| /* SPDX-License-Identifier: GPL-2.0-only */ |
| |
| #include <stdint.h> |
| #include <string.h> |
| #include <console/console.h> |
| |
| #include <vendorcode/intel/edk2/UDK2017/MdePkg/Include/Uefi/UefiBaseType.h> |
| #include <vendorcode/intel/edk2/UDK2017/MdePkg/Include/Uefi/UefiMultiPhase.h> |
| #include <vendorcode/intel/edk2/UDK2017/MdePkg/Include/Pi/PiFirmwareVolume.h> |
| #include <vendorcode/intel/edk2/UDK2017/MdeModulePkg/Include/Guid/VariableFormat.h> |
| |
| #include "efivars.h" |
| |
| #define PREFIX "EFIVARS: " |
| |
| static const EFI_GUID EfiVariableGuid = { |
| 0xddcf3616, 0x3275, 0x4164, { 0x98, 0xb6, 0xfe, 0x85, 0x70, 0x7f, 0xfe, 0x7d } }; |
| static const EFI_GUID EfiAuthenticatedVariableGuid = { |
| 0xaaf32c78, 0x947b, 0x439a, { 0xa1, 0x80, 0x2e, 0x14, 0x4e, 0xc3, 0x77, 0x92 } }; |
| static const EFI_GUID EfiSystemNvDataFvGuid = { |
| 0xfff12b8d, 0x7696, 0x4c8b, { 0xa9, 0x85, 0x27, 0x47, 0x07, 0x5b, 0x4f, 0x50 } }; |
| |
| static void print_guid(int log_level, const EFI_GUID *g) |
| { |
| printk(log_level, "GUID: %08x-%04x-%04x-%02x%02x%02x%02x%02x%02x%02x%02x", |
| g->Data1, g->Data2, g->Data3, g->Data4[0], g->Data4[1], g->Data4[2], |
| g->Data4[3], g->Data4[4], g->Data4[5], g->Data4[6], g->Data4[7]); |
| } |
| |
| static bool compare_guid(const EFI_GUID *a, const EFI_GUID *b) |
| { |
| return memcmp(a, b, sizeof(*a)) == 0; |
| } |
| |
| /* Reads the CHAR16 string from rdev at offset and prints it */ |
| static enum cb_err rdev_print_wchar(int log_level, struct region_device *rdev, size_t offset) |
| { |
| CHAR16 c; |
| int i = 0; |
| |
| /* Convert ASCII to UTF-16 */ |
| do { |
| if (rdev_readat(rdev, &c, offset + i * sizeof(c), sizeof(c)) != sizeof(c)) |
| return CB_EFI_ACCESS_ERROR; |
| if (c < 0x80) |
| printk(log_level, "%c", (char)c); |
| else |
| printk(log_level, "\\u%04x", c); |
| |
| i++; |
| } while (c); |
| return CB_SUCCESS; |
| } |
| |
| /* Convert an ASCII string to UTF-16 and write it to the rdev starting at offset. */ |
| static enum cb_err rdev_write_wchar(struct region_device *rdev, size_t offset, const char *msg) |
| { |
| size_t i; |
| CHAR16 c; |
| |
| /* Convert ASCII to UTF-16 */ |
| for (i = 0; i < strlen(msg) + 1; i++) { |
| c = msg[i]; |
| |
| if (rdev_writeat(rdev, &c, offset + i * sizeof(c), sizeof(c)) != sizeof(c)) |
| return CB_EFI_ACCESS_ERROR; |
| } |
| return CB_SUCCESS; |
| } |
| |
| /* Read an UTF-16 string from rdev at offset and compare it to ASCII string */ |
| static int rdev_strcmp_wchar_ascii(struct region_device *rdev, size_t offset, const char *msg) |
| { |
| size_t i; |
| CHAR16 c; |
| int r; |
| |
| i = 0; |
| /* Compare UTF-16 and ASCII */ |
| while (1) { |
| if (rdev_readat(rdev, &c, offset + i * sizeof(c), sizeof(c)) != sizeof(c)) |
| return CB_EFI_ACCESS_ERROR; |
| if ((r = (c - msg[i])) != 0 || !c) |
| break; |
| |
| i++; |
| } |
| return r; |
| } |
| |
| /* Compare an rdev region and a data buffer */ |
| static int rdev_memcmp(struct region_device *rdev, size_t offset, uint8_t *data, size_t size) |
| { |
| uint8_t buf[16]; |
| size_t i; |
| int r; |
| |
| i = 0; |
| while (size >= sizeof(buf)) { |
| if (rdev_readat(rdev, buf, offset + i, sizeof(buf)) != sizeof(buf)) |
| return CB_EFI_ACCESS_ERROR; |
| r = memcmp(buf, data + i, sizeof(buf)); |
| if (r != 0) |
| return r; |
| i += sizeof(buf); |
| size -= sizeof(buf); |
| } |
| while (size > 0) { |
| if (rdev_readat(rdev, buf, offset + i, 1) != 1) |
| return CB_EFI_ACCESS_ERROR; |
| r = buf[0] - data[i]; |
| if (r != 0) |
| return r; |
| i++; |
| size--; |
| } |
| return 0; |
| } |
| |
| |
| static enum cb_err validate_fv_header(const struct region_device *rdev, |
| EFI_FIRMWARE_VOLUME_HEADER *fw_vol_hdr) |
| { |
| uint16_t checksum, data; |
| size_t i; |
| |
| if (rdev_readat(rdev, fw_vol_hdr, 0, sizeof(*fw_vol_hdr)) != sizeof(*fw_vol_hdr)) |
| return CB_EFI_ACCESS_ERROR; |
| |
| /* |
| * Verify the header revision, header signature, length |
| * Length of FvBlock cannot be 2**64-1 |
| * HeaderLength cannot be an odd number |
| */ |
| if ((fw_vol_hdr->Revision != EFI_FVH_REVISION) |
| || (fw_vol_hdr->Signature != EFI_FVH_SIGNATURE) |
| || (fw_vol_hdr->FvLength > region_device_sz(rdev)) |
| || (fw_vol_hdr->HeaderLength > region_device_sz(rdev)) |
| || (fw_vol_hdr->HeaderLength & 1)) { |
| printk(BIOS_WARNING, PREFIX "No Firmware Volume header present\n"); |
| return CB_EFI_FVH_INVALID; |
| } |
| |
| /* Check the Firmware Volume Guid */ |
| if (!compare_guid(&fw_vol_hdr->FileSystemGuid, &EfiSystemNvDataFvGuid)) { |
| printk(BIOS_WARNING, PREFIX "Firmware Volume Guid non-compatible\n"); |
| return CB_EFI_FVH_INVALID; |
| } |
| |
| /* Verify the header checksum */ |
| checksum = 0; |
| for (i = 0; i < fw_vol_hdr->HeaderLength; i += 2) { |
| if (rdev_readat(rdev, &data, i, sizeof(data)) != sizeof(data)) |
| return CB_EFI_ACCESS_ERROR; |
| checksum = (uint16_t)(checksum + data); /* intentionally overflows */ |
| } |
| if (checksum != 0) { |
| printk(BIOS_WARNING, PREFIX "FV checksum is invalid: 0x%X\n", checksum); |
| return CB_EFI_CHECKSUM_INVALID; |
| } |
| |
| printk(BIOS_SPEW, PREFIX "UEFI FV with size %lld found\n", fw_vol_hdr->FvLength); |
| |
| return CB_SUCCESS; |
| } |
| |
| static enum cb_err |
| validate_variable_store_header(const EFI_FIRMWARE_VOLUME_HEADER *fv_hdr, |
| struct region_device *rdev, |
| bool *auth_format) |
| { |
| VARIABLE_STORE_HEADER hdr; |
| size_t length; |
| |
| if (rdev_readat(rdev, &hdr, fv_hdr->HeaderLength, sizeof(hdr)) != sizeof(hdr)) |
| return CB_EFI_ACCESS_ERROR; |
| |
| /* Check the Variable Store Guid */ |
| if (!compare_guid(&hdr.Signature, &EfiVariableGuid) && |
| !compare_guid(&hdr.Signature, &EfiAuthenticatedVariableGuid)) { |
| printk(BIOS_WARNING, PREFIX "Variable Store Guid non-compatible\n"); |
| return CB_EFI_VS_CORRUPTED_INVALID; |
| } |
| |
| *auth_format = compare_guid(&hdr.Signature, &EfiAuthenticatedVariableGuid); |
| |
| length = region_device_sz(rdev) - fv_hdr->HeaderLength; |
| if (hdr.Size > length) { |
| printk(BIOS_WARNING, PREFIX "Variable Store Length does not match\n"); |
| return CB_EFI_VS_CORRUPTED_INVALID; |
| } |
| |
| if (hdr.Format != VARIABLE_STORE_FORMATTED) |
| return CB_EFI_VS_NOT_FORMATTED_INVALID; |
| |
| if (hdr.State != VARIABLE_STORE_HEALTHY) |
| return CB_EFI_VS_CORRUPTED_INVALID; |
| |
| if (rdev_chain(rdev, rdev, fv_hdr->HeaderLength + sizeof(hdr), hdr.Size)) { |
| printk(BIOS_WARNING, PREFIX "rdev_chain failed\n"); |
| return CB_EFI_ACCESS_ERROR; |
| } |
| |
| printk(BIOS_SPEW, PREFIX "UEFI variable store with size %zu found\n", |
| region_device_sz(rdev)); |
| |
| return CB_SUCCESS; |
| } |
| |
| struct efi_find_args { |
| const EFI_GUID *guid; |
| const char *name; |
| uint32_t *size; |
| void *data; |
| }; |
| |
| static bool match(struct region_device *rdev, VARIABLE_HEADER *hdr, size_t hdr_size, |
| const char *name, const EFI_GUID *guid) |
| { |
| /* Only search for valid or in transition to be deleted variables */ |
| if ((hdr->State != VAR_ADDED) && |
| (hdr->State != (VAR_IN_DELETED_TRANSITION & VAR_ADDED))) |
| return false; |
| |
| if ((!compare_guid(&hdr->VendorGuid, guid)) || |
| !hdr->NameSize || |
| !hdr->DataSize) |
| return false; |
| |
| if (rdev_strcmp_wchar_ascii(rdev, hdr_size, name) != 0) |
| return false; |
| |
| return true; |
| } |
| |
| static |
| enum cb_err find_and_copy(struct region_device *rdev, VARIABLE_HEADER *hdr, size_t hdr_size, |
| void *arg, bool *stop) |
| { |
| struct efi_find_args *fa = (struct efi_find_args *)arg; |
| |
| if (!match(rdev, hdr, hdr_size, fa->name, fa->guid)) |
| return CB_SUCCESS; |
| |
| *stop = true; |
| if (*(fa->size) < hdr->DataSize) |
| return CB_EFI_BUFFER_TOO_SMALL; |
| |
| if (rdev_readat(rdev, fa->data, hdr_size + hdr->NameSize, hdr->DataSize) != |
| hdr->DataSize) |
| return CB_EFI_ACCESS_ERROR; |
| |
| *(fa->size) = hdr->DataSize; |
| return CB_SUCCESS; |
| } |
| |
| struct efi_find_compare_args { |
| const EFI_GUID *guid; |
| const char *name; |
| uint32_t size; |
| void *data; |
| bool match; |
| }; |
| |
| static |
| enum cb_err find_and_compare(struct region_device *rdev, VARIABLE_HEADER *hdr, size_t hdr_size, |
| void *arg, bool *stop) |
| { |
| struct efi_find_compare_args *fa = (struct efi_find_compare_args *)arg; |
| |
| if (!match(rdev, hdr, hdr_size, fa->name, fa->guid)) |
| return CB_SUCCESS; |
| |
| *stop = true; |
| if (fa->size != hdr->DataSize) { |
| fa->match = false; |
| return CB_SUCCESS; |
| } |
| |
| fa->match = rdev_memcmp(rdev, hdr_size + hdr->NameSize, fa->data, hdr->DataSize) == 0; |
| |
| return CB_SUCCESS; |
| } |
| |
| static enum cb_err noop(struct region_device *rdev, VARIABLE_HEADER *hdr, size_t hdr_size, |
| void *arg, bool *stop) |
| { |
| /* Does nothing. */ |
| return CB_SUCCESS; |
| } |
| |
| static enum cb_err print_var(struct region_device *rdev, VARIABLE_HEADER *hdr, size_t hdr_size, |
| void *arg, bool *stop) |
| { |
| uint8_t buf[16]; |
| size_t len, i; |
| |
| printk(BIOS_DEBUG, "%08zx: Var ", region_device_offset(rdev)); |
| print_guid(BIOS_DEBUG, &hdr->VendorGuid); |
| |
| printk(BIOS_DEBUG, "-"); |
| |
| rdev_print_wchar(BIOS_DEBUG, rdev, hdr_size); |
| |
| printk(BIOS_DEBUG, ", State %02x, Size %02x\n", hdr->State, hdr->DataSize); |
| |
| if (hdr->DataSize && hdr->NameSize) { |
| len = sizeof(buf) < hdr->DataSize ? sizeof(buf) : hdr->DataSize; |
| if (rdev_readat(rdev, buf, hdr_size + hdr->NameSize, len) != len) |
| return CB_EFI_ACCESS_ERROR; |
| printk(BIOS_DEBUG, " Data: "); |
| |
| for (i = 0; i < len; i++) |
| printk(BIOS_DEBUG, "0x%02x ", buf[i]); |
| |
| if (hdr->DataSize > len) |
| printk(BIOS_DEBUG, "..."); |
| |
| printk(BIOS_DEBUG, "\n"); |
| } |
| |
| return CB_SUCCESS; |
| } |
| |
| static enum cb_err walk_variables(struct region_device *rdev, |
| bool auth_format, |
| enum cb_err (*walker)(struct region_device *rdev, |
| VARIABLE_HEADER *hdr, |
| size_t hdr_size, |
| void *arg, |
| bool *stop), |
| void *walker_arg) |
| { |
| AUTHENTICATED_VARIABLE_HEADER auth_hdr; |
| size_t header_size, var_size; |
| VARIABLE_HEADER hdr; |
| bool stop; |
| enum cb_err ret; |
| |
| if (auth_format) |
| header_size = sizeof(AUTHENTICATED_VARIABLE_HEADER); |
| else |
| header_size = sizeof(VARIABLE_HEADER); |
| |
| do { |
| if (auth_format) { |
| if (rdev_readat(rdev, &auth_hdr, 0, sizeof(auth_hdr)) |
| != sizeof(auth_hdr)) |
| return CB_EFI_ACCESS_ERROR; |
| hdr.Reserved = auth_hdr.Reserved; |
| hdr.StartId = auth_hdr.StartId; |
| hdr.State = auth_hdr.State; |
| hdr.Attributes = auth_hdr.Attributes; |
| hdr.NameSize = auth_hdr.NameSize; |
| hdr.DataSize = auth_hdr.DataSize; |
| memcpy(&hdr.VendorGuid, &auth_hdr.VendorGuid, sizeof(hdr.VendorGuid)); |
| } else if (rdev_readat(rdev, &hdr, 0, sizeof(hdr)) != sizeof(hdr)) { |
| return CB_EFI_ACCESS_ERROR; |
| } |
| if (hdr.StartId != VARIABLE_DATA) |
| break; |
| |
| if (hdr.State == UINT8_MAX || |
| hdr.DataSize == UINT32_MAX || |
| hdr.NameSize == UINT32_MAX || |
| hdr.Attributes == UINT32_MAX) { |
| hdr.NameSize = 0; |
| hdr.DataSize = 0; |
| } |
| |
| printk(BIOS_SPEW, "Found variable with state %02x and ", hdr.State); |
| print_guid(BIOS_SPEW, &hdr.VendorGuid); |
| printk(BIOS_SPEW, "\n"); |
| |
| stop = false; |
| |
| ret = walker(rdev, &hdr, header_size, walker_arg, &stop); |
| |
| if (ret != CB_SUCCESS || stop) |
| return ret; |
| |
| var_size = ALIGN_UP(header_size + hdr.NameSize + hdr.DataSize, |
| HEADER_ALIGNMENT); |
| } while (!rdev_chain(rdev, rdev, var_size, region_device_sz(rdev) - var_size)); |
| |
| return CB_EFI_OPTION_NOT_FOUND; |
| } |
| |
| static enum cb_err efi_fv_init(struct region_device *rdev, bool *auth_format) |
| { |
| EFI_FIRMWARE_VOLUME_HEADER fv_hdr; |
| enum cb_err ret; |
| |
| ret = validate_fv_header(rdev, &fv_hdr); |
| if (ret != CB_SUCCESS) { |
| printk(BIOS_WARNING, PREFIX "Failed to validate firmware header\n"); |
| |
| return ret; |
| } |
| ret = validate_variable_store_header(&fv_hdr, rdev, auth_format); |
| if (ret != CB_SUCCESS) |
| printk(BIOS_WARNING, PREFIX "Failed to validate variable store header\n"); |
| |
| return ret; |
| } |
| |
| enum cb_err efi_fv_print_options(struct region_device *rdev) |
| { |
| enum cb_err ret; |
| bool auth_format; |
| |
| ret = efi_fv_init(rdev, &auth_format); |
| if (ret != CB_SUCCESS) |
| return ret; |
| |
| return walk_variables(rdev, auth_format, print_var, NULL); |
| } |
| |
| /* |
| * efi_fv_get_option |
| * - writes up to *size bytes into a buffer pointed to by *dest |
| * - rdev is the spi flash region to operate on |
| * - the FVH and variable store header must have been initialized by a third party |
| */ |
| enum cb_err efi_fv_get_option(struct region_device *rdev, |
| const EFI_GUID *guid, |
| const char *name, |
| void *dest, |
| uint32_t *size) |
| { |
| struct efi_find_args args; |
| bool auth_format; |
| enum cb_err ret; |
| |
| ret = efi_fv_init(rdev, &auth_format); |
| if (ret != CB_SUCCESS) |
| return ret; |
| |
| args.guid = guid; |
| args.name = name; |
| args.size = size; |
| args.data = dest; |
| |
| return walk_variables(rdev, auth_format, find_and_copy, &args); |
| } |
| |
| static enum cb_err write_auth_hdr(struct region_device *rdev, const EFI_GUID *guid, |
| const char *name, void *data, size_t size) |
| { |
| AUTHENTICATED_VARIABLE_HEADER auth_hdr; |
| size_t name_size, var_size; |
| enum cb_err ret; |
| |
| name_size = (strlen(name) + 1) * sizeof(CHAR16); |
| var_size = name_size + size + sizeof(auth_hdr); |
| |
| if (var_size > region_device_sz(rdev)) |
| return CB_EFI_STORE_FULL; |
| |
| /* Sanity check. flash must be blank */ |
| if (rdev_readat(rdev, &auth_hdr, 0, sizeof(auth_hdr)) != sizeof(auth_hdr)) |
| return CB_EFI_ACCESS_ERROR; |
| |
| if (auth_hdr.StartId != UINT16_MAX || |
| auth_hdr.State != UINT8_MAX || |
| auth_hdr.DataSize != UINT32_MAX || |
| auth_hdr.NameSize != UINT32_MAX || |
| auth_hdr.Attributes != UINT32_MAX) { |
| return CB_EFI_ACCESS_ERROR; |
| } |
| |
| memset(&auth_hdr, 0xff, sizeof(auth_hdr)); |
| |
| auth_hdr.StartId = VARIABLE_DATA; |
| auth_hdr.Attributes = EFI_VARIABLE_NON_VOLATILE| |
| EFI_VARIABLE_BOOTSERVICE_ACCESS| |
| EFI_VARIABLE_RUNTIME_ACCESS; |
| auth_hdr.NameSize = name_size; |
| auth_hdr.DataSize = size; |
| memcpy(&auth_hdr.VendorGuid, guid, sizeof(EFI_GUID)); |
| |
| /* Write header with no State */ |
| if (rdev_writeat(rdev, &auth_hdr, 0, sizeof(auth_hdr)) != sizeof(auth_hdr)) |
| return CB_EFI_ACCESS_ERROR; |
| |
| /* Set header State to valid header */ |
| auth_hdr.State = VAR_HEADER_VALID_ONLY; |
| if (rdev_writeat(rdev, &auth_hdr.State, offsetof(AUTHENTICATED_VARIABLE_HEADER, State), |
| sizeof(auth_hdr.State)) != sizeof(auth_hdr.State)) |
| return CB_EFI_ACCESS_ERROR; |
| |
| /* Write the name */ |
| ret = rdev_write_wchar(rdev, sizeof(auth_hdr), name); |
| if (ret != CB_SUCCESS) |
| return ret; |
| |
| /* Write the data */ |
| if (rdev_writeat(rdev, data, sizeof(auth_hdr) + name_size, size) != size) |
| return CB_EFI_ACCESS_ERROR; |
| |
| /* Set header State to valid data */ |
| auth_hdr.State = VAR_ADDED; |
| if (rdev_writeat(rdev, &auth_hdr.State, offsetof(AUTHENTICATED_VARIABLE_HEADER, State), |
| sizeof(auth_hdr.State)) != sizeof(auth_hdr.State)) |
| return CB_EFI_ACCESS_ERROR; |
| |
| return CB_SUCCESS; |
| } |
| |
| static enum cb_err write_hdr(struct region_device *rdev, const EFI_GUID *guid, |
| const char *name, |
| void *data, |
| size_t size) |
| { |
| VARIABLE_HEADER hdr; |
| size_t name_size, var_size; |
| enum cb_err ret; |
| |
| name_size = (strlen(name) + 1) * sizeof(CHAR16); |
| var_size = name_size + size + sizeof(hdr); |
| if (var_size > region_device_sz(rdev)) |
| return CB_EFI_STORE_FULL; |
| |
| /* Sanity check. flash must be blank */ |
| if (rdev_readat(rdev, &hdr, 0, sizeof(hdr)) != sizeof(hdr)) |
| return CB_EFI_ACCESS_ERROR; |
| |
| if (hdr.StartId != UINT16_MAX || |
| hdr.State != UINT8_MAX || |
| hdr.DataSize != UINT32_MAX || |
| hdr.NameSize != UINT32_MAX || |
| hdr.Attributes != UINT32_MAX) { |
| return CB_EFI_ACCESS_ERROR; |
| } |
| |
| memset(&hdr, 0xff, sizeof(hdr)); |
| |
| hdr.StartId = VARIABLE_DATA; |
| hdr.Attributes = EFI_VARIABLE_NON_VOLATILE| |
| EFI_VARIABLE_BOOTSERVICE_ACCESS| |
| EFI_VARIABLE_RUNTIME_ACCESS; |
| hdr.NameSize = name_size; |
| hdr.DataSize = size; |
| memcpy(&hdr.VendorGuid, guid, sizeof(EFI_GUID)); |
| |
| /* Write header with no State */ |
| if (rdev_writeat(rdev, &hdr, 0, sizeof(hdr)) != sizeof(hdr)) |
| return CB_EFI_ACCESS_ERROR; |
| |
| /* Set header State to valid header */ |
| hdr.State = VAR_HEADER_VALID_ONLY; |
| if (rdev_writeat(rdev, &hdr.State, offsetof(VARIABLE_HEADER, State), |
| sizeof(hdr.State)) != sizeof(hdr.State)) |
| return CB_EFI_ACCESS_ERROR; |
| |
| /* Write the name */ |
| ret = rdev_write_wchar(rdev, sizeof(hdr), name); |
| if (ret != CB_SUCCESS) |
| return ret; |
| |
| /* Write the data */ |
| if (rdev_writeat(rdev, data, sizeof(hdr) + name_size, size) != size) |
| return CB_EFI_ACCESS_ERROR; |
| |
| /* Set header State to valid data */ |
| hdr.State = VAR_ADDED; |
| if (rdev_writeat(rdev, &hdr.State, offsetof(VARIABLE_HEADER, State), |
| sizeof(hdr.State)) != sizeof(hdr.State)) |
| return CB_EFI_ACCESS_ERROR; |
| |
| return CB_SUCCESS; |
| } |
| |
| /* |
| * efi_fv_set_option |
| * - writes size bytes read from the buffer pointed to by *data |
| * - rdev is the spi flash region to operate on |
| * - the FVH and variable store header must have been initialized by a third party |
| */ |
| enum cb_err efi_fv_set_option(struct region_device *rdev, |
| const EFI_GUID *guid, |
| const char *name, |
| void *data, |
| uint32_t size) |
| { |
| struct region_device rdev_old; |
| struct efi_find_compare_args args; |
| bool found_existing; |
| VARIABLE_HEADER hdr; |
| bool auth_format; |
| enum cb_err ret; |
| |
| ret = efi_fv_init(rdev, &auth_format); |
| if (ret != CB_SUCCESS) |
| return ret; |
| |
| /* Find existing variable */ |
| args.guid = guid; |
| args.name = name; |
| args.size = size; |
| args.match = false; |
| args.data = data; |
| |
| ret = walk_variables(rdev, auth_format, find_and_compare, &args); |
| found_existing = ret == CB_SUCCESS; |
| |
| if (found_existing) { |
| printk(BIOS_ERR, "found existing variable %s, match =%d\n", name, args.match); |
| |
| if (args.match) |
| return CB_SUCCESS; |
| |
| rdev_old = *rdev; |
| |
| /* Mark as to be deleted */ |
| hdr.State = VAR_IN_DELETED_TRANSITION; |
| if (rdev_writeat(rdev, &hdr.State, offsetof(VARIABLE_HEADER, State), |
| sizeof(hdr.State)) != sizeof(hdr.State)) |
| return CB_EFI_ACCESS_ERROR; |
| } |
| |
| /* Walk to end of variable store */ |
| ret = walk_variables(rdev, auth_format, noop, NULL); |
| if (ret != CB_EFI_OPTION_NOT_FOUND) |
| return ret; |
| |
| /* Now append new variable: |
| * 1. Write the header without State field. |
| * 2. Write the State field and set it to HEADER_VALID. |
| * 3. Write data |
| * 4. Write the State field and set it to VAR_ADDED |
| */ |
| |
| if (auth_format) |
| ret = write_auth_hdr(rdev, guid, name, data, size); |
| else |
| ret = write_hdr(rdev, guid, name, data, size); |
| if (ret != CB_SUCCESS) |
| return ret; |
| |
| if (found_existing) { |
| /* Mark old variable as deleted */ |
| hdr.State = VAR_DELETED; |
| if (rdev_writeat(&rdev_old, &hdr.State, offsetof(VARIABLE_HEADER, State), |
| sizeof(hdr.State)) != sizeof(hdr.State)) |
| return CB_EFI_ACCESS_ERROR; |
| } |
| |
| return CB_SUCCESS; |
| } |