linux-kernel - [PATCH 5.19 118/207] netdevsim: Fix hwstats debugfs file permissions

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Message-Id: <20220926100811.846001745@linuxfoundation.org>
Date:   Mon, 26 Sep 2022 12:11:47 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Jie2x Zhou <jie2x.zhou@...el.com>,
        Ido Schimmel <idosch@...dia.com>,
        Petr Machata <petrm@...dia.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.19 118/207] netdevsim: Fix hwstats debugfs file permissions

From: Ido Schimmel <idosch@...dia.com>

[ Upstream commit 34513ada53eb3e3f711250d8dbc2de4de493d510 ]

The hwstats debugfs files are only writeable, but they are created with
read and write permissions, causing certain selftests to fail [1].

Fix by creating the files with write permission only.

[1]
 # ./test_offload.py
 Test destruction of generic XDP...
 Traceback (most recent call last):
   File "/home/idosch/code/linux/tools/testing/selftests/bpf/./test_offload.py", line 810, in <module>
     simdev = NetdevSimDev()
 [...]
 Exception: Command failed: cat /sys/kernel/debug/netdevsim/netdevsim0//ports/0/dev/hwstats/l3/disable_ifindex

 cat: /sys/kernel/debug/netdevsim/netdevsim0//ports/0/dev/hwstats/l3/disable_ifindex: Invalid argument

Fixes: 1a6d7ae7d63c ("netdevsim: Introduce support for L3 offload xstats")
Reported-by: Jie2x Zhou <jie2x.zhou@...el.com>
Tested-by: Jie2x Zhou <jie2x.zhou@...el.com>
Signed-off-by: Ido Schimmel <idosch@...dia.com>
Reviewed-by: Petr Machata <petrm@...dia.com>
Link: https://lore.kernel.org/r/20220909153830.3732504-1-idosch@nvidia.com
Signed-off-by: Jakub Kicinski <kuba@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/net/netdevsim/hwstats.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/net/netdevsim/hwstats.c b/drivers/net/netdevsim/hwstats.c
index 605a38e16db0..0e58aa7f0374 100644
--- a/drivers/net/netdevsim/hwstats.c
+++ b/drivers/net/netdevsim/hwstats.c
@@ -433,11 +433,11 @@ int nsim_dev_hwstats_init(struct nsim_dev *nsim_dev)
 		goto err_remove_hwstats_recursive;
 	}
 
-	debugfs_create_file("enable_ifindex", 0600, hwstats->l3_ddir, hwstats,
+	debugfs_create_file("enable_ifindex", 0200, hwstats->l3_ddir, hwstats,
 			    &nsim_dev_hwstats_l3_enable_fops.fops);
-	debugfs_create_file("disable_ifindex", 0600, hwstats->l3_ddir, hwstats,
+	debugfs_create_file("disable_ifindex", 0200, hwstats->l3_ddir, hwstats,
 			    &nsim_dev_hwstats_l3_disable_fops.fops);
-	debugfs_create_file("fail_next_enable", 0600, hwstats->l3_ddir, hwstats,
+	debugfs_create_file("fail_next_enable", 0200, hwstats->l3_ddir, hwstats,
 			    &nsim_dev_hwstats_l3_fail_fops.fops);
 
 	INIT_DELAYED_WORK(&hwstats->traffic_dw,
-- 
2.35.1