Messages in this thread | | | Date | Fri, 11 Nov 2022 10:32:55 -0800 | From | Kees Cook <> | Subject | Re: [PATCH] arm64: ftrace: Define ftrace_stub_graph only with FUNCTION_GRAPH_TRACER |
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On Wed, Nov 09, 2022 at 07:28:31PM +0000, Sami Tolvanen wrote: > The 0-day bot reports that arm64 builds with CONFIG_CFI_CLANG + > CONFIG_FTRACE are broken when CONFIG_FUNCTION_GRAPH_TRACER is not > enabled: > > ld.lld: error: undefined symbol: __kcfi_typeid_ftrace_stub_graph > >>> referenced by entry-ftrace.S:299 (arch/arm64/kernel/entry-ftrace.S:299) > >>> arch/arm64/kernel/entry-ftrace.o:(.text+0x48) in archive vmlinux.a > > This is caused by ftrace_stub_graph using SYM_TYPE_FUNC_START when > the address of the function is not taken in any C translation unit. > > Fix the build by only defining ftrace_stub_graph when it's actually > needed, i.e. with CONFIG_FUNCTION_GRAPH_TRACER. > > Link: https://lore.kernel.org/lkml/202210251659.tRMs78RH-lkp@intel.com/ > Fixes: 883bbbffa5a4 ("ftrace,kcfi: Separate ftrace_stub() and ftrace_stub_graph()") > Reported-by: kernel test robot <lkp@intel.com> > Signed-off-by: Sami Tolvanen <samitolvanen@google.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
-- Kees Cook
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