linux-kernel - Re: Regression - Xorg start failed

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Date:	Sun, 13 Feb 2011 16:35:31 -0800
From:	Chris Wright <chrisw@...s-sol.org>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Dave Airlie <airlied@...il.com>,
	Dave Young <hidave.darkstar@...il.com>,
	linux-kernel@...r.kernel.org, David Airlie <airlied@...ux.ie>,
	dri-devel@...ts.freedesktop.org,
	Chris Wright <chrisw@...s-sol.org>,
	James Morris <jmorris@...ei.org>
Subject: Re: Regression - Xorg start failed

* Linus Torvalds (torvalds@...ux-foundation.org) wrote:
> On Sat, Feb 12, 2011 at 11:53 PM, Dave Airlie <airlied@...il.com> wrote:
> > Probably should revert first, then work out what is crapping out libpciaccess.
> 
> Yeah, I'll revert. The patch is one of those "obviously a good idea,
> but in practice it's not something we can change now".

Turns out I'm just a bona fide idiot.

I was not testing the right kernel _and_ didn't get the logic right.

sorry for the screw up,
-chris
---

Subject: [PATCH] pci: use security_capable correctly during config space read

Commit 47970b1 ("pci: use security_capable() when checking capablities
during config space read") is just plain broken.  The normal capable()
interface returns true on success, but the LSM interface returns 0 on
success.

Signed-off-by: Chris Wright <chrisw@...s-sol.org>
---

I've tested this quickly (lspci behaviour is as expected).

diff --git a/drivers/pci/pci-sysfs.c b/drivers/pci/pci-sysfs.c
index f7771f3..ea25e5b 100644
--- a/drivers/pci/pci-sysfs.c
+++ b/drivers/pci/pci-sysfs.c
@@ -369,7 +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 (security_capable(filp->f_cred, 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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