Re: [1/2] 2.6.22-rc5: known regressions with patches

Stefan Richter
2007-06-21T14:35:27Z

Arjan van de Ven wrote:
> --- linux-2.6.22-rc5/arch/i386/Kconfig.debug.org 2007-06-20 22:20:30.000000000 -0700
> +++ linux-2.6.22-rc5/arch/i386/Kconfig.debug 2007-06-20 22:20:55.000000000 -0700
> @@ -49,7 +49,6 @@ config DEBUG_PAGEALLOC
> config DEBUG_RODATA
> bool "Write protect kernel read-only data structures"
> depends on DEBUG_KERNEL
> - depends on !KPROBES # temporary for 2.6.22
> help
> Mark the kernel read-only data as write-protected in the pagetables,
> in order to catch accidental (and incorrect) writes to such const
> --- linux-2.6.22-rc5/arch/x86_64/Kconfig.debug.org 2007-06-20 22:20:28.000000000 -0700
> +++ linux-2.6.22-rc5/arch/x86_64/Kconfig.debug 2007-06-20 22:20:44.000000000 -0700
> @@ -9,7 +9,6 @@ source "lib/Kconfig.debug"
> config DEBUG_RODATA
> bool "Write protect kernel read-only data structures"
> depends on DEBUG_KERNEL
> - depends on !KPROBES # temporary for 2.6.22
> help
> Mark the kernel read-only data as write-protected in the pagetables,
> in order to catch accidental (and incorrect) writes to such const data.

Shouldn't we add something to the help texts?

+ This option also marks kernel text pages as write-protected,
+ except if you enable KPROBES.

CMIIW.

As mentioned elsewhere in this thread, replacing CONFIG_DEBUG_RODATA by
CONFIG_WRITEPROTECT_RODATA and CONFIG_WRITEPROTECT_TEXT might be a
better idea. The latter should be mutual exclusive with CONFIG_KPROBES.
--
Stefan Richter
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