linux-hardening - Re: [PATCH] i2c: Replace all non-returning strlcpy with strscpy

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Date:   Tue, 23 May 2023 10:05:40 +0100
From:   Lee Jones <lee@...nel.org>
To:     Azeem Shaikh <azeemshaikh38@...il.com>
Cc:     Sakari Ailus <sakari.ailus@....fi>,
        linux-hardening@...r.kernel.org, linux-leds@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Pavel Machek <pavel@....cz>
Subject: Re: [PATCH] i2c: Replace all non-returning strlcpy with strscpy

On Tue, 23 May 2023, Azeem Shaikh wrote:

> strlcpy() reads the entire source buffer first.
> This read may exceed the destination size limit.
> This is both inefficient and can lead to linear read
> overflows if a source string is not NUL-terminated [1].
> In an effort to remove strlcpy() completely [2], replace
> strlcpy() here with strscpy().
> No return values were used, so direct replacement is safe.
> 
> [1] https://www.kernel.org/doc/html/latest/process/deprecated.html#strlcpy
> [2] https://github.com/KSPP/linux/issues/89
> 
> Signed-off-by: Azeem Shaikh <azeemshaikh38@...il.com>
> ---
>  drivers/leds/flash/leds-as3645a.c |    4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)

Please resubmit, taking the time to check the subject line please.

> diff --git a/drivers/leds/flash/leds-as3645a.c b/drivers/leds/flash/leds-as3645a.c
> index bb2249771acb..7dc574b18f5f 100644
> --- a/drivers/leds/flash/leds-as3645a.c
> +++ b/drivers/leds/flash/leds-as3645a.c
> @@ -651,8 +651,8 @@ static int as3645a_v4l2_setup(struct as3645a *flash)
>  		},
>  	};
>  
> -	strlcpy(cfg.dev_name, led->dev->kobj.name, sizeof(cfg.dev_name));
> -	strlcpy(cfgind.dev_name, flash->iled_cdev.dev->kobj.name,
> +	strscpy(cfg.dev_name, led->dev->kobj.name, sizeof(cfg.dev_name));
> +	strscpy(cfgind.dev_name, flash->iled_cdev.dev->kobj.name,
>  		sizeof(cfgind.dev_name));
>  
>  	flash->vf = v4l2_flash_init(
> 

-- 
Lee Jones [李琼斯]