[LTP] [PATCH v2 06/33] keyctl14: Negative tests for KEYCTL_DESCRIBE

[Andrea Cervesato]

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

Test error conditions of KEYCTL_DESCRIBE using a parameterized
tcase table: verify ENOKEY on a bogus key id and EACCES when View
permission is missing.

Signed-off-by: Andrea Cervesato <andrea.cervesato@suse.com>
---
 runtest/syscalls                            |  1 +
 testcases/kernel/syscalls/keyctl/.gitignore |  1 +
 testcases/kernel/syscalls/keyctl/keyctl14.c | 54 +++++++++++++++++++++++++++++
 3 files changed, 56 insertions(+)

diff --git a/runtest/syscalls b/runtest/syscalls
index 25367084d..160d2f798 100644
--- a/runtest/syscalls
+++ b/runtest/syscalls
@@ -731,6 +731,7 @@ keyctl10 keyctl10
 keyctl11 keyctl11
 keyctl12 keyctl12
 keyctl13 keyctl13
+keyctl14 keyctl14
 
 kcmp01 kcmp01
 kcmp02 kcmp02
diff --git a/testcases/kernel/syscalls/keyctl/.gitignore b/testcases/kernel/syscalls/keyctl/.gitignore
index d4ce61a6e..8120454d8 100644
--- a/testcases/kernel/syscalls/keyctl/.gitignore
+++ b/testcases/kernel/syscalls/keyctl/.gitignore
@@ -11,3 +11,4 @@
 /keyctl11
 /keyctl12
 /keyctl13
+/keyctl14
diff --git a/testcases/kernel/syscalls/keyctl/keyctl14.c b/testcases/kernel/syscalls/keyctl/keyctl14.c
new file mode 100644
index 000000000..e98dde40f
--- /dev/null
+++ b/testcases/kernel/syscalls/keyctl/keyctl14.c
@@ -0,0 +1,54 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (c) 2026 Andrea Cervesato <andrea.cervesato@suse.com>
+ */
+
+/*\
+ * Negative test cases for ``KEYCTL_DESCRIBE`` of :manpage:`keyctl(2)`.
+ *
+ * [Algorithm]
+ *
+ * - describe with bogus key id fails with ``ENOKEY``
+ * - describe without View permission fails with ``EACCES``
+ */
+
+#include "keyctl_common.h"
+
+#define BUF_SIZE	64
+
+static key_serial_t key_no_view;
+static key_serial_t bogus_id = INT32_MAX;
+static char buf[BUF_SIZE];
+
+static struct tcase {
+	key_serial_t *keyid;
+	int exp_errno;
+	const char *desc;
+} tcases[] = {
+	{ &bogus_id, ENOKEY, "bogus key id" },
+	{ &key_no_view, EACCES, "key without View permission" },
+};
+
+static void setup(void)
+{
+	SAFE_KEYCTL(KEYCTL_JOIN_SESSION_KEYRING, 0, 0, 0, 0);
+
+	key_no_view = new_user_key("k_no_view", "payload", 7, KEY_SPEC_PROCESS_KEYRING);
+	SAFE_KEYCTL(KEYCTL_SETPERM, key_no_view, KEY_PERM_NO_VIEW, 0, 0);
+}
+
+static void verify_negative(unsigned int n)
+{
+	struct tcase *tc = &tcases[n];
+
+	TST_EXP_FAIL2(keyctl(KEYCTL_DESCRIBE, (unsigned long)*tc->keyid,
+			     (unsigned long)buf, sizeof(buf), 0),
+		      tc->exp_errno,
+		      "KEYCTL_DESCRIBE with %s", tc->desc);
+}
+
+static struct tst_test test = {
+	.setup = setup,
+	.test = verify_negative,
+	.tcnt = ARRAY_SIZE(tcases),
+};

-- 
2.51.0