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linux/tools/lib
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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
..
api make use of make variable CURDIR instead of calling pwd 2016-12-11 12:12:56 +01:00
bpf bpf: introduce BPF_F_ALLOW_OVERRIDE flag 2017-02-12 21:52:19 -05:00
lockdep make use of make variable CURDIR instead of calling pwd 2016-12-11 12:12:56 +01:00
subcmd perf/urgent fixes and one improvement: 2017-01-05 08:33:02 +01:00
symbol tools lib symbol: Introduce kallsyms2elf_type 2015-09-30 18:34:31 -03:00
traceevent perf/urgent fixes and one improvement: 2017-01-05 08:33:02 +01:00
bitmap.c tools lib: Add bitmap_and function 2016-08-02 16:33:27 -03:00
find_bit.c tools lib: Add for_each_clear_bit macro 2016-10-24 11:07:33 -03:00
hweight.c tools: Copy lib/hweight.c from the kernel sources 2015-07-09 16:29:56 -03:00
rbtree.c
str_error_r.c tools: Introduce str_error_r() 2016-07-12 15:19:47 -03:00
string.c perf tools: Move strlcpy() from perf to tools/lib/string.c 2015-12-16 16:09:39 -03:00
vsprintf.c perf tools: Uninline scnprintf() and vscnprint() 2016-07-12 15:20:24 -03:00