From nobody Tue Nov 26 11:42:56 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=1708635014; cv=none; d=zohomail.com; s=zohoarc; b=Ad7wktUP2TAybmAOqYSt+8PznBT4vVd3RTZPnsTT0AcX/kwZWQYgfgeGib+Uw4x4welDcOiXKLwyZJ4E+v3q3O7LOEz+QRxdNVW2U5qaVCl1dA6aLblQ0Q9whOToFx7d2LkPNUQ3Uzi6hWh69JdUoKijEgeCQmDx8MeQL2BVGVQ= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1708635014; h=Content-Type:Content-Transfer-Encoding:Cc:Cc:Date:Date:From:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:MIME-Version:Message-ID:References:Sender:Subject:Subject:To:To:Message-Id:Reply-To; bh=48MAJNKY8itF/Uvxdy9leMjwL6Lq94BoHatvMOlA6tE=; b=kH8qBosm8A5Jq3Gjdskut4FiWNXVDVfR3U5GR6PrEKFtdwxUJuC/1QCHERSfuFS61SXHySNnV5o4YJ2jAqMd6SVKr25bhYe6JYi3MAAARCaLbxGmlvdSJNCBiP+o1+GbEh8wIBmHtK2KCD5xlnBKk0p67am3x0hpji/f6gzqvq8= 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 1708635014137274.2864184418071; Thu, 22 Feb 2024 12:50:14 -0800 (PST) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1rdFvI-0007XR-00; Thu, 22 Feb 2024 15:44:04 -0500 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 1rdFvE-0007PE-KU for qemu-devel@nongnu.org; Thu, 22 Feb 2024 15:44:00 -0500 Received: from mail-pl1-x629.google.com ([2607:f8b0:4864:20::629]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1rdFvC-0002ie-Hs for qemu-devel@nongnu.org; Thu, 22 Feb 2024 15:44:00 -0500 Received: by mail-pl1-x629.google.com with SMTP id d9443c01a7336-1dbf1fe91fcso492055ad.3 for ; Thu, 22 Feb 2024 12:43:58 -0800 (PST) Received: from stoup.. (173-197-098-125.biz.spectrum.com. [173.197.98.125]) by smtp.gmail.com with ESMTPSA id l12-20020a170902d34c00b001d8f81ecebesm10275500plk.192.2024.02.22.12.43.56 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 22 Feb 2024 12:43:56 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; t=1708634637; x=1709239437; darn=nongnu.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=48MAJNKY8itF/Uvxdy9leMjwL6Lq94BoHatvMOlA6tE=; b=XwPez6m+ao/Dw3QS8JcMSGkKzWjx80/oQytGgHK2J8BKZCgdKCbfxy0wRwfhaW/7rb npoKdNIVCu99riSQPSfVw7TpU5sYyPVp21CnhwLSv5ey+7h6m07sCqWM3o2nm3/UP+l7 cTcXDTar9xuTD7fFUHIo3lup8nYAxiQxxsLugOJFYfikkkHMmMRc3wkvEZBSou6q/ONu UWeOtIT8VpbD3Fn04nfAjPwv7qgNks1rY4BHEyPr/DlgNVl7+1ltgGYHNvIg/aTtUHfn qZuqjlFtGFKXb+xm+p7JhAqFbs+vdl07ml+vRPOI56++OSf9RoCR/AHkb/J6OeDzpJLL 6e3Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1708634637; x=1709239437; 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=48MAJNKY8itF/Uvxdy9leMjwL6Lq94BoHatvMOlA6tE=; b=Nq7b5AqhHGge51l/gUT319TDu4rlUOJELp8pcNM3uaGF/jSqepywHAFx5P1GpPx4Te mpH7aTeEPPVq1SyE3PcF1XbuUmG+fCJIa8tBg3k1q4G0/Dqyo8BazwTUWl67hs2cep9V YCTj+Qmiemp71r58/p3dazCBL41X5JYnxHGNJyDUk3KMDJfFnHChHh+McXgA1PvA0itR r6LsY4EfsFGvdOupQymvdS5i/VS1tUFoW0OkF1wCMzE9mW9/Q746LCvrO099etMYfzmw 8ygfZdPwIZoAeEW2iJB8JV3Aljtp7MWBUV3DNpNeX1mOLZxX1sQEC7ki9STiOwZQk/3B Vq1Q== X-Gm-Message-State: AOJu0Yz5ig/oNgwy5gV6u8Qxmr1Y3Tjp4B9ZKzg4WDqI0ed/1BuYgEc6 Atknpl4vBmQuQbSwvtPVa6R8noy/dEFQP9oKPMetZs2r/buJd3iYFRIWF4BF/5ABuT//KqpKZZ6 0 X-Google-Smtp-Source: AGHT+IFf3ay4fTeQQSa0LltVzFNHuf0JrjYlLsxRzEJl9iCH8bCvqOz/5ikRRAUH88sejUUxG1MHig== X-Received: by 2002:a17:903:286:b0:1db:c743:4687 with SMTP id j6-20020a170903028600b001dbc7434687mr19867029plr.1.1708634637332; Thu, 22 Feb 2024 12:43:57 -0800 (PST) From: Richard Henderson To: qemu-devel@nongnu.org Cc: =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= , Ilya Leoshkevich , Helge Deller Subject: [PULL 20/39] linux-user: Move some mmap checks outside the lock Date: Thu, 22 Feb 2024 10:43:04 -1000 Message-Id: <20240222204323.268539-21-richard.henderson@linaro.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240222204323.268539-1-richard.henderson@linaro.org> References: <20240222204323.268539-1-richard.henderson@linaro.org> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" 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=2607:f8b0:4864:20::629; envelope-from=richard.henderson@linaro.org; helo=mail-pl1-x629.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: 1708635014666100001 Basic validation of operands does not require the lock. Hoist them from target_mmap__locked back into target_mmap. Reviewed-by: Philippe Mathieu-Daud=C3=A9 Signed-off-by: Richard Henderson Reviewed-by: Ilya Leoshkevich Acked-by: Helge Deller Message-Id: <20240102015808.132373-18-richard.henderson@linaro.org> --- linux-user/mmap.c | 107 +++++++++++++++++++++++----------------------- 1 file changed, 53 insertions(+), 54 deletions(-) diff --git a/linux-user/mmap.c b/linux-user/mmap.c index b4c3cc65aa..fbaea832c5 100644 --- a/linux-user/mmap.c +++ b/linux-user/mmap.c @@ -491,52 +491,14 @@ abi_ulong mmap_find_vma(abi_ulong start, abi_ulong si= ze, abi_ulong align) } =20 static abi_long target_mmap__locked(abi_ulong start, abi_ulong len, - int target_prot, int flags, + int target_prot, int flags, int page_f= lags, int fd, off_t offset) { int host_page_size =3D qemu_real_host_page_size(); abi_ulong ret, last, real_start, real_last, retaddr, host_len; abi_ulong passthrough_start =3D -1, passthrough_last =3D 0; - int page_flags; off_t host_offset; =20 - if (!len) { - errno =3D EINVAL; - return -1; - } - - page_flags =3D validate_prot_to_pageflags(target_prot); - if (!page_flags) { - errno =3D EINVAL; - return -1; - } - - /* Also check for overflows... */ - len =3D TARGET_PAGE_ALIGN(len); - if (!len) { - errno =3D ENOMEM; - return -1; - } - - if (offset & ~TARGET_PAGE_MASK) { - errno =3D EINVAL; - return -1; - } - - /* - * If we're mapping shared memory, ensure we generate code for parallel - * execution and flush old translations. This will work up to the lev= el - * supported by the host -- anything that requires EXCP_ATOMIC will not - * be atomic with respect to an external process. - */ - if (flags & MAP_SHARED) { - CPUState *cpu =3D thread_cpu; - if (!(cpu->tcg_cflags & CF_PARALLEL)) { - cpu->tcg_cflags |=3D CF_PARALLEL; - tb_flush(cpu); - } - } - real_start =3D start & -host_page_size; host_offset =3D offset & -host_page_size; =20 @@ -616,23 +578,9 @@ static abi_long target_mmap__locked(abi_ulong start, a= bi_ulong len, passthrough_start =3D start; passthrough_last =3D last; } else { - if (start & ~TARGET_PAGE_MASK) { - errno =3D EINVAL; - return -1; - } last =3D start + len - 1; real_last =3D ROUND_UP(last, host_page_size) - 1; =20 - /* - * Test if requested memory area fits target address space - * It can fail only on 64-bit host with 32-bit target. - * On any other target/host host mmap() handles this error correct= ly. - */ - if (last < start || !guest_range_valid_untagged(start, len)) { - errno =3D ENOMEM; - return -1; - } - if (flags & MAP_FIXED_NOREPLACE) { /* Validate that the chosen range is empty. */ if (!page_check_range_empty(start, last)) { @@ -778,13 +726,64 @@ abi_long target_mmap(abi_ulong start, abi_ulong len, = int target_prot, int flags, int fd, off_t offset) { abi_long ret; + int page_flags; =20 trace_target_mmap(start, len, target_prot, flags, fd, offset); + + if (!len) { + errno =3D EINVAL; + return -1; + } + + page_flags =3D validate_prot_to_pageflags(target_prot); + if (!page_flags) { + errno =3D EINVAL; + return -1; + } + + /* Also check for overflows... */ + len =3D TARGET_PAGE_ALIGN(len); + if (!len || len !=3D (size_t)len) { + errno =3D ENOMEM; + return -1; + } + + if (offset & ~TARGET_PAGE_MASK) { + errno =3D EINVAL; + return -1; + } + if (flags & (MAP_FIXED | MAP_FIXED_NOREPLACE)) { + if (start & ~TARGET_PAGE_MASK) { + errno =3D EINVAL; + return -1; + } + if (!guest_range_valid_untagged(start, len)) { + errno =3D ENOMEM; + return -1; + } + } + mmap_lock(); =20 - ret =3D target_mmap__locked(start, len, target_prot, flags, fd, offset= ); + ret =3D target_mmap__locked(start, len, target_prot, flags, + page_flags, fd, offset); =20 mmap_unlock(); + + /* + * If we're mapping shared memory, ensure we generate code for parallel + * execution and flush old translations. This will work up to the lev= el + * supported by the host -- anything that requires EXCP_ATOMIC will not + * be atomic with respect to an external process. + */ + if (ret !=3D -1 && (flags & MAP_TYPE) !=3D MAP_PRIVATE) { + CPUState *cpu =3D thread_cpu; + if (!(cpu->tcg_cflags & CF_PARALLEL)) { + cpu->tcg_cflags |=3D CF_PARALLEL; + tb_flush(cpu); + } + } + return ret; } =20 --=20 2.34.1