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]
Message-Id: <20190829111904.16042-3-parav@mellanox.com>
Date:   Thu, 29 Aug 2019 06:19:00 -0500
From:   Parav Pandit <parav@...lanox.com>
To:     alex.williamson@...hat.com, jiri@...lanox.com,
        kwankhede@...dia.com, cohuck@...hat.com, davem@...emloft.net
Cc:     kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org, Parav Pandit <parav@...lanox.com>
Subject: [PATCH v2 2/6] mdev: Make mdev alias unique among all mdevs

Mdev alias should be unique among all the mdevs, so that when such alias
is used by the mdev users to derive other objects, there is no
collision in a given system.

Signed-off-by: Parav Pandit <parav@...lanox.com>

---
Changelog:
v1->v2:
 - Moved alias NULL check at beginning
v0->v1:
 - Fixed inclusiong of alias for NULL check
 - Added ratelimited debug print for sha1 hash collision error
---
 drivers/vfio/mdev/mdev_core.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/vfio/mdev/mdev_core.c b/drivers/vfio/mdev/mdev_core.c
index 3bdff0469607..c9bf2ac362b9 100644
--- a/drivers/vfio/mdev/mdev_core.c
+++ b/drivers/vfio/mdev/mdev_core.c
@@ -388,6 +388,13 @@ int mdev_device_create(struct kobject *kobj, struct device *dev,
 			ret = -EEXIST;
 			goto mdev_fail;
 		}
+		if (alias && tmp->alias && strcmp(alias, tmp->alias) == 0) {
+			mutex_unlock(&mdev_list_lock);
+			ret = -EEXIST;
+			dev_dbg_ratelimited(dev, "Hash collision in alias creation for UUID %pUl\n",
+					    uuid);
+			goto mdev_fail;
+		}
 	}
 
 	mdev = kzalloc(sizeof(*mdev), GFP_KERNEL);
-- 
2.19.2

Powered by blists - more mailing lists

Powered by Openwall GNU/*/Linux Powered by OpenVZ