static bool variable_is_present(efi_char16_t *variable_name, efi_guid_t *vendor, struct list_head *head) { struct efivar_entry *entry, *n; unsigned long strsize1, strsize2; bool found = false; strsize1 = ucs2_strsize(variable_name, 1024); list_for_each_entry_safe(entry, n, head, list) { strsize2 = ucs2_strsize(entry->var.VariableName, 1024); if (strsize1 == strsize2 && !memcmp(variable_name, &(entry->var.VariableName), strsize2) && !efi_guidcmp(entry->var.VendorGuid, *vendor)) { found = true; break; } }
static bool validate_load_option(efi_char16_t *var_name, int match, u8 *buffer, unsigned long len) { u16 filepathlength; int i, desclength = 0, namelen; namelen = ucs2_strnlen(var_name, EFI_VAR_NAME_LEN); /* Either "Boot" or "Driver" followed by four digits of hex */ for (i = match; i < match+4; i++) { if (var_name[i] > 127 || hex_to_bin(var_name[i] & 0xff) < 0) return true; } /* Reject it if there's 4 digits of hex and then further content */ if (namelen > match + 4) return false; /* A valid entry must be at least 8 bytes */ if (len < 8) return false; filepathlength = buffer[4] | buffer[5] << 8; /* * There's no stored length for the description, so it has to be * found by hand */ desclength = ucs2_strsize((efi_char16_t *)(buffer + 6), len - 6) + 2; /* Each boot entry must have a descriptor */ if (!desclength) return false; /* * If the sum of the length of the description, the claimed filepath * length and the original header are greater than the length of the * variable, it's malformed */ if ((desclength + filepathlength + 6) > len) return false; /* * And, finally, check the filepath */ return validate_device_path(var_name, match, buffer + desclength + 6, filepathlength); }
static unsigned long efi_name_size(efi_char16_t *name) { return ucs2_strsize(name, EFI_VAR_NAME_LEN) + 1; }