forked from OSchip/llvm-project
125 lines
3.9 KiB
C++
125 lines
3.9 KiB
C++
//===-- asan_activation.cc --------------------------------------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file is a part of AddressSanitizer, an address sanity checker.
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//
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// ASan activation/deactivation logic.
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//===----------------------------------------------------------------------===//
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#include "asan_activation.h"
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#include "asan_allocator.h"
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#include "asan_flags.h"
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#include "asan_internal.h"
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#include "asan_poisoning.h"
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#include "asan_stack.h"
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#include "sanitizer_common/sanitizer_flags.h"
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namespace __asan {
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static struct AsanDeactivatedFlags {
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AllocatorOptions allocator_options;
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int malloc_context_size;
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bool poison_heap;
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bool coverage;
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const char *coverage_dir;
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void OverrideFromActivationFlags() {
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Flags f;
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CommonFlags cf;
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// Copy the current activation flags.
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allocator_options.CopyTo(&f, &cf);
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cf.malloc_context_size = malloc_context_size;
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f.poison_heap = poison_heap;
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cf.coverage = coverage;
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cf.coverage_dir = coverage_dir;
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// Check if activation flags need to be overriden.
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// FIXME: Add diagnostic to check that activation flags string doesn't
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// contain any other flags.
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if (const char *env = GetEnv("ASAN_ACTIVATION_OPTIONS")) {
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cf.ParseFromString(env);
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f.ParseFromString(env);
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}
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// Override from getprop asan.options.
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char buf[100];
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GetExtraActivationFlags(buf, sizeof(buf));
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cf.ParseFromString(buf);
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f.ParseFromString(buf);
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allocator_options.SetFrom(&f, &cf);
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malloc_context_size = cf.malloc_context_size;
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poison_heap = f.poison_heap;
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coverage = cf.coverage;
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coverage_dir = cf.coverage_dir;
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}
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void Print() {
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Report(
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"quarantine_size_mb %d, max_redzone %d, poison_heap %d, "
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"malloc_context_size %d, alloc_dealloc_mismatch %d, "
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"allocator_may_return_null %d, coverage %d, coverage_dir %s\n",
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allocator_options.quarantine_size_mb, allocator_options.max_redzone,
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poison_heap, malloc_context_size,
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allocator_options.alloc_dealloc_mismatch,
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allocator_options.may_return_null, coverage, coverage_dir);
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}
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} asan_deactivated_flags;
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static bool asan_is_deactivated;
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void AsanDeactivate() {
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CHECK(!asan_is_deactivated);
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VReport(1, "Deactivating ASan\n");
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// Stash runtime state.
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GetAllocatorOptions(&asan_deactivated_flags.allocator_options);
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asan_deactivated_flags.malloc_context_size = GetMallocContextSize();
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asan_deactivated_flags.poison_heap = CanPoisonMemory();
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asan_deactivated_flags.coverage = common_flags()->coverage;
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asan_deactivated_flags.coverage_dir = common_flags()->coverage_dir;
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// Deactivate the runtime.
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SetCanPoisonMemory(false);
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SetMallocContextSize(1);
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ReInitializeCoverage(false, nullptr);
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AllocatorOptions disabled = asan_deactivated_flags.allocator_options;
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disabled.quarantine_size_mb = 0;
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disabled.min_redzone = 16; // Redzone must be at least 16 bytes long.
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disabled.max_redzone = 16;
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disabled.alloc_dealloc_mismatch = false;
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disabled.may_return_null = true;
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ReInitializeAllocator(disabled);
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asan_is_deactivated = true;
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}
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void AsanActivate() {
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if (!asan_is_deactivated) return;
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VReport(1, "Activating ASan\n");
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asan_deactivated_flags.OverrideFromActivationFlags();
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SetCanPoisonMemory(asan_deactivated_flags.poison_heap);
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SetMallocContextSize(asan_deactivated_flags.malloc_context_size);
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ReInitializeCoverage(asan_deactivated_flags.coverage,
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asan_deactivated_flags.coverage_dir);
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ReInitializeAllocator(asan_deactivated_flags.allocator_options);
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asan_is_deactivated = false;
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if (common_flags()->verbosity) {
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Report("Activated with flags:\n");
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asan_deactivated_flags.Print();
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}
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}
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} // namespace __asan
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