| Message ID | 20210921071931.3755-4-masahisa.kojima@linaro.org |
|---|---|
| State | New |
| Headers | show |
| Series | Enhance Measured Boot | expand |
On Tue, 21 Sept 2021 at 10:17, Masahisa Kojima <masahisa.kojima@linaro.org> wrote: > > This commit adds the DeployedMode and AuditMode variable > measurement required in TCG PC Client PFP Spec. > > Signed-off-by: Masahisa Kojima <masahisa.kojima@linaro.org> > --- > > (no changes since v1) > > lib/efi_loader/efi_tcg2.c | 47 +++++++++++++++++++++++++++++++++++++++ > 1 file changed, 47 insertions(+) > > diff --git a/lib/efi_loader/efi_tcg2.c b/lib/efi_loader/efi_tcg2.c > index ea2c1ead03..68542c7cd3 100644 > --- a/lib/efi_loader/efi_tcg2.c > +++ b/lib/efi_loader/efi_tcg2.c > @@ -12,6 +12,7 @@ > #include <dm.h> > #include <efi_loader.h> > #include <efi_tcg2.h> > +#include <efi_variable.h> > #include <log.h> > #include <malloc.h> > #include <smbios.h> > @@ -1828,6 +1829,50 @@ out: > return ret; > } > > +/** > + * tcg2_measure_deployed_audit_mode() - measure deployedmode and auditmode > + * > + * @dev: TPM device > + * > + * Return: status code > + */ > +static efi_status_t tcg2_measure_deployed_audit_mode(struct udevice *dev) > +{ > + u8 deployed_mode; > + u8 audit_mode; > + efi_uintn_t size; > + efi_status_t ret; > + u32 pcr_index; > + > + size = sizeof(deployed_mode); > + ret = efi_get_variable_int(L"DeployedMode", &efi_global_variable_guid, > + NULL, &size, &deployed_mode, NULL); > + if (ret != EFI_SUCCESS) > + return ret; > + > + pcr_index = (deployed_mode ? 1 : 7); > + > + ret = tcg2_measure_variable(dev, pcr_index, > + EV_EFI_VARIABLE_DRIVER_CONFIG, > + L"DeployedMode", > + &efi_global_variable_guid, > + size, &deployed_mode); > + tcg2_measure_variable() can't fail here? Do we care if it does? > + size = sizeof(audit_mode); > + ret = efi_get_variable_int(L"AuditMode", &efi_global_variable_guid, > + NULL, &size, &audit_mode, NULL); > + if (ret != EFI_SUCCESS) > + return ret; > + > + ret = tcg2_measure_variable(dev, pcr_index, > + EV_EFI_VARIABLE_DRIVER_CONFIG, > + L"AuditMode", > + &efi_global_variable_guid, > + size, &audit_mode); > + Does it make sense to read both of the variables first and measure them only if both are present? IOW is there any connection between AuditMode and DeployedMode measurements? Regards /Ilias > + return ret; > +} > + > /** > * tcg2_measure_secure_boot_variable() - measure secure boot variables > * > @@ -1891,6 +1936,8 @@ static efi_status_t tcg2_measure_secure_boot_variable(struct udevice *dev) > free(data); > } > > + ret = tcg2_measure_deployed_audit_mode(dev); > + > error: > return ret; > } > -- > 2.17.1 >
On Mon, 27 Sept 2021 at 22:53, Ilias Apalodimas <ilias.apalodimas@linaro.org> wrote: > > On Tue, 21 Sept 2021 at 10:17, Masahisa Kojima > <masahisa.kojima@linaro.org> wrote: > > > > This commit adds the DeployedMode and AuditMode variable > > measurement required in TCG PC Client PFP Spec. > > > > Signed-off-by: Masahisa Kojima <masahisa.kojima@linaro.org> > > --- > > > > (no changes since v1) > > > > lib/efi_loader/efi_tcg2.c | 47 +++++++++++++++++++++++++++++++++++++++ > > 1 file changed, 47 insertions(+) > > > > diff --git a/lib/efi_loader/efi_tcg2.c b/lib/efi_loader/efi_tcg2.c > > index ea2c1ead03..68542c7cd3 100644 > > --- a/lib/efi_loader/efi_tcg2.c > > +++ b/lib/efi_loader/efi_tcg2.c > > @@ -12,6 +12,7 @@ > > #include <dm.h> > > #include <efi_loader.h> > > #include <efi_tcg2.h> > > +#include <efi_variable.h> > > #include <log.h> > > #include <malloc.h> > > #include <smbios.h> > > @@ -1828,6 +1829,50 @@ out: > > return ret; > > } > > > > +/** > > + * tcg2_measure_deployed_audit_mode() - measure deployedmode and auditmode > > + * > > + * @dev: TPM device > > + * > > + * Return: status code > > + */ > > +static efi_status_t tcg2_measure_deployed_audit_mode(struct udevice *dev) > > +{ > > + u8 deployed_mode; > > + u8 audit_mode; > > + efi_uintn_t size; > > + efi_status_t ret; > > + u32 pcr_index; > > + > > + size = sizeof(deployed_mode); > > + ret = efi_get_variable_int(L"DeployedMode", &efi_global_variable_guid, > > + NULL, &size, &deployed_mode, NULL); > > + if (ret != EFI_SUCCESS) > > + return ret; > > + > > + pcr_index = (deployed_mode ? 1 : 7); > > + > > + ret = tcg2_measure_variable(dev, pcr_index, > > + EV_EFI_VARIABLE_DRIVER_CONFIG, > > + L"DeployedMode", > > + &efi_global_variable_guid, > > + size, &deployed_mode); > > + > > tcg2_measure_variable() can't fail here? Do we care if it does? I will add appropriate error handling. > > > + size = sizeof(audit_mode); > > + ret = efi_get_variable_int(L"AuditMode", &efi_global_variable_guid, > > + NULL, &size, &audit_mode, NULL); > > + if (ret != EFI_SUCCESS) > > + return ret; > > + > > + ret = tcg2_measure_variable(dev, pcr_index, > > + EV_EFI_VARIABLE_DRIVER_CONFIG, > > + L"AuditMode", > > + &efi_global_variable_guid, > > + size, &audit_mode); > > + > > Does it make sense to read both of the variables first and measure > them only if both are present? Yes, it is better. If one of the variable is not present, skip both DeployedMode and AuditMode measurement. > IOW is there any connection between AuditMode and DeployedMode measurements? In UEFI spec: DeployedMode = 1 -> AuditMode is always 0 DeployedMode = 0 -> AuditMode can be 0 or 1 Thanks, Masahisa Kojima > > > Regards > /Ilias > > + return ret; > > +} > > + > > /** > > * tcg2_measure_secure_boot_variable() - measure secure boot variables > > * > > @@ -1891,6 +1936,8 @@ static efi_status_t tcg2_measure_secure_boot_variable(struct udevice *dev) > > free(data); > > } > > > > + ret = tcg2_measure_deployed_audit_mode(dev); > > + > > error: > > return ret; > > } > > -- > > 2.17.1 > >
diff --git a/lib/efi_loader/efi_tcg2.c b/lib/efi_loader/efi_tcg2.c index ea2c1ead03..68542c7cd3 100644 --- a/lib/efi_loader/efi_tcg2.c +++ b/lib/efi_loader/efi_tcg2.c @@ -12,6 +12,7 @@ #include <dm.h> #include <efi_loader.h> #include <efi_tcg2.h> +#include <efi_variable.h> #include <log.h> #include <malloc.h> #include <smbios.h> @@ -1828,6 +1829,50 @@ out: return ret; } +/** + * tcg2_measure_deployed_audit_mode() - measure deployedmode and auditmode + * + * @dev: TPM device + * + * Return: status code + */ +static efi_status_t tcg2_measure_deployed_audit_mode(struct udevice *dev) +{ + u8 deployed_mode; + u8 audit_mode; + efi_uintn_t size; + efi_status_t ret; + u32 pcr_index; + + size = sizeof(deployed_mode); + ret = efi_get_variable_int(L"DeployedMode", &efi_global_variable_guid, + NULL, &size, &deployed_mode, NULL); + if (ret != EFI_SUCCESS) + return ret; + + pcr_index = (deployed_mode ? 1 : 7); + + ret = tcg2_measure_variable(dev, pcr_index, + EV_EFI_VARIABLE_DRIVER_CONFIG, + L"DeployedMode", + &efi_global_variable_guid, + size, &deployed_mode); + + size = sizeof(audit_mode); + ret = efi_get_variable_int(L"AuditMode", &efi_global_variable_guid, + NULL, &size, &audit_mode, NULL); + if (ret != EFI_SUCCESS) + return ret; + + ret = tcg2_measure_variable(dev, pcr_index, + EV_EFI_VARIABLE_DRIVER_CONFIG, + L"AuditMode", + &efi_global_variable_guid, + size, &audit_mode); + + return ret; +} + /** * tcg2_measure_secure_boot_variable() - measure secure boot variables * @@ -1891,6 +1936,8 @@ static efi_status_t tcg2_measure_secure_boot_variable(struct udevice *dev) free(data); } + ret = tcg2_measure_deployed_audit_mode(dev); + error: return ret; }
This commit adds the DeployedMode and AuditMode variable measurement required in TCG PC Client PFP Spec. Signed-off-by: Masahisa Kojima <masahisa.kojima@linaro.org> --- (no changes since v1) lib/efi_loader/efi_tcg2.c | 47 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 47 insertions(+) -- 2.17.1