Bug ID: JDK-8289046 Undefined Behaviour in x86 class Assembler

JDK-8289046 : Undefined Behaviour in x86 class Assembler

Type: Bug
Component: hotspot
Sub-Component: compiler
Affected Version: 8,11,17,18,19,20

Priority: P4
Status: Resolved
Resolution: Fixed
OS: generic
CPU: x86

Submitted: 2022-06-23
Updated: 2022-08-04
Resolved: 2022-08-01

Versions (Unresolved/Resolved/Fixed)

The Version table provides details related to the release that this issue/RFE will be addressed.

Unresolved : Release in which this issue/RFE will be addressed.
Resolved: Release in which this issue/RFE has been resolved.
Fixed : Release in which this issue/RFE has been fixed. The release containing this fix may be available for download as an Early Access Release or a General Availability Release.

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JDK 20
20 b09Fixed

Related Reports

Blocks :	JDK-8289049 - x86_32 build fails with GCC 11 due to newString646_US warning
Duplicate :	JDK-8289002 - Minimal x86_64 VM build fails with GCC 11: 'this' pointer is null
Relates :	JDK-8276563 - Undefined Behaviour in class Assembler
Relates :	JDK-8291895 - Remove PRAGMA_NONNULL_IGNORED from x86 and AArch64
Relates :	JDK-8289060 - Undefined Behaviour in class VMReg

Description

All instances of type Register exhibit UB in the form of wild pointer (including null pointer) dereferences. This isn't very hard to fix: we should make Registers pointers to something rather than aliases of small integers.

JDK-8276563 fixed this for Aarch64 while this bug should fix it for x86.

Comments

Changeset: 86ef7b20 Author: Andrew Haley <aph@openjdk.org> Date: 2022-08-01 08:57:49 +0000 URL: https://git.openjdk.org/jdk/commit/86ef7b20eb45899a91cf9ee83f723336c9477694

01-08-2022

A pull request was submitted for review. URL: https://git.openjdk.org/jdk/pull/9261 Date: 2022-06-23 14:52:54 +0000

23-06-2022

ILW = Same as JDK-8276563 = P4

23-06-2022