linux-kernel - Re: [PATCH v2 03/12] task_isolation: userspace hard isolation from kernel

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Message-ID: <CAApg2=ThxqOj8a2uZbRVgXZFjHWHk9g_xY3eseobQWwHLxiREg@mail.gmail.com>
Date:   Fri, 27 Mar 2020 09:42:55 +0100
From:   Marta Rybczynska <rybczynska@...il.com>
To:     Alex Belits <abelits@...vell.com>
Cc:     "frederic@...nel.org" <frederic@...nel.org>,
        "rostedt@...dmis.org" <rostedt@...dmis.org>,
        "mingo@...nel.org" <mingo@...nel.org>,
        "peterz@...radead.org" <peterz@...radead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Prasun Kapoor <pkapoor@...vell.com>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "linux-api@...r.kernel.org" <linux-api@...r.kernel.org>,
        "catalin.marinas@....com" <catalin.marinas@....com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "linux-arch@...r.kernel.org" <linux-arch@...r.kernel.org>,
        "will@...nel.org" <will@...nel.org>
Subject: Re: [PATCH v2 03/12] task_isolation: userspace hard isolation from kernel

On Sun, Mar 8, 2020 at 4:48 AM Alex Belits <abelits@...vell.com> wrote:
> +/* Enable task_isolation mode for TASK_ISOLATION kernels. */
> +#define PR_TASK_ISOLATION              48
> +# define PR_TASK_ISOLATION_ENABLE      (1 << 0)
> +# define PR_TASK_ISOLATION_SET_SIG(sig)        (((sig) & 0x7f) << 8)
> +# define PR_TASK_ISOLATION_GET_SIG(bits) (((bits) >> 8) & 0x7f)
> +
Thank you for resurrecting this code!

I have a question on the UAPI: the example code is using
PR_TASK_ISOLATION_USERSIG and it seems to be removed from this
version.

To enable isolation with SIGUSR1 the task should run:
prctl(PR_SET_TASK_ISOLATION, PR_TASK_ISOLATION_ENABLE
    | PR_TASK_ISOLATION_SET_SIG(SIGUSR1), 0, 0, 0);

And to disable:
prctl(PR_SET_TASK_ISOLATION, 0, 0, 0, 0);

Is this correct?
Marta