Repository navigation
Disable host PAC via C constructor in ARM64 cgo builds - #16911
Open
copybara-service[bot] wants to merge 1 commit into
Open
copybara-service[bot] wants to merge 1 commit into
copybara-service[bot] wants to merge 1 commit into
Conversation
copybara-service
Bot
force-pushed
the
test/cl1013107881
branch
3 times, most recently
from
November 6, 2026 01:35
f5eebdb to
f3e15fc
Compare
In cgo builds, syscall.AllThreadsSyscall6 is unsupported and returns ENOTSUP because libc manages thread creation and signal masks. In such cases use a simple work-around by introducing an ELF .init_array C constructor to disable PAC before the Go runtime or pthread spawns any threads. All subsequently cloned threads inherit the disabled PAC key state from the initial thread. New pkg is named cgoextras to denote it as a collection of such hacks. PiperOrigin-RevId: 1013107881
copybara-service
Bot
force-pushed
the
test/cl1013107881
branch
from
November 6, 2026 02:17
f3e15fc to
651c968
Compare
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
Add this suggestion to a batch that can be applied as a single commit.This suggestion is invalid because no changes were made to the code.Suggestions cannot be applied while the pull request is closed.Suggestions cannot be applied while viewing a subset of changes.Only one suggestion per line can be applied in a batch.Add this suggestion to a batch that can be applied as a single commit.Applying suggestions on deleted lines is not supported.You must change the existing code in this line in order to create a valid suggestion.Outdated suggestions cannot be applied.This suggestion has been applied or marked resolved.Suggestions cannot be applied from pending reviews.Suggestions cannot be applied on multi-line comments.Suggestions cannot be applied while the pull request is queued to merge.Suggestion cannot be applied right now. Please check back later.
Disable host PAC via C constructor in ARM64 cgo builds
In cgo builds, syscall.AllThreadsSyscall6 is unsupported and returns
ENOTSUP because libc manages thread creation and signal masks.
In such cases use a simple work-around by introducing an ELF .init_array C
constructor to disable PAC before the Go runtime or pthread spawns any
threads. All subsequently cloned threads inherit the disabled PAC key state
from the initial thread.
New pkg is named cgoextras to denote it as a collection of such hacks.