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Message-ID: <20151122035702.9313.52457.stgit@dwillia2-desk3.jf.intel.com> Date: Sat, 21 Nov 2015 19:57:02 -0800 From: Dan Williams <dan.j.williams@...el.com> To: linux-kernel@...r.kernel.org Cc: linux-arch@...r.kernel.org, Russell King <linux@....linux.org.uk>, Kees Cook <keescook@...omium.org>, Arnd Bergmann <arnd@...db.de>, Greg Kroah-Hartman <gregkh@...uxfoundation.org>, Catalin Marinas <catalin.marinas@....com>, linux-nvdimm@...ts.01.org, Heiko Carstens <heiko.carstens@...ibm.com>, Andrew Morton <akpm@...ux-foundation.org>, Will Deacon <will.deacon@....com>, Ingo Molnar <mingo@...hat.com>, Benjamin Herrenschmidt <benh@...nel.crashing.org>, "H. Peter Anvin" <hpa@...or.com>, Martin Schwidefsky <schwidefsky@...ibm.com>, Thomas Gleixner <tglx@...utronix.de>, "David S. Miller" <davem@...emloft.net>, linux-arm-kernel@...ts.infradead.org Subject: [PATCH 1/2] arch: consolidate CONFIG_STRICT_DEVM in lib/Kconfig.debug Let all the archs that implement CONFIG_STRICT_DEVM use a common definition in lib/Kconfig.debug. Note, the 'depends on !SPARC' is due to sparc not implementing devmem_is_allowed(). Cc: Kees Cook <keescook@...omium.org> Cc: Russell King <linux@....linux.org.uk> Cc: Catalin Marinas <catalin.marinas@....com> Cc: Will Deacon <will.deacon@....com> Cc: Benjamin Herrenschmidt <benh@...nel.crashing.org> Cc: Martin Schwidefsky <schwidefsky@...ibm.com> Cc: Heiko Carstens <heiko.carstens@...ibm.com> Cc: Thomas Gleixner <tglx@...utronix.de> Cc: Ingo Molnar <mingo@...hat.com> Cc: "H. Peter Anvin" <hpa@...or.com> Cc: Andrew Morton <akpm@...ux-foundation.org> Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org> Cc: "David S. Miller" <davem@...emloft.net> Suggested-by: Arnd Bergmann <arnd@...db.de> Signed-off-by: Dan Williams <dan.j.williams@...el.com> --- arch/arm/Kconfig.debug | 14 -------------- arch/arm64/Kconfig.debug | 14 -------------- arch/powerpc/Kconfig.debug | 12 ------------ arch/s390/Kconfig.debug | 12 ------------ arch/tile/Kconfig | 3 --- arch/unicore32/Kconfig.debug | 14 -------------- arch/x86/Kconfig.debug | 17 ----------------- lib/Kconfig.debug | 19 +++++++++++++++++++ 8 files changed, 19 insertions(+), 86 deletions(-) diff --git a/arch/arm/Kconfig.debug b/arch/arm/Kconfig.debug index 259c0ca9c99a..e356357d86bb 100644 --- a/arch/arm/Kconfig.debug +++ b/arch/arm/Kconfig.debug @@ -15,20 +15,6 @@ config ARM_PTDUMP kernel. If in doubt, say "N" -config STRICT_DEVMEM - bool "Filter access to /dev/mem" - depends on MMU - ---help--- - If this option is disabled, you allow userspace (root) access to all - of memory, including kernel and userspace memory. Accidental - access to this is obviously disastrous, but specific access can - be used by people debugging the kernel. - - If this option is switched on, the /dev/mem file only allows - userspace access to memory mapped peripherals. - - If in doubt, say Y. - # RMK wants arm kernels compiled with frame pointers or stack unwinding. # If you know what you are doing and are willing to live without stack # traces, you can get a slightly smaller kernel by setting this option to diff --git a/arch/arm64/Kconfig.debug b/arch/arm64/Kconfig.debug index 04fb73b973f1..e13c4bf84d9e 100644 --- a/arch/arm64/Kconfig.debug +++ b/arch/arm64/Kconfig.debug @@ -14,20 +14,6 @@ config ARM64_PTDUMP kernel. If in doubt, say "N" -config STRICT_DEVMEM - bool "Filter access to /dev/mem" - depends on MMU - help - If this option is disabled, you allow userspace (root) access to all - of memory, including kernel and userspace memory. Accidental - access to this is obviously disastrous, but specific access can - be used by people debugging the kernel. - - If this option is switched on, the /dev/mem file only allows - userspace access to memory mapped peripherals. - - If in doubt, say Y. - config PID_IN_CONTEXTIDR bool "Write the current PID to the CONTEXTIDR register" help diff --git a/arch/powerpc/Kconfig.debug b/arch/powerpc/Kconfig.debug index 3a510f4a6b68..a0e44a9c456f 100644 --- a/arch/powerpc/Kconfig.debug +++ b/arch/powerpc/Kconfig.debug @@ -335,18 +335,6 @@ config PPC_EARLY_DEBUG_CPM_ADDR platform probing is done, all platforms selected must share the same address. -config STRICT_DEVMEM - def_bool y - prompt "Filter access to /dev/mem" - help - This option restricts access to /dev/mem. If this option is - disabled, you allow userspace access to all memory, including - kernel and userspace memory. Accidental memory access is likely - to be disastrous. - Memory access is required for experts who want to debug the kernel. - - If you are unsure, say Y. - config FAIL_IOMMU bool "Fault-injection capability for IOMMU" depends on FAULT_INJECTION diff --git a/arch/s390/Kconfig.debug b/arch/s390/Kconfig.debug index c56878e1245f..26c5d5beb4be 100644 --- a/arch/s390/Kconfig.debug +++ b/arch/s390/Kconfig.debug @@ -5,18 +5,6 @@ config TRACE_IRQFLAGS_SUPPORT source "lib/Kconfig.debug" -config STRICT_DEVMEM - def_bool y - prompt "Filter access to /dev/mem" - ---help--- - This option restricts access to /dev/mem. If this option is - disabled, you allow userspace access to all memory, including - kernel and userspace memory. Accidental memory access is likely - to be disastrous. - Memory access is required for experts who want to debug the kernel. - - If you are unsure, say Y. - config S390_PTDUMP bool "Export kernel pagetable layout to userspace via debugfs" depends on DEBUG_KERNEL diff --git a/arch/tile/Kconfig b/arch/tile/Kconfig index 106c21bd7f44..7b2d40db11fa 100644 --- a/arch/tile/Kconfig +++ b/arch/tile/Kconfig @@ -116,9 +116,6 @@ config ARCH_DISCONTIGMEM_DEFAULT config TRACE_IRQFLAGS_SUPPORT def_bool y -config STRICT_DEVMEM - def_bool y - # SMP is required for Tilera Linux. config SMP def_bool y diff --git a/arch/unicore32/Kconfig.debug b/arch/unicore32/Kconfig.debug index 1a3626239843..f075bbe1d46f 100644 --- a/arch/unicore32/Kconfig.debug +++ b/arch/unicore32/Kconfig.debug @@ -2,20 +2,6 @@ menu "Kernel hacking" source "lib/Kconfig.debug" -config STRICT_DEVMEM - bool "Filter access to /dev/mem" - depends on MMU - ---help--- - If this option is disabled, you allow userspace (root) access to all - of memory, including kernel and userspace memory. Accidental - access to this is obviously disastrous, but specific access can - be used by people debugging the kernel. - - If this option is switched on, the /dev/mem file only allows - userspace access to memory mapped peripherals. - - If in doubt, say Y. - config EARLY_PRINTK def_bool DEBUG_OCD help diff --git a/arch/x86/Kconfig.debug b/arch/x86/Kconfig.debug index 137dfa96aa14..1116452fcfc2 100644 --- a/arch/x86/Kconfig.debug +++ b/arch/x86/Kconfig.debug @@ -5,23 +5,6 @@ config TRACE_IRQFLAGS_SUPPORT source "lib/Kconfig.debug" -config STRICT_DEVMEM - bool "Filter access to /dev/mem" - ---help--- - If this option is disabled, you allow userspace (root) access to all - of memory, including kernel and userspace memory. Accidental - access to this is obviously disastrous, but specific access can - be used by people debugging the kernel. Note that with PAT support - enabled, even in this case there are restrictions on /dev/mem - use due to the cache aliasing requirements. - - If this option is switched on, the /dev/mem file only allows - userspace access to PCI space and the BIOS code and data regions. - This is sufficient for dosemu and X and all common users of - /dev/mem. - - If in doubt, say Y. - config X86_VERBOSE_BOOTUP bool "Enable verbose x86 bootup info messages" default y diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug index 8c15b29d5adc..ad85145d0047 100644 --- a/lib/Kconfig.debug +++ b/lib/Kconfig.debug @@ -1853,3 +1853,22 @@ source "samples/Kconfig" source "lib/Kconfig.kgdb" +config STRICT_DEVMEM + bool "Filter access to /dev/mem" + depends on MMU + depends on !SPARC + default y if TILE || PPC || S390 + ---help--- + If this option is disabled, you allow userspace (root) access to all + of memory, including kernel and userspace memory. Accidental + access to this is obviously disastrous, but specific access can + be used by people debugging the kernel. Note that with PAT support + enabled, even in this case there are restrictions on /dev/mem + use due to the cache aliasing requirements. + + If this option is switched on, the /dev/mem file only allows + userspace access to PCI space and the BIOS code and data regions. + This is sufficient for dosemu and X and all common users of + /dev/mem. + + If in doubt, say Y. -- 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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