8294509: The sign extension bug applies to 'public static int[] convertSeedBytesToInts(byte[] seed, int n, int z)' in RandomSupport

[dtmhuang]

Backport for RandomSupport issue. There is a loss of information when using convertSeedBytesToLongs() with a bad seed, causing a lot of the original bytes to be overwritten by 1s. The fix involves using a bitwise AND with the seed before distributing the seed bytes into the result.

Clean backport, ran GHA sanity checks and locally tested tier1, tier2.

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Progress

• Change must be properly reviewed (1 review required, with at least 1 Reviewer)
• Change must not contain extraneous whitespace
• Commit message must refer to an issue
• JDK-8294509 needs maintainer approval

Issue

• JDK-8294509: The sign extension bug applies to 'public static int[] convertSeedBytesToInts(byte[] seed, int n, int z)' in RandomSupport (Bug - P4) ⚠️ Issue is already resolved. Consider making this a "backport pull request" by setting the PR title to Backport <hash> with the hash of the original commit. See Backports.

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[bridgekeeper]

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[openjdk]

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[mlbridge]

Webrevs

• 00: Full (056110a5)

[openjdk]

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