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Date: Thu, 26 Nov 2015 01:37:51 +0100
From: "PaX Team" <pageexec@...email.hu>
To: linux-kernel@...r.kernel.org, Kees Cook <keescook@...omium.org>
CC: Kees Cook <keescook@...omium.org>, Andy Lutomirski <luto@...capital.net>,
"H. Peter Anvin" <hpa@...or.com>,
Michael Ellerman <mpe@...erman.id.au>,
Mathias Krause <minipli@...glemail.com>,
Ingo Molnar <mingo@...hat.com>, Thomas Gleixner <tglx@...utronix.de>,
x86@...nel.org, Arnd Bergmann <arnd@...db.de>,
Emese Revfy <re.emese@...il.com>, kernel-hardening@...ts.openwall.com,
linux-arch <linux-arch@...r.kernel.org>
Subject: Re: [PATCH v2 1/4] init: create cmdline param to disable readonly
On 25 Nov 2015 at 15:31, Kees Cook wrote:
> + rodata= [KNL]
> + on Mark read-only kernel memory as read-only (default).
> + off Leave read-only kernel memory writable for debugging.
> +
> +#ifdef CONFIG_DEBUG_RODATA
> +bool disable_mark_readonly;
__initdata?
> +static int __init set_debug_rodata(char *str)
> +{
> + if (!str)
> + return -EINVAL;
> + if (!strncmp(str, "on", 2))
> + disable_mark_readonly = false;
> + else if (!strncmp(str, "off", 3))
> + disable_mark_readonly = true;
maybe it's just me but the double negatives make my head spin,
perhaps call it enable_rodata instead (so that the variable name
isn't so disconnected from the option name)?
> +
> + return 0;
> +}
> +__setup("rodata=", set_debug_rodata);
> +
> +static void mark_readonly(void)
> +{
> + if (disable_mark_readonly)
> + pr_info("Kernel read-only memory marking disabled.\n");
> + else
> + mark_rodata_ro();
> +}
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