2 Commits

Author	SHA1	Message	Date
Scott Constable	bb552531fd	[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	89f19db618	[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