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Sun, 01 Nov 2026 11:48:54 -0800 (PST) Received: from cachyos-x8664.hgw.local ([78.182.223.63]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-4aa8213ead6sm296179535e9.14.2026.11.01.11.48.53 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 01 Nov 2026 11:48:54 -0800 (PST) From: Muhammed Sariyildiz To: shuah@kernel.org Cc: linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH] selftests/ipc: Use IPC_STAT to get queue information Date: Sun, 1 Nov 2026 22:48:14 +0300 Message-ID: <20261101194814.188536-1-asiyee994@gmail.com> X-Mailer: git-send-email 2.56.0 X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit dump_queue() finds the message queue's stats by brute-forcing kernel indexes 0..255 with MSG_STAT and comparing the returned identifier with msgque->msq_id. This misses queues whose index is 256 or larger, and if no match is found the loop ends and the code goes on using a stale or uninitialized struct msqid_ds. The identifier is already known, so query it directly with IPC_STAT. This removes the loop and reports a failure if the queue cannot be queried. Signed-off-by: Muhammed Sariyildiz --- tools/testing/selftests/ipc/msgque.c | 18 +++++------------- 1 file changed, 5 insertions(+), 13 deletions(-) diff --git a/tools/testing/selftests/ipc/msgque.c b/tools/testing/selftests/ipc/msgque.c index 4b4c1ab..f4168c7 100644 --- a/tools/testing/selftests/ipc/msgque.c +++ b/tools/testing/selftests/ipc/msgque.c @@ -130,21 +130,13 @@ err: int dump_queue(struct msgque_data *msgque) { struct msqid_ds ds; - int kern_id; int i, ret; - for (kern_id = 0; kern_id < 256; kern_id++) { - ret = msgctl(kern_id, MSG_STAT, &ds); - if (ret < 0) { - if (errno == EINVAL) - continue; - ksft_test_result_fail("Failed to get stats for IPC queue with id %d\n", - kern_id); - return -errno; - } - - if (ret == msgque->msq_id) - break; + ret = msgctl(msgque->msq_id, IPC_STAT, &ds); + if (ret < 0) { + ksft_test_result_fail("Failed to get stats for IPC queue with id %d\n", + msgque->msq_id); + return -errno; } msgque->messages = malloc(sizeof(struct msg1) * ds.msg_qnum); -- 2.47.3