108 lines
3.0 KiB
C
108 lines
3.0 KiB
C
/*
|
|
|
|
nsjail - cgroup namespacing
|
|
-----------------------------------------
|
|
|
|
Copyright 2014 Google Inc. All Rights Reserved.
|
|
|
|
Licensed under the Apache License, Version 2.0 (the "License");
|
|
you may not use this file except in compliance with the License.
|
|
You may obtain a copy of the License at
|
|
|
|
http://www.apache.org/licenses/LICENSE-2.0
|
|
|
|
Unless required by applicable law or agreed to in writing, software
|
|
distributed under the License is distributed on an "AS IS" BASIS,
|
|
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
See the License for the specific language governing permissions and
|
|
limitations under the License.
|
|
|
|
*/
|
|
|
|
#include "cgroup.h"
|
|
|
|
#include <errno.h>
|
|
#include <fcntl.h>
|
|
#include <stdarg.h>
|
|
#include <stdio.h>
|
|
#include <string.h>
|
|
#include <sys/mount.h>
|
|
#include <sys/stat.h>
|
|
#include <sys/syscall.h>
|
|
#include <sys/time.h>
|
|
#include <sys/types.h>
|
|
#include <unistd.h>
|
|
|
|
#include "log.h"
|
|
#include "util.h"
|
|
|
|
bool cgroupInitNsFromParent(struct nsjconf_t *nsjconf, pid_t pid)
|
|
{
|
|
if (nsjconf->cgroup_mem_max == (size_t) 0) {
|
|
return true;
|
|
}
|
|
|
|
char mem_cgroup_path[PATH_MAX];
|
|
snprintf(mem_cgroup_path, sizeof(mem_cgroup_path), "%s/%s/NSJAIL.%d",
|
|
nsjconf->cgroup_mem_mount, nsjconf->cgroup_mem_parent, (int)pid);
|
|
LOG_D("Create '%s' for PID=%d", mem_cgroup_path, (int)pid);
|
|
if (mkdir(mem_cgroup_path, 0700) == -1 && errno != EEXIST) {
|
|
PLOG_E("mkdir('%s', 0711) failed", mem_cgroup_path);
|
|
return false;
|
|
}
|
|
|
|
char fname[PATH_MAX];
|
|
if (nsjconf->cgroup_mem_max != (size_t) 0) {
|
|
char mem_max_str[512];
|
|
snprintf(mem_max_str, sizeof(mem_max_str), "%zu", nsjconf->cgroup_mem_max);
|
|
snprintf(fname, sizeof(fname), "%s/memory.limit_in_bytes", mem_cgroup_path);
|
|
LOG_D("Setting '%s' to '%s'", fname, mem_max_str);
|
|
if (utilWriteBufToFile(fname, mem_max_str, strlen(mem_max_str), O_WRONLY) == false) {
|
|
LOG_E("Could not update memory cgroup max limit");
|
|
return false;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Use OOM-killer instead of making processes hang/sleep
|
|
*/
|
|
snprintf(fname, sizeof(fname), "%s/memory.oom_control", mem_cgroup_path);
|
|
LOG_D("Writting '0' '%s'", fname);
|
|
if (utilWriteBufToFile(fname, "0", strlen("0"), O_WRONLY) == false) {
|
|
LOG_E("Could not update memory cgroup oom control");
|
|
return false;
|
|
}
|
|
|
|
char pid_str[512];
|
|
snprintf(pid_str, sizeof(pid_str), "%d", (int)pid);
|
|
snprintf(fname, sizeof(fname), "%s/tasks", mem_cgroup_path);
|
|
LOG_D("Adding PID='%s' to '%s'", pid_str, fname);
|
|
if (utilWriteBufToFile(fname, pid_str, strlen(pid_str), O_WRONLY) == false) {
|
|
LOG_E("Could not update memory cgroup task list");
|
|
return false;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
void cgroupFinishFromParent(struct nsjconf_t *nsjconf, pid_t pid)
|
|
{
|
|
if (nsjconf->cgroup_mem_max == (size_t) 0) {
|
|
return;
|
|
}
|
|
|
|
char mem_cgroup_path[PATH_MAX];
|
|
snprintf(mem_cgroup_path, sizeof(mem_cgroup_path), "%s/%s/NSJAIL.%d",
|
|
nsjconf->cgroup_mem_mount, nsjconf->cgroup_mem_parent, (int)pid);
|
|
LOG_D("Remove '%s'", mem_cgroup_path);
|
|
if (rmdir(mem_cgroup_path) == -1) {
|
|
PLOG_W("rmdir('%s') failed", mem_cgroup_path);
|
|
}
|
|
return;
|
|
}
|
|
|
|
bool cgroupInitNs(void)
|
|
{
|
|
return true;
|
|
}
|