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AK: Replace the mutable String::replace API with an immutable version

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This removes the awkward String::replace API which was the only String
API which mutated the String and replaces it with a new immutable
version that returns a new String with the replacements applied. This
also fixes a couple of UAFs that were caused by the use of this API.

As an optimization an equivalent StringView::replace API was also added
to remove an unnecessary String allocations in the format of:
`String { view }.replace(...);`
This commit is contained in:
Idan Horowitz 2021-09-11 02:15:44 +03:00
parent aba4c9579f
commit 6704961c82
26 changed files with 72 additions and 118 deletions
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7
Userland/Libraries/LibJS/Runtime/RegExpPrototype.cpp
View file

@ -84,12 +84,7 @@ static String escape_regexp_pattern(const RegExpObject& regexp_object)
if (pattern.is_empty())
return "(?:)";
// FIXME: Check u flag and escape accordingly
pattern.replace("\n", "\\n", true);
pattern.replace("\r", "\\r", true);
pattern.replace(LINE_SEPARATOR_STRING, "\\u2028", true);
pattern.replace(PARAGRAPH_SEPARATOR_STRING, "\\u2029", true);
pattern.replace("/", "\\/", true);
return pattern;
return pattern.replace("\n", "\\n", true).replace("\r", "\\r", true).replace(LINE_SEPARATOR_STRING, "\\u2028", true).replace(PARAGRAPH_SEPARATOR_STRING, "\\u2029", true).replace("/", "\\/", true);
}
// 22.2.5.2.3 AdvanceStringIndex ( S, index, unicode ), https://tc39.es/ecma262/#sec-advancestringindex

3
Userland/Libraries/LibJS/Runtime/StringPrototype.cpp
View file

@ -1141,11 +1141,10 @@ static Value create_html(GlobalObject& global_object, Value string, const String
auto value_string = value.to_string(global_object);
if (vm.exception())
return {};
value_string.replace("\"", """, true);
builder.append(' ');
builder.append(attribute);
builder.append("=\"");
builder.append(value_string);
builder.append(value_string.replace("\"", """, true));
builder.append('"');
}
builder.append('>');