linux-kernel - Re: [PATCH 4/6] riscv: Fix EFI stub usage of KASAN instrumented string functions

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Date:   Wed, 04 Jan 2023 16:38:05 +0100
From:   Heiko Stübner <heiko@...ech.de>
To:     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>,
        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>,
        Alexandre Ghiti <alexghiti@...osinc.com>
Subject: Re: [PATCH 4/6] riscv: Fix EFI stub usage of KASAN instrumented string functions

Am Freitag, 16. Dezember 2022, 17:21:39 CET schrieb Alexandre Ghiti:
> The EFI stub must not use any KASAN instrumented code as the kernel
> proper did not initialize the thread pointer and the mapping for the
> KASAN shadow region.
> 
> Avoid using generic string functions by copying stub dependencies from
> lib/string.c to drivers/firmware/efi/libstub/string.c as RISC-V does
> not implement architecture-specific versions of those functions.
> 
> Signed-off-by: Alexandre Ghiti <alexghiti@...osinc.com>

I think a similar change already went into 6.2-rc1 [0],
though it seems to leave strcmp in place in image-vars.h



[0] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=da8dd0c75b3f82eb366eb1745fb473ea92c8c087