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selftests/bpf: add precision tracking test

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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>
This commit is contained in:
Alexei Starovoitov 2019-08-22 22:52:15 -07:00 committed by Daniel Borkmann
parent e8c13c4d9b
commit 411cdb4569
1 changed files with 25 additions and 0 deletions
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25
tools/testing/selftests/bpf/verifier/precise.c
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@ -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,
},