[PATCH v7 1/4] Landlock: Add abstract unix socket connect restriction
Mickaël Salaün
mic at digikod.net
Thu Jul 25 14:18:29 UTC 2024
On Wed, Jul 17, 2024 at 10:15:19PM -0600, Tahera Fahimi wrote:
> The patch introduces a new "scoped" attribute to the
> landlock_ruleset_attr that can specify "LANDLOCK_SCOPED_ABSTRACT_UNIX_SOCKET"
> to scope abstract unix sockets from connecting to a process outside of
> the same landlock domain.
>
> This patch implement two hooks, "unix_stream_connect" and "unix_may_send" to
> enforce this restriction.
>
> Signed-off-by: Tahera Fahimi <fahimitahera at gmail.com>
>
> -------
> diff --git a/security/landlock/syscalls.c b/security/landlock/syscalls.c
> index 03b470f5a85a..799a50f11d79 100644
> --- a/security/landlock/syscalls.c
> +++ b/security/landlock/syscalls.c
> @@ -97,8 +97,9 @@ static void build_check_abi(void)
> */
> ruleset_size = sizeof(ruleset_attr.handled_access_fs);
> ruleset_size += sizeof(ruleset_attr.handled_access_net);
> + ruleset_size += sizeof(ruleset_attr.scoped);
> BUILD_BUG_ON(sizeof(ruleset_attr) != ruleset_size);
> - BUILD_BUG_ON(sizeof(ruleset_attr) != 16);
> + BUILD_BUG_ON(sizeof(ruleset_attr) != 24);
>
> path_beneath_size = sizeof(path_beneath_attr.allowed_access);
> path_beneath_size += sizeof(path_beneath_attr.parent_fd);
> @@ -149,7 +150,7 @@ static const struct file_operations ruleset_fops = {
> .write = fop_dummy_write,
> };
>
> -#define LANDLOCK_ABI_VERSION 5
> +#define LANDLOCK_ABI_VERSION 6
>
> /**
> * sys_landlock_create_ruleset - Create a new ruleset
> @@ -170,7 +171,7 @@ static const struct file_operations ruleset_fops = {
> * Possible returned errors are:
> *
> * - %EOPNOTSUPP: Landlock is supported by the kernel but disabled at boot time;
> - * - %EINVAL: unknown @flags, or unknown access, or too small @size;
> + * - %EINVAL: unknown @flags, or unknown access, or uknown scope, or too small @size;
You'll need to rebase on top of my next branch to take into account
recent Günther's changes.
> * - %E2BIG or %EFAULT: @attr or @size inconsistencies;
> * - %ENOMSG: empty &landlock_ruleset_attr.handled_access_fs.
> */
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