From 06be0864c77ae6861632a678a6378511a4828d6e Mon Sep 17 00:00:00 2001
From: Daniel Borkmann <daniel@iogearbox.net>
Date: Sat, 2 Jun 2018 23:06:31 +0200
Subject: bpf: test case for map pointer poison with calls/branches

Add several test cases where the same or different map pointers
originate from different paths in the program and execute a map
lookup or tail call at a common location.

Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Song Liu <songliubraving@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
---
 include/linux/filter.h | 10 ++++++++++
 1 file changed, 10 insertions(+)

(limited to 'include')

diff --git a/include/linux/filter.h b/include/linux/filter.h
index d90abdaea94b..6fd375fe7079 100644
--- a/include/linux/filter.h
+++ b/include/linux/filter.h
@@ -289,6 +289,16 @@ struct xdp_buff;
 		.off   = OFF,					\
 		.imm   = 0 })
 
+/* Relative call */
+
+#define BPF_CALL_REL(TGT)					\
+	((struct bpf_insn) {					\
+		.code  = BPF_JMP | BPF_CALL,			\
+		.dst_reg = 0,					\
+		.src_reg = BPF_PSEUDO_CALL,			\
+		.off   = 0,					\
+		.imm   = TGT })
+
 /* Function call */
 
 #define BPF_EMIT_CALL(FUNC)					\
-- 
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