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Date: Tue, 13 Apr 2010 10:52:28 +0800 From: wzt.wzt@...il.com To: linux-kernel@...r.kernel.org Cc: mingo@...hat.com, hpa@...or.com, x86@...nel.org, zippel@...ux-m68k.org Subject: [PATCH] Kconfig: Make config Filter access to /dev/mem default y Recently, most company start use >=2.6.31 kernels to replace redhat kernels. But the config "Filter access to /dev/mem" is "default n", that allows kernel rootkit using /dev/mem again. it could access all kernel memory default. Most administrator don't known the "Filter access to /dev/mem" is "defult N", when he compiles the kernel, it's easily to be attacked by rootkit. Signed-off-by: Zhitong Wang <zhitong.wangzt@...baba-inc.com> --- arch/x86/Kconfig.debug | 3 ++- arch/x86/configs/i386_defconfig | 2 +- arch/x86/configs/x86_64_defconfig | 2 +- 3 files changed, 4 insertions(+), 3 deletions(-) diff --git a/arch/x86/Kconfig.debug b/arch/x86/Kconfig.debug index bc01e3e..733aea6 100644 --- a/arch/x86/Kconfig.debug +++ b/arch/x86/Kconfig.debug @@ -7,6 +7,7 @@ source "lib/Kconfig.debug" config STRICT_DEVMEM bool "Filter access to /dev/mem" + default y ---help--- If this option is disabled, you allow userspace (root) access to all of memory, including kernel and userspace memory. Accidental @@ -20,7 +21,7 @@ config STRICT_DEVMEM This is sufficient for dosemu and X and all common users of /dev/mem. - If in doubt, say Y. + If in doubt, say N. config X86_VERBOSE_BOOTUP bool "Enable verbose x86 bootup info messages" diff --git a/arch/x86/configs/i386_defconfig b/arch/x86/configs/i386_defconfig index d28fad1..95c85a8 100644 --- a/arch/x86/configs/i386_defconfig +++ b/arch/x86/configs/i386_defconfig @@ -2386,7 +2386,7 @@ CONFIG_PROVIDE_OHCI1394_DMA_INIT=y # CONFIG_SAMPLES is not set CONFIG_HAVE_ARCH_KGDB=y # CONFIG_KGDB is not set -# CONFIG_STRICT_DEVMEM is not set +CONFIG_STRICT_DEVMEM=y CONFIG_X86_VERBOSE_BOOTUP=y CONFIG_EARLY_PRINTK=y CONFIG_EARLY_PRINTK_DBGP=y diff --git a/arch/x86/configs/x86_64_defconfig b/arch/x86/configs/x86_64_defconfig index 6c86acd..659bfe7 100644 --- a/arch/x86/configs/x86_64_defconfig +++ b/arch/x86/configs/x86_64_defconfig @@ -2360,7 +2360,7 @@ CONFIG_PROVIDE_OHCI1394_DMA_INIT=y # CONFIG_SAMPLES is not set CONFIG_HAVE_ARCH_KGDB=y # CONFIG_KGDB is not set -# CONFIG_STRICT_DEVMEM is not set +CONFIG_STRICT_DEVMEM=y CONFIG_X86_VERBOSE_BOOTUP=y CONFIG_EARLY_PRINTK=y CONFIG_EARLY_PRINTK_DBGP=y -- 1.6.5.3 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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