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Kernel/SysFS: Don't expose SMBIOS blobs if can't find SMBIOS tables

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Don't assume that a platform machine will provide at least the 32 bit
version of SMBIOS tables. If there's no SMBIOS tables, don't expose
directory entries in the /sys/bios/ directory.
This commit is contained in:
Liav A 2021-08-22 11:55:24 +03:00 • committed by Andreas Kling
parent 8d3304f853
commit cd52eb3103
Notes: sideshowbarker 2024-07-18 05:23:06 +09:00
1 changed files with 13 additions and 1 deletions
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14
Kernel/Arch/PC/BIOS.cpp
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@ -102,6 +102,16 @@ UNMAP_AFTER_INIT void BIOSSysFSDirectory::initialize()
void BIOSSysFSDirectory::create_components()
{
if (m_dmi_entry_point.is_null() || m_smbios_structure_table.is_null())
return;
if (m_dmi_entry_point_length == 0) {
dbgln("BIOSSysFSDirectory: invalid dmi entry length");
return;
}
if (m_smbios_structure_table_length == 0) {
dbgln("BIOSSysFSDirectory: invalid smbios structure table length");
return;
}
auto dmi_entry_point = DMIEntryPointExposedBlob::create(m_dmi_entry_point, m_dmi_entry_point_length);
m_components.append(dmi_entry_point);
auto smbios_table = SMBIOSExposedTable::create(m_smbios_structure_table, m_smbios_structure_table_length);
@ -138,7 +148,9 @@ UNMAP_AFTER_INIT BIOSSysFSDirectory::BIOSSysFSDirectory()
: SysFSDirectory("bios", SysFSComponentRegistry::the().root_directory())
{
auto entry_32bit = find_dmi_entry32bit_point();
m_dmi_entry_point = entry_32bit.value();
if (entry_32bit.has_value()) {
m_dmi_entry_point = entry_32bit.value();
}
auto entry_64bit = find_dmi_entry64bit_point();
if (entry_64bit.has_value()) {