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Re: [Xen-devel] [PATCH v3 1/2] x86/ubsan: Don't perform alignment checking on supporting compilers
- To: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- From: Jan Beulich <JBeulich@xxxxxxxx>
- Date: Fri, 26 Jul 2019 07:33:52 +0000
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- Cc: "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Julien Grall <julien.grall@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>
- Delivery-date: Fri, 26 Jul 2019 07:37:32 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
- Thread-index: AQHVQ4R5ovDVdvhS/keGiUf3ND87nw==
- Thread-topic: [PATCH v3 1/2] x86/ubsan: Don't perform alignment checking on supporting compilers
>>> On 27.06.19 at 20:56, <andrew.cooper3@xxxxxxxxxx> wrote:
> GCC 5 introduced -fsanitize=alignment which is enabled by default by
> CONFIG_UBSAN. This trips a load of wont-fix cases in the ACPI tables and the
> hypercall page and stubs writing logic.
>
> It also causes the native Xen boot to crash before the console is set up, for
> an as-yet unidentified reason (most likley a wont-fix case earlier on boot).
>
> Disable alignment sanitisation on compilers which would try using it.
>
> Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>
I'm sorry for the delay - it was only now that I've been told how
to access the mails still delivered to my old mailbox between me
leaving the office that day and the switch of mailboxes actually
having happened.
Jan
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