linux_dsm_epyc7002/tools/testing/selftests/bpf/verifier/div_overflow.c
Naveen N. Rao 3e06826951 bpf: fix div64 overflow tests to properly detect errors
If the result of the division is LLONG_MIN, current tests do not detect
the error since the return value is truncated to a 32-bit value and ends
up being 0.

Signed-off-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
2019-06-13 23:07:00 +02:00

111 lines
2.5 KiB
C

/* Just make sure that JITs used udiv/umod as otherwise we get
* an exception from INT_MIN/-1 overflow similarly as with div
* by zero.
*/
{
"DIV32 overflow, check 1",
.insns = {
BPF_MOV32_IMM(BPF_REG_1, -1),
BPF_MOV32_IMM(BPF_REG_0, INT_MIN),
BPF_ALU32_REG(BPF_DIV, BPF_REG_0, BPF_REG_1),
BPF_EXIT_INSN(),
},
.prog_type = BPF_PROG_TYPE_SCHED_CLS,
.result = ACCEPT,
.retval = 0,
},
{
"DIV32 overflow, check 2",
.insns = {
BPF_MOV32_IMM(BPF_REG_0, INT_MIN),
BPF_ALU32_IMM(BPF_DIV, BPF_REG_0, -1),
BPF_EXIT_INSN(),
},
.prog_type = BPF_PROG_TYPE_SCHED_CLS,
.result = ACCEPT,
.retval = 0,
},
{
"DIV64 overflow, check 1",
.insns = {
BPF_MOV64_IMM(BPF_REG_1, -1),
BPF_LD_IMM64(BPF_REG_2, LLONG_MIN),
BPF_ALU64_REG(BPF_DIV, BPF_REG_2, BPF_REG_1),
BPF_MOV32_IMM(BPF_REG_0, 0),
BPF_JMP_REG(BPF_JEQ, BPF_REG_0, BPF_REG_2, 1),
BPF_MOV32_IMM(BPF_REG_0, 1),
BPF_EXIT_INSN(),
},
.prog_type = BPF_PROG_TYPE_SCHED_CLS,
.result = ACCEPT,
.retval = 0,
},
{
"DIV64 overflow, check 2",
.insns = {
BPF_LD_IMM64(BPF_REG_1, LLONG_MIN),
BPF_ALU64_IMM(BPF_DIV, BPF_REG_1, -1),
BPF_MOV32_IMM(BPF_REG_0, 0),
BPF_JMP_REG(BPF_JEQ, BPF_REG_0, BPF_REG_1, 1),
BPF_MOV32_IMM(BPF_REG_0, 1),
BPF_EXIT_INSN(),
},
.prog_type = BPF_PROG_TYPE_SCHED_CLS,
.result = ACCEPT,
.retval = 0,
},
{
"MOD32 overflow, check 1",
.insns = {
BPF_MOV32_IMM(BPF_REG_1, -1),
BPF_MOV32_IMM(BPF_REG_0, INT_MIN),
BPF_ALU32_REG(BPF_MOD, BPF_REG_0, BPF_REG_1),
BPF_EXIT_INSN(),
},
.prog_type = BPF_PROG_TYPE_SCHED_CLS,
.result = ACCEPT,
.retval = INT_MIN,
},
{
"MOD32 overflow, check 2",
.insns = {
BPF_MOV32_IMM(BPF_REG_0, INT_MIN),
BPF_ALU32_IMM(BPF_MOD, BPF_REG_0, -1),
BPF_EXIT_INSN(),
},
.prog_type = BPF_PROG_TYPE_SCHED_CLS,
.result = ACCEPT,
.retval = INT_MIN,
},
{
"MOD64 overflow, check 1",
.insns = {
BPF_MOV64_IMM(BPF_REG_1, -1),
BPF_LD_IMM64(BPF_REG_2, LLONG_MIN),
BPF_MOV64_REG(BPF_REG_3, BPF_REG_2),
BPF_ALU64_REG(BPF_MOD, BPF_REG_2, BPF_REG_1),
BPF_MOV32_IMM(BPF_REG_0, 0),
BPF_JMP_REG(BPF_JNE, BPF_REG_3, BPF_REG_2, 1),
BPF_MOV32_IMM(BPF_REG_0, 1),
BPF_EXIT_INSN(),
},
.prog_type = BPF_PROG_TYPE_SCHED_CLS,
.result = ACCEPT,
.retval = 1,
},
{
"MOD64 overflow, check 2",
.insns = {
BPF_LD_IMM64(BPF_REG_2, LLONG_MIN),
BPF_MOV64_REG(BPF_REG_3, BPF_REG_2),
BPF_ALU64_IMM(BPF_MOD, BPF_REG_2, -1),
BPF_MOV32_IMM(BPF_REG_0, 0),
BPF_JMP_REG(BPF_JNE, BPF_REG_3, BPF_REG_2, 1),
BPF_MOV32_IMM(BPF_REG_0, 1),
BPF_EXIT_INSN(),
},
.prog_type = BPF_PROG_TYPE_SCHED_CLS,
.result = ACCEPT,
.retval = 1,
},