On Mon, Oct 10, 2022 at 06:20:00PM -0700, Linus Torvalds wrote: > The other thing I notice from just doing a build is that I now get > > vmlinux.o: warning: objtool: kasan_report+0x12: call to > stackleak_track_stack() with UACCESS enabled So kasan_report() is already marked as being special; and it does the mandatory user_access_save() / user_access_restore() things to fix it up. But it looks like kasan code itself is now getting instrumented by the stackleak stuff and that inserts a call outside of the user_access_save()/restore() thing, and *that* is getting flagged. Looking at mm/kasan/Makefile it disables a lot of the instrumentation, but perhaps not enough? I've not yet tried to reproduce, I'm taking this is allyesconfig or something glorious like that? LLVM-15 ?
