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bpf: Allow bpf_d_path in bpf_iter program

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task_file and task_vma iter programs have access to file->f_path. Enable
bpf_d_path to print paths of these file.

Signed-off-by: Song Liu <songliubraving@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Yonghong Song <yhs@fb.com>
Link: https://lore.kernel.org/bpf/20210212183107.50963-3-songliubraving@fb.com
This commit is contained in:
Song Liu 2021-02-12 10:31:06 -08:00 committed by Alexei Starovoitov
parent 3a7b35b899
commit 3d06f34aa8
1 changed files with 4 additions and 0 deletions
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4
kernel/trace/bpf_trace.c
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@ -1191,6 +1191,10 @@ BTF_SET_END(btf_allowlist_d_path)
static bool bpf_d_path_allowed(const struct bpf_prog *prog) static bool bpf_d_path_allowed(const struct bpf_prog *prog)
{ {
if (prog->type == BPF_PROG_TYPE_TRACING &&
prog->expected_attach_type == BPF_TRACE_ITER)
return true;
if (prog->type == BPF_PROG_TYPE_LSM) if (prog->type == BPF_PROG_TYPE_LSM)
return bpf_lsm_is_sleepable_hook(prog->aux->attach_btf_id); return bpf_lsm_is_sleepable_hook(prog->aux->attach_btf_id);