RFR: 8273108: RunThese24H crashes with SEGV in markWord::displaced_mark_helper() after JDK-8268276
Scott Gibbons
duke at openjdk.java.net
Thu Dec 9 23:43:35 UTC 2021
The base64 decoder overwrites memory past the end of its output buffer in certain cases. It will not overwrite if the encoded string length is < 64 bytes. It also will not overwrite if the encoded string length mod 64 is >= 16. So the case where it *will* overwrite is when the input string length (the encoded byte length) mod 64 is less than 16.
I also added a test case to detect this overrun.
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Commit messages:
- Add buffer overrun check for decode
- Add masked write
Changes: https://git.openjdk.java.net/jdk/pull/6786/files
Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=6786&range=00
Issue: https://bugs.openjdk.java.net/browse/JDK-8273108
Stats: 12 lines in 2 files changed: 7 ins; 0 del; 5 mod
Patch: https://git.openjdk.java.net/jdk/pull/6786.diff
Fetch: git fetch https://git.openjdk.java.net/jdk pull/6786/head:pull/6786
PR: https://git.openjdk.java.net/jdk/pull/6786
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