On Tue, Aug 29, 2023 at 08:02:30PM +0200, Pablo Neira Ayuso wrote:
> On Tue, Aug 29, 2023 at 07:51:57PM +0200, Phil Sutter wrote:
> > Since set element reset is not integrated into nf_tables' transaction
> > logic, an explicit log call is needed, similar to NFT_MSG_GETOBJ_RESET
> > handling.
> >
> > For the sake of simplicity, catchall element reset will always generate
> > a dedicated log entry. This relieves nf_tables_dump_set() from having to
> > adjust the logged element count depending on whether a catchall element
> > was found or not.
> >
> > Cc: Richard Guy Briggs <r...@redhat.com>
> > Fixes: 079cd633219d7 ("netfilter: nf_tables: Introduce
> > NFT_MSG_GETSETELEM_RESET")
> > Signed-off-by: Phil Sutter <p...@nwl.cc>
> > ---
> > include/linux/audit.h | 1 +
> > kernel/auditsc.c | 1 +
> > net/netfilter/nf_tables_api.c | 31 ++++++++++++++++++++++++++++---
> > 3 files changed, 30 insertions(+), 3 deletions(-)
> >
> > diff --git a/include/linux/audit.h b/include/linux/audit.h
> > index 6a3a9e122bb5e..192bf03aacc52 100644
> > --- a/include/linux/audit.h
> > +++ b/include/linux/audit.h
> > @@ -117,6 +117,7 @@ enum audit_nfcfgop {
> > AUDIT_NFT_OP_OBJ_RESET,
> > AUDIT_NFT_OP_FLOWTABLE_REGISTER,
> > AUDIT_NFT_OP_FLOWTABLE_UNREGISTER,
> > + AUDIT_NFT_OP_SETELEM_RESET,
> > AUDIT_NFT_OP_INVALID,
> > };
> >
> > diff --git a/kernel/auditsc.c b/kernel/auditsc.c
> > index addeed3df15d3..38481e3181975 100644
> > --- a/kernel/auditsc.c
> > +++ b/kernel/auditsc.c
> > @@ -143,6 +143,7 @@ static const struct audit_nfcfgop_tab audit_nfcfgs[] = {
> > { AUDIT_NFT_OP_OBJ_RESET, "nft_reset_obj" },
> > { AUDIT_NFT_OP_FLOWTABLE_REGISTER, "nft_register_flowtable" },
> > { AUDIT_NFT_OP_FLOWTABLE_UNREGISTER, "nft_unregister_flowtable" },
> > + { AUDIT_NFT_OP_SETELEM_RESET, "nft_reset_setelem" },
> > { AUDIT_NFT_OP_INVALID, "nft_invalid" },
> > };
> >
> > diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c
> > index 1ddbdca4e47d6..a1218ea4e0c3d 100644
> > --- a/net/netfilter/nf_tables_api.c
> > +++ b/net/netfilter/nf_tables_api.c
> > @@ -102,6 +102,7 @@ static const u8 nft2audit_op[NFT_MSG_MAX] = { // enum
> > nf_tables_msg_types
> > [NFT_MSG_NEWFLOWTABLE] = AUDIT_NFT_OP_FLOWTABLE_REGISTER,
> > [NFT_MSG_GETFLOWTABLE] = AUDIT_NFT_OP_INVALID,
> > [NFT_MSG_DELFLOWTABLE] = AUDIT_NFT_OP_FLOWTABLE_UNREGISTER,
> > + [NFT_MSG_GETSETELEM_RESET] = AUDIT_NFT_OP_SETELEM_RESET,
> > };
> >
> > static void nft_validate_state_update(struct nft_table *table, u8
> > new_validate_state)
> > @@ -5661,13 +5662,25 @@ static int nf_tables_dump_setelem(const struct
> > nft_ctx *ctx,
> > return nf_tables_fill_setelem(args->skb, set, elem, args->reset);
> > }
> >
> > +static void audit_log_nft_set_reset(const struct nft_table *table,
> > + unsigned int base_seq,
> > + unsigned int nentries)
> > +{
> > + char *buf = kasprintf(GFP_ATOMIC, "%s:%u", table->name, base_seq);
>
> No check for NULL?
>
> I can see we have more like this in the tree.
Well, I merely copy-pasted that bit. (No excuse, I know.) The pointer is
passed on to audit_log_format() as a string argument and will end at
vsnprintf(), which detects and sanitizes NULL string args.
Cheers, Phil
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