Quelle  atomic_fetch.c   Sprache: C

{
 "atomic dw/fetch and address leakage of (map ptr & -1) via stack slot",
 .insns = {
  BPF_LD_IMM64(BPF_REG_1, -1),
  BPF_LD_MAP_FD(BPF_REG_8, 0),
  BPF_LD_MAP_FD(BPF_REG_9, 0),
  BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
  BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -8),
  BPF_STX_MEM(BPF_DW, BPF_REG_2, BPF_REG_9, 0),
  BPF_ATOMIC_OP(BPF_DW, BPF_AND | BPF_FETCH, BPF_REG_2, BPF_REG_1, 0),
  BPF_LDX_MEM(BPF_DW, BPF_REG_9, BPF_REG_2, 0),
  BPF_ST_MEM(BPF_DW, BPF_REG_2, 0, 0),
  BPF_MOV64_REG(BPF_REG_1, BPF_REG_8),
  BPF_EMIT_CALL(BPF_FUNC_map_lookup_elem),
  BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 1),
  BPF_STX_MEM(BPF_DW, BPF_REG_0, BPF_REG_9, 0),
  BPF_MOV64_IMM(BPF_REG_0, 0),
  BPF_EXIT_INSN(),
 },
 .fixup_map_array_48b = { 2, 4 },
 .result = ACCEPT,
 .result_unpriv = REJECT,
 .errstr_unpriv = "leaking pointer from stack off -8",
},
{
 "atomic dw/fetch and address leakage of (map ptr & -1) via returned value",
 .insns = {
  BPF_LD_IMM64(BPF_REG_1, -1),
  BPF_LD_MAP_FD(BPF_REG_8, 0),
  BPF_LD_MAP_FD(BPF_REG_9, 0),
  BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
  BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -8),
  BPF_STX_MEM(BPF_DW, BPF_REG_2, BPF_REG_9, 0),
  BPF_ATOMIC_OP(BPF_DW, BPF_AND | BPF_FETCH, BPF_REG_2, BPF_REG_1, 0),
  BPF_MOV64_REG(BPF_REG_9, BPF_REG_1),
  BPF_ST_MEM(BPF_DW, BPF_REG_2, 0, 0),
  BPF_MOV64_REG(BPF_REG_1, BPF_REG_8),
  BPF_EMIT_CALL(BPF_FUNC_map_lookup_elem),
  BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 1),
  BPF_STX_MEM(BPF_DW, BPF_REG_0, BPF_REG_9, 0),
  BPF_MOV64_IMM(BPF_REG_0, 0),
  BPF_EXIT_INSN(),
 },
 .fixup_map_array_48b = { 2, 4 },
 .result = ACCEPT,
 .result_unpriv = REJECT,
 .errstr_unpriv = "leaking pointer from stack off -8",
},
{
 "atomic w/fetch and address leakage of (map ptr & -1) via stack slot",
 .insns = {
  BPF_LD_IMM64(BPF_REG_1, -1),
  BPF_LD_MAP_FD(BPF_REG_8, 0),
  BPF_LD_MAP_FD(BPF_REG_9, 0),
  BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
  BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -8),
  BPF_STX_MEM(BPF_DW, BPF_REG_2, BPF_REG_9, 0),
  BPF_ATOMIC_OP(BPF_W, BPF_AND | BPF_FETCH, BPF_REG_2, BPF_REG_1, 0),
  BPF_LDX_MEM(BPF_DW, BPF_REG_9, BPF_REG_2, 0),
  BPF_ST_MEM(BPF_DW, BPF_REG_2, 0, 0),
  BPF_MOV64_REG(BPF_REG_1, BPF_REG_8),
  BPF_EMIT_CALL(BPF_FUNC_map_lookup_elem),
  BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 1),
  BPF_STX_MEM(BPF_DW, BPF_REG_0, BPF_REG_9, 0),
  BPF_MOV64_IMM(BPF_REG_0, 0),
  BPF_EXIT_INSN(),
 },
 .fixup_map_array_48b = { 2, 4 },
 .result = REJECT,
 .errstr = "invalid size of register fill",
},
{
 "atomic w/fetch and address leakage of (map ptr & -1) via returned value",
 .insns = {
  BPF_LD_IMM64(BPF_REG_1, -1),
  BPF_LD_MAP_FD(BPF_REG_8, 0),
  BPF_LD_MAP_FD(BPF_REG_9, 0),
  BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
  BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -8),
  BPF_STX_MEM(BPF_DW, BPF_REG_2, BPF_REG_9, 0),
  BPF_ATOMIC_OP(BPF_W, BPF_AND | BPF_FETCH, BPF_REG_2, BPF_REG_1, 0),
  BPF_MOV64_REG(BPF_REG_9, BPF_REG_1),
  BPF_ST_MEM(BPF_DW, BPF_REG_2, 0, 0),
  BPF_MOV64_REG(BPF_REG_1, BPF_REG_8),
  BPF_EMIT_CALL(BPF_FUNC_map_lookup_elem),
  BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 1),
  BPF_STX_MEM(BPF_DW, BPF_REG_0, BPF_REG_9, 0),
  BPF_MOV64_IMM(BPF_REG_0, 0),
  BPF_EXIT_INSN(),
 },
 .fixup_map_array_48b = { 2, 4 },
 .result = REJECT,
 .errstr = "invalid size of register fill",
},
#define __ATOMIC_FETCH_OP_TEST(src_reg, dst_reg, operand1, op, operand2, expect) \
 {        \
  "atomic fetch " #op ", src=" #dst_reg " dst=" #dst_reg, \
  .insns = {      \
   /* u64 val = operan1; */ \
   BPF_ST_MEM(BPF_DW, BPF_REG_10, -8, operand1), \
   /* u64 old = atomic_fetch_add(&val, operand2); */ \
   BPF_MOV64_REG(dst_reg, BPF_REG_10),  \
   BPF_MOV64_IMM(src_reg, operand2),  \
   BPF_ATOMIC_OP(BPF_DW, op,   \
          dst_reg, src_reg, -8),  \
   /* if (old != operand1) exit(1); */ \
   BPF_JMP_IMM(BPF_JEQ, src_reg, operand1, 2), \
   BPF_MOV64_IMM(BPF_REG_0, 1),   \
   BPF_EXIT_INSN(),    \
   /* if (val != result) exit (2); */ \
   BPF_LDX_MEM(BPF_DW, BPF_REG_1, BPF_REG_10, -8), \
   BPF_JMP_IMM(BPF_JEQ, BPF_REG_1, expect, 2), \
   BPF_MOV64_IMM(BPF_REG_0, 2),   \
   BPF_EXIT_INSN(),    \
   /* exit(0); */ \
   BPF_MOV64_IMM(BPF_REG_0, 0),   \
   BPF_EXIT_INSN(),    \
  },       \
  .result = ACCEPT,     \
 }
__ATOMIC_FETCH_OP_TEST(BPF_REG_1, BPF_REG_2, 1, BPF_ADD | BPF_FETCH, 2, 3),
__ATOMIC_FETCH_OP_TEST(BPF_REG_0, BPF_REG_1, 1, BPF_ADD | BPF_FETCH, 2, 3),
__ATOMIC_FETCH_OP_TEST(BPF_REG_1, BPF_REG_0, 1, BPF_ADD | BPF_FETCH, 2, 3),
__ATOMIC_FETCH_OP_TEST(BPF_REG_2, BPF_REG_3, 1, BPF_ADD | BPF_FETCH, 2, 3),
__ATOMIC_FETCH_OP_TEST(BPF_REG_4, BPF_REG_5, 1, BPF_ADD | BPF_FETCH, 2, 3),
__ATOMIC_FETCH_OP_TEST(BPF_REG_9, BPF_REG_8, 1, BPF_ADD | BPF_FETCH, 2, 3),
__ATOMIC_FETCH_OP_TEST(BPF_REG_1, BPF_REG_2, 0x010, BPF_AND | BPF_FETCH, 0x011, 0x010),
__ATOMIC_FETCH_OP_TEST(BPF_REG_0, BPF_REG_1, 0x010, BPF_AND | BPF_FETCH, 0x011, 0x010),
__ATOMIC_FETCH_OP_TEST(BPF_REG_1, BPF_REG_0, 0x010, BPF_AND | BPF_FETCH, 0x011, 0x010),
__ATOMIC_FETCH_OP_TEST(BPF_REG_2, BPF_REG_3, 0x010, BPF_AND | BPF_FETCH, 0x011, 0x010),
__ATOMIC_FETCH_OP_TEST(BPF_REG_4, BPF_REG_5, 0x010, BPF_AND | BPF_FETCH, 0x011, 0x010),
__ATOMIC_FETCH_OP_TEST(BPF_REG_9, BPF_REG_8, 0x010, BPF_AND | BPF_FETCH, 0x011, 0x010),
__ATOMIC_FETCH_OP_TEST(BPF_REG_1, BPF_REG_2, 0x010, BPF_OR | BPF_FETCH, 0x011, 0x011),
__ATOMIC_FETCH_OP_TEST(BPF_REG_0, BPF_REG_1, 0x010, BPF_OR | BPF_FETCH, 0x011, 0x011),
__ATOMIC_FETCH_OP_TEST(BPF_REG_1, BPF_REG_0, 0x010, BPF_OR | BPF_FETCH, 0x011, 0x011),
__ATOMIC_FETCH_OP_TEST(BPF_REG_2, BPF_REG_3, 0x010, BPF_OR | BPF_FETCH, 0x011, 0x011),
__ATOMIC_FETCH_OP_TEST(BPF_REG_4, BPF_REG_5, 0x010, BPF_OR | BPF_FETCH, 0x011, 0x011),
__ATOMIC_FETCH_OP_TEST(BPF_REG_9, BPF_REG_8, 0x010, BPF_OR | BPF_FETCH, 0x011, 0x011),
__ATOMIC_FETCH_OP_TEST(BPF_REG_1, BPF_REG_2, 0x010, BPF_XOR | BPF_FETCH, 0x011, 0x001),
__ATOMIC_FETCH_OP_TEST(BPF_REG_0, BPF_REG_1, 0x010, BPF_XOR | BPF_FETCH, 0x011, 0x001),
__ATOMIC_FETCH_OP_TEST(BPF_REG_1, BPF_REG_0, 0x010, BPF_XOR | BPF_FETCH, 0x011, 0x001),
__ATOMIC_FETCH_OP_TEST(BPF_REG_2, BPF_REG_3, 0x010, BPF_XOR | BPF_FETCH, 0x011, 0x001),
__ATOMIC_FETCH_OP_TEST(BPF_REG_4, BPF_REG_5, 0x010, BPF_XOR | BPF_FETCH, 0x011, 0x001),
__ATOMIC_FETCH_OP_TEST(BPF_REG_9, BPF_REG_8, 0x010, BPF_XOR | BPF_FETCH, 0x011, 0x001),
__ATOMIC_FETCH_OP_TEST(BPF_REG_1, BPF_REG_2, 0x010, BPF_XCHG, 0x011, 0x011),
__ATOMIC_FETCH_OP_TEST(BPF_REG_0, BPF_REG_1, 0x010, BPF_XCHG, 0x011, 0x011),
__ATOMIC_FETCH_OP_TEST(BPF_REG_1, BPF_REG_0, 0x010, BPF_XCHG, 0x011, 0x011),
__ATOMIC_FETCH_OP_TEST(BPF_REG_2, BPF_REG_3, 0x010, BPF_XCHG, 0x011, 0x011),
__ATOMIC_FETCH_OP_TEST(BPF_REG_4, BPF_REG_5, 0x010, BPF_XCHG, 0x011, 0x011),
__ATOMIC_FETCH_OP_TEST(BPF_REG_9, BPF_REG_8, 0x010, BPF_XCHG, 0x011, 0x011),
#undef __ATOMIC_FETCH_OP_TEST