linux-kernel - Re: [PATCH 3/3] ptrace,syscall_user_dispatch: add a getter/setter for sud configuration

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Date:   Mon, 23 Jan 2023 16:41:02 +0100
From:   Oleg Nesterov <oleg@...hat.com>
To:     Gregory Price <gourry.memverge@...il.com>
Cc:     linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-doc@...r.kernel.org, linux-kselftest@...r.kernel.org,
        krisman@...labora.com, tglx@...utronix.de, luto@...nel.org,
        peterz@...radead.org, ebiederm@...ssion.com,
        akpm@...ux-foundation.org, adobriyan@...il.com, corbet@....net,
        shuah@...nel.org, Gregory Price <gregory.price@...verge.com>
Subject: Re: [PATCH 3/3] ptrace,syscall_user_dispatch: add a getter/setter
 for sud configuration

On 01/22, Gregory Price wrote:
>
> +int syscall_user_dispatch_get_config(struct task_struct *task, unsigned long size,
> +		void __user *data)
> +{
> +	struct syscall_user_dispatch *sd = &task->syscall_dispatch;
> +	struct syscall_user_dispatch_config config;
> +
> +	if (size != sizeof(struct syscall_user_dispatch_config))
> +		return -EINVAL;
> +
> +	if (test_syscall_work(SYSCALL_USER_DISPATCH))
> +		config.mode = PR_SYS_DISPATCH_ON;
> +	else
> +		config.mode = PR_SYS_DISPATCH_OFF;

Stupid question...

Why do we need 2/3 (which reports SYSCALL_USER_DISPATCH in proc/pid/status) then?

Oleg.