selftests/bpf: add precision tracking test

Copy-paste of existing test
"calls: cross frame pruning - liveness propagation"
but ran with different parentage chain heuristic
which stresses different path in precision tracking logic.

Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Song Liu <songliubraving@fb.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>

diff --git a/tools/testing/selftests/bpf/verifier/precise.c b/tools/testing/selftests/bpf/verifier/precise.c
index a20953c..a455a4a 100644 (file)
--- a/tools/testing/selftests/bpf/verifier/precise.c
+++ b/tools/testing/selftests/bpf/verifier/precise.c
@@ -115,3 +115,28 @@
        regs=300 stack=0 before 17\
        parent already had regs=0 stack=0 marks",
 },
+{
+       "precise: cross frame pruning",
+       .insns = {
+       BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_get_prandom_u32),
+       BPF_MOV64_IMM(BPF_REG_8, 0),
+       BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 0, 1),
+       BPF_MOV64_IMM(BPF_REG_8, 1),
+       BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_get_prandom_u32),
+       BPF_MOV64_IMM(BPF_REG_9, 0),
+       BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 0, 1),
+       BPF_MOV64_IMM(BPF_REG_9, 1),
+       BPF_MOV64_REG(BPF_REG_1, BPF_REG_0),
+       BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 4),
+       BPF_JMP_IMM(BPF_JEQ, BPF_REG_8, 1, 1),
+       BPF_LDX_MEM(BPF_B, BPF_REG_1, BPF_REG_2, 0),
+       BPF_MOV64_IMM(BPF_REG_0, 0),
+       BPF_EXIT_INSN(),
+       BPF_JMP_IMM(BPF_JEQ, BPF_REG_1, 0, 0),
+       BPF_EXIT_INSN(),
+       },
+       .prog_type = BPF_PROG_TYPE_XDP,
+       .flags = BPF_F_TEST_STATE_FREQ,
+       .errstr = "!read_ok",
+       .result = REJECT,
+},