diff options
| -rw-r--r-- | include/efi_variable.h | 74 | ||||
| -rw-r--r-- | lib/efi_loader/Makefile | 2 | ||||
| -rw-r--r-- | lib/efi_loader/efi_var_common.c | 22 | ||||
| -rw-r--r-- | lib/efi_loader/efi_var_file.c | 25 | ||||
| -rw-r--r-- | lib/efi_loader/efi_var_mem.c | 70 | ||||
| -rw-r--r-- | lib/efi_loader/efi_variable.c | 101 | ||||
| -rw-r--r-- | lib/efi_loader/efi_variable_tee.c | 82 |
7 files changed, 222 insertions, 154 deletions
diff --git a/include/efi_variable.h b/include/efi_variable.h index 2c629e4dca..60491cb640 100644 --- a/include/efi_variable.h +++ b/include/efi_variable.h @@ -143,6 +143,22 @@ struct efi_var_file { efi_status_t efi_var_to_file(void); /** + * efi_var_collect() - collect variables in buffer + * + * A buffer is allocated and filled with variables in a format ready to be + * written to disk. + * + * @bufp: pointer to pointer of buffer with collected variables + * @lenp: pointer to length of buffer + * @check_attr_mask: bitmask with required attributes of variables to be collected. + * variables are only collected if all of the required + * attributes are set. + * Return: status code + */ +efi_status_t __maybe_unused efi_var_collect(struct efi_var_file **bufp, loff_t *lenp, + u32 check_attr_mask); + +/** * efi_var_restore() - restore EFI variables from buffer * * @buf: buffer @@ -233,4 +249,62 @@ efi_status_t efi_init_secure_state(void); */ enum efi_auth_var_type efi_auth_var_get_type(u16 *name, const efi_guid_t *guid); +/** + * efi_get_next_variable_name_mem() - Runtime common code across efi variable + * implementations for GetNextVariable() + * from the cached memory copy + * @variable_name_size: size of variable_name buffer in byte + * @variable_name: name of uefi variable's name in u16 + * @vendor: vendor's guid + * + * Return: status code + */ +efi_status_t __efi_runtime +efi_get_next_variable_name_mem(efi_uintn_t *variable_name_size, u16 *variable_name, + efi_guid_t *vendor); +/** + * efi_get_variable_mem() - Runtime common code across efi variable + * implementations for GetVariable() from + * the cached memory copy + * + * @variable_name: name of the variable + * @vendor: vendor GUID + * @attributes: attributes of the variable + * @data_size: size of the buffer to which the variable value is copied + * @data: buffer to which the variable value is copied + * @timep: authentication time (seconds since start of epoch) + * Return: status code + + */ +efi_status_t __efi_runtime +efi_get_variable_mem(u16 *variable_name, const efi_guid_t *vendor, u32 *attributes, + efi_uintn_t *data_size, void *data, u64 *timep); + +/** + * efi_get_variable_runtime() - runtime implementation of GetVariable() + * + * @variable_name: name of the variable + * @guid: vendor GUID + * @attributes: attributes of the variable + * @data_size: size of the buffer to which the variable value is copied + * @data: buffer to which the variable value is copied + * Return: status code + */ +efi_status_t __efi_runtime EFIAPI +efi_get_variable_runtime(u16 *variable_name, const efi_guid_t *guid, + u32 *attributes, efi_uintn_t *data_size, void *data); + +/** + * efi_get_next_variable_name_runtime() - runtime implementation of + * GetNextVariable() + * + * @variable_name_size: size of variable_name buffer in byte + * @variable_name: name of uefi variable's name in u16 + * @guid: vendor's guid + * Return: status code + */ +efi_status_t __efi_runtime EFIAPI +efi_get_next_variable_name_runtime(efi_uintn_t *variable_name_size, + u16 *variable_name, efi_guid_t *guid); + #endif diff --git a/lib/efi_loader/Makefile b/lib/efi_loader/Makefile index 441ac9432e..9bad1d159b 100644 --- a/lib/efi_loader/Makefile +++ b/lib/efi_loader/Makefile @@ -37,11 +37,11 @@ obj-y += efi_setup.o obj-$(CONFIG_EFI_UNICODE_COLLATION_PROTOCOL2) += efi_unicode_collation.o obj-y += efi_var_common.o obj-y += efi_var_mem.o +obj-y += efi_var_file.o ifeq ($(CONFIG_EFI_MM_COMM_TEE),y) obj-y += efi_variable_tee.o else obj-y += efi_variable.o -obj-y += efi_var_file.o obj-$(CONFIG_EFI_VARIABLES_PRESEED) += efi_var_seed.o endif obj-y += efi_watchdog.o diff --git a/lib/efi_loader/efi_var_common.c b/lib/efi_loader/efi_var_common.c index ee2e67bc8c..453cbce5c8 100644 --- a/lib/efi_loader/efi_var_common.c +++ b/lib/efi_loader/efi_var_common.c @@ -166,6 +166,28 @@ efi_status_t EFIAPI efi_query_variable_info( return EFI_EXIT(ret); } +efi_status_t __efi_runtime EFIAPI +efi_get_variable_runtime(u16 *variable_name, const efi_guid_t *guid, + u32 *attributes, efi_uintn_t *data_size, void *data) +{ + efi_status_t ret; + + ret = efi_get_variable_mem(variable_name, guid, attributes, data_size, data, NULL); + + /* Remove EFI_VARIABLE_READ_ONLY flag */ + if (attributes) + *attributes &= EFI_VARIABLE_MASK; + + return ret; +} + +efi_status_t __efi_runtime EFIAPI +efi_get_next_variable_name_runtime(efi_uintn_t *variable_name_size, + u16 *variable_name, efi_guid_t *guid) +{ + return efi_get_next_variable_name_mem(variable_name_size, variable_name, guid); +} + /** * efi_set_secure_state - modify secure boot state variables * @secure_boot: value of SecureBoot diff --git a/lib/efi_loader/efi_var_file.c b/lib/efi_loader/efi_var_file.c index 6f9d76f2a2..b171d2d1a8 100644 --- a/lib/efi_loader/efi_var_file.c +++ b/lib/efi_loader/efi_var_file.c @@ -46,18 +46,8 @@ static efi_status_t __maybe_unused efi_set_blk_dev_to_system_partition(void) return EFI_SUCCESS; } -/** - * efi_var_collect() - collect non-volatile variables in buffer - * - * A buffer is allocated and filled with all non-volatile variables in a - * format ready to be written to disk. - * - * @bufp: pointer to pointer of buffer with collected variables - * @lenp: pointer to length of buffer - * Return: status code - */ -static efi_status_t __maybe_unused efi_var_collect(struct efi_var_file **bufp, - loff_t *lenp) +efi_status_t __maybe_unused efi_var_collect(struct efi_var_file **bufp, loff_t *lenp, + u32 check_attr_mask) { size_t len = EFI_VAR_BUF_SIZE; struct efi_var_file *buf; @@ -102,11 +92,10 @@ static efi_status_t __maybe_unused efi_var_collect(struct efi_var_file **bufp, free(buf); return ret; } - if (!(var->attr & EFI_VARIABLE_NON_VOLATILE)) - continue; - var->length = data_length; - var = (struct efi_var_entry *) - ALIGN((uintptr_t)data + data_length, 8); + if ((var->attr & check_attr_mask) == check_attr_mask) { + var->length = data_length; + var = (struct efi_var_entry *)ALIGN((uintptr_t)data + data_length, 8); + } } buf->reserved = 0; @@ -137,7 +126,7 @@ efi_status_t efi_var_to_file(void) loff_t actlen; int r; - ret = efi_var_collect(&buf, &len); + ret = efi_var_collect(&buf, &len, EFI_VARIABLE_NON_VOLATILE); if (ret != EFI_SUCCESS) goto error; diff --git a/lib/efi_loader/efi_var_mem.c b/lib/efi_loader/efi_var_mem.c index bfa8a56a8f..8f4a5a5e47 100644 --- a/lib/efi_loader/efi_var_mem.c +++ b/lib/efi_loader/efi_var_mem.c @@ -10,7 +10,7 @@ #include <efi_variable.h> #include <u-boot/crc.h> -static struct efi_var_file __efi_runtime_data *efi_var_buf; +struct efi_var_file __efi_runtime_data *efi_var_buf; static struct efi_var_entry __efi_runtime_data *efi_current_var; /** @@ -266,3 +266,71 @@ efi_status_t efi_var_mem_init(void) return ret; return ret; } + +efi_status_t __efi_runtime +efi_get_variable_mem(u16 *variable_name, const efi_guid_t *vendor, u32 *attributes, + efi_uintn_t *data_size, void *data, u64 *timep) +{ + efi_uintn_t old_size; + struct efi_var_entry *var; + u16 *pdata; + + if (!variable_name || !vendor || !data_size) + return EFI_INVALID_PARAMETER; + var = efi_var_mem_find(vendor, variable_name, NULL); + if (!var) + return EFI_NOT_FOUND; + + if (attributes) + *attributes = var->attr; + if (timep) + *timep = var->time; + + old_size = *data_size; + *data_size = var->length; + if (old_size < var->length) + return EFI_BUFFER_TOO_SMALL; + + if (!data) + return EFI_INVALID_PARAMETER; + + for (pdata = var->name; *pdata; ++pdata) + ; + ++pdata; + + efi_memcpy_runtime(data, pdata, var->length); + + return EFI_SUCCESS; +} + +efi_status_t __efi_runtime +efi_get_next_variable_name_mem(efi_uintn_t *variable_name_size, u16 *variable_name, + efi_guid_t *vendor) +{ + struct efi_var_entry *var; + efi_uintn_t old_size; + u16 *pdata; + + if (!variable_name_size || !variable_name || !vendor) + return EFI_INVALID_PARAMETER; + + efi_var_mem_find(vendor, variable_name, &var); + + if (!var) + return EFI_NOT_FOUND; + + for (pdata = var->name; *pdata; ++pdata) + ; + ++pdata; + + old_size = *variable_name_size; + *variable_name_size = (uintptr_t)pdata - (uintptr_t)var->name; + + if (old_size < *variable_name_size) + return EFI_BUFFER_TOO_SMALL; + + efi_memcpy_runtime(variable_name, var->name, *variable_name_size); + efi_memcpy_runtime(vendor, &var->guid, sizeof(efi_guid_t)); + + return EFI_SUCCESS; +} diff --git a/lib/efi_loader/efi_variable.c b/lib/efi_loader/efi_variable.c index 39a8482903..e509d6dbf0 100644 --- a/lib/efi_loader/efi_variable.c +++ b/lib/efi_loader/efi_variable.c @@ -282,68 +282,14 @@ efi_get_variable_int(u16 *variable_name, const efi_guid_t *vendor, u32 *attributes, efi_uintn_t *data_size, void *data, u64 *timep) { - efi_uintn_t old_size; - struct efi_var_entry *var; - u16 *pdata; - - if (!variable_name || !vendor || !data_size) - return EFI_INVALID_PARAMETER; - var = efi_var_mem_find(vendor, variable_name, NULL); - if (!var) - return EFI_NOT_FOUND; - - if (attributes) - *attributes = var->attr; - if (timep) - *timep = var->time; - - old_size = *data_size; - *data_size = var->length; - if (old_size < var->length) - return EFI_BUFFER_TOO_SMALL; - - if (!data) - return EFI_INVALID_PARAMETER; - - for (pdata = var->name; *pdata; ++pdata) - ; - ++pdata; - - efi_memcpy_runtime(data, pdata, var->length); - - return EFI_SUCCESS; + return efi_get_variable_mem(variable_name, vendor, attributes, data_size, data, timep); } efi_status_t __efi_runtime efi_get_next_variable_name_int(efi_uintn_t *variable_name_size, u16 *variable_name, efi_guid_t *vendor) { - struct efi_var_entry *var; - efi_uintn_t old_size; - u16 *pdata; - - if (!variable_name_size || !variable_name || !vendor) - return EFI_INVALID_PARAMETER; - - efi_var_mem_find(vendor, variable_name, &var); - - if (!var) - return EFI_NOT_FOUND; - - for (pdata = var->name; *pdata; ++pdata) - ; - ++pdata; - - old_size = *variable_name_size; - *variable_name_size = (uintptr_t)pdata - (uintptr_t)var->name; - - if (old_size < *variable_name_size) - return EFI_BUFFER_TOO_SMALL; - - efi_memcpy_runtime(variable_name, var->name, *variable_name_size); - efi_memcpy_runtime(vendor, &var->guid, sizeof(efi_guid_t)); - - return EFI_SUCCESS; + return efi_get_next_variable_name_mem(variable_name_size, variable_name, vendor); } efi_status_t efi_set_variable_int(u16 *variable_name, const efi_guid_t *vendor, @@ -505,49 +451,6 @@ efi_status_t __efi_runtime EFIAPI efi_query_variable_info_runtime( } /** - * efi_get_variable_runtime() - runtime implementation of GetVariable() - * - * @variable_name: name of the variable - * @vendor: vendor GUID - * @attributes: attributes of the variable - * @data_size: size of the buffer to which the variable value is copied - * @data: buffer to which the variable value is copied - * Return: status code - */ -static efi_status_t __efi_runtime EFIAPI -efi_get_variable_runtime(u16 *variable_name, const efi_guid_t *vendor, - u32 *attributes, efi_uintn_t *data_size, void *data) -{ - efi_status_t ret; - - ret = efi_get_variable_int(variable_name, vendor, attributes, - data_size, data, NULL); - - /* Remove EFI_VARIABLE_READ_ONLY flag */ - if (attributes) - *attributes &= EFI_VARIABLE_MASK; - - return ret; -} - -/** - * efi_get_next_variable_name_runtime() - runtime implementation of - * GetNextVariable() - * - * @variable_name_size: size of variable_name buffer in byte - * @variable_name: name of uefi variable's name in u16 - * @vendor: vendor's guid - * Return: status code - */ -static efi_status_t __efi_runtime EFIAPI -efi_get_next_variable_name_runtime(efi_uintn_t *variable_name_size, - u16 *variable_name, efi_guid_t *vendor) -{ - return efi_get_next_variable_name_int(variable_name_size, variable_name, - vendor); -} - -/** * efi_set_variable_runtime() - runtime implementation of SetVariable() * * @variable_name: name of the variable diff --git a/lib/efi_loader/efi_variable_tee.c b/lib/efi_loader/efi_variable_tee.c index 37fa5fef1d..be6f3dfad4 100644 --- a/lib/efi_loader/efi_variable_tee.c +++ b/lib/efi_loader/efi_variable_tee.c @@ -15,6 +15,8 @@ #include <malloc.h> #include <mm_communication.h> +#define OPTEE_PAGE_SIZE BIT(12) +extern struct efi_var_file __efi_runtime_data *efi_var_buf; static efi_uintn_t max_buffer_size; /* comm + var + func + data */ static efi_uintn_t max_payload_size; /* func + data */ @@ -237,8 +239,32 @@ efi_status_t EFIAPI get_max_payload(efi_uintn_t *size) if (ret != EFI_SUCCESS) goto out; + /* Make sure the buffer is big enough for storing variables */ + if (var_payload->size < MM_VARIABLE_ACCESS_HEADER_SIZE + 0x20) { + ret = EFI_DEVICE_ERROR; + goto out; + } *size = var_payload->size; - + /* + * Although the max payload is configurable on StMM, we only share a + * single page from OP-TEE for the non-secure buffer used to communicate + * with StMM. Since OP-TEE will reject to map anything bigger than that, + * make sure we are in bounds. + */ + if (*size > OPTEE_PAGE_SIZE) + *size = OPTEE_PAGE_SIZE - MM_COMMUNICATE_HEADER_SIZE - + MM_VARIABLE_COMMUNICATE_SIZE; + /* + * There seems to be a bug in EDK2 miscalculating the boundaries and + * size checks, so deduct 2 more bytes to fulfill this requirement. Fix + * it up here to ensure backwards compatibility with older versions + * (cf. StandaloneMmPkg/Drivers/StandaloneMmCpu/AArch64/EventHandle.c. + * sizeof (EFI_MM_COMMUNICATE_HEADER) instead the size minus the + * flexible array member). + * + * size is guaranteed to be > 2 due to checks on the beginning. + */ + *size -= 2; out: free(comm_buf); return ret; @@ -593,39 +619,6 @@ out: } /** - * efi_get_variable_runtime() - runtime implementation of GetVariable() - * - * @variable_name: name of the variable - * @guid: vendor GUID - * @attributes: attributes of the variable - * @data_size: size of the buffer to which the variable value is copied - * @data: buffer to which the variable value is copied - * Return: status code - */ -static efi_status_t __efi_runtime EFIAPI -efi_get_variable_runtime(u16 *variable_name, const efi_guid_t *guid, - u32 *attributes, efi_uintn_t *data_size, void *data) -{ - return EFI_UNSUPPORTED; -} - -/** - * efi_get_next_variable_name_runtime() - runtime implementation of - * GetNextVariable() - * - * @variable_name_size: size of variable_name buffer in byte - * @variable_name: name of uefi variable's name in u16 - * @guid: vendor's guid - * Return: status code - */ -static efi_status_t __efi_runtime EFIAPI -efi_get_next_variable_name_runtime(efi_uintn_t *variable_name_size, - u16 *variable_name, efi_guid_t *guid) -{ - return EFI_UNSUPPORTED; -} - -/** * efi_query_variable_info() - get information about EFI variables * * This function implements the QueryVariableInfo() runtime service. @@ -674,8 +667,10 @@ efi_set_variable_runtime(u16 *variable_name, const efi_guid_t *guid, */ void efi_variables_boot_exit_notify(void) { - u8 *comm_buf; efi_status_t ret; + u8 *comm_buf; + loff_t len; + struct efi_var_file *var_buf; comm_buf = setup_mm_hdr(NULL, 0, SMM_VARIABLE_FUNCTION_EXIT_BOOT_SERVICE, &ret); @@ -688,6 +683,18 @@ void efi_variables_boot_exit_notify(void) log_err("Unable to notify StMM for ExitBootServices\n"); free(comm_buf); + /* + * Populate the list for runtime variables. + * asking EFI_VARIABLE_RUNTIME_ACCESS is redundant, since + * efi_var_mem_notify_exit_boot_services will clean those, but that's fine + */ + ret = efi_var_collect(&var_buf, &len, EFI_VARIABLE_RUNTIME_ACCESS); + if (ret != EFI_SUCCESS) + log_err("Can't populate EFI variables. No runtime variables will be available\n"); + else + memcpy(efi_var_buf, var_buf, len); + free(var_buf); + /* Update runtime service table */ efi_runtime_services.query_variable_info = efi_query_variable_info_runtime; @@ -707,6 +714,11 @@ efi_status_t efi_init_variables(void) { efi_status_t ret; + /* Create a cached copy of the variables that will be enabled on ExitBootServices() */ + ret = efi_var_mem_init(); + if (ret != EFI_SUCCESS) + return ret; + ret = get_max_payload(&max_payload_size); if (ret != EFI_SUCCESS) return ret; |