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From:   Florent Revest <revest@chromium.org>
To:     bpf@vger.kernel.org
Cc:     ast@kernel.org, daniel@iogearbox.net, andrii@kernel.org,
        kpsingh@kernel.org, jackmanb@google.com,
        linux-kernel@vger.kernel.org, Florent Revest <revest@chromium.org>
Subject: [PATCH bpf-next] bpf: Allow bpf_d_path in perf_event_mmap
Date:   Thu, 28 Oct 2021 18:43:57 +0200
Message-Id: <20211028164357.1439102-1-revest@chromium.org>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Precedence: bulk

Allow the helper to be called from the perf_event_mmap hook. This is
convenient to lookup vma->vm_file and implement a similar logic as
perf_event_mmap_event in BPF.

Signed-off-by: Florent Revest <revest@chromium.org>
---
 kernel/trace/bpf_trace.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/kernel/trace/bpf_trace.c b/kernel/trace/bpf_trace.c
index cbcd0d6fca7c..f6e301c775a5 100644
--- a/kernel/trace/bpf_trace.c
+++ b/kernel/trace/bpf_trace.c
@@ -922,6 +922,9 @@ BTF_ID(func, vfs_fallocate)
 BTF_ID(func, dentry_open)
 BTF_ID(func, vfs_getattr)
 BTF_ID(func, filp_close)
+#ifdef CONFIG_PERF_EVENTS
+BTF_ID(func, perf_event_mmap)
+#endif
 BTF_SET_END(btf_allowlist_d_path)
 
 static bool bpf_d_path_allowed(const struct bpf_prog *prog)
-- 
2.33.0.1079.g6e70778dc9-goog