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apci_drv: ignore invalid ACPI tables

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This commit is contained in:
Alexander Boettcher 2018-03-05 11:09:19 +01:00 committed by Christian Helmuth
parent d332ee3fcd
commit 8e9390e964
1 changed files with 27 additions and 12 deletions
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39
repos/os/src/drivers/acpi/acpi.cc
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@ -348,6 +348,8 @@ class Table_wrapper
return sum;
}
bool valid() { return !checksum((uint8_t *)_table, _table->size); }
/**
* Is this the FACP table
*/
@ -446,11 +448,6 @@ class Table_wrapper
Genode::log("table mapped '", Genode::Cstring(_name), "' at ", _table, " "
"(from ", Genode::Hex(_base), ") "
"size ", Genode::Hex(_table->size));
if (checksum((uint8_t *)_table, _table->size)) {
Genode::error("checksum mismatch for ", Genode::Cstring(_name));
throw -1;
}
}
};
@ -1191,6 +1188,13 @@ class Acpi_table
uint32_t dsdt = 0;
{
Table_wrapper table(_memory, entries[i]);
if (!table.valid()) {
Genode::error("ignoring table '", table.name(),
"' - checksum error");
continue;
}
if (table.is_facp()) {
Fadt fadt(reinterpret_cast<Genode::addr_t>(table->signature));
dsdt = fadt.read<Fadt::Dsdt>();
@ -1221,14 +1225,21 @@ class Acpi_table
}
}
if (dsdt) {
Table_wrapper table(_memory, dsdt);
if (table.is_searched()) {
if (verbose)
Genode::log("Found dsdt ", table.name());
if (!dsdt)
continue;
Element::parse(alloc, table.table());
}
Table_wrapper table(_memory, dsdt);
if (!table.valid()) {
Genode::error("ignoring table '", table.name(),
"' - checksum error");
continue;
}
if (table.is_searched()) {
if (verbose)
Genode::log("Found dsdt ", table.name());
Element::parse(alloc, table.table());
}
}
@ -1296,11 +1307,15 @@ class Acpi_table
if (acpi_revision != 0 && xsdt && sizeof(addr_t) != sizeof(uint32_t)) {
/* running 64bit and xsdt is valid */
Table_wrapper table(_memory, xsdt);
if (!table.valid()) throw -1;
uint64_t * entries = reinterpret_cast<uint64_t *>(table.table() + 1);
_parse_tables(alloc, entries, table.entry_count(entries));
} else {
/* running (32bit) or (64bit and xsdt isn't valid) */
Table_wrapper table(_memory, rsdt);
if (!table.valid()) throw -1;
uint32_t * entries = reinterpret_cast<uint32_t *>(table.table() + 1);
_parse_tables(alloc, entries, table.entry_count(entries));
}