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charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: ltp-bounces+ltp=archiver.kernel.org@lists.linux.it Sender: "ltp" From: Andrea Cervesato Test KEYCTL_DESCRIBE when called with a NULL buffer and buflen 0: verify the call succeeds and returns the full description length without writing to userspace memory. Signed-off-by: Andrea Cervesato --- runtest/syscalls | 1 + testcases/kernel/syscalls/keyctl/.gitignore | 1 + testcases/kernel/syscalls/keyctl/keyctl13.c | 46 +++++++++++++++++++++++++++++ 3 files changed, 48 insertions(+) diff --git a/runtest/syscalls b/runtest/syscalls index d8e846e65..25367084d 100644 --- a/runtest/syscalls +++ b/runtest/syscalls @@ -730,6 +730,7 @@ keyctl09 keyctl09 keyctl10 keyctl10 keyctl11 keyctl11 keyctl12 keyctl12 +keyctl13 keyctl13 kcmp01 kcmp01 kcmp02 kcmp02 diff --git a/testcases/kernel/syscalls/keyctl/.gitignore b/testcases/kernel/syscalls/keyctl/.gitignore index 9ce6e2250..d4ce61a6e 100644 --- a/testcases/kernel/syscalls/keyctl/.gitignore +++ b/testcases/kernel/syscalls/keyctl/.gitignore @@ -10,3 +10,4 @@ /keyctl10 /keyctl11 /keyctl12 +/keyctl13 diff --git a/testcases/kernel/syscalls/keyctl/keyctl13.c b/testcases/kernel/syscalls/keyctl/keyctl13.c new file mode 100644 index 000000000..ebdb3cf32 --- /dev/null +++ b/testcases/kernel/syscalls/keyctl/keyctl13.c @@ -0,0 +1,46 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Copyright (c) 2026 Andrea Cervesato + */ + +/*\ + * Test ``KEYCTL_DESCRIBE`` of :manpage:`keyctl(2)` with NULL buffer and buflen 0. + * + * [Algorithm] + * + * - describe a key with NULL buffer and ``buflen = 0``, verify the full length + * is returned without writing + */ + +#include +#include + +#include "keyctl_common.h" + +static key_serial_t key; + +static void setup(void) +{ + SAFE_KEYCTL(KEYCTL_JOIN_SESSION_KEYRING, 0, 0, 0, 0); + + key = new_user_key("k", "payload", 7, KEY_SPEC_PROCESS_KEYRING); + SAFE_KEYCTL(KEYCTL_SETPERM, key, KEY_PERM_SET, 0, 0); +} + +static void run(void) +{ + char expected[64]; + long expected_len; + + expected_len = snprintf(expected, sizeof(expected), + "user;%u;%u;%08x;k", + getuid(), getgid(), KEY_PERM_SET) + 1; + + TST_EXP_VAL(keyctl(KEYCTL_DESCRIBE, key, (unsigned long)NULL, 0, 0), + expected_len); +} + +static struct tst_test test = { + .setup = setup, + .test_all = run, +}; -- 2.51.0 -- Mailing list info: https://lists.linux.it/listinfo/ltp