| // Copyright 2017 The Fuchsia Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| #include <inttypes.h> |
| #include <lib/smbios/smbios.h> |
| #include <stdio.h> |
| #include <string.h> |
| #include <zircon/compiler.h> |
| #include <zircon/types.h> |
| |
| #include <algorithm> |
| #include <iterator> |
| |
| #include <fbl/algorithm.h> |
| |
| namespace { |
| |
| uint8_t ComputeChecksum(const uint8_t* data, size_t len) { |
| unsigned int sum = 0; |
| for (size_t i = 0; i < len; ++i) { |
| sum += data[i]; |
| } |
| return static_cast<uint8_t>(sum); |
| } |
| |
| } // namespace |
| |
| namespace smbios { |
| |
| StringTable::StringTable() {} |
| StringTable::~StringTable() {} |
| |
| zx_status_t StringTable::Init(const Header* h, size_t max_struct_len) { |
| if (h->length > max_struct_len) { |
| return ZX_ERR_IO_DATA_INTEGRITY; |
| } |
| |
| size_t max_string_table_len = max_struct_len - h->length; |
| start_ = reinterpret_cast<const char*>(h) + h->length; |
| |
| // Make sure the table is big enough to include the two trailing NULs |
| if (max_string_table_len < 2) { |
| return ZX_ERR_IO_DATA_INTEGRITY; |
| } |
| |
| // Check if the string table is empty |
| if (start_[0] == 0 && start_[1] == 0) { |
| length_ = 2; |
| return ZX_OK; |
| } |
| |
| size_t start_idx = 0; |
| if (start_[0] == 0) { |
| // We know that this isn't the end of the table, since the next byte |
| // isn't NUL. Skip examining this leading zero-length string in the |
| // loop below, so that we can simplify the iteration. During the |
| // iteration below, we have the invariant that either |
| // 1) i points to the start of the first string in the table and that |
| // string is not 0-length |
| // 2) i points to a subsequent string in the table, so a zero-length |
| // string implies two consecutive NULs were found (the end of table |
| // marker). |
| start_idx = 1; |
| } |
| |
| for (size_t i = start_idx; i < max_string_table_len;) { |
| size_t len = strnlen(start_ + i, max_string_table_len - i); |
| |
| if (len == 0) { |
| length_ = i + 1; // Include the trailing null |
| return ZX_OK; |
| } |
| |
| // strnlen returns the length not including the NUL. Note that if |
| // no NUL was found, it returns max_string_table_len - i, which will exceed |
| // the loop conditions. |
| i += len + 1; |
| } |
| return ZX_ERR_IO_DATA_INTEGRITY; |
| } |
| |
| zx_status_t StringTable::GetString(size_t idx, const char** out) const { |
| if (idx == 0) { |
| *out = "<null>"; |
| return ZX_OK; |
| } |
| *out = "<missing string>"; |
| |
| for (size_t i = 0; i < length_;) { |
| size_t len = strnlen(start_ + i, length_ - i); |
| |
| if (len == 0) { |
| if (i != 0) { |
| return ZX_ERR_NOT_FOUND; |
| } |
| |
| if (length_ - i < 2) { |
| return ZX_ERR_IO_DATA_INTEGRITY; |
| } |
| if (start_[i + 1] == 0) { |
| return ZX_ERR_NOT_FOUND; |
| } |
| } |
| if (idx == 1) { |
| *out = start_ + i; |
| return ZX_OK; |
| } |
| idx--; |
| i += len + 1; |
| } |
| ZX_DEBUG_ASSERT(false); |
| // Should not be reachable, since Init should have checked |
| return ZX_ERR_IO_DATA_INTEGRITY; |
| } |
| |
| void StringTable::Dump() const { |
| const char* str; |
| for (size_t i = 1; GetString(i, &str) == ZX_OK; ++i) { |
| printf(" str %zu: %s\n", i, str); |
| } |
| } |
| |
| bool EntryPoint2_1::IsValid() const { |
| if (memcmp(anchor_string, SMBIOS2_ANCHOR, std::size(anchor_string))) { |
| printf("smbios: bad anchor %4s\n", anchor_string); |
| return false; |
| } |
| |
| uint8_t real_length = length; |
| if (length != 0x1f) { |
| // 0x1e is allowed due to errata in the SMBIOS 2.1 spec. It really means |
| // 0x1f. |
| if (length == 0x1e) { |
| real_length = 0x1f; |
| } else { |
| printf("smbios: bad len: %u\n", real_length); |
| return false; |
| } |
| } |
| |
| if (ComputeChecksum(reinterpret_cast<const uint8_t*>(this), real_length) != 0) { |
| printf("smbios: bad checksum\n"); |
| return false; |
| } |
| if (ep_rev != 0) { |
| printf("smbios: bad version %u\n", ep_rev); |
| return false; |
| } |
| |
| if (memcmp(intermediate_anchor_string, SMBIOS2_INTERMEDIATE_ANCHOR, |
| std::size(intermediate_anchor_string))) { |
| printf("smbios: bad intermediate anchor %5s\n", intermediate_anchor_string); |
| return false; |
| } |
| if (ComputeChecksum(reinterpret_cast<const uint8_t*>(&intermediate_anchor_string), |
| real_length - offsetof(EntryPoint2_1, intermediate_anchor_string)) != 0) { |
| printf("smbios: bad intermediate checksum\n"); |
| return false; |
| } |
| |
| if ((uint32_t)(struct_table_phys + struct_table_length) < struct_table_phys) { |
| return false; |
| } |
| |
| return true; |
| } |
| |
| void EntryPoint2_1::Dump() const { |
| printf("SMBIOS EntryPoint v2.1:\n"); |
| printf(" specification version: %u.%u\n", major_ver, minor_ver); |
| printf(" max struct size: %u\n", max_struct_size); |
| printf(" struct table: %u bytes @0x%08x, %u entries\n", struct_table_length, struct_table_phys, |
| struct_count); |
| } |
| |
| bool SpecVersion::IncludesVersion(uint8_t spec_major_ver, uint8_t spec_minor_ver) const { |
| if (major_ver > spec_major_ver) { |
| return true; |
| } |
| if (major_ver < spec_major_ver) { |
| return false; |
| } |
| return minor_ver >= spec_minor_ver; |
| } |
| |
| void BiosInformationStruct2_0::Dump(const StringTable& st) const { |
| printf("SMBIOS BIOS Information Struct v2.0:\n"); |
| printf(" vendor: %s\n", st.GetString(vendor_str_idx)); |
| printf(" BIOS version: %s\n", st.GetString(bios_version_str_idx)); |
| printf(" BIOS starting address segment: 0x%04x\n", bios_starting_address_segment); |
| printf(" BIOS release date: %s\n", st.GetString(bios_release_date_str_idx)); |
| printf(" BIOS ROM size: 0x%02x\n", bios_rom_size); |
| printf(" BIOS characteristics: 0x%016" PRIx64 "\n", bios_characteristics); |
| for (size_t i = sizeof(*this); i < hdr.length; ++i) { |
| printf(" BIOS characteristics extended: 0x%02x\n", bios_characteristics_ext[i]); |
| } |
| } |
| |
| void BiosInformationStruct2_4::Dump(const StringTable& st) const { |
| printf("SMBIOS BIOS Information Struct v2.4:\n"); |
| printf(" vendor: %s\n", st.GetString(vendor_str_idx)); |
| printf(" BIOS version: %s\n", st.GetString(bios_version_str_idx)); |
| printf(" BIOS starting address segment: 0x%04x\n", bios_starting_address_segment); |
| printf(" BIOS release date: %s\n", st.GetString(bios_release_date_str_idx)); |
| printf(" BIOS ROM size: 0x%02x\n", bios_rom_size); |
| printf(" BIOS characteristics: 0x%016" PRIx64 "\n", bios_characteristics); |
| printf(" BIOS characteristics extended: 0x%04x\n", bios_characteristics_ext); |
| printf(" BIOS version number: %u.%u\n", bios_major_release, bios_minor_release); |
| printf(" EC version number: %u.%u\n", ec_major_release, ec_minor_release); |
| if (hdr.length > sizeof(*this)) { |
| printf(" %zu bytes of unknown trailing contents\n", hdr.length - sizeof(*this)); |
| } |
| } |
| |
| void SystemInformationStruct2_0::Dump(const StringTable& st) const { |
| printf("SMBIOS System Information Struct v2.0:\n"); |
| printf(" manufacturer: %s\n", st.GetString(manufacturer_str_idx)); |
| printf(" product: %s\n", st.GetString(product_name_str_idx)); |
| printf(" version: %s\n", st.GetString(version_str_idx)); |
| if (hdr.length > sizeof(*this)) { |
| printf(" %zu bytes of unknown trailing contents\n", hdr.length - sizeof(*this)); |
| } |
| } |
| |
| void SystemInformationStruct2_1::Dump(const StringTable& st) const { |
| printf("SMBIOS System Information Struct v2.1:\n"); |
| printf(" manufacturer: %s\n", st.GetString(manufacturer_str_idx)); |
| printf(" product: %s\n", st.GetString(product_name_str_idx)); |
| printf(" version: %s\n", st.GetString(version_str_idx)); |
| printf(" wakeup_type: 0x%x\n", wakeup_type); |
| if (hdr.length > sizeof(*this)) { |
| printf(" %zu bytes of unknown trailing contents\n", hdr.length - sizeof(*this)); |
| } |
| } |
| |
| void SystemInformationStruct2_4::Dump(const StringTable& st) const { |
| printf("SMBIOS System Information Struct v2.4:\n"); |
| printf(" manufacturer: %s\n", st.GetString(manufacturer_str_idx)); |
| printf(" product: %s\n", st.GetString(product_name_str_idx)); |
| printf(" version: %s\n", st.GetString(version_str_idx)); |
| printf(" wakeup_type: 0x%x\n", wakeup_type); |
| printf(" SKU: %s\n", st.GetString(sku_number_str_idx)); |
| printf(" family: %s\n", st.GetString(family_str_idx)); |
| if (hdr.length > sizeof(*this)) { |
| printf(" %zu bytes of unknown trailing contents\n", hdr.length - sizeof(*this)); |
| } |
| } |
| |
| #ifndef _KERNEL |
| void BaseboardInformationStruct::Dump(const StringTable& st) const { |
| printf("SMBIOS Baseboard Information Struct:\n"); |
| printf(" manufacturer: %s\n", st.GetString(manufacturer_str_idx)); |
| printf(" product: %s\n", st.GetString(product_name_str_idx)); |
| printf(" version: %s\n", st.GetString(version_str_idx)); |
| printf(" feature flags (%spresent): 0x%02x\n", feature_flags().has_value() ? "" : "not ", |
| feature_flags().value_or(0)); |
| printf(" location: %s\n", st.GetString(location_in_chassis_str_idx().value_or(0))); |
| printf(" board_type (%spresent): 0x%02x\n", board_type().has_value() ? "" : "not ", |
| board_type().value_or(0)); |
| } |
| #endif |
| |
| zx_status_t EntryPoint2_1::WalkStructs(uintptr_t struct_table_virt, StructWalkCallback cb) const { |
| size_t idx = 0; |
| uintptr_t curr_addr = struct_table_virt; |
| const uintptr_t table_end = curr_addr + struct_table_length; |
| while (curr_addr + sizeof(Header) < table_end) { |
| auto hdr = reinterpret_cast<const Header*>(curr_addr); |
| if (curr_addr + hdr->length > table_end) { |
| return ZX_ERR_IO_DATA_INTEGRITY; |
| } |
| StringTable st; |
| zx_status_t status = |
| st.Init(hdr, std::max(table_end - curr_addr, static_cast<size_t>(max_struct_size))); |
| if (status != ZX_OK) { |
| return status; |
| } |
| |
| status = cb(version(), hdr, st); |
| if (status == ZX_ERR_STOP) { |
| return ZX_OK; |
| } else if (status != ZX_OK && status != ZX_ERR_NEXT) { |
| return status; |
| } |
| idx++; |
| |
| if (idx == struct_count) { |
| return ZX_OK; |
| } |
| |
| // Skip over the embedded strings |
| curr_addr += hdr->length + st.length(); |
| } |
| |
| return ZX_ERR_IO_DATA_INTEGRITY; |
| } |
| |
| } // namespace smbios |