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Kernel: Add initial basic support for KASAN

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This commit adds minimal support for compiler-instrumentation based
memory access sanitization.
Currently we only support detection of kmalloc redzone accesses, and
kmalloc use-after-free accesses.

Support for inline checks (for improved performance), and for stack
use-after-return and use-after-return detection is left for future PRs.
This commit is contained in:
Idan Horowitz 2023-12-29 02:36:39 +02:00 • committed by Andreas Kling
parent 7ad7ae7000
commit f7a1f28d7f
10 changed files with 538 additions and 63 deletions
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13
Kernel/Heap/Heap.h
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@ -11,6 +11,7 @@
#include <AK/TemporaryChange.h>
#include <AK/Vector.h>
#include <AK/kmalloc.h>
#include <Kernel/Security/AddressSanitizer.h>
namespace Kernel {
@ -68,7 +69,7 @@ public:
return needed_chunks * CHUNK_SIZE + (needed_chunks + 7) / 8;
}
void* allocate(size_t size, size_t alignment, CallerWillInitializeMemory caller_will_initialize_memory)
void* allocate(size_t size, size_t alignment, [[maybe_unused]] CallerWillInitializeMemory caller_will_initialize_memory)
{
// The minimum possible alignment is CHUNK_SIZE, since we only track chunks here, nothing smaller.
if (alignment < CHUNK_SIZE)
@ -104,17 +105,23 @@ public:
VERIFY(first_chunk.value() <= aligned_first_chunk);
VERIFY(aligned_first_chunk + chunks_needed <= first_chunk.value() + chunks_needed + chunk_alignment);
#ifdef HAS_ADDRESS_SANITIZER
AddressSanitizer::mark_region((FlatPtr)a, real_size, (chunks_needed * CHUNK_SIZE), AddressSanitizer::ShadowType::Malloc);
#endif
u8* ptr = a->data;
a->allocation_size_in_chunks = chunks_needed;
m_bitmap.set_range_and_verify_that_all_bits_flip(aligned_first_chunk, chunks_needed, true);
m_allocated_chunks += chunks_needed;
#ifndef HAS_ADDRESS_SANITIZER
if (caller_will_initialize_memory == CallerWillInitializeMemory::No) {
if constexpr (HEAP_SCRUB_BYTE_ALLOC != 0) {
__builtin_memset(ptr, HEAP_SCRUB_BYTE_ALLOC, (chunks_needed * CHUNK_SIZE) - sizeof(AllocationHeader));
}
}
#endif
VERIFY((FlatPtr)ptr % alignment == 0);
return ptr;
@ -137,9 +144,13 @@ public:
VERIFY(m_allocated_chunks >= a->allocation_size_in_chunks);
m_allocated_chunks -= a->allocation_size_in_chunks;
#ifdef HAS_ADDRESS_SANITIZER
AddressSanitizer::fill_shadow((FlatPtr)a, a->allocation_size_in_chunks * CHUNK_SIZE, AddressSanitizer::ShadowType::Free);
#else
if constexpr (HEAP_SCRUB_BYTE_FREE != 0) {
__builtin_memset(a, HEAP_SCRUB_BYTE_FREE, a->allocation_size_in_chunks * CHUNK_SIZE);
}
#endif
}
bool contains(void const* ptr) const