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selftests/bpf: precision tracking tests

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Add two tests to check that stack slot marking during backtracking
doesn't trigger 'spi > allocated_stack' warning.
One test is using BPF_ST insn. Another is using BPF_STX.

Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
This commit is contained in:
Alexei Starovoitov 2019-09-03 15:51:33 -07:00 committed by Daniel Borkmann
parent 7cbbf9f1fa
commit 310f4204ee
1 changed files with 52 additions and 0 deletions
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52
tools/testing/selftests/bpf/verifier/precise.c
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@ -140,3 +140,55 @@
.errstr = "!read_ok", .errstr = "!read_ok",
.result = REJECT, .result = REJECT,
}, },
{
"precise: ST insn causing spi > allocated_stack",
.insns = {
BPF_MOV64_REG(BPF_REG_3, BPF_REG_10),
BPF_JMP_IMM(BPF_JNE, BPF_REG_3, 123, 0),
BPF_ST_MEM(BPF_DW, BPF_REG_3, -8, 0),
BPF_LDX_MEM(BPF_DW, BPF_REG_4, BPF_REG_10, -8),
BPF_MOV64_IMM(BPF_REG_0, -1),
BPF_JMP_REG(BPF_JGT, BPF_REG_4, BPF_REG_0, 0),
BPF_EXIT_INSN(),
},
.prog_type = BPF_PROG_TYPE_XDP,
.flags = BPF_F_TEST_STATE_FREQ,
.errstr = "5: (2d) if r4 > r0 goto pc+0\
last_idx 5 first_idx 5\
parent didn't have regs=10 stack=0 marks\
last_idx 4 first_idx 2\
regs=10 stack=0 before 4\
regs=10 stack=0 before 3\
regs=0 stack=1 before 2\
last_idx 5 first_idx 5\
parent didn't have regs=1 stack=0 marks",
.result = VERBOSE_ACCEPT,
.retval = -1,
},
{
"precise: STX insn causing spi > allocated_stack",
.insns = {
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_get_prandom_u32),
BPF_MOV64_REG(BPF_REG_3, BPF_REG_10),
BPF_JMP_IMM(BPF_JNE, BPF_REG_3, 123, 0),
BPF_STX_MEM(BPF_DW, BPF_REG_3, BPF_REG_0, -8),
BPF_LDX_MEM(BPF_DW, BPF_REG_4, BPF_REG_10, -8),
BPF_MOV64_IMM(BPF_REG_0, -1),
BPF_JMP_REG(BPF_JGT, BPF_REG_4, BPF_REG_0, 0),
BPF_EXIT_INSN(),
},
.prog_type = BPF_PROG_TYPE_XDP,
.flags = BPF_F_TEST_STATE_FREQ,
.errstr = "last_idx 6 first_idx 6\
parent didn't have regs=10 stack=0 marks\
last_idx 5 first_idx 3\
regs=10 stack=0 before 5\
regs=10 stack=0 before 4\
regs=0 stack=1 before 3\
last_idx 6 first_idx 6\
parent didn't have regs=1 stack=0 marks\
last_idx 5 first_idx 3\
regs=1 stack=0 before 5",
.result = VERBOSE_ACCEPT,
.retval = -1,
},