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

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fixes #347
This commit is contained in:
Bob Lantz
2014-08-26 14:09:40 -07:00
parent 16a384ab4b
commit bfdbb7089a
1 changed files with 11 additions and 10 deletions
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mnexec.c
+11 -10
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@@ -140,9 +140,9 @@ int main(int argc, char *argv[])
fflush(stdout);
break;
case 'a':
/* Attach to pid's network namespace and mount namespace*/
/* Attach to pid's network namespace and mount namespace */
pid = atoi(optarg);
sprintf(path, "/proc/%d/ns/net", pid );
sprintf(path, "/proc/%d/ns/net", pid);
nsid = open(path, O_RDONLY);
if (nsid < 0) {
perror(path);
@@ -152,15 +152,16 @@ int main(int argc, char *argv[])
perror("setns");
return 1;
}
sprintf(path, "/proc/%d/ns/mnt", pid );
/* Plan A: call setns() to attach to mount namespace */
sprintf(path, "/proc/%d/ns/mnt", pid);
nsid = open(path, O_RDONLY);
if (nsid < 0) {
perror(path);
return 1;
}
if (setns(nsid, 0) != 0) {
perror("setns");
return 1;
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;
}
}
break;
case 'g':