diff options
| author | Dmitry Vyukov <dvyukov@google.com> | 2013-10-16 15:35:12 +0000 |
|---|---|---|
| committer | Dmitry Vyukov <dvyukov@google.com> | 2013-10-16 15:35:12 +0000 |
| commit | 01a7ce809bf7cc627d73c045c70bcca9891f632c (patch) | |
| tree | a1842a84d98e9864554665ffb352bf9c198b3d03 /lib/tsan/rtl/tsan_sync.cc | |
| parent | cca8e781e5353cba810a0ec3a814ddde2c4934e7 (diff) | |
tsan: move shadow stack from thread descriptors to fixed addresses
This allows to increase max shadow stack size to 64K,
and reliably catch shadow stack overflows instead of silently
corrupting memory.
git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@192797 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/tsan/rtl/tsan_sync.cc')
| -rw-r--r-- | lib/tsan/rtl/tsan_sync.cc | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/lib/tsan/rtl/tsan_sync.cc b/lib/tsan/rtl/tsan_sync.cc index c6ddcdb37..f8f3c40fa 100644 --- a/lib/tsan/rtl/tsan_sync.cc +++ b/lib/tsan/rtl/tsan_sync.cc @@ -265,6 +265,11 @@ void StackTrace::ObtainCurrent(ThreadState *thr, uptr toppc) { n_ = c_ - !!toppc; } } else { + // Cap potentially huge stacks. + if (n_ + !!toppc > kTraceStackSize) { + start = n_ - kTraceStackSize + !!toppc; + n_ = kTraceStackSize - !!toppc; + } s_ = (uptr*)internal_alloc(MBlockStackTrace, (n_ + !!toppc) * sizeof(s_[0])); } |