From: "Christoph Lameter (Ampere)" <cl@gentwo.org>
To: Kees Cook <kees@kernel.org>
Cc: Vlastimil Babka <vbabka@suse.cz>,
Pekka Enberg <penberg@kernel.org>,
David Rientjes <rientjes@google.com>,
Joonsoo Kim <iamjoonsoo.kim@lge.com>,
Andrew Morton <akpm@linux-foundation.org>,
Roman Gushchin <roman.gushchin@linux.dev>,
Hyeonggon Yoo <42.hyeyoo@gmail.com>,
linux-mm@kvack.org, Miguel Ojeda <ojeda@kernel.org>,
Nathan Chancellor <nathan@kernel.org>,
Marco Elver <elver@google.com>,
Nick Desaulniers <ndesaulniers@google.com>,
Przemek Kitszel <przemyslaw.kitszel@intel.com>,
linux-kernel@vger.kernel.org, linux-hardening@vger.kernel.org
Subject: Re: [PATCH 5/5] [DEBUG] slab: Report number of NULLings
Date: Mon, 24 Mar 2025 09:16:47 -0700 (PDT) [thread overview]
Message-ID: <e3437446-798d-f4f3-11d7-675f8886575b@gentwo.org> (raw)
In-Reply-To: <20250321204105.1898507-5-kees@kernel.org>
On Fri, 21 Mar 2025, Kees Cook wrote:
> diff --git a/include/linux/slab.h b/include/linux/slab.h
> index 2717ad238fa2..a4740c8b6ccb 100644
> --- a/include/linux/slab.h
> +++ b/include/linux/slab.h
> @@ -469,6 +469,8 @@ void __kfree(const void *objp);
> void __kfree_sensitive(const void *objp);
> size_t __ksize(const void *objp);
>
> +extern atomic_t count_nulled;
That is a scalability issue. Use a vmstat counter instead?
next prev parent reply other threads:[~2025-03-24 16:28 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-03-21 20:40 [RFC 0/5] slab: Set freed variables to NULL by default Kees Cook
2025-03-21 20:40 ` [PATCH 1/5] treewide: Replace kfree() casts with union members Kees Cook
2025-03-23 10:26 ` David Laight
2025-03-21 20:40 ` [PATCH 2/5] treewide: Prepare for kfree() to __kfree() rename Kees Cook
2025-03-21 20:40 ` [PATCH 3/5] compiler_types: Introduce __is_lvalue() Kees Cook
2025-03-22 3:38 ` Jann Horn
2025-03-22 7:03 ` Kees Cook
2025-03-21 20:41 ` [PATCH 4/5] slab: Set freed variables to NULL by default Kees Cook
2025-03-22 1:50 ` Jann Horn
2025-03-22 7:18 ` Kees Cook
2025-03-27 19:23 ` Jann Horn
2025-03-27 19:42 ` Matthew Wilcox
2025-03-21 20:41 ` [PATCH 5/5] [DEBUG] slab: Report number of NULLings Kees Cook
2025-03-24 16:16 ` Christoph Lameter (Ampere) [this message]
2025-03-25 19:45 ` Kees Cook
2025-03-27 13:00 ` [RFC 0/5] slab: Set freed variables to NULL by default Harry Yoo
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