On Wed, 2024-09-11 at 18:14 +0300, Jarkko Sakkinen wrote:
> On Wed Sep 11, 2024 at 11:53 AM EEST, Roberto Sassu wrote:
> > I made few measurements. I have a Fedora 38 VM with TPM passthrough.
>
> I was thinking more like
>
> sudo bpftrace -e 'k:tpm_transmit { @start[tid] = nsecs; } kr:tpm_transmit { @[kstack, ustack, comm] = sum(nsecs - @start[tid]); delete(@start[tid]); } END { clear(@start); }'
>
> For example when running "tpm2_createprimary --hierarchy o -G rsa2048 -c owner.txt", I get:
Sure:
Without HMAC:
@[
tpm_transmit_cmd+50
tpm2_pcr_extend+295
tpm_pcr_extend+221
ima_add_template_entry+437
ima_store_template+114
ima_store_measurement+209
process_measurement+2473
ima_file_check+82
security_file_post_open+92
path_openat+550
do_filp_open+171
do_sys_openat2+186
do_sys_open+76
__x64_sys_openat+35
x64_sys_call+9589
do_syscall_64+96
entry_SYSCALL_64_after_hwframe+118
,
0x7f338ee7be55
0x55bf24459ac2
0x7f338eda2b8a
0x7f338eda2c4b
0x55bf2445a9b5
, cat]: 5273648
With HMAC:
@[
tpm_transmit_cmd+50
tpm2_flush_context+95
tpm2_start_auth_session+676
tpm2_pcr_extend+39
tpm_pcr_extend+221
ima_add_template_entry+437
ima_store_template+114
ima_store_measurement+209
process_measurement+2473
ima_file_check+82
security_file_post_open+92
path_openat+550
do_filp_open+171
do_sys_openat2+186
do_sys_open+76
__x64_sys_openat+35
x64_sys_call+9589
do_syscall_64+96
entry_SYSCALL_64_after_hwframe+118
,
0x7f03ea0ade55
0x55f929b7dac2
0x7f03e9fd4b8a
0x7f03e9fd4c4b
0x55f929b7e9b5
, cat]: 3128177
@[
tpm_transmit_cmd+50
tpm2_pcr_extend+338
tpm_pcr_extend+221
ima_add_template_entry+437
ima_store_template+114
ima_store_measurement+209
process_measurement+2473
ima_file_check+82
security_file_post_open+92
path_openat+550
do_filp_open+171
do_sys_openat2+186
do_sys_open+76
__x64_sys_openat+35
x64_sys_call+9589
do_syscall_64+96
entry_SYSCALL_64_after_hwframe+118
,
0x7f03ea0ade55
0x55f929b7dac2
0x7f03e9fd4b8a
0x7f03e9fd4c4b
0x55f929b7e9b5
, cat]: 25851638
@[
tpm_transmit_cmd+50
tpm2_load_context+161
tpm2_start_auth_session+98
tpm2_pcr_extend+39
tpm_pcr_extend+221
ima_add_template_entry+437
ima_store_template+114
ima_store_measurement+209
process_measurement+2473
ima_file_check+82
security_file_post_open+92
path_openat+550
do_filp_open+171
do_sys_openat2+186
do_sys_open+76
__x64_sys_openat+35
x64_sys_call+9589
do_syscall_64+96
entry_SYSCALL_64_after_hwframe+118
,
0x7f03ea0ade55
0x55f929b7dac2
0x7f03e9fd4b8a
0x7f03e9fd4c4b
0x55f929b7e9b5
, cat]: 35928108
@[
tpm_transmit_cmd+50
tpm2_start_auth_session+650
tpm2_pcr_extend+39
tpm_pcr_extend+221
ima_add_template_entry+437
ima_store_template+114
ima_store_measurement+209
process_measurement+2473
ima_file_check+82
security_file_post_open+92
path_openat+550
do_filp_open+171
do_sys_openat2+186
do_sys_open+76
__x64_sys_openat+35
x64_sys_call+9589
do_syscall_64+96
entry_SYSCALL_64_after_hwframe+118
,
0x7f03ea0ade55
0x55f929b7dac2
0x7f03e9fd4b8a
0x7f03e9fd4c4b
0x55f929b7e9b5
, cat]: 84616611
Roberto
