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