10:44 a.m.
Signed-off-by: Cole Robinson <crobinso(a)redhat.com>
---
src/util/pci.c | 12 +++++++++++-
1 files changed, 11 insertions(+), 1 deletions(-)
diff --git a/src/util/pci.c b/src/util/pci.c
index 81193b7..e1e11bc 100644
--- a/src/util/pci.c
+++ b/src/util/pci.c
@@ -1028,6 +1028,7 @@ pciGetDevice(unsigned domain,
unsigned function)
{
pciDevice *dev;
+ char devdir[PATH_MAX];
char *vendor, *product;
if (VIR_ALLOC(dev) < 0) {
@@ -1043,8 +1044,17 @@ pciGetDevice(unsigned domain,
snprintf(dev->name, sizeof(dev->name), "%.4x:%.2x:%.2x.%.1x",
dev->domain, dev->bus, dev->slot, dev->function);
+ snprintf(devdir, sizeof(devdir),
+ PCI_SYSFS "devices/%s", dev->name);
snprintf(dev->path, sizeof(dev->path),
- PCI_SYSFS "devices/%s/config", dev->name);
+ "%s/%s/config", devdir, dev->name);
+
+ if (access(devdir, X_OK) != 0) {
+ pciReportError(VIR_ERR_INTERNAL_ERROR,
+ _("Device %s not found"), dev->name);
+ pciFreeDevice(dev);
+ return NULL;
+ }
vendor = pciReadDeviceID(dev, "vendor");
product = pciReadDeviceID(dev, "device");
--
1.7.0.1
4:07 p.m.
On 04/30/2010 09:44 AM, Cole Robinson wrote:
@@ -1028,6 +1028,7 @@ pciGetDevice(unsigned domain,
unsigned function)
{
pciDevice *dev;
+ char devdir[PATH_MAX];
Using PATH_MAX as an array size is dangerous; it fails on GNU Hurd where
there is no minimum size. Also, it wastes a lot of space, given your
usage...
char *vendor, *product;
if (VIR_ALLOC(dev) < 0) {
@@ -1043,8 +1044,17 @@ pciGetDevice(unsigned domain,
snprintf(dev->name, sizeof(dev->name), "%.4x:%.2x:%.2x.%.1x",
dev->domain, dev->bus, dev->slot, dev->function);
+ snprintf(devdir, sizeof(devdir),
+ PCI_SYSFS "devices/%s", dev->name);
...here, of concatenating two relatively short strings. I'd almost
rather see a virAsprintf/free.
snprintf(dev->path, sizeof(dev->path),
- PCI_SYSFS "devices/%s/config", dev->name);
+ "%s/%s/config", devdir, dev->name);
+
+ if (access(devdir, X_OK) != 0) {
Is this ever run in a situation where the effective id might not equal
the user id (that is, as a setuid script, or as root)? If so, would it
be better to use faccessat(...,AT_EACCESS) instead of access() to be
querying the correct permissions? (Gnulib provides faccessat for all
platforms).
--
Eric Blake eblake(a)redhat.com +1-801-349-2682
Libvirt virtualization library http://libvirt.org
12:04 p.m.
On 05/04/2010 05:07 PM, Eric Blake wrote:
On 04/30/2010 09:44 AM, Cole Robinson wrote:
> @@ -1028,6 +1028,7 @@ pciGetDevice(unsigned domain,
> unsigned function)
> {
> pciDevice *dev;
> + char devdir[PATH_MAX];
Using PATH_MAX as an array size is dangerous; it fails on GNU Hurd where
there is no minimum size. Also, it wastes a lot of space, given your
usage...
> char *vendor, *product;
>
> if (VIR_ALLOC(dev) < 0) {
> @@ -1043,8 +1044,17 @@ pciGetDevice(unsigned domain,
>
> snprintf(dev->name, sizeof(dev->name), "%.4x:%.2x:%.2x.%.1x",
> dev->domain, dev->bus, dev->slot, dev->function);
> + snprintf(devdir, sizeof(devdir),
> + PCI_SYSFS "devices/%s", dev->name);
...here, of concatenating two relatively short strings. I'd almost
rather see a virAsprintf/free.
> snprintf(dev->path, sizeof(dev->path),
> - PCI_SYSFS "devices/%s/config", dev->name);
> + "%s/%s/config", devdir, dev->name);
> +
> + if (access(devdir, X_OK) != 0) {
Is this ever run in a situation where the effective id might not equal
the user id (that is, as a setuid script, or as root)? If so, would it
be better to use faccessat(...,AT_EACCESS) instead of access() to be
querying the correct permissions? (Gnulib provides faccessat for all
platforms).
Actually, my code was wrong, I just wanted to test for the existence of
the file with F_OK, so sounds like faccessat isn't what I want in that
case. I'm sending an updated patch which is also much simpler, and just
checks dev->path rather than using a new variable.
Thanks,
Cole
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Cole Robinson -
Eric Blake