[all-commits] [llvm/llvm-project] 5ccb98: [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: 5ccb98144a2625908c6abf3aab9fb6d0c226d80b
      https://github.com/llvm/llvm-project/commit/5ccb98144a2625908c6abf3aab9fb6d0c226d80b
  Author: Anatoly Trosinenko <atrosinenko at accesssoftek.com>
  Date:   2025-04-24 (Thu, 24 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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