netdev - Re: [PATCH net-next] selftests/tc-testing: replace mq with invalid parent ID

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Date: Wed, 31 May 2023 10:52:06 -0300
From: Pedro Tammela <pctammela@...atatu.com>
To: Zhengchao Shao <shaozhengchao@...wei.com>, netdev@...r.kernel.org,
 linux-kselftest@...r.kernel.org, jhs@...atatu.com, xiyou.wangcong@...il.com,
 jiri@...nulli.us, shuah@...nel.org
Cc: kuba@...nel.org, victor@...atatu.com, peilin.ye@...edance.com,
 weiyongjun1@...wei.com, yuehaibing@...wei.com
Subject: Re: [PATCH net-next] selftests/tc-testing: replace mq with invalid
 parent ID

On 31/05/2023 04:25, Zhengchao Shao wrote:
> The test case shown in [1] triggers the kernel to access the null pointer.
> Therefore, add related test cases to mq.
> The test results are as follows:
> 
> ./tdc.py -e 0531
> 1..1
> ok 1 0531 - Replace mq with invalid parent ID
> 
> ./tdc.py -c mq
> 1..8
> ok 1 ce7d - Add mq Qdisc to multi-queue device (4 queues)
> ok 2 2f82 - Add mq Qdisc to multi-queue device (256 queues)
> ok 3 c525 - Add duplicate mq Qdisc
> ok 4 128a - Delete nonexistent mq Qdisc
> ok 5 03a9 - Delete mq Qdisc twice
> ok 6 be0f - Add mq Qdisc to single-queue device
> ok 7 1023 - Show mq class
> ok 8 0531 - Replace mq with invalid parent ID
> 
> [1] https://lore.kernel.org/all/20230527093747.3583502-1-shaozhengchao@huawei.com/
> Signed-off-by: Zhengchao Shao <shaozhengchao@...wei.com>
> ---
>   .../tc-testing/tc-tests/qdiscs/mq.json        | 25 ++++++++++++++++++-
>   1 file changed, 24 insertions(+), 1 deletion(-)
> 
> diff --git a/tools/testing/selftests/tc-testing/tc-tests/qdiscs/mq.json b/tools/testing/selftests/tc-testing/tc-tests/qdiscs/mq.json
> index 44fbfc6caec7..ddd4a48bfe65 100644
> --- a/tools/testing/selftests/tc-testing/tc-tests/qdiscs/mq.json
> +++ b/tools/testing/selftests/tc-testing/tc-tests/qdiscs/mq.json
> @@ -155,5 +155,28 @@
>               "teardown": [
>                   "echo \"1\" > /sys/bus/netdevsim/del_device"
>               ]
> -        }
> +	},
> +	{
> +		"id": "0531",
> +		"name": "Replace mq with invalid parent ID",
> +		"category": [
> +			"qdisc",
> +			"mq"
> +		],
> +		"plugins": {
> +			"requires": "nsPlugin"
> +		},
> +		"setup": [
> +			"echo \"1 1 16\" > /sys/bus/netdevsim/new_device",
> +			"$TC qdisc add dev $ETH root handle ffff: mq"
> +		],
> +		"cmdUnderTest": "$TC qdisc replace dev $ETH parent ffff:fff1 handle ffff: mq",
> +		"expExitCode": "2",
> +		"verifyCmd": "$TC qdisc show dev $ETH",
> +		"matchPattern": "qdisc fq_codel 0: parent ffff",

The default qdisc could be pfifo_fast or some other qdisc depending on 
the config file
Perhaps it's better to match against:
"qdisc [a-zA-Z0-9_]+ 0: parent ffff"

> +		"matchCount": "16",
> +		"teardown": [
> +			"echo \"1\" > /sys/bus/netdevsim/del_device"
> +		]
> +	}
>   ]