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(unknown []) by gzga-smtp-mtada-g1-4 (Coremail) with SMTP id _____wD3dIl_0X5qdVL2Pg--.57693S2; Fri, 14 Aug 2026 16:27:44 +0800 (CST) From: Xiaofeng Yuan To: Paul Walmsley , Palmer Dabbelt , Albert Ou Cc: Alexandre Ghiti , Nam Cao , Klara Modin , prabhakar.csengg@gmail.com, linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, xiaofengmian@163.com Subject: [PATCH v5 0/2] riscv: fix text patching on minimal kernel configs Date: Fri, 14 Aug 2026 08:27:40 +0000 Message-ID: <20260814082742.148403-1-xiaofengmian@163.com> X-Mailer: git-send-email 2.43.0 MIME-Version: 1.0 X-CM-TRANSID: _____wD3dIl_0X5qdVL2Pg--.57693S2 X-Coremail-Antispam: 1Uf129KBjvJXoW7KryfZw18JF1UJr1xKw1ftFb_yoW8Jw4kpr WkAw4Yy3y8Xrnay39rCw1qkryYyws7CrWxGF18Jry3Xws5CayUXrn2gw1avF1kG3WY9w47 uFWSyr93u348t37anT9S1TB71UUUUU7qnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2 9KBjDUYxBIdaVFxhVjvjDU0xZFpf9x0piHa0PUUUUU= X-Originating-IP: [39.144.122.80] X-CM-SenderInfo: p0ld0w5hqjzxldq6il2tof0z/xtbC5gDO0Wp+0YAYTwAA3r X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260814_012846_536262_99027601 X-CRM114-Status: UNSURE ( 9.16 ) X-CRM114-Notice: Please train this message. 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 This series fixes two related issues that break kprobes and kernel text patching on RISC-V configurations where CONFIG_STRICT_MODULE_RWX is not available (e.g. CONFIG_MODULES=n). Patch 1 makes the EXECMEM_KPROBES range writable when CONFIG_STRICT_MODULE_RWX is disabled, so kprobe instruction slot writes do not fault on read-only executable pages. Patch 2 makes patch_map() skip the temporary fixmap mapping when the kernel text is already writable, i.e. when CONFIG_STRICT_KERNEL_RWX is disabled. The module text path is still gated on CONFIG_STRICT_MODULE_RWX. Changes since v4: - 2/2: gate the kernel text fixmap on CONFIG_STRICT_KERNEL_RWX instead of returning early on !CONFIG_STRICT_MODULE_RWX. The v4 early return broke configs with CONFIG_MODULES=n, where CONFIG_STRICT_MODULE_RWX is unavailable but CONFIG_STRICT_KERNEL_RWX is still enabled and the kernel text is read-only, causing a boot-time kernel panic on BPI-F3 and RZ/Five (reported by Klara Modin and Lad Prabhakar). Xiaofeng Yuan (2): riscv: mm: make EXECMEM_KPROBES writable without CONFIG_STRICT_MODULE_RWX riscv: patch: skip fixmap mapping when kernel text is already writable arch/riscv/kernel/patch.c | 2 ++ arch/riscv/mm/init.c | 4 +++- 2 files changed, 5 insertions(+), 1 deletion(-) -- 2.43.0 _______________________________________________ linux-riscv mailing list linux-riscv@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-riscv From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from m16.mail.163.com (m16.mail.163.com [117.135.210.2]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 5F8803EE1E9 for ; Fri, 14 Aug 2026 08:28:56 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=117.135.210.2 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786696142; cv=none; b=kvXxKhtdkRbNZhc10gDO2lW7JGq4dZFXDUTEok/7Hy75fHMvqUOH+6GfwRWqCVEqwnA190ryI6jGUd1FVQWmBYCCp2jHAwnM4+/VnKpnv7HJ93DpMwiRvZHLfsy1ZNpxkp+/X2VDW04zpSBT4SRECZ5sOOdRe4WrRYnn+h9X6+Y= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786696142; c=relaxed/simple; bh=ns/FgSeBUvUdlKb0G70ygJ2560s8ywqWasbVMDuc6sA=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=bMNzOMpqA4daiYjm6r/IKcwrxKxjAvHdR/lUosMAetqVUc0Geo0xpdZmsf/j0HBQd29F0POk1N1ezwdCM0pHnc/KEr87SQQet3wJSfTIOzmF357rQQppj7EJGm9trXtDCxfYYpc7LUD3lL+lWolc10s37u9uOjwa+1vgA4mXrrc= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=163.com; spf=pass smtp.mailfrom=163.com; dkim=pass (1024-bit key) header.d=163.com header.i=@163.com header.b=QUr94w0e; arc=none smtp.client-ip=117.135.210.2 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=163.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=163.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=163.com header.i=@163.com header.b="QUr94w0e" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=163.com; s=s110527; h=From:To:Subject:Date:Message-ID:MIME-Version; bh=aU p4toCDNHUBUim2j2yZWOkOE7XI6BPSPqqJrZpDCbE=; b=QUr94w0ex09qcRTXMg chJN5PWzESDZdfSPfrqX2B3UBXEzha5X00rJAB5ovZ4XvnUeDrcnQ4bwk0Liozun xw37ycomZx8v0EHKnWyW+LOz9hxR0FyAC/HMYPvvN3NQFBPIZqrOgquCS/OxKA0r vU/KH4Byt1fSkMJS6N91VDTGA= Received: from Ubuntu.. (unknown []) by gzga-smtp-mtada-g1-4 (Coremail) with SMTP id _____wD3dIl_0X5qdVL2Pg--.57693S2; Fri, 14 Aug 2026 16:27:44 +0800 (CST) From: Xiaofeng Yuan To: Paul Walmsley , Palmer Dabbelt , Albert Ou Cc: Alexandre Ghiti , Nam Cao , Klara Modin , prabhakar.csengg@gmail.com, linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, xiaofengmian@163.com Subject: [PATCH v5 0/2] riscv: fix text patching on minimal kernel configs Date: Fri, 14 Aug 2026 08:27:40 +0000 Message-ID: <20260814082742.148403-1-xiaofengmian@163.com> X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-CM-TRANSID:_____wD3dIl_0X5qdVL2Pg--.57693S2 X-Coremail-Antispam: 1Uf129KBjvJXoW7KryfZw18JF1UJr1xKw1ftFb_yoW8Jw4kpr WkAw4Yy3y8Xrnay39rCw1qkryYyws7CrWxGF18Jry3Xws5CayUXrn2gw1avF1kG3WY9w47 uFWSyr93u348t37anT9S1TB71UUUUU7qnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2 9KBjDUYxBIdaVFxhVjvjDU0xZFpf9x0piHa0PUUUUU= X-CM-SenderInfo: p0ld0w5hqjzxldq6il2tof0z/xtbC5gDO0Wp+0YAYTwAA3r This series fixes two related issues that break kprobes and kernel text patching on RISC-V configurations where CONFIG_STRICT_MODULE_RWX is not available (e.g. CONFIG_MODULES=n). Patch 1 makes the EXECMEM_KPROBES range writable when CONFIG_STRICT_MODULE_RWX is disabled, so kprobe instruction slot writes do not fault on read-only executable pages. Patch 2 makes patch_map() skip the temporary fixmap mapping when the kernel text is already writable, i.e. when CONFIG_STRICT_KERNEL_RWX is disabled. The module text path is still gated on CONFIG_STRICT_MODULE_RWX. Changes since v4: - 2/2: gate the kernel text fixmap on CONFIG_STRICT_KERNEL_RWX instead of returning early on !CONFIG_STRICT_MODULE_RWX. The v4 early return broke configs with CONFIG_MODULES=n, where CONFIG_STRICT_MODULE_RWX is unavailable but CONFIG_STRICT_KERNEL_RWX is still enabled and the kernel text is read-only, causing a boot-time kernel panic on BPI-F3 and RZ/Five (reported by Klara Modin and Lad Prabhakar). Xiaofeng Yuan (2): riscv: mm: make EXECMEM_KPROBES writable without CONFIG_STRICT_MODULE_RWX riscv: patch: skip fixmap mapping when kernel text is already writable arch/riscv/kernel/patch.c | 2 ++ arch/riscv/mm/init.c | 4 +++- 2 files changed, 5 insertions(+), 1 deletion(-) -- 2.43.0