linux-hardening - Re: [PATCH] crypto: hisilicon: Wipe entire pool on error

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Message-ID: <Y7hHRYUk6NypdZxT@dev-arch.thelio-3990X>
Date:   Fri, 6 Jan 2023 09:07:33 -0700
From:   Nathan Chancellor <nathan@...nel.org>
To:     Kees Cook <keescook@...omium.org>
Cc:     Weili Qian <qianweili@...wei.com>,
        Zhou Wang <wangzhou1@...ilicon.com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        "David S. Miller" <davem@...emloft.net>,
        linux-crypto@...r.kernel.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] crypto: hisilicon: Wipe entire pool on error

On Thu, Jan 05, 2023 at 08:19:48PM -0800, Kees Cook wrote:
> To work around a Clang __builtin_object_size bug that shows up under
> CONFIG_FORTIFY_SOURCE and UBSAN_BOUNDS, move the per-loop-iteration
> mem_block wipe into a single wipe of the entire pool structure after
> the loop.
> 
> Reported-by: Nathan Chancellor <nathan@...nel.org>
> Link: https://github.com/ClangBuiltLinux/linux/issues/1780
> Cc: Weili Qian <qianweili@...wei.com>
> Cc: Zhou Wang <wangzhou1@...ilicon.com>
> Cc: Herbert Xu <herbert@...dor.apana.org.au>
> Cc: "David S. Miller" <davem@...emloft.net>
> Cc: linux-crypto@...r.kernel.org
> Signed-off-by: Kees Cook <keescook@...omium.org>

Thanks for the patch!

Tested-by: Nathan Chancellor <nathan@...nel.org> # build

> ---
>  drivers/crypto/hisilicon/sgl.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/drivers/crypto/hisilicon/sgl.c b/drivers/crypto/hisilicon/sgl.c
> index 2b6f2281cfd6..0974b0041405 100644
> --- a/drivers/crypto/hisilicon/sgl.c
> +++ b/drivers/crypto/hisilicon/sgl.c
> @@ -124,9 +124,8 @@ struct hisi_acc_sgl_pool *hisi_acc_create_sgl_pool(struct device *dev,
>  	for (j = 0; j < i; j++) {
>  		dma_free_coherent(dev, block_size, block[j].sgl,
>  				  block[j].sgl_dma);
> -		memset(block + j, 0, sizeof(*block));
>  	}
> -	kfree(pool);
> +	kfree_sensitive(pool);
>  	return ERR_PTR(-ENOMEM);
>  }
>  EXPORT_SYMBOL_GPL(hisi_acc_create_sgl_pool);
> -- 
> 2.34.1
>