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authorJean Delvare <khali@linux-fr.org>2007-04-07 17:21:28 +0200
committerGreg Kroah-Hartman <gregkh@suse.de>2007-05-02 19:02:35 -0700
commit6ba186361ed2cda7e174856a3ab8a8e3237b3c3d (patch)
tree97fe2b10ee8f11b914ea891a3872c4da4f542a6d
parent40ee9e9f8d52d85f2446bbdda7823a3f1de62f3f (diff)
downloadop-kernel-dev-6ba186361ed2cda7e174856a3ab8a8e3237b3c3d.zip
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PCI: Require vendor and device for new_id
Currently, there is no minimum number of fields required when adding a new device ID to a PCI driver through the new_id sysfs file. It is possible to add a new ID with only the vendor ID set, causing the driver to attempt to attach to all PCI devices from that vendor. This has been reported to happen accidentally: http://lists.lm-sensors.org/pipermail/lm-sensors/2007-March/019366.html It is even possible to not even set the vendor ID field, causing the driver to attempt to attach to _all_ the PCI devices. This sounds dangerous and I fail to see any valid use of this "feature". Thus I suggest that we now require at least the first two fields (vendor ID and device ID) to be set. For what it's worth, this is what the USB subsystem does. Signed-off-by: Jean Delvare <khali@linux-fr.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
-rw-r--r--Documentation/pci.txt6
-rw-r--r--drivers/pci/pci-driver.c4
2 files changed, 5 insertions, 5 deletions
diff --git a/Documentation/pci.txt b/Documentation/pci.txt
index cdf2f3c..a8ded1a 100644
--- a/Documentation/pci.txt
+++ b/Documentation/pci.txt
@@ -163,9 +163,9 @@ echo "vendor device subvendor subdevice class class_mask driver_data" > \
/sys/bus/pci/drivers/{driver}/new_id
All fields are passed in as hexadecimal values (no leading 0x).
-Users need pass only as many fields as necessary:
- o vendor, device, subvendor, and subdevice fields default
- to PCI_ANY_ID (FFFFFFFF),
+The vendor and device fields are mandatory, the others are optional. Users
+need pass only as many optional fields as necessary:
+ o subvendor and subdevice fields default to PCI_ANY_ID (FFFFFFFF)
o class and classmask fields default to 0
o driver_data defaults to 0UL.
diff --git a/drivers/pci/pci-driver.c b/drivers/pci/pci-driver.c
index 39e80fc..07fdb3c 100644
--- a/drivers/pci/pci-driver.c
+++ b/drivers/pci/pci-driver.c
@@ -52,7 +52,7 @@ store_new_id(struct device_driver *driver, const char *buf, size_t count)
{
struct pci_dynid *dynid;
struct pci_driver *pdrv = to_pci_driver(driver);
- __u32 vendor=PCI_ANY_ID, device=PCI_ANY_ID, subvendor=PCI_ANY_ID,
+ __u32 vendor, device, subvendor=PCI_ANY_ID,
subdevice=PCI_ANY_ID, class=0, class_mask=0;
unsigned long driver_data=0;
int fields=0;
@@ -61,7 +61,7 @@ store_new_id(struct device_driver *driver, const char *buf, size_t count)
fields = sscanf(buf, "%x %x %x %x %x %x %lux",
&vendor, &device, &subvendor, &subdevice,
&class, &class_mask, &driver_data);
- if (fields < 0)
+ if (fields < 2)
return -EINVAL;
dynid = kzalloc(sizeof(*dynid), GFP_KERNEL);
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