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

Greg Kroah-Hartman
2022-09-26T11:47:52Z

From: Ido Schimmel <idosch@nvidia.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@intel.com>
Tested-by: Jie2x Zhou <jie2x.zhou@intel.com>
Signed-off-by: Ido Schimmel <idosch@nvidia.com>
Reviewed-by: Petr Machata <petrm@nvidia.com>
Link: https://lore.kernel.org/r/20220909153830.3732504-1-idosch@nvidia.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.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