linux-kernel - [30/70] pci: use security_capable() when checking capablities during config space read

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Date:	Tue, 22 Feb 2011 14:17:09 -0800
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	James Morris <jmorris@...ei.org>,
	Dave Airlie <airlied@...il.com>,
	Alex Riesen <raa.lkml@...il.com>,
	Sedat Dilek <sedat.dilek@...glemail.com>,
	Chris Wright <chrisw@...s-sol.org>
Subject: [30/70] pci: use security_capable() when checking capablities during config space read

2.6.37-stable review patch.  If anyone has any objections, please let us know.

------------------

From: Chris Wright <chrisw@...s-sol.org>

commit a628e7b87e100befac9702aa0c3b9848a7685e49 upstream.

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 <eparis@...hat.com>
Tested-by: Dave Young <hidave.darkstar@...il.com>
Acked-by: James Morris <jmorris@...ei.org>
Cc: Dave Airlie <airlied@...il.com>
Cc: Alex Riesen <raa.lkml@...il.com>
Cc: Sedat Dilek <sedat.dilek@...glemail.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Chris Wright <chrisw@...s-sol.org>
Signed-off-by: James Morris <jmorris@...ei.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 drivers/pci/pci-sysfs.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- 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, struc
 	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;


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