On Wed, Jun 24, 2020 at 08:34:23AM -0400, Richard Guy Briggs wrote:
> On 2020-06-24 12:03, Pablo Neira Ayuso wrote:
> > On Thu, Jun 04, 2020 at 09:20:49AM -0400, Richard Guy Briggs wrote:
[...]
> > > diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c
> > > index 3558e76e2733..b9e7440cc87d 100644
> > > --- a/net/netfilter/nf_tables_api.c
> > > +++ b/net/netfilter/nf_tables_api.c
> > > @@ -12,6 +12,7 @@
> > > #include <linux/netlink.h>
> > > #include <linux/vmalloc.h>
> > > #include <linux/rhashtable.h>
> > > +#include <linux/audit.h>
> > > #include <linux/netfilter.h>
> > > #include <linux/netfilter/nfnetlink.h>
> > > #include <linux/netfilter/nf_tables.h>
> > > @@ -693,6 +694,16 @@ static void nf_tables_table_notify(const struct nft_ctx *ctx, int event)
> > > {
> > > struct sk_buff *skb;
> > > int err;
> > > + char *buf = kasprintf(GFP_KERNEL, "%s:%llu;?:0",
> > > + ctx->table->name, ctx->table->handle);
> > > +
> > > + audit_log_nfcfg(buf,
> > > + ctx->family,
> > > + ctx->table->use,
> > > + event == NFT_MSG_NEWTABLE ?
> > > + AUDIT_NFT_OP_TABLE_REGISTER :
> > > + AUDIT_NFT_OP_TABLE_UNREGISTER);
> > > + kfree(buf);
> >
> > As a follow up: Would you wrap this code into a function?
> >
> > nft_table_audit()
> >
> > Same thing for other pieces of code below.
>
> If I'm guessing right, you are asking for a supplementary follow-up
> cleanup patch to this one (or are you nacking this patch)?
No nack, it's just that I'd prefer to see this wrapped in a function.
I think your patch is already in the audit tree.
> Also, I gather you would like to see the kasprintf and kfree hidden in
> nft_table_audit(), handing this function at least 8 parameters? This
> sounds pretty messy given the format of the table field.
I think you can pass ctx and the specific object, e.g. table, in most
cases? There is also event and the gfp_flags. That counts 4 here, but
maybe I'm overlooking something.
Thanks.
