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Diffstat (limited to 'results/classifier/deepseek-2-tmp/output/network/1668273')
| -rw-r--r-- | results/classifier/deepseek-2-tmp/output/network/1668273 | 65 |
1 files changed, 0 insertions, 65 deletions
diff --git a/results/classifier/deepseek-2-tmp/output/network/1668273 b/results/classifier/deepseek-2-tmp/output/network/1668273 deleted file mode 100644 index 8fda6a39..00000000 --- a/results/classifier/deepseek-2-tmp/output/network/1668273 +++ /dev/null @@ -1,65 +0,0 @@ - -DoS possible on - a QEMU process using userspace SLIRP? - -Steps to reproduce: - -- Launch a VM using QEMU: - -$ qemu-system-x86_64 -machine accel=kvm \ - -hda Fedora-Cloud-Base-25-1.3.x86_64.qcow2 \ - -m 2G \ - -smp 2 \ - -vnc :8 \ - -boot dc \ - -vga std \ - -cpu host \ - -net nic,vlan=0 \ - -net user,vlan=0,hostfwd=tcp::10024-:22,hostfwd=tcp::8082-:80 - -- SSH into the VM, install httpd, start httpd - -$ ssh -p 10024 root@localhost 'dnf install -y httpd && systemctl start httpd' - -- Compile and run the following Java program: - -$ cat <<EOF > URLConnectionReader.java -import java.net.*; -import java.io.*; - -public class URLConnectionReader { - public static void main(String[] args) throws Exception { - int i = 0; - while (i < 1024) { - URL this_is_404 = new URL("http://localhost:8082/blah"); - URLConnection yc = this_is_404.openConnection(); - try { - BufferedReader in = new BufferedReader(new InputStreamReader( - yc.getInputStream())); - String inputLine; - while ((inputLine = in.readLine()) != null) - System.out.println(inputLine); - in.close(); - } catch (Exception e) { - //HttpURLConnection urlConnection = (HttpURLConnection) yc; - //urlConnection.disconnect(); - } - i++; - } - Thread.sleep(1000000000); - } -} - -$ javac URLConnectionReader.java - -$ java URLConnectionReader & - -The java program tries to open a lot of HTTP connections, but never calls disconnect() on any. - -- Take a look at the list of open FDs of the qemu process: - -$ ls -tl /proc/${qemu-pid}/fd - -$ lsof -p ${qemu-pid} -All of the TCP connections will be stuck at FIN_WAIT2 - -The VM becomes unresponsive. Neither SSH or VNC works on this. \ No newline at end of file |