Messages in this thread Patch in this message | | | From | Tyler Hicks <> | Subject | [PATCH net-next v3 5/8] net-sysfs: require net admin in the init ns for setting tx_maxrate | Date | Fri, 20 Jul 2018 21:56:51 +0000 |
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An upcoming change will allow container root to open some /sys/class/net files for writing. The tx_maxrate attribute can result in changes to actual hardware devices so err on the side of caution by requiring CAP_NET_ADMIN in the init namespace in the corresponding attribute store operation.
Signed-off-by: Tyler Hicks <tyhicks@canonical.com> --- net/core/net-sysfs.c | 3 +++ 1 file changed, 3 insertions(+)
diff --git a/net/core/net-sysfs.c b/net/core/net-sysfs.c index ffa1d18f2c2c..405c41ecb20b 100644 --- a/net/core/net-sysfs.c +++ b/net/core/net-sysfs.c @@ -1087,6 +1087,9 @@ static ssize_t tx_maxrate_store(struct netdev_queue *queue, int err, index = get_netdev_queue_index(queue); u32 rate = 0; + if (!capable(CAP_NET_ADMIN)) + return -EPERM; + err = kstrtou32(buf, 10, &rate); if (err < 0) return err; -- 2.7.4
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