diff --git
a/src/jdk.attach/linux/classes/sun/tools/attach/VirtualMachineImpl.java
b/src/jdk.attach/linux/classes/sun/tools/attach/V
irtualMachineImpl.java
index 81d4fd259ed..74bd60c791d 100644
--- a/src/jdk.attach/linux/classes/sun/tools/attach/VirtualMachineImpl.java
+++ b/src/jdk.attach/linux/classes/sun/tools/attach/VirtualMachineImpl.java
@@ -34,6 +34,7 @@
import java.nio.file.Path;
import java.nio.file.Paths;
import java.nio.file.Files;
+import java.util.Optional;
import static java.nio.charset.StandardCharsets.UTF_8;
@@ -47,7 +48,21 @@ public class VirtualMachineImpl extends
HotSpotVirtualMachine {
// will not be able to find all Hotspot processes.
// Any changes to this needs to be synchronized with HotSpot.
private static final String tmpdir = "/tmp";
+
+ private static final Optional<Path> MOUNT_NS;
+
+ static {
+ Path mountns = null;
+ try {
+ mountns = Files.readSymbolicLink(Path.of("/proc/self/ns/mnt"));
+ } catch (IOException ioe) {
+ } finally {
+ MOUNT_NS = Optional.ofNullable(mountns);
+ }
+ }
+
String socket_path;
+
/**
* Attaches to the target VM
*/
@@ -236,7 +251,18 @@ private File createAttachFile(int pid, int ns_pid)
throws IOException {
private String findTargetProcessTmpDirectory(int pid, int ns_pid)
throws IOException {
String root;
- if (pid != ns_pid) {
+
+ Optional<Path> tgtMountNS = Optional.empty();
+
+ try {
+ tgtMountNS =
Optional.ofNullable(Files.readSymbolicLink(Path.of("/proc",
Integer.toString(pid), "ns", "mnt")));
+ } catch (IOException _) {
+ // do nothing...
+ }
+
+ final boolean sameMountNS = MOUNT_NS.isPresent() &&
tgtMountNS.isPresent() && MOUNT_NS.equals(tgtMountNS);
+
+ if (!sameMountNS || pid != ns_pid) {
// A process may not exist in the same mount namespace as
the caller, e.g.
// if we are trying to attach to a JVM process inside a
container.
// Instead, attach relative to the target root filesystem
as exposed by
@@ -248,11 +274,11 @@ private String findTargetProcessTmpDirectory(int
pid, int ns_pid) throws IOExcep
"of target process %d", procRootDirectory,
pid));
}
- root = procRootDirectory + "/" + tmpdir;
- } else {
- root = tmpdir;
- }
- return root;
+ return procRootDirectory + "/" + tmpdir;
+ } else if (sameMountNS) {
+ return tmpdir;
+ } else
+ throw new IOException(String.format("target process:%d and this
do not share common mount namespace for: %s attach faile
d", pid, tmpdir));
}
/*
