From: Lennert Buytenhek <buytenh@wantstofly.org>
Date: Mon, 10 Jul 2006 11:45:27 +0000 (-0700)
Subject: [PATCH] make valid_mmap_phys_addr_range() take a pfn
X-Git-Tag: v2.6.18-rc2~144
X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=06c67befeeb16f2995c11b0e04a348103ddbfab1;p=linux-2.6

[PATCH] make valid_mmap_phys_addr_range() take a pfn

Newer ARMs have a 40 bit physical address space, but mapping physical
memory above 4G needs a special page table format which we (currently?) do
not use for userspace mappings, so what happens instead is that mapping an
address >= 4G will happily discard the upper bits and wrap.

There is a valid_mmap_phys_addr_range() arch hook where we could check for
>= 4G addresses and deny the mapping, but this hook takes an unsigned long
address:

	static inline int valid_mmap_phys_addr_range(unsigned long addr, size_t size);

And drivers/char/mem.c:mmap_mem() calls it like this:

	static int mmap_mem(struct file * file, struct vm_area_struct * vma)
	{
		size_t size = vma->vm_end - vma->vm_start;

		if (!valid_mmap_phys_addr_range(vma->vm_pgoff << PAGE_SHIFT, size))

So that's not much help either.

This patch makes the hook take a pfn instead of a phys address.

Signed-off-by: Lennert Buytenhek <buytenh@wantstofly.org>
Cc: Bjorn Helgaas <bjorn.helgaas@hp.com>
Cc: "Luck, Tony" <tony.luck@intel.com>
Cc: Russell King <rmk@arm.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---

diff --git a/arch/ia64/kernel/efi.c b/arch/ia64/kernel/efi.c
index b13c0555c3..e4bfa9dafb 100644
--- a/arch/ia64/kernel/efi.c
+++ b/arch/ia64/kernel/efi.c
@@ -759,7 +759,7 @@ valid_phys_addr_range (unsigned long phys_addr, unsigned long size)
 }
 
 int
-valid_mmap_phys_addr_range (unsigned long phys_addr, unsigned long size)
+valid_mmap_phys_addr_range (unsigned long pfn, unsigned long size)
 {
 	/*
 	 * MMIO regions are often missing from the EFI memory map.
diff --git a/arch/ia64/pci/pci.c b/arch/ia64/pci/pci.c
index 276512fd89..60b45e79f0 100644
--- a/arch/ia64/pci/pci.c
+++ b/arch/ia64/pci/pci.c
@@ -650,7 +650,7 @@ pci_mmap_legacy_page_range(struct pci_bus *bus, struct vm_area_struct *vma)
 	 * Avoid attribute aliasing.  See Documentation/ia64/aliasing.txt
 	 * for more details.
 	 */
-	if (!valid_mmap_phys_addr_range(vma->vm_pgoff << PAGE_SHIFT, size))
+	if (!valid_mmap_phys_addr_range(vma->vm_pgoff, size))
 		return -EINVAL;
 	prot = phys_mem_access_prot(NULL, vma->vm_pgoff, size,
 				    vma->vm_page_prot);
diff --git a/drivers/char/mem.c b/drivers/char/mem.c
index e97c32ceb7..917b204026 100644
--- a/drivers/char/mem.c
+++ b/drivers/char/mem.c
@@ -95,7 +95,7 @@ static inline int valid_phys_addr_range(unsigned long addr, size_t count)
 	return 1;
 }
 
-static inline int valid_mmap_phys_addr_range(unsigned long addr, size_t size)
+static inline int valid_mmap_phys_addr_range(unsigned long pfn, size_t size)
 {
 	return 1;
 }
@@ -242,7 +242,7 @@ static int mmap_mem(struct file * file, struct vm_area_struct * vma)
 {
 	size_t size = vma->vm_end - vma->vm_start;
 
-	if (!valid_mmap_phys_addr_range(vma->vm_pgoff << PAGE_SHIFT, size))
+	if (!valid_mmap_phys_addr_range(vma->vm_pgoff, size))
 		return -EINVAL;
 
 	vma->vm_page_prot = phys_mem_access_prot(file, vma->vm_pgoff,
diff --git a/include/asm-ia64/io.h b/include/asm-ia64/io.h
index 781ee2c7e8..43bfff6c6b 100644
--- a/include/asm-ia64/io.h
+++ b/include/asm-ia64/io.h
@@ -90,7 +90,7 @@ phys_to_virt (unsigned long address)
 #define ARCH_HAS_VALID_PHYS_ADDR_RANGE
 extern u64 kern_mem_attribute (unsigned long phys_addr, unsigned long size);
 extern int valid_phys_addr_range (unsigned long addr, size_t count); /* efi.c */
-extern int valid_mmap_phys_addr_range (unsigned long addr, size_t count);
+extern int valid_mmap_phys_addr_range (unsigned long pfn, size_t count);
 
 /*
  * The following two macros are deprecated and scheduled for removal.