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implement getentropy via __wasi_random_get. #22819

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implement getentropy via __wasi_random_get. #22819

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cbd9450
implement getentropy via __wasi_random_get.
walkingeyerobot Oct 31, 2024
985b7ba
match wasi-libc's implementation
walkingeyerobot Oct 31, 2024
6414b8d
Merge branch 'emscripten-core:main' into main
walkingeyerobot Oct 31, 2024
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18 changes: 15 additions & 3 deletions system/lib/standalone/standalone.c
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Original file line number Diff line number Diff line change
Expand Up @@ -136,10 +136,22 @@ weak int __syscall_lstat64(intptr_t path, intptr_t buf) {
return -ENOSYS;
}

// There is no good source of entropy without an import. Make this weak so that
// it can be replaced with a pRNG or a proper import.
// copied from wasi-libc's getentropy.c:
// https://github.com/WebAssembly/wasi-libc/blob/main/libc-bottom-half/sources/getentropy.c
weak int getentropy(void* buffer, size_t length) {
abort();
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@sbc100 sbc100 Oct 31, 2024

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Can you copy the code from https://github.com/WebAssembly/wasi-libc/blob/main/libc-bottom-half/sources/getentropy.c? (With a link/attribution I think).

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@walkingeyerobot walkingeyerobot Oct 31, 2024

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done. should I leave it weak?

if (length > 256) {
errno = EIO;
return -1;
}

int r = __wasi_random_get(buffer, length);

if (r != 0) {
errno = r;
return -1;
}

return 0;
}

// Emscripten additions
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