linux-kernel - Re: [PATCH 5/5] secmark: export secctx, drop secmark in procfs

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Date:	Tue, 12 Oct 2010 19:19:56 -0400
From:	Paul Moore <paul.moore@...com>
To:	Eric Paris <eparis@...hat.com>
Cc:	linux-kernel@...r.kernel.org, netfilter-devel@...r.kernel.org,
	netfilter@...r.kernel.org, jmorris@...ei.org,
	selinux@...ho.nsa.gov, sds@...ho.nsa.gov, jengelh@...ozas.de,
	linux-security-module@...r.kernel.org, mr.dash.four@...glemail.com,
	pablo@...filter.org
Subject: Re: [PATCH 5/5] secmark: export secctx, drop secmark in procfs

On Tue, 2010-10-12 at 11:40 -0400, Eric Paris wrote:
> The current secmark code exports a secmark= field which just indicates if
> there is special labeling on a packet or not.  We drop this field as it
> isn't particularly useful and instead export a new field secctx= which is
> the actual human readable text label.

Looks reasonable to me, just some small nits/questions below ...

> Signed-off-by: Eric Paris <eparis@...hat.com>
> ---
> 
>  .../netfilter/nf_conntrack_l3proto_ipv4_compat.c   |   27 ++++++++++++++++++--
>  net/netfilter/nf_conntrack_standalone.c            |   27 ++++++++++++++++++--
>  2 files changed, 48 insertions(+), 6 deletions(-)
> 
> diff --git a/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4_compat.c b/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4_compat.c
> index 244f7cb..2ca510e 100644
> --- a/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4_compat.c
> +++ b/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4_compat.c
> @@ -11,6 +11,7 @@
>  #include <linux/proc_fs.h>
>  #include <linux/seq_file.h>
>  #include <linux/percpu.h>
> +#include <linux/security.h>
>  #include <net/net_namespace.h>
>  
>  #include <linux/netfilter.h>
> @@ -87,6 +88,28 @@ static void ct_seq_stop(struct seq_file *s, void *v)
>  	rcu_read_unlock();
>  }
>  
> +#ifdef CONFIG_NF_CONNTRACK_SECMARK
> +static int ct_show_secctx(struct seq_file *s, const struct nf_conn *ct)
> +{
> +	int len, ret;
> +	char *secctx;
> +
> +	ret = security_secid_to_secctx(ct->secmark, &secctx, &len);

Here you define len as an int but the prototype calls for a u32 - is
this going to cause any compiler warnings?

> +	if (ret)
> +		return ret;
> +
> +	ret = seq_printf(s, "secctx=%s ", secctx);
> +
> +	security_release_secctx(secctx, len);
> +	return ret;
> +}
> +#else
> +static inline int ct_show_secctx(struct seq_file *s, const struct nf_conn *ct)
> +{
> +	return 0;
> +}
> +#endif
> +
>  static int ct_seq_show(struct seq_file *s, void *v)
>  {
>  	struct nf_conntrack_tuple_hash *hash = v;
> @@ -148,10 +171,8 @@ static int ct_seq_show(struct seq_file *s, void *v)
>  		goto release;
>  #endif
>  
> -#ifdef CONFIG_NF_CONNTRACK_SECMARK
> -	if (seq_printf(s, "secmark=%u ", ct->secmark))
> +	if (ct_show_secctx(s, ct))
>  		goto release;
> -#endif
>  
>  	if (seq_printf(s, "use=%u\n", atomic_read(&ct->ct_general.use)))
>  		goto release;
> diff --git a/net/netfilter/nf_conntrack_standalone.c b/net/netfilter/nf_conntrack_standalone.c
> index eb973fc..a6985da 100644
> --- a/net/netfilter/nf_conntrack_standalone.c
> +++ b/net/netfilter/nf_conntrack_standalone.c
> @@ -15,6 +15,7 @@
>  #include <linux/seq_file.h>
>  #include <linux/percpu.h>
>  #include <linux/netdevice.h>
> +#include <linux/security.h>
>  #include <net/net_namespace.h>
>  #ifdef CONFIG_SYSCTL
>  #include <linux/sysctl.h>
> @@ -108,6 +109,28 @@ static void ct_seq_stop(struct seq_file *s, void *v)
>  	rcu_read_unlock();
>  }
>  
> +#ifdef CONFIG_NF_CONNTRACK_SECMARK
> +static int ct_show_secctx(struct seq_file *s, const struct nf_conn *ct)
> +{
> +	int len, ret;
> +	char *secctx;
> +
> +	ret = security_secid_to_secctx(ct->secmark, &secctx, &len);

Same concern as above.

> +	if (ret)
> +		return ret;
> +
> +	ret = seq_printf(s, "secctx=%s ", secctx);
> +
> +	security_release_secctx(secctx, len);
> +	return ret;
> +}
> +#else
> +static inline int ct_show_secctx(struct seq_file *s, const struct nf_conn *ct)
> +{
> +	return 0;
> +}
> +#endif
> +
>  /* return 0 on success, 1 in case of error */
>  static int ct_seq_show(struct seq_file *s, void *v)
>  {
> @@ -168,10 +191,8 @@ static int ct_seq_show(struct seq_file *s, void *v)
>  		goto release;
>  #endif
>  
> -#ifdef CONFIG_NF_CONNTRACK_SECMARK
> -	if (seq_printf(s, "secmark=%u ", ct->secmark))
> +	if (ct_show_secctx(s, ct))
>  		goto release;
> -#endif
>  
>  #ifdef CONFIG_NF_CONNTRACK_ZONES
>  	if (seq_printf(s, "zone=%u ", nf_ct_zone(ct)))
> 

-- 
paul moore
linux @ hp


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