From: Song Liu <songliubraving@fb.com>
Date: Fri, 12 Feb 2021 18:31:06 +0000 (-0800)
Subject: bpf: Allow bpf_d_path in bpf_iter program
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=3d06f34aa89698f74e743b9ec023eafc19827cba;p=linux.git

bpf: Allow bpf_d_path in bpf_iter program

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
---

diff --git a/kernel/trace/bpf_trace.c b/kernel/trace/bpf_trace.c
index 845b2168e0060..0b9e4fd9c61b0 100644
--- a/kernel/trace/bpf_trace.c
+++ b/kernel/trace/bpf_trace.c
@@ -1191,6 +1191,10 @@ BTF_SET_END(btf_allowlist_d_path)
 
 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)
 		return bpf_lsm_is_sleepable_hook(prog->aux->attach_btf_id);