* [PATCH] kcov: Unconditionally add -fno-stack-protector to compiler options
@ 2020-06-15 18:43 Marco Elver
2020-06-15 19:04 ` Andrey Konovalov
0 siblings, 1 reply; 2+ messages in thread
From: Marco Elver @ 2020-06-15 18:43 UTC (permalink / raw)
To: elver, akpm
Cc: dvyukov, glider, andreyknvl, linux-kernel, kasan-dev, Nick Desaulniers
Unconditionally add -fno-stack-protector to KCOV's compiler options, as
all supported compilers support the option. This saves a compiler
invocation to determine if the option is supported.
Because Clang does not support -fno-conserve-stack, and
-fno-stack-protector was wrapped in the same cc-option, we were missing
-fno-stack-protector with Clang. Unconditionally adding this option
fixes this for Clang.
Suggested-by: Nick Desaulniers <ndesaulniers@google.com>
Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>
Signed-off-by: Marco Elver <elver@google.com>
---
Split out from series:
https://lkml.kernel.org/r/20200605082839.226418-2-elver@google.com
as there is no dependency on the preceding patch (which will be dropped).
---
kernel/Makefile | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/kernel/Makefile b/kernel/Makefile
index f3218bc5ec69..592cb549dcb8 100644
--- a/kernel/Makefile
+++ b/kernel/Makefile
@@ -35,7 +35,7 @@ KCOV_INSTRUMENT_stacktrace.o := n
KCOV_INSTRUMENT_kcov.o := n
KASAN_SANITIZE_kcov.o := n
KCSAN_SANITIZE_kcov.o := n
-CFLAGS_kcov.o := $(call cc-option, -fno-conserve-stack -fno-stack-protector)
+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)
--
2.27.0.290.gba653c62da-goog
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH] kcov: Unconditionally add -fno-stack-protector to compiler options
2020-06-15 18:43 [PATCH] kcov: Unconditionally add -fno-stack-protector to compiler options Marco Elver
@ 2020-06-15 19:04 ` Andrey Konovalov
0 siblings, 0 replies; 2+ messages in thread
From: Andrey Konovalov @ 2020-06-15 19:04 UTC (permalink / raw)
To: Marco Elver
Cc: Andrew Morton, Dmitry Vyukov, Alexander Potapenko, LKML,
kasan-dev, Nick Desaulniers
On Mon, Jun 15, 2020 at 8:43 PM Marco Elver <elver@google.com> wrote:
>
> Unconditionally add -fno-stack-protector to KCOV's compiler options, as
> all supported compilers support the option. This saves a compiler
> invocation to determine if the option is supported.
>
> Because Clang does not support -fno-conserve-stack, and
> -fno-stack-protector was wrapped in the same cc-option, we were missing
> -fno-stack-protector with Clang. Unconditionally adding this option
> fixes this for Clang.
>
> Suggested-by: Nick Desaulniers <ndesaulniers@google.com>
> Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>
> Signed-off-by: Marco Elver <elver@google.com>
> ---
> Split out from series:
> https://lkml.kernel.org/r/20200605082839.226418-2-elver@google.com
> as there is no dependency on the preceding patch (which will be dropped).
> ---
> kernel/Makefile | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/kernel/Makefile b/kernel/Makefile
> index f3218bc5ec69..592cb549dcb8 100644
> --- a/kernel/Makefile
> +++ b/kernel/Makefile
> @@ -35,7 +35,7 @@ KCOV_INSTRUMENT_stacktrace.o := n
> KCOV_INSTRUMENT_kcov.o := n
> KASAN_SANITIZE_kcov.o := n
> KCSAN_SANITIZE_kcov.o := n
> -CFLAGS_kcov.o := $(call cc-option, -fno-conserve-stack -fno-stack-protector)
> +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)
> --
> 2.27.0.290.gba653c62da-goog
>
Reviewed-by: Andrey Konovalov <andreyknvl@google.com>
^ permalink raw reply [flat|nested] 2+ messages in thread
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