tools/testing/selftests/bpf/verifier/map_ptr_mixing.c

   1 {
   2         "calls: two calls returning different map pointers for lookup (hash, array)",
   3         .insns = {
   4         /* main prog */
   5         BPF_JMP_IMM(BPF_JNE, BPF_REG_1, 0, 2),
   6         BPF_CALL_REL(11),
   7         BPF_JMP_IMM(BPF_JA, 0, 0, 1),
   8         BPF_CALL_REL(12),
   9         BPF_MOV64_REG(BPF_REG_1, BPF_REG_0),
  10         BPF_ST_MEM(BPF_DW, BPF_REG_10, -8, 0),
  11         BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
  12         BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -8),
  13         BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_map_lookup_elem),
  14         BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 2),
  15         BPF_ST_MEM(BPF_DW, BPF_REG_0, 0, offsetof(struct test_val, foo)),
  16         BPF_MOV64_IMM(BPF_REG_0, 1),
  17         BPF_EXIT_INSN(),
  18         /* subprog 1 */
  19         BPF_LD_MAP_FD(BPF_REG_0, 0),
  20         BPF_EXIT_INSN(),
  21         /* subprog 2 */
  22         BPF_LD_MAP_FD(BPF_REG_0, 0),
  23         BPF_EXIT_INSN(),
  24         },
  25         .prog_type = BPF_PROG_TYPE_SCHED_CLS,
  26         .fixup_map_hash_48b = { 13 },
  27         .fixup_map_array_48b = { 16 },
  28         .result = ACCEPT,
  29         .retval = 1,
  30 },
  31 {
  32         "calls: two calls returning different map pointers for lookup (hash, map in map)",
  33         .insns = {
  34         /* main prog */
  35         BPF_JMP_IMM(BPF_JNE, BPF_REG_1, 0, 2),
  36         BPF_CALL_REL(11),
  37         BPF_JMP_IMM(BPF_JA, 0, 0, 1),
  38         BPF_CALL_REL(12),
  39         BPF_MOV64_REG(BPF_REG_1, BPF_REG_0),
  40         BPF_ST_MEM(BPF_DW, BPF_REG_10, -8, 0),
  41         BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
  42         BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -8),
  43         BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_map_lookup_elem),
  44         BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 2),
  45         BPF_ST_MEM(BPF_DW, BPF_REG_0, 0, offsetof(struct test_val, foo)),
  46         BPF_MOV64_IMM(BPF_REG_0, 1),
  47         BPF_EXIT_INSN(),
  48         /* subprog 1 */
  49         BPF_LD_MAP_FD(BPF_REG_0, 0),
  50         BPF_EXIT_INSN(),
  51         /* subprog 2 */
  52         BPF_LD_MAP_FD(BPF_REG_0, 0),
  53         BPF_EXIT_INSN(),
  54         },
  55         .prog_type = BPF_PROG_TYPE_SCHED_CLS,
  56         .fixup_map_in_map = { 16 },
  57         .fixup_map_array_48b = { 13 },
  58         .result = REJECT,
  59         .errstr = "only read from bpf_array is supported",
  60 },
  61 {
  62         "cond: two branches returning different map pointers for lookup (tail, tail)",
  63         .insns = {
  64         BPF_LDX_MEM(BPF_W, BPF_REG_6, BPF_REG_1,
  65                     offsetof(struct __sk_buff, mark)),
  66         BPF_JMP_IMM(BPF_JNE, BPF_REG_6, 0, 3),
  67         BPF_LD_MAP_FD(BPF_REG_2, 0),
  68         BPF_JMP_IMM(BPF_JA, 0, 0, 2),
  69         BPF_LD_MAP_FD(BPF_REG_2, 0),
  70         BPF_MOV64_IMM(BPF_REG_3, 7),
  71         BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_tail_call),
  72         BPF_MOV64_IMM(BPF_REG_0, 1),
  73         BPF_EXIT_INSN(),
  74         },
  75         .fixup_prog1 = { 5 },
  76         .fixup_prog2 = { 2 },
  77         .result_unpriv = REJECT,
  78         .errstr_unpriv = "tail_call abusing map_ptr",
  79         .result = ACCEPT,
  80         .retval = 42,
  81 },
  82 {
  83         "cond: two branches returning same map pointers for lookup (tail, tail)",
  84         .insns = {
  85         BPF_LDX_MEM(BPF_W, BPF_REG_6, BPF_REG_1,
  86                     offsetof(struct __sk_buff, mark)),
  87         BPF_JMP_IMM(BPF_JEQ, BPF_REG_6, 0, 3),
  88         BPF_LD_MAP_FD(BPF_REG_2, 0),
  89         BPF_JMP_IMM(BPF_JA, 0, 0, 2),
  90         BPF_LD_MAP_FD(BPF_REG_2, 0),
  91         BPF_MOV64_IMM(BPF_REG_3, 7),
  92         BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_tail_call),
  93         BPF_MOV64_IMM(BPF_REG_0, 1),
  94         BPF_EXIT_INSN(),
  95         },
  96         .fixup_prog2 = { 2, 5 },
  97         .result_unpriv = ACCEPT,
  98         .result = ACCEPT,
  99         .retval = 42,
 100 },