[llvm-bugs] [Bug 46258] New: [AArch64] Some functions compiled without BTI with -fsanitize=cfi

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https://bugs.llvm.org/show_bug.cgi?id=46258

            Bug ID: 46258
           Summary: [AArch64] Some functions compiled without BTI with
                    -fsanitize=cfi
           Product: new-bugs
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: new bugs
          Assignee: peter at pcc.me.uk
          Reporter: samitolvanen at google.com
                CC: htmldeveloper at gmail.com, keescook at chromium.org,
                    llvm-bugs at lists.llvm.org

When compiling a binary with both -mbranch-protection=bti and -fsanitize=cfi,
LLVM warns about functions being compiled without BTI:

$ echo "void a() {}" > test.c
$ clang -target aarch64-linux-gnu- -mbranch-protection=bti \
   -flto=thin -fvisibility=default -fsanitize=cfi -fsanitize-cfi-cross-dso \
   -c test.c
$ ld.lld  -r -o test.lto.o test.o
warning: some functions compiled with BTI and some compiled without BTI
warning: not setting BTI in feature flags

Looking at the disassembly of test.o, it looks like the compiler generated
__cfi_check and __cfi_check_fail functions don't have the
"branch-target-enforcement" attribute.

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