ACK: [SRU][F][PATCH 0/2] CVE-2024-27019

[Thibault Ferrante]

On 28-06-2024 18:38, Bethany Jamison wrote:
> [Impact]
> 
> netfilter: nf_tables: Fix potential data-race in __nft_obj_type_get()
> 
> nft_unregister_obj() can concurrent with __nft_obj_type_get(),
> and there is not any protection when iterate over nf_tables_objects
> list in __nft_obj_type_get(). Therefore, there is potential data-race
> of nf_tables_objects list entry.
> 
> Use list_for_each_entry_rcu() to iterate over nf_tables_objects
> list in __nft_obj_type_get(), and use rcu_read_lock() in the caller
> nft_obj_type_get() to protect the entire type query process.
> 
> [Fix]
> 
> Noble:	pending
> Jammy:	pending
> Focal: 	Backport prereq commit - ignore neighboring line context
> 	conflict, Clean cherry-pick for fix commit
> Bionic:	needed
> Xenial:	not affected
> Trusty:	not affected
> 
> [Test Case]
> 
> Compile and boot tested
> 
> [Where problems could occur]
> 
> This fix affects those who use the netfilter framework, an issue with
> this fix would be visible to the user via unexpected system behavior
> or a system crash.
> 
> Pablo Neira Ayuso (1):
>    netfilter: nf_tables: restrict tunnel object to NFPROTO_NETDEV
> 
> Ziyang Xuan (1):
>    netfilter: nf_tables: Fix potential data-race in __nft_obj_type_get()
> 
>   include/net/netfilter/nf_tables.h |  2 ++
>   net/netfilter/nf_tables_api.c     | 22 +++++++++++++++-------
>   net/netfilter/nft_tunnel.c        |  1 +
>   3 files changed, 18 insertions(+), 7 deletions(-)
> 

Acked-by: Thibault Ferrante <thibault.ferrante at canonical.com>

--
Thibault