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demo_userns.c
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demo_userns.c
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#define _GNU_SOURCE
#include <sys/capability.h>
#include <sys/wait.h>
#include <sched.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#define errExit(msg) do { perror(msg); exit(EXIT_FAILURE); \
} while (0)
static int /* Startup function for cloned child */
childFunc(void *arg)
{
cap_t caps;
printf("\n\n******* info of the child process - start ********\n");
printf("eUID = %ld; eGID = %ld\n", (long) geteuid(), (long) getegid());
printf("pid = %ld; ppid = %ld\n", (long) getpid(), (long) getppid());
caps = cap_get_proc();
printf("capabilities: %s\n", cap_to_text(caps, NULL));
execlp ("sh", "sh", (char *)0);
}
#define STACK_SIZE (1024 * 1024)
static char child_stack[STACK_SIZE]; /* Space for child's stack */
int
main(int argc, char *argv[])
{
cap_t caps;
pid_t pid;
/* Create child; child commences execution in childFunc() */
printf("******* info of the parent process - start ********\n");
caps = cap_get_proc();
printf("capabilities: %s\n", cap_to_text(caps, NULL));
pid = clone(childFunc, child_stack + STACK_SIZE, /* Assume stack grows downward */
CLONE_NEWPID | CLONE_NEWNS | CLONE_NEWNET | CLONE_NEWUTS | CLONE_NEWIPC | CLONE_NEWUSER | SIGCHLD, argv[1]);
if (pid == -1)
errExit("clone");
printf("the parent pid is: %ld; the child pid is: %ld\n", (long)getpid(), (long)pid);
/* Parent falls through to here. Wait for child. */
if (waitpid(pid, NULL, 0) == -1)
errExit("waitpid");
exit(EXIT_SUCCESS);
}