linux-kernel - Re: [PATCH 1/3] stress-shm-sysv: exercise shmat with invalid flags

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Message-ID: <c867a2f8-5046-ce14-e36a-3d48780c317a@canonical.com>
Date:   Tue, 22 Sep 2020 09:16:49 +0100
From:   Colin Ian King <colin.king@...onical.com>
To:     Piyush Goyal <piyushgoyaliit@...il.com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org
Cc:     linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] stress-shm-sysv: exercise shmat with invalid flags

I believe these patches should have gone directly to me and not various
other folk.

Colin

On 22/09/2020 08:27, Piyush Goyal wrote:
> Exercise shmat syscall with invalid flags resulting in more kernel
> coverage.
> 
> Signed-off-by: Piyush Goyal <piyushgoyaliit@...il.com>
> ---
>  stress-shm-sysv.c | 14 ++++++++++++++
>  1 file changed, 14 insertions(+)
> 
> diff --git a/stress-shm-sysv.c b/stress-shm-sysv.c
> index aa03d718..5a3e0cc1 100644
> --- a/stress-shm-sysv.c
> +++ b/stress-shm-sysv.c
> @@ -128,6 +128,19 @@ static int stress_shm_sysv_check(
>  	return 0;
>  }
>  
> +/*
> + *  exercise_shmat()
> + *	exercise shmat syscall with all possible values of arguments
> + */
> +static void exercise_shmat(int shm_id)
> +{
> +	void *addr;
> +
> +	/* Exercise shmat syscall with invalid flags */
> +	addr = shmat(shm_id, NULL, ~0);
> +	(void)addr;
> +}
> +
>  #if defined(__linux__)
>  /*
>   *  stress_shm_get_procinfo()
> @@ -337,6 +350,7 @@ static int stress_shm_sysv_child(
>  				goto reap;
>  			}
>  
> +			exercise_shmat(shm_id);
>  			addr = shmat(shm_id, NULL, 0);
>  			if (addr == (char *) -1) {
>  				ok = false;
>