From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id ADA87C44515 for ; Mon, 20 Jul 2026 03:24:08 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-ID:Date:Subject:Cc:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=4LynE5FDwrMdaiy9oUo54S4TF+kss6iZvQ180P0a1Y8=; b=HcOrxV3jhDrrYp Hji3A733atZr1U9h7lsSNUpygShVTrP3+fmOU39JlFApe7o9ute/WSh0cYO2knhjhBwM1Difn+W5B 4rlo0+2BunDgeQRQqJ7IGQFhaC9yMQak2vLXuXAW5lwni9+v+7+EUT0qMTotY2882EbiDPTMhcDp0 1WbCrGs9b0Hy9ODiBQ+k090w1cz2xxT+nsLSXGgZ0UoVRxq5SLjnOiOFLdQ2LJQH6L86nMo7Kiq4R zTActNLDDhIXohsx5Z/vnKpDiCxEDfaOY+r1rT3hqMPK5qBPiEoTgXBLfFi+5meCCK4TH/2gBgtDy zgVDQPOUb0gsCAmCeEBg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1wlebh-00000005l0F-3xfI; Mon, 20 Jul 2026 03:23:53 +0000 Received: from m16.mail.163.com ([117.135.210.5]) by bombadil.infradead.org with esmtps (Exim 4.99.1 #2 (Red Hat Linux)) id 1wlebe-00000005kyV-2uOj for linux-riscv@lists.infradead.org; Mon, 20 Jul 2026 03:23:52 +0000 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=CQ bEMG8C6NQudrZtH6JGNGhbxssqV+FTapBCimwsn+Q=; b=J2Mzkjz/31UW6MGAf0 5uv8veLaUDyDenbNUovT/xUqMzwiYoIqg1EnK5N96yV1GZbYWBJc/y7VO1GtvZfy NmkTGPIWEE4IZKCsUW9ypTudj881tdAj+OcSOPkhxvLqGz55psvWJqBJ0dHeoRQN i+s1wFnPOtoXryP7b45XnpTTM= Received: from Ubuntu.. (unknown []) by gzsmtp3 (Coremail) with SMTP id PigvCgBH+wKTlF1qrd2XIg--.2654S3; Mon, 20 Jul 2026 11:23:01 +0800 (CST) From: Xiaofeng Yuan To: Paul Walmsley , Palmer Dabbelt , Albert Ou Cc: Alexandre Ghiti , Nam Cao , linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, xiaofengmian@163.com Subject: [PATCH v4 1/2] riscv: mm: make EXECMEM_KPROBES writable without CONFIG_STRICT_MODULE_RWX Date: Mon, 20 Jul 2026 03:22:56 +0000 Message-ID: <20260720032258.5188-2-xiaofengmian@163.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260720032258.5188-1-xiaofengmian@163.com> References: <20260720032258.5188-1-xiaofengmian@163.com> MIME-Version: 1.0 X-CM-TRANSID: PigvCgBH+wKTlF1qrd2XIg--.2654S3 X-Coremail-Antispam: 1Uf129KBjvJXoW7Xw43Cw1DJF43uF15XrWrZrb_yoW8JrW5pr ZrAr45ZFZ7Xr4Yk3y7u3y8ur4DAanIya13Jw1jyryYq3yjy390qr95Zr1xXry8WF1Uuayx ZFna9r93Aayjka7anT9S1TB71UUUUU7qnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2 9KBjDUYxBIdaVFxhVjvjDU0xZFpf9x0pi7UUUUUUUU= X-Originating-IP: [223.104.164.77] X-CM-SenderInfo: p0ld0w5hqjzxldq6il2tof0z/xtbDARU8P2pdlJU6HwAA3E X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260719_202351_376019_054BDE3D X-CRM114-Status: UNSURE ( 6.33 ) 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 When CONFIG_STRICT_MODULE_RWX is not set, execmem cannot create temporary writable mappings for read-only executable pages. In this case, the execmem ranges must already have writable permissions. Currently EXECMEM_KPROBES unconditionally uses PAGE_KERNEL_READ_EXEC, which causes kprobe instruction slot writes to trigger page faults on systems where CONFIG_STRICT_MODULE_RWX is not enabled. Fix this by using PAGE_KERNEL_EXEC when CONFIG_STRICT_MODULE_RWX is not available. Signed-off-by: Xiaofeng Yuan --- v2: use CONFIG_STRICT_MODULE_RWX instead of CONFIG_ARCH_HAS_EXECMEM_ROX (per Nam Cao's review) v3: add commit description v4: fix indent alignment (per Nam Cao's review) diff --git a/arch/riscv/mm/init.c b/arch/riscv/mm/init.c index 5b1b3c88b4..7951d72a12 100644 --- a/arch/riscv/mm/init.c +++ b/arch/riscv/mm/init.c @@ -1457,7 +1457,9 @@ struct execmem_info __init *execmem_arch_setup(void) [EXECMEM_KPROBES] = { .start = VMALLOC_START, .end = VMALLOC_END, - .pgprot = PAGE_KERNEL_READ_EXEC, + .pgprot = IS_ENABLED(CONFIG_STRICT_MODULE_RWX) ? + PAGE_KERNEL_READ_EXEC : + PAGE_KERNEL_EXEC, .alignment = 1, }, [EXECMEM_BPF] = { -- 2.43.0 _______________________________________________ linux-riscv mailing list linux-riscv@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-riscv