[release/6.0] [mono] Use unsigned char when computing UTF8 string hashes #83303
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Hello - Today is code-complete day for merging changes that should go into the April servicing release. Todos:
If it's not critical to get it merged in the April release, we can wait until next month. |
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The C standard does not specify whether `char` is signed or unsigned, it is implementation defined. Apparently Android aarch64 makes a different choice than other platforms (at least macOS arm64 and Windows x64 give different results). Mono uses `mono_metadata_str_hash` in the AOT compiler and AOT runtime to optimize class name lookup. As a result, classes whose names include UTF-8 continuation bytes (with the high bit = 1) will hash differently in the AOT compiler and on the device. Fixes #82187 Fixes #78638
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Backport of #83273 to release/6.0
Resolves #82187
Resolves #78638
The corresponding 7.0 PR is #83302
Customer Impact
Resolves crashes in Release builds of Android apps that include classes with non-ASCII names that use AOT compilation.
Testing
Manual testing. New regression test.
Risk
Low. For code that uses ASCII names the hash code computation is unchanged.