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| author | Andrii Nakryiko <andrii@kernel.org> | 2024-01-23 18:21:21 -0800 |
|---|---|---|
| committer | Alexei Starovoitov <ast@kernel.org> | 2024-01-24 16:21:02 -0800 |
| commit | f3dcee938f485cf403ba2acf1f1548afe637c904 (patch) | |
| tree | 8bdb88a3455d9395770e6cca76eee597453bd33e /tools/lib/bpf/bpf.c | |
| parent | 05f9cdd55d61cf9c6283fd3dc0edc7cad09bd7fe (diff) | |
| download | linux-f3dcee938f485cf403ba2acf1f1548afe637c904.tar.gz linux-f3dcee938f485cf403ba2acf1f1548afe637c904.tar.bz2 linux-f3dcee938f485cf403ba2acf1f1548afe637c904.zip | |
libbpf: Wire up token_fd into feature probing logic
Adjust feature probing callbacks to take into account optional token_fd.
In unprivileged contexts, some feature detectors would fail to detect
kernel support just because BPF program, BPF map, or BTF object can't be
loaded due to privileged nature of those operations. So when BPF object
is loaded with BPF token, this token should be used for feature probing.
This patch is setting support for this scenario, but we don't yet pass
non-zero token FD. This will be added in the next patch.
We also switched BPF cookie detector from using kprobe program to
tracepoint one, as tracepoint is somewhat less dangerous BPF program
type and has higher likelihood of being allowed through BPF token in the
future. This change has no effect on detection behavior.
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: John Fastabend <john.fastabend@gmail.com>
Link: https://lore.kernel.org/bpf/20240124022127.2379740-25-andrii@kernel.org
Diffstat (limited to 'tools/lib/bpf/bpf.c')
| -rw-r--r-- | tools/lib/bpf/bpf.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/tools/lib/bpf/bpf.c b/tools/lib/bpf/bpf.c index 1ebf224b8c56..97ec005c3c47 100644 --- a/tools/lib/bpf/bpf.c +++ b/tools/lib/bpf/bpf.c @@ -103,7 +103,7 @@ int sys_bpf_prog_load(union bpf_attr *attr, unsigned int size, int attempts) * [0] https://lore.kernel.org/bpf/20201201215900.3569844-1-guro@fb.com/ * [1] d05512618056 ("bpf: Add bpf_ktime_get_coarse_ns helper") */ -int probe_memcg_account(void) +int probe_memcg_account(int token_fd) { const size_t attr_sz = offsetofend(union bpf_attr, attach_btf_obj_fd); struct bpf_insn insns[] = { @@ -120,6 +120,9 @@ int probe_memcg_account(void) attr.insns = ptr_to_u64(insns); attr.insn_cnt = insn_cnt; attr.license = ptr_to_u64("GPL"); + attr.prog_token_fd = token_fd; + if (token_fd) + attr.prog_flags |= BPF_F_TOKEN_FD; prog_fd = sys_bpf_fd(BPF_PROG_LOAD, &attr, attr_sz); if (prog_fd >= 0) { |