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From: Tejun Heo <tj@kernel.org>
To: "zhidao su (Xiaomi)" <soolaugust@gmail.com>
Cc: David Vernet <void@manifault.com>,
	Andrea Righi <arighi@nvidia.com>,
	Changwoo Min <changwoo@igalia.com>,
	Ingo Molnar <mingo@redhat.com>,
	Peter Zijlstra <peterz@infradead.org>,
	Juri Lelli <juri.lelli@redhat.com>,
	Vincent Guittot <vincent.guittot@linaro.org>,
	Dietmar Eggemann <dietmar.eggemann@arm.com>,
	Steven Rostedt <rostedt@goodmis.org>,
	Ben Segall <bsegall@google.com>, Mel Gorman <mgorman@suse.de>,
	Valentin Schneider <vschneid@redhat.com>,
	K Prateek Nayak <kprateek.nayak@amd.com>,
	Shuah Khan <shuah@kernel.org>,
	Joel Fernandes <joelagnelf@nvidia.com>,
	Christian Loehle <christian.loehle@arm.com>,
	zhidao su <suzhidao@xiaomi.com>,
	Cheng-Yang Chou <yphbchou0911@gmail.com>,
	Zhao Mengmeng <zhaomengmeng@kylinos.cn>,
	Emil Tsalapatis <emil@etsalapatis.com>,
	linux-kernel@vger.kernel.org, sched-ext@lists.linux.dev,
	linux-kselftest@vger.kernel.org, bpf@vger.kernel.org
Subject: Re: [PATCH] sched_ext: Reject task setter kfuncs outside SCX contexts
Date: Wed, 01 Jul 2026 08:26:29 -1000	[thread overview]
Message-ID: <b5bb205febbb5d2220bd668d2fef5abe@kernel.org> (raw)
In-Reply-To: <20260701091954.384565-1-soolaugust@gmail.com>

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

      parent reply	other threads:[~2026-07-01 18:26 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-07-01  9:19 [PATCH] sched_ext: Reject task setter kfuncs outside SCX contexts zhidao su (Xiaomi)
2026-07-01 16:47 ` Andrea Righi
2026-07-01 18:26 ` Tejun Heo [this message]

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