From: Kees Cook <keescook@chromium.org>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org,
linux-hardening@vger.kernel.org
Subject: Re: [PATCH] mempool: Use kmalloc_size_roundup() to match ksize() usage
Date: Tue, 18 Oct 2022 22:37:07 -0700 [thread overview]
Message-ID: <202210182235.3B19DFCB28@keescook> (raw)
In-Reply-To: <20221018155137.f6898d165aade2e3a5f0b2d3@linux-foundation.org>
On Tue, Oct 18, 2022 at 03:51:37PM -0700, Andrew Morton wrote:
> On Tue, 18 Oct 2022 02:03:29 -0700 Kees Cook <keescook@chromium.org> wrote:
>
> > Round up allocations with kmalloc_size_roundup() so that mempool's use
> > of ksize() is always accurate and no special handling of the memory is
> > needed by KASAN, UBSAN_BOUNDS, nor FORTIFY_SOURCE.
>
> Confused. If the special handling is not needed, why doesn't the patch
> removed the no longer needed special handling?
The special handling is in the ksize() implementation, so it can't be
removed[1] until all the ksize()-affected users are updated to see their
true allocation sizes first.
[1] https://lore.kernel.org/lkml/20220923202822.2667581-16-keescook@chromium.org/
--
Kees Cook
next prev parent reply other threads:[~2022-10-19 5:37 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-10-18 9:03 Kees Cook
2022-10-18 22:51 ` Andrew Morton
2022-10-19 5:37 ` Kees Cook [this message]
2022-10-24 18:03 ` Vlastimil Babka (SUSE)
2022-10-25 22:55 ` Kees Cook
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