linux-kernel - Re: [PATCH v4 3/6] riscv: Move DTB_EARLY_BASE

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <873574uymv.fsf@all.your.base.are.belong.to.us>
Date:   Fri, 17 Feb 2023 15:58:48 +0100
From:   Björn Töpel <bjorn@...nel.org>
To:     Alexandre Ghiti <alexghiti@...osinc.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Andrey Ryabinin <ryabinin.a.a@...il.com>,
        Alexander Potapenko <glider@...gle.com>,
        Andrey Konovalov <andreyknvl@...il.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Vincenzo Frascino <vincenzo.frascino@....com>,
        Ard Biesheuvel <ardb@...nel.org>,
        Conor Dooley <conor@...nel.org>,
        linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org,
        kasan-dev@...glegroups.com, linux-efi@...r.kernel.org
Cc:     Alexandre Ghiti <alexghiti@...osinc.com>
Subject: Re: [PATCH v4 3/6] riscv: Move DTB_EARLY_BASE_VA to the kernel
 address space

Alexandre Ghiti <alexghiti@...osinc.com> writes:

> The early virtual address should lie in the kernel address space for
> inline kasan instrumentation to succeed, otherwise kasan tries to
> dereference an address that does not exist in the address space (since
> kasan only maps *kernel* address space, not the userspace).
>
> Simply use the very first address of the kernel address space for the
> early fdt mapping.
>
> It allowed an Ubuntu kernel to boot successfully with inline
> instrumentation.
>
> Signed-off-by: Alexandre Ghiti <alexghiti@...osinc.com>

Reviewed-by: Björn Töpel <bjorn@...osinc.com>