[Bug ld/30076] New: aarch64: stubs can add indirect branch that breaks BTI

[nsz at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=30076

            Bug ID: 30076
           Summary: aarch64: stubs can add indirect branch that breaks BTI
           Product: binutils
           Version: 2.35
            Status: NEW
          Severity: normal
          Priority: P2
         Component: ld
          Assignee: unassigned at sourceware dot org
          Reporter: nsz at gcc dot gnu.org
  Target Milestone: ---

ld may insert stubs with indirect branch if the call target is out of reach for
the direct call/branch instruction.

In BTI enaled code two stubs should be inserted with the second one having a
BTI and then direct branching to the original target.

alternatively BTI-safe code could be required to have BTI at the start of each
function that may be linker stub targets, but this would increase the generated
BTIs.

originally reported for gcc at
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106671

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