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Message-ID: <CANpmjNO82DrJSeeTS1m7WQKbfHD7FQKxf6e07EcP5qd80CdStA@mail.gmail.com>
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
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