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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (c) 2014 Red Hat, Inc.
* Copyright (C) 2022 SUSE LLC Andrea Cervesato <andrea.cervesato@suse.com>
*/
/*\
* [Description]
*
* Test if SysV IPC shared memory is properly working between two different
* namespaces.
*
* [Algorithm]
*
* 1. Clones two child processes with CLONE_NEWIPC flag, each child
* allocates System V shared memory segment (shm) with the _identical_
* key and attaches that segment into its address space.
* 2. Child1 writes into the shared memory segment.
* 3. Child2 writes into the shared memory segment.
* 4. Writes to the shared memory segment with the identical key but from
* two different IPC namespaces should not interfere with each other
* and so child1 checks whether its shared segment wasn't changed
* by child2, if it wasn't test passes, otherwise test fails.
*/
#define _GNU_SOURCE
#include <sys/wait.h>
#include <sys/msg.h>
#include <sys/types.h>
#include "tst_safe_sysv_ipc.h"
#include "tst_test.h"
#include "common.h"
#define TESTKEY 124426L
#define SHMSIZE 50
static int chld1_shm(LTP_ATTRIBUTE_UNUSED void *arg)
{
int id;
char *shmem;
id = SAFE_SHMGET(TESTKEY, SHMSIZE, IPC_CREAT);
shmem = SAFE_SHMAT(id, NULL, 0);
*shmem = 'A';
TST_CHECKPOINT_WAKE_AND_WAIT(0);
if (*shmem != 'A')
tst_res(TFAIL, "shared memory leak between namespaces");
else
tst_res(TPASS, "shared memory didn't leak between namespaces");
TST_CHECKPOINT_WAKE(0);
SAFE_SHMDT(shmem);
SAFE_SHMCTL(id, IPC_RMID, NULL);
return 0;
}
static int chld2_shm(LTP_ATTRIBUTE_UNUSED void *arg)
{
int id;
char *shmem;
id = SAFE_SHMGET(TESTKEY, SHMSIZE, IPC_CREAT);
shmem = SAFE_SHMAT(id, NULL, 0);
TST_CHECKPOINT_WAIT(0);
*shmem = 'B';
TST_CHECKPOINT_WAKE_AND_WAIT(0);
SAFE_SHMDT(shmem);
SAFE_SHMCTL(id, IPC_RMID, NULL);
return 0;
}
static void run(void)
{
clone_unshare_test(T_CLONE, CLONE_NEWIPC, chld1_shm, NULL);
clone_unshare_test(T_CLONE, CLONE_NEWIPC, chld2_shm, NULL);
}
static void setup(void)
{
check_newipc();
}
static struct tst_test test = {
.test_all = run,
.setup = setup,
.needs_root = 1,
.needs_checkpoints = 1,
};
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