linux-kernel - [RFC v6 02/10] PCI: Do not Use IORESOURCE_STARTALIGN to identify bridge resources

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <1460976961-29328-2-git-send-email-xyjxie@linux.vnet.ibm.com>
Date:	Mon, 18 Apr 2016 18:55:58 +0800
From:	Yongji Xie <xyjxie@...ux.vnet.ibm.com>
To:	kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-pci@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
	iommu@...ts.linux-foundation.org, linux-doc@...r.kernel.org
Cc:	alex.williamson@...hat.com, bhelgaas@...gle.com, aik@...abs.ru,
	benh@...nel.crashing.org, paulus@...ba.org, mpe@...erman.id.au,
	corbet@....net, warrier@...ux.vnet.ibm.com,
	zhong@...ux.vnet.ibm.com, nikunj@...ux.vnet.ibm.com,
	gwshan@...ux.vnet.ibm.com, Yongji Xie <xyjxie@...ux.vnet.ibm.com>
Subject: [RFC v6 02/10] PCI: Do not Use IORESOURCE_STARTALIGN to identify bridge resources

Now we use the IORESOURCE_STARTALIGN to identify bridge resources
in __assign_resources_sorted(). That's quite fragile. We can't
make sure that the PCI devices' resources will not use
IORESOURCE_STARTALIGN any more.

In this patch, we try to use a more robust way to identify
bridge resources.

Signed-off-by: Yongji Xie <xyjxie@...ux.vnet.ibm.com>
---
 drivers/pci/setup-bus.c |    9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/drivers/pci/setup-bus.c b/drivers/pci/setup-bus.c
index 7796d0a..45fc484 100644
--- a/drivers/pci/setup-bus.c
+++ b/drivers/pci/setup-bus.c
@@ -391,6 +391,7 @@ static void __assign_resources_sorted(struct list_head *head,
 	struct pci_dev_resource *dev_res, *tmp_res, *dev_res2;
 	unsigned long fail_type;
 	resource_size_t add_align, align;
+	int index;
 
 	/* Check if optional add_size is there */
 	if (!realloc_head || list_empty(realloc_head))
@@ -411,11 +412,13 @@ static void __assign_resources_sorted(struct list_head *head,
 
 		/*
 		 * There are two kinds of additional resources in the list:
-		 * 1. bridge resource  -- IORESOURCE_STARTALIGN
-		 * 2. SR-IOV resource   -- IORESOURCE_SIZEALIGN
+		 * 1. bridge resource
+		 * 2. SR-IOV resource
 		 * Here just fix the additional alignment for bridge
 		 */
-		if (!(dev_res->res->flags & IORESOURCE_STARTALIGN))
+		index = dev_res->res - dev_res->dev->resource;
+		if (index < PCI_BRIDGE_RESOURCES ||
+			index > PCI_BRIDGE_RESOURCE_END)
 			continue;
 
 		add_align = get_res_add_align(realloc_head, dev_res->res);
-- 
1.7.9.5