From patchwork Mon Oct 26 10:06:18 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Thomas Huth X-Patchwork-Id: 302077 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=-9.9 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED 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 41D97C4363A for ; Mon, 26 Oct 2020 10:19:20 +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 AC40622242 for ; Mon, 26 Oct 2020 10:19:19 +0000 (UTC) Authentication-Results: mail.kernel.org; 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Mon, 26 Oct 2020 10:07:02 +0000 (UTC) Received: from thuth.com (ovpn-112-104.ams2.redhat.com [10.36.112.104]) by smtp.corp.redhat.com (Postfix) with ESMTP id 4A2328B842; Mon, 26 Oct 2020 10:07:01 +0000 (UTC) From: Thomas Huth To: qemu-devel@nongnu.org, Peter Maydell Subject: [PULL 17/31] fuzz: add a crossover function to generic-fuzzer Date: Mon, 26 Oct 2020 11:06:18 +0100 Message-Id: <20201026100632.212530-18-thuth@redhat.com> In-Reply-To: <20201026100632.212530-1-thuth@redhat.com> References: <20201026100632.212530-1-thuth@redhat.com> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.15 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=thuth@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Received-SPF: pass client-ip=63.128.21.124; envelope-from=thuth@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/10/25 21:03:19 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] X-Spam_score_int: -30 X-Spam_score: -3.1 X-Spam_bar: --- X-Spam_report: (-3.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H5=-1, RCVD_IN_MSPIKE_WL=-0.01, 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: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Alexander Bulekov Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" From: Alexander Bulekov Reviewed-by: Darren Kenny Signed-off-by: Alexander Bulekov Message-Id: <20201023150746.107063-10-alxndr@bu.edu> Signed-off-by: Thomas Huth --- tests/qtest/fuzz/generic_fuzz.c | 86 +++++++++++++++++++++++++++++++++ 1 file changed, 86 insertions(+) diff --git a/tests/qtest/fuzz/generic_fuzz.c b/tests/qtest/fuzz/generic_fuzz.c index 6ec20464bd..592b78ffe2 100644 --- a/tests/qtest/fuzz/generic_fuzz.c +++ b/tests/qtest/fuzz/generic_fuzz.c @@ -810,6 +810,91 @@ static void generic_pre_fuzz(QTestState *s) counter_shm_init(); } +/* + * When libfuzzer gives us two inputs to combine, return a new input with the + * following structure: + * + * Input 1 (data1) + * SEPARATOR + * Clear out the DMA Patterns + * SEPARATOR + * Disable the pci_read/write instructions + * SEPARATOR + * Input 2 (data2) + * + * The idea is to collate the core behaviors of the two inputs. + * For example: + * Input 1: maps a device's BARs, sets up three DMA patterns, and triggers + * device functionality A + * Input 2: maps a device's BARs, sets up one DMA pattern, and triggers device + * functionality B + * + * This function attempts to produce an input that: + * Ouptut: maps a device's BARs, set up three DMA patterns, triggers + * functionality A device, replaces the DMA patterns with a single + * patten, and triggers device functionality B. + */ +static size_t generic_fuzz_crossover(const uint8_t *data1, size_t size1, const + uint8_t *data2, size_t size2, uint8_t *out, + size_t max_out_size, unsigned int seed) +{ + size_t copy_len = 0, size = 0; + + /* Check that we have enough space for data1 and at least part of data2 */ + if (max_out_size <= size1 + strlen(SEPARATOR) * 3 + 2) { + return 0; + } + + /* Copy_Len in the first input */ + copy_len = size1; + memcpy(out + size, data1, copy_len); + size += copy_len; + max_out_size -= copy_len; + + /* Append a separator */ + copy_len = strlen(SEPARATOR); + memcpy(out + size, SEPARATOR, copy_len); + size += copy_len; + max_out_size -= copy_len; + + /* Clear out the DMA Patterns */ + copy_len = 1; + if (copy_len) { + out[size] = OP_CLEAR_DMA_PATTERNS; + } + size += copy_len; + max_out_size -= copy_len; + + /* Append a separator */ + copy_len = strlen(SEPARATOR); + memcpy(out + size, SEPARATOR, copy_len); + size += copy_len; + max_out_size -= copy_len; + + /* Disable PCI ops. Assume data1 took care of setting up PCI */ + copy_len = 1; + if (copy_len) { + out[size] = OP_DISABLE_PCI; + } + size += copy_len; + max_out_size -= copy_len; + + /* Append a separator */ + copy_len = strlen(SEPARATOR); + memcpy(out + size, SEPARATOR, copy_len); + size += copy_len; + max_out_size -= copy_len; + + /* Copy_Len over the second input */ + copy_len = MIN(size2, max_out_size); + memcpy(out + size, data2, copy_len); + size += copy_len; + max_out_size -= copy_len; + + return size; +} + + static GString *generic_fuzz_cmdline(FuzzTarget *t) { GString *cmd_line = g_string_new(TARGET_NAME); @@ -830,6 +915,7 @@ static void register_generic_fuzz_targets(void) .get_init_cmdline = generic_fuzz_cmdline, .pre_fuzz = generic_pre_fuzz, .fuzz = generic_fuzz, + .crossover = generic_fuzz_crossover }); }