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authorLennert Buytenhek <buytenh@wantstofly.org>2006-09-16 10:50:22 +0100
committerRussell King <rmk+kernel@arm.linux.org.uk>2006-09-25 10:25:26 +0100
commit51635ad282ead58b9d164f07e1fb62a9456b427c (patch)
treea7d9fb162d09aaf02da3dee89520b10c07d92c8b
parentbf11d26cb96fe8221ef056eedab692e91634cc65 (diff)
downloadop-kernel-dev-51635ad282ead58b9d164f07e1fb62a9456b427c.zip
op-kernel-dev-51635ad282ead58b9d164f07e1fb62a9456b427c.tar.gz
[ARM] 3813/1: prevent >= 4G /dev/mem mmap()
Prevent userland from mapping in physical address regions >= 4G by checking for that in valid_mmap_phys_addr_range(). Unfortunately, we cannot override valid_mmap_phys_addr_range() without also overriding valid_phys_addr_range(), so copy drivers/char/mem.c's version of valid_phys_addr_range() over to arch/arm/mm/mmap.c as well. Signed-off-by: Lennert Buytenhek <buytenh@wantstofly.org> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
-rw-r--r--arch/arm/mm/mmap.c22
-rw-r--r--include/asm-arm/io.h4
2 files changed, 26 insertions, 0 deletions
diff --git a/arch/arm/mm/mmap.c b/arch/arm/mm/mmap.c
index 29e5480..b0b5f46 100644
--- a/arch/arm/mm/mmap.c
+++ b/arch/arm/mm/mmap.c
@@ -114,3 +114,25 @@ full_search:
}
}
+
+/*
+ * You really shouldn't be using read() or write() on /dev/mem. This
+ * might go away in the future.
+ */
+int valid_phys_addr_range(unsigned long addr, size_t size)
+{
+ if (addr + size > __pa(high_memory))
+ return 0;
+
+ return 1;
+}
+
+/*
+ * We don't use supersection mappings for mmap() on /dev/mem, which
+ * means that we can't map the memory area above the 4G barrier into
+ * userspace.
+ */
+int valid_mmap_phys_addr_range(unsigned long pfn, size_t size)
+{
+ return !(pfn + (size >> PAGE_SHIFT) > 0x00100000);
+}
diff --git a/include/asm-arm/io.h b/include/asm-arm/io.h
index bf7b9de..8076a85 100644
--- a/include/asm-arm/io.h
+++ b/include/asm-arm/io.h
@@ -280,6 +280,10 @@ extern void pci_iounmap(struct pci_dev *dev, void __iomem *addr);
#define BIOVEC_MERGEABLE(vec1, vec2) \
((bvec_to_phys((vec1)) + (vec1)->bv_len) == bvec_to_phys((vec2)))
+#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);
+
/*
* Convert a physical pointer to a virtual kernel pointer for /dev/mem
* access
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