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[TSan] Fix p == end == ShadowMem::end in ShadowSet #144994

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Merged
merged 3 commits into from
Jun 21, 2025
Merged

[TSan] Fix p == end == ShadowMem::end in ShadowSet #144994

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515b000
{TSan] Fix p == end == ShadowMem::end in ShadowSet
Camsyn Jun 20, 2025
b337187
fix some issues adhering to the reviewer
Camsyn Jun 21, 2025
30fdb5b
Remove braces adhering to the coding standards
Camsyn Jun 21, 2025
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10 changes: 7 additions & 3 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 @@ -523,9 +523,9 @@ ALWAYS_INLINE USED void UnalignedMemoryAccess(ThreadState* thr, uptr pc,
}

void ShadowSet(RawShadow* p, RawShadow* end, RawShadow v) {
DCHECK_LE(p, end);
DCHECK_LT(p, end);
DCHECK(IsShadowMem(p));
DCHECK(p == end || IsShadowMem(end - 1));
DCHECK(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 @@ -569,6 +569,7 @@ static void MemoryRangeSet(uptr addr, uptr size, RawShadow val) {
RawShadow* mid1 =
Min(end, reinterpret_cast<RawShadow*>(RoundUp(
reinterpret_cast<uptr>(begin) + kPageSize / 2, kPageSize)));
// begin must < mid1
ShadowSet(begin, mid1, val);
// Reset middle part.
RawShadow* mid2 = RoundDown(end, kPageSize);
Expand All @@ -577,7 +578,10 @@ static void MemoryRangeSet(uptr addr, uptr size, RawShadow val) {
Die();
}
// Set the ending.
ShadowSet(mid2, end, val);
if (mid2 < end)
ShadowSet(mid2, end, val);
else
DCHECK_EQ(mid2, end);
}

void MemoryResetRange(ThreadState* thr, uptr pc, uptr addr, uptr size) {
Expand Down
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