linux-kernel - Re: [PATCH v2 2/2] libsepol: Support functionfs

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Message-ID: <CAEjxPJ7Uy5szo0SJ94vjrtY9bQau8JvouLuP0x6rPogNQbTGPg@mail.gmail.com>
Date: Thu, 28 Aug 2025 09:13:32 -0400
From: Stephen Smalley <stephen.smalley.work@...il.com>
To: Neill Kapron <nkapron@...gle.com>
Cc: Paul Moore <paul@...l-moore.com>, Ondrej Mosnacek <omosnace@...hat.com>, kernel-team@...roid.com, 
	linux-kernel@...r.kernel.org, selinux@...r.kernel.org
Subject: Re: [PATCH v2 2/2] libsepol: Support functionfs_seclabel policycap

On Wed, Aug 27, 2025 at 6:22 PM Neill Kapron <nkapron@...gle.com> wrote:
>
> This adds the necessary userspace pieces to support the
> functionfs_seclabel policycap which enables per-file labels in
> functionfs and the ability for userspace to apply the labels.
>
> With the policycap disabled, legacy behaviors are maintained and
> per-file labeling is disallowed.
>
> Signed-off-by: Neill Kapron <nkapron@...gle.com>

Just a note for other SELinux userspace maintainers: we need to
de-conflict the currently pending 3 kernel patches each trying to
claim the next available policy capability bit so don't merge any of
the libsepol patches until that gets resolved please.


> ---
>  libsepol/include/sepol/policydb/polcaps.h | 1 +
>  libsepol/src/polcaps.c                    | 1 +
>  2 files changed, 2 insertions(+)
>
> diff --git a/libsepol/include/sepol/policydb/polcaps.h b/libsepol/include/sepol/policydb/polcaps.h
> index 0835ea21..bbaebf1a 100644
> --- a/libsepol/include/sepol/policydb/polcaps.h
> +++ b/libsepol/include/sepol/policydb/polcaps.h
> @@ -19,6 +19,7 @@ enum {
>         POLICYDB_CAP_NETLINK_XPERM,
>         POLICYDB_CAP_NETIF_WILDCARD,
>         POLICYDB_CAP_GENFS_SECLABEL_WILDCARD,
> +       POLICYDB_CAP_FUNCTIONFS_SECLABEL,
>         __POLICYDB_CAP_MAX
>  };
>  #define POLICYDB_CAP_MAX (__POLICYDB_CAP_MAX - 1)
> diff --git a/libsepol/src/polcaps.c b/libsepol/src/polcaps.c
> index 7ac0ae7c..83eb6143 100644
> --- a/libsepol/src/polcaps.c
> +++ b/libsepol/src/polcaps.c
> @@ -18,6 +18,7 @@ static const char * const polcap_names[POLICYDB_CAP_MAX + 1] = {
>         [POLICYDB_CAP_NETLINK_XPERM]                    = "netlink_xperm",
>         [POLICYDB_CAP_NETIF_WILDCARD]                   = "netif_wildcard",
>         [POLICYDB_CAP_GENFS_SECLABEL_WILDCARD]          = "genfs_seclabel_wildcard",
> +       [POLICYDB_CAP_FUNCTIONFS_SECLABEL]              = "functionfs_seclabel",
>  };
>
>  int sepol_polcap_getnum(const char *name)
> --
> 2.51.0.318.gd7df087d1a-goog
>