From: Kees Cook <keescook@chromium.org>
To: George-Aurelian Popescu <georgepope@google.com>
Cc: tglx@linutronix.de, catalin.marinas@arm.com, will@kernel.org,
kvmarm@lists.cs.columbia.edu, maskray@google.com, maz@kernel.org,
masahiroy@kernel.org, clang-built-linux@googlegroups.com,
linux-arm-kernel@lists.infradead.org, elver@google.com,
arnd@arndb.de, linux-kbuild@vger.kernel.org, broonie@kernel.org,
natechancellor@gmail.com, dvyukov@google.com,
michal.lkml@markovi.net, ndesaulniers@google.com,
linux-kernel@vger.kernel.org, akpm@linux-foundation.org
Subject: Re: [PATCH 06/14] Fix CFLAGS for UBSAN_BOUNDS on Clang
Date: Mon, 14 Sep 2020 15:13:14 -0700 [thread overview]
Message-ID: <202009141509.CDDC8C8@keescook> (raw)
In-Reply-To: <20200914172750.852684-7-georgepope@google.com>
On Mon, Sep 14, 2020 at 05:27:42PM +0000, George-Aurelian Popescu wrote:
> From: George Popescu <georgepope@google.com>
>
> When the kernel is compiled with Clang, UBSAN_BOUNDS inserts a brk after
> the handler call, preventing it from printing any information processed
> inside the buffer.
> For Clang -fsanitize=bounds expands to -fsanitize=array-bounds and
> -fsanitize=local-bounds, and the latter adds a brk after the handler
> call
That sounds like a compiler bug?
> Signed-off-by: George Popescu <georgepope@google.com>
> ---
> scripts/Makefile.ubsan | 9 ++++++++-
> 1 file changed, 8 insertions(+), 1 deletion(-)
>
> diff --git a/scripts/Makefile.ubsan b/scripts/Makefile.ubsan
> index 27348029b2b8..3d15ac346c97 100644
> --- a/scripts/Makefile.ubsan
> +++ b/scripts/Makefile.ubsan
> @@ -4,7 +4,14 @@ ifdef CONFIG_UBSAN_ALIGNMENT
> endif
>
> ifdef CONFIG_UBSAN_BOUNDS
> - CFLAGS_UBSAN += $(call cc-option, -fsanitize=bounds)
> + # For Clang -fsanitize=bounds translates to -fsanitize=array-bounds and
> + # -fsanitize=local-bounds; the latter adds a brk right after the
> + # handler is called.
> + ifdef CONFIG_CC_IS_CLANG
> + CFLAGS_UBSAN += $(call cc-option, -fsanitize=array-bounds)
This would mean losing the local-bounds coverage? Isn't that for locally
defined arrays on the stack?
> + else
> + CFLAGS_UBSAN += $(call cc-option, -fsanitize=bounds)
> + endif
> endif
>
> ifdef CONFIG_UBSAN_MISC
> --
> 2.28.0.618.gf4bc123cb7-goog
>
--
Kees Cook
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next prev parent reply other threads:[~2020-09-14 22:13 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-14 17:27 [PATCH 00/14] UBSan Enablement for hyp/nVHE code George-Aurelian Popescu
2020-09-14 17:27 ` [PATCH 01/14] KVM: arm64: Enable UBSan instrumentation in nVHE hyp code George-Aurelian Popescu
2020-09-14 17:27 ` [PATCH 02/14] KVM: arm64: Define a macro for storing a value inside a per_cpu variable George-Aurelian Popescu
2020-09-14 17:27 ` [PATCH 03/14] KVM: arm64: Add support for creating and checking a logging buffer inside hyp/nVHE George-Aurelian Popescu
2020-10-01 10:07 ` Andrew Scull
2020-09-14 17:27 ` [PATCH 04/14] KVM: arm64: Add support for buffer usage George-Aurelian Popescu
2020-09-14 17:27 ` [PATCH 05/14] KVM: arm64: Define a buffer that can pass UBSan data from hyp/nVHE to kernel George-Aurelian Popescu
2020-09-15 13:25 ` George Popescu
2020-10-01 10:51 ` Andrew Scull
2020-09-14 17:27 ` [PATCH 06/14] Fix CFLAGS for UBSAN_BOUNDS on Clang George-Aurelian Popescu
2020-09-14 21:17 ` Nick Desaulniers
2020-09-14 22:13 ` Kees Cook [this message]
2020-09-15 10:24 ` George Popescu
2020-09-15 11:18 ` Marco Elver
2020-09-15 12:01 ` George Popescu
2020-09-15 17:32 ` Marco Elver
2020-09-16 7:40 ` George Popescu
2020-09-16 8:32 ` Marco Elver
2020-09-16 12:14 ` George Popescu
2020-09-16 13:40 ` Marco Elver
2020-09-17 6:37 ` Marco Elver
2020-09-17 11:35 ` George Popescu
2020-09-17 22:21 ` Kees Cook
2020-09-17 22:17 ` Kees Cook
2020-09-14 17:27 ` [PATCH 07/14] KVM: arm64: Enable UBSAN_BOUNDS for the both the kernel and hyp/nVHE George-Aurelian Popescu
2020-10-01 10:57 ` Andrew Scull
2020-09-14 17:27 ` [PATCH 08/14] KVM: arm64: Enable UBsan check for unreachable code inside hyp/nVHE code George-Aurelian Popescu
2020-09-14 17:27 ` [PATCH 09/14] KVM: arm64: Enable shift out of bounds undefined behaviour check for hyp/nVHE George-Aurelian Popescu
2020-09-14 17:27 ` [PATCH 10/14] KVM: arm64: __ubsan_handle_load_invalid_value hyp/nVHE implementation George-Aurelian Popescu
2020-09-14 17:27 ` [PATCH 11/14] KVM: arm64: Detect type mismatch undefined behaviour from hyp/nVHE code George-Aurelian Popescu
2020-09-14 17:27 ` [PATCH 12/14] KVM: arm64: Detect arithmetic overflow is inside hyp/nVHE George-Aurelian Popescu
2020-09-14 17:27 ` [PATCH 13/14] KVM: arm64: Enable the CONFIG_TEST UBSan for PKVM George-Aurelian Popescu
2020-09-14 17:27 ` [PATCH 14/14] DO NOT MERGE: Enable configs to test the patch series George-Aurelian Popescu
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