From mboxrd@z Thu Jan 1 00:00:00 1970 Delivery-date: Tue, 17 Jun 2025 19:11:02 +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 1uRZpt-008LBe-2l for lore@lore.pengutronix.de; Tue, 17 Jun 2025 19:11:01 +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 1uRZpt-0001yn-3i for lore@pengutronix.de; Tue, 17 Jun 2025 19:11:01 +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=x9vfKqCNLr1ffaE/h9Hw8/RsbvjkCTyr/hsz77F1dhg=; b=WuMEB3SdTO114hKec575BcMtEI uhHP2KyqUcBs9o43RNRSOr3cbLumri3cpnlM38Tnn/6qs52bVa3gpoNBtfibOqvorQKPgAjuLRHjh D+U/9zh2kiahnlDH2X8qQa2AUEMWPPnWMaVKZ/+ZkIjJW9a1xZKEIyB+302yecROfsO30GHzs3s2b L+E7lksSvCd8Af3DUC1ENSBGTI8gfV6YoBo4FuP1C0rU5tkhby1zFYbYos4yU/obpGs7FPSOh9Vt/ UMY/5KNNAyF3a+vII7MRaMt7HKN/2fAeTS5wZSpyknQdTFNCuzWXUvQby19LourDGu2aaH8kKTjkm BVMGqAPg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1uRZpa-00000007xgL-3ZaI; Tue, 17 Jun 2025 17:10:42 +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 1uRXIU-00000007YVi-1PpT for barebox@lists.infradead.org; Tue, 17 Jun 2025 14:28:23 +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 1uRXIL-0007nX-42; Tue, 17 Jun 2025 16:28:13 +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 1uRXIK-003zFj-2n; Tue, 17 Jun 2025 16:28:12 +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 1uRXIK-00Gvg5-2N; Tue, 17 Jun 2025 16:28:12 +0200 From: Sascha Hauer Date: Tue, 17 Jun 2025 16:28:07 +0200 Message-Id: <20250617-mmu-xn-ro-v2-0-3c7aa9046b67@pengutronix.de> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit X-B4-Tracking: v=1; b=H4sIAHd7UWgC/23MQQ7CIBCF4as0s3YMIKJx1XuYLrCM7SwKDbQNp uHuYtcu/5eXb4dEkSnBo9kh0saJg6+hTg30o/UDIbvaoIS6CiMMTtOK2WMMSMrqXr/EXVgN9T9 HenM+rGdXe+S0hPg56E3+1n/KJlHgjcg45+RFO93O5Id1icFzPjuCrpTyBZ8BplynAAAA X-Change-ID: 20250606-mmu-xn-ro-e2a4c4b080a4 To: Ahmad Fatoum , BAREBOX X-Mailer: b4 0.14.2 X-Developer-Signature: v=1; a=ed25519-sha256; t=1750170492; l=2138; i=s.hauer@pengutronix.de; s=20230412; h=from:subject:message-id; bh=g1S9a90aD6DPMl9bZP7ZMQms7FyoJL/EmBs55dsBIlU=; b=UqkEU8bcYLm8J5tCG6qqsYWnm1HW/wQ21SfxtetXdsQ0jHuy6xQZboNwirtAu/uP+SbSCfFda NlcCxqS8vCDAabAc0WLit4G2qriz6ZM9cJFhiEOEAUN3PmJGAmXCvsk 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-20250617_072822_384767_65A301AB X-CRM114-Status: GOOD ( 11.16 ) 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=-6.2 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 v2 0/6] 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 ARMv5, 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. Signed-off-by: Sascha Hauer --- Changes in v2: - Tested and fixed for ARMv5 - merge create_pages() and create_sections() into one functions (ahmad) - introduce function to create mapping flags based on CONFIG_ARM_MMU_PERMISSIONS - Link to v1: https://lore.barebox.org/20250606-mmu-xn-ro-v1-0-7ee6ddd134d4@pengutronix.de --- Sascha Hauer (6): 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/lowlevel_32.S | 1 + arch/arm/cpu/mmu-common.h | 20 +++++++++ arch/arm/cpu/mmu_32.c | 89 ++++++++++++++++++++++++++++++++-------- arch/arm/cpu/mmu_64.c | 82 +++++++++++++++++++++++++++--------- 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 | 7 +++- include/mmu.h | 1 + 12 files changed, 186 insertions(+), 46 deletions(-) --- base-commit: 2ae2aa65792b5634e1e9b682fa7ef649569800d4 change-id: 20250606-mmu-xn-ro-e2a4c4b080a4 Best regards, -- Sascha Hauer