linux-kernel - [PATCH 8/9] RapidIO: Add device access check into the enumeration

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: Windows password security audit tool. GUI, reports in PDF.

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

Date:	Fri, 13 Aug 2010 11:18:05 -0400
From:	Alexandre Bounine <alexandre.bounine@....com>
To:	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	linuxppc-dev@...abs.org
Cc:	Alexandre Bounine <alexandre.bounine@....com>,
	Matt Porter <mporter@...nel.crashing.org>,
	Li Yang <leoli@...escale.com>,
	Kumar Gala <galak@...nel.crashing.org>
Subject: [PATCH 8/9] RapidIO: Add device access check into the enumeration

Add explicit device access check before performing device enumeration.
This gives a chance to clear possible link error conditions by issuing safe
maintenance read request(s).

Signed-off-by: Alexandre Bounine <alexandre.bounine@....com>
Reviewed-by: Thomas Moll <thomas.moll@...go.com>
Cc: Matt Porter <mporter@...nel.crashing.org>
Cc: Li Yang <leoli@...escale.com>
Cc: Kumar Gala <galak@...nel.crashing.org>
---
 drivers/rapidio/rio-scan.c |    6 ++++++
 drivers/rapidio/rio.c      |    2 +-
 drivers/rapidio/rio.h      |    2 ++
 3 files changed, 9 insertions(+), 1 deletions(-)

diff --git a/drivers/rapidio/rio-scan.c b/drivers/rapidio/rio-scan.c
index 5dc33d1..fb5324b 100644
--- a/drivers/rapidio/rio-scan.c
+++ b/drivers/rapidio/rio-scan.c
@@ -761,6 +761,12 @@ static int __devinit rio_enum_peer(struct rio_net *net, struct rio_mport *port,
 	u16 destid;
 	int tmp;
 
+	if (rio_mport_chk_dev_access(port,
+			RIO_ANY_DESTID(port->sys_size), hopcount)) {
+		pr_debug("RIO: device access check failed\n");
+		return -1;
+	}
+
 	if (rio_get_host_deviceid_lock(port, hopcount) == port->host_deviceid) {
 		pr_debug("RIO: PE already discovered by this host\n");
 		/*
diff --git a/drivers/rapidio/rio.c b/drivers/rapidio/rio.c
index 22f7847..9621a7b 100644
--- a/drivers/rapidio/rio.c
+++ b/drivers/rapidio/rio.c
@@ -544,7 +544,7 @@ rio_chk_dev_route(struct rio_dev *rdev, struct rio_dev **nrdev, int *npnum)
  * @destid: Device destination ID in network
  * @hopcount: Number of hops into the network
  */
-static int
+int
 rio_mport_chk_dev_access(struct rio_mport *mport, u16 destid, u8 hopcount)
 {
 	int i = 0;
diff --git a/drivers/rapidio/rio.h b/drivers/rapidio/rio.h
index bc71ba1..d249a12 100644
--- a/drivers/rapidio/rio.h
+++ b/drivers/rapidio/rio.h
@@ -24,6 +24,8 @@ extern u32 rio_mport_get_physefb(struct rio_mport *port, int local,
 				 u16 destid, u8 hopcount);
 extern u32 rio_mport_get_efb(struct rio_mport *port, int local, u16 destid,
 			     u8 hopcount, u32 from);
+extern int rio_mport_chk_dev_access(struct rio_mport *mport, u16 destid,
+				    u8 hopcount);
 extern int rio_create_sysfs_dev_files(struct rio_dev *rdev);
 extern int rio_enum_mport(struct rio_mport *mport);
 extern int rio_disc_mport(struct rio_mport *mport);
-- 
1.7.0.5

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/