From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-12.3 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,HK_RANDOM_FROM,INCLUDES_PATCH, MAILING_LIST_MULTI,MSGID_FROM_MTA_HEADER,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 79811C4363A for ; Wed, 21 Oct 2020 21:12:36 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id A451024197 for ; Wed, 21 Oct 2020 21:12:35 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=bushare.onmicrosoft.com header.i=@bushare.onmicrosoft.com header.b="cFYohg0d" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org A451024197 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=bu.edu Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:41790 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1kVLPM-00055t-Ro for qemu-devel@archiver.kernel.org; Wed, 21 Oct 2020 17:12:34 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:42866) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kVLMg-0003C5-5B for qemu-devel@nongnu.org; Wed, 21 Oct 2020 17:09:46 -0400 Received: from mail-dm6nam11on2104.outbound.protection.outlook.com ([40.107.223.104]:14145 helo=NAM11-DM6-obe.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 1kVLMd-00083s-NI for qemu-devel@nongnu.org; Wed, 21 Oct 2020 17:09:45 -0400 ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=ZFx4yEj7NJzNH5WNp35xMALnLQ8LncCXTG2qHEru0gvFz4Fd9434/OEuArKf0atXiHFV1bL3gbjaGhjILqCHgNFpdMZt5g9piOZcxp2jQHgB4GHm+VZXn9FSy5yn3scIp7IHGEnNDiVI4wNbztRS3aT4eaiv6BIuAeC1oIsHxEJodP6qLo7YlpAgPp4XEqkNfWfL8R7l6SP4iJdkMozu+RRrj7SCdEDb7XrLPffhB//TfZcmhNsIjDQ0N2Ktb0qyXkkfP0Be46jdiE9Bsctd9sDec/3MWXTpOOi8MvlT01Mqs2bV8KD1Y4R9A3c7ieGN/Ly9Qi87d2ci48PaNj8YKA== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector9901; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=bkqGWl72/AdS8gHMBdKtj4gIFDb8FixmA4rFdZf204Q=; b=FNKpg4Rq/BOBqhoTl9P7CAKVIeGz5ZhkzdvcBJUZRm6Q+HkZo9tUv+9mZHmtgCIp3Z2lryoejkLNjUOtH+/JIypntMummms+IBXQgWZhCiSbSk+uTxph80CdqB2zD+rZoMcoWStu8049pPLrwfNRwcMdH6EdgpucPG1+K9ToyuGobAFOT9dOnyMW/m+XB3AJXIvFrU4hoyIld4Uf6awpUeKjSXCULJUkld3GWTvwexdie0StWq9HHXouMYEPfmxkK9oDungxYtlM9GuwXvuqC5pYmv/chTWf1b5lqYXto9tvvVEA2wbvoaLiBL2X8ZmFh/ll7ZloJD2QT2LF9s0rPA== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=bu.edu; dmarc=pass action=none header.from=bu.edu; dkim=pass header.d=bu.edu; arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bushare.onmicrosoft.com; s=selector2-bushare-onmicrosoft-com; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=bkqGWl72/AdS8gHMBdKtj4gIFDb8FixmA4rFdZf204Q=; b=cFYohg0dgvVIUTq4/r25LvGipHWxnrYrxqs/7Tw+p0d959UU8rc0HKg6EejY3igQvSaolprELk7Z88gOcEk2mtWXKf/+w9GfyENsqqWoLmrs7iY3QdNtjt4dpctq6ni8ANBlu/tdvSDgm4trs8EuYPoIAjbh15VGRUAjn6OpVlI= Authentication-Results: nongnu.org; dkim=none (message not signed) header.d=none;nongnu.org; dmarc=none action=none header.from=bu.edu; Received: from SN6PR03MB3871.namprd03.prod.outlook.com (2603:10b6:805:6d::32) by SN6PR03MB3805.namprd03.prod.outlook.com (2603:10b6:805:76::13) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3477.28; Wed, 21 Oct 2020 21:09:40 +0000 Received: from SN6PR03MB3871.namprd03.prod.outlook.com ([fe80::d520:4c19:8ce6:7db2]) by SN6PR03MB3871.namprd03.prod.outlook.com ([fe80::d520:4c19:8ce6:7db2%2]) with mapi id 15.20.3477.028; Wed, 21 Oct 2020 21:09:40 +0000 From: Alexander Bulekov To: qemu-devel@nongnu.org Subject: [PATCH v6 04/16] fuzz: Add DMA support to the generic-fuzzer Date: Wed, 21 Oct 2020 17:09:10 -0400 Message-Id: <20201021210922.572955-5-alxndr@bu.edu> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20201021210922.572955-1-alxndr@bu.edu> References: <20201021210922.572955-1-alxndr@bu.edu> Content-Transfer-Encoding: 8bit Content-Type: text/plain X-Originating-IP: [72.93.72.163] X-ClientProxiedBy: BL0PR0102CA0064.prod.exchangelabs.com (2603:10b6:208:25::41) To SN6PR03MB3871.namprd03.prod.outlook.com (2603:10b6:805:6d::32) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from stormtrooper.vrmnet (72.93.72.163) by BL0PR0102CA0064.prod.exchangelabs.com (2603:10b6:208:25::41) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3499.18 via Frontend Transport; Wed, 21 Oct 2020 21:09:39 +0000 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 093ff0c8-8446-4a68-c397-08d876059fd3 X-MS-TrafficTypeDiagnostic: SN6PR03MB3805: X-MS-Exchange-Transport-Forked: True X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:34; X-MS-Exchange-SenderADCheck: 1 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: bPXyDJBMbljJ+nTw6kWqM4b8pFMhHfVQxRzyO3h6MuA3DpJzrnen26JCtKIDamZwZYdNkpaO7i9Pt8qQSvXCAB0Yyoo2MZhbAhuGer6ZRWA0gKs7HP6YfeIICrbWryeImAQ/4VwlWRG8NAUplHmip3AKhe8FQBYo5XGu62XPAD9Gh3mvwvT230RjuAmaCzZUrDw1Gqkl8vN2QY4gLMffi5PICI58XHDyL01dwSrCkLlwYySXaQ4m+9GIne3VfmO57AcEWQk4W5IWl/2u899ERy8C7OJzvgZpqV6O1NF34qhyIc0myWnznOBnyhbuT0mh1/HG34ahhDhs7lNVlps3JCkexsThOpxfWC50mTJOfP11Qrp5kvVJMPWmth18jcWI X-Forefront-Antispam-Report: CIP:255.255.255.255; CTRY:; LANG:en; SCL:1; SRV:; IPV:NLI; SFV:NSPM; H:SN6PR03MB3871.namprd03.prod.outlook.com; PTR:; CAT:NONE; SFS:(4636009)(136003)(366004)(396003)(346002)(376002)(39860400002)(66556008)(30864003)(956004)(2616005)(54906003)(786003)(6512007)(66946007)(316002)(66476007)(5660300002)(75432002)(1076003)(86362001)(8936002)(36756003)(6916009)(8676002)(4326008)(6666004)(16526019)(26005)(6506007)(52116002)(6486002)(83380400001)(2906002)(478600001)(186003)(41533002); DIR:OUT; SFP:1102; X-MS-Exchange-AntiSpam-MessageData: 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 X-OriginatorOrg: bu.edu X-MS-Exchange-CrossTenant-Network-Message-Id: 093ff0c8-8446-4a68-c397-08d876059fd3 X-MS-Exchange-CrossTenant-AuthSource: SN6PR03MB3871.namprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 21 Oct 2020 21:09:40.3933 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: d57d32cc-c121-488f-b07b-dfe705680c71 X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: rWaJiakUJgNWg+gSBwOpEHHHlpINqsrnuhItAl8qoMusmuElEDhotZ2beaA/XJ62 X-MS-Exchange-Transport-CrossTenantHeadersStamped: SN6PR03MB3805 Received-SPF: pass client-ip=40.107.223.104; envelope-from=alxndr@bu.edu; helo=NAM11-DM6-obe.outbound.protection.outlook.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/10/21 17:09:42 X-ACL-Warn: Detected OS = Windows NT kernel [generic] [fuzzy] X-Spam_score_int: -13 X-Spam_score: -1.4 X-Spam_bar: - X-Spam_report: (-1.4 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, HK_RANDOM_ENVFROM=0.001, HK_RANDOM_FROM=0.454, MSGID_FROM_MTA_HEADER=0.001, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H2=-0.001, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001 autolearn=no autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Laurent Vivier , Thomas Huth , Alexander Bulekov , f4bug@amsat.org, darren.kenny@oracle.com, bsd@redhat.com, stefanha@redhat.com, pbonzini@redhat.com, dimastep@yandex-team.ru Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" When a virtual-device tries to access some buffer in memory over DMA, we add call-backs into the fuzzer(next commit). The fuzzer checks verifies that the DMA request maps to a physical RAM address and fills the memory with fuzzer-provided data. The patterns that we use to fill this memory are specified using add_dma_pattern and clear_dma_patterns operations. Signed-off-by: Alexander Bulekov Reviewed-by: Darren Kenny --- include/exec/memory.h | 7 + tests/qtest/fuzz/generic_fuzz.c | 228 ++++++++++++++++++++++++++++++++ 2 files changed, 235 insertions(+) diff --git a/include/exec/memory.h b/include/exec/memory.h index 042918dd16..93d27bff26 100644 --- a/include/exec/memory.h +++ b/include/exec/memory.h @@ -42,6 +42,13 @@ typedef struct IOMMUMemoryRegionClass IOMMUMemoryRegionClass; DECLARE_OBJ_CHECKERS(IOMMUMemoryRegion, IOMMUMemoryRegionClass, IOMMU_MEMORY_REGION, TYPE_IOMMU_MEMORY_REGION) +#ifdef CONFIG_FUZZ +void fuzz_dma_read_cb(size_t addr, + size_t len, + MemoryRegion *mr, + bool is_write); +#endif + extern bool global_dirty_log; typedef struct MemoryRegionOps MemoryRegionOps; diff --git a/tests/qtest/fuzz/generic_fuzz.c b/tests/qtest/fuzz/generic_fuzz.c index 4ab28c2ec7..e356873ae0 100644 --- a/tests/qtest/fuzz/generic_fuzz.c +++ b/tests/qtest/fuzz/generic_fuzz.c @@ -25,6 +25,7 @@ #include "exec/address-spaces.h" #include "hw/qdev-core.h" #include "hw/pci/pci.h" +#include "hw/boards.h" /* * SEPARATOR is used to separate "operations" in the fuzz input @@ -38,12 +39,16 @@ enum cmds { OP_WRITE, OP_PCI_READ, OP_PCI_WRITE, + OP_ADD_DMA_PATTERN, + OP_CLEAR_DMA_PATTERNS, OP_CLOCK_STEP, }; #define DEFAULT_TIMEOUT_US 100000 #define USEC_IN_SEC 1000000000 +#define MAX_DMA_FILL_SIZE 0x10000 + #define PCI_HOST_BRIDGE_CFG 0xcf8 #define PCI_HOST_BRIDGE_DATA 0xcfc @@ -56,6 +61,24 @@ static useconds_t timeout = DEFAULT_TIMEOUT_US; static bool qtest_log_enabled; +/* + * A pattern used to populate a DMA region or perform a memwrite. This is + * useful for e.g. populating tables of unique addresses. + * Example {.index = 1; .stride = 2; .len = 3; .data = "\x00\x01\x02"} + * Renders as: 00 01 02 00 03 02 00 05 02 00 07 02 ... + */ +typedef struct { + uint8_t index; /* Index of a byte to increment by stride */ + uint8_t stride; /* Increment each index'th byte by this amount */ + size_t len; + const uint8_t *data; +} pattern; + +/* Avoid filling the same DMA region between MMIO/PIO commands ? */ +static bool avoid_double_fetches; + +static QTestState *qts_global; /* Need a global for the DMA callback */ + /* * List of memory regions that are children of QOM objects specified by the * user for fuzzing. @@ -84,6 +107,167 @@ static int get_io_address_cb(Int128 start, Int128 size, return 0; } +/* + * List of dma regions populated since the last fuzzing command. Used to ensure + * that we only write to each DMA address once, to avoid race conditions when + * building reproducers. + */ +static GArray *dma_regions; + +static GArray *dma_patterns; +static int dma_pattern_index; + +/* + * Allocate a block of memory and populate it with a pattern. + */ +static void *pattern_alloc(pattern p, size_t len) +{ + int i; + uint8_t *buf = g_malloc(len); + uint8_t sum = 0; + + for (i = 0; i < len; ++i) { + buf[i] = p.data[i % p.len]; + if ((i % p.len) == p.index) { + buf[i] += sum; + sum += p.stride; + } + } + return buf; +} + +static int memory_access_size(MemoryRegion *mr, unsigned l, hwaddr addr) +{ + unsigned access_size_max = mr->ops->valid.max_access_size; + + /* Regions are assumed to support 1-4 byte accesses unless + otherwise specified. */ + if (access_size_max == 0) { + access_size_max = 4; + } + + /* Bound the maximum access by the alignment of the address. */ + if (!mr->ops->impl.unaligned) { + unsigned align_size_max = addr & -addr; + if (align_size_max != 0 && align_size_max < access_size_max) { + access_size_max = align_size_max; + } + } + + /* Don't attempt accesses larger than the maximum. */ + if (l > access_size_max) { + l = access_size_max; + } + l = pow2floor(l); + + return l; +} + +/* + * Call-back for functions that perform DMA reads from guest memory. Confirm + * that the region has not already been populated since the last loop in + * generic_fuzz(), avoiding potential race-conditions, which we don't have + * a good way for reproducing right now. + */ +void fuzz_dma_read_cb(size_t addr, size_t len, MemoryRegion *mr, bool is_write) +{ + /* Are we in the generic-fuzzer or are we using another fuzz-target? */ + if (!qts_global) { + return; + } + + /* + * Return immediately if: + * - We have no DMA patterns defined + * - The length of the DMA read request is zero + * - The DMA read is hitting an MR other than the machine's main RAM + * - The DMA request is not a read (what happens for a address_space_map + * with is_write=True? Can the device use the same pointer to do reads?) + * - The DMA request hits past the bounds of our RAM + */ + if (dma_patterns->len == 0 + || len == 0 + /* || mr != MACHINE(qdev_get_machine())->ram */ + || is_write + || addr > current_machine->ram_size) { + return; + } + + /* + * If we overlap with any existing dma_regions, split the range and only + * populate the non-overlapping parts. + */ + address_range region; + bool double_fetch = false; + for (int i = 0; + i < dma_regions->len && (avoid_double_fetches || qtest_log_enabled); + ++i) { + region = g_array_index(dma_regions, address_range, i); + if (addr < region.addr + region.size && addr + len > region.addr) { + double_fetch = true; + if (addr < region.addr + && avoid_double_fetches) { + fuzz_dma_read_cb(addr, region.addr - addr, mr, is_write); + } + if (addr + len > region.addr + region.size + && avoid_double_fetches) { + fuzz_dma_read_cb(region.addr + region.size, + addr + len - (region.addr + region.size), mr, is_write); + } + return; + } + } + + /* Cap the length of the DMA access to something reasonable */ + len = MIN(len, MAX_DMA_FILL_SIZE); + + address_range ar = {addr, len}; + g_array_append_val(dma_regions, ar); + pattern p = g_array_index(dma_patterns, pattern, dma_pattern_index); + void *buf = pattern_alloc(p, ar.size); + hwaddr l, addr1; + MemoryRegion *mr1; + uint8_t *ram_ptr; + while (len > 0) { + l = len; + mr1 = address_space_translate(first_cpu->as, + addr, &addr1, &l, true, + MEMTXATTRS_UNSPECIFIED); + + if (!(memory_region_is_ram(mr1) || + memory_region_is_romd(mr1))) { + l = memory_access_size(mr1, l, addr1); + } else { + /* ROM/RAM case */ + ram_ptr = qemu_map_ram_ptr(mr1->ram_block, addr1); + memcpy(ram_ptr, buf, l); + break; + } + len -= l; + buf += l; + addr += l; + + } + if (qtest_log_enabled) { + /* + * With QTEST_LOG, use a normal, slow QTest memwrite. Prefix the log + * that will be written by qtest.c with a DMA tag, so we can reorder + * the resulting QTest trace so the DMA fills precede the last PIO/MMIO + * command. + */ + fprintf(stderr, "[DMA] "); + if (double_fetch) { + fprintf(stderr, "[DOUBLE-FETCH] "); + } + fflush(stderr); + } + qtest_memwrite(qts_global, ar.addr, buf, ar.size); + g_free(buf); + + /* Increment the index of the pattern for the next DMA access */ + dma_pattern_index = (dma_pattern_index + 1) % dma_patterns->len; +} + /* * Here we want to convert a fuzzer-provided [io-region-index, offset] to * a physical address. To do this, we iterate over all of the matched @@ -346,6 +530,35 @@ static void op_pci_write(QTestState *s, const unsigned char * data, size_t len) } } +static void op_add_dma_pattern(QTestState *s, + const unsigned char *data, size_t len) +{ + struct { + /* + * index and stride can be used to increment the index-th byte of the + * pattern by the value stride, for each loop of the pattern. + */ + uint8_t index; + uint8_t stride; + } a; + + if (len < sizeof(a) + 1) { + return; + } + memcpy(&a, data, sizeof(a)); + pattern p = {a.index, a.stride, len - sizeof(a), data + sizeof(a)}; + p.index = a.index % p.len; + g_array_append_val(dma_patterns, p); + return; +} + +static void op_clear_dma_patterns(QTestState *s, + const unsigned char *data, size_t len) +{ + g_array_set_size(dma_patterns, 0); + dma_pattern_index = 0; +} + static void op_clock_step(QTestState *s, const unsigned char *data, size_t len) { qtest_clock_step_next(s); @@ -406,6 +619,8 @@ static void generic_fuzz(QTestState *s, const unsigned char *Data, size_t Size) [OP_WRITE] = op_write, [OP_PCI_READ] = op_pci_read, [OP_PCI_WRITE] = op_pci_write, + [OP_ADD_DMA_PATTERN] = op_add_dma_pattern, + [OP_CLEAR_DMA_PATTERNS] = op_clear_dma_patterns, [OP_CLOCK_STEP] = op_clock_step, }; const unsigned char *cmd = Data; @@ -435,6 +650,8 @@ static void generic_fuzz(QTestState *s, const unsigned char *Data, size_t Size) setitimer(ITIMER_VIRTUAL, &timer, NULL); } + op_clear_dma_patterns(s, NULL, 0); + while (cmd && Size) { /* Get the length until the next command or end of input */ nextcmd = memmem(cmd, Size, SEPARATOR, strlen(SEPARATOR)); @@ -451,6 +668,7 @@ static void generic_fuzz(QTestState *s, const unsigned char *Data, size_t Size) /* Advance to the next command */ cmd = nextcmd ? nextcmd + sizeof(SEPARATOR) - 1 : nextcmd; Size = Size - (cmd_len + sizeof(SEPARATOR) - 1); + g_array_set_size(dma_regions, 0); } _Exit(0); } else { @@ -465,6 +683,9 @@ static void usage(void) printf("QEMU_FUZZ_ARGS= the command line arguments passed to qemu\n"); printf("QEMU_FUZZ_OBJECTS= " "a space separated list of QOM type names for objects to fuzz\n"); + printf("Optionally: QEMU_AVOID_DOUBLE_FETCH= " + "Try to avoid racy DMA double fetch bugs? %d by default\n", + avoid_double_fetches); printf("Optionally: QEMU_FUZZ_TIMEOUT= Specify a custom timeout (us). " "0 to disable. %d by default\n", timeout); exit(0); @@ -535,9 +756,16 @@ static void generic_pre_fuzz(QTestState *s) if (getenv("QTEST_LOG")) { qtest_log_enabled = 1; } + if (getenv("QEMU_AVOID_DOUBLE_FETCH")) { + avoid_double_fetches = 1; + } if (getenv("QEMU_FUZZ_TIMEOUT")) { timeout = g_ascii_strtoll(getenv("QEMU_FUZZ_TIMEOUT"), NULL, 0); } + qts_global = s; + + dma_regions = g_array_new(false, false, sizeof(address_range)); + dma_patterns = g_array_new(false, false, sizeof(pattern)); fuzzable_memoryregions = g_hash_table_new(NULL, NULL); fuzzable_pci_devices = g_ptr_array_new(); -- 2.28.0