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Date: Mon, 11 Jan 2021 18:49:37 +0100
From: Andrey Konovalov <andreyknvl@...gle.com>
To: Walter Wu <walter-zh.wu@...iatek.com>
Cc: Andrey Ryabinin <aryabinin@...tuozzo.com>,
Alexander Potapenko <glider@...gle.com>,
Dmitry Vyukov <dvyukov@...gle.com>,
Andrew Morton <akpm@...ux-foundation.org>,
Nathan Chancellor <natechancellor@...il.com>,
kasan-dev <kasan-dev@...glegroups.com>,
Linux Memory Management List <linux-mm@...ck.org>,
LKML <linux-kernel@...r.kernel.org>,
Linux ARM <linux-arm-kernel@...ts.infradead.org>,
wsd_upstream <wsd_upstream@...iatek.com>,
"moderated list:ARM/Mediatek SoC..."
<linux-mediatek@...ts.infradead.org>
Subject: Re: [PATCH v3] kasan: remove redundant config option
On Fri, Jan 8, 2021 at 5:09 AM Walter Wu <walter-zh.wu@...iatek.com> wrote:
>
> CONFIG_KASAN_STACK and CONFIG_KASAN_STACK_ENABLE both enable KASAN stack
> instrumentation, but we should only need one config, so that we remove
> CONFIG_KASAN_STACK_ENABLE and make CONFIG_KASAN_STACK workable. see [1].
>
> When enable KASAN stack instrumentation, then for gcc we could do
> no prompt and default value y, and for clang prompt and default
> value n.
>
> [1]: https://bugzilla.kernel.org/show_bug.cgi?id=210221
>
> Signed-off-by: Walter Wu <walter-zh.wu@...iatek.com>
> Suggested-by: Dmitry Vyukov <dvyukov@...gle.com>
> Cc: Andrey Ryabinin <aryabinin@...tuozzo.com>
> Cc: Dmitry Vyukov <dvyukov@...gle.com>
> Cc: Andrey Konovalov <andreyknvl@...gle.com>
> Cc: Alexander Potapenko <glider@...gle.com>
> Cc: Andrew Morton <akpm@...ux-foundation.org>
> Cc: Nathan Chancellor <natechancellor@...il.com>
> ---
>
> v2: make commit log to be more readable.
> v3: remain CONFIG_KASAN_STACK_ENABLE setting
> fix the pre-processors syntax
>
> ---
> arch/arm64/kernel/sleep.S | 2 +-
> arch/x86/kernel/acpi/wakeup_64.S | 2 +-
> include/linux/kasan.h | 2 +-
> lib/Kconfig.kasan | 8 ++------
> mm/kasan/common.c | 2 +-
> mm/kasan/kasan.h | 2 +-
> mm/kasan/report_generic.c | 2 +-
> scripts/Makefile.kasan | 10 ++++++++--
> 8 files changed, 16 insertions(+), 14 deletions(-)
>
> diff --git a/arch/arm64/kernel/sleep.S b/arch/arm64/kernel/sleep.S
> index 6bdef7362c0e..7c44ede122a9 100644
> --- a/arch/arm64/kernel/sleep.S
> +++ b/arch/arm64/kernel/sleep.S
> @@ -133,7 +133,7 @@ SYM_FUNC_START(_cpu_resume)
> */
> bl cpu_do_resume
>
> -#if defined(CONFIG_KASAN) && CONFIG_KASAN_STACK
> +#if defined(CONFIG_KASAN) && defined(CONFIG_KASAN_STACK)
> mov x0, sp
> bl kasan_unpoison_task_stack_below
> #endif
> diff --git a/arch/x86/kernel/acpi/wakeup_64.S b/arch/x86/kernel/acpi/wakeup_64.S
> index 5d3a0b8fd379..c7f412f4e07d 100644
> --- a/arch/x86/kernel/acpi/wakeup_64.S
> +++ b/arch/x86/kernel/acpi/wakeup_64.S
> @@ -112,7 +112,7 @@ SYM_FUNC_START(do_suspend_lowlevel)
> movq pt_regs_r14(%rax), %r14
> movq pt_regs_r15(%rax), %r15
>
> -#if defined(CONFIG_KASAN) && CONFIG_KASAN_STACK
> +#if defined(CONFIG_KASAN) && defined(CONFIG_KASAN_STACK)
> /*
> * The suspend path may have poisoned some areas deeper in the stack,
> * which we now need to unpoison.
> diff --git a/include/linux/kasan.h b/include/linux/kasan.h
> index 5e0655fb2a6f..35d1e9b2cbfa 100644
> --- a/include/linux/kasan.h
> +++ b/include/linux/kasan.h
> @@ -302,7 +302,7 @@ static inline void kasan_kfree_large(void *ptr, unsigned long ip) {}
>
> #endif /* CONFIG_KASAN */
>
> -#if defined(CONFIG_KASAN) && CONFIG_KASAN_STACK
> +#if defined(CONFIG_KASAN) && defined(CONFIG_KASAN_STACK)
> void kasan_unpoison_task_stack(struct task_struct *task);
> #else
> static inline void kasan_unpoison_task_stack(struct task_struct *task) {}
> diff --git a/lib/Kconfig.kasan b/lib/Kconfig.kasan
> index f5fa4ba126bf..fde82ec85f8f 100644
> --- a/lib/Kconfig.kasan
> +++ b/lib/Kconfig.kasan
> @@ -138,9 +138,10 @@ config KASAN_INLINE
>
> endchoice
>
> -config KASAN_STACK_ENABLE
> +config KASAN_STACK
> bool "Enable stack instrumentation (unsafe)" if CC_IS_CLANG && !COMPILE_TEST
Does this syntax mean that KASAN_STACK is only present for
CC_IS_CLANG? Or that it can only be disabled for CC_IS_CLANG?
Anyway, I think it's better to 1. allow to control KASAN_STACK
regardless of the compiler (as it was possible before), and 2. avoid
this "bool ... if ..." syntax as it's confusing.
> depends on KASAN_GENERIC || KASAN_SW_TAGS
> + default y if CC_IS_GCC
> help
> The LLVM stack address sanitizer has a know problem that
> causes excessive stack usage in a lot of functions, see
> @@ -154,11 +155,6 @@ config KASAN_STACK_ENABLE
> CONFIG_COMPILE_TEST. On gcc it is assumed to always be safe
> to use and enabled by default.
>
> -config KASAN_STACK
> - int
> - default 1 if KASAN_STACK_ENABLE || CC_IS_GCC
> - default 0
> -
> config KASAN_SW_TAGS_IDENTIFY
> bool "Enable memory corruption identification"
> depends on KASAN_SW_TAGS
> diff --git a/mm/kasan/common.c b/mm/kasan/common.c
> index 38ba2aecd8f4..bf8b073eed62 100644
> --- a/mm/kasan/common.c
> +++ b/mm/kasan/common.c
> @@ -63,7 +63,7 @@ void __kasan_unpoison_range(const void *address, size_t size)
> unpoison_range(address, size);
> }
>
> -#if CONFIG_KASAN_STACK
> +#ifdef CONFIG_KASAN_STACK
> /* Unpoison the entire stack for a task. */
> void kasan_unpoison_task_stack(struct task_struct *task)
> {
> diff --git a/mm/kasan/kasan.h b/mm/kasan/kasan.h
> index cc4d9e1d49b1..bdfdb1cff653 100644
> --- a/mm/kasan/kasan.h
> +++ b/mm/kasan/kasan.h
> @@ -224,7 +224,7 @@ void *find_first_bad_addr(void *addr, size_t size);
> const char *get_bug_type(struct kasan_access_info *info);
> void metadata_fetch_row(char *buffer, void *row);
>
> -#if defined(CONFIG_KASAN_GENERIC) && CONFIG_KASAN_STACK
> +#if defined(CONFIG_KASAN_GENERIC) && defined(CONFIG_KASAN_STACK)
> void print_address_stack_frame(const void *addr);
> #else
> static inline void print_address_stack_frame(const void *addr) { }
> diff --git a/mm/kasan/report_generic.c b/mm/kasan/report_generic.c
> index 8a9c889872da..4e16518d9877 100644
> --- a/mm/kasan/report_generic.c
> +++ b/mm/kasan/report_generic.c
> @@ -128,7 +128,7 @@ void metadata_fetch_row(char *buffer, void *row)
> memcpy(buffer, kasan_mem_to_shadow(row), META_BYTES_PER_ROW);
> }
>
> -#if CONFIG_KASAN_STACK
> +#ifdef CONFIG_KASAN_STACK
> static bool __must_check tokenize_frame_descr(const char **frame_descr,
> char *token, size_t max_tok_len,
> unsigned long *value)
> diff --git a/scripts/Makefile.kasan b/scripts/Makefile.kasan
> index 1e000cc2e7b4..abf231d209b1 100644
> --- a/scripts/Makefile.kasan
> +++ b/scripts/Makefile.kasan
> @@ -2,6 +2,12 @@
> CFLAGS_KASAN_NOSANITIZE := -fno-builtin
> KASAN_SHADOW_OFFSET ?= $(CONFIG_KASAN_SHADOW_OFFSET)
>
> +ifdef CONFIG_KASAN_STACK
> + stack_enable := 1
> +else
> + stack_enable := 0
> +endif
> +
> ifdef CONFIG_KASAN_GENERIC
>
> ifdef CONFIG_KASAN_INLINE
> @@ -27,7 +33,7 @@ else
> CFLAGS_KASAN := $(CFLAGS_KASAN_SHADOW) \
> $(call cc-param,asan-globals=1) \
> $(call cc-param,asan-instrumentation-with-call-threshold=$(call_threshold)) \
> - $(call cc-param,asan-stack=$(CONFIG_KASAN_STACK)) \
> + $(call cc-param,asan-stack=$(stack_enable)) \
> $(call cc-param,asan-instrument-allocas=1)
> endif
>
> @@ -42,7 +48,7 @@ else
> endif
>
> CFLAGS_KASAN := -fsanitize=kernel-hwaddress \
> - -mllvm -hwasan-instrument-stack=$(CONFIG_KASAN_STACK) \
> + -mllvm -hwasan-instrument-stack=$(stack_enable) \
> -mllvm -hwasan-use-short-granules=0 \
> $(instrumentation_flags)
>
> --
> 2.18.0
>
> --
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