From nobody Sun Apr 12 02:49:26 2026 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; arc=pass (i=1 dmarc=pass fromdomain=epfl.ch); dmarc=pass(p=quarantine dis=none) header.from=epfl.ch ARC-Seal: i=2; a=rsa-sha256; t=1772460357; cv=pass; d=zohomail.com; s=zohoarc; b=LjSfiwRlirmgRjpIzL/5dsg0baLD1KqCvuGF8yx9HoAowtGC1aeYvsVL7/lEL4n8ImC8vc2NAQO+zdhRYQdimzosM0pZasB9NI00cqHn30MDrXmoILgpCQP84TTMfVZ+uQ+T/ub2+bkIjXFo2PoOyHqA3iqtMwX4yUfsj7TE/fY= ARC-Message-Signature: i=2; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1772460357; 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=ZKtxL6WewZUTPxTTW+USh+IA6Bm3oeqYjU4DEzcZtME=; b=QSfnpVXq96aap/cfLPy/OwCJWCuAJozpVRm4t/z8cDZ3aIatVGKcFxLB5dcDwAbXTFRdI6xkpJDqNkt5eT+tqbIgJYPEolwBFB6xlT/HJjgpkV1rAn/ePiwTxZdFZ0aq/cyr70DIiJIAeBOL9X3pdBlPOp3R6WP9Mo1gJ8saF2k= ARC-Authentication-Results: i=2; 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; arc=pass (i=1 dmarc=pass fromdomain=epfl.ch); dmarc=pass header.from= (p=quarantine dis=none) Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1772460357034123.73742062273175; Mon, 2 Mar 2026 06:05:57 -0800 (PST) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1vx3td-00067i-DD; Mon, 02 Mar 2026 09:05:18 -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 1vx3sS-000535-7x for qemu-devel@nongnu.org; Mon, 02 Mar 2026 09:04:18 -0500 Received: from mail-switzerlandwestazlp170100001.outbound.protection.outlook.com ([2a01:111:f403:c214::1] helo=GVAP278CU002.outbound.protection.outlook.com) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1vx3sQ-0003rA-04 for qemu-devel@nongnu.org; Mon, 02 Mar 2026 09:04:04 -0500 Received: from ZRH2PFAD84B9AF9.CHEP278.PROD.OUTLOOK.COM (2603:10a6:918::220) by GV0P278MB1029.CHEP278.PROD.OUTLOOK.COM (2603:10a6:710:4e::13) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.9654.21; Mon, 2 Mar 2026 14:03:47 +0000 Received: from ZRH2PFAD84B9AF9.CHEP278.PROD.OUTLOOK.COM ([fe80::80ea:3d03:40bf:998c]) by ZRH2PFAD84B9AF9.CHEP278.PROD.OUTLOOK.COM ([fe80::80ea:3d03:40bf:998c%6]) with mapi id 15.20.9654.020; Mon, 2 Mar 2026 14:03:46 +0000 ARC-Seal: i=1; a=rsa-sha256; s=arcselector10001; d=microsoft.com; cv=none; b=QnEr0Wp+Jp2kqmVv41+TkMZ8fY7MiZKwbv3eWPV2PbAeqFLfwqWT4W7hFYgdF9hMAUxJrOC6mXbufmpdkXsJKtb9IPYcatG4J3Sd84/CEZNISQXopBdbxFkuPZ+0IuJwhVRqYcByR28qi04goh3eLExwwSW6/r3iuNqqPh4VS3rWtAlp0BJVjuWNLaSN4X5Edyb5KYgpI/uMWCJgPRjwBqRKHa6WASO0speCvahv1YFZ6OJJ7wtgdyFjkUJgD+adNdyfFeoTvJuHQqSBVLh0aoK+OieVnNJgpkI7N74FsfXCIY1u/k6CbbVF4ghXzwu6FbR+WGMRlZGoUHkQ15VAvQ== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector10001; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-AntiSpam-MessageData-ChunkCount:X-MS-Exchange-AntiSpam-MessageData-0:X-MS-Exchange-AntiSpam-MessageData-1; bh=ZKtxL6WewZUTPxTTW+USh+IA6Bm3oeqYjU4DEzcZtME=; b=CQgcJg39eioDbcyp4H/gn87h5Zk7JpfDOqSiRAubzbuqfu7OWqG63uFcBudnSrmpkzQaq7MLCF5ClynUR1fHaYNF9Kp1rpgHlvLTUX68UFaFCbS3NgjBeBb4t0tCSusOmHtOoDaCBZ1R9xqfo4OMnKXQBrz0C4k602C0InHDlXztMCc7FuQwhYLhMQzkcQZ29IlnW90exHPYy3ljmPs18rSzYQKO5zQhuZ4XR9iriBANXohzy6VsrLXqY2N7yG6wf+EEgIMuEeDwmDHQLUZUbm/aBvK/PuOQQVUWsOv1zij10smM34gjdv6y9wYu1CDMbYkOCt8Rg0QDr9DxJau9tQ== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=epfl.ch; dmarc=pass action=none header.from=epfl.ch; dkim=pass header.d=epfl.ch; arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=epfl.ch; s=selector1; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=ZKtxL6WewZUTPxTTW+USh+IA6Bm3oeqYjU4DEzcZtME=; b=cWIosrRIzLTA7BZLdL9SVKvNlwyjNVkW4JaoHjcwtle1RMHaP0OtEPpZg1dWxcAp5hQdz2En6V3i20rLpEyDLc1uSVz44NMAugfhhYsxHf0Fk35BcRTAQKgkM5SjPUsW9u81ywkvvfm2kanUwQOqj4vwbBJvnraNTrYINvqWFlY= Authentication-Results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=epfl.ch; Message-ID: Date: Mon, 2 Mar 2026 14:56:54 +0100 User-Agent: Mozilla Thunderbird Subject: [PATCH v5 2/7] linux-user: make syscall emulation interruptible From: Florian Hofhammer To: qemu-devel@nongnu.org Cc: alex.bennee@linaro.org, pierrick.bouvier@linaro.org, richard.henderson@linaro.org, laurent@vivier.eu, imp@bsdimp.com, berrange@redhat.com References: <1739da2c-2ea6-4bc7-be6f-981f8658ce3f@epfl.ch> Content-Language: en-US Autocrypt: addr=florian.hofhammer@epfl.ch; keydata= xsFNBFw7TEkBEADaJzHcW02rDYHgS2X2kjyXLs99tnNpww/r3MlWEkrKxgfgIRbtVQTJ2vNw mxIhJnAo/Ltu2VoEXU1WGwoMGv8wxquIuE1RBnYghnYPFd4SOMX8fXz5JylHpl+vPCWiP8U0 fFWfVL1vyldQG4aVtufaJ1VEOU8zsw6YeXzxWJJ7ppUag4teMKuFya69tEEN74KLkDMJRxGk pj7rHW8Y+xBdNW9hQ2vAXhWAtm64NtCtJcJYP8RNl/jqlqYTP1Voj7byXym9HUM7NGEbGtrw 4KKi9ws1yZv9BkW3ECBg5Q1w3WYmHfwqSa+8vrD2ahNieDYNu7veYP0oMaohumRgVhiaMscD IY8wqyt6K93RiwXDQjDAqwE44xrZDr4jjCUAm1D/7WYZWtzhsiDq80JasMbXd8SLKGr96zX5 6vJGxa6OvyavRO7Y7DGK/dNPWdZqAC4QlluibdRsbkFLtBg8d60sVxYW8A9o46rrQB8qzglc joPhDebr8/NsI0gnzjgpgmNbresqne4/JIylUuJEwYcOWZqKqDw9U03uTFk/Vp6AxmRquWpy XZJVBsMNbunclgSelZIt2nzCa2nXR5MYyV2Y8ays+gSAPeHFOc6a8JWNLhgVKUed12XVrMUQ bmMmTFWWqfrx89Up4a+jW7uGIzexOeXUXKeE1j0uGsRLk6CF7QARAQABzTRGbG9yaWFuIEhv ZmhhbW1lciAoRVBGTCkgPGZsb3JpYW4uaG9maGFtbWVyQGVwZmwuY2g+wsGUBBMBCAA+AhsD BQsJCAcCBhUKCQgLAgQWAgMBAh4BAheAFiEEqCB8P0q+u+2bTfhJlusnujFfx3wFAmfOq/AF CQ10kyEACgkQlusnujFfx3wl9Q//cNbHsBz6YvTzzi3fddVVYnEn7YBPMAw0r4vxtYpLCvpD sKOfMaGYYoV3AbVton2w53qTFcmTC/7J0/UxIi/cH1sWgVipZuVNrtESZFhkKAKpqJvHamPl uDD0kmINzztgNZOz44iUdGkSvqQW6ou5WpSEk9YEks4KPs/EH00l7hQ8YkfR/8oN63OxpYri W4+obeU45fBPPgOO1U1eMtWp/QBvo2qw+GiRQkq8kjKDTt9AYYPfcA+AdnhocgrQ2SdtcBuZ bb1BQnKEqWM2gVpvk/ujyZZktgBvqtoubAwaMpAGNgCoDju/zPf8wtbc/yo+AT+iiRQKuilm mQ7U0THfk3+DewN9CTZUiL1X6NdoUuLMqdSI4HCpo/d/N59wMkRKXHG2h/pKmTLbrHGFA4ZY a4zNN98yyPcq6OeAqurWbotXm7yxraXKkFD5dbBJcZYc5gJx+rZg2pIy+rYtQKqZWJTZhl2s ZrHNl1b8cEyS8vuiSZPjFnzgzVoBS1QE136ke/6P3rFPR4zPLyhZqKbCsGHR/BDfSCzeRwoE zJ3aV/8kmuyAfx1iTWVBLKJsPkiNS08jf+Nb+leo8Vab7AnolDTIr0o06bWas1AsIRG31/Zs wBRDlfjmKZ08f+B6a1SpkhdltGozljNt1PLEposY19aw5Ou3bqFQkYtooTfnZPnOwU0EXgiz 6wEQAM8iX+Y1mi1l3h876YmnuP8JSO1s6k0lABDO42pZaSp6Q9mFOabB7To80q1qEXCznlcR nExrN29WwXkfL2tcV4t/JFb0o4+6J9MmMUR3kdvRu55b/AGncNj0oggZDP8e5cLikv8v1ReV c//RPKSHVKnlmC9gtM0UHWpwHyyoplHi4sMJ8WyzGKfnN1eg7HlSx0xJAE7wKQP59mIMMj7n IXnk7bnGO7oaqy+i2vAxcdJPN6jvFgFCsKECL4NJCw6ifrY05paYRXza8JVwAcCzw0Sx4gZi JXC+gE4p80qNRrwR5AQuyLQNO9EfKLdnKg/85ag7xjB3ZWYMZNbj7HwCB+T16jOS+6lgGONf vctIp+hTFxXoCEnMx96FydDkqaBBjAU0JkbxhpMWFhzKzEILa60fxDxOSYHSs6h3bLk3D+gO i8j1SUPC4Olj9od7VIZDKGLd/nLw5qSt2c0H69cW1M/KS5zVARZQPb8Cqa9SAWdjmGw6MHvc WoYK4mT1arhwUlmrqUMcNqA+foGjDGPsxCQxqqIU2rB590n2wafu65UuyPUmzxOGdcb31I4E kkoBnM6G5nN4uZUCQPXl/DFlq/cfFI7LmIL2aZt6idehfvd+iOND4HDjRzrYDhz1FQn2Ihoi qHNMO4zSpWv35fl5kHfo1iYojwcd/aiyu4V8wo7TABEBAAHCwXwEGAEIACYCGwwWIQSoIHw/ Sr677ZtN+EmW6ye6MV/HfAUCZ86rzQUJC6crYgAKCRCW6ye6MV/HfK3jEACTixlDX+Xa53/f RS4AgdiLLcPnp63HYSe58cul/U8mGfcP8/wZXkPFzpsQZRONmj0vNHFAlTlQHpBnMmqxUvVx SosHPMrSwukjV/zDgTeYe8iZbqDjUEFIJvEU4mQd1O2/bfBCi0N0GuleN+oyu4cHhgJIN/Ym 3yJks/Aeprt4k3YwTZsGRCQ4fVyfmnHyYGLNKjtR/ubibG1I4hDVhf1IwrvsAcpHw1UKf/5+ ZA3O6ZANAwVG2iAidR2LhFPiBAFWtPmI0dX5i8+Hu5CmXlHkYK2TV8ys9zDuOEiWEcMR/9tA agcgw3orjj0lvFiSGYI9+w1NxO76T/by09nWsLXr8Mas+pFaKUP0Wk9vZjj+8TqPTkoKOMJS /+vsAGjFLM1ZfFyLRvVVJH4gaWs5zie533zYlArVA1db36+YGTBWzuHEawITPaLq/FngWb+e bxL9a5LkhEdTCnQVhBaC0yBbplRQcGwsc8IRK0sdWiRIGtlr6NMt1yw+3TwVsBPaYvLM/qfm pBZkz7hBNr2qTLcl1xeP4MMdMO2ubBUGTR5B+sOzaT1qIBe5XNFkhffLTR+YmkW1PXWz7tcO yQcudEYHvYhKegsw0Zjv8iQIQw3yeV0WbQAs+LGQAfwpVURhZgBk3DH9gQBFkZYi8YWX/zEc 5hMMZIzTI4AtIcgA3xe4Ew== In-Reply-To: <1739da2c-2ea6-4bc7-be6f-981f8658ce3f@epfl.ch> Content-Transfer-Encoding: quoted-printable X-ClientProxiedBy: GV0P278CA0090.CHEP278.PROD.OUTLOOK.COM (2603:10a6:710:2b::23) To ZRH2PFAD84B9AF9.CHEP278.PROD.OUTLOOK.COM (2603:10a6:918::220) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: ZRH2PFAD84B9AF9:EE_|GV0P278MB1029:EE_ X-MS-Office365-Filtering-Correlation-Id: ef2f6b18-8130-4360-15d3-08de78648595 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; ARA:13230040|376014|786006|366016|1800799024|19092799006; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:255.255.255.255; CTRY:; LANG:en; SCL:1; SRV:; IPV:NLI; SFV:NSPM; H:ZRH2PFAD84B9AF9.CHEP278.PROD.OUTLOOK.COM; PTR:; CAT:NONE; SFS:(13230040)(376014)(786006)(366016)(1800799024)(19092799006); DIR:OUT; SFP:1102; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?utf-8?B?RTBVQ2pBVGFhaStTQXplRkZNUmZqVUNUNzFINElYZHpQUEVNdjhEdTBDZHN4?= =?utf-8?B?V2k3M0FUeTVUV3lReU82Q1RXdUh5ZWh2L3lnZjJoQy95V29GbjV5ZnppcFA2?= =?utf-8?B?VnpkVHpkUUc0OXI0b283MjNvNGVGaWJhajJrUmtHeUJpZ3Y4T2duVTFYc0ZS?= =?utf-8?B?V0llZ3AwVlU1Qm5IVVJrRU1xWWI0dzNxYk0yZ21jcUVuN2QxMVNmUi9VUnl4?= =?utf-8?B?S1ZPbEdSN1FVL1I5L042VVlJRGNvT1l2eU4wdzd0SGlIREIxRjFoTThiWDRB?= =?utf-8?B?RGpsNE01ZzkzSkRrbXBDTGNOdmlHUko1MlpDempuWEFWZFFIaytTc1Z3RXFV?= =?utf-8?B?V3JHR3RkNFUvRm85NjRObUlZQ1lyWkJaY1cxNVhublR1OURmWW1Hd0V0d0Ew?= =?utf-8?B?V2YzdzRnVExKQXhodXFiZXFpeVJVVlViL0lLek9QTEllcDBvYjRNL2xYOGwy?= =?utf-8?B?aEtRL3dDdUszazRYaVl2aVc2UlA0SmNTQ0Q0WnZCd1dTT0RMRURnVExDRHZi?= =?utf-8?B?VC9KMnFxTTNIME5JcjZadGk0RkUwMjBqbldZMnBienpXNEwvWTlrb3RIMk1l?= =?utf-8?B?QWpEcElVMVp0SE5RMlVacFd1dHZUYmI2VVVYQVN6SVE1QTFwMmlJVHFlaE5T?= =?utf-8?B?cmlNRUh0S0U4VHhiM3JwT2RWV3YwUThSTTd4SWI5UWk3ZkJ6QUw5Wkl0ODFi?= =?utf-8?B?U2dld2pUaHY1THV0R1BraDJCVjRoc3NHM1dLRzk2ZWFXVEdMWTNDY2ROQ1Mx?= =?utf-8?B?WVp0aHNQZmxITWkweU1ud2NSeHVZK00wRS95cmgxVEhaRFl3SVRIUENjRlR6?= =?utf-8?B?MTMwSUgzczFoQitCWHROQWdZZ0VJZ1p6TEFzdDI4azBjcTZRMml1R1pib2xE?= =?utf-8?B?cmZNVi9JWXYyaHVsQ1pNNHNPUE1ub3NuTnFwODBqa25wMC9yZzJYa2NDaThY?= =?utf-8?B?ZjJwbFAyK3J3ajZnTnBhWGRYVnFKVDZPK0t3RmZZb0dHVmFnbjlWd3QxMWVj?= =?utf-8?B?TDR3VFhnc2lXM3l5NWdObkdBMGlHNkdFZ2s3N1VTd3ltbjU2SXBncXFpYUV4?= =?utf-8?B?dGhOek5YbVZPSlZpK3ovM0wyWThwa1dmSXlVNDJqck5SZXVWVmxBSXFVUTBi?= =?utf-8?B?VVNiU3NCN0tkTE5nK0d2bXdnSHZsOEhQaFBzY040cW10UkQ1NC9JbDdhTEFJ?= =?utf-8?B?VFJrZEVXa1hTbUZyQ3NJMmpZT24yZlZYSVdrczAwd25RY3Jzb1g0TVA0MlRW?= =?utf-8?B?em5wSTltL3A0akRsdmp5T3h2TVlWS254YmxJaDNhN3U1M3liT3FCNXR3WTZZ?= =?utf-8?B?RHdFeDBjMXNUdjNvRGxOTkpLUW9HbFlxRGZqY3Jvd2ppMmVlNjE4NzR4Ris4?= =?utf-8?B?WkQvOCtiYVBBNVBNRERpTG9FK24xalM4L1JRb2ExOXA4bUU1b3MwbmhOVHJP?= =?utf-8?B?eGZPak9JcTN2TWpWRWJGV2k2YnZ3UXRGbTZtQmNSOTlmelZVcXBXdURqUjFI?= =?utf-8?B?MDQzbnRVYnJSZUVJVUVYWldLL0pwVko2NC9jZzNnQk8wVjVMbzczWDBPK1Fz?= =?utf-8?B?WmZTWFV4QnRRYVJmSGlhL3VQQnJYMjlkNHBkN0w4aGRNcTZYSkhJQUZFZ2tW?= =?utf-8?B?RGZSa0hCaEdFU0ZITHFhMzB5akk3ZnhXZFpuVWpJbVNQUVNyT2J0TDhpeEZS?= =?utf-8?B?bkFKeDdNdE5lYnExM2FBSmUreThRbEpDWnBaaFZzcGl0b2hQOE8vMVlnbm9J?= =?utf-8?B?VW53M2M1U1FVL0JUSjk3QzdkSVFqeWMyclFjc21tZXRHZHE1ZWJyckxyRUpw?= =?utf-8?B?bVFRblFYK0JBTlJlVFo4RGVQeW9SYnlRdUI0bzAwdytkQlFvWlJSdW85Y2Jl?= =?utf-8?B?NGhMNFgyTEtMei94bmNPK1VBWUNCT1oxSnJ4TGJMYitEQm42TC9IYjdoQ1g0?= =?utf-8?B?K0g5RUh3VHg5T3ZBL0tWaUd1WndVVlhmbjRiMGMrejQ3ZFZRelFuWURTbUVK?= =?utf-8?B?TWpWdjhicHl5VG5PNEtPVGUvNGhFV1BPeHlLR1pxeHRhYXBmUENtblFqRTA0?= =?utf-8?B?a3BQZGd0c0xUbC8vbXJPTzJHYmp0Uy9QSmZLcGRZYjhQR1puL25vRngzWEhT?= =?utf-8?B?OWZvdmV2OFNRdGNjSlM4bjVpMFRPcTlocWtSQTNCTUIwY3g0SVBNTjFrcG55?= =?utf-8?B?VDY4b3R5cFNEV0dwL1I4WEZWbzVTYVVSYUNNaERVWXNQOG9PS012Q01WR1Qr?= =?utf-8?B?aWJJQUdGYnp5OEx2YzBrNm1iTU5JUG5ma0FJZ3JBblRIQWRQcnNWdmMwaVRj?= =?utf-8?B?R0IxSkV1amw0eFFiK1AzWHdLNC8zdHE4bVorZ2NidXRKY2Mvejl6Zz09?= X-OriginatorOrg: epfl.ch X-MS-Exchange-CrossTenant-Network-Message-Id: ef2f6b18-8130-4360-15d3-08de78648595 X-MS-Exchange-CrossTenant-AuthSource: ZRH2PFAD84B9AF9.CHEP278.PROD.OUTLOOK.COM X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 02 Mar 2026 14:03:46.7827 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: f6c2556a-c4fb-4ab1-a2c7-9e220df11c43 X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: Gqim9z0t6n1CH9zG2pbABmV2EKGc1EQWRtOv1QD4SbJSBHKxSVnerMTe4hVV6OQWyndBBYkkR9WQqHM1xGWdj3SqjA4/jzVABXrQhRs5wLQ= X-MS-Exchange-Transport-CrossTenantHeadersStamped: GV0P278MB1029 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=2a01:111:f403:c214::1; envelope-from=florian.hofhammer@epfl.ch; helo=GVAP278CU002.outbound.protection.outlook.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, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 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: qemu development 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 @epfl.ch) X-ZM-MESSAGEID: 1772460360485158500 Content-Type: text/plain; charset="utf-8" The syscall emulation code previously wasn't interruptible via cpu_loop_exit(), as this construct relies on a longjmp target that is not live anymore in the syscall handling code. Consequently, longjmp() would operate on a (potentially overwritten) stale jump buffer. This patch adds a= n additional setjmp and the necessary handling around it to make longjmp() (and by proxy cpu_loop_exit() safe to call even within a syscall context. Signed-off-by: Florian Hofhammer Reviewed-by: Warner Losh --- linux-user/aarch64/cpu_loop.c | 2 +- linux-user/alpha/cpu_loop.c | 2 +- linux-user/arm/cpu_loop.c | 2 +- linux-user/hexagon/cpu_loop.c | 2 +- linux-user/hppa/cpu_loop.c | 1 + linux-user/i386/cpu_loop.c | 8 +++++--- linux-user/include/special-errno.h | 8 ++++++++ linux-user/loongarch64/cpu_loop.c | 5 +++-- linux-user/m68k/cpu_loop.c | 2 +- linux-user/microblaze/cpu_loop.c | 2 +- linux-user/mips/cpu_loop.c | 9 ++++++--- linux-user/or1k/cpu_loop.c | 2 +- linux-user/ppc/cpu_loop.c | 10 +++++++--- linux-user/riscv/cpu_loop.c | 2 +- linux-user/s390x/cpu_loop.c | 2 +- linux-user/sh4/cpu_loop.c | 2 +- linux-user/sparc/cpu_loop.c | 4 +++- linux-user/syscall.c | 16 ++++++++++++++++ linux-user/xtensa/cpu_loop.c | 1 + 19 files changed, 60 insertions(+), 22 deletions(-) diff --git a/linux-user/aarch64/cpu_loop.c b/linux-user/aarch64/cpu_loop.c index 7f66a879ea..e7f643d69d 100644 --- a/linux-user/aarch64/cpu_loop.c +++ b/linux-user/aarch64/cpu_loop.c @@ -181,7 +181,7 @@ void cpu_loop(CPUARMState *env) 0, 0); if (ret =3D=3D -QEMU_ERESTARTSYS) { env->pc -=3D 4; - } else if (ret !=3D -QEMU_ESIGRETURN) { + } else if (ret !=3D -QEMU_ESIGRETURN && ret !=3D -QEMU_ESETPC)= { env->xregs[0] =3D ret; } break; diff --git a/linux-user/alpha/cpu_loop.c b/linux-user/alpha/cpu_loop.c index f93597c400..bef196b1f5 100644 --- a/linux-user/alpha/cpu_loop.c +++ b/linux-user/alpha/cpu_loop.c @@ -82,7 +82,7 @@ void cpu_loop(CPUAlphaState *env) env->pc -=3D 4; break; } - if (sysret =3D=3D -QEMU_ESIGRETURN) { + if (sysret =3D=3D -QEMU_ESIGRETURN || sysret =3D=3D -QEMU_= ESETPC) { break; } /* Syscall writes 0 to V0 to bypass error check, similar diff --git a/linux-user/arm/cpu_loop.c b/linux-user/arm/cpu_loop.c index 40aefc4c1d..19874f4c72 100644 --- a/linux-user/arm/cpu_loop.c +++ b/linux-user/arm/cpu_loop.c @@ -399,7 +399,7 @@ void cpu_loop(CPUARMState *env) 0, 0); if (ret =3D=3D -QEMU_ERESTARTSYS) { env->regs[15] -=3D env->thumb ? 2 : 4; - } else if (ret !=3D -QEMU_ESIGRETURN) { + } else if (ret !=3D -QEMU_ESIGRETURN && ret !=3D -QEMU= _ESETPC) { env->regs[0] =3D ret; } } diff --git a/linux-user/hexagon/cpu_loop.c b/linux-user/hexagon/cpu_loop.c index 5711055aff..9464246e9e 100644 --- a/linux-user/hexagon/cpu_loop.c +++ b/linux-user/hexagon/cpu_loop.c @@ -56,7 +56,7 @@ void cpu_loop(CPUHexagonState *env) 0, 0); if (ret =3D=3D -QEMU_ERESTARTSYS) { env->gpr[HEX_REG_PC] -=3D 4; - } else if (ret !=3D -QEMU_ESIGRETURN) { + } else if (ret !=3D -QEMU_ESIGRETURN && ret !=3D -QEMU_ESETPC)= { env->gpr[0] =3D ret; } break; diff --git a/linux-user/hppa/cpu_loop.c b/linux-user/hppa/cpu_loop.c index 972e85c487..4b4b663052 100644 --- a/linux-user/hppa/cpu_loop.c +++ b/linux-user/hppa/cpu_loop.c @@ -124,6 +124,7 @@ void cpu_loop(CPUHPPAState *env) break; case -QEMU_ERESTARTSYS: case -QEMU_ESIGRETURN: + case -QEMU_ESETPC: break; } break; diff --git a/linux-user/i386/cpu_loop.c b/linux-user/i386/cpu_loop.c index f3f58576af..fe922fceb5 100644 --- a/linux-user/i386/cpu_loop.c +++ b/linux-user/i386/cpu_loop.c @@ -181,7 +181,9 @@ static void emulate_vsyscall(CPUX86State *env) if (ret =3D=3D -TARGET_EFAULT) { goto sigsegv; } - env->regs[R_EAX] =3D ret; + if (ret !=3D -QEMU_ESETPC) { + env->regs[R_EAX] =3D ret; + } =20 /* Emulate a ret instruction to leave the vsyscall page. */ env->eip =3D caller; @@ -234,7 +236,7 @@ void cpu_loop(CPUX86State *env) 0, 0); if (ret =3D=3D -QEMU_ERESTARTSYS) { env->eip -=3D 2; - } else if (ret !=3D -QEMU_ESIGRETURN) { + } else if (ret !=3D -QEMU_ESIGRETURN && ret !=3D -QEMU_ESETPC)= { env->regs[R_EAX] =3D ret; } break; @@ -253,7 +255,7 @@ void cpu_loop(CPUX86State *env) 0, 0); if (ret =3D=3D -QEMU_ERESTARTSYS) { env->eip -=3D 2; - } else if (ret !=3D -QEMU_ESIGRETURN) { + } else if (ret !=3D -QEMU_ESIGRETURN && ret !=3D -QEMU_ESETPC)= { env->regs[R_EAX] =3D ret; } break; diff --git a/linux-user/include/special-errno.h b/linux-user/include/specia= l-errno.h index 4120455baa..1db757241a 100644 --- a/linux-user/include/special-errno.h +++ b/linux-user/include/special-errno.h @@ -29,4 +29,12 @@ */ #define QEMU_ESIGRETURN 513 =20 +/* + * This is returned after a plugin has used the qemu_plugin_set_pc API, to + * indicate that the plugin deliberately changed the PC and potentially + * modified the register values. The main loop should not touch the guest + * registers for this reason. + */ +#define QEMU_ESETPC 514 + #endif /* SPECIAL_ERRNO_H */ diff --git a/linux-user/loongarch64/cpu_loop.c b/linux-user/loongarch64/cpu= _loop.c index 26a5ce3a93..603fcc39c7 100644 --- a/linux-user/loongarch64/cpu_loop.c +++ b/linux-user/loongarch64/cpu_loop.c @@ -44,9 +44,10 @@ void cpu_loop(CPULoongArchState *env) env->pc -=3D 4; break; } - if (ret =3D=3D -QEMU_ESIGRETURN) { + if (ret =3D=3D -QEMU_ESIGRETURN || ret =3D=3D -QEMU_ESETPC) { /* - * Returning from a successful sigreturn syscall. + * Returning from a successful sigreturn syscall or from + * control flow diversion in a plugin callback. * Avoid clobbering register state. */ break; diff --git a/linux-user/m68k/cpu_loop.c b/linux-user/m68k/cpu_loop.c index 2c9f628241..b98ca8ff7b 100644 --- a/linux-user/m68k/cpu_loop.c +++ b/linux-user/m68k/cpu_loop.c @@ -66,7 +66,7 @@ void cpu_loop(CPUM68KState *env) 0, 0); if (ret =3D=3D -QEMU_ERESTARTSYS) { env->pc -=3D 2; - } else if (ret !=3D -QEMU_ESIGRETURN) { + } else if (ret !=3D -QEMU_ESIGRETURN && ret !=3D -QEMU_ESE= TPC) { env->dregs[0] =3D ret; } } diff --git a/linux-user/microblaze/cpu_loop.c b/linux-user/microblaze/cpu_l= oop.c index 78506ab23d..06d92c0b90 100644 --- a/linux-user/microblaze/cpu_loop.c +++ b/linux-user/microblaze/cpu_loop.c @@ -54,7 +54,7 @@ void cpu_loop(CPUMBState *env) if (ret =3D=3D -QEMU_ERESTARTSYS) { /* Wind back to before the syscall. */ env->pc -=3D 4; - } else if (ret !=3D -QEMU_ESIGRETURN) { + } else if (ret !=3D -QEMU_ESIGRETURN && ret !=3D -QEMU_ESETPC)= { env->regs[3] =3D ret; } /* All syscall exits result in guest r14 being equal to the diff --git a/linux-user/mips/cpu_loop.c b/linux-user/mips/cpu_loop.c index 2365de1de1..fa264b27ec 100644 --- a/linux-user/mips/cpu_loop.c +++ b/linux-user/mips/cpu_loop.c @@ -140,9 +140,12 @@ done_syscall: env->active_tc.PC -=3D 4; break; } - if (ret =3D=3D -QEMU_ESIGRETURN) { - /* Returning from a successful sigreturn syscall. - Avoid clobbering register state. */ + if (ret =3D=3D -QEMU_ESIGRETURN || ret =3D=3D -QEMU_ESETPC) { + /* + * Returning from a successful sigreturn syscall or from + * control flow diversion in a plugin callback. + * Avoid clobbering register state. + */ break; } if ((abi_ulong)ret >=3D (abi_ulong)-1133) { diff --git a/linux-user/or1k/cpu_loop.c b/linux-user/or1k/cpu_loop.c index 2167d880d5..e7e9929e6f 100644 --- a/linux-user/or1k/cpu_loop.c +++ b/linux-user/or1k/cpu_loop.c @@ -48,7 +48,7 @@ void cpu_loop(CPUOpenRISCState *env) cpu_get_gpr(env, 8), 0, 0); if (ret =3D=3D -QEMU_ERESTARTSYS) { env->pc -=3D 4; - } else if (ret !=3D -QEMU_ESIGRETURN) { + } else if (ret !=3D -QEMU_ESIGRETURN && ret !=3D -QEMU_ESETPC)= { cpu_set_gpr(env, 11, ret); } break; diff --git a/linux-user/ppc/cpu_loop.c b/linux-user/ppc/cpu_loop.c index b0b0cb14b4..1f9ee20bd0 100644 --- a/linux-user/ppc/cpu_loop.c +++ b/linux-user/ppc/cpu_loop.c @@ -340,9 +340,13 @@ void cpu_loop(CPUPPCState *env) env->nip -=3D 4; break; } - if (ret =3D=3D (target_ulong)(-QEMU_ESIGRETURN)) { - /* Returning from a successful sigreturn syscall. - Avoid corrupting register state. */ + if (ret =3D=3D (target_ulong)(-QEMU_ESIGRETURN) || + ret =3D=3D (target_ulong)(-QEMU_ESETPC)) { + /* + * Returning from a successful sigreturn syscall or from + * control flow diversion in a plugin callback. + * Avoid corrupting register state. + */ break; } if (ret > (target_ulong)(-515)) { diff --git a/linux-user/riscv/cpu_loop.c b/linux-user/riscv/cpu_loop.c index ce542540c2..eecc8d1517 100644 --- a/linux-user/riscv/cpu_loop.c +++ b/linux-user/riscv/cpu_loop.c @@ -65,7 +65,7 @@ void cpu_loop(CPURISCVState *env) } if (ret =3D=3D -QEMU_ERESTARTSYS) { env->pc -=3D 4; - } else if (ret !=3D -QEMU_ESIGRETURN) { + } else if (ret !=3D -QEMU_ESIGRETURN && ret !=3D -QEMU_ESETPC)= { env->gpr[xA0] =3D ret; } if (cs->singlestep_enabled) { diff --git a/linux-user/s390x/cpu_loop.c b/linux-user/s390x/cpu_loop.c index 4929b32e1f..67d2a803fb 100644 --- a/linux-user/s390x/cpu_loop.c +++ b/linux-user/s390x/cpu_loop.c @@ -83,7 +83,7 @@ void cpu_loop(CPUS390XState *env) env->regs[6], env->regs[7], 0, 0); if (ret =3D=3D -QEMU_ERESTARTSYS) { env->psw.addr -=3D env->int_svc_ilen; - } else if (ret !=3D -QEMU_ESIGRETURN) { + } else if (ret !=3D -QEMU_ESIGRETURN && ret !=3D -QEMU_ESETPC)= { env->regs[2] =3D ret; } =20 diff --git a/linux-user/sh4/cpu_loop.c b/linux-user/sh4/cpu_loop.c index 0c9d7e9c46..ee2958d0d9 100644 --- a/linux-user/sh4/cpu_loop.c +++ b/linux-user/sh4/cpu_loop.c @@ -50,7 +50,7 @@ void cpu_loop(CPUSH4State *env) 0, 0); if (ret =3D=3D -QEMU_ERESTARTSYS) { env->pc -=3D 2; - } else if (ret !=3D -QEMU_ESIGRETURN) { + } else if (ret !=3D -QEMU_ESIGRETURN && ret !=3D -QEMU_ESETPC)= { env->gregs[0] =3D ret; } break; diff --git a/linux-user/sparc/cpu_loop.c b/linux-user/sparc/cpu_loop.c index 7391e2add8..ab633eeae3 100644 --- a/linux-user/sparc/cpu_loop.c +++ b/linux-user/sparc/cpu_loop.c @@ -229,7 +229,9 @@ void cpu_loop (CPUSPARCState *env) env->regwptr[2], env->regwptr[3], env->regwptr[4], env->regwptr[5], 0, 0); - if (ret =3D=3D -QEMU_ERESTARTSYS || ret =3D=3D -QEMU_ESIGRETUR= N) { + if (ret =3D=3D -QEMU_ERESTARTSYS || + ret =3D=3D -QEMU_ESIGRETURN || + ret =3D=3D -QEMU_ESETPC) { break; } if ((abi_ulong)ret >=3D (abi_ulong)(-515)) { diff --git a/linux-user/syscall.c b/linux-user/syscall.c index d466d0e32f..99e1ed97d9 100644 --- a/linux-user/syscall.c +++ b/linux-user/syscall.c @@ -43,6 +43,7 @@ #include #include #include +#include #include #include #include @@ -600,6 +601,9 @@ const char *target_strerror(int err) if (err =3D=3D QEMU_ESIGRETURN) { return "Successful exit from sigreturn"; } + if (err =3D=3D QEMU_ESETPC) { + return "Successfully redirected control flow"; + } =20 return strerror(target_to_host_errno(err)); } @@ -14410,6 +14414,18 @@ abi_long do_syscall(CPUArchState *cpu_env, int num= , abi_long arg1, return -QEMU_ESIGRETURN; } =20 + /* + * Set up a longjmp target here so that we can call cpu_loop_exit to + * redirect control flow back to the main loop even from within + * syscall-related plugin callbacks. + * For other types of callbacks or longjmp call sites, the longjmp tar= get + * is set up in the cpu loop itself but in syscalls the target is not = live + * anymore. + */ + if (unlikely(sigsetjmp(cpu->jmp_env, 0) !=3D 0)) { + return -QEMU_ESETPC; + } + record_syscall_start(cpu, num, arg1, arg2, arg3, arg4, arg5, arg6, arg7, arg8); =20 diff --git a/linux-user/xtensa/cpu_loop.c b/linux-user/xtensa/cpu_loop.c index a0ff10eff8..d2b4ccdfad 100644 --- a/linux-user/xtensa/cpu_loop.c +++ b/linux-user/xtensa/cpu_loop.c @@ -186,6 +186,7 @@ void cpu_loop(CPUXtensaState *env) break; =20 case -QEMU_ESIGRETURN: + case -QEMU_ESETPC: break; } break; --=20 2.53.0