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

   1 #define BPF_SOCK_ADDR_STORE(field, off, res, err, flgs) \
   2 { \
   3         "wide store to bpf_sock_addr." #field "[" #off "]", \
   4         .insns = { \
   5         BPF_MOV64_IMM(BPF_REG_0, 1), \
   6         BPF_STX_MEM(BPF_DW, BPF_REG_1, BPF_REG_0, \
   7                     offsetof(struct bpf_sock_addr, field[off])), \
   8         BPF_EXIT_INSN(), \
   9         }, \
  10         .result = res, \
  11         .prog_type = BPF_PROG_TYPE_CGROUP_SOCK_ADDR, \
  12         .expected_attach_type = BPF_CGROUP_UDP6_SENDMSG, \
  13         .errstr = err, \
  14         .flags = flgs, \
  15 }
  16
  17 /* user_ip6[0] is u64 aligned */
  18 BPF_SOCK_ADDR_STORE(user_ip6, 0, ACCEPT,
  19                     NULL, 0),
  20 BPF_SOCK_ADDR_STORE(user_ip6, 1, REJECT,
  21                     "invalid bpf_context access off=12 size=8",
  22                     F_NEEDS_EFFICIENT_UNALIGNED_ACCESS),
  23 BPF_SOCK_ADDR_STORE(user_ip6, 2, ACCEPT,
  24                     NULL, 0),
  25 BPF_SOCK_ADDR_STORE(user_ip6, 3, REJECT,
  26                     "invalid bpf_context access off=20 size=8",
  27                     F_NEEDS_EFFICIENT_UNALIGNED_ACCESS),
  28
  29 /* msg_src_ip6[0] is _not_ u64 aligned */
  30 BPF_SOCK_ADDR_STORE(msg_src_ip6, 0, REJECT,
  31                     "invalid bpf_context access off=44 size=8",
  32                     F_NEEDS_EFFICIENT_UNALIGNED_ACCESS),
  33 BPF_SOCK_ADDR_STORE(msg_src_ip6, 1, ACCEPT,
  34                     NULL, 0),
  35 BPF_SOCK_ADDR_STORE(msg_src_ip6, 2, REJECT,
  36                     "invalid bpf_context access off=52 size=8",
  37                     F_NEEDS_EFFICIENT_UNALIGNED_ACCESS),
  38 BPF_SOCK_ADDR_STORE(msg_src_ip6, 3, REJECT,
  39                     "invalid bpf_context access off=56 size=8", 0),
  40
  41 #undef BPF_SOCK_ADDR_STORE
  42
  43 #define BPF_SOCK_ADDR_LOAD(field, off, res, err, flgs)  \
  44 { \
  45         "wide load from bpf_sock_addr." #field "[" #off "]", \
  46         .insns = { \
  47         BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_1, \
  48                     offsetof(struct bpf_sock_addr, field[off])), \
  49         BPF_MOV64_IMM(BPF_REG_0, 1), \
  50         BPF_EXIT_INSN(), \
  51         }, \
  52         .result = res, \
  53         .prog_type = BPF_PROG_TYPE_CGROUP_SOCK_ADDR, \
  54         .expected_attach_type = BPF_CGROUP_UDP6_SENDMSG, \
  55         .errstr = err, \
  56         .flags = flgs, \
  57 }
  58
  59 /* user_ip6[0] is u64 aligned */
  60 BPF_SOCK_ADDR_LOAD(user_ip6, 0, ACCEPT,
  61                    NULL, 0),
  62 BPF_SOCK_ADDR_LOAD(user_ip6, 1, REJECT,
  63                    "invalid bpf_context access off=12 size=8",
  64                     F_NEEDS_EFFICIENT_UNALIGNED_ACCESS),
  65 BPF_SOCK_ADDR_LOAD(user_ip6, 2, ACCEPT,
  66                    NULL, 0),
  67 BPF_SOCK_ADDR_LOAD(user_ip6, 3, REJECT,
  68                    "invalid bpf_context access off=20 size=8",
  69                     F_NEEDS_EFFICIENT_UNALIGNED_ACCESS),
  70
  71 /* msg_src_ip6[0] is _not_ u64 aligned */
  72 BPF_SOCK_ADDR_LOAD(msg_src_ip6, 0, REJECT,
  73                    "invalid bpf_context access off=44 size=8",
  74                     F_NEEDS_EFFICIENT_UNALIGNED_ACCESS),
  75 BPF_SOCK_ADDR_LOAD(msg_src_ip6, 1, ACCEPT,
  76                    NULL, 0),
  77 BPF_SOCK_ADDR_LOAD(msg_src_ip6, 2, REJECT,
  78                    "invalid bpf_context access off=52 size=8",
  79                     F_NEEDS_EFFICIENT_UNALIGNED_ACCESS),
  80 BPF_SOCK_ADDR_LOAD(msg_src_ip6, 3, REJECT,
  81                    "invalid bpf_context access off=56 size=8", 0),
  82
  83 #undef BPF_SOCK_ADDR_LOAD