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3 Commits

Author SHA1 Message Date
Evgeniy Stepanov 73583d5f2d [cfi] Safe handling of unaddressable vtable pointers (compiler-rt). 
Avoid crashing when printing diagnostics for vtable-related CFI
errors. In diagnostic mode, the frontend does an additional check of
the vtable pointer against the set of all known vtable addresses and
lets the runtime handler know if it is safe to inspect the vtable.

http://reviews.llvm.org/D16824

llvm-svn: 259717
 2016-02-03 22:19:04 +00:00
Evgeniy Stepanov 4a09234cb7 [cfi] Fix recovery from out-of-bounds vtable error. 
llvm-svn: 259007
 2016-01-28 00:37:54 +00:00
Evgeniy Stepanov 40d7d02d3d [cfi] Better handling of wild target address. 
This change enables diagnostics when the target address for a CFI
check is out of bounds of any known library, or even not in the
limits of the address space. This happens when casting pointers to
uninitialized memory.

Ubsan code does not yet handle some of these situations correctly,
so it is still possible to see a segmentation fault instead of a
proper diagnostic message once in a while.

llvm-svn: 258879
 2016-01-26 23:36:28 +00:00