From patchwork Sun Jul 9 18:29:07 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Richard Henderson X-Patchwork-Id: 1805421 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@legolas.ozlabs.org Authentication-Results: legolas.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org (client-ip=209.51.188.17; helo=lists.gnu.org; envelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org; receiver=) Authentication-Results: legolas.ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=linaro.org header.i=@linaro.org header.a=rsa-sha256 header.s=google header.b=Te502nSt; dkim-atps=neutral Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-ECDSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by legolas.ozlabs.org (Postfix) with ESMTPS id 4QzbcJ1j3Dz20XS for ; Mon, 10 Jul 2023 04:43:12 +1000 (AEST) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1qIZE9-0004Ui-Qd; Sun, 09 Jul 2023 14:33:45 -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 1qIZDu-0003Wp-DC for qemu-devel@nongnu.org; Sun, 09 Jul 2023 14:33:33 -0400 Received: from mail-wm1-x32b.google.com ([2a00:1450:4864:20::32b]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1qIZDq-0004ED-9a for qemu-devel@nongnu.org; Sun, 09 Jul 2023 14:33:29 -0400 Received: by mail-wm1-x32b.google.com with SMTP id 5b1f17b1804b1-3fbfa811667so19654605e9.1 for ; Sun, 09 Jul 2023 11:33:24 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; t=1688927604; x=1691519604; 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=QVp7bvOVNX9kOQlZjcnMWNBhc4o39/6I/4Tb+lJViFc=; b=Te502nStAJsDxJZLfJsnaWCc+RMx+MF1zCZjPakbbQtsg/Rc1mtz0RnR/0CeANyusO gIRnBrABCPxdL14RfGVY/REJR7og2Y+sFJHPF8lIiGVbdbw8B+OGcNQ+pMKEHkHaLkw7 tzEVrCxNxVq5llKILPE3bSqWAV2en3Q0cy5+XGRXn6z8UTTaCdg5rJdaNQhYqRUAFlto VN3WJypkEkEccQH4Lnb14C27MIWW4EF6C08dVQctBJIZSbu9GP6C8U8JozV5BbEG+8Fr G5PMvMiirbNzTok0x2PGGmQ9gg9uBdi8zVBWgGq68W4kMlUouNUlzz1dUwavC84g6nbV HQig== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1688927604; x=1691519604; 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=QVp7bvOVNX9kOQlZjcnMWNBhc4o39/6I/4Tb+lJViFc=; b=L55pMAj72HiEE7JikmKcs9pUrsr1uzpqJj11/2scs5GxQTuiVyFGDxgU9X5VW8BOMe TkKxme/FJBgQH8IHVekdvfRHJbO5n8qEcXePQgCd+FO1eJq5crO2gqdbzxYctlCMT18l emHOaBk9cfXhqPXQOdNiua/rGMy+asrtSBD/QJq+ZEEoet8oZ3tpDpYVKvnqPAJjdofb q7YWJhleyJdxJRb5Vy9EkAbVBJVg3b/7Rn5iuwMfppw5feBwY5CR/DAFeynAPiQgERjR wfwmhn5VAQZyWFTlUVZ0k2ZisAoDAhk+EHeLRhs/vM/U/hovNZMSAfTd4bW5UO5VFPMZ 0vvA== X-Gm-Message-State: ABy/qLZXdeLIyLctlSzvanNB8v2bBJnVaFY3IVecBnS0fgzOWTFSDJXv /3YUrCKpNSObOrZMl48/v5OAHRnS6WUl53EE+R7/fg== X-Google-Smtp-Source: APBJJlFZ7htkh0QP1Rqbz+dp/JAzhvbVd0K91B/JFK3zjInJPK/9e4EuxS3C/FK39oTy5Yp1RBZuGQ== X-Received: by 2002:a1c:cc02:0:b0:3fb:4064:7e22 with SMTP id h2-20020a1ccc02000000b003fb40647e22mr3602869wmb.19.1688927604024; Sun, 09 Jul 2023 11:33:24 -0700 (PDT) Received: from stoup.. ([148.252.133.210]) by smtp.gmail.com with ESMTPSA id e17-20020a5d4e91000000b0031433760a92sm9635256wru.115.2023.07.09.11.33.23 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 09 Jul 2023 11:33:23 -0700 (PDT) From: Richard Henderson To: qemu-devel@nongnu.org Cc: laurent@vivier.eu Subject: [PATCH 28/45] linux-user: Implement MAP_FIXED_NOREPLACE Date: Sun, 9 Jul 2023 19:29:07 +0100 Message-Id: <20230709182934.309468-56-richard.henderson@linaro.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230709182934.309468-1-richard.henderson@linaro.org> References: <20230709182934.309468-1-richard.henderson@linaro.org> MIME-Version: 1.0 Received-SPF: pass client-ip=2a00:1450:4864:20::32b; envelope-from=richard.henderson@linaro.org; helo=mail-wm1-x32b.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+incoming=patchwork.ozlabs.org@nongnu.org Sender: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Signed-off-by: Richard Henderson Message-Id: <20230707204054.8792-12-richard.henderson@linaro.org> --- 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 639921dba0..9dc34fc29d 100644 --- a/linux-user/mmap.c +++ b/linux-user/mmap.c @@ -509,7 +509,7 @@ abi_long target_mmap(abi_ulong start, abi_ulong len, int 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 = len + offset - host_offset; host_len = HOST_PAGE_ALIGN(host_len); start = mmap_find_vma(real_start, host_len, TARGET_PAGE_SIZE); @@ -551,7 +551,7 @@ abi_long target_mmap(abi_ulong start, abi_ulong len, int target_prot, } } - if (!(flags & MAP_FIXED)) { + if (!(flags & (MAP_FIXED | MAP_FIXED_NOREPLACE))) { unsigned long host_start; void *p; @@ -600,6 +600,13 @@ abi_long target_mmap(abi_ulong start, abi_ulong len, int target_prot, goto fail; } + /* Validate that the chosen range is empty. */ + if ((flags & MAP_FIXED_NOREPLACE) + && !page_check_range_empty(start, end - 1)) { + errno = EEXIST; + goto fail; + } + /* * worst case: we cannot map the file because the offset is not * aligned, so we read it @@ -615,7 +622,8 @@ abi_long target_mmap(abi_ulong start, abi_ulong len, int target_prot, goto fail; } retaddr = target_mmap(start, len, target_prot | PROT_WRITE, - MAP_FIXED | MAP_PRIVATE | MAP_ANONYMOUS, + (flags & (MAP_FIXED | MAP_FIXED_NOREPLACE)) + | MAP_PRIVATE | MAP_ANONYMOUS, -1, 0); if (retaddr == -1) { goto fail;