rpi-kernel: disable CONFIG_BPF_JIT_ALWAYS_ON on 32-bit ARM#61582
Open
leahneukirchen wants to merge 1 commit into
Open
rpi-kernel: disable CONFIG_BPF_JIT_ALWAYS_ON on 32-bit ARM#61582leahneukirchen wants to merge 1 commit into
leahneukirchen wants to merge 1 commit into
Conversation
The BPF JIT for 32-bit ARM platforms has various issues with bigger filters, which are usually circumvented by falling back to the interpreter; however, our configuration prehibited that. Notably, the updated SECCOMP filter in OpenSSH 10.4 was too big and triggered the errno ENOTSUPP, which broke any login attempt. See https://patchew.org/linux/20250813152958.3107403-1-kafai.wan@linux.dev/20250813152958.3107403-3-kafai.wan@linux.dev/ for a discussion about the 32-bit ARM BPF JIT and its faults.
Member
Author
|
(For the record, neither RaspiOS nor Alpine enable the JIT at all for armv[67].) |
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Outdated suggestions cannot be applied.This suggestion has been applied or marked resolved.Suggestions cannot be applied from pending reviews.Suggestions cannot be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.
The BPF JIT for 32-bit ARM platforms has various issues with bigger filters, which are usually circumvented by falling back to the interpreter; however, our configuration prohibited that.
Notably, the updated SECCOMP filter in OpenSSH 10.4 was too big and triggered the errno ENOTSUPP, which broke any login attempt.
See
https://patchew.org/linux/20250813152958.3107403-1-kafai.wan@linux.dev/20250813152958.3107403-3-kafai.wan@linux.dev/ for a discussion about the 32-bit ARM BPF JIT and its faults.
Testing the changes
Fixes #61578.