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Diffstat (limited to 'tools/testing/selftests/bpf/verifier/div_overflow.c')
-rw-r--r--tools/testing/selftests/bpf/verifier/div_overflow.c104
1 files changed, 104 insertions, 0 deletions
diff --git a/tools/testing/selftests/bpf/verifier/div_overflow.c b/tools/testing/selftests/bpf/verifier/div_overflow.c
new file mode 100644
index 000000000000..bd3f38dbe796
--- /dev/null
+++ b/tools/testing/selftests/bpf/verifier/div_overflow.c
@@ -0,0 +1,104 @@
+/* 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_0, LLONG_MIN),
+ BPF_ALU64_REG(BPF_DIV, BPF_REG_0, BPF_REG_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_0, LLONG_MIN),
+ BPF_ALU64_IMM(BPF_DIV, 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,
+},