linux-sg2042/include/uapi
Alexei Starovoitov 7f67763337 bpf: introduce BPF_F_ALLOW_OVERRIDE flag
If BPF_F_ALLOW_OVERRIDE flag is used in BPF_PROG_ATTACH command
to the given cgroup the descendent cgroup will be able to override
effective bpf program that was inherited from this cgroup.
By default it's not passed, therefore override is disallowed.

Examples:
1.
prog X attached to /A with default
prog Y fails to attach to /A/B and /A/B/C
Everything under /A runs prog X

2.
prog X attached to /A with allow_override.
prog Y fails to attach to /A/B with default (non-override)
prog M attached to /A/B with allow_override.
Everything under /A/B runs prog M only.

3.
prog X attached to /A with allow_override.
prog Y fails to attach to /A with default.
The user has to detach first to switch the mode.

In the future this behavior may be extended with a chain of
non-overridable programs.

Also fix the bug where detach from cgroup where nothing is attached
was not throwing error. Return ENOENT in such case.

Add several testcases and adjust libbpf.

Fixes: 3007098494 ("cgroup: add support for eBPF programs")
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Tejun Heo <tj@kernel.org>
Acked-by: Daniel Mack <daniel@zonque.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
2017-02-12 21:52:19 -05:00
..
asm-generic tcp: SOF_TIMESTAMPING_OPT_STATS option for SO_TIMESTAMPING 2016-11-30 10:04:25 -05:00
drm This pull request brings in VEC (TV-out) support for vc4, along with a 2016-12-13 12:05:12 +10:00
linux bpf: introduce BPF_F_ALLOW_OVERRIDE flag 2017-02-12 21:52:19 -05:00
misc cxl: Use fixed width predefined types in data structure. 2016-08-09 16:52:01 +10:00
mtd mtd: kill the nand_ecclayout struct 2016-05-05 23:51:51 +02:00
rdma RDMA: Don't reference kernel private header from UAPI header 2017-02-08 12:28:49 -05:00
scsi Add type 0x28 NVME type code to scsi fc headers 2016-12-06 10:17:03 +02:00
sound Merge remote-tracking branches 'asoc/topic/tlv320aic31xx', 'asoc/topic/topology', 'asoc/topic/uda1380', 'asoc/topic/wm2200' and 'asoc/topic/wm8523' into asoc-next 2016-12-12 15:53:25 +00:00
video
xen xen/evtchn: add IOCTL_EVTCHN_RESTRICT 2016-07-25 10:59:31 +01:00
Kbuild