linux-kernel - [PATCH 6.7 655/713] devlink: Fix devlink parallel commands processing

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: <20240324224720.1345309-656-sashal@kernel.org>
Date: Sun, 24 Mar 2024 18:46:21 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Shay Drory <shayd@...dia.com>,
	Jiri Pirko <jiri@...dia.com>,
	"David S . Miller" <davem@...emloft.net>,
	Sasha Levin <sashal@...nel.org>
Subject: [PATCH 6.7 655/713] devlink: Fix devlink parallel commands processing

From: Shay Drory <shayd@...dia.com>

[ Upstream commit d7d75124965aee23e5e4421d78376545cf070b0a ]

Commit 870c7ad4a52b ("devlink: protect devlink->dev by the instance
lock") added devlink instance locking inside a loop that iterates over
all the registered devlink instances on the machine in the pre-doit
phase. This can lead to serialization of devlink commands over
different devlink instances.

For example: While the first devlink instance is executing firmware
flash, all commands to other devlink instances on the machine are
forced to wait until the first devlink finishes.

Therefore, in the pre-doit phase, take the devlink instance lock only
for the devlink instance the command is targeting. Devlink layer is
taking a reference on the devlink instance, ensuring the devlink->dev
pointer is valid. This reference taking was introduced by commit
a380687200e0 ("devlink: take device reference for devlink object").
Without this commit, it would not be safe to access devlink->dev
lockless.

Fixes: 870c7ad4a52b ("devlink: protect devlink->dev by the instance lock")
Signed-off-by: Shay Drory <shayd@...dia.com>
Reviewed-by: Jiri Pirko <jiri@...dia.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 net/devlink/netlink.c | 13 +++++++------
 1 file changed, 7 insertions(+), 6 deletions(-)

diff --git a/net/devlink/netlink.c b/net/devlink/netlink.c
index 86f12531bf998..0f41fded6a6d7 100644
--- a/net/devlink/netlink.c
+++ b/net/devlink/netlink.c
@@ -80,12 +80,13 @@ devlink_get_from_attrs_lock(struct net *net, struct nlattr **attrs,
 	devname = nla_data(attrs[DEVLINK_ATTR_DEV_NAME]);

 	devlinks_xa_for_each_registered_get(net, index, devlink) {
-		devl_dev_lock(devlink, dev_lock);
-		if (devl_is_registered(devlink) &&
-		    strcmp(devlink->dev->bus->name, busname) == 0 &&
-		    strcmp(dev_name(devlink->dev), devname) == 0)
-			return devlink;
-		devl_dev_unlock(devlink, dev_lock);
+		if (strcmp(devlink->dev->bus->name, busname) == 0 &&
+		    strcmp(dev_name(devlink->dev), devname) == 0) {
+			devl_dev_lock(devlink, dev_lock);
+			if (devl_is_registered(devlink))
+				return devlink;
+			devl_dev_unlock(devlink, dev_lock);
+		}
 		devlink_put(devlink);
 	}

-- 
2.43.0