xref: /third_party/ltp/testcases/kernel/mem/hugetlb/hugeshmctl/hugeshmctl02.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Copyright (c) International Business Machines  Corp., 2004
 * Copyright (c) Linux Test Project, 2004-2020
 */

/*
 * DESCRIPTION
 *	hugeshmctl02 - check for EACCES, EFAULT and EINVAL errors
 *
 * ALGORITHM
 *	create a large shared memory segment without read or write permissions
 *	create a large shared memory segment with read & write permissions
 *	loop if that option was specified
 *	  call shmctl() using five different invalid cases
 *	  check the errno value
 *	    issue a PASS message if we get EACCES, EFAULT or EINVAL
 *	  otherwise, the tests fails
 *	    issue a FAIL message
 *	call cleanup
 *
 * HISTORY
 *	03/2001 - Written by Wayne Boyer
 *	04/2004 - Updated by Robbie Williamson
 */

#include <pwd.h>
#include <limits.h>
#include "hugetlb.h"
#include "lapi/syscalls.h"

static size_t shm_size;
static int shm_id_1 = -1;
static int shm_id_2 = -1;
static int shm_id_3 = -1;
static struct shmid_ds buf;

static struct tcase {
	int *shmid;
	int cmd;
	struct shmid_ds *sbuf;
	int error;
} tcases[] = {
	/* EFAULT - IPC_SET & buf isn't valid */
	{&shm_id_2, IPC_SET, (struct shmid_ds *)-1, EFAULT},
	/* EFAULT - IPC_STAT & buf isn't valid */
	{&shm_id_2, IPC_STAT, (struct shmid_ds *)-1, EFAULT},
	/* EINVAL - the shmid is not valid */
	{&shm_id_3, IPC_STAT, &buf, EINVAL},
	/* EINVAL - the command is not valid */
	{&shm_id_2, -1, &buf, EINVAL},
};

static int libc_shmctl(int shmid, int cmd, void *buf)
{
	return shmctl(shmid, cmd, buf);
}

static int sys_shmctl(int shmid, int cmd, void *buf)
{
	return tst_syscall(__NR_shmctl, shmid, cmd, buf);
}

static struct test_variants
{
	int (*shmctl)(int shmid, int cmd, void *buf);
	char *desc;
} variants[] = {
	{ .shmctl = libc_shmctl, .desc = "libc shmctl()"},
#if (__NR_shmctl != __LTP__NR_INVALID_SYSCALL)
	{ .shmctl = sys_shmctl,  .desc = "__NR_shmctl syscall"},
#endif
};

static void test_hugeshmctl(unsigned int i)
{
	struct test_variants *tv = &variants[tst_variant];

	if (tcases[i].error == EFAULT && tv->shmctl == libc_shmctl) {
		tst_res(TCONF, "EFAULT is skipped for libc variant");
		return;
	}

	TEST(tv->shmctl(*(tcases[i].shmid), tcases[i].cmd, tcases[i].sbuf));
	if (TST_RET != -1) {
		tst_res(TFAIL, "shmctl succeeded unexpectedly");
		return;
	}

	if (TST_ERR == tcases[i].error) {
		tst_res(TPASS | TTERRNO, "shmctl failed as expected");
		return;
	}

	tst_res(TFAIL | TTERRNO,
			"shmctl failed unexpectedly - expect errno = %d, got",
			tcases[i].error);
}

static void setup(void)
{
	struct test_variants *tv = &variants[tst_variant];
	long hpage_size;

	tst_res(TINFO, "Testing variant: %s", tv->desc);

	if (tst_hugepages == 0)
		tst_brk(TCONF, "No enough hugepages for testing.");

	hpage_size = SAFE_READ_MEMINFO("Hugepagesize:") * 1024;

	shm_size = hpage_size * (tst_hugepages / 2);
	update_shm_size(&shm_size);
	shmkey = getipckey();

	/* create a shared memory segment without read or write permissions */
	shm_id_1 = shmget(shmkey, shm_size, SHM_HUGETLB | IPC_CREAT | IPC_EXCL);
	if (shm_id_1 == -1)
		tst_brk(TBROK | TERRNO, "shmget #1");

	/* create a shared memory segment with read and write permissions */
	shm_id_2 = shmget(shmkey + 1, shm_size,
			  SHM_HUGETLB | IPC_CREAT | IPC_EXCL | SHM_RW);
	if (shm_id_2 == -1)
		tst_brk(TBROK | TERRNO, "shmget #2");
}

static void cleanup(void)
{
	rm_shm(shm_id_1);
	rm_shm(shm_id_2);
}

static struct tst_test test = {
	.test = test_hugeshmctl,
	.test_variants = ARRAY_SIZE(variants),
	.tcnt = ARRAY_SIZE(tcases),
	.needs_root = 1,
	.needs_tmpdir = 1,
	.options = (struct tst_option[]) {
		{"s:", &nr_opt, "Set the number of the been allocated hugepages"},
		{}
	},
	.setup = setup,
	.cleanup = cleanup,
	.hugepages = {128, TST_REQUEST},
};