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6b51bd334f
GuestMemory::new returns an error if the requested size is not divisible by the page size. The zimage fuzzer was using a GuestMemory size based on the size of the fuzzer input; however, it doesn't necessarily make sense to limit the guest memory to the size of the input. Pick an arbitrary 256 MB (matching the block fuzzer), which is also a page size multiple to resolve the original issue. BUG=chromium:977883 TEST=/usr/libexec/fuzzers/crosvm_zimage_fuzzer in cros_fuzz shell Change-Id: I08c6be9d920bede18d67f8a1c5c39b9d37fb839c Signed-off-by: Daniel Verkamp <dverkamp@chromium.org> Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/crosvm/+/1645040 Tested-by: kokoro <noreply+kokoro@google.com>
43 lines
1.4 KiB
Rust
43 lines
1.4 KiB
Rust
// Copyright 2019 The Chromium OS Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#![no_main]
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use sys_util::{GuestAddress, GuestMemory, SharedMemory};
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use std::fs::File;
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use std::io::Write;
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use std::panic;
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use std::process;
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use std::slice;
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const MEM_SIZE: u64 = 256 * 1024 * 1024;
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fn make_elf_bin(elf_bytes: &[u8]) -> File {
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let mut shm = SharedMemory::new(None).expect("failed to create shared memory");
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shm.set_size(elf_bytes.len() as u64)
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.expect("failed to set shared memory size");
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shm.write_all(elf_bytes)
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.expect("failed to write elf to shared memoy");
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shm.into()
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}
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#[export_name = "LLVMFuzzerTestOneInput"]
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pub fn test_one_input(data: *const u8, size: usize) -> i32 {
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// We cannot unwind past ffi boundaries.
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panic::catch_unwind(|| {
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// Safe because the libfuzzer runtime will guarantee that `data` is at least
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// `size` bytes long and that it will be valid for the lifetime of this
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// function.
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let bytes = unsafe { slice::from_raw_parts(data, size) };
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let mut kimage = make_elf_bin(bytes);
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let mem = GuestMemory::new(&[(GuestAddress(0), MEM_SIZE)]).unwrap();
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let _ = kernel_loader::load_kernel(&mem, GuestAddress(0), &mut kimage);
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})
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.err()
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.map(|_| process::abort());
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0
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}
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