diff options
Diffstat (limited to 'lib/asan/asan_allocator.cc')
| -rw-r--r-- | lib/asan/asan_allocator.cc | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/lib/asan/asan_allocator.cc b/lib/asan/asan_allocator.cc index 6db2b4db5..7010b6023 100644 --- a/lib/asan/asan_allocator.cc +++ b/lib/asan/asan_allocator.cc @@ -523,6 +523,18 @@ struct Allocator { AsanThread *t = GetCurrentThread(); m->free_tid = t ? t->tid() : 0; m->free_context_id = StackDepotPut(*stack); + + Flags &fl = *flags(); + if (fl.max_free_fill_size > 0) { + // We have to skip the chunk header, it contains free_context_id. + uptr scribble_start = (uptr)m + kChunkHeaderSize + kChunkHeader2Size; + if (m->UsedSize() >= kChunkHeader2Size) { // Skip Header2 in user area. + uptr size_to_fill = m->UsedSize() - kChunkHeader2Size; + size_to_fill = Min(size_to_fill, (uptr)fl.max_free_fill_size); + REAL(memset)((void *)scribble_start, fl.free_fill_byte, size_to_fill); + } + } + // Poison the region. PoisonShadow(m->Beg(), RoundUpTo(m->UsedSize(), SHADOW_GRANULARITY), |