linux-kernel - Re: [PATCH v2 2/4] introduce post-init read-only memory

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Message-ID: <56564F0F.3158.108D0B78@pageexec.freemail.hu>
Date:	Thu, 26 Nov 2015 01:15:11 +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 2/4] introduce post-init read-only memory

On 25 Nov 2015 at 15:31, Kees Cook wrote:

> diff --git a/include/asm-generic/vmlinux.lds.h b/include/asm-generic/vmlinux.lds.h
> index c4bd0e2c173c..772c784ba763 100644
> --- a/include/asm-generic/vmlinux.lds.h
> +++ b/include/asm-generic/vmlinux.lds.h
> @@ -256,6 +256,7 @@
>   .rodata           : AT(ADDR(.rodata) - LOAD_OFFSET) {		\
>    VMLINUX_SYMBOL(__start_rodata) = .;			\
>    *(.rodata) *(.rodata.*)					\
> +		*(.data..ro_after_init)	/* Read only after init */	\
   ^^^^^^^^^^^
looks like it's tabs vs. spaces...

> +/*
> + * __read_only is used to mark things that are read-only after init (i.e.
      ^^^^^^^^^^^
i know you liked the old name but probably this one needs to change too :P

> + * after mark_rodata_ro() has been called). These are effectively read-only,
> + * but may get written to during init, so can't live in .rodata (via "const").
> + */
> +#ifndef __ro_after_init
> +#define __ro_after_init __attribute__((__section__(".data..ro_after_init")))
> +#endif


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