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Author SHA1 Message Date
Scott Constable 0505181006 [X86] Fix to X86LoadValueInjectionRetHardeningPass for possible segfault 
`MBB.back()` could segfault if `MBB.empty()`. Fixed by checking for `MBB.empty()` in the loop.

Differential Revision: https://reviews.llvm.org/D77584
 2020-04-10 18:28:08 -07:00
Scott Constable f95a67d8b8 [X86] Add RET-hardening Support to mitigate Load Value Injection (LVI) 
Adding a pass that replaces every ret instruction with the sequence:

pop <scratch-reg>
lfence
jmp *<scratch-reg>

where <scratch-reg> is some available scratch register, according to the
calling convention of the function being mitigated.

Differential Revision: https://reviews.llvm.org/D75935
 2020-04-03 12:08:34 -07:00