deps: V8: cherry-pick 1158ae719749 - #64432
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Original commit message:
[wasm] Fix jump table slot overflow on x64 with CET enabled
JumpTableAssembler::EmitJumpSlot for x64 was advancing the PC before
checking if the target was reachable via a 32-bit displacement when CET
was enabled. This caused a slot overflow when the far-jump fallback was
triggered, as the second attempt to emit the slot would start at an
incorrect offset.
This CL ensures that the displacement check is performed before any
instructions are emitted, making the function side-effect-free on
failure. It also introduces kJumpTableSlotEntryMarkerSize to clarify
the displacement calculation, following the pattern used on ARM64.
Reported-by: Fabien Romano <fabienromano@gmail.com>
TAG=agy
R=jkummerow@chromium.org
Fixed: 532112743
Change-Id: Iaf6f15b51a66a45711e8556972ac0d353e6117c7
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/8063803
Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
Commit-Queue: Clemens Backes <clemensb@chromium.org>
Cr-Commit-Position: refs/heads/main@{#108556}
Refs: v8/v8@1158ae7
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Yes, albeit only on OpenBSD. With the diff applied manually, node 24.x builds and works (I can test node 26.x as well) |
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targos
approved these changes
Jul 14, 2026
richardlau
approved these changes
Jul 14, 2026
aduh95
pushed a commit
that referenced
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Jul 21, 2026
Original commit message:
[wasm] Fix jump table slot overflow on x64 with CET enabled
JumpTableAssembler::EmitJumpSlot for x64 was advancing the PC before
checking if the target was reachable via a 32-bit displacement when CET
was enabled. This caused a slot overflow when the far-jump fallback was
triggered, as the second attempt to emit the slot would start at an
incorrect offset.
This CL ensures that the displacement check is performed before any
instructions are emitted, making the function side-effect-free on
failure. It also introduces kJumpTableSlotEntryMarkerSize to clarify
the displacement calculation, following the pattern used on ARM64.
Reported-by: Fabien Romano <fabienromano@gmail.com>
TAG=agy
R=jkummerow@chromium.org
Fixed: 532112743
Change-Id: Iaf6f15b51a66a45711e8556972ac0d353e6117c7
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/8063803
Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
Commit-Queue: Clemens Backes <clemensb@chromium.org>
Cr-Commit-Position: refs/heads/main@{#108556}
Refs: v8/v8@1158ae7
PR-URL: #64432
Fixes: #64424
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Richard Lau <richard.lau@ibm.com>
aduh95
pushed a commit
that referenced
this pull request
Jul 21, 2026
Original commit message:
[wasm] Fix jump table slot overflow on x64 with CET enabled
JumpTableAssembler::EmitJumpSlot for x64 was advancing the PC before
checking if the target was reachable via a 32-bit displacement when CET
was enabled. This caused a slot overflow when the far-jump fallback was
triggered, as the second attempt to emit the slot would start at an
incorrect offset.
This CL ensures that the displacement check is performed before any
instructions are emitted, making the function side-effect-free on
failure. It also introduces kJumpTableSlotEntryMarkerSize to clarify
the displacement calculation, following the pattern used on ARM64.
Reported-by: Fabien Romano <fabienromano@gmail.com>
TAG=agy
R=jkummerow@chromium.org
Fixed: 532112743
Change-Id: Iaf6f15b51a66a45711e8556972ac0d353e6117c7
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/8063803
Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
Commit-Queue: Clemens Backes <clemensb@chromium.org>
Cr-Commit-Position: refs/heads/main@{#108556}
Refs: v8/v8@1158ae7
PR-URL: #64432
Fixes: #64424
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Richard Lau <richard.lau@ibm.com>
RafaelGSS
pushed a commit
that referenced
this pull request
Jul 29, 2026
Original commit message:
[wasm] Fix jump table slot overflow on x64 with CET enabled
JumpTableAssembler::EmitJumpSlot for x64 was advancing the PC before
checking if the target was reachable via a 32-bit displacement when CET
was enabled. This caused a slot overflow when the far-jump fallback was
triggered, as the second attempt to emit the slot would start at an
incorrect offset.
This CL ensures that the displacement check is performed before any
instructions are emitted, making the function side-effect-free on
failure. It also introduces kJumpTableSlotEntryMarkerSize to clarify
the displacement calculation, following the pattern used on ARM64.
Reported-by: Fabien Romano <fabienromano@gmail.com>
TAG=agy
R=jkummerow@chromium.org
Fixed: 532112743
Change-Id: Iaf6f15b51a66a45711e8556972ac0d353e6117c7
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/8063803
Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
Commit-Queue: Clemens Backes <clemensb@chromium.org>
Cr-Commit-Position: refs/heads/main@{#108556}
Refs: v8/v8@1158ae7
PR-URL: #64432
Fixes: #64424
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Richard Lau <richard.lau@ibm.com>
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Lands cleanly, and is zero-impact for standard (non-CET) builds.
@VlkrS: are you in a position to test a V8_ENABLE_CET_IBT build?
Fixes: #64424