[llvm-bugs] [Bug 52405] New: Integrated assembler allows trailing instruction prefixes

via llvm-bugs llvm-bugs at lists.llvm.org
Thu Nov 4 08:28:54 PDT 2021


            Bug ID: 52405
           Summary: Integrated assembler allows trailing instruction
           Product: clang
           Version: unspecified
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: -New Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: me at smitop.com
                CC: htmldeveloper at gmail.com, llvm-bugs at lists.llvm.org,
                    neeilans at live.com, richard-llvm at metafoo.co.uk

The LLVM integrated assembler incorrectly allows x86 instruction prefixes (like
LOCK) without an actual instruction being prefixed. This should be rejected
since LOCK isn't valid by itself: it's an instruction prefix that needs to be
followed by an actual instruction. For example:

    int main() {

The result is "Illegal instruction (core dumped)", since LOCK by itself isn't
an instruction. This issue also occurs with (unstable) inline assembly in Rust

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