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| author | John Fastabend <[email protected]> | 2020-05-24 16:50:55 +0000 |
|---|---|---|
| committer | Alexei Starovoitov <[email protected]> | 2020-06-01 21:38:20 +0000 |
| commit | f470378c7562a2818b45ed11c98973f2b89eedd3 (patch) | |
| tree | 644a058b0dd4945cc4fe53c4e07c299ba68d16a7 /tools/testing/selftests/bpf/prog_tests/sockmap_basic.c | |
| parent | bpf, sk_msg: Add some generic helpers that may be useful from sk_msg (diff) | |
| download | kernel-f470378c7562a2818b45ed11c98973f2b89eedd3.tar.gz kernel-f470378c7562a2818b45ed11c98973f2b89eedd3.zip | |
bpf: Extend bpf_base_func_proto helpers with probe_* and *current_task*
Often it is useful when applying policy to know something about the
task. If the administrator has CAP_SYS_ADMIN rights then they can
use kprobe + networking hook and link the two programs together to
accomplish this. However, this is a bit clunky and also means we have
to call both the network program and kprobe program when we could just
use a single program and avoid passing metadata through sk_msg/skb->cb,
socket, maps, etc.
To accomplish this add probe_* helpers to bpf_base_func_proto programs
guarded by a perfmon_capable() check. New supported helpers are the
following,
BPF_FUNC_get_current_task
BPF_FUNC_probe_read_user
BPF_FUNC_probe_read_kernel
BPF_FUNC_probe_read_user_str
BPF_FUNC_probe_read_kernel_str
Signed-off-by: John Fastabend <[email protected]>
Signed-off-by: Daniel Borkmann <[email protected]>
Acked-by: Yonghong Song <[email protected]>
Link: https://lore.kernel.org/bpf/159033905529.12355.4368381069655254932.stgit@john-Precision-5820-Tower
Signed-off-by: Alexei Starovoitov <[email protected]>
Diffstat (limited to 'tools/testing/selftests/bpf/prog_tests/sockmap_basic.c')
0 files changed, 0 insertions, 0 deletions