Re: [PATCH V3] x86: NX protection for kernel data

From: AmÃrico Wang
Date: Fri Sep 04 2009 - 05:37:51 EST

On Fri, Sep 4, 2009 at 9:13 AM, Siarhei Liakh<sliakh.lkml@xxxxxxxxx> wrote:
> This patch expands functionality of CONFIG_DEBUG_RODATA to set main
> (static) kernel data area as NX.
> The following steps are taken to achieve this:
> 1. Linker script is adjusted so .text always starts and ends on a page boundary
> 2. Linker script is adjusted so .rodata and .data always start and
> end on a page boundary
> 3. void mark_nxdata_nx(void) added to arch/x86/mm/init.c with actual
> functionality: NX is set for all pages from _etext through _end.
> 4. mark_nxdata_nx() called from free_initmem() (after init has been released)
> 5. free_init_pages() sets released memory NX in arch/x86/mm/init.c
> The patch have been developed for Linux 2.6.31-rc7 x86 by Siarhei Liakh
> <sliakh.lkml@xxxxxxxxx> and Xuxian Jiang <jiang@xxxxxxxxxxx>.
> V1: Âinitial patch for 2.6.30
> V2: Âpatch for 2.6.31-rc7
> V3: Âmoved all code into arch/x86, adjusted credits

Looks fine, but I don't think it is necessary to bother "CREDITS",
because now we have git. :)

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