[codex] security: allow absent usercopy default symbol#65
Merged
Jess Sullivan (Jesssullivan) merged 1 commit intoMay 9, 2026
Merged
Conversation
This was referenced May 9, 2026
Jess Sullivan (Jesssullivan)
deleted the
codex/security-check-usercopy-default
branch
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
1 participant
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Outdated suggestions cannot be applied.This suggestion has been applied or marked resolved.Suggestions cannot be applied from pending reviews.Suggestions cannot be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.
Summary
CONFIG_HARDENED_USERCOPY_DEFAULT_ON=yonly when that symbol exists in the target kernel Kconfig.CONFIG_HARDENED_USERCOPY=ymandatory, so the 6.12 fallback lane still carries the hardening option available in that branch.Validation
bash -n xr/scripts/check-security-config.sh xr/scripts/build-rpm.sh xr/scripts/check-kernel-carry.sh xr/scripts/generate-cadence-report.shbash xr/scripts/check-security-config.sh xr/config/base.configbash xr/scripts/check-security-config.sh /tmp/linux-xr-security-no-usercopy-default.configgit diff --checknix flake check --system x86_64-linuxNotes
The 6.12.87 proof after PR #64 passed patching and the firmware-loader helper guard, then failed because
CONFIG_HARDENED_USERCOPY_DEFAULT_ONis absent from 6.12 Kconfig. This keeps the checker strict on kernels that expose the symbol while accepting older kernels whereCONFIG_HARDENED_USERCOPY=yis the available guard.