linux-kernel - Re: [PATCH 18/24] Lock down module params that specify hardware parameters (eg. ioport)

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Date:   Wed, 11 Apr 2018 10:22:46 -0700
From:   Randy Dunlap <rdunlap@...radead.org>
To:     David Howells <dhowells@...hat.com>, torvalds@...ux-foundation.org
Cc:     linux-man@...r.kernel.org, linux-api@...r.kernel.org,
        jmorris@...ei.org, linux-kernel@...r.kernel.org,
        linux-security-module@...r.kernel.org
Subject: Re: [PATCH 18/24] Lock down module params that specify hardware
 parameters (eg. ioport)

On 04/11/2018 09:26 AM, David Howells wrote:
> Provided an annotation for module parameters that specify hardware
> parameters (such as io ports, iomem addresses, irqs, dma channels, fixed
> dma buffers and other types).
> 
> Suggested-by: Alan Cox <gnomes@...rguk.ukuu.org.uk>
> Signed-off-by: David Howells <dhowells@...hat.com>
> ---
> 
>  kernel/params.c |   26 +++++++++++++++++++++-----
>  1 file changed, 21 insertions(+), 5 deletions(-)
> 
> diff --git a/kernel/params.c b/kernel/params.c
> index cc9108c2a1fd..2c08c4aa376b 100644
> --- a/kernel/params.c
> +++ b/kernel/params.c
> @@ -108,13 +108,19 @@ bool parameq(const char *a, const char *b)
>  	return parameqn(a, b, strlen(a)+1);
>  }
>  
> -static void param_check_unsafe(const struct kernel_param *kp)
> +static bool param_check_unsafe(const struct kernel_param *kp,
> +			       const char *doing)
>  {
>  	if (kp->flags & KERNEL_PARAM_FL_UNSAFE) {
>  		pr_warn("Setting dangerous option %s - tainting kernel\n",
>  			kp->name);
>  		add_taint(TAINT_USER, LOCKDEP_STILL_OK);
>  	}
> +
> +	if (kp->flags & KERNEL_PARAM_FL_HWPARAM &&
> +	    kernel_is_locked_down("Command line-specified device addresses, irqs and dma channels"))

s/dma/DMA/

Other patches use PCI instead of pci, CIS instead of cis, MMIO instead of mmio,
BPF instead of bpf, MSR instead of msr, etc...


> +		return false;
> +	return true;
>  }
>  
>  static int parse_one(char *param,


-- 
~Randy