[all-commits] [llvm/llvm-project] 7a5af4: [BOLT] Gadget scanner: detect untrusted LR before ...

[Anatoly Trosinenko via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 7a5af4f6b850a3594a0510c66c64563f3e7da883
      https://github.com/llvm/llvm-project/commit/7a5af4f6b850a3594a0510c66c64563f3e7da883
  Author: Anatoly Trosinenko <atrosinenko at accesssoftek.com>
  Date:   2025-06-26 (Thu, 26 Jun 2025)

  Changed paths:
    M bolt/lib/Passes/PAuthGadgetScanner.cpp
    A bolt/test/binary-analysis/AArch64/gs-pauth-tail-calls.s

  Log Message:
  -----------
  [BOLT] Gadget scanner: detect untrusted LR before tail call (#137224)

Implement the detection of tail calls performed with untrusted link
register, which violates the assumption made on entry to every function.

Unlike other pauth gadgets, detection of this one involves some amount
of guessing which branch instructions should be checked as tail calls.



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