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ARM: implement CONFIG_STRICT_DEVMEM by disabling access to RAM via /dev/mem

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There are very few legitimate use cases, if any, for directly accessing
system RAM through /dev/mem.  So let's mimic what they do on x86 and
forbid it when CONFIG_STRICT_DEVMEM is turned on.

Signed-off-by: Nicolas Pitre <nicolas.pitre@linaro.org>
This commit is contained in:
Nicolas Pitre
2010-09-22 18:34:36 -04:00
committed by Nicolas Pitre
parent 7c63984b86
commit 087aaffcdf
3 changed files with 37 additions and 0 deletions
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arch/arm/include/asm/io.h
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@ -294,6 +294,7 @@ extern void pci_iounmap(struct pci_dev *dev, void __iomem *addr);
#define ARCH_HAS_VALID_PHYS_ADDR_RANGE
extern int valid_phys_addr_range(unsigned long addr, size_t size);
extern int valid_mmap_phys_addr_range(unsigned long pfn, size_t size);
extern int devmem_is_allowed(unsigned long pfn);
#endif
/*