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Unsoundness in crate anstream #156

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burakemir opened this issue Jan 11, 2024 · 0 comments · Fixed by #158
Closed

Unsoundness in crate anstream #156

burakemir opened this issue Jan 11, 2024 · 0 comments · Fixed by #158

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@burakemir
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There is an unsoundness issue with multibyte sequences.

When I give a valid UTF8 string "ö\x1b😀" as input to crates/anstream/src/adapter/strip.rs the code will be confused.
The UTF8 bytes are \xc3\xb6 then \x1b then \xf0\x9f\x98\x80.

When we loop over "non-printable bytes" \x1b\xf0 will be considered as some non-printable sequence...

I do not know whether it is a valid escape sequence or not, but it does not matter: we will produce a broken str from the incorrectly segmented bytes via str::from_utf8_unchecked, and that should never happen.

I have a tentative fix that makes the code sound, which I will reference after filing the issue (so I can reference the issue in the PR).

Full credit goes to @Ralith who reviewed this code and asked me to follow up.
@burakemir burakemir mentioned this issue Jan 11, 2024
Closed
epage added a commit to epage/anstyle that referenced this issue Jan 12, 2024
@epage
fix(stream): Don't break out of UTF8 character part-way
a54cb5b 
This fixes a soundness issue where we create invalid UTF-8 data and then
do a `str::from_unchecked` on release builds.

This ensures we ignore up-to the start of UTF-8 sequences and not
mid-way through.

Fixes rust-cli#156
@epage epage mentioned this issue Jan 12, 2024
Merged
alexanderkjall added a commit to alexanderkjall/advisory-db that referenced this issue Sep 8, 2024
@alexanderkjall
add information about unsoundness issue in anstream, found here: rust…
0ec0bd2 
…-cli/anstyle#156
@alexanderkjall alexanderkjall mentioned this issue Sep 8, 2024
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fix(stream): Don't break out of UTF8 character part-way epage/anstyle
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@burakemir