[all-commits] [llvm/llvm-project] a9b57d: [PAC][libunwind] Protect dso_base argument of getI...

[Anatoly Trosinenko via All-commits]

  Branch: refs/heads/users/atrosinenko/libunwind-sign-dso-base-argument
  Home:   https://github.com/llvm/llvm-project
  Commit: a9b57d9263353690fc5a0cc9ce7a442a35922e29
      https://github.com/llvm/llvm-project/commit/a9b57d9263353690fc5a0cc9ce7a442a35922e29
  Author: Anatoly Trosinenko <atrosinenko at accesssoftek.com>
  Date:   2026-03-31 (Tue, 31 Mar 2026)

  Changed paths:
    M libunwind/src/UnwindCursor.hpp

  Log Message:
  -----------
  [PAC][libunwind] Protect dso_base argument of getInfoFromFdeCie

Pass the `dso_base` argument of `UnwindCursor::getInfoFromFdeCie`
as a constant reference to a `__ptrauth`-qualified type. This resolves
the signing oracle in getInfoFromFdeCie when assigning dso_base to the
`__ptrauth`-qualified `_info.extra` field. This commit applies the
changes similar to those done in #173765 to one more function argument.

In the current libunwind source, getInfoFromFdeCie is called three
times, with only one invocation not passing literal 0 as the dso_base
argument. In that only non-trivial case, the value to be passed as
dso_base is read from the `dso_base` field of `UnwindInfoSections`,
which is itself `__ptrauth`-qualified.



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