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Date: Mon, 18 Mar 2019 16:38:56 +0100 From: Peter Zijlstra <peterz@...radead.org> To: torvalds@...ux-foundation.org, tglx@...utronix.de, hpa@...or.com, julien.thierry@....com, will.deacon@....com, luto@...capital.net, mingo@...nel.org, catalin.marinas@....com, james.morse@....com, valentin.schneider@....com, brgerst@...il.com, jpoimboe@...hat.com, luto@...nel.org, bp@...en8.de, dvlasenk@...hat.com Cc: linux-kernel@...r.kernel.org, peterz@...radead.org, dvyukov@...gle.com, rostedt@...dmis.org Subject: [PATCH 16/25] x86/uaccess,kcov: Disable stack protector kernel/kcov.o: warning: objtool: write_comp_data()+0x138: call to __stack_chk_fail() with UACCESS enabled kernel/kcov.o: warning: objtool: __sanitizer_cov_trace_pc()+0xd9: call to __stack_chk_fail() with UACCESS enabled All the other instrumentation (KASAN,UBSAN) also have stack protector disabled. Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org> --- kernel/Makefile | 1 + 1 file changed, 1 insertion(+) --- a/kernel/Makefile +++ b/kernel/Makefile @@ -30,6 +30,7 @@ KCOV_INSTRUMENT_extable.o := n # Don't self-instrument. KCOV_INSTRUMENT_kcov.o := n KASAN_SANITIZE_kcov.o := n +CFLAGS_kcov.o := $(call cc-option, -fno-conserve-stack -fno-stack-protector) # cond_syscall is currently not LTO compatible CFLAGS_sys_ni.o = $(DISABLE_LTO)
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