linux-kernel - Re: [PATCH v4 7/9] parisc/perf: open access for CAP_SYS

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Message-ID: <00d0213a-dce8-45b1-1905-11ea4af2d207@gmx.de>
Date:   Mon, 27 Jan 2020 09:52:10 +0100
From:   Helge Deller <deller@....de>
To:     Alexey Budankov <alexey.budankov@...ux.intel.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Ingo Molnar <mingo@...hat.com>,
        "jani.nikula@...ux.intel.com" <jani.nikula@...ux.intel.com>,
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        "rodrigo.vivi@...el.com" <rodrigo.vivi@...el.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>,
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        <james.bottomley@...senpartnership.com>,
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Cc:     Jiri Olsa <jolsa@...hat.com>, Andi Kleen <ak@...ux.intel.com>,
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        linux-arm-kernel@...ts.infradead.org, oprofile-list@...ts.sf.net
Subject: Re: [PATCH v4 7/9] parisc/perf: open access for CAP_SYS_PERFMON
 privileged process

On 18.12.19 10:29, Alexey Budankov wrote:
>
> Open access to monitoring for CAP_SYS_PERFMON privileged processes.
> For backward compatibility reasons access to the monitoring remains open
> for CAP_SYS_ADMIN privileged processes but CAP_SYS_ADMIN usage for secure
> monitoring is discouraged with respect to CAP_SYS_PERFMON capability.
>
> Signed-off-by: Alexey Budankov <alexey.budankov@...ux.intel.com>

Acked-by: Helge Deller <deller@....de>

> ---
>  arch/parisc/kernel/perf.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/arch/parisc/kernel/perf.c b/arch/parisc/kernel/perf.c
> index 676683641d00..c4208d027794 100644
> --- a/arch/parisc/kernel/perf.c
> +++ b/arch/parisc/kernel/perf.c
> @@ -300,7 +300,7 @@ static ssize_t perf_write(struct file *file, const char __user *buf,
>  	else
>  		return -EFAULT;
>
> -	if (!capable(CAP_SYS_ADMIN))
> +	if (!perfmon_capable())
>  		return -EACCES;
>
>  	if (count != sizeof(uint32_t))
>