Message ID | 20210825134232.45074-2-alxndr@bu.edu (mailing list archive) |
---|---|
State | New, archived |
Headers | show
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Wed, 25 Aug 2021 13:42:48 +0000 From: Alexander Bulekov <alxndr@bu.edu> To: Paolo Bonzini <pbonzini@redhat.com>, qemu-devel@nongnu.org Subject: [PULL v2 1/8] fuzz: fix sparse memory access in the DMA callback Date: Wed, 25 Aug 2021 09:42:25 -0400 Message-Id: <20210825134232.45074-2-alxndr@bu.edu> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210825134232.45074-1-alxndr@bu.edu> References: <20210825134232.45074-1-alxndr@bu.edu> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-ClientProxiedBy: MN2PR15CA0016.namprd15.prod.outlook.com (2603:10b6:208:1b4::29) To SN6PR03MB3871.namprd03.prod.outlook.com (2603:10b6:805:6d::32) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from stormtrooper.vrmnet (72.74.210.193) by MN2PR15CA0016.namprd15.prod.outlook.com (2603:10b6:208:1b4::29) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4457.17 via Frontend Transport; Wed, 25 Aug 2021 13:42:47 +0000 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: f3775174-5745-4faf-7099-08d967ce39a4 X-MS-TrafficTypeDiagnostic: SN6PR03MB4446: X-MS-Exchange-Transport-Forked: True X-Microsoft-Antispam-PRVS: <SN6PR03MB44460E12929752AD124FAA0CBAC69@SN6PR03MB4446.namprd03.prod.outlook.com> X-MS-Oob-TLC-OOBClassifiers: OLM:7691; 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Series |
[PULL,v2,1/8] fuzz: fix sparse memory access in the DMA callback
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diff --git a/tests/qtest/fuzz/generic_fuzz.c b/tests/qtest/fuzz/generic_fuzz.c index 6c67522717..0ea47298b7 100644 --- a/tests/qtest/fuzz/generic_fuzz.c +++ b/tests/qtest/fuzz/generic_fuzz.c @@ -240,10 +240,17 @@ void fuzz_dma_read_cb(size_t addr, size_t len, MemoryRegion *mr) addr, &addr1, &l, true, MEMTXATTRS_UNSPECIFIED); - if (!(memory_region_is_ram(mr1) || - memory_region_is_romd(mr1)) && mr1 != sparse_mem_mr) { + /* + * If mr1 isn't RAM, address_space_translate doesn't update l. Use + * memory_access_size to identify the number of bytes that it is safe + * to write without accidentally writing to another MemoryRegion. + */ + if (!memory_region_is_ram(mr1)) { l = memory_access_size(mr1, l, addr1); - } else { + } + if (memory_region_is_ram(mr1) || + memory_region_is_romd(mr1) || + mr1 == sparse_mem_mr) { /* ROM/RAM case */ if (qtest_log_enabled) { /*