mirror of
https://github.com/u-boot/u-boot.git
synced 2025-05-08 19:11:53 +00:00
efi_loader: use memory based variable storage
Saving UEFI variable as encoded U-Boot environment variables does not allow implement run-time support. Use a memory buffer for storing UEFI variables. Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
This commit is contained in:
Heinrich Schuchardt
parent
f1f990a8c9
commit
ab7296c99c
1 changed files with 93 additions and 467 deletions
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@ -30,145 +30,6 @@ static bool efi_secure_boot;
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static enum efi_secure_mode efi_secure_mode;
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static u8 efi_vendor_keys;
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/*
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* Mapping between EFI variables and u-boot variables:
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*
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* efi_$guid_$varname = {attributes}(type)value
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*
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* For example:
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*
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* efi_8be4df61-93ca-11d2-aa0d-00e098032b8c_OsIndicationsSupported=
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* "{ro,boot,run}(blob)0000000000000000"
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* efi_8be4df61-93ca-11d2-aa0d-00e098032b8c_BootOrder=
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* "(blob)00010000"
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*
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* The attributes are a comma separated list of these possible
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* attributes:
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*
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* + ro - read-only
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* + boot - boot-services access
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* + run - runtime access
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*
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* NOTE: with current implementation, no variables are available after
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* ExitBootServices, and all are persisted (if possible).
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*
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* If not specified, the attributes default to "{boot}".
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*
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* The required type is one of:
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*
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* + utf8 - raw utf8 string
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* + blob - arbitrary length hex string
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*
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* Maybe a utf16 type would be useful to for a string value to be auto
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* converted to utf16?
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*/
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#define PREFIX_LEN (strlen("efi_xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx_"))
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/**
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* efi_to_native() - convert the UEFI variable name and vendor GUID to U-Boot
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* variable name
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*
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* The U-Boot variable name is a concatenation of prefix 'efi', the hexstring
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* encoded vendor GUID, and the UTF-8 encoded UEFI variable name separated by
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* underscores, e.g. 'efi_8be4df61-93ca-11d2-aa0d-00e098032b8c_BootOrder'.
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*
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* @native: pointer to pointer to U-Boot variable name
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* @variable_name: UEFI variable name
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* @vendor: vendor GUID
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* Return: status code
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*/
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static efi_status_t efi_to_native(char **native, const u16 *variable_name,
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const efi_guid_t *vendor)
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{
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size_t len;
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char *pos;
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len = PREFIX_LEN + utf16_utf8_strlen(variable_name) + 1;
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*native = malloc(len);
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if (!*native)
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return EFI_OUT_OF_RESOURCES;
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pos = *native;
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pos += sprintf(pos, "efi_%pUl_", vendor);
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utf16_utf8_strcpy(&pos, variable_name);
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return EFI_SUCCESS;
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}
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/**
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* prefix() - skip over prefix
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*
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* Skip over a prefix string.
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*
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* @str: string with prefix
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* @prefix: prefix string
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* Return: string without prefix, or NULL if prefix not found
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*/
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static const char *prefix(const char *str, const char *prefix)
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{
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size_t n = strlen(prefix);
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if (!strncmp(prefix, str, n))
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return str + n;
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return NULL;
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}
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/**
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* parse_attr() - decode attributes part of variable value
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*
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* Convert the string encoded attributes of a UEFI variable to a bit mask.
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* TODO: Several attributes are not supported.
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*
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* @str: value of U-Boot variable
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* @attrp: pointer to UEFI attributes
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* @timep: pointer to time attribute
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* Return: pointer to remainder of U-Boot variable value
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*/
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static const char *parse_attr(const char *str, u32 *attrp, u64 *timep)
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{
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u32 attr = 0;
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char sep = '{';
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if (*str != '{') {
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*attrp = EFI_VARIABLE_BOOTSERVICE_ACCESS;
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return str;
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}
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while (*str == sep) {
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const char *s;
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str++;
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if ((s = prefix(str, "ro"))) {
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attr |= EFI_VARIABLE_READ_ONLY;
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} else if ((s = prefix(str, "nv"))) {
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attr |= EFI_VARIABLE_NON_VOLATILE;
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} else if ((s = prefix(str, "boot"))) {
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attr |= EFI_VARIABLE_BOOTSERVICE_ACCESS;
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} else if ((s = prefix(str, "run"))) {
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attr |= EFI_VARIABLE_RUNTIME_ACCESS;
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} else if ((s = prefix(str, "time="))) {
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attr |= EFI_VARIABLE_TIME_BASED_AUTHENTICATED_WRITE_ACCESS;
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hex2bin((u8 *)timep, s, sizeof(*timep));
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s += sizeof(*timep) * 2;
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} else if (*str == '}') {
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break;
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} else {
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printf("invalid attribute: %s\n", str);
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break;
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}
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str = s;
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sep = ',';
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}
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str++;
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*attrp = attr;
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return str;
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}
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/**
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* efi_set_secure_state - modify secure boot state variables
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* @secure_boot: value of SecureBoot
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@ -568,296 +429,115 @@ static efi_status_t efi_variable_authenticate(u16 *variable,
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}
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#endif /* CONFIG_EFI_SECURE_BOOT */
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efi_status_t efi_get_variable_int(u16 *variable_name, const efi_guid_t *vendor,
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u32 *attributes, efi_uintn_t *data_size,
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void *data, u64 *timep)
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efi_status_t __efi_runtime
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efi_get_variable_int(u16 *variable_name, const efi_guid_t *vendor,
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u32 *attributes, efi_uintn_t *data_size, void *data,
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u64 *timep)
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{
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char *native_name;
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efi_status_t ret;
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unsigned long in_size;
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const char *val = NULL, *s;
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u64 time = 0;
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u32 attr;
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efi_uintn_t old_size;
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struct efi_var_entry *var;
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u16 *pdata;
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if (!variable_name || !vendor || !data_size)
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return EFI_INVALID_PARAMETER;
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ret = efi_to_native(&native_name, variable_name, vendor);
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if (ret)
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return ret;
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EFI_PRINT("get '%s'\n", native_name);
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val = env_get(native_name);
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free(native_name);
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if (!val)
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var = efi_var_mem_find(vendor, variable_name, NULL);
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if (!var)
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return EFI_NOT_FOUND;
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val = parse_attr(val, &attr, &time);
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if (timep)
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*timep = time;
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in_size = *data_size;
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if ((s = prefix(val, "(blob)"))) {
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size_t len = strlen(s);
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/* number of hexadecimal digits must be even */
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if (len & 1)
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return EFI_DEVICE_ERROR;
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/* two characters per byte: */
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len /= 2;
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*data_size = len;
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if (in_size < len) {
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ret = EFI_BUFFER_TOO_SMALL;
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goto out;
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}
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if (!data) {
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EFI_PRINT("Variable with no data shouldn't exist.\n");
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return EFI_INVALID_PARAMETER;
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}
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if (hex2bin(data, s, len))
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return EFI_DEVICE_ERROR;
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EFI_PRINT("got value: \"%s\"\n", s);
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} else if ((s = prefix(val, "(utf8)"))) {
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unsigned len = strlen(s) + 1;
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*data_size = len;
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if (in_size < len) {
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ret = EFI_BUFFER_TOO_SMALL;
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goto out;
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}
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if (!data) {
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EFI_PRINT("Variable with no data shouldn't exist.\n");
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return EFI_INVALID_PARAMETER;
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}
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memcpy(data, s, len);
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((char *)data)[len] = '\0';
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EFI_PRINT("got value: \"%s\"\n", (char *)data);
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} else {
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EFI_PRINT("invalid value: '%s'\n", val);
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return EFI_DEVICE_ERROR;
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}
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out:
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if (attributes)
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*attributes = attr;
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*attributes = var->attr;
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if (timep)
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*timep = var->time;
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return ret;
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}
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static char *efi_variables_list;
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static char *efi_cur_variable;
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/**
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* parse_uboot_variable() - parse a u-boot variable and get uefi-related
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* information
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* @variable: whole data of u-boot variable (ie. name=value)
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* @variable_name_size: size of variable_name buffer in byte
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* @variable_name: name of uefi variable in u16, null-terminated
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* @vendor: vendor's guid
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* @attributes: attributes
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*
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* A uefi variable is encoded into a u-boot variable as described above.
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* This function parses such a u-boot variable and retrieve uefi-related
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* information into respective parameters. In return, variable_name_size
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* is the size of variable name including NULL.
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*
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* Return: EFI_SUCCESS if parsing is OK, EFI_NOT_FOUND when
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* the entire variable list has been returned,
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* otherwise non-zero status code
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*/
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static efi_status_t parse_uboot_variable(char *variable,
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efi_uintn_t *variable_name_size,
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u16 *variable_name,
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const efi_guid_t *vendor,
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u32 *attributes)
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{
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char *guid, *name, *end, c;
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size_t name_len;
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efi_uintn_t old_variable_name_size;
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u64 time;
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u16 *p;
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guid = strchr(variable, '_');
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if (!guid)
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return EFI_INVALID_PARAMETER;
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guid++;
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name = strchr(guid, '_');
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if (!name)
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return EFI_INVALID_PARAMETER;
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name++;
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end = strchr(name, '=');
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if (!end)
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return EFI_INVALID_PARAMETER;
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name_len = end - name;
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old_variable_name_size = *variable_name_size;
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*variable_name_size = sizeof(u16) * (name_len + 1);
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if (old_variable_name_size < *variable_name_size)
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old_size = *data_size;
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*data_size = var->length;
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if (old_size < var->length)
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return EFI_BUFFER_TOO_SMALL;
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end++; /* point to value */
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/* variable name */
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p = variable_name;
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utf8_utf16_strncpy(&p, name, name_len);
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variable_name[name_len] = 0;
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/* guid */
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c = *(name - 1);
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*(name - 1) = '\0'; /* guid need be null-terminated here */
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if (uuid_str_to_bin(guid, (unsigned char *)vendor,
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UUID_STR_FORMAT_GUID))
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/* The only error would be EINVAL. */
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if (!data)
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return EFI_INVALID_PARAMETER;
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*(name - 1) = c;
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/* attributes */
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parse_attr(end, attributes, &time);
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for (pdata = var->name; *pdata; ++pdata)
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;
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++pdata;
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efi_memcpy_runtime(data, pdata, var->length);
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return EFI_SUCCESS;
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}
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efi_status_t efi_get_next_variable_name_int(efi_uintn_t *variable_name_size,
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u16 *variable_name,
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efi_guid_t *vendor)
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efi_status_t __efi_runtime
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efi_get_next_variable_name_int(efi_uintn_t *variable_name_size,
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u16 *variable_name, efi_guid_t *vendor)
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{
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char *native_name, *variable;
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ssize_t name_len, list_len;
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char regex[256];
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char * const regexlist[] = {regex};
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u32 attributes;
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int i;
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efi_status_t ret;
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struct efi_var_entry *var;
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efi_uintn_t old_size;
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u16 *pdata;
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if (!variable_name_size || !variable_name || !vendor)
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return EFI_INVALID_PARAMETER;
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if (variable_name[0]) {
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/* check null-terminated string */
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for (i = 0; i < *variable_name_size; i++)
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if (!variable_name[i])
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break;
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if (i >= *variable_name_size)
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return EFI_INVALID_PARAMETER;
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efi_var_mem_find(vendor, variable_name, &var);
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/* search for the last-returned variable */
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ret = efi_to_native(&native_name, variable_name, vendor);
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if (ret)
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return ret;
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if (!var)
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return EFI_NOT_FOUND;
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name_len = strlen(native_name);
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for (variable = efi_variables_list; variable && *variable;) {
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if (!strncmp(variable, native_name, name_len) &&
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variable[name_len] == '=')
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break;
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for (pdata = var->name; *pdata; ++pdata)
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;
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++pdata;
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variable = strchr(variable, '\n');
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if (variable)
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variable++;
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}
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old_size = *variable_name_size;
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*variable_name_size = (uintptr_t)pdata - (uintptr_t)var->name;
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free(native_name);
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if (!(variable && *variable))
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return EFI_INVALID_PARAMETER;
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if (old_size < *variable_name_size)
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return EFI_BUFFER_TOO_SMALL;
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/* next variable */
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variable = strchr(variable, '\n');
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if (variable)
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variable++;
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if (!(variable && *variable))
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return EFI_NOT_FOUND;
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} else {
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/*
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*new search: free a list used in the previous search
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*/
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free(efi_variables_list);
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efi_variables_list = NULL;
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efi_cur_variable = NULL;
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efi_memcpy_runtime(variable_name, var->name, *variable_name_size);
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efi_memcpy_runtime(vendor, &var->guid, sizeof(efi_guid_t));
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snprintf(regex, 256, "efi_.*-.*-.*-.*-.*_.*");
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list_len = hexport_r(&env_htab, '\n',
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H_MATCH_REGEX | H_MATCH_KEY,
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&efi_variables_list, 0, 1, regexlist);
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if (list_len <= 1)
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return EFI_NOT_FOUND;
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variable = efi_variables_list;
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}
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ret = parse_uboot_variable(variable, variable_name_size, variable_name,
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vendor, &attributes);
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return ret;
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return EFI_SUCCESS;
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}
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efi_status_t efi_set_variable_int(u16 *variable_name, const efi_guid_t *vendor,
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u32 attributes, efi_uintn_t data_size,
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const void *data, bool ro_check)
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{
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char *native_name = NULL, *old_data = NULL, *val = NULL, *s;
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efi_uintn_t old_size;
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struct efi_var_entry *var;
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efi_uintn_t ret;
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bool append, delete;
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u64 time = 0;
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u32 old_attr;
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efi_status_t ret = EFI_SUCCESS;
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if (!variable_name || !*variable_name || !vendor ||
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((attributes & EFI_VARIABLE_RUNTIME_ACCESS) &&
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!(attributes & EFI_VARIABLE_BOOTSERVICE_ACCESS))) {
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ret = EFI_INVALID_PARAMETER;
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goto err;
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}
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ret = efi_to_native(&native_name, variable_name, vendor);
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if (ret)
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goto err;
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!(attributes & EFI_VARIABLE_BOOTSERVICE_ACCESS)))
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return EFI_INVALID_PARAMETER;
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/* check if a variable exists */
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old_size = 0;
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old_attr = 0;
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ret = efi_get_variable_int(variable_name, vendor, &old_attr,
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&old_size, NULL, &time);
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var = efi_var_mem_find(vendor, variable_name, NULL);
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append = !!(attributes & EFI_VARIABLE_APPEND_WRITE);
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attributes &= ~(u32)EFI_VARIABLE_APPEND_WRITE;
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delete = !append && (!data_size || !attributes);
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/* check attributes */
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if (old_size) {
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if (ro_check && (old_attr & EFI_VARIABLE_READ_ONLY)) {
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ret = EFI_WRITE_PROTECTED;
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goto err;
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}
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if (var) {
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if (ro_check && (var->attr & EFI_VARIABLE_READ_ONLY))
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return EFI_WRITE_PROTECTED;
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/* attributes won't be changed */
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if (!delete &&
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((ro_check && old_attr != attributes) ||
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(!ro_check && ((old_attr & ~(u32)EFI_VARIABLE_READ_ONLY)
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((ro_check && var->attr != attributes) ||
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(!ro_check && ((var->attr & ~(u32)EFI_VARIABLE_READ_ONLY)
|
||||
!= (attributes & ~(u32)EFI_VARIABLE_READ_ONLY))))) {
|
||||
ret = EFI_INVALID_PARAMETER;
|
||||
goto err;
|
||||
return EFI_INVALID_PARAMETER;
|
||||
}
|
||||
time = var->time;
|
||||
} else {
|
||||
if (delete || append) {
|
||||
if (delete || append)
|
||||
/*
|
||||
* Trying to delete or to update a non-existent
|
||||
* variable.
|
||||
*/
|
||||
ret = EFI_NOT_FOUND;
|
||||
goto err;
|
||||
}
|
||||
return EFI_NOT_FOUND;
|
||||
}
|
||||
|
||||
if (((!u16_strcmp(variable_name, L"PK") ||
|
||||
|
|
@ -869,27 +549,26 @@ efi_status_t efi_set_variable_int(u16 *variable_name, const efi_guid_t *vendor,
|
|||
/* authentication is mandatory */
|
||||
if (!(attributes &
|
||||
EFI_VARIABLE_TIME_BASED_AUTHENTICATED_WRITE_ACCESS)) {
|
||||
EFI_PRINT("%ls: AUTHENTICATED_WRITE_ACCESS required\n",
|
||||
EFI_PRINT("%ls: TIME_BASED_AUTHENTICATED_WRITE_ACCESS required\n",
|
||||
variable_name);
|
||||
ret = EFI_INVALID_PARAMETER;
|
||||
goto err;
|
||||
return EFI_INVALID_PARAMETER;
|
||||
}
|
||||
}
|
||||
|
||||
/* authenticate a variable */
|
||||
if (IS_ENABLED(CONFIG_EFI_SECURE_BOOT)) {
|
||||
if (attributes & EFI_VARIABLE_AUTHENTICATED_WRITE_ACCESS) {
|
||||
ret = EFI_INVALID_PARAMETER;
|
||||
goto err;
|
||||
}
|
||||
if (attributes & EFI_VARIABLE_AUTHENTICATED_WRITE_ACCESS)
|
||||
return EFI_INVALID_PARAMETER;
|
||||
if (attributes &
|
||||
EFI_VARIABLE_TIME_BASED_AUTHENTICATED_WRITE_ACCESS) {
|
||||
u32 env_attr;
|
||||
|
||||
ret = efi_variable_authenticate(variable_name, vendor,
|
||||
&data_size, &data,
|
||||
attributes, &old_attr,
|
||||
attributes, &env_attr,
|
||||
&time);
|
||||
if (ret != EFI_SUCCESS)
|
||||
goto err;
|
||||
return ret;
|
||||
|
||||
/* last chance to check for delete */
|
||||
if (!data_size)
|
||||
|
|
@ -900,105 +579,42 @@ efi_status_t efi_set_variable_int(u16 *variable_name, const efi_guid_t *vendor,
|
|||
(EFI_VARIABLE_AUTHENTICATED_WRITE_ACCESS |
|
||||
EFI_VARIABLE_TIME_BASED_AUTHENTICATED_WRITE_ACCESS)) {
|
||||
EFI_PRINT("Secure boot is not configured\n");
|
||||
ret = EFI_INVALID_PARAMETER;
|
||||
goto err;
|
||||
return EFI_INVALID_PARAMETER;
|
||||
}
|
||||
}
|
||||
|
||||
/* delete a variable */
|
||||
if (delete) {
|
||||
/* !old_size case has been handled before */
|
||||
val = NULL;
|
||||
/* EFI_NOT_FOUND has been handled before */
|
||||
ret = EFI_SUCCESS;
|
||||
goto out;
|
||||
}
|
||||
} else if (append) {
|
||||
u16 *old_data = var->name;
|
||||
|
||||
if (append) {
|
||||
old_data = malloc(old_size);
|
||||
if (!old_data) {
|
||||
ret = EFI_OUT_OF_RESOURCES;
|
||||
goto err;
|
||||
}
|
||||
ret = efi_get_variable_int(variable_name, vendor,
|
||||
&old_attr, &old_size, old_data, NULL);
|
||||
if (ret != EFI_SUCCESS)
|
||||
goto err;
|
||||
for (; *old_data; ++old_data)
|
||||
;
|
||||
++old_data;
|
||||
ret = efi_var_mem_ins(variable_name, vendor, attributes,
|
||||
var->length, old_data, data_size, data,
|
||||
time);
|
||||
} else {
|
||||
old_size = 0;
|
||||
ret = efi_var_mem_ins(variable_name, vendor, attributes,
|
||||
data_size, data, 0, NULL, time);
|
||||
}
|
||||
efi_var_mem_del(var);
|
||||
|
||||
val = malloc(2 * old_size + 2 * data_size
|
||||
+ strlen("{ro,run,boot,nv,time=0123456701234567}(blob)")
|
||||
+ 1);
|
||||
if (!val) {
|
||||
ret = EFI_OUT_OF_RESOURCES;
|
||||
goto err;
|
||||
}
|
||||
if (ret != EFI_SUCCESS)
|
||||
return ret;
|
||||
|
||||
s = val;
|
||||
|
||||
/*
|
||||
* store attributes
|
||||
*/
|
||||
attributes &= (EFI_VARIABLE_READ_ONLY |
|
||||
EFI_VARIABLE_NON_VOLATILE |
|
||||
EFI_VARIABLE_BOOTSERVICE_ACCESS |
|
||||
EFI_VARIABLE_RUNTIME_ACCESS |
|
||||
EFI_VARIABLE_TIME_BASED_AUTHENTICATED_WRITE_ACCESS);
|
||||
s += sprintf(s, "{");
|
||||
for (u32 attr_rem = attributes; attr_rem;) {
|
||||
u32 attr = 1 << (ffs(attr_rem) - 1);
|
||||
|
||||
if (attr == EFI_VARIABLE_READ_ONLY) {
|
||||
s += sprintf(s, "ro");
|
||||
} else if (attr == EFI_VARIABLE_NON_VOLATILE) {
|
||||
s += sprintf(s, "nv");
|
||||
} else if (attr == EFI_VARIABLE_BOOTSERVICE_ACCESS) {
|
||||
s += sprintf(s, "boot");
|
||||
} else if (attr == EFI_VARIABLE_RUNTIME_ACCESS) {
|
||||
s += sprintf(s, "run");
|
||||
} else if (attr ==
|
||||
EFI_VARIABLE_TIME_BASED_AUTHENTICATED_WRITE_ACCESS) {
|
||||
s += sprintf(s, "time=");
|
||||
s = bin2hex(s, (u8 *)&time, sizeof(time));
|
||||
}
|
||||
|
||||
attr_rem &= ~attr;
|
||||
if (attr_rem)
|
||||
s += sprintf(s, ",");
|
||||
}
|
||||
s += sprintf(s, "}");
|
||||
s += sprintf(s, "(blob)");
|
||||
|
||||
/* store payload: */
|
||||
if (append)
|
||||
s = bin2hex(s, old_data, old_size);
|
||||
s = bin2hex(s, data, data_size);
|
||||
*s = '\0';
|
||||
|
||||
EFI_PRINT("setting: %s=%s\n", native_name, val);
|
||||
|
||||
out:
|
||||
if (env_set(native_name, val)) {
|
||||
ret = EFI_DEVICE_ERROR;
|
||||
} else {
|
||||
if (!u16_strcmp(variable_name, L"PK"))
|
||||
ret = efi_init_secure_state();
|
||||
else
|
||||
ret = EFI_SUCCESS;
|
||||
}
|
||||
if (!u16_strcmp(variable_name, L"PK"))
|
||||
ret = efi_init_secure_state();
|
||||
else
|
||||
ret = EFI_SUCCESS;
|
||||
|
||||
/* Write non-volatile EFI variables to file */
|
||||
if (attributes & EFI_VARIABLE_NON_VOLATILE &&
|
||||
ret == EFI_SUCCESS && efi_obj_list_initialized == EFI_SUCCESS)
|
||||
efi_var_to_file();
|
||||
|
||||
err:
|
||||
free(native_name);
|
||||
free(old_data);
|
||||
free(val);
|
||||
|
||||
return ret;
|
||||
return EFI_SUCCESS;
|
||||
}
|
||||
|
||||
efi_status_t efi_query_variable_info_int(u32 attributes,
|
||||
|
|
@ -1006,7 +622,13 @@ efi_status_t efi_query_variable_info_int(u32 attributes,
|
|||
u64 *remaining_variable_storage_size,
|
||||
u64 *maximum_variable_size)
|
||||
{
|
||||
return EFI_UNSUPPORTED;
|
||||
*maximum_variable_storage_size = EFI_VAR_BUF_SIZE -
|
||||
sizeof(struct efi_var_file);
|
||||
*remaining_variable_storage_size = efi_var_mem_free();
|
||||
*maximum_variable_size = EFI_VAR_BUF_SIZE -
|
||||
sizeof(struct efi_var_file) -
|
||||
sizeof(struct efi_var_entry);
|
||||
return EFI_SUCCESS;
|
||||
}
|
||||
|
||||
/**
|
||||
|
|
@ -1107,6 +729,10 @@ efi_status_t efi_init_variables(void)
|
|||
{
|
||||
efi_status_t ret;
|
||||
|
||||
ret = efi_var_mem_init();
|
||||
if (ret != EFI_SUCCESS)
|
||||
return ret;
|
||||
|
||||
ret = efi_init_secure_state();
|
||||
if (ret != EFI_SUCCESS)
|
||||
return ret;
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue