From 0e1dd411018b6d1c74f8d18b50a51926db35af97 Mon Sep 17 00:00:00 2001 From: xjd Date: Wed, 13 Mar 2024 11:27:59 +0800 Subject: [PATCH] Fuzzing snapshot2 (#2) * Fuzzing tests for snapshot2 * Randomize program and data --- fuzz/Cargo.toml | 11 +++ fuzz/fuzz_targets/snapshot2.rs | 146 +++++++++++++++++++++++++++++++++ 2 files changed, 157 insertions(+) create mode 100644 fuzz/fuzz_targets/snapshot2.rs diff --git a/fuzz/Cargo.toml b/fuzz/Cargo.toml index fcee6175..80aea286 100644 --- a/fuzz/Cargo.toml +++ b/fuzz/Cargo.toml @@ -12,10 +12,14 @@ cargo-fuzz = true libfuzzer-sys = "0.4" spike-sys = "0.1.2" + [dependencies.ckb-vm] path = ".." features = ["asm"] +[dependencies.ckb-vm-definitions] +path = "../definitions" + # Prevent this from interfering with workspaces [workspace] members = ["."] @@ -43,3 +47,10 @@ name = "isa_b" path = "fuzz_targets/isa_b.rs" test = false doc = false + + +[[bin]] +name = "snapshot2" +path = "fuzz_targets/snapshot2.rs" +test = false +doc = false diff --git a/fuzz/fuzz_targets/snapshot2.rs b/fuzz/fuzz_targets/snapshot2.rs new file mode 100644 index 00000000..31f71886 --- /dev/null +++ b/fuzz/fuzz_targets/snapshot2.rs @@ -0,0 +1,146 @@ +#![no_main] +use ckb_vm::{ + elf::{LoadingAction, ProgramMetadata}, + machine::VERSION2, + memory::{round_page_down, round_page_up, FLAG_EXECUTABLE, FLAG_FREEZED}, + snapshot2::{DataSource, Snapshot2Context}, + Bytes, CoreMachine, DefaultMachine, DefaultMachineBuilder, Error, Memory, ISA_A, ISA_B, + ISA_IMC, ISA_MOP, +}; +use ckb_vm_definitions::{asm::AsmCoreMachine, RISCV_MAX_MEMORY}; +use libfuzzer_sys::fuzz_target; +use std::collections::VecDeque; + +struct Deque { + n: VecDeque, +} + +impl Deque { + fn new(data: [u8; 32]) -> Self { + Self { + n: VecDeque::from(data), + } + } + + fn u8(&mut self) -> u8 { + let r = self.n.pop_front().unwrap(); + self.n.push_back(r); + r + } + + fn u16(&mut self) -> u16 { + let mut r = [0u8; 2]; + r.fill_with(|| self.u8()); + u16::from_le_bytes(r) + } + + fn u32(&mut self) -> u32 { + let mut r = [0u8; 4]; + r.fill_with(|| self.u8()); + u32::from_le_bytes(r) + } +} + +const DATA_SOURCE_PROGRAM: u32 = 0; +const DATA_SOURCE_CONTENT: u32 = 1; + +#[derive(Clone)] +pub struct DummyData { + pub program: Bytes, + pub content: Bytes, +} + +impl DataSource for DummyData { + fn load_data(&self, id: &u32, offset: u64, length: u64) -> Result<(Bytes, u64), Error> { + let data = match *id { + DATA_SOURCE_PROGRAM => &self.program, + DATA_SOURCE_CONTENT => &self.content, + _ => unreachable!(), + }; + Ok(( + data.slice(offset as usize..offset as usize + length as usize), + length as u64, + )) + } +} + +fn build_machine() -> DefaultMachine> { + let isa = ISA_IMC | ISA_A | ISA_B | ISA_MOP; + let core_machine = AsmCoreMachine::new(isa, VERSION2, u64::max_value()); + DefaultMachineBuilder::new(core_machine).build() +} + +fuzz_target!(|data: [u8; 32]| { + let mut deque = Deque::new(data); + let dummy_data = { + let mut program = vec![0u8; deque.u16() as usize + 1024]; + for i in 0..program.len() { + program[i] = (i % 256) as u8; + } + let mut content = vec![0u8; deque.u16() as usize + 1024]; + for i in 0..content.len() { + content[i] = (i / 256) as u8; + } + DummyData { + program: program.into(), + content: content.into(), + } + }; + let mut loading_action_vec: Vec = Vec::new(); + for i in 0..2 + deque.u8() as usize % 3 { + let segsize = deque.u16() as u64 % 1024; + let p_vaddr = i as u64 * 1024 * 256; + let p_memsz = segsize; + let p_offset = deque.u32() as u64 % (dummy_data.program.len() as u64 - segsize); + let p_filesz = segsize; + let aligned_start = round_page_down(p_vaddr); + let padding_start = (p_vaddr).wrapping_sub(aligned_start); + let size = round_page_up((p_memsz).wrapping_add(padding_start)); + let slice_start = p_offset; + let slice_end = p_offset.wrapping_add(p_filesz); + assert!(slice_start <= slice_end); + loading_action_vec.push(LoadingAction { + addr: aligned_start, + size, + flags: FLAG_EXECUTABLE | FLAG_FREEZED, + source: slice_start as u64..slice_end as u64, + offset_from_addr: padding_start, + }) + } + let mut ctx = Snapshot2Context::new(dummy_data.clone()); + let metadata = ProgramMetadata { + actions: loading_action_vec, + entry: 0, + }; + + let mut machine1 = build_machine(); + let mut machine2 = build_machine(); + machine1 + .load_program_with_metadata(&dummy_data.program, &metadata, &vec![]) + .unwrap(); + ctx.mark_program(&mut machine1, &metadata, &0, 0).unwrap(); + for i in 0..2 + deque.u8() as usize % 3 { + let id = i as u32 % 2; + let data = match id { + DATA_SOURCE_PROGRAM => &dummy_data.program, + DATA_SOURCE_CONTENT => &dummy_data.content, + _ => unreachable!(), + }; + let length = deque.u16() as u64 % 1024; + let offset = deque.u32() as u64 % (data.len() as u64 - length); + let addr = 1024 * 1024 + (deque.u8() as u64 % 4) * 1024 * 256; + ctx.store_bytes(&mut machine1, addr, &id, offset, length) + .unwrap(); + } + let snapshot = ctx.make_snapshot(&mut machine1).unwrap(); + ctx.resume(&mut machine2, &snapshot).unwrap(); + let mem1 = machine1 + .memory_mut() + .load_bytes(0, RISCV_MAX_MEMORY as u64) + .unwrap(); + let mem2 = machine2 + .memory_mut() + .load_bytes(0, RISCV_MAX_MEMORY as u64) + .unwrap(); + assert_eq!(mem1, mem2); +});