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Date: Tue, 9 Apr 2019 10:32:35 +0100
From: Mark Rutland <mark.rutland@....com>
To: Alexander Potapenko <glider@...gle.com>
Cc: yamada.masahiro@...ionext.com, jmorris@...ei.org, serge@...lyn.com,
linux-security-module@...r.kernel.org, linux-kbuild@...r.kernel.org,
ndesaulniers@...gle.com, kcc@...gle.com, dvyukov@...gle.com,
keescook@...omium.org, sspatil@...roid.com,
kernel-hardening@...ts.openwall.com
Subject: Re: [PATCH v3 2/2] initmem: introduce CONFIG_INIT_ALL_HEAP
On Mon, Apr 08, 2019 at 07:04:18PM +0200, Alexander Potapenko wrote:
> This config option enables CONFIG_SLUB_DEBUG and CONFIG_PAGE_POISONING
> without the need to pass any boot parameters.
>
> No performance optimizations are done at the moment to reduce double
> initialization of memory regions.
>
> Signed-off-by: Alexander Potapenko <glider@...gle.com>
> Cc: Masahiro Yamada <yamada.masahiro@...ionext.com>
> Cc: James Morris <jmorris@...ei.org>
> Cc: "Serge E. Hallyn" <serge@...lyn.com>
> Cc: Nick Desaulniers <ndesaulniers@...gle.com>
> Cc: Kostya Serebryany <kcc@...gle.com>
> Cc: Dmitry Vyukov <dvyukov@...gle.com>
> Cc: Kees Cook <keescook@...omium.org>
> Cc: Sandeep Patil <sspatil@...roid.com>
> Cc: linux-security-module@...r.kernel.org
> Cc: linux-kbuild@...r.kernel.org
> Cc: kernel-hardening@...ts.openwall.com
> ---
> v3:
> - addressed comments by Masahiro Yamada (Kconfig fixes)
> ---
> mm/page_poison.c | 5 +++++
> mm/slub.c | 2 ++
> security/Kconfig.initmem | 11 +++++++++++
> 3 files changed, 18 insertions(+)
>
> diff --git a/mm/page_poison.c b/mm/page_poison.c
> index 21d4f97cb49b..a1985f33f635 100644
> --- a/mm/page_poison.c
> +++ b/mm/page_poison.c
> @@ -12,9 +12,14 @@ static bool want_page_poisoning __read_mostly;
>
> static int __init early_page_poison_param(char *buf)
> {
> +#ifdef CONFIG_INIT_ALL_HEAP
> + want_page_poisoning = true;
> + return 0;
> +#else
> if (!buf)
> return -EINVAL;
> return strtobool(buf, &want_page_poisoning);
> +#endif
> }
> early_param("page_poison", early_page_poison_param);
IIUC this is only called if page_poison is passed on the command line,
so want_page_poisoning won't be set automatically unless that's passed.
Presumably you want to initialize it at definition with:
static bool want_page_poisoning __read_mostly = IS_ENABLED(CONFIG_INIT_ALL_HEAP);
with:
#ifndef CONFIG_INIT_ALL_HEAP
static int __init early_page_poison_param(char *buf)
{
...
}
early_param("page_poison", early_page_poison_param);
#endif
... so that it can't be disabled?
Thanks,
Mark.
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