net: ipv4: Use kfree_sensitive instead of kfree

[PATCH net v1] net: ipv4: Use kfree_sensitive instead of kfree

Posted by Wang Ming 2 years, 6 months ago

key might contain private part of the key, so better use
kfree_sensitive to free it.

Fixes: 38320c70d282 ("[IPSEC]: Use crypto_aead and authenc in ESP")
Signed-off-by: Wang Ming <machel@vivo.com>
---
 net/ipv4/esp4.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/ipv4/esp4.c b/net/ipv4/esp4.c
index ba06ed42e428..2be2d4922557 100644
--- a/net/ipv4/esp4.c
+++ b/net/ipv4/esp4.c
@@ -1132,7 +1132,7 @@ static int esp_init_authenc(struct xfrm_state *x,
 	err = crypto_aead_setkey(aead, key, keylen);
 
 free_key:
-	kfree(key);
+	kfree_sensitive(key);
 
 error:
 	return err;
-- 
2.25.1

Re: [PATCH net v1] net: ipv4: Use kfree_sensitive instead of kfree

Posted by Tariq Toukan 2 years, 6 months ago


On 17/07/2023 12:59, Wang Ming wrote:
> key might contain private part of the key, so better use
> kfree_sensitive to free it.
> 
> Fixes: 38320c70d282 ("[IPSEC]: Use crypto_aead and authenc in ESP")
> Signed-off-by: Wang Ming <machel@vivo.com>
> ---
>   net/ipv4/esp4.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/net/ipv4/esp4.c b/net/ipv4/esp4.c
> index ba06ed42e428..2be2d4922557 100644
> --- a/net/ipv4/esp4.c
> +++ b/net/ipv4/esp4.c
> @@ -1132,7 +1132,7 @@ static int esp_init_authenc(struct xfrm_state *x,
>   	err = crypto_aead_setkey(aead, key, keylen);
>   
>   free_key:
> -	kfree(key);
> +	kfree_sensitive(key);
>   
>   error:
>   	return err;

LGTM.
Reviewed-by: Tariq Toukan <tariqt@nvidia.com>

Re: [PATCH net v1] net: ipv4: Use kfree_sensitive instead of kfree

Posted by Kuniyuki Iwashima 2 years, 6 months ago

From: Wang Ming <machel@vivo.com>
Date: Mon, 17 Jul 2023 17:59:19 +0800
> key might contain private part of the key, so better use
> kfree_sensitive to free it.
> 
> Fixes: 38320c70d282 ("[IPSEC]: Use crypto_aead and authenc in ESP")
> Signed-off-by: Wang Ming <machel@vivo.com>

Reviewed-by: Kuniyuki Iwashima <kuniyu@amazon.com>


> ---
>  net/ipv4/esp4.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/net/ipv4/esp4.c b/net/ipv4/esp4.c
> index ba06ed42e428..2be2d4922557 100644
> --- a/net/ipv4/esp4.c
> +++ b/net/ipv4/esp4.c
> @@ -1132,7 +1132,7 @@ static int esp_init_authenc(struct xfrm_state *x,
>  	err = crypto_aead_setkey(aead, key, keylen);
>  
>  free_key:
> -	kfree(key);
> +	kfree_sensitive(key);
>  
>  error:
>  	return err;
> -- 
> 2.25.1