Re: [PATCH] sched_ext: Reject task setter kfuncs outside SCX contexts

[Tejun Heo]

Hello, zhidao.

On Wed, Jul 01, 2026 at 05:19:54PM +0800, zhidao su (Xiaomi) wrote:
> As a result, a non-SCX tracing program can load after calling the task
> setter wrappers, reaching the mutator kfuncs outside an SCX scheduler
> context.

This is intended. A scheduler is conceptually the struct_ops plus the
accompanying BPF programs identified by the associated struct_ops, and these
operations are explicitly allowed for all of them. scx_prog_sched() and
scx_task_on_sched() confine each to tasks owned by its own scheduler, so this
isn't an escape from SCX context and there's nothing to reject.

Thanks.

--
tejun