netdev - Re: [PATCH iproute2 1/2] tipc: bail out if algname is abnormally long

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Date:   Mon, 3 May 2021 08:50:48 -0600
From:   David Ahern <dsahern@...il.com>
To:     Andrea Claudi <aclaudi@...hat.com>, netdev@...r.kernel.org,
        Tuong Lien <tuong.t.lien@...tech.com.au>
Cc:     stephen@...workplumber.org
Subject: Re: [PATCH iproute2 1/2] tipc: bail out if algname is abnormally long

[ cc author of Fixes commit ]

On 5/1/21 10:32 AM, Andrea Claudi wrote:
> tipc segfaults when called with an abnormally long algname:
> 
> $ tipc node set key 0x1234 algname supercalifragilistichespiralidososupercalifragilistichespiralidoso
> *** buffer overflow detected ***: terminated
> 
> Fix this returning an error if provided algname is longer than
> TIPC_AEAD_ALG_NAME.
> 
> Fixes: 24bee3bf9752 ("tipc: add new commands to set TIPC AEAD key")
> Signed-off-by: Andrea Claudi <aclaudi@...hat.com>
> ---
>  tipc/node.c | 9 +++++++--
>  1 file changed, 7 insertions(+), 2 deletions(-)
> 
> diff --git a/tipc/node.c b/tipc/node.c
> index ae75bfff..bf592a07 100644
> --- a/tipc/node.c
> +++ b/tipc/node.c
> @@ -236,10 +236,15 @@ get_ops:
>  
>  	/* Get algorithm name, default: "gcm(aes)" */
>  	opt_algname = get_opt(opts, "algname");
> -	if (!opt_algname)
> +	if (!opt_algname) {
>  		strcpy(input.key.alg_name, "gcm(aes)");
> -	else
> +	} else {
> +		if (strlen(opt_algname->val) > TIPC_AEAD_ALG_NAME) {
> +			fprintf(stderr, "error, invalid algname\n");
> +			return -EINVAL;
> +		}
>  		strcpy(input.key.alg_name, opt_algname->val);
> +	}
>  
>  	/* Get node identity */
>  	opt_nodeid = get_opt(opts, "nodeid");
>