linux-kernel - [tip:x86/pat] x86, PAT, PCI: Change vma prot in pci

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Message-ID: <tip-9cdec049389ce2c324fd1ec508a71528a27d4a07@git.kernel.org>
Date:	Tue, 24 Mar 2009 09:45:32 GMT
From:	"Pallipadi, Venkatesh" <venkatesh.pallipadi@...el.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...hat.com,
	venkatesh.pallipadi@...el.com, jbarnes@...tuousgeek.org,
	stable@...nel.org, kjwinchester@...il.com,
	suresh.b.siddha@...el.com, airlied@...hat.com, tglx@...utronix.de,
	mingo@...e.hu
Subject: [tip:x86/pat] x86, PAT, PCI: Change vma prot in pci_mmap to reflect inherited prot

Commit-ID:  9cdec049389ce2c324fd1ec508a71528a27d4a07
Gitweb:     http://git.kernel.org/tip/9cdec049389ce2c324fd1ec508a71528a27d4a07
Author:     Pallipadi, Venkatesh <venkatesh.pallipadi@...el.com>
AuthorDate: Mon, 23 Mar 2009 12:07:20 -0700
Committer:  Ingo Molnar <mingo@...e.hu>
CommitDate: Tue, 24 Mar 2009 10:42:35 +0100

x86, PAT, PCI: Change vma prot in pci_mmap to reflect inherited prot

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@...il.com>
Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@...el.com>
Signed-off-by: Suresh Siddha <suresh.b.siddha@...el.com>
Cc: Jesse Barnes <jbarnes@...tuousgeek.org>
Cc: Dave Airlie <airlied@...hat.com>
Cc: <stable@...nel.org>
LKML-Reference: <20090323190720.GA16831@...ux-os.sc.intel.com>
Signed-off-by: Ingo Molnar <mingo@...e.hu>


---
 arch/x86/pci/i386.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/arch/x86/pci/i386.c b/arch/x86/pci/i386.c
index 5ead808..f234a37 100644
--- a/arch/x86/pci/i386.c
+++ b/arch/x86/pci/i386.c
@@ -319,6 +319,9 @@ int pci_mmap_page_range(struct pci_dev *dev, struct vm_area_struct *vma,
 			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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