Re: [PATCH] net: core: sock: fix information leak to userland

[Eric Dumazet <eric.dumazet@gmail.com>]

Le samedi 30 octobre 2010 à 18:26 +0400, Vasiliy Kulikov a écrit :
> "Address" variable might be not fully initialized in sock->ops->get_name().
> The only current implementation is get_name(), it leaves some padding
> fields of sockaddr_tipc uninitialized.  It leads to leaking of contents
> of kernel stack memory.
> 
> Signed-off-by: Vasiliy Kulikov <segooon@gmail.com>
> ---
>  Compile tested.
> 
>  net/core/sock.c |    1 +
>  1 files changed, 1 insertions(+), 0 deletions(-)
> 
> diff --git a/net/core/sock.c b/net/core/sock.c
> index 3eed542..759dd81 100644
> --- a/net/core/sock.c
> +++ b/net/core/sock.c
> @@ -930,6 +930,7 @@ int sock_getsockopt(struct socket *sock, int level, int optname,
>  	{
>  		char address[128];
>  
> +		memset(&address, 0, sizeof(address));
>  		if (sock->ops->getname(sock, (struct sockaddr *)address, &lv, 2))
>  			return -ENOTCONN;
>  		if (lv < len)

???

Please fix the real bug.