[PATCH] D16702: [cfi] Safe handling of unaddressable vtable pointers.

[Evgeniy Stepanov via llvm-commits]

eugenis created this revision.
eugenis added reviewers: pcc, kcc.
eugenis added a subscriber: llvm-commits.
eugenis set the repository for this revision to rL LLVM.

This change attempts to safely check the cast validity, even when
vtable itself, or its typeinfo object, are unaddressable. The check
is quite slow (requires a system call), so we only do this when an
error is already detected to avoid slowing down the vptr sanitizer.

Repository:
  rL LLVM

http://reviews.llvm.org/D16702

Files:
  lib/ubsan/ubsan_type_hash_itanium.cc
  test/cfi/cross-dso/target_out_of_bounds.cpp

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