diff options
authorChris Wright <>2011-02-14 17:21:49 -0800
committerJames Morris <>2011-02-15 19:06:31 +1100
commita628e7b87e100befac9702aa0c3b9848a7685e49 (patch)
parent795abaf1e4e188c4171e3cd3dbb11a9fcacaf505 (diff)
pci: use security_capable() when checking capablities during config space read
This reintroduces commit 47970b1b which was subsequently reverted as f00eaeea. The original change was broken and caused X startup failures and generally made privileged processes incapable of reading device dependent config space. The normal capable() interface returns true on success, but the LSM interface returns 0 on success. This thinko is now fixed in this patch, and has been confirmed to work properly. So, once again...Eric Paris noted that commit de139a3 ("pci: check caps from sysfs file open to read device dependent config space") caused the capability check to bypass security modules and potentially auditing. Rectify this by calling security_capable() when checking the open file's capabilities for config space reads. Reported-by: Eric Paris <> Tested-by: Dave Young <> Acked-by: James Morris <> Cc: Dave Airlie <> Cc: Alex Riesen <> Cc: Sedat Dilek <> Cc: Linus Torvalds <> Signed-off-by: Chris Wright <> Signed-off-by: James Morris <>
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/pci/pci-sysfs.c b/drivers/pci/pci-sysfs.c
index 8ecaac983923..ea25e5bfcf23 100644
--- a/drivers/pci/pci-sysfs.c
+++ b/drivers/pci/pci-sysfs.c
@@ -23,6 +23,7 @@
#include <linux/mm.h>
#include <linux/fs.h>
#include <linux/capability.h>
+#include <linux/security.h>
#include <linux/pci-aspm.h>
#include <linux/slab.h>
#include "pci.h"
@@ -368,7 +369,7 @@ pci_read_config(struct file *filp, struct kobject *kobj,
u8 *data = (u8*) buf;
/* Several chips lock up trying to read undefined config space */
- if (cap_raised(filp->f_cred->cap_effective, CAP_SYS_ADMIN)) {
+ if (security_capable(filp->f_cred, CAP_SYS_ADMIN) == 0) {
size = dev->cfg_size;
} else if (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS) {
size = 128;