linux-kernel - [PATCH v3] libsepol: Support functionfs

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Message-ID: <20250828170503.2323187-1-nkapron@google.com>
Date: Thu, 28 Aug 2025 17:05:01 +0000
From: Neill Kapron <nkapron@...gle.com>
To: Paul Moore <paul@...l-moore.com>, Stephen Smalley <stephen.smalley.work@...il.com>, 
	Ondrej Mosnacek <omosnace@...hat.com>
Cc: Neill Kapron <nkapron@...gle.com>, kernel-team@...roid.com, 
	linux-kernel@...r.kernel.org, selinux@...r.kernel.org
Subject: [PATCH v3] libsepol: Support functionfs_seclabel policycap

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>

Changes since v2:
- Sending as separate patches
---
 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