[llvm-bugs] [Bug 42095] New: [aarch64] implement __attribute__(("branch-protection=none")) fn attribute

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=42095

            Bug ID: 42095
           Summary: [aarch64] implement
                    __attribute__(("branch-protection=none")) fn attribute
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: LLVM Codegen
          Assignee: unassignedclangbugs at nondot.org
          Reporter: ndesaulniers at google.com
                CC: george.burgess.iv at gmail.com, keescook at chromium.org,
                    kristof.beyls at arm.com, llozano at chromium.org,
                    llvm-bugs at lists.llvm.org, manojgupta at google.com,
                    neeilans at live.com, oliver.stannard at arm.com,
                    peter.smith at linaro.org, richard-llvm at metafoo.co.uk,
                    srhines at google.com

via:
https://lore.kernel.org/linux-arm-kernel/201905300851.4A68705B0@keescook/T/#mab342863a3525c41af0d19c647c3c2b30907fb50
and: https://github.com/ClangBuiltLinux/linux/issues/501

It seems like ARMv8.3 Pointer Authentication instructions improve function
return address protection for the arm64 Linux kernel, but need to be able to
annotate functions as non-protected.

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