content-Description:Resent-Date:Resent-From:Resent-Sender: Resent-To:Resent-Cc:Resent-Message-ID:In-Reply-To:References:List-Owner; bh=VTraycUH8QSPX8hneDstpjq8wLUnyYi4C9+2l5kLuv0=; b=Duhi0pz5trLexifyXrlzPRMncT n55OuThjtp5WZ7Z63PN9ZivzwRZhqCQ2T3XHrMvvQNCBHyvlnHtoHC0hfRPJrWGIM7+xfuzp7/fYm suL9MoHwQUiaYddNAyjk8Z5SDhjdmbr6FVa9OmxIA9eQqZ/+ouXNbKSr2Wdpe/UM2Um4JyiZi+59K 7rgHJ9MRgKTXZtAwOAWRHdNioNZzz7GZS+vM87ftARWIiW/lMGJ+Q0k8OURCsXnDwOIvc285C5hrz thGZoYPy7Yribjnmiw3IAZaVBMJopOCuOaxEI89QAm/T97oY0BLsNvh//AzO3rct7ibg3hfJVzu6F QFyEht1g==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1uQ0Pn-0000000Fs7W-3VhI; Fri, 13 Jun 2025 09:09:35 +0000 Received: from metis.whiteo.stw.pengutronix.de ([2a0a:edc0:2:b01:1d::104]) by bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1uPzJN-0000000FiDD-3LEh for barebox@lists.infradead.org; Fri, 13 Jun 2025 07:58:55 +0000 Received: from drehscheibe.grey.stw.pengutronix.de ([2a0a:edc0:0:c01:1d::a2]) by metis.whiteo.stw.pengutronix.de with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1uPzJL-0004cf-JH; Fri, 13 Jun 2025 09:58:51 +0200 Received: from dude02.red.stw.pengutronix.de ([2a0a:edc0:0:1101:1d::28]) by drehscheibe.grey.stw.pengutronix.de with esmtps (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.96) (envelope-from ) id 1uPzJL-003Fnv-0y; Fri, 13 Jun 2025 09:58:51 +0200 Received: from localhost ([::1] helo=dude02.red.stw.pengutronix.de) by dude02.red.stw.pengutronix.de with esmtp (Exim 4.96) (envelope-from ) id 1uPzJL-00CPUK-0g; Fri, 13 Jun 2025 09:58:51 +0200 From: Sascha Hauer Date: Fri, 13 Jun 2025 09:58:48 +0200 Message-Id: <20250613-arm-mmu-xn-ro-v1-0-60f05c6e7b4b@pengutronix.de> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit X-B4-Tracking: v=1; b=H4sIADnaS2gC/6tWKk4tykwtVrJSqFYqSi3LLM7MzwNyDHUUlJIzE vPSU3UzU4B8JSMDI1MDM0Nj3cSiXN3c3FLdijzdonxdw0TDFEtLMxNLs8RUJaCegqLUtMwKsHn RsbW1AITkF2ZfAAAA X-Change-ID: 20250613-arm-mmu-xn-ro-1a1d996496ae To: BAREBOX X-Mailer: b4 0.14.2 X-Developer-Signature: v=1; a=ed25519-sha256; t=1749801531; l=2021; i=s.hauer@pengutronix.de; s=20230412; h=from:subject:message-id; bh=Re3DnWSGU/GclBLzgZLrKC+qw9MS8z9WIW/bZGs8VmU=; b=xjXAgVXzxtIupdINmtcQE7R3oSR8tbf61Rlt8sSKcae6rflp0IAVimkQFttiAvDvi0m0ekkTU Fwa2sk0fOWsC17isSlXLBd7lLPqKgy64RA/2O+tb95jR2/wGYtrGFF9 X-Developer-Key: i=s.hauer@pengutronix.de; a=ed25519; pk=4kuc9ocmECiBJKWxYgqyhtZOHj5AWi7+d0n/UjhkwTg= X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250613_005853_842182_58B0AFAE X-CRM114-Status: GOOD ( 10.92 ) X-BeenThere: barebox@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "barebox" X-SA-Exim-Connect-IP: 2607:7c80:54:3::133 X-SA-Exim-Mail-From: barebox-bounces+lore=pengutronix.de@lists.infradead.org X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on metis.whiteo.stw.pengutronix.de X-Spam-Level: X-Spam-Status: No, score=-5.2 required=4.0 tests=AWL,BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,RCVD_IN_DNSWL_MED,SPF_HELO_NONE,SPF_NONE autolearn=unavailable autolearn_force=no version=3.4.2 Subject: [PATCH 0/7] ARM: Map sections RO/XN X-SA-Exim-Version: 4.2.1 (built Wed, 08 May 2019 21:11:16 +0000) X-SA-Exim-Scanned: Yes (on metis.whiteo.stw.pengutronix.de) So far we mapped all RAM as read write with execute permission. This series series hardens this a bit. The barebox text segment will be mapped readonly with execute permission, the RO data section as readonly without execute permission and the remaining RAM will lose its execute permission. I tested this series on ARMv7 and ARMv8. I am not confident though that there are no regressions, so this new behaviour is behind a Kconfig option. It is default-y, but can be disabled for debugging purposses. Once this series has proven stable it can be removed. I haven't tested it on ARMv4-v6 due to the lack of hardware. I tried on Qemu, but the write protection did not work as expected. This should be resolved before merging. Signed-off-by: Sascha Hauer --- Sascha Hauer (7): memory: request RO data section as separate region ARM: pass barebox base to mmu_early_enable() ARM: mmu: move ARCH_MAP_WRITECOMBINE to header ARM: MMU: map memory for barebox proper pagewise ARM: MMU: map text segment ro and data segments execute never ARM: MMU64: map memory for barebox proper pagewise ARM: MMU64: map text segment ro and data segments execute never arch/arm/Kconfig | 12 +++++ arch/arm/cpu/mmu-common.h | 4 ++ arch/arm/cpu/mmu_32.c | 86 +++++++++++++++++++++++++++------ arch/arm/cpu/mmu_64.c | 101 +++++++++++++++++++++++++++++++++++---- arch/arm/cpu/uncompress.c | 9 ++-- arch/arm/include/asm/mmu.h | 2 +- arch/arm/include/asm/pgtable64.h | 1 + arch/arm/lib32/barebox.lds.S | 3 +- arch/arm/lib64/barebox.lds.S | 5 +- common/memory.c | 6 ++- include/mmu.h | 1 + 11 files changed, 198 insertions(+), 32 deletions(-) --- base-commit: 340e930140e76827cf5cac731e6afe2836e28242 change-id: 20250613-arm-mmu-xn-ro-1a1d996496ae Best regards, -- Sascha Hauer