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#! /bin/bash
# Test for uderef. Since a successful test will kill the shell, we
# need to communicate via the filesystem whether the test worked or
# not.
echo 'Directory for test-uderef.sh'
pwd
# If the feature is not compiled into the kernel, fail right away.
if [ ! -f /sys/kernel/debug/provoke-crash/DIRECT ]; then
echo "Kernel was not compiled with CONFIG_LKDTM"
echo "Not possible to test for UDEREF, failing"
echo "test: uderef: fail"
fi
# Put a marker file that we can check later.
touch /tmp/uderef-6256ff7e
cat /sys/kernel/debug/provoke-crash/DIRECT
(echo EXCEPTION > /sys/kernel/debug/provoke-crash/DIRECT;
rm /tmp/uderef-6256ff7e) &
sleep 1
# If the marker is still present, it suggests that the UDEREF check
# killed the running shell, and we should consider this a pass.
if [ -f /tmp/uderef-6256ff7e ]; then
echo "UDEREF appears to have been detected"
echo "test: uderef: pass"
rm /tmp/uderef-6256ff7e
else
echo "UDEREF didn't appear to work"
echo "test: uderef: fail"
fi
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