regress/sys/net/bpf/out-of-bounds/out-of-bounds.sh

   1 #!/bin/sh
   2
   3 # an out-of-bounds read in the BPF expression should exit the bpf program,
   4 # regardless of other expressions. Pass an expression to tcpdump which
   5 # performs an out-of-bound read and ping with a packet which would cause
   6 # the expression to succeed if the out-of-bounds read is not handled.
   7
   8 # exit status: 0 - pass, 1 - fail, 2 - skip
   9
  10 IFACE=${IFACE:-lo0}
  11 ADDR=${ADDR:-127.0.0.1}
  12
  13 tcpdump -c1 -np -i $IFACE \( link[34000:2]=0 or icmp \) and ip[36:2]=0xcafe > /dev/null &
  14 TCPDUMP_PID=$!
  15
  16 sleep 1
  17 if ! kill -0 $TCPDUMP_PID > /dev/null 2>&1 ; then
  18         echo "SKIPPED tcpdump exited - are you root?"; exit 2;
  19 fi
  20 if ! ping -c1 -p cafe $ADDR > /dev/null 2>&1 ; then
  21         echo "SKIPPED not able to ping localhost";
  22         kill $TCPDUMP_PID > /dev/null 2>&1 ; exit 2;
  23 fi
  24 sleep 2
  25 if ! kill $TCPDUMP_PID > /dev/null 2>&1; then
  26         echo "FAILED"; exit 1;
  27 fi
  28 wait $TCPDUMP_PID; echo "PASSED"; exit 0;