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[PATCH 4.9 34/94] bpf: add bpf_clone_redirect to bpf_helper_changes_pkt_data

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  [PATCH 4.9 34/94] bpf: add bpf_clone_redirect to bpf_helper_changes_pkt_data Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-06-05 19:10 +0200

#1657939 — [PATCH 4.9 34/94] bpf: add bpf_clone_redirect to bpf_helper_changes_pkt_data

4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Daniel Borkmann <daniel@iogearbox.net>


[ Upstream commit 41703a731066fde79c3e5ccf3391cf77a98aeda5 ]

The bpf_clone_redirect() still needs to be listed in
bpf_helper_changes_pkt_data() since we call into
bpf_try_make_head_writable() from there, thus we need
to invalidate prior pkt regs as well.

Fixes: 36bbef52c7eb ("bpf: direct packet write and access for helpers for clsact progs")
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 net/core/filter.c |    1 +
 1 file changed, 1 insertion(+)

--- a/net/core/filter.c
+++ b/net/core/filter.c
@@ -2198,6 +2198,7 @@ bool bpf_helper_changes_skb_data(void *f
 	    func == bpf_skb_change_proto ||
 	    func == bpf_skb_change_tail ||
 	    func == bpf_skb_pull_data ||
+	    func == bpf_clone_redirect ||
 	    func == bpf_l3_csum_replace ||
 	    func == bpf_l4_csum_replace)
 		return true;

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