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[S390] mm: add devmem_is_allowed() for STRICT_DEVMEM checking
Provide the devmem_is_allowed() routine to restrict access to kernel memory from userspace. Set the CONFIG_STRICT_DEVMEM config option to switch on checking. Signed-off-by: Hendrik Brueckner <brueckner@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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@ -6,6 +6,18 @@ config TRACE_IRQFLAGS_SUPPORT
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source "lib/Kconfig.debug"
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config STRICT_DEVMEM
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def_bool y
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prompt "Filter access to /dev/mem"
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---help---
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This option restricts access to /dev/mem. If this option is
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disabled, you allow userspace access to all memory, including
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kernel and userspace memory. Accidental memory access is likely
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to be disastrous.
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Memory access is required for experts who want to debug the kernel.
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If you are unsure, say Y.
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config DEBUG_STRICT_USER_COPY_CHECKS
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bool "Strict user copy size checks"
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---help---
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@ -130,6 +130,11 @@ struct page;
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void arch_free_page(struct page *page, int order);
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void arch_alloc_page(struct page *page, int order);
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static inline int devmem_is_allowed(unsigned long pfn)
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{
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return 0;
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}
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#define HAVE_ARCH_FREE_PAGE
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#define HAVE_ARCH_ALLOC_PAGE
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