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List: linux-kernel
Subject: [patch 36/45] x86, PAT, PCI: Change vma prot in pci_mmap to reflect inherited prot
From: Chris Wright <chrisw () sous-sol ! org>
Date: 2009-03-31 23:11:21
Message-ID: 20090331231724.678240580 () sous-sol ! org
[Download RAW message or body]
-stable review patch. If anyone has any objections, please let us know.
---------------------
From: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
upstream commit: 9cdec049389ce2c324fd1ec508a71528a27d4a07
While looking at the issue in the thread:
http://marc.info/?l=dri-devel&m=123606627824556&w=2
noticed a bug in pci PAT code and memory type setting.
PCI mmap code did not set the proper protection in vma, when it
inherited protection in reserve_memtype. This bug only affects
the case where there exists a WC mapping before X does an mmap
with /proc or /sys pci interface. This will cause X userlevel
mmap from /proc or /sysfs to fail on fork.
Reported-by: Kevin Winchester <kjwinchester@gmail.com>
Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com>
Cc: Jesse Barnes <jbarnes@virtuousgeek.org>
Cc: Dave Airlie <airlied@redhat.com>
Cc: <stable@kernel.org>
LKML-Reference: <20090323190720.GA16831@linux-os.sc.intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Chris Wright <chrisw@sous-sol.org>
---
arch/x86/pci/i386.c | 3 +++
1 file changed, 3 insertions(+)
--- a/arch/x86/pci/i386.c
+++ b/arch/x86/pci/i386.c
@@ -319,6 +319,9 @@ int pci_mmap_page_range(struct pci_dev *
return -EINVAL;
}
flags = new_flags;
+ vma->vm_page_prot = __pgprot(
+ (pgprot_val(vma->vm_page_prot) & ~_PAGE_CACHE_MASK) |
+ flags);
}
if (((vma->vm_pgoff < max_low_pfn_mapped) ||
--
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