syz-extract-constants

To extract kernel constants for syzkaller syzlang descriptions, use the syz-extract tool to pull ioctl numbers and flag values from kernel headers, or manually define a .const file to pin values per architecture when sources are unavailable.

The best way to define syzlang constants without kernel sources is creating a manual .const file alongside your syzlang description, which pins constant values per architecture and ensures consistency across targets without requiring header access.

Yes, syz-extract can pull ioctl numbers and kernel constant values across multiple descriptions and targets, enforcing naming conventions and integrating with syzkaller builds to support accurate fuzzing across architectures.

Syzkaller programs fail with invalid ioctl numbers when kernel constants are inaccurate. This skill automates extraction and definition of these constants from kernel headers, ensuring valid syzkaller programs across multiple targets.

Use a manual .const file when kernel sources are unavailable, or run syz-extract when sources are accessible to pull values directly from kernel headers and integrate them into syzkaller task descriptions.