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View Code? Open in Web Editor NEWWebAssembly decoder & disassembler library
License: MIT License
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Could i get CVE numbers for reporting the bugs
I fuzzed this library and got some crash. Could i get cve numbers for reporting the bugs. crash like this:
for cur_sec, cur_sec_data in mod_iter:
File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/wasm/decode.py", line 45, in decode_module
sec_len, sec_data, _ = sec.from_raw(None, module_wnd)
File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/wasm/types.py", line 302, in from_raw
data_len, val, data_type = cur_field.from_raw(data, raw[offs:])
File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/wasm/types.py", line 188, in from_raw
return self.choice_field_map[choice].from_raw(ctx, raw)
KeyError: 90
wasm assembler
Is there also a python wasm assembler somewhere, so that we can write back the modified AST?
KeyError: 96
Hi, just did a simple test:
int add(int a, int b) {
return a + b;
}
emcc testwasm.c -o test.wasm -s WASM=1 -s SIDE_MODULE=1
Command wasmdump --disas test.wasm fails with:
emscripten@euve254883:~$ wasmdump --disas test.wasm
- [ ModuleHeader
| magic = 0x6d736100
| version = 0x1
- [ Section
| id = 0
| payload_len = 12
| name_len = 6
| name = "dylink"
| payload = [0x80, 0x80, 0xc0, 0x2, 0x0, 0x1, 0x9c, 0x80, 0x80, 0x80, 0x0, 0x6]
| overhang = []
Traceback (most recent call last):
File "/home/emscripten/.local/bin/wasmdump", line 11, in <module>
load_entry_point('wasm==1.1', 'console_scripts', 'wasmdump')()
File "/home/emscripten/.local/lib/python2.7/site-packages/wasm/__main__.py", line 34, in dump
for cur_sec, cur_sec_data in mod_iter:
File "/home/emscripten/.local/lib/python2.7/site-packages/wasm/decode.py", line 45, in decode_module
sec_len, sec_data, _ = sec.from_raw(None, module_wnd)
File "/home/emscripten/.local/lib/python2.7/site-packages/wasm/types.py", line 302, in from_raw
data_len, val, data_type = cur_field.from_raw(data, raw[offs:])
File "/home/emscripten/.local/lib/python2.7/site-packages/wasm/types.py", line 188, in from_raw
return self.choice_field_map[choice].from_raw(ctx, raw)
KeyError: 96
Version emcc -v:
emcc (Emscripten gcc/clang-like replacement + linker emulating GNU ld) 1.37.18
clang version 4.0.0 (emscripten 1.37.18 : 1.37.18)
Target: x86_64-pc-windows-msvc
Thread model: posix
InstalledDir: E:\emsdk-1.35.0-portable-64bit\clang\e1.37.18_64bit
INFO:root:(Emscripten: Running sanity checks)
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Decoder fails on some WASM files
Error like
File "/usr/local/lib/python3.7/site-packages/wasm-1.2-py3.7.egg/wasm/types.py", line 302, in from_raw
data_len, val, data_type = cur_field.from_raw(data, raw[offs:])
File "/usr/local/lib/python3.7/site-packages/wasm-1.2-py3.7.egg/wasm/types.py", line 188, in from_raw
return self.choice_field_map[choice].from_raw(ctx, raw)
KeyError: 105
Get the name of a function
How is it possible to get the associated name of the function body?
Documentation?
This looks like it could be a very useful library for my use case, but the two very short examples provided give no insight into how I can use the module to extract functions from a .wasm file. Could you provide some kind of documentation for the module's methods, classes and class methods, etc. along with more comprehensive examples, so that we don't have to sift through the source code to figure out how to use this module?
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