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

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Message-ID: <1288449350.2680.970.camel@edumazet-laptop>
Date:	Sat, 30 Oct 2010 16:35:50 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Vasiliy Kulikov <segooon@...il.com>
Cc:	kernel-janitors@...r.kernel.org,
	"David S. Miller" <davem@...emloft.net>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Herbert Xu <herbert@...dor.apana.org.au>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] net: core: sock: fix information leak to userland

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@...il.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.



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