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

root/tools/testing/selftests/bpf/verifier/wide_access.c
#define BPF_SOCK_ADDR_STORE(field, off, res, err, flgs) \
{ \
        "wide store to bpf_sock_addr." #field "[" #off "]", \
        .insns = { \
        BPF_MOV64_IMM(BPF_REG_0, 1), \
        BPF_STX_MEM(BPF_DW, BPF_REG_1, BPF_REG_0, \
                    offsetof(struct bpf_sock_addr, field[off])), \
        BPF_EXIT_INSN(), \
        }, \
        .result = res, \
        .prog_type = BPF_PROG_TYPE_CGROUP_SOCK_ADDR, \
        .expected_attach_type = BPF_CGROUP_UDP6_SENDMSG, \
        .errstr = err, \
        .flags = flgs, \
}

/* user_ip6[0] is u64 aligned */
BPF_SOCK_ADDR_STORE(user_ip6, 0, ACCEPT,
                    NULL, 0),
BPF_SOCK_ADDR_STORE(user_ip6, 1, REJECT,
                    "invalid bpf_context access off=12 size=8",
                    F_NEEDS_EFFICIENT_UNALIGNED_ACCESS),
BPF_SOCK_ADDR_STORE(user_ip6, 2, ACCEPT,
                    NULL, 0),
BPF_SOCK_ADDR_STORE(user_ip6, 3, REJECT,
                    "invalid bpf_context access off=20 size=8",
                    F_NEEDS_EFFICIENT_UNALIGNED_ACCESS),

/* msg_src_ip6[0] is _not_ u64 aligned */
BPF_SOCK_ADDR_STORE(msg_src_ip6, 0, REJECT,
                    "invalid bpf_context access off=44 size=8",
                    F_NEEDS_EFFICIENT_UNALIGNED_ACCESS),
BPF_SOCK_ADDR_STORE(msg_src_ip6, 1, ACCEPT,
                    NULL, 0),
BPF_SOCK_ADDR_STORE(msg_src_ip6, 2, REJECT,
                    "invalid bpf_context access off=52 size=8",
                    F_NEEDS_EFFICIENT_UNALIGNED_ACCESS),
BPF_SOCK_ADDR_STORE(msg_src_ip6, 3, REJECT,
                    "invalid bpf_context access off=56 size=8", 0),

#undef BPF_SOCK_ADDR_STORE

#define BPF_SOCK_ADDR_LOAD(field, off, res, err, flgs)  \
{ \
        "wide load from bpf_sock_addr." #field "[" #off "]", \
        .insns = { \
        BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_1, \
                    offsetof(struct bpf_sock_addr, field[off])), \
        BPF_MOV64_IMM(BPF_REG_0, 1), \
        BPF_EXIT_INSN(), \
        }, \
        .result = res, \
        .prog_type = BPF_PROG_TYPE_CGROUP_SOCK_ADDR, \
        .expected_attach_type = BPF_CGROUP_UDP6_SENDMSG, \
        .errstr = err, \
        .flags = flgs, \
}

/* user_ip6[0] is u64 aligned */
BPF_SOCK_ADDR_LOAD(user_ip6, 0, ACCEPT,
                   NULL, 0),
BPF_SOCK_ADDR_LOAD(user_ip6, 1, REJECT,
                   "invalid bpf_context access off=12 size=8",
                    F_NEEDS_EFFICIENT_UNALIGNED_ACCESS),
BPF_SOCK_ADDR_LOAD(user_ip6, 2, ACCEPT,
                   NULL, 0),
BPF_SOCK_ADDR_LOAD(user_ip6, 3, REJECT,
                   "invalid bpf_context access off=20 size=8",
                    F_NEEDS_EFFICIENT_UNALIGNED_ACCESS),

/* msg_src_ip6[0] is _not_ u64 aligned */
BPF_SOCK_ADDR_LOAD(msg_src_ip6, 0, REJECT,
                   "invalid bpf_context access off=44 size=8",
                    F_NEEDS_EFFICIENT_UNALIGNED_ACCESS),
BPF_SOCK_ADDR_LOAD(msg_src_ip6, 1, ACCEPT,
                   NULL, 0),
BPF_SOCK_ADDR_LOAD(msg_src_ip6, 2, REJECT,
                   "invalid bpf_context access off=52 size=8",
                    F_NEEDS_EFFICIENT_UNALIGNED_ACCESS),
BPF_SOCK_ADDR_LOAD(msg_src_ip6, 3, REJECT,
                   "invalid bpf_context access off=56 size=8", 0),

#undef BPF_SOCK_ADDR_LOAD
Linux
