linux-hardening - Re: [PATCH] x86/platform/uv: Annotate struct uv_rtc_timer_head with __counted

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Date: Thu, 28 Sep 2023 12:32:17 -0500
From: Steve Wahl <steve.wahl@....com>
To: Kees Cook <keescook@...omium.org>
Cc: Steve Wahl <steve.wahl@....com>,
        Dimitri Sivanich <dimitri.sivanich@....com>,
        Russ Anderson <russ.anderson@....com>,
        Darren Hart <dvhart@...radead.org>,
        Andy Shevchenko <andy@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>,
        Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
        "H. Peter Anvin" <hpa@...or.com>, platform-driver-x86@...r.kernel.org,
        Justin Ernst <justin.ernst@....com>, Kyle Meyer <kyle.meyer@....com>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>, Tom Rix <trix@...hat.com>,
        linux-kernel@...r.kernel.org, llvm@...ts.linux.dev,
        linux-hardening@...r.kernel.org
Subject: Re: [PATCH] x86/platform/uv: Annotate struct uv_rtc_timer_head with
 __counted_by

On Fri, Sep 22, 2023 at 10:51:51AM -0700, Kees Cook wrote:
> Prepare for the coming implementation by GCC and Clang of the __counted_by
> attribute. Flexible array members annotated with __counted_by can have
> their accesses bounds-checked at run-time checking via CONFIG_UBSAN_BOUNDS
> (for array indexing) and CONFIG_FORTIFY_SOURCE (for strcpy/memcpy-family
> functions).
> 
> As found with Coccinelle[1], add __counted_by for struct uv_rtc_timer_head.
> 
> [1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci
> 
> Cc: Steve Wahl <steve.wahl@....com>
> Cc: Mike Travis <mike.travis@....com>
> Cc: Dimitri Sivanich <dimitri.sivanich@....com>
> Cc: Russ Anderson <russ.anderson@....com>
> Cc: Darren Hart <dvhart@...radead.org>
> Cc: Andy Shevchenko <andy@...radead.org>
> 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: x86@...nel.org
> Cc: "H. Peter Anvin" <hpa@...or.com>
> Cc: platform-driver-x86@...r.kernel.org
> Signed-off-by: Kees Cook <keescook@...omium.org>
> 
> ---
>  arch/x86/platform/uv/uv_time.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/arch/x86/platform/uv/uv_time.c b/arch/x86/platform/uv/uv_time.c
> index 54663f3e00cb..ff5afc8a5a41 100644
> --- a/arch/x86/platform/uv/uv_time.c
> +++ b/arch/x86/platform/uv/uv_time.c
> @@ -53,7 +53,7 @@ struct uv_rtc_timer_head {
>  	struct {
>  		int	lcpu;		/* systemwide logical cpu number */
>  		u64	expires;	/* next timer expiration for this cpu */
> -	} cpu[];
> +	} cpu[] __counted_by(ncpus);
>  };
>  
>  /*
> -- 
> 2.34.1

Looks good, thanks.

Reviewed-by: Steve Wahl <steve.wahl@....com>



-- 
Steve Wahl, Hewlett Packard Enterprise