linux-kernel - Re: [PATCH v2 2/2] soc: qcom: rmtfs-mem: Make sysfs attributes world-readable

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Message-ID: <20181221220640.GC9704@minitux>
Date:   Fri, 21 Dec 2018 14:06:40 -0800
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Evan Green <evgreen@...omium.org>
Cc:     Andy Gross <andy.gross@...aro.org>,
        Brian Norris <briannorris@...omium.org>,
        Ben Chan <benchan@...omium.org>, linux-arm-msm@...r.kernel.org,
        David Brown <david.brown@...aro.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/2] soc: qcom: rmtfs-mem: Make sysfs attributes
 world-readable

On Fri 21 Dec 12:10 PST 2018, Evan Green wrote:

> In order to run an rmtfs daemon as an unprivileged user, that user would
> need access to the phys_addr and size sysfs attributes. Sharing these
> attributes with unprivileged users doesn't really leak anything
> sensitive, since if you have access to physical memory, the jig is
> up anyway.
> 
> Make those attributes readable by all.
> 
> Signed-off-by: Evan Green <evgreen@...omium.org>
> Reviewed-by: Brian Norris <briannorris@...omium.org>

Reviewed-by: Bjorn Andersson <bjorn.andersson@...aro.org>

Regards,
Bjorn

> ---
> 
> Changes in v2: None
> 
>  drivers/soc/qcom/rmtfs_mem.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/soc/qcom/rmtfs_mem.c b/drivers/soc/qcom/rmtfs_mem.c
> index 99a1363ece254..815c11aeceb93 100644
> --- a/drivers/soc/qcom/rmtfs_mem.c
> +++ b/drivers/soc/qcom/rmtfs_mem.c
> @@ -45,9 +45,9 @@ static ssize_t qcom_rmtfs_mem_show(struct device *dev,
>  			      struct device_attribute *attr,
>  			      char *buf);
>  
> -static DEVICE_ATTR(phys_addr, 0400, qcom_rmtfs_mem_show, NULL);
> -static DEVICE_ATTR(size, 0400, qcom_rmtfs_mem_show, NULL);
> -static DEVICE_ATTR(client_id, 0400, qcom_rmtfs_mem_show, NULL);
> +static DEVICE_ATTR(phys_addr, 0444, qcom_rmtfs_mem_show, NULL);
> +static DEVICE_ATTR(size, 0444, qcom_rmtfs_mem_show, NULL);
> +static DEVICE_ATTR(client_id, 0444, qcom_rmtfs_mem_show, NULL);
>  
>  static ssize_t qcom_rmtfs_mem_show(struct device *dev,
>  			      struct device_attribute *attr,
> -- 
> 2.18.1
>