From nobody Thu Oct 9 10:02:58 2025 Received: from mail-pj1-f52.google.com (mail-pj1-f52.google.com [209.85.216.52]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 4FB191FAC34 for ; Thu, 19 Jun 2025 01:04:52 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.216.52 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1750295093; cv=none; b=J7/ENP6ax8ERQtnS9dZYjMgg7l4W/W1k9oQFSob5bkUgrIqBRwNFd+FjcA3k20UpBEJ6UqMW1zNgytdBGwrFFlqjnx9C+l+o9UEPh0wv3JLY2j3HycTvxjoegkigMbGqvAFXOym5eJ9/E5yB6mm6ayRctb0q+OG/WWDEgSBDDZs= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1750295093; c=relaxed/simple; bh=YUEZeH1TUt8vhd5nOMxaCkzJVaWiSM7ZZlNxkfxZqDc=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=Ms47E0PbdDte5HIJTNhUNFMDoNofjCiQR5+mfoW03+SN+QJOYTzOId5ZInWy4zh+V1RVQDYGciiGtWEfC65ZoTIkVlj0QppM/y/2gTww9PcKyKSlccbX2oLoRDaHgVxX53OKx3wdFH/h02bncwHaGqf5MBap6GWD1/EHwvt6iXw= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=GWMv+dlb; arc=none smtp.client-ip=209.85.216.52 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="GWMv+dlb" Received: by mail-pj1-f52.google.com with SMTP id 98e67ed59e1d1-311d5fdf1f0so153043a91.1 for ; Wed, 18 Jun 2025 18:04:52 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1750295092; x=1750899892; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=0G7VVQnGQtrb3sGnx5GNm2Y3zP47y1QHGJfHFp/BsUc=; b=GWMv+dlbqHDc90BMa0qyhxPV1l/V164WnFnh1vB4IQrSyyRC/joyjAdeSktfNd91id rmFXV0gurkO8MjvvkUwsbbHXtW1KVdcJreTQSiZb1DZKUbJMmaTQxFQj8u1XN3qNG+Rd V8ioiWvyu2DQEAaUb5Ene+5hBJ/kaZSKDxJqciPN0wLreH4+Vn+VXAQUxgj7wIIWbkxM 23Il699pFGcri7hTKb1rLv8A0e9EuQuz4s8TrXzqt1m/WXPGGOm/d5UXCjJhi5F8RaQw EcIkkrIxjKXMk9XL7Fs0TBtuVzeR+hQwEvCLogcdUyF9QIIWZglegAob18Lo29y9A8Ij oT3w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1750295092; x=1750899892; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=0G7VVQnGQtrb3sGnx5GNm2Y3zP47y1QHGJfHFp/BsUc=; b=NVCInRDIK32zCOFbt1J54EwuJo1KRM0v0qPFhrUQ2G51QWf+var36AMY3wSvGnd3YX vYhdobHOyYDaLjz9/6TnEUmHA5U71T7UuXBZWcllW4N5F6boEFtsqPtXhaHQ++EW77jj CYL5/SgVMLH5OMg+NedS9/oAezTMDA1MOscxkB7270js4T1ev6ZAaBvkqmAkCSgWWSfQ 5/nUIE8vVskJ9U0jeiM5+EwwNDH+4/9f+SiyyQoBLZgIddPMFXiRaFK/gxAc2bmsF3UR nHyYzTF+S7Au/cWOpuQnMNdp7WxvmmJ5g4l7RPpA4lvWgeztbQ2aYAd+ttKRGX1lzM6+ r4cw== X-Forwarded-Encrypted: i=1; AJvYcCWOXPj1hSvm7HzvofLx2j1QVhNeGckkIGWNUnFZaSbyn+wNIZQfiamYB6DE2OlzI0pWgYeK9WqFEobUinc=@vger.kernel.org X-Gm-Message-State: AOJu0YwpAjDLK5rIuuwF/Y4WtUpbLdRVTDdRWa35u/7iboTjRGdj3Ong eSjMkD4nwgw7rnC2pQ60c9xje40IPXPl0qACM334GwCMaLRVKndW/++A X-Gm-Gg: ASbGncvu3GLsDQhyHHFybLkeZVY1AU2J7aaKiKfGEKvjknFRsHsUMJgqBDxoIBYu0rB 3doJA5auJVH1JNRxrc++gf71pxiPDEYRlinyTkuJ56oB73RgRptEHwVXpvPopwUPP8ohua64Ut6 EuKUfQVP3jmh8beyhNYE8N8JIQj5USGkhz+rNgdSga2raRBnl7oFdF5yF7vtyn8nZpcwuUrGpK/ 7z31CaF8WdozothEdPbZGASs96T6rwW4SDlDnzW0syWRrzrbmzf+qDCFLF++pHYmgKu+HhnClWW Prb5wuJdgH939UJ0SDCkz7hsswnJyTXo03j4DhoPioROeT7wWOWX8GGsPe06QbLm02aEXyv+hXX PLAKPN7p3G0eIEP5Zz3xmEZGLLJznPblW X-Google-Smtp-Source: AGHT+IFATU8cH8BDAswTDg8t16Qex6ZAiu2Oi4jWZUV6j/DJuzeYMglD71cpXwlvvkHyyfeb+uGavw== X-Received: by 2002:a17:90b:268a:b0:313:283e:e881 with SMTP id 98e67ed59e1d1-313f1cc5abbmr29510777a91.11.1750295091595; Wed, 18 Jun 2025 18:04:51 -0700 (PDT) Received: from ikb-h07-29-noble.in.iijlab.net ([202.214.97.5]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-3158a25617asm840600a91.33.2025.06.18.18.04.50 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 18 Jun 2025 18:04:50 -0700 (PDT) Received: by ikb-h07-29-noble.in.iijlab.net (Postfix, from userid 1010) id 26684ED6538; Thu, 19 Jun 2025 10:04:48 +0900 (JST) From: Hajime Tazaki To: linux-um@lists.infradead.org Cc: thehajime@gmail.com, ricarkol@google.com, Liam.Howlett@oracle.com, linux-kernel@vger.kernel.org Subject: [PATCH v9 08/13] x86/um/vdso: nommu: vdso memory update Date: Thu, 19 Jun 2025 10:04:12 +0900 Message-ID: <207204e01eab3318e475f80be9fbaece51dd13cb.1750294482.git.thehajime@gmail.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" On !MMU mode, the address of vdso is accessible from userspace. This commit implements the entry point by pointing a block of page address. This commit also add memory permission configuration of vdso page to be executable. Signed-off-by: Hajime Tazaki Signed-off-by: Ricardo Koller --- arch/x86/um/vdso/vma.c | 17 +++++++++++++++-- 1 file changed, 15 insertions(+), 2 deletions(-) diff --git a/arch/x86/um/vdso/vma.c b/arch/x86/um/vdso/vma.c index dc8dfb2abd80..1c8c39f87681 100644 --- a/arch/x86/um/vdso/vma.c +++ b/arch/x86/um/vdso/vma.c @@ -9,6 +9,7 @@ #include #include #include +#include =20 static unsigned int __read_mostly vdso_enabled =3D 1; unsigned long um_vdso_addr; @@ -21,14 +22,24 @@ static int __init init_vdso(void) { BUG_ON(vdso_end - vdso_start > PAGE_SIZE); =20 - um_vdso_addr =3D task_size - PAGE_SIZE; - um_vdso =3D alloc_page(GFP_KERNEL); if (!um_vdso) goto oom; =20 copy_page(page_address(um_vdso), vdso_start); =20 +#ifdef CONFIG_MMU + um_vdso_addr =3D task_size - PAGE_SIZE; +#else + /* this is fine with NOMMU as everything is accessible */ + um_vdso_addr =3D (unsigned long)page_address(um_vdso); + os_protect_memory((void *)um_vdso_addr, vdso_end - vdso_start, 1, 0, 1); +#endif + + pr_info("vdso_start=3D%lx um_vdso_addr=3D%lx pg_um_vdso=3D%lx", + (unsigned long)vdso_start, um_vdso_addr, + (unsigned long)page_address(um_vdso)); + return 0; =20 oom: @@ -39,6 +50,7 @@ static int __init init_vdso(void) } subsys_initcall(init_vdso); =20 +#ifdef CONFIG_MMU int arch_setup_additional_pages(struct linux_binprm *bprm, int uses_interp) { struct vm_area_struct *vma; @@ -63,3 +75,4 @@ int arch_setup_additional_pages(struct linux_binprm *bprm= , int uses_interp) =20 return IS_ERR(vma) ? PTR_ERR(vma) : 0; } +#endif --=20 2.43.0