mirror of
https://github.com/cloud-hypervisor/cloud-hypervisor.git
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fuzz: Add fuzzer for HTTP API
Fuzz the HTTP API handling code with a minimum HTTP API receiver (e.g. mocking the behavior of our "vmm" thread). Signed-off-by: Bo Chen <chen.bo@intel.com>
This commit is contained in:
Bo Chen
Rob Bradford
parent
eb056d374a
commit
e5155bab62
6
fuzz/Cargo.lock
generated
6
fuzz/Cargo.lock
generated
@ -179,8 +179,11 @@ dependencies = [
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"block_util",
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"cloud-hypervisor",
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"devices",
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"epoll",
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"libc",
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"libfuzzer-sys",
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"micro_http",
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"once_cell",
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"qcow",
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"seccompiler",
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"vhdx",
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@ -189,6 +192,7 @@ dependencies = [
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"vm-device",
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"vm-memory",
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"vm-virtio",
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"vmm",
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"vmm-sys-util",
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]
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@ -444,7 +448,7 @@ dependencies = [
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[[package]]
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name = "micro_http"
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version = "0.1.0"
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source = "git+https://github.com/firecracker-microvm/micro-http?branch=main#9517a300370a158a7af0996b7eebf040d171e1a4"
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source = "git+https://github.com/firecracker-microvm/micro-http?branch=main#863b0370ba7e57f7df5b908ada9e5b44809ccae9"
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dependencies = [
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"libc",
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"vmm-sys-util",
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@ -11,13 +11,17 @@ cargo-fuzz = true
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[dependencies]
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block_util = { path = "../block_util" }
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devices = { path = "../devices" }
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epoll = "4.3.1"
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libc = "0.2.126"
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libfuzzer-sys = "0.4.3"
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micro_http = { git = "https://github.com/firecracker-microvm/micro-http", branch = "main" }
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once_cell = "1.13.0"
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qcow = { path = "../qcow" }
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seccompiler = "0.2.0"
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vhdx = { path = "../vhdx" }
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virtio-devices = { path = "../virtio-devices" }
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virtio-queue = "0.5.0"
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vmm = { path = "../vmm" }
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vmm-sys-util = "0.10.0"
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vm-memory = "0.8.0"
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vm-device = { path = "../vm-device" }
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@ -47,6 +51,12 @@ path = "fuzz_targets/cmos.rs"
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test = false
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doc = false
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[[bin]]
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name = "http_api"
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path = "fuzz_targets/http_api.rs"
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test = false
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doc = false
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[[bin]]
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name = "qcow"
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path = "fuzz_targets/qcow.rs"
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@ -64,4 +74,3 @@ name = "vhdx"
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path = "fuzz_targets/vhdx.rs"
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test = false
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doc = false
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196
fuzz/fuzz_targets/http_api.rs
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196
fuzz/fuzz_targets/http_api.rs
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@ -0,0 +1,196 @@
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// Copyright © 2022 Intel Corporation
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//
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// SPDX-License-Identifier: Apache-2.0
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#![no_main]
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use libfuzzer_sys::fuzz_target;
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use micro_http::Request;
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use once_cell::sync::Lazy;
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use std::os::unix::io::AsRawFd;
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use std::sync::mpsc::{channel, Receiver};
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use std::thread;
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use vmm::api::{http::*, ApiRequest, ApiResponsePayload};
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use vmm::{EpollContext, EpollDispatch};
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use vmm_sys_util::eventfd::EventFd;
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// Need to be ordered for test case reproducibility
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static ROUTES: Lazy<Vec<&Box<dyn EndpointHandler + Sync + Send>>> = Lazy::new(|| {
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let mut keys: Vec<&String> = HTTP_ROUTES.routes.keys().collect();
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keys.sort();
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keys.iter()
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.map(|k| HTTP_ROUTES.routes.get(*k).unwrap())
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.collect()
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});
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fuzz_target!(|bytes| {
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if bytes.len() < 2 {
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return;
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}
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let route = ROUTES[bytes[0] as usize % ROUTES.len()];
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if let Some(request) = generate_request(&bytes[1..]) {
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let exit_evt = EventFd::new(libc::EFD_NONBLOCK).unwrap();
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let api_evt = EventFd::new(libc::EFD_NONBLOCK).unwrap();
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let (api_sender, api_receiver) = channel();
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let http_receiver_thread = {
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let exit_evt = exit_evt.try_clone().unwrap();
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let api_evt = api_evt.try_clone().unwrap();
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thread::Builder::new()
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.name("http_receiver".to_string())
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.spawn(move || {
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http_receiver_stub(exit_evt, api_evt, api_receiver);
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})
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.unwrap()
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};
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route.handle_request(&request, api_evt, api_sender);
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exit_evt.write(1).ok();
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http_receiver_thread.join().unwrap();
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};
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});
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fn generate_request(bytes: &[u8]) -> Option<Request> {
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let req_method = match bytes[0] % 5 {
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0 => "GET",
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1 => "PUT",
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2 => "PATCH",
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3 => "POST",
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_ => "INVALID",
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};
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let request_line = format!("{} http://localhost/home HTTP/1.1\r\n", req_method);
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let req_body = &bytes[1..];
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let request = if req_body.len() > 0 {
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[
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format!("{}Content-Length: {}\r\n", request_line, req_body.len()).as_bytes(),
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req_body,
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]
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.concat()
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} else {
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format!("{}\r\n", request_line).as_bytes().to_vec()
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};
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Request::try_from(&request, None).ok()
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}
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fn http_receiver_stub(exit_evt: EventFd, api_evt: EventFd, api_receiver: Receiver<ApiRequest>) {
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let mut epoll = EpollContext::new().unwrap();
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epoll.add_event(&exit_evt, EpollDispatch::Exit).unwrap();
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epoll.add_event(&api_evt, EpollDispatch::Api).unwrap();
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let epoll_fd = epoll.as_raw_fd();
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let mut events = vec![epoll::Event::new(epoll::Events::empty(), 0); 2];
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let num_events;
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loop {
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num_events = match epoll::wait(epoll_fd, -1, &mut events[..]) {
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Ok(num_events) => num_events,
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Err(e) => match e.raw_os_error() {
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Some(libc::EAGAIN) | Some(libc::EINTR) => continue,
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_ => panic!("Unexpected epoll::wait error!"),
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},
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};
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break;
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}
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for event in events.iter().take(num_events) {
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let dispatch_event: EpollDispatch = event.data.into();
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match dispatch_event {
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EpollDispatch::Exit => {
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break;
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}
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EpollDispatch::Api => {
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for _ in 0..api_evt.read().unwrap() {
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let api_request = api_receiver.recv().unwrap();
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match api_request {
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ApiRequest::VmCreate(_, sender) => {
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sender.send(Ok(ApiResponsePayload::Empty)).unwrap();
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}
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ApiRequest::VmDelete(sender) => {
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sender.send(Ok(ApiResponsePayload::Empty)).unwrap();
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}
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ApiRequest::VmBoot(sender) => {
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sender.send(Ok(ApiResponsePayload::Empty)).unwrap();
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}
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ApiRequest::VmShutdown(sender) => {
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sender.send(Ok(ApiResponsePayload::Empty)).unwrap();
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}
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ApiRequest::VmReboot(sender) => {
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sender.send(Ok(ApiResponsePayload::Empty)).unwrap();
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}
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ApiRequest::VmInfo(sender) => {
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sender.send(Ok(ApiResponsePayload::Empty)).unwrap();
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}
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ApiRequest::VmmPing(sender) => {
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sender.send(Ok(ApiResponsePayload::Empty)).unwrap();
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}
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ApiRequest::VmPause(sender) => {
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sender.send(Ok(ApiResponsePayload::Empty)).unwrap();
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}
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ApiRequest::VmResume(sender) => {
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sender.send(Ok(ApiResponsePayload::Empty)).unwrap();
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}
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ApiRequest::VmSnapshot(_, sender) => {
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sender.send(Ok(ApiResponsePayload::Empty)).unwrap();
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}
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ApiRequest::VmRestore(_, sender) => {
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sender.send(Ok(ApiResponsePayload::Empty)).unwrap();
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}
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ApiRequest::VmmShutdown(sender) => {
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sender.send(Ok(ApiResponsePayload::Empty)).unwrap();
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}
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ApiRequest::VmResize(_, sender) => {
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sender.send(Ok(ApiResponsePayload::Empty)).unwrap();
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}
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ApiRequest::VmResizeZone(_, sender) => {
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sender.send(Ok(ApiResponsePayload::Empty)).unwrap();
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}
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ApiRequest::VmAddDevice(_, sender) => {
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sender.send(Ok(ApiResponsePayload::Empty)).unwrap();
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}
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ApiRequest::VmAddUserDevice(_, sender) => {
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sender.send(Ok(ApiResponsePayload::Empty)).unwrap();
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}
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ApiRequest::VmRemoveDevice(_, sender) => {
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sender.send(Ok(ApiResponsePayload::Empty)).unwrap();
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}
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ApiRequest::VmAddDisk(_, sender) => {
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sender.send(Ok(ApiResponsePayload::Empty)).unwrap();
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}
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ApiRequest::VmAddFs(_, sender) => {
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sender.send(Ok(ApiResponsePayload::Empty)).unwrap();
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}
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ApiRequest::VmAddPmem(_, sender) => {
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sender.send(Ok(ApiResponsePayload::Empty)).unwrap();
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}
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ApiRequest::VmAddNet(_, sender) => {
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sender.send(Ok(ApiResponsePayload::Empty)).unwrap();
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}
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ApiRequest::VmAddVdpa(_, sender) => {
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sender.send(Ok(ApiResponsePayload::Empty)).unwrap();
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}
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ApiRequest::VmAddVsock(_, sender) => {
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sender.send(Ok(ApiResponsePayload::Empty)).unwrap();
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}
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ApiRequest::VmCounters(sender) => {
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sender.send(Ok(ApiResponsePayload::Empty)).unwrap();
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}
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ApiRequest::VmReceiveMigration(_, sender) => {
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sender.send(Ok(ApiResponsePayload::Empty)).unwrap();
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}
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ApiRequest::VmSendMigration(_, sender) => {
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sender.send(Ok(ApiResponsePayload::Empty)).unwrap();
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}
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ApiRequest::VmPowerButton(sender) => {
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sender.send(Ok(ApiResponsePayload::Empty)).unwrap();
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}
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}
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}
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}
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_ => {
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panic!("Unexpected Epoll event");
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}
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}
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}
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}
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