Fall back to chroot() if setns() fails for mnt namespace

fixes #347
2014-08-26 14:09:40 -07:00
parent 16a384ab4b
commit bfdbb7089a
1 changed files with 11 additions and 10 deletions
@@ -152,15 +152,16 @@ int main(int argc, char *argv[])
                perror("setns");
                return 1;
            }
+            /* Plan A: call setns() to attach to mount namespace */
            sprintf(path, "/proc/%d/ns/mnt", pid);
            nsid = open(path, O_RDONLY);
-            if (nsid < 0) {
+            if (nsid < 0 || setns(nsid, 0) != 0) {
+                /* Plan B: chroot into pid's root file system */
+                sprintf(path, "/proc/%d/root", pid);
+                if (chroot(path) < 0) {
                    perror(path);
                    return 1;
                }
-            if (setns(nsid, 0) != 0) {
-                perror("setns");
-                return 1;
            }
            break;
        case 'g':