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net-sysfs: require net admin in the init ns for setting tx_maxrate

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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>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Tyler Hicks 2018-07-20 21:56:51 +00:00 committed by David S. Miller
parent 9944e894c1
commit 3033fced2f
1 changed files with 3 additions and 0 deletions
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3
net/core/net-sysfs.c
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@ -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;