[all-commits] [llvm/llvm-project] 7d1cbb: [BOLT] Gadget scanner: detect untrusted LR before ...

[Anatoly Trosinenko via All-commits]

  Branch: refs/heads/users/atrosinenko/bolt-gs-untrusted-lr-before-tail-call
  Home:   https://github.com/llvm/llvm-project
  Commit: 7d1cbb97817e615a5fa8841d72a18643b5722114
      https://github.com/llvm/llvm-project/commit/7d1cbb97817e615a5fa8841d72a18643b5722114
  Author: Anatoly Trosinenko <atrosinenko at accesssoftek.com>
  Date:   2025-04-30 (Wed, 30 Apr 2025)

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

  Log Message:
  -----------
  [BOLT] Gadget scanner: detect untrusted LR before tail call

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, this one involves some amount of guessing
which branch instructions should be checked as tail calls.



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