[PATCH 1/2] tpm: Fix return code, if the eventlog buffer is full
We currently return 'No space left on device' if the eventlong buffer we allocated is not enough. On a similar check later on that function during the call to tcg2_log_init() we return 'No buffer space available'. So switch both error codes to -ENOBUFS since we are always checking a buffer and not a device.
Fixes: 97707f12fdab ("tpm: Support boot measurements") Signed-off-by: Ilias Apalodimas ilias.apalodimas@linaro.org --- lib/tpm-v2.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/lib/tpm-v2.c b/lib/tpm-v2.c index a67daed2f3c1..91526af33acb 100644 --- a/lib/tpm-v2.c +++ b/lib/tpm-v2.c @@ -554,7 +554,7 @@ int tcg2_log_prepare_buffer(struct udevice *dev, struct tcg2_event_log *elog, if (elog->log_size) { if (log.found) { if (elog->log_size < log.log_position) - return -ENOSPC; + return -ENOBUFS;
/* * Copy the discovered log into the user buffer
A while back we moved the core functions of the EFI TCG protocol to the TPM APIs in order for them to be used with bootm, booti etc. Some prototypes changed from returning efi_status_t to int, which is more appropriate for the non-EFI APIs. However, some of the EFI callsites never changed and we ended up assigning the int value to efi_status_t.
This is unlikely to cause any problems, apart from returning invalid values on failures and violating the EFI spec. Let's fix them by looking at the new return code and map it to the proper EFI return code on failures.
Fixes: commit 97707f12fdab ("tpm: Support boot measurements") Fixes: commit d6b55a420cfc ("efi_loader: startup the tpm device when installing the protocol") Signed-off-by: Ilias Apalodimas ilias.apalodimas@linaro.org --- lib/efi_loader/efi_tcg2.c | 121 ++++++++++++++++++++------------------ 1 file changed, 64 insertions(+), 57 deletions(-)
diff --git a/lib/efi_loader/efi_tcg2.c b/lib/efi_loader/efi_tcg2.c index 51264c1b998c..37783942d716 100644 --- a/lib/efi_loader/efi_tcg2.c +++ b/lib/efi_loader/efi_tcg2.c @@ -254,8 +254,8 @@ efi_tcg2_get_capability(struct efi_tcg2_protocol *this, capability->protocol_version.major = 1; capability->protocol_version.minor = 1;
- efi_ret = tcg2_platform_get_tpm2(&dev); - if (efi_ret != EFI_SUCCESS) { + ret = tcg2_platform_get_tpm2(&dev); + if (ret) { capability->supported_event_logs = 0; capability->hash_algorithm_bitmap = 0; capability->tpm_present_flag = false; @@ -350,8 +350,7 @@ efi_tcg2_get_eventlog(struct efi_tcg2_protocol *this, goto out; }
- ret = tcg2_platform_get_tpm2(&dev); - if (ret != EFI_SUCCESS) { + if (tcg2_platform_get_tpm2(&dev)) { event_log_location = NULL; event_log_last_entry = NULL; *event_log_truncated = false; @@ -386,7 +385,7 @@ static efi_status_t tcg2_hash_pe_image(void *efi, u64 efi_size, void *new_efi = NULL; u8 hash[TPM2_SHA512_DIGEST_SIZE]; struct udevice *dev; - efi_status_t ret; + efi_status_t ret = EFI_SUCCESS; u32 active; int i;
@@ -401,12 +400,13 @@ static efi_status_t tcg2_hash_pe_image(void *efi, u64 efi_size, goto out; }
- ret = tcg2_platform_get_tpm2(&dev); - if (ret != EFI_SUCCESS) + if (tcg2_platform_get_tpm2(&dev)) { + ret = EFI_DEVICE_ERROR; goto out; + }
- ret = tcg2_get_active_pcr_banks(dev, &active); - if (ret != EFI_SUCCESS) { + if (tcg2_get_active_pcr_banks(dev, &active)) { + ret = EFI_DEVICE_ERROR; goto out; }
@@ -470,12 +470,12 @@ efi_status_t tcg2_measure_pe_image(void *efi, u64 efi_size, IMAGE_DOS_HEADER *dos; IMAGE_NT_HEADERS32 *nt; struct efi_handler *handler; + int rc;
if (!is_tcg2_protocol_installed()) return EFI_SUCCESS;
- ret = tcg2_platform_get_tpm2(&dev); - if (ret != EFI_SUCCESS) + if (tcg2_platform_get_tpm2(&dev)) return EFI_SECURITY_VIOLATION;
switch (handle->image_type) { @@ -499,9 +499,9 @@ efi_status_t tcg2_measure_pe_image(void *efi, u64 efi_size, if (ret != EFI_SUCCESS) return ret;
- ret = tcg2_pcr_extend(dev, pcr_index, &digest_list); - if (ret != EFI_SUCCESS) - return ret; + rc = tcg2_pcr_extend(dev, pcr_index, &digest_list); + if (rc) + return EFI_DEVICE_ERROR;
ret = efi_search_protocol(&handle->header, &efi_guid_loaded_image_device_path, &handler); @@ -571,9 +571,10 @@ efi_tcg2_hash_log_extend_event(struct efi_tcg2_protocol *this, u64 flags, struct efi_tcg2_event *efi_tcg_event) { struct udevice *dev; - efi_status_t ret; + efi_status_t ret = EFI_SUCCESS; u32 event_type, pcr_index, event_size; struct tpml_digest_values digest_list; + int rc = 0;
EFI_ENTRY("%p, %llu, %llu, %llu, %p", this, flags, data_to_hash, data_to_hash_len, efi_tcg_event); @@ -583,9 +584,10 @@ efi_tcg2_hash_log_extend_event(struct efi_tcg2_protocol *this, u64 flags, goto out; }
- ret = tcg2_platform_get_tpm2(&dev); - if (ret != EFI_SUCCESS) + if (tcg2_platform_get_tpm2(&dev)) { + ret = EFI_DEVICE_ERROR; goto out; + }
if (efi_tcg_event->size < efi_tcg_event->header.header_size + sizeof(u32)) { @@ -618,8 +620,10 @@ efi_tcg2_hash_log_extend_event(struct efi_tcg2_protocol *this, u64 flags, ret = tcg2_hash_pe_image((void *)(uintptr_t)data_to_hash, data_to_hash_len, &digest_list); } else { - ret = tcg2_create_digest(dev, (u8 *)(uintptr_t)data_to_hash, - data_to_hash_len, &digest_list); + rc = tcg2_create_digest(dev, (u8 *)(uintptr_t)data_to_hash, + data_to_hash_len, &digest_list); + if (rc) + ret = EFI_DEVICE_ERROR; }
if (ret != EFI_SUCCESS) @@ -628,9 +632,11 @@ efi_tcg2_hash_log_extend_event(struct efi_tcg2_protocol *this, u64 flags, pcr_index = efi_tcg_event->header.pcr_index; event_type = efi_tcg_event->header.event_type;
- ret = tcg2_pcr_extend(dev, pcr_index, &digest_list); - if (ret != EFI_SUCCESS) + rc = tcg2_pcr_extend(dev, pcr_index, &digest_list); + if (rc) { + ret = EFI_DEVICE_ERROR; goto out; + }
if (flags & EFI_TCG2_EXTEND_ONLY) { if (event_log.truncated) @@ -669,7 +675,7 @@ efi_tcg2_submit_command(struct efi_tcg2_protocol *this, u8 *output_param_block) { struct udevice *dev; - efi_status_t ret; + efi_status_t ret = EFI_SUCCESS; u32 rc; size_t resp_buf_size = output_param_block_size;
@@ -681,9 +687,10 @@ efi_tcg2_submit_command(struct efi_tcg2_protocol *this, goto out; }
- ret = tcg2_platform_get_tpm2(&dev); - if (ret != EFI_SUCCESS) + if (tcg2_platform_get_tpm2(&dev)) { + ret = EFI_DEVICE_ERROR; goto out; + }
rc = tpm2_submit_command(dev, input_param_block, output_param_block, &resp_buf_size); @@ -711,19 +718,20 @@ efi_tcg2_get_active_pcr_banks(struct efi_tcg2_protocol *this, u32 *active_pcr_banks) { struct udevice *dev; - efi_status_t ret; + efi_status_t ret = EFI_INVALID_PARAMETER;
EFI_ENTRY("%p, %p", this, active_pcr_banks);
- if (!this || !active_pcr_banks) { - ret = EFI_INVALID_PARAMETER; + if (!this || !active_pcr_banks) goto out; - } - ret = tcg2_platform_get_tpm2(&dev); - if (ret != EFI_SUCCESS) + + if (tcg2_platform_get_tpm2(&dev)) + goto out; + + if (tcg2_get_active_pcr_banks(dev, active_pcr_banks)) goto out;
- ret = tcg2_get_active_pcr_banks(dev, active_pcr_banks); + ret = EFI_SUCCESS;
out: return EFI_EXIT(ret); @@ -849,14 +857,15 @@ static efi_status_t measure_event(struct udevice *dev, u32 pcr_index, u32 event_type, u32 size, u8 event[]) { struct tpml_digest_values digest_list; - efi_status_t ret; + efi_status_t ret = EFI_DEVICE_ERROR; + int rc;
- ret = tcg2_create_digest(dev, event, size, &digest_list); - if (ret != EFI_SUCCESS) + rc = tcg2_create_digest(dev, event, size, &digest_list); + if (rc) goto out;
- ret = tcg2_pcr_extend(dev, pcr_index, &digest_list); - if (ret != EFI_SUCCESS) + rc = tcg2_pcr_extend(dev, pcr_index, &digest_list); + if (rc) goto out;
ret = tcg2_agile_log_append(pcr_index, event_type, &digest_list, @@ -898,10 +907,10 @@ static efi_status_t efi_init_event_log(void) struct tcg2_event_log elog; struct udevice *dev; efi_status_t ret; + int rc;
- ret = tcg2_platform_get_tpm2(&dev); - if (ret != EFI_SUCCESS) - return ret; + if (tcg2_platform_get_tpm2(&dev)) + return EFI_DEVICE_ERROR;
ret = efi_allocate_pool(EFI_BOOT_SERVICES_DATA, TPM2_EVENT_LOG_SIZE, (void **)&event_log.buffer); @@ -930,9 +939,11 @@ static efi_status_t efi_init_event_log(void) */ elog.log = event_log.buffer; elog.log_size = TPM2_EVENT_LOG_SIZE; - ret = tcg2_log_prepare_buffer(dev, &elog, false); - if (ret != EFI_SUCCESS) + rc = tcg2_log_prepare_buffer(dev, &elog, false); + if (rc) { + ret = (rc == -ENOBUFS) ? EFI_BUFFER_TOO_SMALL : EFI_DEVICE_ERROR; goto free_pool; + }
event_log.pos = elog.log_position;
@@ -1303,8 +1314,7 @@ efi_status_t efi_tcg2_measure_dtb(void *dtb) if (!is_tcg2_protocol_installed()) return EFI_SUCCESS;
- ret = tcg2_platform_get_tpm2(&dev); - if (ret != EFI_SUCCESS) + if (tcg2_platform_get_tpm2(&dev)) return EFI_SECURITY_VIOLATION;
rsvmap_size = size_of_rsvmap(dtb); @@ -1353,8 +1363,7 @@ efi_status_t efi_tcg2_measure_efi_app_invocation(struct efi_loaded_image_obj *ha if (tcg2_efi_app_invoked) return EFI_SUCCESS;
- ret = tcg2_platform_get_tpm2(&dev); - if (ret != EFI_SUCCESS) + if (tcg2_platform_get_tpm2(&dev)) return EFI_SECURITY_VIOLATION;
ret = tcg2_measure_boot_variable(dev); @@ -1403,9 +1412,8 @@ efi_status_t efi_tcg2_measure_efi_app_exit(void) if (!is_tcg2_protocol_installed()) return EFI_SUCCESS;
- ret = tcg2_platform_get_tpm2(&dev); - if (ret != EFI_SUCCESS) - return ret; + if (tcg2_platform_get_tpm2(&dev)) + return EFI_SECURITY_VIOLATION;
ret = measure_event(dev, 4, EV_EFI_ACTION, strlen(EFI_RETURNING_FROM_EFI_APPLICATION), @@ -1434,9 +1442,10 @@ efi_tcg2_notify_exit_boot_services(struct efi_event *event, void *context) goto out; }
- ret = tcg2_platform_get_tpm2(&dev); - if (ret != EFI_SUCCESS) + if (tcg2_platform_get_tpm2(&dev)) { + ret = EFI_SECURITY_VIOLATION; goto out; + }
ret = measure_event(dev, 5, EV_EFI_ACTION, strlen(EFI_EXIT_BOOT_SERVICES_INVOCATION), @@ -1466,9 +1475,8 @@ efi_status_t efi_tcg2_notify_exit_boot_services_failed(void) if (!is_tcg2_protocol_installed()) return EFI_SUCCESS;
- ret = tcg2_platform_get_tpm2(&dev); - if (ret != EFI_SUCCESS) - goto out; + if (tcg2_platform_get_tpm2(&dev)) + return EFI_SECURITY_VIOLATION;
ret = measure_event(dev, 5, EV_EFI_ACTION, strlen(EFI_EXIT_BOOT_SERVICES_INVOCATION), @@ -1548,8 +1556,7 @@ efi_status_t efi_tcg2_do_initial_measurement(void) if (!is_tcg2_protocol_installed()) return EFI_SUCCESS;
- ret = tcg2_platform_get_tpm2(&dev); - if (ret != EFI_SUCCESS) + if (tcg2_platform_get_tpm2(&dev)) return EFI_SECURITY_VIOLATION;
ret = tcg2_measure_secure_boot_variable(dev); @@ -1574,8 +1581,7 @@ efi_status_t efi_tcg2_register(void) struct efi_event *event; u32 err;
- ret = tcg2_platform_get_tpm2(&dev); - if (ret != EFI_SUCCESS) { + if (tcg2_platform_get_tpm2(&dev)) { log_warning("Missing TPMv2 device for EFI_TCG_PROTOCOL\n"); return EFI_SUCCESS; } @@ -1583,6 +1589,7 @@ efi_status_t efi_tcg2_register(void) /* initialize the TPM as early as possible. */ err = tpm_auto_start(dev); if (err) { + ret = EFI_DEVICE_ERROR; log_err("TPM startup failed\n"); goto fail; }
On Thu, 20 Jun 2024 at 22:16, Ilias Apalodimas ilias.apalodimas@linaro.org wrote:
We currently return 'No space left on device' if the eventlong buffer we allocated is not enough. On a similar check later on that function during the call to tcg2_log_init() we return 'No buffer space available'. So switch both error codes to -ENOBUFS since we are always checking a buffer and not a device.
Fixes: 97707f12fdab ("tpm: Support boot measurements")
and now I wonder why checkpatch didn't warn on this. There's a 'commit' missing after the Fixes tag. Sorry!
Signed-off-by: Ilias Apalodimas ilias.apalodimas@linaro.org
lib/tpm-v2.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/lib/tpm-v2.c b/lib/tpm-v2.c index a67daed2f3c1..91526af33acb 100644 --- a/lib/tpm-v2.c +++ b/lib/tpm-v2.c @@ -554,7 +554,7 @@ int tcg2_log_prepare_buffer(struct udevice *dev, struct tcg2_event_log *elog, if (elog->log_size) { if (log.found) { if (elog->log_size < log.log_position)
return -ENOSPC;
return -ENOBUFS; /* * Copy the discovered log into the user buffer-- 2.45.2
On Thu, 20 Jun 2024 at 22:19, Ilias Apalodimas ilias.apalodimas@linaro.org wrote:
On Thu, 20 Jun 2024 at 22:16, Ilias Apalodimas ilias.apalodimas@linaro.org wrote:
We currently return 'No space left on device' if the eventlong buffer we allocated is not enough. On a similar check later on that function during the call to tcg2_log_init() we return 'No buffer space available'. So switch both error codes to -ENOBUFS since we are always checking a buffer and not a device.
Fixes: 97707f12fdab ("tpm: Support boot measurements")
and now I wonder why checkpatch didn't warn on this. There's a 'commit' missing after the Fixes tag. Sorry!
Signed-off-by: Ilias Apalodimas ilias.apalodimas@linaro.org
lib/tpm-v2.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/lib/tpm-v2.c b/lib/tpm-v2.c index a67daed2f3c1..91526af33acb 100644 --- a/lib/tpm-v2.c +++ b/lib/tpm-v2.c @@ -554,7 +554,7 @@ int tcg2_log_prepare_buffer(struct udevice *dev, struct tcg2_event_log *elog, if (elog->log_size) { if (log.found) { if (elog->log_size < log.log_position)
return -ENOSPC;
return -ENOBUFS; /* * Copy the discovered log into the user buffer-- 2.45.2
This is now included in https://lore.kernel.org/u-boot/20240622143601.187723-1-ilias.apalodimas@lina...
Cheers /Ilias
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Ilias Apalodimas