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[TSan] Make Shadow/Meta region inclusive-exclusive #144647

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Merged
merged 2 commits into from
Jun 19, 2025
Merged

[TSan] Make Shadow/Meta region inclusive-exclusive #144647

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5d8750f
[TSan] Make Shadow/Meta region inclusive-exclusive
Camsyn Jun 14, 2025
2e26762
Add a DCHECK adhering to the suggestion
Camsyn Jun 18, 2025
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4 changes: 2 additions & 2 deletions compiler-rt/lib/tsan/rtl/tsan_platform.h
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Original file line number Diff line number Diff line change
Expand Up @@ -931,7 +931,7 @@ bool IsAppMem(uptr mem) { return SelectMapping<IsAppMemImpl>(mem); }
struct IsShadowMemImpl {
template <typename Mapping>
static bool Apply(uptr mem) {
return mem >= Mapping::kShadowBeg && mem <= Mapping::kShadowEnd;
return mem >= Mapping::kShadowBeg && mem < Mapping::kShadowEnd;
}
};

Expand All @@ -943,7 +943,7 @@ bool IsShadowMem(RawShadow *p) {
struct IsMetaMemImpl {
template <typename Mapping>
static bool Apply(uptr mem) {
return mem >= Mapping::kMetaShadowBeg && mem <= Mapping::kMetaShadowEnd;
return mem >= Mapping::kMetaShadowBeg && mem < Mapping::kMetaShadowEnd;
}
};

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4 changes: 2 additions & 2 deletions compiler-rt/lib/tsan/rtl/tsan_rtl_access.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -525,7 +525,7 @@ ALWAYS_INLINE USED void UnalignedMemoryAccess(ThreadState* thr, uptr pc,
void ShadowSet(RawShadow* p, RawShadow* end, RawShadow v) {
DCHECK_LE(p, end);
DCHECK(IsShadowMem(p));
DCHECK(IsShadowMem(end));
DCHECK(p == end || IsShadowMem(end - 1));
UNUSED const uptr kAlign = kShadowCnt * kShadowSize;
DCHECK_EQ(reinterpret_cast<uptr>(p) % kAlign, 0);
DCHECK_EQ(reinterpret_cast<uptr>(end) % kAlign, 0);
Expand Down Expand Up @@ -669,7 +669,7 @@ void MemoryAccessRangeT(ThreadState* thr, uptr pc, uptr addr, uptr size) {
RawShadow* shadow_mem = MemToShadow(addr);
DPrintf2("#%d: MemoryAccessRange: @%p %p size=%d is_read=%d\n", thr->tid,
(void*)pc, (void*)addr, (int)size, is_read);

DCHECK_NE(size, 0);
#if SANITIZER_DEBUG
if (!IsAppMem(addr)) {
Printf("Access to non app mem start: %p\n", (void*)addr);
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