linux-kernel - Re: [PATCH v3] x86/pci: fix the function type for check_reserved

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Date:   Wed, 2 Dec 2020 11:39:52 -0800
From:   Kees Cook <keescook@...omium.org>
To:     Sami Tolvanen <samitolvanen@...gle.com>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Randy Dunlap <rdunlap@...radead.org>, x86@...nel.org,
        linux-kernel@...r.kernel.org, Sedat Dilek <sedat.dilek@...il.com>
Subject: Re: [PATCH v3] x86/pci: fix the function type for check_reserved_t

On Mon, Nov 30, 2020 at 11:39:00AM -0800, Sami Tolvanen wrote:
> e820__mapped_all is passed as a callback to is_mmconf_reserved,
> which expects a function of type:
> 
> typedef bool (*check_reserved_t)(u64 start, u64 end, unsigned type);
> 
> However, e820__mapped_all accepts enum e820_type as the last
> argument and this type mismatch trips indirect call checking with
> Clang's Control-Flow Integrity (CFI).
> 
> As is_mmconf_reserved only passes enum e820_type values for the
> type argument, change the typedef and the unused type argument in
> is_acpi_reserved to enum e820_type to fix the type mismatch.
> 
> Reported-by: Sedat Dilek <sedat.dilek@...il.com>
> Suggested-by: Borislav Petkov <bp@...en8.de>
> Signed-off-by: Sami Tolvanen <samitolvanen@...gle.com>

Reviewed-by: Kees Cook <keescook@...omium.org>

-- 
Kees Cook