[llvm-bugs] [Bug 42238] New: StackProtector misses some captures

via llvm-bugs llvm-bugs at lists.llvm.org
Tue Jun 11 12:00:10 PDT 2019


            Bug ID: 42238
           Summary: StackProtector misses some captures
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Common Code Generator Code
          Assignee: unassignedbugs at nondot.org
          Reporter: Matthew.Arsenault at amd.com
                CC: llvm-bugs at lists.llvm.org

StackProtector::HasAddressTaken has a whitelist of instructions that may
capture, and it is out of date. It assumes anything it doesn't know about
doesn't capture. Since this ancient pass was added, AddrSpaceCast and
AtomicCmpXChg have been added as new potential captures. This should use
CaptureTracking instead of maintaining its own capture detection

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