[PATCH v12 08/12] landlock: Add network rules and TCP hooks support

[Mickaël Salaün]

On Wed, Sep 20, 2023 at 05:26:36PM +0800, Konstantin Meskhidze wrote:
> This commit adds network rules support in the ruleset management
> helpers and the landlock_create_ruleset syscall.
> Refactor user space API to support network actions. Add new network
> access flags, network rule and network attributes. Increment Landlock
> ABI version. Expand access_masks_t to u32 to be sure network access
> rights can be stored. Implement socket_bind() and socket_connect()
> LSM hooks, which enables to restrict TCP socket binding and connection
> to specific ports.
> The new landlock_net_port_attr structure has two fields. The allowed_access
> field contains the LANDLOCK_ACCESS_NET_* rights. The port field contains
> the port value according to the allowed protocol. This field can
> take up to a 64-bit value [1] but the maximum value depends on the related
> protocol (e.g. 16-bit for TCP).
> 
> [1]
> https://lore.kernel.org/r/278ab07f-7583-a4e0-3d37-1bacd091531d@digikod.net

Could you please include here the rationale to not tie access rights to
sockets' file descriptor, and link [2]?

[2] https://lore.kernel.org/r/263c1eb3-602f-57fe-8450-3f138581bee7@digikod.net