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#define _GNU_SOURCE | |
#include <sched.h> | |
#include <stdio.h> | |
#include <stdlib.h> | |
#include <signal.h> | |
#include <linux/capability.h> | |
#include <sys/mount.h> | |
#include <sys/types.h> | |
#include <sys/wait.h> | |
#include <unistd.h> | |
int child(void *args) | |
{ | |
printf("pid as seen in the child: %lu\n", (unsigned long)getpid()); | |
pid_t p = mount("overlay", "./hatch/mnt", "overlay", 0, "lowerdir=./hatch/lower,upperdir=./hatch/upper,workdir=./hatch/work"); | |
if (p == -1){ | |
perror("mount"); | |
exit(1); | |
} | |
// Expose the mount to the parent namespace | |
p = mount("none", "./hatch/mnt", NULL, MS_SHARED, NULL); | |
if (p == -1){ | |
perror("mount"); | |
exit(1); | |
} | |
char *newargv[] = { "/bin/bash", NULL }; | |
execv("/bin/bash", newargv); | |
perror("exec"); | |
exit(EXIT_FAILURE); | |
return 0; | |
} | |
int main() | |
{ | |
pid_t p = clone(child, malloc(4096) + 4096, CLONE_NEWNS | CLONE_NEWUSER | SIGCHLD, NULL); | |
if (p == -1) { | |
perror("clone"); | |
exit(1); | |
} | |
printf("child pid: %lu\n", (unsigned long)p); | |
waitpid(p, NULL, 0); | |
return 0; | |
} |
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