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tools/bpf: Add verifier tests for 32bit pointer/scalar arithmetic

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Added two test_verifier subtests for 32bit pointer/scalar arithmetic
with BPF_SUB operator. They are passing verifier now.

Signed-off-by: Yonghong Song <yhs@fb.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20200618234632.3321367-1-yhs@fb.com
This commit is contained in:
Yonghong Song 2020-06-18 16:46:32 -07:00 committed by Daniel Borkmann
parent 6c6935419e
commit d56b74b9e1
1 changed files with 38 additions and 0 deletions
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38
tools/testing/selftests/bpf/verifier/value_ptr_arith.c
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@ -836,3 +836,41 @@
.errstr = "R0 invalid mem access 'inv'",
.errstr_unpriv = "R0 pointer -= pointer prohibited",
},
{
"32bit pkt_ptr -= scalar",
.insns = {
BPF_LDX_MEM(BPF_W, BPF_REG_8, BPF_REG_1,
offsetof(struct __sk_buff, data_end)),
BPF_LDX_MEM(BPF_W, BPF_REG_7, BPF_REG_1,
offsetof(struct __sk_buff, data)),
BPF_MOV64_REG(BPF_REG_6, BPF_REG_7),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_6, 40),
BPF_JMP_REG(BPF_JGT, BPF_REG_6, BPF_REG_8, 2),
BPF_ALU32_REG(BPF_MOV, BPF_REG_4, BPF_REG_7),
BPF_ALU32_REG(BPF_SUB, BPF_REG_6, BPF_REG_4),
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_EXIT_INSN(),
},
.prog_type = BPF_PROG_TYPE_SCHED_CLS,
.result = ACCEPT,
.flags = F_NEEDS_EFFICIENT_UNALIGNED_ACCESS,
},
{
"32bit scalar -= pkt_ptr",
.insns = {
BPF_LDX_MEM(BPF_W, BPF_REG_8, BPF_REG_1,
offsetof(struct __sk_buff, data_end)),
BPF_LDX_MEM(BPF_W, BPF_REG_7, BPF_REG_1,
offsetof(struct __sk_buff, data)),
BPF_MOV64_REG(BPF_REG_6, BPF_REG_7),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_6, 40),
BPF_JMP_REG(BPF_JGT, BPF_REG_6, BPF_REG_8, 2),
BPF_ALU32_REG(BPF_MOV, BPF_REG_4, BPF_REG_6),
BPF_ALU32_REG(BPF_SUB, BPF_REG_4, BPF_REG_7),
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_EXIT_INSN(),
},
.prog_type = BPF_PROG_TYPE_SCHED_CLS,
.result = ACCEPT,
.flags = F_NEEDS_EFFICIENT_UNALIGNED_ACCESS,
},