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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [PATCH 4/4] stubdom/vtpm: Support multiple backends and locality
On 11/29/2012 02:09 PM, Matthew Fioravante wrote:
> Looks good. I'm actually kind of surprised that the emulator doesn't provide
> an interface to set the requested locality.
It does; however, it's a rather bad interface: you can send a vendor-specific
command to change the entire STANY_FLAGS data structure, which contains the
locality field along with some others that really shouldn't be changed. This
patch restricts that vendor-specific command interface to locality 8, which
can itself be restricted or unavailable once locality restrictions are
implemented. The number 8 was chosen because it's not usable as a quoting
locality since (1<<8) won't fit in uint8_t.
> Acked by: Matthew Fioravante <matthew.fioravante@xxxxxxxxxx>
>
> On 11/27/2012 10:14 AM, Daniel De Graaf wrote:
>> The vTPM protocol now contains a field allowing the locality of a
>> command to be specified; pass this to the TPM when processing a packet.
>> This also enables a single vTPM to provide multiple tpmback interfaces
>> so that several closely related domains can share a vTPM (for example, a
>> qemu device stubdom and its target domain).
>>
>> Signed-off-by: Daniel De Graaf <dgdegra@xxxxxxxxxxxxx>
>> ---
>> stubdom/tpmemu-0.7.4.patch | 61
>> ++++++++++++++++++++++++++++++++++++++++++----
>> stubdom/vtpm/vtpm.c | 16 +++---------
>> 2 files changed, 59 insertions(+), 18 deletions(-)
>>
>> diff --git a/stubdom/tpmemu-0.7.4.patch b/stubdom/tpmemu-0.7.4.patch
>> index b84eff1..31ace1a 100644
>> --- a/stubdom/tpmemu-0.7.4.patch
>> +++ b/stubdom/tpmemu-0.7.4.patch
>> @@ -1,9 +1,60 @@
>> -diff -Naur tpm_emulator-x86_64-back/tpm/tpm_emulator_extern.c
>> tpm_emulator-x86_64/tpm/tpm_emulator_extern.c
>> ---- tpm_emulator-x86_64-back/tpm/tpm_emulator_extern.c 2012-04-27
>> 10:55:46.581963398 -0400
>> -+++ tpm_emulator-x86_64/tpm/tpm_emulator_extern.c 2012-04-27
>> 10:56:02.193034152 -0400
>> -@@ -249,7 +249,7 @@
>> +diff --git a/tpm/tpm_capability.c b/tpm/tpm_capability.c
>> +index 60bbb90..f8f7f0f 100644
>> +--- a/tpm/tpm_capability.c
>> ++++ b/tpm/tpm_capability.c
>> +@@ -949,6 +949,8 @@ static TPM_RESULT set_vendor(UINT32 subCap, BYTE
>> *setValue,
>> + UINT32 setValueSize, BOOL ownerAuth,
>> + BOOL deactivated, BOOL disabled)
>> + {
>> ++ if (tpmData.stany.flags.localityModifier != 8)
>> ++ return TPM_BAD_PARAMETER;
>> + /* set the capability area with the specified data, on failure
>> + deactivate the TPM */
>> + switch (subCap) {
>> +diff --git a/tpm/tpm_cmd_handler.c b/tpm/tpm_cmd_handler.c
>> +index 288d1ce..9e1cfb4 100644
>> +--- a/tpm/tpm_cmd_handler.c
>> ++++ b/tpm/tpm_cmd_handler.c
>> +@@ -4132,7 +4132,7 @@ void tpm_emulator_shutdown()
>> + tpm_extern_release();
>> + }
>> +
>> +-int tpm_handle_command(const uint8_t *in, uint32_t in_size, uint8_t **out,
>> uint32_t *out_size)
>> ++int tpm_handle_command(const uint8_t *in, uint32_t in_size, uint8_t **out,
>> uint32_t *out_size, int locality)
>> + {
>> + TPM_REQUEST req;
>> + TPM_RESPONSE rsp;
>> +@@ -4140,7 +4140,9 @@ int tpm_handle_command(const uint8_t *in, uint32_t
>> in_size, uint8_t **out, uint3
>> + UINT32 len;
>> + BOOL free_out;
>> +
>> +- debug("tpm_handle_command()");
>> ++ debug("tpm_handle_command(%d)", locality);
>> ++ if (locality != -1)
>> ++ tpmData.stany.flags.localityModifier = locality;
>> +
>> + /* we need the whole packet at once, otherwise unmarshalling will fail */
>> + if (tpm_unmarshal_TPM_REQUEST((uint8_t**)&in, &in_size, &req) != 0) {
>> +diff --git a/tpm/tpm_emulator.h b/tpm/tpm_emulator.h
>> +index eed749e..4c228bd 100644
>> +--- a/tpm/tpm_emulator.h
>> ++++ b/tpm/tpm_emulator.h
>> +@@ -59,7 +59,7 @@ void tpm_emulator_shutdown(void);
>> + * its usage. In case of an error, all internally allocated memory
>> + * is released and the the state of out and out_size is unspecified.
>> + */
>> +-int tpm_handle_command(const uint8_t *in, uint32_t in_size, uint8_t **out,
>> uint32_t *out_size);
>> ++int tpm_handle_command(const uint8_t *in, uint32_t in_size, uint8_t **out,
>> uint32_t *out_size, int locality);
>> +
>> + #endif /* _TPM_EMULATOR_H_ */
>> +
>> +diff --git a/tpm/tpm_emulator_extern.c b/tpm/tpm_emulator_extern.c
>> +index aabe6c3..440a01b 100644
>> +--- a/tpm/tpm_emulator_extern.c
>> ++++ b/tpm/tpm_emulator_extern.c
>> +@@ -249,7 +249,7 @@ int (*tpm_read_from_storage)(uint8_t **data, size_t
>> *data_length) = _tpm_read_fr
>> #else /* TPM_NO_EXTERN */
>> -
>> +
>> int (*tpm_extern_init)(void) = NULL;
>> -int (*tpm_extern_release)(void) = NULL;
>> +void (*tpm_extern_release)(void) = NULL;
>> diff --git a/stubdom/vtpm/vtpm.c b/stubdom/vtpm/vtpm.c
>> index c33e078..dcfc3b9 100644
>> --- a/stubdom/vtpm/vtpm.c
>> +++ b/stubdom/vtpm/vtpm.c
>> @@ -141,8 +141,6 @@ int check_ordinal(tpmcmd_t* tpmcmd) {
>> static void main_loop(void) {
>> tpmcmd_t* tpmcmd = NULL;
>> - domid_t domid; /* Domid of frontend */
>> - unsigned int handle; /* handle of frontend */
>> int res = -1;
>> info("VTPM Initializing\n");
>> @@ -162,15 +160,7 @@ static void main_loop(void) {
>> goto abort_postpcrs;
>> }
>> - /* Wait for the frontend domain to connect */
>> - info("Waiting for frontend domain to connect..");
>> - if(tpmback_wait_for_frontend_connect(&domid, &handle) == 0) {
>> - info("VTPM attached to Frontend %u/%u", (unsigned int) domid, handle);
>> - } else {
>> - error("Unable to attach to a frontend");
>> - }
>> -
>> - tpmcmd = tpmback_req(domid, handle);
>> + tpmcmd = tpmback_req_any();
>> while(tpmcmd) {
>> /* Handle the request */
>> if(tpmcmd->req_len) {
>> @@ -183,7 +173,7 @@ static void main_loop(void) {
>> }
>> /* If not disabled, do the command */
>> else {
>> - if((res = tpm_handle_command(tpmcmd->req, tpmcmd->req_len,
>> &tpmcmd->resp, &tpmcmd->resp_len)) != 0) {
>> + if((res = tpm_handle_command(tpmcmd->req, tpmcmd->req_len,
>> &tpmcmd->resp, &tpmcmd->resp_len, tpmcmd->locality)) != 0) {
>> error("tpm_handle_command() failed");
>> create_error_response(tpmcmd, TPM_FAIL);
>> }
>> @@ -194,7 +184,7 @@ static void main_loop(void) {
>> tpmback_resp(tpmcmd);
>> /* Wait for the next request */
>> - tpmcmd = tpmback_req(domid, handle);
>> + tpmcmd = tpmback_req_any();
>> }
>>
>
>
--
Daniel De Graaf
National Security Agency
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