Commit 883e44e4 authored by Alexei Starovoitov's avatar Alexei Starovoitov Committed by David S. Miller

samples/bpf: add verifier tests

add few tests for "pointer to packet" logic of the verifier
Signed-off-by: default avatarAlexei Starovoitov <ast@kernel.org>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 65d472fb
...@@ -1448,6 +1448,86 @@ static struct bpf_test tests[] = { ...@@ -1448,6 +1448,86 @@ static struct bpf_test tests[] = {
.result = ACCEPT, .result = ACCEPT,
.prog_type = BPF_PROG_TYPE_SCHED_CLS, .prog_type = BPF_PROG_TYPE_SCHED_CLS,
}, },
{
"pkt: test1",
.insns = {
BPF_LDX_MEM(BPF_W, BPF_REG_2, BPF_REG_1,
offsetof(struct __sk_buff, data)),
BPF_LDX_MEM(BPF_W, BPF_REG_3, BPF_REG_1,
offsetof(struct __sk_buff, data_end)),
BPF_MOV64_REG(BPF_REG_0, BPF_REG_2),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_0, 8),
BPF_JMP_REG(BPF_JGT, BPF_REG_0, BPF_REG_3, 1),
BPF_LDX_MEM(BPF_B, BPF_REG_0, BPF_REG_2, 0),
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_EXIT_INSN(),
},
.result = ACCEPT,
.prog_type = BPF_PROG_TYPE_SCHED_CLS,
},
{
"pkt: test2",
.insns = {
BPF_MOV64_IMM(BPF_REG_0, 1),
BPF_LDX_MEM(BPF_W, BPF_REG_4, BPF_REG_1,
offsetof(struct __sk_buff, data_end)),
BPF_LDX_MEM(BPF_W, BPF_REG_3, BPF_REG_1,
offsetof(struct __sk_buff, data)),
BPF_MOV64_REG(BPF_REG_5, BPF_REG_3),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_5, 14),
BPF_JMP_REG(BPF_JGT, BPF_REG_5, BPF_REG_4, 15),
BPF_LDX_MEM(BPF_B, BPF_REG_0, BPF_REG_3, 7),
BPF_LDX_MEM(BPF_B, BPF_REG_4, BPF_REG_3, 12),
BPF_ALU64_IMM(BPF_MUL, BPF_REG_4, 14),
BPF_LDX_MEM(BPF_W, BPF_REG_3, BPF_REG_1,
offsetof(struct __sk_buff, data)),
BPF_ALU64_REG(BPF_ADD, BPF_REG_3, BPF_REG_4),
BPF_MOV64_REG(BPF_REG_2, BPF_REG_1),
BPF_ALU64_IMM(BPF_LSH, BPF_REG_2, 48),
BPF_ALU64_IMM(BPF_RSH, BPF_REG_2, 48),
BPF_ALU64_REG(BPF_ADD, BPF_REG_3, BPF_REG_2),
BPF_MOV64_REG(BPF_REG_2, BPF_REG_3),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, 8),
BPF_LDX_MEM(BPF_W, BPF_REG_1, BPF_REG_1,
offsetof(struct __sk_buff, data_end)),
BPF_JMP_REG(BPF_JGT, BPF_REG_2, BPF_REG_1, 1),
BPF_LDX_MEM(BPF_B, BPF_REG_1, BPF_REG_3, 4),
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_EXIT_INSN(),
},
.result = ACCEPT,
.prog_type = BPF_PROG_TYPE_SCHED_CLS,
},
{
"pkt: test3",
.insns = {
BPF_LDX_MEM(BPF_W, BPF_REG_2, BPF_REG_1,
offsetof(struct __sk_buff, data)),
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_EXIT_INSN(),
},
.errstr = "invalid bpf_context access off=76",
.result = REJECT,
.prog_type = BPF_PROG_TYPE_SOCKET_FILTER,
},
{
"pkt: test4",
.insns = {
BPF_LDX_MEM(BPF_W, BPF_REG_2, BPF_REG_1,
offsetof(struct __sk_buff, data)),
BPF_LDX_MEM(BPF_W, BPF_REG_3, BPF_REG_1,
offsetof(struct __sk_buff, data_end)),
BPF_MOV64_REG(BPF_REG_0, BPF_REG_2),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_0, 8),
BPF_JMP_REG(BPF_JGT, BPF_REG_0, BPF_REG_3, 1),
BPF_STX_MEM(BPF_B, BPF_REG_2, BPF_REG_2, 0),
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_EXIT_INSN(),
},
.errstr = "cannot write",
.result = REJECT,
.prog_type = BPF_PROG_TYPE_SCHED_CLS,
},
}; };
static int probe_filter_length(struct bpf_insn *fp) static int probe_filter_length(struct bpf_insn *fp)
......
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment