I have an Linux embedded device that I want to debug the cfg80211.ko
I have full root SSH on that device.
How can I debug cfg80211.ko?
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Seeing as this is an embedded device you can't debug through a VM, so this needs local debugging. A couple of questions... do you have symbols for the running kernel, and can you install packages on this device?– Mega TonnageJul 6 at 0:53
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What do you mean install a packages into device? I can run gdbserver etc. That Linux Arm embedded @MegaTonnage– KokomelomJul 6 at 5:40
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Added as an answer, however I haven't tested this recently and some of it likely won't be relevant to your embedded device.– Mega TonnageJul 6 at 6:05
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1 Answer
Adding my notes for Fedora here, maybe they'll help:
# ensure kernel core is configured
grep KCORE /boot/config-$(uname -r)
# install kernel debuginfo for symbols
dnf debuginfo-install kernel-core-$(uname -r)
# debug kernel using core file
gdb /boot/vmlinuz-$(uname -r) /proc/kcore
# find address
sudo cat /sys/module/<module>/sections/.text
<address>
# extract module if required
cp /usr/lib/modules/$(uname -r)/kernel/drivers/<module>/host/<module>.ko.xz ./
xz -d <module>.ko.xz
# load mod symbols
add-symbol-file /root/<module>.ko <address>
