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How
does Syz-manager synchronize statistics information with fuzzers?
How does Syz-manager gets crashes, total execution times, ... ,
during the fuzzing process?
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How does Syzkaller generate a program (syscall sequences)?
Hey guys! It’s been a while since I last updated my blog. Of course, I haven’t been idle during this time. I successfully published a paper and received two verbal PHD offers from CUHK. Everything is getting better and I love 2025!
2025.3.23Xiao
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Finding
the Dwarf: Recovering Precise Types from WebAssembly Binaries
会议：PLDI'22
作者：Daniel Lehmann, Michael Pradel
1. 问题背景
随着WebAssembly越来越受欢迎，在越来越多的应用领域应用，Wasm逆向的需求也越来越旺盛。例如，一个开发者可能回想了解其在项目中使用的第三方Wasm
module，以更加了解其exported functions。
理解一个WebAssembly binary的第一步就是理解函数的type
signatures（参数、返回值）。由于type与理解底层代码高度相关，因此现有的native
binary逆向工程工具都以type为目标 [12, 14,
57]。开发人员的研究也表明，static type有助于理解代码。
但Wasm
binary中的函数type种类非常受限，wasm只支持i32/i64/f32/f64四种基本类型。一个i32可能是一个signed或者unsigned
integer，又或者pointer。因此，如果能恢复高级语言中的type是非常有用的。
恢复高级type的一种方法是基于 "经典 "data-flow anlysis或type
inference，即根据程序中值的使用方式收集约束[12]。不过，这种方法实施起来比较复杂，而且通常需要建立在繁重的分析框架上，如
BAP 或 CodeSurfer [43, 54]。支持
WebAssembly，尤其是其略显特别的堆栈机[25]，将是一项非同小可的工作。
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Wasmati:
An efficient static vulnerability scanner for WebAssembly
作者：Tiago Brito, Pedro Lopes, Nuno Santos
时间：2022.4
期刊：Computers & Security(B刊)
Code：wasmati/wasmati: A Generic and
Efficient Code Property Graph Infrastructure forScanning Vulnerabilities
in WebAssembly Code (github.com)
ABSTRACT
本文提出了Wasmati，一种static analysis tool用于寻找Wasm
binary中的漏洞。其基于code property
graph(CPG)。作者给出了Wasm中CPG的定义和生成方法，自定义了快速生成CPG的算法和一个查询语言Wasmati
Query
Language（WQL）。作者实现了10中不同的vulnerability查询，并在四种dateset和真实程序上做了测试。
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<article id="post-【技术积累】WasmParser-Examples" class="article article-type-post" itemscope itemprop="blogPost" >
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WasmParser Examples解析
针对Rust库Wasmparesr中给出的如下样例：
https://docs.rs/wasmparser/latest/wasmparser/struct.Parser.html#method.parse
https://docs.rs/wasmparser/latest/wasmparser/struct.Parser.html#method.parse_all
的解析
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BoKASAN:
Binary-only Kernel Address Sanitizer for Effective Kernel Fuzzing
会议：Security'23
作者：Mingi Cho，Dohyeon An，Hoyong Jin，Taekyoung
Kwon(Yonsei University)
ABSTRACT
Kernel Address Sanitizer（KASAN）是在 Linux
内核中查找UAF和out-of-bounds的重要工具，但它需要内核源代码来进行编译时插桩。要将KASAN应用于闭源系统，我们必须开发一种纯二进制KASAN，而这是一项挑战。使用二进制重写和processor
support来为二进制模块运行KASAN的技术需要一个已经插桩好KASAN的内核，因此仍然需要内核源代码。动态插桩提供了一种替代方法，但其大大增加了性能开销，使得内核fuzzing不切实际。
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<article id="post-【技术积累】Ret2libc中的main与_start函数" class="article article-type-post" itemscope itemprop="blogPost" >
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Ret2libc中的main与_start函数
1. 题目背景
Ret2libc3练习(ret2libc3-CTF
Wiki)是一个简单的return to
libc练习题，其通过向程序输入两次payload来get
shell，第一次payload用于获取__libc_start_main函数真实加载地址，第二次payload通过该加载地址计算出libc中的偏移，进而调用system函数：
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Fuzzm Heap&Stack Instrumentation代码解析1. instrument_with_heap_canary_check()
Source: /fuzzm-project/wasm_instrumenter/src/canaries.rs
Functionality: 对Wasm插入heap canary
1. dlmalloc(size)
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<article id="post-【论文阅读】WaVe-a-verifiably-secure-WebAssembly-sandboxing-runtime" class="article article-type-post" itemscope itemprop="blogPost" >
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WaVe: a
verifiably secure WebAssembly sandboxing runtime
作者：Evan Johnson(UCSD), Evan Laufer(Stanford),
Zijie Zhao(UIUC), Fraser Brown(CMU)
会议：SP'23
Abstract
WebAssembly (Wasm)
是一种流行的可移植字节码，其编译器会自动插入运行时检查，以确保数据流和控制流被限制在单一内存段内。事实上，现代编译后的Wasm程序已经发展到可以自行验证这些检查的程度，从而将编译器从可信计算基础中移除。
然而，由此产生的完整性属性仅对严格在 Wasm
沙箱内执行的代码有效。与运行时系统的任何交互（运行时系统管理沙箱并公开用于访问操作系统资源的
WebAssembly 系统接口
(WASI)）都是在此契约之外进行的。由此产生的难题是，如何在保持 Wasm
强大隔离特性的同时，还允许此类程序与外部世界（即文件系统、网络等）进行交互。
我们的论文通过实现 WASI 的已验证安全运行时系统 WaVe
提出了这一问题的解决方案。我们从机制上验证了与 WaVe
的交互（包括操作系统的副作用）不仅能保持 Wasm
的内存安全保证，还能保持对主机操作系统的存储和网络资源的访问隔离。我们从机制上验证了与WaVe的交互（包括操作系统的副作用）不仅能保持Wasm的内存安全保证，还能保持主机操作系统存储和网络资源的访问隔离。最后，尽管运行时完全脱离了可信计算基础，我们还是证明了WaVe的性能可与现有的工业（但不安全）Wasm运行时媲美。
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