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126 lines
4.5 KiB
126 lines
4.5 KiB
//===-- common.h ------------------------------------------------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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// This file contains code that is common between the crash handler and the
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// GuardedPoolAllocator.
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#ifndef GWP_ASAN_COMMON_H_
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#define GWP_ASAN_COMMON_H_
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#include "gwp_asan/definitions.h"
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#include "gwp_asan/options.h"
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#include <stddef.h>
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#include <stdint.h>
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namespace gwp_asan {
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enum class Error {
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UNKNOWN,
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USE_AFTER_FREE,
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DOUBLE_FREE,
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INVALID_FREE,
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BUFFER_OVERFLOW,
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BUFFER_UNDERFLOW
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};
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const char *ErrorToString(const Error &E);
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static constexpr uint64_t kInvalidThreadID = UINT64_MAX;
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// Get the current thread ID, or kInvalidThreadID if failure. Note: This
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// implementation is platform-specific.
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uint64_t getThreadID();
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// This struct contains all the metadata recorded about a single allocation made
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// by GWP-ASan. If `AllocationMetadata.Addr` is zero, the metadata is non-valid.
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struct AllocationMetadata {
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// The number of bytes used to store a compressed stack frame. On 64-bit
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// platforms, assuming a compression ratio of 50%, this should allow us to
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// store ~64 frames per trace.
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static constexpr size_t kStackFrameStorageBytes = 256;
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// Maximum number of stack frames to collect on allocation/deallocation. The
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// actual number of collected frames may be less than this as the stack
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// frames are compressed into a fixed memory range.
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static constexpr size_t kMaxTraceLengthToCollect = 128;
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// Records the given allocation metadata into this struct.
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void RecordAllocation(uintptr_t Addr, size_t Size);
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// Record that this allocation is now deallocated.
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void RecordDeallocation();
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struct CallSiteInfo {
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// Record the current backtrace to this callsite.
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void RecordBacktrace(options::Backtrace_t Backtrace);
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// The compressed backtrace to the allocation/deallocation.
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uint8_t CompressedTrace[kStackFrameStorageBytes];
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// The thread ID for this trace, or kInvalidThreadID if not available.
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uint64_t ThreadID = kInvalidThreadID;
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// The size of the compressed trace (in bytes). Zero indicates that no
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// trace was collected.
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size_t TraceSize = 0;
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};
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// The address of this allocation. If zero, the rest of this struct isn't
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// valid, as the allocation has never occurred.
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uintptr_t Addr = 0;
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// Represents the actual size of the allocation.
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size_t Size = 0;
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CallSiteInfo AllocationTrace;
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CallSiteInfo DeallocationTrace;
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// Whether this allocation has been deallocated yet.
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bool IsDeallocated = false;
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};
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// This holds the state that's shared between the GWP-ASan allocator and the
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// crash handler. This, in conjunction with the Metadata array, forms the entire
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// set of information required for understanding a GWP-ASan crash.
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struct AllocatorState {
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// Returns whether the provided pointer is a current sampled allocation that
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// is owned by this pool.
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GWP_ASAN_ALWAYS_INLINE bool pointerIsMine(const void *Ptr) const {
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uintptr_t P = reinterpret_cast<uintptr_t>(Ptr);
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return P < GuardedPagePoolEnd && GuardedPagePool <= P;
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}
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// Returns the address of the N-th guarded slot.
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uintptr_t slotToAddr(size_t N) const;
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// Returns the largest allocation that is supported by this pool.
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size_t maximumAllocationSize() const;
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// Gets the nearest slot to the provided address.
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size_t getNearestSlot(uintptr_t Ptr) const;
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// Returns whether the provided pointer is a guard page or not. The pointer
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// must be within memory owned by this pool, else the result is undefined.
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bool isGuardPage(uintptr_t Ptr) const;
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// The number of guarded slots that this pool holds.
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size_t MaxSimultaneousAllocations = 0;
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// Pointer to the pool of guarded slots. Note that this points to the start of
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// the pool (which is a guard page), not a pointer to the first guarded page.
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uintptr_t GuardedPagePool = 0;
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uintptr_t GuardedPagePoolEnd = 0;
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// Cached page size for this system in bytes.
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size_t PageSize = 0;
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// The type and address of an internally-detected failure. For INVALID_FREE
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// and DOUBLE_FREE, these errors are detected in GWP-ASan, which will set
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// these values and terminate the process.
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Error FailureType = Error::UNKNOWN;
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uintptr_t FailureAddress = 0;
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};
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} // namespace gwp_asan
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#endif // GWP_ASAN_COMMON_H_
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