563 lines
15 KiB
C++
563 lines
15 KiB
C++
/*
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nsjail - subprocess management
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-----------------------------------------
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Copyright 2014 Google Inc. All Rights Reserved.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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#include "subproc.h"
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#include <errno.h>
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#include <fcntl.h>
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#include <limits.h>
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#include <linux/sched.h>
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#include <sched.h>
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#include <setjmp.h>
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#include <signal.h>
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#include <stdbool.h>
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#include <stddef.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/socket.h>
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#include <sys/syscall.h>
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#include <sys/types.h>
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#include <sys/wait.h>
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#include <time.h>
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#include <unistd.h>
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#include <string>
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#include <vector>
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#include "cgroup.h"
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#include "contain.h"
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#include "logs.h"
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#include "macros.h"
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#include "net.h"
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#include "sandbox.h"
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#include "user.h"
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#include "util.h"
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namespace subproc {
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#if !defined(CLONE_NEWCGROUP)
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#define CLONE_NEWCGROUP 0x02000000
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#endif /* !defined(CLONE_NEWCGROUP) */
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static const std::string cloneFlagsToStr(uintptr_t flags) {
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std::string res;
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struct {
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const uintptr_t flag;
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const char* const name;
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} static const cloneFlags[] = {
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NS_VALSTR_STRUCT(CLONE_VM),
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NS_VALSTR_STRUCT(CLONE_FS),
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NS_VALSTR_STRUCT(CLONE_FILES),
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NS_VALSTR_STRUCT(CLONE_SIGHAND),
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NS_VALSTR_STRUCT(CLONE_PTRACE),
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NS_VALSTR_STRUCT(CLONE_VFORK),
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NS_VALSTR_STRUCT(CLONE_PARENT),
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NS_VALSTR_STRUCT(CLONE_THREAD),
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NS_VALSTR_STRUCT(CLONE_NEWNS),
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NS_VALSTR_STRUCT(CLONE_SYSVSEM),
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NS_VALSTR_STRUCT(CLONE_SETTLS),
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NS_VALSTR_STRUCT(CLONE_PARENT_SETTID),
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NS_VALSTR_STRUCT(CLONE_CHILD_CLEARTID),
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NS_VALSTR_STRUCT(CLONE_DETACHED),
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NS_VALSTR_STRUCT(CLONE_UNTRACED),
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NS_VALSTR_STRUCT(CLONE_CHILD_SETTID),
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NS_VALSTR_STRUCT(CLONE_NEWCGROUP),
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NS_VALSTR_STRUCT(CLONE_NEWUTS),
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NS_VALSTR_STRUCT(CLONE_NEWIPC),
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NS_VALSTR_STRUCT(CLONE_NEWUSER),
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NS_VALSTR_STRUCT(CLONE_NEWPID),
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NS_VALSTR_STRUCT(CLONE_NEWNET),
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NS_VALSTR_STRUCT(CLONE_IO),
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};
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uintptr_t knownFlagMask = CSIGNAL;
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for (const auto& i : cloneFlags) {
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if (flags & i.flag) {
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res.append(i.name).append("|");
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}
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knownFlagMask |= i.flag;
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}
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if (flags & ~(knownFlagMask)) {
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util::StrAppend(&res, "%#tx|", flags & ~(knownFlagMask));
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}
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res.append(util::sigName(flags & CSIGNAL).c_str());
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return res;
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}
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/* Reset the execution environment for the new process */
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static bool resetEnv(void) {
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/* Set all previously changed signals to their default behavior */
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for (const auto& sig : nssigs) {
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if (signal(sig, SIG_DFL) == SIG_ERR) {
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PLOG_W("signal(%s, SIG_DFL)", util::sigName(sig).c_str());
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return false;
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}
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}
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/* Unblock all signals */
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sigset_t sset;
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sigemptyset(&sset);
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if (sigprocmask(SIG_SETMASK, &sset, NULL) == -1) {
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PLOG_W("sigprocmask(SIG_SET, empty)");
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return false;
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}
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return true;
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}
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static const char kSubprocDoneChar = 'D';
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static int subprocNewProc(nsjconf_t* nsjconf, int fd_in, int fd_out, int fd_err, int pipefd) {
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if (!contain::setupFD(nsjconf, fd_in, fd_out, fd_err)) {
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_exit(0xff);
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}
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if (!resetEnv()) {
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_exit(0xff);
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}
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if (pipefd == -1) {
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if (!user::initNsFromParent(nsjconf, getpid())) {
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LOG_E("Couldn't initialize net user namespace");
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_exit(0xff);
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}
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if (!cgroup::initNsFromParent(nsjconf, getpid())) {
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LOG_E("Couldn't initialize net user namespace");
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_exit(0xff);
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}
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} else {
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char doneChar;
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if (util::readFromFd(pipefd, &doneChar, sizeof(doneChar)) != sizeof(doneChar)) {
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_exit(0xff);
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}
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if (doneChar != kSubprocDoneChar) {
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_exit(0xff);
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}
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}
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if (!contain::containProc(nsjconf)) {
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_exit(0xff);
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}
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if (!nsjconf->keep_env) {
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clearenv();
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}
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for (const auto& env : nsjconf->envs) {
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putenv(const_cast<char*>(env.c_str()));
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}
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auto connstr = net::connToText(fd_in, /* remote= */ true, NULL);
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LOG_I("Executing '%s' for '%s'", nsjconf->exec_file.c_str(), connstr.c_str());
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std::vector<const char*> argv;
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for (const auto& s : nsjconf->argv) {
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argv.push_back(s.c_str());
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LOG_D(" Arg: '%s'", s.c_str());
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}
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argv.push_back(nullptr);
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/* Should be the last one in the sequence */
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if (!sandbox::applyPolicy(nsjconf)) {
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exit(0xff);
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}
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if (nsjconf->use_execveat) {
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#if defined(__NR_execveat)
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syscall(__NR_execveat, (uintptr_t)nsjconf->exec_fd, "", (char* const*)argv.data(),
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environ, (uintptr_t)AT_EMPTY_PATH);
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#else /* defined(__NR_execveat) */
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LOG_F("Your system doesn't support execveat() syscall");
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#endif /* defined(__NR_execveat) */
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} else {
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execv(nsjconf->exec_file.c_str(), (char* const*)argv.data());
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}
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PLOG_E("execve('%s') failed", nsjconf->exec_file.c_str());
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_exit(0xff);
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}
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static void addProc(nsjconf_t* nsjconf, pid_t pid, int sock) {
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pids_t p;
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p.pid = pid;
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p.start = time(NULL);
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p.remote_txt = net::connToText(sock, /* remote= */ true, &p.remote_addr);
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char fname[PATH_MAX];
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snprintf(fname, sizeof(fname), "/proc/%d/syscall", (int)pid);
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p.pid_syscall_fd = TEMP_FAILURE_RETRY(open(fname, O_RDONLY | O_CLOEXEC));
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nsjconf->pids.push_back(p);
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LOG_D("Added pid '%d' with start time '%u' to the queue for IP: '%s'", p.pid,
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(unsigned int)p.start, p.remote_txt.c_str());
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}
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static void removeProc(nsjconf_t* nsjconf, pid_t pid) {
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for (auto p = nsjconf->pids.begin(); p != nsjconf->pids.end(); ++p) {
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if (p->pid == pid) {
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LOG_D("Removing pid '%d' from the queue (IP:'%s', start time:'%s')", p->pid,
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p->remote_txt.c_str(), util::timeToStr(p->start).c_str());
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close(p->pid_syscall_fd);
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nsjconf->pids.erase(p);
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return;
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}
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}
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LOG_W("PID: %d not found (?)", pid);
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}
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int countProc(nsjconf_t* nsjconf) {
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return nsjconf->pids.size();
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}
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void displayProc(nsjconf_t* nsjconf) {
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LOG_I("Total number of spawned namespaces: %d", countProc(nsjconf));
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time_t now = time(NULL);
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for (const auto& pid : nsjconf->pids) {
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time_t diff = now - pid.start;
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time_t left = nsjconf->tlimit ? nsjconf->tlimit - diff : 0;
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LOG_I("PID: %d, Remote host: %s, Run time: %ld sec. (time left: %ld sec.)", pid.pid,
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pid.remote_txt.c_str(), (long)diff, (long)left);
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}
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}
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static const pids_t* getPidElem(nsjconf_t* nsjconf, pid_t pid) {
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for (const auto& p : nsjconf->pids) {
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if (p.pid == pid) {
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return &p;
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}
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}
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return NULL;
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}
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static void seccompViolation(nsjconf_t* nsjconf, siginfo_t* si) {
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LOG_W("PID: %d commited a syscall/seccomp violation and exited with SIGSYS", si->si_pid);
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const pids_t* p = getPidElem(nsjconf, si->si_pid);
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if (p == NULL) {
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LOG_W("PID:%d SiSyscall: %d, SiCode: %d, SiErrno: %d", (int)si->si_pid,
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si->si_syscall, si->si_code, si->si_errno);
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LOG_E("Couldn't find pid element in the subproc list for PID: %d", (int)si->si_pid);
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return;
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}
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char buf[4096];
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ssize_t rdsize = util::readFromFd(p->pid_syscall_fd, buf, sizeof(buf) - 1);
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if (rdsize < 1) {
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LOG_W("PID: %d, SiSyscall: %d, SiCode: %d, SiErrno: %d", (int)si->si_pid,
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si->si_syscall, si->si_code, si->si_errno);
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return;
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}
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buf[rdsize - 1] = '\0';
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uintptr_t arg1, arg2, arg3, arg4, arg5, arg6, sp, pc;
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ptrdiff_t sc;
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int ret = sscanf(buf, "%td %tx %tx %tx %tx %tx %tx %tx %tx", &sc, &arg1, &arg2, &arg3,
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&arg4, &arg5, &arg6, &sp, &pc);
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if (ret == 9) {
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LOG_W(
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"PID: %d, Syscall number: %td, Arguments: %#tx, %#tx, %#tx, %#tx, %#tx, %#tx, "
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"SP: %#tx, PC: %#tx, si_syscall: %d, si_errno: %#x",
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(int)si->si_pid, sc, arg1, arg2, arg3, arg4, arg5, arg6, sp, pc, si->si_syscall,
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si->si_errno);
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} else if (ret == 3) {
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LOG_W("PID: %d, SiSyscall: %d, SiCode: %d, SiErrno: %d, SP: %#tx, PC: %#tx",
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(int)si->si_pid, si->si_syscall, si->si_code, si->si_errno, arg1, arg2);
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} else {
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LOG_W("PID: %d, SiSyscall: %d, SiCode: %d, SiErrno: %d, Syscall string '%s'",
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(int)si->si_pid, si->si_syscall, si->si_code, si->si_errno, buf);
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}
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}
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int reapProc(nsjconf_t* nsjconf) {
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int status;
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int rv = 0;
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siginfo_t si;
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for (;;) {
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si.si_pid = 0;
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if (waitid(P_ALL, 0, &si, WNOHANG | WNOWAIT | WEXITED) == -1) {
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break;
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}
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if (si.si_pid == 0) {
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break;
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}
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if (si.si_code == CLD_KILLED && si.si_status == SIGSYS) {
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seccompViolation(nsjconf, &si);
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}
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if (wait4(si.si_pid, &status, WNOHANG, NULL) == si.si_pid) {
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cgroup::finishFromParent(nsjconf, si.si_pid);
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std::string remote_txt = "[UNKNOWN]";
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const pids_t* elem = getPidElem(nsjconf, si.si_pid);
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if (elem) {
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remote_txt = elem->remote_txt;
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}
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if (WIFEXITED(status)) {
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LOG_I("PID: %d (%s) exited with status: %d, (PIDs left: %d)",
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si.si_pid, remote_txt.c_str(), WEXITSTATUS(status),
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countProc(nsjconf) - 1);
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removeProc(nsjconf, si.si_pid);
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rv = WEXITSTATUS(status) % 100;
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if (rv == 0 && WEXITSTATUS(status) != 0) {
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rv = 1;
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}
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}
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if (WIFSIGNALED(status)) {
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LOG_I(
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"PID: %d (%s) terminated with signal: %s (%d), (PIDs left: %d)",
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si.si_pid, remote_txt.c_str(),
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util::sigName(WTERMSIG(status)).c_str(), WTERMSIG(status),
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countProc(nsjconf) - 1);
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removeProc(nsjconf, si.si_pid);
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rv = 100 + WTERMSIG(status);
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}
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}
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}
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time_t now = time(NULL);
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for (const auto& p : nsjconf->pids) {
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if (nsjconf->tlimit == 0) {
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continue;
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}
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pid_t pid = p.pid;
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time_t diff = now - p.start;
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if (diff >= nsjconf->tlimit) {
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LOG_I("PID: %d run time >= time limit (%ld >= %ld) (%s). Killing it", pid,
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(long)diff, (long)nsjconf->tlimit, p.remote_txt.c_str());
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/*
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* Probably a kernel bug - some processes cannot be killed with KILL if
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* they're namespaced, and in a stopped state
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*/
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kill(pid, SIGCONT);
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PLOG_D("Sent SIGCONT to PID: %d", pid);
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kill(pid, SIGKILL);
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PLOG_D("Sent SIGKILL to PID: %d", pid);
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}
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}
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return rv;
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}
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void killAll(nsjconf_t* nsjconf) {
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for (const auto& p : nsjconf->pids) {
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kill(p.pid, SIGKILL);
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}
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}
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static bool initParent(nsjconf_t* nsjconf, pid_t pid, int pipefd) {
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if (!net::initNsFromParent(nsjconf, pid)) {
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LOG_E("Couldn't create and put MACVTAP interface into NS of PID '%d'", pid);
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return false;
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}
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if (!cgroup::initNsFromParent(nsjconf, pid)) {
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LOG_E("Couldn't initialize cgroup user namespace");
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exit(0xff);
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}
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if (!user::initNsFromParent(nsjconf, pid)) {
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LOG_E("Couldn't initialize user namespaces for pid %d", pid);
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return false;
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}
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if (util::writeToFd(pipefd, &kSubprocDoneChar, sizeof(kSubprocDoneChar)) !=
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sizeof(kSubprocDoneChar)) {
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LOG_E("Couldn't signal the new process via a socketpair");
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return false;
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}
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return true;
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}
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void runChild(nsjconf_t* nsjconf, int fd_in, int fd_out, int fd_err) {
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if (!net::limitConns(nsjconf, fd_in)) {
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return;
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}
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unsigned long flags = 0UL;
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flags |= (nsjconf->clone_newnet ? CLONE_NEWNET : 0);
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flags |= (nsjconf->clone_newuser ? CLONE_NEWUSER : 0);
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flags |= (nsjconf->clone_newns ? CLONE_NEWNS : 0);
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flags |= (nsjconf->clone_newpid ? CLONE_NEWPID : 0);
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flags |= (nsjconf->clone_newipc ? CLONE_NEWIPC : 0);
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flags |= (nsjconf->clone_newuts ? CLONE_NEWUTS : 0);
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flags |= (nsjconf->clone_newcgroup ? CLONE_NEWCGROUP : 0);
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if (nsjconf->mode == MODE_STANDALONE_EXECVE) {
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LOG_D("Entering namespace with flags:%s", cloneFlagsToStr(flags).c_str());
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if (unshare(flags) == -1) {
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PLOG_E("unshare(%s)", cloneFlagsToStr(flags).c_str());
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_exit(0xff);
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}
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subprocNewProc(nsjconf, fd_in, fd_out, fd_err, -1);
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}
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flags |= SIGCHLD;
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LOG_D("Creating new process with clone flags:%s", cloneFlagsToStr(flags).c_str());
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int sv[2];
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if (socketpair(AF_UNIX, SOCK_STREAM | SOCK_CLOEXEC, 0, sv) == -1) {
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PLOG_E("socketpair(AF_UNIX, SOCK_STREAM | SOCK_CLOEXEC) failed");
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return;
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}
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int child_fd = sv[0];
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int parent_fd = sv[1];
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pid_t pid = cloneProc(flags);
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if (pid == 0) {
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close(parent_fd);
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subprocNewProc(nsjconf, fd_in, fd_out, fd_err, child_fd);
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}
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close(child_fd);
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if (pid == -1) {
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if (flags & CLONE_NEWCGROUP) {
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PLOG_E(
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"nsjail tried to use the CLONE_NEWCGROUP clone flag, which is "
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"supported under kernel versions >= 4.6 only. Try disabling this flag");
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}
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PLOG_E(
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"clone(flags=%s) failed. You probably need root privileges if your system "
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"doesn't support CLONE_NEWUSER. Alternatively, you might want to recompile "
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"your kernel with support for namespaces or check the setting of the "
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"kernel.unprivileged_userns_clone sysctl",
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cloneFlagsToStr(flags).c_str());
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close(parent_fd);
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return;
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}
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addProc(nsjconf, pid, fd_in);
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if (!initParent(nsjconf, pid, parent_fd)) {
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close(parent_fd);
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return;
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}
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close(parent_fd);
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}
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/*
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* Will be used inside the child process only, so it's safe to have it in BSS.
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* Some CPU archs (e.g. aarch64) must have it aligned. Size: 128 KiB (/2)
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*/
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static uint8_t cloneStack[128 * 1024] __attribute__((aligned(__BIGGEST_ALIGNMENT__)));
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/* Cannot be on the stack, as the child's stack pointer will change after clone() */
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static __thread jmp_buf env;
|
|
|
|
static int cloneFunc(void* arg __attribute__((unused))) {
|
|
longjmp(env, 1);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Avoid problems with caching of PID/TID in glibc - when using syscall(__NR_clone) glibc doesn't
|
|
* update the internal PID/TID caches, what can lead to invalid values being returned by getpid()
|
|
* or incorrect PID/TIDs used in raise()/abort() functions
|
|
*/
|
|
pid_t cloneProc(uintptr_t flags) {
|
|
if (flags & CLONE_VM) {
|
|
LOG_E("Cannot use clone(flags & CLONE_VM)");
|
|
return -1;
|
|
}
|
|
|
|
if (setjmp(env) == 0) {
|
|
LOG_D("Cloning process with flags:%s", cloneFlagsToStr(flags).c_str());
|
|
/*
|
|
* Avoid the problem of the stack growing up/down under different CPU architectures,
|
|
* by using middle of the static stack buffer (which is temporary, and used only
|
|
* inside of the cloneFunc()
|
|
*/
|
|
void* stack = &cloneStack[sizeof(cloneStack) / 2];
|
|
/* Parent */
|
|
return clone(cloneFunc, stack, flags, NULL, NULL, NULL);
|
|
}
|
|
/* Child */
|
|
return 0;
|
|
}
|
|
|
|
int systemExe(const std::vector<std::string>& args, char** env) {
|
|
bool exec_failed = false;
|
|
|
|
std::vector<const char*> argv;
|
|
for (const auto& a : args) {
|
|
argv.push_back(a.c_str());
|
|
}
|
|
argv.push_back(nullptr);
|
|
|
|
int sv[2];
|
|
if (pipe2(sv, O_CLOEXEC) == -1) {
|
|
PLOG_W("pipe2(sv, O_CLOEXEC");
|
|
return -1;
|
|
}
|
|
|
|
pid_t pid = fork();
|
|
if (pid == -1) {
|
|
PLOG_W("fork()");
|
|
close(sv[0]);
|
|
close(sv[1]);
|
|
return -1;
|
|
}
|
|
|
|
if (pid == 0) {
|
|
close(sv[0]);
|
|
execve(argv[0], (char* const*)argv.data(), (char* const*)env);
|
|
PLOG_W("execve('%s')", argv[0]);
|
|
util::writeToFd(sv[1], "A", 1);
|
|
exit(0);
|
|
}
|
|
|
|
close(sv[1]);
|
|
char buf[1];
|
|
if (util::readFromFd(sv[0], buf, sizeof(buf)) > 0) {
|
|
exec_failed = true;
|
|
LOG_W("Couldn't execute '%s'", argv[0]);
|
|
}
|
|
close(sv[0]);
|
|
|
|
for (;;) {
|
|
int status;
|
|
int ret = wait4(pid, &status, __WALL, NULL);
|
|
if (ret == -1 && errno == EINTR) {
|
|
continue;
|
|
}
|
|
if (ret == -1) {
|
|
PLOG_W("wait4(pid=%d)", pid);
|
|
return -1;
|
|
}
|
|
if (WIFEXITED(status)) {
|
|
int exit_code = WEXITSTATUS(status);
|
|
LOG_D("PID %d exited with exit code: %d", pid, exit_code);
|
|
if (exec_failed) {
|
|
return -1;
|
|
} else if (exit_code == 0) {
|
|
return 0;
|
|
} else {
|
|
return 1;
|
|
}
|
|
}
|
|
if (WIFSIGNALED(status)) {
|
|
int exit_signal = WTERMSIG(status);
|
|
LOG_W("PID %d killed by signal: %d (%s)", pid, exit_signal,
|
|
util::sigName(exit_signal).c_str());
|
|
return 2;
|
|
}
|
|
LOG_W("Unknown exit status: %d", status);
|
|
}
|
|
}
|
|
|
|
} // namespace subproc
|