Re: [PATCH v16 1/3] lsm, selinux: Add setup_report permission to binder

Paul Moore
2025-03-07T21:47:39Z

On Mon, Mar 3, 2025 at 3:02 PM Li Li <dualli@chromium.org> wrote:
>
> From: Thiébaud Weksteen <tweek@google.com>
>
> Introduce a new permission "setup_report" to the "binder" class.
> This persmission controls the ability to set up the binder generic
> netlink driver to report certain binder transactions.
>
> Signed-off-by: Thiébaud Weksteen <tweek@google.com>
> Signed-off-by: Li Li <dualli@google.com>
> ---
> include/linux/lsm_hook_defs.h | 1 +
> include/linux/security.h | 6 ++++++
> security/security.c | 13 +++++++++++++
> security/selinux/hooks.c | 7 +++++++
> security/selinux/include/classmap.h | 3 ++-
> 5 files changed, 29 insertions(+), 1 deletion(-)

...

> diff --git a/security/security.c b/security/security.c
> index 8aa839232c73..382e3bbab215 100644
> --- a/security/security.c
> +++ b/security/security.c
> @@ -1043,6 +1043,19 @@ int security_binder_transfer_file(const struct cred *from,
> return call_int_hook(binder_transfer_file, from, to, file);
> }
>
> +/**
> + * security_binder_setup_report() - Check if process allowed to set up binder reports.

Please keep the line length in the LSM and SELinux code to 80
characters or less.

> diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
> index 0d958f38ff9f..2fafa8feafdf 100644
> --- a/security/selinux/hooks.c
> +++ b/security/selinux/hooks.c
> @@ -2092,6 +2092,12 @@ static int selinux_binder_transfer_file(const struct cred *from,
> &ad);
> }
>
> +static int selinux_binder_setup_report(const struct cred *to)
> +{
> + return avc_has_perm(current_sid(), cred_sid(to), SECCLASS_BINDER,
> + BINDER__SETUP_REPORT, NULL);
> +}

There should also be an associated patch{set} against the
selinux-testsuite to add tests for the binder/setup_report permission
introduced here. My apologies if you've already posted one, but I'm
looking now and I don't see anything either on the lists or on GH.

* https://github.com/SELinuxProject/selinux-testsuite

--
paul-moore.com