linux-kernel - [PATCH 02/17] pci: Fix another sanity check bug in /proc/pci mmap

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Message-Id: <ab313a676468ed1e372cd1a41cea57dad3860ca1.1490188942.git.dwmw2@infradead.org>
Date:   Wed, 22 Mar 2017 13:25:16 +0000
From:   David Woodhouse <dwmw2@...radead.org>
To:     linux-pci@...r.kernel.org, linux-arch@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH 02/17] pci: Fix another sanity check bug in /proc/pci mmap

From: David Woodhouse <dwmw@...zon.co.uk>

Don't match MMIO maps with I/O BARs and vice versa.

Signed-off-by: David Woodhouse <dwmw@...zon.co.uk>
Cc: stable@...r.kernel.org
---
 drivers/pci/proc.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/drivers/pci/proc.c b/drivers/pci/proc.c
index f82710a..62a0c3e 100644
--- a/drivers/pci/proc.c
+++ b/drivers/pci/proc.c
@@ -231,14 +231,20 @@ static int proc_bus_pci_mmap(struct file *file, struct vm_area_struct *vma)
 {
 	struct pci_dev *dev = PDE_DATA(file_inode(file));
 	struct pci_filp_private *fpriv = file->private_data;
-	int i, ret, write_combine;
+	int i, ret, write_combine, res_bit;
 
 	if (!capable(CAP_SYS_RAWIO))
 		return -EPERM;
 
+	if (fpriv->mmap_state == pci_mmap_io)
+		res_bit = IORESOURCE_IO;
+	else
+		res_bit = IORESOURCE_MEM;
+
 	/* Make sure the caller is mapping a real resource for this device */
 	for (i = 0; i < PCI_ROM_RESOURCE; i++) {
-		if (pci_mmap_fits(dev, i, vma,  PCI_MMAP_PROCFS))
+		if (dev->resource[i].flags & res_bit &&
+		    pci_mmap_fits(dev, i, vma,  PCI_MMAP_PROCFS))
 			break;
 	}
 
-- 
2.9.3