From: Christopher Lameter <cl@linux.com>
To: Shyam Saini <mayhs11saini@gmail.com>
Cc: linux-mm@kvack.org, kernel-hardening@lists.openwall.com,
Matthew Wilcox <willy@infradead.org>,
Kees Cook <keescook@chromium.org>
Subject: Re: [PATCH] slab: Redefine ZERO_SIZE_PTR to include ERR_PTR range
Date: Thu, 10 Oct 2019 14:22:40 +0000 (UTC) [thread overview]
Message-ID: <alpine.DEB.2.21.1910101418500.27284@www.lameter.com> (raw)
In-Reply-To: <20191010103151.7708-1-mayhs11saini@gmail.com>
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?
next parent reply other threads:[~2019-10-10 14:22 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20191010103151.7708-1-mayhs11saini@gmail.com>
2019-10-10 14:22 ` Christopher Lameter [this message]
2019-10-10 17:44 ` [PATCH] slab: Redefine ZERO_SIZE_PTR to include ERR_PTR range Matthew Wilcox
2019-10-10 18:35 ` Christopher Lameter
2019-10-20 6:06 ` Shyam Saini
2019-10-20 15:38 ` Jann Horn
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