From nobody Thu Sep 19 03:34:54 2024 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=pass(p=none dis=none) header.from=linaro.org ARC-Seal: i=1; a=rsa-sha256; t=1688131424; cv=none; d=zohomail.com; s=zohoarc; b=MUSmWZubVZ/AfwfG6rA5QSyn/4cdEfEcsjQ8UdPW1IhaU9lv4lPFqG1QSkrl+2v4x60Z38tQQgg+xaawshqjdJvI5MLY9cJlLlbIt8H8H/4ibDwVZeFHkq3kCP9mItHZ+xQB6cukNbDCYaVnNZt8rfSIEIKdVOb/aOs+asJfNdI= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1688131424; h=Content-Transfer-Encoding:Cc:Date:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:MIME-Version:Message-ID:References:Sender:Subject:To; bh=KrYEO83mUZLefivMHniXeqFBDxyfnNPTYsBHzpccNBQ=; b=NZ+7sLjNHbfZP+D2MnWyKkcg00UPL1CinZReHQr6nJS2q5Kn3rPSsULcxRQgNJXeGJ/2dGBSo2FCW/+CHgRjL1oMcoJZMBbH4yVU0EQ/eYru6PykIOhDFNVPuIYgxNCWyBj7aGQWePuU1SgV+NUVUeTPOxcAML0jAxIeSuDY/Ic= ARC-Authentication-Results: i=1; mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=pass header.from= (p=none dis=none) Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 168813142444992.08694912666806; Fri, 30 Jun 2023 06:23:44 -0700 (PDT) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1qFE4k-0007gT-Kg; Fri, 30 Jun 2023 09:22:14 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1qFE4g-0007bo-TE for qemu-devel@nongnu.org; Fri, 30 Jun 2023 09:22:10 -0400 Received: from mail-wr1-x42a.google.com ([2a00:1450:4864:20::42a]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1qFE4f-0003Pi-8T for qemu-devel@nongnu.org; Fri, 30 Jun 2023 09:22:10 -0400 Received: by mail-wr1-x42a.google.com with SMTP id ffacd0b85a97d-313e34ab99fso2025483f8f.1 for ; Fri, 30 Jun 2023 06:22:08 -0700 (PDT) Received: from localhost.localdomain ([139.47.41.96]) by smtp.gmail.com with ESMTPSA id a16-20020adfdd10000000b00313ef2150dcsm14571092wrm.45.2023.06.30.06.22.07 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 30 Jun 2023 06:22:07 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; t=1688131328; x=1690723328; 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=KrYEO83mUZLefivMHniXeqFBDxyfnNPTYsBHzpccNBQ=; b=LXYUpdWrRnIAD1HM6dGh+2e903minFPvPqaLvgDsIHpVZ+3Mlh/GrzybUBu0gQR+Ug Yj3+hKguXBr/5DqXhG4Xe2qISjIS3VNDYDmqhXxmEeeugWB/t02EDUJulRT68/Cakr1o v/tMgCuHQ08x9wjzI6crDrfA8YtjGcTXYzrfSi+U8MQWltpFsNgZAavS1C3twDfLVWL8 RBBWaOEThYCOz7z8K2eOP8E2qlWbLNb+vhLDx2ghcdKC+Fq71dgCwDGMLijVEe3uU1pe 7pMGWqZWN+SfUTMYydRu7Yl29USxhRMoM10FoAXfLCjHYqE1W75ciu37El+lCNdZFNVD aHPQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1688131328; x=1690723328; 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=KrYEO83mUZLefivMHniXeqFBDxyfnNPTYsBHzpccNBQ=; b=YvluMkCbTxARkyFAEv05XWklGZt88XSIgX+33LUgxRScgDcUKdMLVWASkYgIy0mddH QwQnV5rXckeAuUlIdcxWcaVHNQBPi0on5h0fBhT/MMfb96QvH9iKuAusooEIf3D+MC2T NEZnuxYPpT4bp2Op6aDvDoAdQIrlpOHwiDdwDm82h543QgTz0swryX8N6qgAQ4u4fxyd 59Fg5Tgs8OO844Mb2QnT8fuVylL914DXl1x2PNBgQwK2rXLF9PhM4QPILQ4MgOEP8ZT+ S4T+NcjRBitR5aOVD4ncASa42CVwWQdElzSNetxCWu+pJxDPUFgsA9CZFFWdZa8QPQrF Ex2w== X-Gm-Message-State: ABy/qLY5p2+slTcMZFVeES4Pa5FZ3TlxuPuzuLml3sRYYW1uGsMfYZxp 2onWXVlmu3eUUmMIeN7OLv+sXJzNWbdifHOE/sPnYg== X-Google-Smtp-Source: APBJJlEy+WFHtHVYVoyWWsfXT3QgakM0FCl36Gku7relYk6vN/jPtye+CmHpxhHkVA3Ln+NXYA2BJA== X-Received: by 2002:adf:fc12:0:b0:314:14ea:e2db with SMTP id i18-20020adffc12000000b0031414eae2dbmr2088627wrr.0.1688131327731; Fri, 30 Jun 2023 06:22:07 -0700 (PDT) From: Richard Henderson To: qemu-devel@nongnu.org Cc: mjt@tls.msk.ru, laurent@vivier.eu Subject: [PATCH 09/24] linux-user: Implement MAP_FIXED_NOREPLACE Date: Fri, 30 Jun 2023 15:21:44 +0200 Message-Id: <20230630132159.376995-10-richard.henderson@linaro.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230630132159.376995-1-richard.henderson@linaro.org> References: <20230630132159.376995-1-richard.henderson@linaro.org> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=2a00:1450:4864:20::42a; envelope-from=richard.henderson@linaro.org; helo=mail-wr1-x42a.google.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @linaro.org) X-ZM-MESSAGEID: 1688131425887100001 Content-Type: text/plain; charset="utf-8" Signed-off-by: Richard Henderson --- linux-user/mmap.c | 14 +++++++++++--- 1 file changed, 11 insertions(+), 3 deletions(-) diff --git a/linux-user/mmap.c b/linux-user/mmap.c index cb5369d2d1..41c2f09fd5 100644 --- a/linux-user/mmap.c +++ b/linux-user/mmap.c @@ -502,7 +502,7 @@ abi_long target_mmap(abi_ulong start, abi_ulong len, in= t target_prot, * If the user is asking for the kernel to find a location, do that * before we truncate the length for mapping files below. */ - if (!(flags & MAP_FIXED)) { + if (!(flags & (MAP_FIXED | MAP_FIXED_NOREPLACE))) { host_len =3D len + offset - host_offset; host_len =3D HOST_PAGE_ALIGN(host_len); start =3D mmap_find_vma(real_start, host_len, TARGET_PAGE_SIZE); @@ -544,7 +544,7 @@ abi_long target_mmap(abi_ulong start, abi_ulong len, in= t target_prot, } } =20 - if (!(flags & MAP_FIXED)) { + if (!(flags & (MAP_FIXED | MAP_FIXED_NOREPLACE))) { unsigned long host_start; void *p; =20 @@ -593,6 +593,13 @@ abi_long target_mmap(abi_ulong start, abi_ulong len, i= nt target_prot, goto fail; } =20 + /* Validate that the chosen range is empty. */ + if ((flags & MAP_FIXED_NOREPLACE) + && !page_check_range_empty(start, end - 1)) { + errno =3D EEXIST; + goto fail; + } + /* * worst case: we cannot map the file because the offset is not * aligned, so we read it @@ -608,7 +615,8 @@ abi_long target_mmap(abi_ulong start, abi_ulong len, in= t target_prot, goto fail; } retaddr =3D target_mmap(start, len, target_prot | PROT_WRITE, - MAP_FIXED | MAP_PRIVATE | MAP_ANONYMOUS, + (flags & (MAP_FIXED | MAP_FIXED_NOREPLAC= E)) + | MAP_PRIVATE | MAP_ANONYMOUS, -1, 0); if (retaddr =3D=3D -1) { goto fail; --=20 2.34.1