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-rw-r--r--tools/testing/selftests/bpf/verifier/loops1.c28
1 files changed, 28 insertions, 0 deletions
diff --git a/tools/testing/selftests/bpf/verifier/loops1.c b/tools/testing/selftests/bpf/verifier/loops1.c
index 5e980a5ab69d..1fc4e61e9f9f 100644
--- a/tools/testing/selftests/bpf/verifier/loops1.c
+++ b/tools/testing/selftests/bpf/verifier/loops1.c
@@ -159,3 +159,31 @@
.errstr = "loop detected",
.prog_type = BPF_PROG_TYPE_TRACEPOINT,
},
+{
+ "not-taken loop with back jump to 1st insn",
+ .insns = {
+ BPF_MOV64_IMM(BPF_REG_0, 123),
+ BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 4, -2),
+ BPF_EXIT_INSN(),
+ },
+ .result = ACCEPT,
+ .prog_type = BPF_PROG_TYPE_XDP,
+ .retval = 123,
+},
+{
+ "taken loop with back jump to 1st insn",
+ .insns = {
+ BPF_MOV64_IMM(BPF_REG_1, 10),
+ BPF_MOV64_IMM(BPF_REG_2, 0),
+ BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 1),
+ BPF_EXIT_INSN(),
+ BPF_ALU64_REG(BPF_ADD, BPF_REG_2, BPF_REG_1),
+ BPF_ALU64_IMM(BPF_SUB, BPF_REG_1, 1),
+ BPF_JMP_IMM(BPF_JNE, BPF_REG_1, 0, -3),
+ BPF_MOV64_REG(BPF_REG_0, BPF_REG_2),
+ BPF_EXIT_INSN(),
+ },
+ .result = ACCEPT,
+ .prog_type = BPF_PROG_TYPE_XDP,
+ .retval = 55,
+},