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 6E141C4450A for ; Sun, 19 Jul 2026 09:31:36 +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=60882D1sQjnJ5vNOj+a3UHHgKxW7rQwbx2RBbgDrS9s=; b=2vwZr7fp2xs0e1 6vW0sfLjeup3aoAeKdQQHzCJHpGe19f/4cl0aMbBWP5J32wTQc4oQDs0AdYXM47bSxRfXGDEqG6IB VTtnyiFqNFJELFKf0YiOjUL9XSzPDLf7VZtcm454bQWQpGeKWNT+Pce39XFNNog+9s0FRd87C0qlm viXDFBkdyAJFWXKo5NYqWnvowBn1bw4D8vXuQGduMIo1Yb2t/7Iyv6WdK/Fja7cvYELsWBzoqJjZb tGvf54Hh+RkUKPnE/BfeOWvgMvUn+zGqkelWNIleCJeQEdPnSYAfvAlihudNmitXBMBG3TpYA+A5t na0+AAYl/mZ3peBcKQHQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1wlNrj-00000004spj-0ksU; Sun, 19 Jul 2026 09:31:19 +0000 Received: from m16.mail.163.com ([220.197.31.2]) by bombadil.infradead.org with esmtps (Exim 4.99.1 #2 (Red Hat Linux)) id 1wlNrg-00000004soO-0KiA for linux-riscv@lists.infradead.org; Sun, 19 Jul 2026 09:31:17 +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=MR 1em4uw38DdLU279Tm9E4dNiS95LkceEmY7y3H4yaA=; b=cvNWvo2+HHlc8/5vsF UFqnRKBSg6KvqdT4Apkl93UR9ddCNjqdRoTI+G7yyiXnOcwfdi9nPGTTIS3TLJeF 2YNJZ925PShUT3gZzKsn1rbyuAwAeoEdHum5HpjhKNqtLV16RAjQGbhwWTsuizgs liRKAqr97GaDR7J09E0H+jdxE= Received: from Ubuntu.. (unknown []) by gzsmtp4 (Coremail) with SMTP id PygvCgCnTyswmVxqbA0SIA--.60699S3; Sun, 19 Jul 2026 17:30:25 +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 Subject: [PATCH v3 1/2] riscv: mm: make EXECMEM_KPROBES writable without CONFIG_STRICT_MODULE_RWX Date: Sun, 19 Jul 2026 09:30:23 +0000 Message-ID: <20260719093024.33351-2-xiaofengmian@163.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260719093024.33351-1-xiaofengmian@163.com> References: <20260719093024.33351-1-xiaofengmian@163.com> MIME-Version: 1.0 X-CM-TRANSID: PygvCgCnTyswmVxqbA0SIA--.60699S3 X-Coremail-Antispam: 1Uf129KBjvJXoW7Xw43Cw1DJF43uF15XrWrZrb_yoW8JrWxpr ZrCr45uFZ3Wr4Yy39ruw48ur4DAanIya17tw1jkry3t3yjyr90qrn8Xr17Xry8WF4Uua1x ZFn3uryfCayjka7anT9S1TB71UUUUU7qnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2 9KBjDUYxBIdaVFxhVjvjDU0xZFpf9x07Uuv35UUUUU= X-Originating-IP: [39.187.244.72] X-CM-SenderInfo: p0ld0w5hqjzxldq6il2tof0z/xtbDAREkJ2pcmTH-EAAA3i X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260719_023116_514174_91FBC3A1 X-CRM114-Status: UNSURE ( 9.62 ) 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) arch/riscv/mm/init.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/arch/riscv/mm/init.c b/arch/riscv/mm/init.c index 5b1b3c88b4..c3367ff35b 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