On Tue, 15 Sep 2020 at 19:40, Nick Desaulniers <ndesaulni...@google.com> wrote: > > On Tue, Sep 15, 2020 at 10:21 AM Borislav Petkov <b...@alien8.de> wrote: > > > > On Tue, Sep 15, 2020 at 12:02:48PM -0500, Josh Poimboeuf wrote: > > > If somebody can share the .o file, I can take a look. > > > > If only I could reproduce... > > > > So I built: > > > > /home/share/src/llvm/tc-build/install/bin/clang-12 --version > > ClangBuiltLinux clang version 12.0.0 (https://github.com/llvm/llvm-project > > 74a9c6d7e1c49cd0e3a8e8072b8aa03f7a84caff) > > Target: x86_64-unknown-linux-gnu > > Thread model: posix > > InstalledDir: /home/share/src/llvm/tc-build/install/bin > > > > and I don't trigger that warning even with that compiler. > > > > What I do get is a lot of those pairs: > > > > init/calibrate.o: warning: objtool: asan.module_ctor()+0xc: call without > > frame pointer save/setup > > init/calibrate.o: warning: objtool: asan.module_dtor()+0xc: call without > > frame pointer save/setup > > init/version.o: warning: objtool: asan.module_ctor()+0xc: call without > > frame pointer save/setup > > init/version.o: warning: objtool: asan.module_dtor()+0xc: call without > > frame pointer save/setup > > certs/system_keyring.o: warning: objtool: asan.module_ctor()+0xc: call > > without frame pointer save/setup > > certs/system_keyring.o: warning: objtool: asan.module_dtor()+0xc: call > > without frame pointer save/setup
This one also appears with Clang 11. This is new I think because we started emitting ASAN ctors for globals redzone initialization. I think we really do not care about precise stack frames in these compiler-generated functions. So, would it be reasonable to make objtool ignore all *san.module_ctor and *san.module_dtor functions (we have them for ASAN, TSAN, MSAN)? Thanks, -- Marco
