linux-kernel - Re: [regression] significant delays when secureboot is enabled since 6.10

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Message-Id: <D44DGENMPU9S.C2ZOA3EA5LEW@kernel.org>
Date: Thu, 12 Sep 2024 17:23:03 +0300
From: "Jarkko Sakkinen" <jarkko@...nel.org>
To: "Roberto Sassu" <roberto.sassu@...weicloud.com>, "James Bottomley"
 <James.Bottomley@...senPartnership.com>, "Linux regressions mailing list"
 <regressions@...ts.linux.dev>
Cc: <keyrings@...r.kernel.org>, "linux-integrity@...r.kernel.org"
 <linux-integrity@...r.kernel.org>, "LKML" <linux-kernel@...r.kernel.org>,
 "Pengyu Ma" <mapengyu@...il.com>
Subject: Re: [regression] significant delays when secureboot is enabled
 since 6.10

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