wasi-libc

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Today dlmalloc has hardcoded `MALLOC_ALIGNMENT` of 2*pointer size: https://github.com/WebAssembly/wasi-libc/blob/3c4a3f94d1ce685a672ec9a642f1ae42dae16eb1/dlmalloc/src/malloc.c#L628 Emscripten has had the same issue basically forever, but its not standards compliant and is causing issues for some codebases that...

sbc100

Generation user-defined custom section

2

(this probably doesn't belong here, but I couldn't find better repo to raise it on) Are there any example of generation user-defined custom sections? I tried smth like this ```c...

mikevoronov

Implementing errno with WASI modularization

2

With WASI modularization, each proposal will be moving to having its own error code, rather than a single unified errno across all WASI APIs: - https://github.com/WebAssembly/wasi-filesystem/issues/29 - https://github.com/WebAssembly/wasi-clocks/issues/5 - https://github.com/WebAssembly/wasi-random/issues/8...

sunfishcode

global dlmalloc structures clobbered without warning by large stack variable

12

(this probably doesn't belong here, but I couldn't decide which repo to raise it on) Steps to reproduce: 1. clone https://github.com/aidanhs/wasm-stack-clobber 2. enter the repo directory 3. download and untar...

aidanhs

Allow mk*temp on WASI

17

Currently, the corresponding code for `mkstemp`, `mkostemp` and `mkdtemp` is commented out, so any C code relying on those functions fails to compile: https://github.com/WebAssembly/wasi-libc/blob/5ccfab77b097a5d0184f91184952158aa5904c8d/libc-top-half/musl/include/stdlib.h#L116-L120 The comment says it's done because...

RReverser

sbrk only works for limited inputs

1

sbrk implementation in wasi-libc assumes the input is aligned to 64KB, and doesn't support negative inputs. Presumably this is sufficient for malloc implementation, but I'm not sure this is conformant...

zeux

memcpy is much larger than Emscripten variant

2

I'm in the process of [experimentally] migrating some code that today gets compiled via Emscripten to wasi-sdk. Doing size comparisons, for one of the reactors the Emscripten-compiled binary is significantly...

zeux

This [code](https://github.com/WebAssembly/wasi-libc/blob/320054e84f8f2440def3b1c8700cedb8fd697bf8/libc-top-half/musl/src/env/setenv.c#L36) could lead to integer overflow into malloc. In its turn with subsequent `memcpy` it could lead to heap overflow. Hypothetically it could affect users. If it is matter,...

mikevoronov

Hi! I have a use case when I need to periodically change WASI state (especially, envs) of already instantiated Wasm module. Seems that this [_initialize](https://github.com/WebAssembly/wasi-libc/blob/84c0778bff35bca3b5fa7814a3e1f3fb36362af6/libc-bottom-half/crt/crt1-reactor.c#L3) could work for me. I'm...

mikevoronov

Review of errors and warnings, while porting/patching GNU make port

2

Hi there. I wanted to practice in using LLVM backend, for WebAssembly, while compiling with Clang (without usage of emscripten, in the current pipeline). I will have to re-write most...

advancedwebdeveloper