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Instructions of how to make testing easy [message #13299 is a reply to message #13284] Thu, 24 May 2007 13:19 Go to previous messageGo to previous message
Pavel Emelianov is currently offline  Pavel Emelianov
Messages: 1149
Registered: September 2006
Senior Member
That's the program I used for testing. It creates a new
session, chroots to new root, clones the namespace, mounts
proc and launches the sshd to keep track of the terminals.

The new root I prepared was bind-mounted /lib, /bin, /usr
etc directories, copied /dev devices with devpts mounted
inside and empty /var (for sshd) and /proc (for new mount).

After these preparations I launched this enter program and
then used ssh to get into the namespace.

Hope this will help.

The patches introduced was then tested with some mportaint
tests from ltp testsuite in 4 ways:

1 kernel w/o the patch
2 kernel with CONFIG_PID_NS=n
3 kernel with namespaces in init namespace
4 kernel with namespaces in subnamespace

The results coincided.

#include <unistd.h>
#include <sys/wait.h>
#include <errno.h>
#include <linux/unistd.h>

#ifndef __NR_unshare
#define __NR_unshare 310
#endif

_syscall1(int, unshare, int, flags)

#define CLONE_NEWPIDS 0x10000000
#define ROOT_DIR "./new_root"

int main(void)
{
int pid;
int status;

pid = fork();
if (pid < 0) {
perror("Can't fork\n");
return 1;
}

if (pid > 0) {
if (waitpid(pid, &status, 0) < 0) {
perror("Can't wait kid\n");
return 2;
}

if (WIFEXITED(status))
printf("%d exited with %d/%d\n", pid,
WEXITSTATUS(status) & 0xf,
WEXITSTATUS(status) >> 3);
else if (WIFSIGNALED(status))
printf("%d signalled with %d\n", pid, WTERMSIG(status));
else
printf("Some shit happened with %d\n", pid);
return 0;
}

printf("Set new sid\n");
if (setsid() < 0)
return (errno << 4) + 0;

printf("Unshare\n");
if (unshare(CLONE_NEWPIDS) < 0)
return (errno << 4) + 2;

printf("Chroot\n");
if (chroot(ROOT_DIR) < 0)
return (errno << 4) + 1;

printf("Mount proc\n");
if (mount("none", "/proc", "proc", 0, NULL) < 0)
return (errno << 4) + 3;

printf("Launching sshd\n");
if (fork() == 0) {
execl("/usr/sbin/sshd", "/usr/sbin/sshd", "-p", "2202", NULL);
return (errno << 4) + 3;
}

/* Never exit... Bad init */
while (1) {
if (wait(NULL) < 0)
sleep(1);
}
return 0;
}

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