Commit-ID: 1a81023ae4b9288f17d886a24d0c2b1fece56995 Gitweb: https://git.kernel.org/tip/1a81023ae4b9288f17d886a24d0c2b1fece56995 Author: Peter Zijlstra <peterz@xxxxxxxxxxxxx> AuthorDate: Thu, 7 Mar 2019 19:54:25 +0100 Committer: Ingo Molnar <mingo@xxxxxxxxxx> CommitDate: Wed, 3 Apr 2019 09:40:56 +0200 x86/uaccess, kcov: Disable stack protector New tooling noticed this mishap: 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@xxxxxxxxxxxxx> Cc: Borislav Petkov <bp@xxxxxxxxx> Cc: Josh Poimboeuf <jpoimboe@xxxxxxxxxx> Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx> Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx> Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx> Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx> --- kernel/Makefile | 1 + 1 file changed, 1 insertion(+) diff --git a/kernel/Makefile b/kernel/Makefile index 6c57e78817da..62471e75a2b0 100644 --- 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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