linux-kernel - Re: [PATCH] ubsan: introducing CONFIG_UBSAN_BOUNDS

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Date:   Sat, 19 Sep 2020 08:43:59 +0200
From:   Marco Elver <elver@...gle.com>
To:     George-Aurelian Popescu <georgepope@...gle.com>
Cc:     Masahiro Yamada <masahiroy@...nel.org>,
        Michal Marek <michal.lkml@...kovi.net>,
        Nathan Chancellor <natechancellor@...il.com>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Kees Cook <keescook@...omium.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Peter Zijlstra <peterz@...radead.or>,
        Arnd Bergmann <arnd@...db.de>,
        LKML <linux-kernel@...r.kernel.org>,
        clang-built-linux <clang-built-linux@...glegroups.com>,
        David Brazdil <dbrazdil@...gle.com>,
        George Popescu <georgepope@...roid.com>
Subject: Re: [PATCH] ubsan: introducing CONFIG_UBSAN_BOUNDS_LOCAL for Clang

On Fri, 18 Sep 2020 at 15:36, George-Aurelian Popescu
<georgepope@...gle.com> wrote:
>
> From: George Popescu <georgepope@...gle.com>
>
[...]
> Suggested-by: Marco Elver <elver@...gle.com>
> Reviewed-by: David Brazdil <dbrazdil@...gle.com>
> Signed-off-by: George Popescu <georgepope@...roid.com>

There's a mismatch between From/Author and Signed-off-by email address.

> ---
>  lib/Kconfig.ubsan      | 14 ++++++++++++++
>  scripts/Makefile.ubsan | 10 +++++++++-
>  2 files changed, 23 insertions(+), 1 deletion(-)
>
> diff --git a/lib/Kconfig.ubsan b/lib/Kconfig.ubsan
> index 774315de555a..553bd22e83ee 100644
> --- a/lib/Kconfig.ubsan
> +++ b/lib/Kconfig.ubsan
> @@ -47,6 +47,20 @@ config UBSAN_BOUNDS
>           to the {str,mem}*cpy() family of functions (that is addressed
>           by CONFIG_FORTIFY_SOURCE).
>
> +config UBSAN_BOUNDS_LOCAL
> +       bool "Perform array local bounds checking"
> +       depends on UBSAN_TRAP
> +       depends on CC_IS_CLANG
> +       depends on !UBSAN_KCOV_BROKEN
> +       help
> +         This option enables -fsanitize=local-bounds which traps when an
> +         exception/error is detected. Therefore, it should be enabled only
> +         if trapping is expected.
> +         Enabling this option detects errors due to accesses through a
> +         pointer that is derived from an object of a statically-known size,
> +         where an added offset (which may not be known statically) is
> +         out-of-bounds.
> +
>  config UBSAN_MISC
>         bool "Enable all other Undefined Behavior sanity checks"
>         default UBSAN
> diff --git a/scripts/Makefile.ubsan b/scripts/Makefile.ubsan
> index 27348029b2b8..4e3fff0745e8 100644
> --- a/scripts/Makefile.ubsan
> +++ b/scripts/Makefile.ubsan
> @@ -4,7 +4,15 @@ ifdef CONFIG_UBSAN_ALIGNMENT
>  endif
>
>  ifdef CONFIG_UBSAN_BOUNDS
> -      CFLAGS_UBSAN += $(call cc-option, -fsanitize=bounds)
> +      ifdef CONFIG_CC_IS_CLANG
> +            CFLAGS_UBSAN += -fsanitize=array-bounds
> +      else
> +            CFLAGS_UBSAN += $(call cc-option, -fsanitize=bounds)
> +      endif
> +endif
> +
> +ifdef CONFIG_UBSAN_LOCAL_BOUNDS

Unsure what happened here, but your Kconfig option is named
UBSAN_BOUNDS_LOCAL, yet this uses CONFIG_UBSAN_LOCAL_BOUNDS, so this
patch unfortunately doesn't work yet as you intended.

> +      CFLAGS_UBSAN += -fsanitize=local-bounds
>  endif

Thanks,
-- Marco