140 lines
4.1 KiB
C++
140 lines
4.1 KiB
C++
//===-- asan_debugging.cc -------------------------------------------------===//
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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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// This file contains various functions that are generally useful to call when
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// using a debugger (LLDB, GDB).
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//===----------------------------------------------------------------------===//
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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_mapping.h"
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#include "asan_report.h"
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#include "asan_thread.h"
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namespace __asan {
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void GetInfoForStackVar(uptr addr, AddressDescription *descr, AsanThread *t) {
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descr->name[0] = 0;
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descr->region_address = 0;
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descr->region_size = 0;
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descr->region_kind = "stack";
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AsanThread::StackFrameAccess access;
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if (!t->GetStackFrameAccessByAddr(addr, &access))
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return;
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InternalMmapVector<StackVarDescr> vars(16);
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if (!ParseFrameDescription(access.frame_descr, &vars)) {
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return;
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}
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for (uptr i = 0; i < vars.size(); i++) {
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if (access.offset <= vars[i].beg + vars[i].size) {
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internal_strncat(descr->name, vars[i].name_pos,
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Min(descr->name_size, vars[i].name_len));
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descr->region_address = addr - (access.offset - vars[i].beg);
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descr->region_size = vars[i].size;
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return;
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}
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}
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}
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void GetInfoForHeapAddress(uptr addr, AddressDescription *descr) {
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AsanChunkView chunk = FindHeapChunkByAddress(addr);
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descr->name[0] = 0;
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descr->region_address = 0;
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descr->region_size = 0;
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if (!chunk.IsValid()) {
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descr->region_kind = "heap-invalid";
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return;
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}
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descr->region_address = chunk.Beg();
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descr->region_size = chunk.UsedSize();
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descr->region_kind = "heap";
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}
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void AsanLocateAddress(uptr addr, AddressDescription *descr) {
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if (DescribeAddressIfShadow(addr, descr, /* print */ false)) {
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return;
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}
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if (GetInfoForAddressIfGlobal(addr, descr)) {
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return;
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}
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asanThreadRegistry().Lock();
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AsanThread *thread = FindThreadByStackAddress(addr);
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asanThreadRegistry().Unlock();
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if (thread) {
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GetInfoForStackVar(addr, descr, thread);
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return;
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}
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GetInfoForHeapAddress(addr, descr);
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}
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uptr AsanGetStack(uptr addr, uptr *trace, uptr size, u32 *thread_id,
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bool alloc_stack) {
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AsanChunkView chunk = FindHeapChunkByAddress(addr);
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if (!chunk.IsValid()) return 0;
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StackTrace stack(nullptr, 0);
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if (alloc_stack) {
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if (chunk.AllocTid() == kInvalidTid) return 0;
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stack = chunk.GetAllocStack();
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if (thread_id) *thread_id = chunk.AllocTid();
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} else {
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if (chunk.FreeTid() == kInvalidTid) return 0;
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stack = chunk.GetFreeStack();
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if (thread_id) *thread_id = chunk.FreeTid();
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}
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if (trace && size) {
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size = Min(size, Min(stack.size, kStackTraceMax));
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for (uptr i = 0; i < size; i++)
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trace[i] = StackTrace::GetPreviousInstructionPc(stack.trace[i]);
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return size;
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}
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return 0;
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}
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} // namespace __asan
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using namespace __asan;
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SANITIZER_INTERFACE_ATTRIBUTE
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const char *__asan_locate_address(uptr addr, char *name, uptr name_size,
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uptr *region_address, uptr *region_size) {
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AddressDescription descr = { name, name_size, 0, 0, 0 };
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AsanLocateAddress(addr, &descr);
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if (region_address) *region_address = descr.region_address;
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if (region_size) *region_size = descr.region_size;
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return descr.region_kind;
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}
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SANITIZER_INTERFACE_ATTRIBUTE
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uptr __asan_get_alloc_stack(uptr addr, uptr *trace, uptr size, u32 *thread_id) {
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return AsanGetStack(addr, trace, size, thread_id, /* alloc_stack */ true);
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}
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SANITIZER_INTERFACE_ATTRIBUTE
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uptr __asan_get_free_stack(uptr addr, uptr *trace, uptr size, u32 *thread_id) {
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return AsanGetStack(addr, trace, size, thread_id, /* alloc_stack */ false);
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}
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SANITIZER_INTERFACE_ATTRIBUTE
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void __asan_get_shadow_mapping(uptr *shadow_scale, uptr *shadow_offset) {
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if (shadow_scale)
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*shadow_scale = SHADOW_SCALE;
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if (shadow_offset)
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*shadow_offset = SHADOW_OFFSET;
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}
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