From: Slava Bacherikov slava@bacher09.org
commit 7d32e69310d67e6b04af04f26193f79dfc2f05c7 upstream.
Currently turning on DEBUG_INFO_SPLIT when DEBUG_INFO_BTF is also enabled will produce invalid btf file, since gen_btf function in link-vmlinux.sh script doesn't handle *.dwo files.
Enabling DEBUG_INFO_REDUCED will also produce invalid btf file, and using GCC_PLUGIN_RANDSTRUCT with BTF makes no sense.
Fixes: e83b9f55448a ("kbuild: add ability to generate BTF type info for vmlinux") Reported-by: Jann Horn jannh@google.com Reported-by: Liu Yiding liuyd.fnst@cn.fujitsu.com Signed-off-by: Slava Bacherikov slava@bacher09.org Signed-off-by: Daniel Borkmann daniel@iogearbox.net Reviewed-by: Kees Cook keescook@chromium.org Acked-by: KP Singh kpsingh@google.com Acked-by: Andrii Nakryiko andriin@fb.com Link: https://lore.kernel.org/bpf/20200402204138.408021-1-slava@bacher09.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- lib/Kconfig.debug | 2 ++ 1 file changed, 2 insertions(+)
--- a/lib/Kconfig.debug +++ b/lib/Kconfig.debug @@ -223,6 +223,8 @@ config DEBUG_INFO_DWARF4 config DEBUG_INFO_BTF bool "Generate BTF typeinfo" depends on DEBUG_INFO + depends on !DEBUG_INFO_SPLIT && !DEBUG_INFO_REDUCED + depends on !GCC_PLUGIN_RANDSTRUCT || COMPILE_TEST help Generate deduplicated BTF type information from DWARF debug info. Turning this on expects presence of pahole tool, which will convert