RGBCube/serenity
1
Fork 0
mirror of https://github.com/RGBCube/serenity synced 2025-05-14 09:24:57 +00:00
Code Issues Activity Actions

AK+Everywhere: Fix data corruption due to code-point-to-char conversion

Browse source 
In particular, StringView::contains(char) is often used with a u32
code point. When this is done, the compiler will for some reason allow
data corruption to occur silently.

In fact, this is one of two reasons for the following OSS Fuzz issue:
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=49184
This is probably a very old bug.

In the particular case of URLParser, AK::is_url_code_point got confused:
    return /* ... */ || "!$&'()*+,-./:;=?@_~"sv.contains(code_point);
If code_point is a large code point that happens to have the correct
lower bytes, AK::is_url_code_point is then convinced that the given
code point is okay, even if it is actually problematic.

This commit fixes *only* the silent data corruption due to the erroneous
conversion, and does not fully resolve OSS-Fuzz#49184.
This commit is contained in:
Ben Wiederhake 2022-09-12 16:31:16 +02:00 • committed by Andrew Kaster
parent f07e0180d6
commit 3aeb57ed09
7 changed files with 29 additions and 13 deletions
Download patch file Download diff file Expand all files Collapse all files

1
AK/StringView.h
View file

@ -88,6 +88,7 @@ public:
[[nodiscard]] bool matches(StringView mask, CaseSensitivity = CaseSensitivity::CaseInsensitive) const;
[[nodiscard]] bool matches(StringView mask, Vector<MaskSpan>&, CaseSensitivity = CaseSensitivity::CaseInsensitive) const;
[[nodiscard]] bool contains(char) const;
[[nodiscard]] bool contains(u32) const;
[[nodiscard]] bool contains(StringView, CaseSensitivity = CaseSensitivity::CaseSensitive) const;
[[nodiscard]] bool equals_ignoring_case(StringView other) const;