linux-hardening - Re: [PATCH] x86/paravirt: Fix tlb_remove_table function callback prototype warning

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Date:   Thu, 27 Jul 2023 07:14:27 +0200
From:   Juergen Gross <jgross@...e.com>
To:     Kees Cook <keescook@...omium.org>
Cc:     kernel test robot <lkp@...el.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Sami Tolvanen <samitolvanen@...gle.com>,
        Nathan Chancellor <nathan@...nel.org>,
        Ajay Kaher <akaher@...are.com>,
        Alexey Makhalov <amakhalov@...are.com>,
        VMware PV-Drivers Reviewers <pv-drivers@...are.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        virtualization@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org, x86@...nel.org, llvm@...ts.linux.dev,
        linux-hardening@...r.kernel.org
Subject: Re: [PATCH] x86/paravirt: Fix tlb_remove_table function callback
 prototype warning

On 27.07.23 01:11, Kees Cook wrote:
> Under W=1, this warning is visible in Clang 16 and newer:
> 
> arch/x86/kernel/paravirt.c:337:4: warning: cast from 'void (*)(struct mmu_gather *, struct page *)' to 'void (*)(struct mmu_gather *, void *)' converts to incompatible function type [-Wcast-function-type-strict]
>                             (void (*)(struct mmu_gather *, void *))tlb_remove_page,
>                             ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> 
> Add a direct wrapper instead, which will make this warning (and
> potential KCFI failures) go away.
> 
> Reported-by: kernel test robot <lkp@...el.com>
> Closes: https://lore.kernel.org/oe-kbuild-all/202307260332.pJntWR6o-lkp@intel.com/
> Cc: Juergen Gross <jgross@...e.com>
> Cc: Peter Zijlstra <peterz@...radead.org>
> Cc: Sami Tolvanen <samitolvanen@...gle.com>
> Cc: Nathan Chancellor <nathan@...nel.org>
> Cc: Ajay Kaher <akaher@...are.com>
> Cc: Alexey Makhalov <amakhalov@...are.com>
> Cc: VMware PV-Drivers Reviewers <pv-drivers@...are.com>
> Cc: Thomas Gleixner <tglx@...utronix.de>
> Cc: Ingo Molnar <mingo@...hat.com>
> Cc: Borislav Petkov <bp@...en8.de>
> Cc: Dave Hansen <dave.hansen@...ux.intel.com>
> Cc: virtualization@...ts.linux-foundation.org
> Signed-off-by: Kees Cook <keescook@...omium.org>

Reviewed-by: Juergen Gross <jgross@...e.com>


Juergen


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