linux-kernel - Re: [Outreachy kernel] [PATCH v2] staging: android: Replace strcpy with strlcpy

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Message-ID: <alpine.DEB.2.20.1703112221270.2270@hadrien>
Date:   Sat, 11 Mar 2017 22:23:19 +0100 (CET)
From:   Julia Lawall <julia.lawall@...6.fr>
To:     simran singhal <singhalsimran0@...il.com>
cc:     gregkh@...uxfoundation.org, arve@...roid.com,
        riandrews@...roid.com, devel@...verdev.osuosl.org,
        linux-kernel@...r.kernel.org, outreachy-kernel@...glegroups.com
Subject: Re: [Outreachy kernel] [PATCH v2] staging: android: Replace strcpy
 with strlcpy



On Sun, 12 Mar 2017, 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>
> ---
>
>  v2:
>    -Correcting the place of the parenthesis
>
>  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 appears to be the old patch.

Actually, looking closer, I don't think this is right at all.  There seems
to be a goal of leaving some space at the beginning of asma->name.  So the
amount of space available for local_name would be computed using a
subtraction, not an addition.

julia

>
>  	mutex_unlock(&ashmem_mutex);
>  	return ret;
> --
> 2.7.4
>
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