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selftests/bpf: Test bpf_strtol and bpf_strtoul helpers 

Test that bpf_strtol and  bpf_strtoul helpers can be used to convert
provided buffer to long or unsigned long correspondingly and return both
correct result and number of consumed bytes, or proper errno.

Example of output:
  # ./test_sysctl
  ..
  Test case: bpf_strtoul one number string .. [PASS]
  Test case: bpf_strtoul multi number string .. [PASS]
  Test case: bpf_strtoul buf_len = 0, reject .. [PASS]
  Test case: bpf_strtoul supported base, ok .. [PASS]
  Test case: bpf_strtoul unsupported base, EINVAL .. [PASS]
  Test case: bpf_strtoul buf with spaces only, EINVAL .. [PASS]
  Test case: bpf_strtoul negative number, EINVAL .. [PASS]
  Test case: bpf_strtol negative number, ok .. [PASS]
  Test case: bpf_strtol hex number, ok .. [PASS]
  Test case: bpf_strtol max long .. [PASS]
  Test case: bpf_strtol overflow, ERANGE .. [PASS]
  Summary: 36 PASSED, 0 FAILED

Signed-off-by: Andrey Ignatov <rdna@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Andrey Ignatov 2019-03-18 18:21:18 -07:00 committed by Alexei Starovoitov
parent c2d5f12e4c
commit 8549ddc832
1 changed files with 485 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

485
tools/testing/selftests/bpf/test_sysctl.c
View File

@ -817,6 +817,491 @@ static struct sysctl_test tests[] = {
.newval = "606",
.result = SUCCESS,
},
{
"bpf_strtoul one number string",
.insns = {
/* arg1 (buf) */
BPF_MOV64_REG(BPF_REG_7, BPF_REG_10),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_7, -8),
BPF_MOV64_IMM(BPF_REG_0, 0x00303036),
BPF_STX_MEM(BPF_DW, BPF_REG_7, BPF_REG_0, 0),
BPF_MOV64_REG(BPF_REG_1, BPF_REG_7),
/* arg2 (buf_len) */
BPF_MOV64_IMM(BPF_REG_2, 4),
/* arg3 (flags) */
BPF_MOV64_IMM(BPF_REG_3, 0),
/* arg4 (res) */
BPF_ALU64_IMM(BPF_ADD, BPF_REG_7, -8),
BPF_STX_MEM(BPF_DW, BPF_REG_7, BPF_REG_0, 0),
BPF_MOV64_REG(BPF_REG_4, BPF_REG_7),
BPF_EMIT_CALL(BPF_FUNC_strtoul),
/* if (ret == expected && */
BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 3, 4),
/* res == expected) */
BPF_LDX_MEM(BPF_DW, BPF_REG_9, BPF_REG_7, 0),
BPF_JMP_IMM(BPF_JNE, BPF_REG_9, 600, 2),
/* return ALLOW; */
BPF_MOV64_IMM(BPF_REG_0, 1),
BPF_JMP_A(1),
/* else return DENY; */
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_EXIT_INSN(),
},
.attach_type = BPF_CGROUP_SYSCTL,
.sysctl = "net/ipv4/route/mtu_expires",
.open_flags = O_RDONLY,
.result = SUCCESS,
},
{
"bpf_strtoul multi number string",
.insns = {
/* arg1 (buf) */
BPF_MOV64_REG(BPF_REG_7, BPF_REG_10),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_7, -8),
/* "600 602\0" */
BPF_LD_IMM64(BPF_REG_0, 0x0032303620303036ULL),
BPF_STX_MEM(BPF_DW, BPF_REG_7, BPF_REG_0, 0),
BPF_MOV64_REG(BPF_REG_1, BPF_REG_7),
/* arg2 (buf_len) */
BPF_MOV64_IMM(BPF_REG_2, 8),
/* arg3 (flags) */
BPF_MOV64_IMM(BPF_REG_3, 0),
/* arg4 (res) */
BPF_ALU64_IMM(BPF_ADD, BPF_REG_7, -8),
BPF_STX_MEM(BPF_DW, BPF_REG_7, BPF_REG_0, 0),
BPF_MOV64_REG(BPF_REG_4, BPF_REG_7),
BPF_EMIT_CALL(BPF_FUNC_strtoul),
/* if (ret == expected && */
BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 3, 18),
/* res == expected) */
BPF_LDX_MEM(BPF_DW, BPF_REG_9, BPF_REG_7, 0),
BPF_JMP_IMM(BPF_JNE, BPF_REG_9, 600, 16),
/* arg1 (buf) */
BPF_MOV64_REG(BPF_REG_7, BPF_REG_10),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_7, -8),
BPF_ALU64_REG(BPF_ADD, BPF_REG_7, BPF_REG_0),
BPF_MOV64_REG(BPF_REG_1, BPF_REG_7),
/* arg2 (buf_len) */
BPF_MOV64_IMM(BPF_REG_2, 8),
BPF_ALU64_REG(BPF_SUB, BPF_REG_2, BPF_REG_0),
/* arg3 (flags) */
BPF_MOV64_IMM(BPF_REG_3, 0),
/* arg4 (res) */
BPF_MOV64_REG(BPF_REG_7, BPF_REG_10),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_7, -16),
BPF_MOV64_REG(BPF_REG_4, BPF_REG_7),
BPF_EMIT_CALL(BPF_FUNC_strtoul),
/* if (ret == expected && */
BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 4, 4),
/* res == expected) */
BPF_LDX_MEM(BPF_DW, BPF_REG_9, BPF_REG_7, 0),
BPF_JMP_IMM(BPF_JNE, BPF_REG_9, 602, 2),
/* return ALLOW; */
BPF_MOV64_IMM(BPF_REG_0, 1),
BPF_JMP_A(1),
/* else return DENY; */
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_EXIT_INSN(),
},
.attach_type = BPF_CGROUP_SYSCTL,
.sysctl = "net/ipv4/tcp_mem",
.open_flags = O_RDONLY,
.result = SUCCESS,
},
{
"bpf_strtoul buf_len = 0, reject",
.insns = {
/* arg1 (buf) */
BPF_MOV64_REG(BPF_REG_7, BPF_REG_10),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_7, -8),
BPF_MOV64_IMM(BPF_REG_0, 0x00303036),
BPF_STX_MEM(BPF_DW, BPF_REG_7, BPF_REG_0, 0),
BPF_MOV64_REG(BPF_REG_1, BPF_REG_7),
/* arg2 (buf_len) */
BPF_MOV64_IMM(BPF_REG_2, 0),
/* arg3 (flags) */
BPF_MOV64_IMM(BPF_REG_3, 0),
/* arg4 (res) */
BPF_ALU64_IMM(BPF_ADD, BPF_REG_7, -8),
BPF_STX_MEM(BPF_DW, BPF_REG_7, BPF_REG_0, 0),
BPF_MOV64_REG(BPF_REG_4, BPF_REG_7),
BPF_EMIT_CALL(BPF_FUNC_strtoul),
BPF_MOV64_IMM(BPF_REG_0, 1),
BPF_EXIT_INSN(),
},
.attach_type = BPF_CGROUP_SYSCTL,
.sysctl = "net/ipv4/route/mtu_expires",
.open_flags = O_RDONLY,
.result = LOAD_REJECT,
},
{
"bpf_strtoul supported base, ok",
.insns = {
/* arg1 (buf) */
BPF_MOV64_REG(BPF_REG_7, BPF_REG_10),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_7, -8),
BPF_MOV64_IMM(BPF_REG_0, 0x00373730),
BPF_STX_MEM(BPF_DW, BPF_REG_7, BPF_REG_0, 0),
BPF_MOV64_REG(BPF_REG_1, BPF_REG_7),
/* arg2 (buf_len) */
BPF_MOV64_IMM(BPF_REG_2, 4),
/* arg3 (flags) */
BPF_MOV64_IMM(BPF_REG_3, 8),
/* arg4 (res) */
BPF_ALU64_IMM(BPF_ADD, BPF_REG_7, -8),
BPF_STX_MEM(BPF_DW, BPF_REG_7, BPF_REG_0, 0),
BPF_MOV64_REG(BPF_REG_4, BPF_REG_7),
BPF_EMIT_CALL(BPF_FUNC_strtoul),
/* if (ret == expected && */
BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 3, 4),
/* res == expected) */
BPF_LDX_MEM(BPF_DW, BPF_REG_9, BPF_REG_7, 0),
BPF_JMP_IMM(BPF_JNE, BPF_REG_9, 63, 2),
/* return ALLOW; */
BPF_MOV64_IMM(BPF_REG_0, 1),
BPF_JMP_A(1),
/* else return DENY; */
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_EXIT_INSN(),
},
.attach_type = BPF_CGROUP_SYSCTL,
.sysctl = "net/ipv4/route/mtu_expires",
.open_flags = O_RDONLY,
.result = SUCCESS,
},
{
"bpf_strtoul unsupported base, EINVAL",
.insns = {
/* arg1 (buf) */
BPF_MOV64_REG(BPF_REG_7, BPF_REG_10),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_7, -8),
BPF_MOV64_IMM(BPF_REG_0, 0x00303036),
BPF_STX_MEM(BPF_DW, BPF_REG_7, BPF_REG_0, 0),
BPF_MOV64_REG(BPF_REG_1, BPF_REG_7),
/* arg2 (buf_len) */
BPF_MOV64_IMM(BPF_REG_2, 4),
/* arg3 (flags) */
BPF_MOV64_IMM(BPF_REG_3, 3),
/* arg4 (res) */
BPF_ALU64_IMM(BPF_ADD, BPF_REG_7, -8),
BPF_STX_MEM(BPF_DW, BPF_REG_7, BPF_REG_0, 0),
BPF_MOV64_REG(BPF_REG_4, BPF_REG_7),
BPF_EMIT_CALL(BPF_FUNC_strtoul),
/* if (ret == expected) */
BPF_JMP_IMM(BPF_JNE, BPF_REG_0, -EINVAL, 2),
/* return ALLOW; */
BPF_MOV64_IMM(BPF_REG_0, 1),
BPF_JMP_A(1),
/* else return DENY; */
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_EXIT_INSN(),
},
.attach_type = BPF_CGROUP_SYSCTL,
.sysctl = "net/ipv4/route/mtu_expires",
.open_flags = O_RDONLY,
.result = SUCCESS,
},
{
"bpf_strtoul buf with spaces only, EINVAL",
.insns = {
/* arg1 (buf) */
BPF_MOV64_REG(BPF_REG_7, BPF_REG_10),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_7, -8),
BPF_MOV64_IMM(BPF_REG_0, 0x090a0c0d),
BPF_STX_MEM(BPF_DW, BPF_REG_7, BPF_REG_0, 0),
BPF_MOV64_REG(BPF_REG_1, BPF_REG_7),
/* arg2 (buf_len) */
BPF_MOV64_IMM(BPF_REG_2, 4),
/* arg3 (flags) */
BPF_MOV64_IMM(BPF_REG_3, 0),
/* arg4 (res) */
BPF_ALU64_IMM(BPF_ADD, BPF_REG_7, -8),
BPF_STX_MEM(BPF_DW, BPF_REG_7, BPF_REG_0, 0),
BPF_MOV64_REG(BPF_REG_4, BPF_REG_7),
BPF_EMIT_CALL(BPF_FUNC_strtoul),
/* if (ret == expected) */
BPF_JMP_IMM(BPF_JNE, BPF_REG_0, -EINVAL, 2),
/* return ALLOW; */
BPF_MOV64_IMM(BPF_REG_0, 1),
BPF_JMP_A(1),
/* else return DENY; */
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_EXIT_INSN(),
},
.attach_type = BPF_CGROUP_SYSCTL,
.sysctl = "net/ipv4/route/mtu_expires",
.open_flags = O_RDONLY,
.result = SUCCESS,
},
{
"bpf_strtoul negative number, EINVAL",
.insns = {
/* arg1 (buf) */
BPF_MOV64_REG(BPF_REG_7, BPF_REG_10),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_7, -8),
BPF_MOV64_IMM(BPF_REG_0, 0x00362d0a), /* " -6\0" */
BPF_STX_MEM(BPF_DW, BPF_REG_7, BPF_REG_0, 0),
BPF_MOV64_REG(BPF_REG_1, BPF_REG_7),
/* arg2 (buf_len) */
BPF_MOV64_IMM(BPF_REG_2, 4),
/* arg3 (flags) */
BPF_MOV64_IMM(BPF_REG_3, 0),
/* arg4 (res) */
BPF_ALU64_IMM(BPF_ADD, BPF_REG_7, -8),
BPF_STX_MEM(BPF_DW, BPF_REG_7, BPF_REG_0, 0),
BPF_MOV64_REG(BPF_REG_4, BPF_REG_7),
BPF_EMIT_CALL(BPF_FUNC_strtoul),
/* if (ret == expected) */
BPF_JMP_IMM(BPF_JNE, BPF_REG_0, -EINVAL, 2),
/* return ALLOW; */
BPF_MOV64_IMM(BPF_REG_0, 1),
BPF_JMP_A(1),
/* else return DENY; */
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_EXIT_INSN(),
},
.attach_type = BPF_CGROUP_SYSCTL,
.sysctl = "net/ipv4/route/mtu_expires",
.open_flags = O_RDONLY,
.result = SUCCESS,
},
{
"bpf_strtol negative number, ok",
.insns = {
/* arg1 (buf) */
BPF_MOV64_REG(BPF_REG_7, BPF_REG_10),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_7, -8),
BPF_MOV64_IMM(BPF_REG_0, 0x00362d0a), /* " -6\0" */
BPF_STX_MEM(BPF_DW, BPF_REG_7, BPF_REG_0, 0),
BPF_MOV64_REG(BPF_REG_1, BPF_REG_7),
/* arg2 (buf_len) */
BPF_MOV64_IMM(BPF_REG_2, 4),
/* arg3 (flags) */
BPF_MOV64_IMM(BPF_REG_3, 10),
/* arg4 (res) */
BPF_ALU64_IMM(BPF_ADD, BPF_REG_7, -8),
BPF_STX_MEM(BPF_DW, BPF_REG_7, BPF_REG_0, 0),
BPF_MOV64_REG(BPF_REG_4, BPF_REG_7),
BPF_EMIT_CALL(BPF_FUNC_strtol),
/* if (ret == expected && */
BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 3, 4),
/* res == expected) */
BPF_LDX_MEM(BPF_DW, BPF_REG_9, BPF_REG_7, 0),
BPF_JMP_IMM(BPF_JNE, BPF_REG_9, -6, 2),
/* return ALLOW; */
BPF_MOV64_IMM(BPF_REG_0, 1),
BPF_JMP_A(1),
/* else return DENY; */
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_EXIT_INSN(),
},
.attach_type = BPF_CGROUP_SYSCTL,
.sysctl = "net/ipv4/route/mtu_expires",
.open_flags = O_RDONLY,
.result = SUCCESS,
},
{
"bpf_strtol hex number, ok",
.insns = {
/* arg1 (buf) */
BPF_MOV64_REG(BPF_REG_7, BPF_REG_10),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_7, -8),
BPF_MOV64_IMM(BPF_REG_0, 0x65667830), /* "0xfe" */
BPF_STX_MEM(BPF_DW, BPF_REG_7, BPF_REG_0, 0),
BPF_MOV64_REG(BPF_REG_1, BPF_REG_7),
/* arg2 (buf_len) */
BPF_MOV64_IMM(BPF_REG_2, 4),
/* arg3 (flags) */
BPF_MOV64_IMM(BPF_REG_3, 0),
/* arg4 (res) */
BPF_ALU64_IMM(BPF_ADD, BPF_REG_7, -8),
BPF_STX_MEM(BPF_DW, BPF_REG_7, BPF_REG_0, 0),
BPF_MOV64_REG(BPF_REG_4, BPF_REG_7),
BPF_EMIT_CALL(BPF_FUNC_strtol),
/* if (ret == expected && */
BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 4, 4),
/* res == expected) */
BPF_LDX_MEM(BPF_DW, BPF_REG_9, BPF_REG_7, 0),
BPF_JMP_IMM(BPF_JNE, BPF_REG_9, 254, 2),
/* return ALLOW; */
BPF_MOV64_IMM(BPF_REG_0, 1),
BPF_JMP_A(1),
/* else return DENY; */
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_EXIT_INSN(),
},
.attach_type = BPF_CGROUP_SYSCTL,
.sysctl = "net/ipv4/route/mtu_expires",
.open_flags = O_RDONLY,
.result = SUCCESS,
},
{
"bpf_strtol max long",
.insns = {
/* arg1 (buf) 9223372036854775807 */
BPF_MOV64_REG(BPF_REG_7, BPF_REG_10),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_7, -24),
BPF_LD_IMM64(BPF_REG_0, 0x3032373333323239ULL),
BPF_STX_MEM(BPF_DW, BPF_REG_7, BPF_REG_0, 0),
BPF_LD_IMM64(BPF_REG_0, 0x3537373435383633ULL),
BPF_STX_MEM(BPF_DW, BPF_REG_7, BPF_REG_0, 8),
BPF_LD_IMM64(BPF_REG_0, 0x0000000000373038ULL),
BPF_STX_MEM(BPF_DW, BPF_REG_7, BPF_REG_0, 16),
BPF_MOV64_REG(BPF_REG_1, BPF_REG_7),
/* arg2 (buf_len) */
BPF_MOV64_IMM(BPF_REG_2, 19),
/* arg3 (flags) */
BPF_MOV64_IMM(BPF_REG_3, 0),
/* arg4 (res) */
BPF_ALU64_IMM(BPF_ADD, BPF_REG_7, -8),
BPF_STX_MEM(BPF_DW, BPF_REG_7, BPF_REG_0, 0),
BPF_MOV64_REG(BPF_REG_4, BPF_REG_7),
BPF_EMIT_CALL(BPF_FUNC_strtol),
/* if (ret == expected && */
BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 19, 6),
/* res == expected) */
BPF_LD_IMM64(BPF_REG_8, 0x7fffffffffffffffULL),
BPF_LDX_MEM(BPF_DW, BPF_REG_9, BPF_REG_7, 0),
BPF_JMP_REG(BPF_JNE, BPF_REG_8, BPF_REG_9, 2),
/* return ALLOW; */
BPF_MOV64_IMM(BPF_REG_0, 1),
BPF_JMP_A(1),
/* else return DENY; */
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_EXIT_INSN(),
},
.attach_type = BPF_CGROUP_SYSCTL,
.sysctl = "net/ipv4/route/mtu_expires",
.open_flags = O_RDONLY,
.result = SUCCESS,
},
{
"bpf_strtol overflow, ERANGE",
.insns = {
/* arg1 (buf) 9223372036854775808 */
BPF_MOV64_REG(BPF_REG_7, BPF_REG_10),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_7, -24),
BPF_LD_IMM64(BPF_REG_0, 0x3032373333323239ULL),
BPF_STX_MEM(BPF_DW, BPF_REG_7, BPF_REG_0, 0),
BPF_LD_IMM64(BPF_REG_0, 0x3537373435383633ULL),
BPF_STX_MEM(BPF_DW, BPF_REG_7, BPF_REG_0, 8),
BPF_LD_IMM64(BPF_REG_0, 0x0000000000383038ULL),
BPF_STX_MEM(BPF_DW, BPF_REG_7, BPF_REG_0, 16),
BPF_MOV64_REG(BPF_REG_1, BPF_REG_7),
/* arg2 (buf_len) */
BPF_MOV64_IMM(BPF_REG_2, 19),
/* arg3 (flags) */
BPF_MOV64_IMM(BPF_REG_3, 0),
/* arg4 (res) */
BPF_ALU64_IMM(BPF_ADD, BPF_REG_7, -8),
BPF_STX_MEM(BPF_DW, BPF_REG_7, BPF_REG_0, 0),
BPF_MOV64_REG(BPF_REG_4, BPF_REG_7),
BPF_EMIT_CALL(BPF_FUNC_strtol),
/* if (ret == expected) */
BPF_JMP_IMM(BPF_JNE, BPF_REG_0, -ERANGE, 2),
/* return ALLOW; */
BPF_MOV64_IMM(BPF_REG_0, 1),
BPF_JMP_A(1),
/* else return DENY; */
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_EXIT_INSN(),
},
.attach_type = BPF_CGROUP_SYSCTL,
.sysctl = "net/ipv4/route/mtu_expires",
.open_flags = O_RDONLY,
.result = SUCCESS,
},
};
static size_t probe_prog_length(const struct bpf_insn *fp)