On Mon, Oct 21, 2024 at 09:19:57AM -0700, Yonghong Song wrote: SNIP > > > In my system, the gcc version is 13.1. So there is no need to explicitly add > > > CONFIG_X86_KERNEL_IBT to the selftests/bpf/config.x86_64 file. > > I had to enable it manualy for gcc 13.3.1 > > IIUC, the ci config is generated based on config + config.x86_64 + config.vm > in tools/testing/selftests/bpf directory. > > In my case .config is generated from config + config.x86_64 + config.vm > With my local gcc 11.5, I did > make olddefconfig > and I see CONFIG_X86_KERNEL_IBT=y is set. > > Maybe your base config is a little bit different from what ci used. > My local config is based on ci config + some more e.g. enabling KASAN etc. > > Could you debug a little more on why CONFIG_X86_KERNEL_IBT not enabled > by default in your case? For ok, I think I disabled that manually > > config X86_KERNEL_IBT > prompt "Indirect Branch Tracking" > def_bool y > depends on X86_64 && CC_HAS_IBT && HAVE_OBJTOOL > # https://github.com/llvm/llvm-project/commit/9d7001eba9c4cb311e03cd8cdc231f9e579f2d0f > depends on !LD_IS_LLD || LLD_VERSION >= 140000 > select OBJTOOL > select X86_CET > > default is 'y' so if all dependencies are met, CONFIG_X86_KERNEL_IBT > is supposed to be on by default. ah right, that should work then.. thanks for the details jirka
