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Subject: Re: [PATCH v3] debugfs: Add access restriction option
To:     Peter Enderborg <peter.enderborg@sony.com>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        linux-kernel@vger.kernel.org,
        "Rafael J . Wysocki" <rafael@kernel.org>,
        Andrew Morton <akpm@linux-foundation.org>,
        Jonathan Corbet <corbet@lwn.net>, linux-doc@vger.kernel.org
References: <20200617133738.6631-1-peter.enderborg@sony.com>
From:   Randy Dunlap <rdunlap@infradead.org>
Message-ID: <d6f02bd5-e92d-017b-9ac2-ffdcb4381c97@infradead.org>
Date:   Wed, 17 Jun 2020 08:10:26 -0700
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On 6/17/20 6:37 AM, Peter Enderborg wrote:
> diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
> index fb95fad81c79..249c86e53bb7 100644
> --- a/Documentation/admin-guide/kernel-parameters.txt
> +++ b/Documentation/admin-guide/kernel-parameters.txt
> @@ -827,6 +827,17 @@
>  			useful to also enable the page_owner functionality.
>  			on: enable the feature
>  
> +	debugfs=    	[KNL] When CONFIG_DEBUG_FS_RESTRICTED is set, this parameter
> +			enables what is exposed to userspace.
> +			Format: { on, no_fs, off }
> +			on: 	All functions are enabled.
> +			no_fs: 	Filesystem is not registered but kernel clients can
> +			        access APIs and a crashkernel can be used to read
> +				it's content. There its nothing to mount.

				its content. There is nothing to mount.


> +			off: 	(default) Filesystem is not registered and clients
> +			        get a -EPERM as result when trying to register files
> +				or directories within debugfs.
> +
>  	debugpat	[X86] Enable PAT debugging
>  
>  	decnet.addr=	[HW,NET]


-- 
~Randy