On Thu Sep 12, 2024 at 11:13 AM EEST, Roberto Sassu wrote:
> 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
Looking into tomorrow thank you.
BR, Jarkko
