[LTP] [PATCH v2 28/33] keyctl34: Test KEYCTL_CAPABILITIES flag retrieval

[Andrea Cervesato]

From: Andrea Cervesato <andrea.cervesato@suse.com>

Test keyrings subsystem capabilities retrieval with KEYCTL_CAPABILITIES
and verify standard capability bits (CAPABILITIES, INVALIDATE,
RESTRICT_KEYRING, MOVE, NS_KEYRING_NAME, NS_KEY_TAG).

Signed-off-by: Andrea Cervesato <andrea.cervesato@suse.com>
---
 runtest/syscalls                            |  1 +
 testcases/kernel/syscalls/keyctl/.gitignore |  1 +
 testcases/kernel/syscalls/keyctl/keyctl34.c | 62 +++++++++++++++++++++++++++++
 3 files changed, 64 insertions(+)

diff --git a/runtest/syscalls b/runtest/syscalls
index 7658ac859..08877ff49 100644
--- a/runtest/syscalls
+++ b/runtest/syscalls
@@ -751,6 +751,7 @@ keyctl30 keyctl30
 keyctl31 keyctl31
 keyctl32 keyctl32
 keyctl33 keyctl33
+keyctl34 keyctl34
 
 kcmp01 kcmp01
 kcmp02 kcmp02
diff --git a/testcases/kernel/syscalls/keyctl/.gitignore b/testcases/kernel/syscalls/keyctl/.gitignore
index 0f209d7e0..f2ce330d7 100644
--- a/testcases/kernel/syscalls/keyctl/.gitignore
+++ b/testcases/kernel/syscalls/keyctl/.gitignore
@@ -31,3 +31,4 @@
 /keyctl31
 /keyctl32
 /keyctl33
+/keyctl34
diff --git a/testcases/kernel/syscalls/keyctl/keyctl34.c b/testcases/kernel/syscalls/keyctl/keyctl34.c
new file mode 100644
index 000000000..bfe15a6ed
--- /dev/null
+++ b/testcases/kernel/syscalls/keyctl/keyctl34.c
@@ -0,0 +1,62 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (c) 2026 Andrea Cervesato <andrea.cervesato@suse.com>
+ */
+
+/*\
+ * Test ``KEYCTL_CAPABILITIES`` of :manpage:`keyctl(2)`, added in Linux 5.3.
+ *
+ * ``KEYCTL_CAPABILITIES`` retrieves the bitmask of features and capabilities
+ * supported by the keyrings subsystem in the running kernel.
+ *
+ * [Algorithm]
+ *
+ * - retrieve keyrings subsystem capabilities into a buffer
+ * - verify return value is at least 2 bytes
+ * - verify standard capability bits ``KEYCTL_CAPS0_CAPABILITIES``,
+ *   ``KEYCTL_CAPS0_INVALIDATE``, ``KEYCTL_CAPS0_RESTRICT_KEYRING``,
+ *   ``KEYCTL_CAPS0_MOVE``, ``KEYCTL_CAPS1_NS_KEYRING_NAME``, and
+ *   ``KEYCTL_CAPS1_NS_KEY_TAG`` are set
+ */
+
+#include "keyctl_common.h"
+
+static unsigned char caps[8];
+
+static void run(void)
+{
+	memset(caps, 0, sizeof(caps));
+
+	TEST(keyctl(KEYCTL_CAPABILITIES, (unsigned long)caps, sizeof(caps), 0, 0));
+	if (TST_RET < 0)
+		tst_brk(TBROK | TTERRNO, "KEYCTL_CAPABILITIES failed");
+
+	if (TST_RET < 2) {
+		tst_res(TFAIL, "KEYCTL_CAPABILITIES returned %ld, expected at least 2",
+			TST_RET);
+		return;
+	}
+
+	TST_EXP_EXPR(caps[0] & KEYCTL_CAPS0_CAPABILITIES,
+		     "KEYCTL_CAPS0_CAPABILITIES is set");
+	TST_EXP_EXPR(caps[0] & KEYCTL_CAPS0_INVALIDATE,
+		     "KEYCTL_CAPS0_INVALIDATE is set");
+	TST_EXP_EXPR(caps[0] & KEYCTL_CAPS0_RESTRICT_KEYRING,
+		     "KEYCTL_CAPS0_RESTRICT_KEYRING is set");
+	TST_EXP_EXPR(caps[0] & KEYCTL_CAPS0_MOVE,
+		     "KEYCTL_CAPS0_MOVE is set");
+
+	TST_EXP_EXPR(caps[1] & KEYCTL_CAPS1_NS_KEYRING_NAME,
+		     "KEYCTL_CAPS1_NS_KEYRING_NAME is set");
+	TST_EXP_EXPR(caps[1] & KEYCTL_CAPS1_NS_KEY_TAG,
+		     "KEYCTL_CAPS1_NS_KEY_TAG is set");
+}
+
+static struct tst_test test = {
+	.test_all = run,
+	.min_kver = "5.3",
+	.needs_kconfigs = (const char *[]) {
+		"CONFIG_KEYS=y",
+		NULL
+	},
+};

-- 
2.51.0