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authorAlexei Starovoitov <ast@fb.com>2017-02-11 07:28:24 +0300
committerDavid S. Miller <davem@davemloft.net>2017-02-13 05:52:19 +0300
commit7f677633379b4abb3281cdbe7e7006f049305c03 (patch)
tree1e5e662e792467d09f8a4ebf5b96b2baa333ae25 /samples/bpf/test_cgrp2_attach.c
parente722af6391949e8851310441bb0cec157d25611d (diff)
downloadlinux-7f677633379b4abb3281cdbe7e7006f049305c03.tar.xz
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: 3007098494be ("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>
Diffstat (limited to 'samples/bpf/test_cgrp2_attach.c')
-rw-r--r--samples/bpf/test_cgrp2_attach.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/samples/bpf/test_cgrp2_attach.c b/samples/bpf/test_cgrp2_attach.c
index 504058631ffc..4bfcaf93fcf3 100644
--- a/samples/bpf/test_cgrp2_attach.c
+++ b/samples/bpf/test_cgrp2_attach.c
@@ -104,7 +104,7 @@ static int attach_filter(int cg_fd, int type, int verdict)
return EXIT_FAILURE;
}
- ret = bpf_prog_attach(prog_fd, cg_fd, type);
+ ret = bpf_prog_attach(prog_fd, cg_fd, type, 0);
if (ret < 0) {
printf("Failed to attach prog to cgroup: '%s'\n",
strerror(errno));