Messages in this thread | | | From | David Laight <> | Subject | RE: [PATCH 2/4] fs: define a firmware security filesystem named fwsecurityfs | Date | Mon, 21 Nov 2022 16:12:53 +0000 |
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From: James Bottomley > Sent: 21 November 2022 14:03 ... > > Then how does the networking code handle the namespace stuff in > > sysfs? > > That seems to work today, or am I missing something? > > have you actually tried? > > jejb@lingrow:~> sudo unshare --net bash > lingrow:/home/jejb # ls /sys/class/net/ > lo tun0 tun10 wlan0 > lingrow:/home/jejb # ip link show > 1: lo: <LOOPBACK> mtu 65536 qdisc noop state DOWN mode DEFAULT group > default qlen 1000 > link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 > > So, as you see, I've entered a network namespace and ip link shows me > the only interface I can see in that namespace (a down loopback) but > sysfs shows me every interface on the system outside the namespace.
You have to remount /sys to get the restricted copy. eg by running 'ip netns exec namespace command'.
David
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