linux-kernel - Re: [PATCH] staging: android: Replace strcpy with strlcpy

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Message-ID: <20170313124144.GE4136@mwanda>
Date:   Mon, 13 Mar 2017 15:41:44 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     simran singhal <singhalsimran0@...il.com>
Cc:     gregkh@...uxfoundation.org, devel@...verdev.osuosl.org,
        outreachy-kernel@...glegroups.com, arve@...roid.com,
        riandrews@...roid.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] staging: android: Replace strcpy with strlcpy

On Sun, Mar 12, 2017 at 02:10:01AM +0530, simran singhal wrote:
> Replace strcpy with strlcpy as strcpy does not check for buffer
> overflow.
> This is found using Flawfinder.
> 
> Signed-off-by: simran singhal <singhalsimran0@...il.com>
> ---
>  drivers/staging/android/ashmem.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/staging/android/ashmem.c b/drivers/staging/android/ashmem.c
> index 7cbad0d..eb2f4ef 100644
> --- a/drivers/staging/android/ashmem.c
> +++ b/drivers/staging/android/ashmem.c
> @@ -548,7 +548,8 @@ static int set_name(struct ashmem_area *asma, void __user *name)
>  	if (unlikely(asma->file))
>  		ret = -EINVAL;
>  	else
> -		strcpy(asma->name + ASHMEM_NAME_PREFIX_LEN, local_name);
> +		strlcpy(asma->name + ASHMEM_NAME_PREFIX_LEN, local_name,
> +			sizeof(asma->name + ASHMEM_NAME_PREFIX_LEN));
                        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
This isn't right.

Also please do some analysis to see if it's a real bug or a false
positive.  It is a false positive in this case.

regards,
dan carpenter