mirror of
https://github.com/linuxboot/heads.git
synced 2025-02-15 23:12:13 +00:00
65 lines
1.8 KiB
Bash
Executable File
65 lines
1.8 KiB
Bash
Executable File
#!/bin/bash
|
|
# extend a TPM PCR with a module and then load it
|
|
# any arguments will also be measured.
|
|
# The default PCR to be extended is 5, but can be
|
|
# overridden with the MODULE_PCR environment variable
|
|
|
|
. /etc/functions
|
|
|
|
TRACE_FUNC
|
|
|
|
MODULE="$1"; shift
|
|
|
|
if [ -z "$MODULE_PCR" ]; then
|
|
MODULE_PCR=5
|
|
fi
|
|
|
|
|
|
if [ -z "$MODULE" ]; then
|
|
die "Usage: $0 module [args...]"
|
|
fi
|
|
|
|
if [ ! -r "$MODULE" ]; then
|
|
die "$MODULE: not found?"
|
|
fi
|
|
|
|
# Check if module is already loaded
|
|
# Transform module name changing _ for - and trailing .ko if present
|
|
# Unify lsmod output to use - instead of _ for comparison
|
|
module_name=$(basename "$MODULE" | sed 's/_/-/g' | sed 's/\.ko$//')
|
|
if lsmod | sed 's/_/-/g' | grep -q "^$module_name\\b"; then
|
|
DEBUG "$MODULE: already loaded, skipping"
|
|
exit 0
|
|
fi
|
|
|
|
if [ ! -r /sys/class/tpm/tpm0/pcrs -o ! -x /bin/tpm ]; then
|
|
if [ ! -c /dev/tpmrm0 -o ! -x /bin/tpm2 ]; then
|
|
tpm_missing=1
|
|
fi
|
|
fi
|
|
|
|
if [ -z "$tpm_missing" ]; then
|
|
LOG "TPM: Extending PCR[$MODULE_PCR] with $MODULE and parameters '$*' before loading"
|
|
# Extend with the module parameters (even if they are empty) and the
|
|
# module. Changing the parameters or the module content will result in a
|
|
# different PCR measurement.
|
|
if [ -n "$*" ]; then
|
|
TRACE_FUNC
|
|
LOG "Extending with module parameters and the module's content"
|
|
tpmr extend -ix "$MODULE_PCR" -ic "$*"
|
|
tpmr extend -ix "$MODULE_PCR" -if "$MODULE" \
|
|
|| die "$MODULE: tpm extend failed"
|
|
else
|
|
TRACE_FUNC
|
|
LOG "No module parameters, extending only with the module's content"
|
|
tpmr extend -ix "$MODULE_PCR" -if "$MODULE" \
|
|
|| die "$MODULE: tpm extend failed"
|
|
fi
|
|
fi
|
|
|
|
# Since we have replaced the real insmod, we must invoke
|
|
# the busybox insmod via the original executable
|
|
DEBUG "Loading $MODULE with busybox insmod"
|
|
busybox insmod "$MODULE" "$@" \
|
|
|| die "$MODULE: insmod failed"
|