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/*
* Copyright (C) 2013-2019 Canonical, Ltd.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* This code is a complete clean re-write of the stress tool by
* Colin Ian King <colin.king@canonical.com> and attempts to be
* backwardly compatible with the stress tool by Amos Waterland
* <apw@rossby.metr.ou.edu> but has more stress tests and more
* functionality.
*
*/
#include "stress-ng.h"
#if defined(HAVE_UNSHARE)
#define MAX_PIDS (32)
#if defined(CLONE_FS) || \
defined(CLONE_FILES) || \
defined(CLONE_NEWIPC) || \
defined(CLONE_NEWNET) || \
defined(CLONE_NEWNS) || \
defined(CLONE_NEWPID) || \
defined(CLONE_NEWUSER) || \
defined(CLONE_NEWUTS) || \
defined(CLONE_SYSVSEM) || \
defined(CLONE_THREAD) || \
defined(CLONE_SIGHAND) || \
defined(CLONE_VM)
#define UNSHARE(flags) \
check_unshare(args, flags, #flags);
/*
* unshare with some error checking
*/
static void check_unshare(const args_t *args, int flags, const char *flags_name)
{
int rc;
rc = shim_unshare(flags);
if ((rc < 0) && (errno != EPERM) && (errno != EINVAL)) {
pr_fail("%s: unshare(%s) failed, "
"errno=%d (%s)\n", args->name, flags_name,
errno, strerror(errno));
}
}
#endif
/*
* enough_memory()
* returns true if we have enough memory, ensures
* we don't throttle back the unsharing because we
* get into deep swappiness
*/
static inline bool enough_memory(void)
{
size_t shmall, freemem, totalmem;
bool enough;
stress_get_memlimits(&shmall, &freemem, &totalmem);
enough = (freemem == 0) ? true : freemem > (8 * MB);
return enough;
}
/*
* stress_unshare()
* stress resource unsharing
*/
static int stress_unshare(const args_t *args)
{
pid_t pids[MAX_PIDS];
const uid_t euid = geteuid();
do {
size_t i, n;
(void)memset(pids, 0, sizeof(pids));
for (n = 0; n < MAX_PIDS; n++) {
if (!g_keep_stressing_flag)
break;
if (!enough_memory()) {
/* memory too low, back off */
(void)sleep(1);
break;
}
pids[n] = fork();
if (pids[n] < 0) {
/* Out of resources for fork */
if (errno == EAGAIN)
break;
} else if (pids[n] == 0) {
/* Child */
(void)setpgid(0, g_pgrp);
stress_parent_died_alarm();
/* Make sure this is killable by OOM killer */
set_oom_adjustment(args->name, true);
#if defined(CLONE_FS)
UNSHARE(CLONE_FS);
#endif
#if defined(CLONE_FILES)
UNSHARE(CLONE_FILES);
#endif
#if defined(CLONE_NEWIPC)
UNSHARE(CLONE_NEWIPC);
#endif
#if defined(CLONE_NEWNET)
/*
* CLONE_NEWNET when running as root on
* hundreds of processes can be stupidly
* expensive on older kernels so limit
* this to just one per stressor instance
* and don't unshare of root
*/
if ((n == 0) && (euid != 0))
UNSHARE(CLONE_NEWNET);
#endif
#if defined(CLONE_NEWNS)
UNSHARE(CLONE_NEWNS);
#endif
#if defined(CLONE_NEWPID)
UNSHARE(CLONE_NEWPID);
#endif
#if defined(CLONE_NEWUSER)
UNSHARE(CLONE_NEWUSER);
#endif
#if defined(CLONE_NEWUTS)
UNSHARE(CLONE_NEWUTS);
#endif
#if defined(CLONE_SYSVSEM)
UNSHARE(CLONE_SYSVSEM);
#endif
#if defined(CLONE_THREAD)
UNSHARE(CLONE_THREAD);
#endif
#if defined(CLONE_SIGHAND)
UNSHARE(CLONE_SIGHAND);
#endif
#if defined(CLONE_VM)
UNSHARE(CLONE_VM);
#endif
_exit(0);
} else {
(void)setpgid(pids[n], g_pgrp);
}
}
for (i = 0; i < n; i++) {
int status;
if (pids[i] > 0) {
int ret;
ret = kill(pids[i], SIGKILL);
if (ret == 0) {
if (waitpid(pids[i], &status, 0) < 0) {
if (errno != EINTR)
pr_err("%s: waitpid errno=%d (%s)\n",
args->name, errno, strerror(errno));
}
}
}
}
inc_counter(args);
} while (keep_stressing());
return EXIT_SUCCESS;
}
stressor_info_t stress_unshare_info = {
.stressor = stress_unshare,
.class = CLASS_OS
};
#else
stressor_info_t stress_unshare_info = {
.stressor = stress_not_implemented,
.class = CLASS_OS
};
#endif
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