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Message-ID: <alpine.DEB.2.21.1910101418500.27284@www.lameter.com>
Date: Thu, 10 Oct 2019 14:22:40 +0000 (UTC)
From: Christopher Lameter <cl@...ux.com>
To: Shyam Saini <mayhs11saini@...il.com>
cc: linux-mm@...ck.org, kernel-hardening@...ts.openwall.com,
Matthew Wilcox <willy@...radead.org>, Kees Cook <keescook@...omium.org>
Subject: Re: [PATCH] slab: Redefine ZERO_SIZE_PTR to include ERR_PTR range
On Thu, 10 Oct 2019, Shyam Saini wrote:
> This will help error related to ERR_PTR stand out better.
Maybe make ZERO_SIZE_PTR an ERRNO value instead? Then allow ERR_PTRs to be
used instead of ZERO_SIZE_PTRs
ERRNO_ZERO_OBJECT
or something like that?
> */
> -#define ZERO_SIZE_PTR ((void *)16)
#define ZERO_SIZE_PTR ((void *)-ERRNO_ZERO_OBJECT)
> +
> +#define ZERO_OR_NULL_PTR(x) ((unsigned long)(x) - 1 >= \
> + (unsigned long)ZERO_SIZE_PTR - 1)
And call this something different?
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