simcop2387/linux_namespaces
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Moving this to a VM for saner handling

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This commit is contained in:
Ryan Voots 2017-05-02 13:11:19 -07:00
parent f11ac76330
commit 185f718936
2 changed files with 24 additions and 3 deletions
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4
Makefile
View file

@ -1,7 +1,9 @@
all: program test all: program test
.PHONY: test
test: program test: program
sudo ./program foo sudo ./program tmp
program: main.c program: main.c
gcc main.c -o program gcc main.c -o program

23
main.c
View file

@ -3,8 +3,8 @@
#include <sys/types.h> #include <sys/types.h>
#include <sys/mount.h> #include <sys/mount.h>
#include <dirent.h> #include <dirent.h>
#define _GNU_SOURCE #define _GNU_SOURCE
#include <sched.h> #include <sched.h>
#include <stdint.h> #include <stdint.h>
#include <errno.h> #include <errno.h>
@ -15,12 +15,21 @@ struct args {
uint8_t CSTACK[8192]; uint8_t CSTACK[8192];
int setup_jail() {
mount("tmpfs", "jail/tmp", "tmpfs", MS_PRIVATE, NULL); // TODO this needs to also have a tmpfs data to limit size
mount("foo", "jail/foo", NULL, MS_PRIVATE|MS_BIND|MS_RDONLY, NULL);
chdir("jail");
chroot(".");
}
int myreaddir(void *fooargs) { int myreaddir(void *fooargs) {
int len; int len;
struct dirent *pDirent; struct dirent *pDirent;
DIR *pDir; DIR *pDir;
struct args *myargs = (struct args *) fooargs; struct args *myargs = (struct args *) fooargs;
setup_jail();
if (myargs->c < 2) { if (myargs->c < 2) {
printf ("Usage: testprog <dirname>\n"); printf ("Usage: testprog <dirname>\n");
return 1; return 1;
@ -30,12 +39,22 @@ int myreaddir(void *fooargs) {
mount(NULL, ".", NULL, MS_PRIVATE, NULL); mount(NULL, ".", NULL, MS_PRIVATE, NULL);
umount(myargs->v[1]); umount(myargs->v[1]);
// sleep(100);
pDir = opendir (myargs->v[1]); pDir = opendir (myargs->v[1]);
if (pDir == NULL) { if (pDir == NULL) {
printf ("Cannot open directory '%s'\n", myargs->v[1]); printf ("Cannot open directory '%s'\n", myargs->v[1]);
return 1; return 1;
} }
char file[32];
snprintf(file, 32, "/tmp/%08d", rand());
FILE *foo=fopen(file, "w");
fclose(file);
sleep(100);
while ((pDirent = readdir(pDir)) != NULL) { while ((pDirent = readdir(pDir)) != NULL) {
printf ("[%s]\n", pDirent->d_name); printf ("[%s]\n", pDirent->d_name);
} }