[LTP] [PATCH v2 3/3] Add process_mrelease02 test

[Wei Gao]

On Mon, Aug 12, 2024 at 01:46:30PM +0200, Andrea Cervesato wrote:
> From: Andrea Cervesato <andrea.cervesato@suse.com>
> 
> This test verifies that process_mrelease() syscall correctly raises
> the errors.
> 
> Signed-off-by: Andrea Cervesato <andrea.cervesato@suse.com>
> ---
>  runtest/syscalls                                   |  1 +
>  .../kernel/syscalls/process_mrelease/.gitignore    |  1 +
>  .../syscalls/process_mrelease/process_mrelease02.c | 84 ++++++++++++++++++++++
>  3 files changed, 86 insertions(+)
> 
> diff --git a/runtest/syscalls b/runtest/syscalls
> index de90e9ba3..f3cb7d465 100644
> --- a/runtest/syscalls
> +++ b/runtest/syscalls
> @@ -1074,6 +1074,7 @@ preadv203_64 preadv203_64
>  profil01 profil01
>  
>  process_mrelease01 process_mrelease01
> +process_mrelease02 process_mrelease02
>  
>  process_vm_readv01 process_vm01 -r
>  process_vm_readv02 process_vm_readv02
> diff --git a/testcases/kernel/syscalls/process_mrelease/.gitignore b/testcases/kernel/syscalls/process_mrelease/.gitignore
> index 673983858..f1e7a8fea 100644
> --- a/testcases/kernel/syscalls/process_mrelease/.gitignore
> +++ b/testcases/kernel/syscalls/process_mrelease/.gitignore
> @@ -1 +1,2 @@
>  /process_mrelease01
> +/process_mrelease02
> diff --git a/testcases/kernel/syscalls/process_mrelease/process_mrelease02.c b/testcases/kernel/syscalls/process_mrelease/process_mrelease02.c
> new file mode 100644
> index 000000000..ced556243
> --- /dev/null
> +++ b/testcases/kernel/syscalls/process_mrelease/process_mrelease02.c
> @@ -0,0 +1,84 @@
> +// SPDX-License-Identifier: GPL-2.0-or-later
> +/*
> + * Copyright (C) 2024 SUSE LLC Andrea Cervesato <andrea.cervesato@suse.com>
> + */
> +
> +/*\
> + * [Description]
> + *
> + * This test verifies that process_mrelease() syscall is raising errors:
> + * * EBADF when a bad file descriptor is given
> + * * EINVAL when flags is not zero
> + * * EINVAL when memory of a task cannot be released because it's still running
> + * * ESRCH when child has been closed
> + */
> +
> +#include "tst_test.h"
> +#include "lapi/syscalls.h"
> +
> +static int badfd = -1;
> +static int pidfd;
> +
> +enum {
> +	NO_CHILD,
> +	EXIT_CHILD,
> +	WAIT_CHILD,
> +};
> +
> +static struct tcase {
> +	int child_type;
> +	int *fd;
> +	int flags;
> +	int exp_errno;
> +	char *msg;
> +} tcases[] = {
> +	{NO_CHILD, &badfd, 0, EBADF, "bad file descriptor"},
> +	{WAIT_CHILD, &pidfd, -1, EINVAL, "flags is not 0"},
> +	{WAIT_CHILD, &pidfd, 0, EINVAL, "task memory cannot be released"},
> +	{EXIT_CHILD, &pidfd, 0, ESRCH, "child is not running"},
> +};
> +
> +static void run(unsigned int n)
> +{
> +	struct tcase *tc = &tcases[n];
> +	int status;
> +
> +	if (tc->child_type != NO_CHILD) {
> +		pid_t pid;
> +
> +		pid = SAFE_FORK();
> +		if (!pid) {
> +			if (tc->child_type == WAIT_CHILD)
> +				TST_CHECKPOINT_WAIT(0);
> +
> +			exit(0);
> +		}
> +
> +		tst_res(TINFO, "Spawned waiting child with pid=%d", pid);
> +
> +		pidfd = SAFE_PIDFD_OPEN(pid, 0);
> +
> +		if (tc->child_type == EXIT_CHILD)
> +			SAFE_WAITPID(pid, &status, 0);
> +	}
> +
> +	TST_EXP_FAIL(tst_syscall(__NR_process_mrelease, *tc->fd, tc->flags),
> +		tc->exp_errno,
> +		"%s", tc->msg);
> +
> +	if (tc->child_type != NO_CHILD) {
> +		if (tc->child_type == WAIT_CHILD)
> +			TST_CHECKPOINT_WAKE(0);
> +
> +		SAFE_CLOSE(pidfd);
> +	}
> +}
> +
> +static struct tst_test test = {
> +	.test = run,
> +	.tcnt = ARRAY_SIZE(tcases),
> +	.needs_root = 1,
> +	.forks_child = 1,
> +	.min_kver = "5.15",

I suggest also using syscall check process_mrelease support or not like
kernel selftest. Such as:
        if (!syscall(__NR_process_mrelease, -1, 0) || errno != EBADF) {
                if (errno == ENOSYS) {
                        ksft_test_result_skip("process_mrelease not implemented\n");
                        ksft_finished();

> +	.needs_checkpoints = 1,
> +};
> 
> -- 
> 2.43.0
> 
> 
> -- 
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