selftests/bpf: add precision tracking test (411cdb45) · Commits · 戴 / 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>

tools/testing/selftests/bpf/verifier/precise.c

+25 −0

Original line number	Diff line number	Diff line
		@@ -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,
		},

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