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UserspaceEmulator: Report heap buffer overflows :^)

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This commit is contained in:
Andreas Kling 2020-08-01 09:44:19 +02:00
parent 030edbd513
commit 80eef2c014
2 changed files with 36 additions and 4 deletions
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39
DevTools/UserspaceEmulator/MallocTracer.cpp
View file

@ -96,6 +96,18 @@ MallocTracer::Mallocation* MallocTracer::find_mallocation(FlatPtr address)
return nullptr;
}
MallocTracer::Mallocation* MallocTracer::find_mallocation_before(FlatPtr address)
{
Mallocation* found_mallocation = nullptr;
for (auto& mallocation : m_mallocations) {
if (mallocation.address >= address)
continue;
if (!found_mallocation || (mallocation.address > found_mallocation->address))
found_mallocation = &mallocation;
}
return found_mallocation;
}
void MallocTracer::audit_read(FlatPtr address, size_t size)
{
if (!m_auditing_enabled)
@ -105,8 +117,18 @@ void MallocTracer::audit_read(FlatPtr address, size_t size)
return;
auto* mallocation = find_mallocation(address);
if (!mallocation)
if (!mallocation) {
report("\n");
report("==%d== \033[31;1mHeap buffer overflow\033[0m, invalid %zu-byte read at address %p\n", getpid(), size, address);
Emulator::the().dump_backtrace();
if ((mallocation = find_mallocation_before(address))) {
size_t offset_into_mallocation = address - mallocation->address;
report("==%d== Address is %zu byte(s) after block of size %zu, allocated at:\n", getpid(), offset_into_mallocation - mallocation->size, mallocation->size);
Emulator::the().dump_backtrace(mallocation->malloc_backtrace);
}
return;
}
size_t offset_into_mallocation = address - mallocation->address;
@ -114,7 +136,7 @@ void MallocTracer::audit_read(FlatPtr address, size_t size)
report("\n");
report("==%d== \033[31;1mUse-after-free\033[0m, invalid %zu-byte read at address %p\n", getpid(), size, address);
Emulator::the().dump_backtrace();
report("==%d== Address is %zu bytes into block of size %zu, allocated at:\n", getpid(), offset_into_mallocation, mallocation->size);
report("==%d== Address is %zu byte(s) into block of size %zu, allocated at:\n", getpid(), offset_into_mallocation, mallocation->size);
Emulator::the().dump_backtrace(mallocation->malloc_backtrace);
report("==%d== Later freed at:\n", getpid(), offset_into_mallocation, mallocation->size);
Emulator::the().dump_backtrace(mallocation->free_backtrace);
@ -131,8 +153,17 @@ void MallocTracer::audit_write(FlatPtr address, size_t size)
return;
auto* mallocation = find_mallocation(address);
if (!mallocation)
if (!mallocation) {
report("\n");
report("==%d== \033[31;1mHeap buffer overflow\033[0m, invalid %zu-byte write at address %p\n", getpid(), size, address);
Emulator::the().dump_backtrace();
if ((mallocation = find_mallocation_before(address))) {
size_t offset_into_mallocation = address - mallocation->address;
report("==%d== Address is %zu byte(s) after block of size %zu, allocated at:\n", getpid(), offset_into_mallocation - mallocation->size, mallocation->size);
Emulator::the().dump_backtrace(mallocation->malloc_backtrace);
}
return;
}
size_t offset_into_mallocation = address - mallocation->address;
@ -140,7 +171,7 @@ void MallocTracer::audit_write(FlatPtr address, size_t size)
report("\n");
report("==%d== \033[31;1mUse-after-free\033[0m, invalid %zu-byte write at address %p\n", getpid(), size, address);
Emulator::the().dump_backtrace();
report("==%d== Address is %zu bytes into block of size %zu, allocated at:\n", getpid(), offset_into_mallocation, mallocation->size);
report("==%d== Address is %zu byte(s) into block of size %zu, allocated at:\n", getpid(), offset_into_mallocation, mallocation->size);
Emulator::the().dump_backtrace(mallocation->malloc_backtrace);
report("==%d== Later freed at:\n", getpid(), offset_into_mallocation, mallocation->size);
Emulator::the().dump_backtrace(mallocation->free_backtrace);

1
DevTools/UserspaceEmulator/MallocTracer.h
View file

@ -62,6 +62,7 @@ private:
};
Mallocation* find_mallocation(FlatPtr);
Mallocation* find_mallocation_before(FlatPtr);
bool is_reachable(const Mallocation&) const;
Vector<Mallocation> m_mallocations;