On 4/4/20 12:37 AM, Roman Gushchin wrote:
On Fri, Apr 03, 2020 at 07:55:28PM +0200, Odin Ugedal wrote:Original cgroup v2 eBPF code for filtering device access made it possible to compile with CONFIG_CGROUP_DEVICE=n and still use the eBPF filtering. Change commit 4b7d4d453fc4 ("device_cgroup: Export devcgroup_check_permission") reverted this, making it required to set it to y. Since the device filtering (and all the docs) for cgroup v2 is no longer a "device controller" like it was in v1, someone might compile their kernel with CONFIG_CGROUP_DEVICE=n. Then (for linux 5.5+) the eBPF filter will not be invoked, and all processes will be allowed access to all devices, no matter what the eBPF filter says. Signed-off-by: Odin Ugedal <odin@xxxxxxxxxx>The patch makes perfect sense to me. Acked-by: Roman Gushchin <guro@xxxxxx>
Tejun, I presume you'll pick this up (given the files this fix touches)? Thanks, Daniel
