bpf: Add MEM_RDONLY for helper args that are pointers to rdonly mem.

Some helper functions may modify its arguments, for example,
bpf_d_path, bpf_get_stack etc. Previously, their argument types
were marked as ARG_PTR_TO_MEM, which is compatible with read-only
mem types, such as PTR_TO_RDONLY_BUF. Therefore it's legitimate,
but technically incorrect, to modify a read-only memory by passing
it into one of such helper functions.

This patch tags the bpf_args compatible with immutable memory with
MEM_RDONLY flag. The arguments that don't have this flag will be
only compatible with mutable memory types, preventing the helper
from modifying a read-only memory. The bpf_args that have
MEM_RDONLY are compatible with both mutable memory and immutable
memory.

Signed-off-by: Hao Luo <haoluo@google.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20211217003152.48334-9-haoluo@google.com

diff --git a/include/linux/bpf.h b/include/linux/bpf.h
index 567d83b..2675313 100644 (file)
--- a/include/linux/bpf.h
+++ b/include/linux/bpf.h
@@ -311,7 +311,9 @@ enum bpf_type_flag {
        /* PTR may be NULL. */
        PTR_MAYBE_NULL          = BIT(0 + BPF_BASE_TYPE_BITS),
 
-       /* MEM is read-only. */
+       /* MEM is read-only. When applied on bpf_arg, it indicates the arg is
+        * compatible with both mutable and immutable memory.
+        */
        MEM_RDONLY              = BIT(1 + BPF_BASE_TYPE_BITS),
 
        __BPF_TYPE_LAST_FLAG    = MEM_RDONLY,

diff --git a/kernel/bpf/btf.c b/kernel/bpf/btf.c
index d948b5b..b3fddfb 100644 (file)
--- a/kernel/bpf/btf.c
+++ b/kernel/bpf/btf.c
@@ -6353,7 +6353,7 @@ const struct bpf_func_proto bpf_btf_find_by_name_kind_proto = {
        .func           = bpf_btf_find_by_name_kind,
        .gpl_only       = false,
        .ret_type       = RET_INTEGER,
-       .arg1_type      = ARG_PTR_TO_MEM,
+       .arg1_type      = ARG_PTR_TO_MEM | MEM_RDONLY,
        .arg2_type      = ARG_CONST_SIZE,
        .arg3_type      = ARG_ANYTHING,
        .arg4_type      = ARG_ANYTHING,

diff --git a/kernel/bpf/cgroup.c b/kernel/bpf/cgroup.c
index 43eb350..514b468 100644 (file)
--- a/kernel/bpf/cgroup.c
+++ b/kernel/bpf/cgroup.c
@@ -1789,7 +1789,7 @@ static const struct bpf_func_proto bpf_sysctl_set_new_value_proto = {
        .gpl_only       = false,
        .ret_type       = RET_INTEGER,
        .arg1_type      = ARG_PTR_TO_CTX,
-       .arg2_type      = ARG_PTR_TO_MEM,
+       .arg2_type      = ARG_PTR_TO_MEM | MEM_RDONLY,
        .arg3_type      = ARG_CONST_SIZE,
 };
 

diff --git a/kernel/bpf/helpers.c b/kernel/bpf/helpers.c
index 6a65e2a..01cfdf4 100644 (file)
--- a/kernel/bpf/helpers.c
+++ b/kernel/bpf/helpers.c
@@ -531,7 +531,7 @@ const struct bpf_func_proto bpf_strtol_proto = {
        .func           = bpf_strtol,
        .gpl_only       = false,
        .ret_type       = RET_INTEGER,
-       .arg1_type      = ARG_PTR_TO_MEM,
+       .arg1_type      = ARG_PTR_TO_MEM | MEM_RDONLY,
        .arg2_type      = ARG_CONST_SIZE,
        .arg3_type      = ARG_ANYTHING,
        .arg4_type      = ARG_PTR_TO_LONG,
@@ -559,7 +559,7 @@ const struct bpf_func_proto bpf_strtoul_proto = {
        .func           = bpf_strtoul,
        .gpl_only       = false,
        .ret_type       = RET_INTEGER,
-       .arg1_type      = ARG_PTR_TO_MEM,
+       .arg1_type      = ARG_PTR_TO_MEM | MEM_RDONLY,
        .arg2_type      = ARG_CONST_SIZE,
        .arg3_type      = ARG_ANYTHING,
        .arg4_type      = ARG_PTR_TO_LONG,
@@ -645,7 +645,7 @@ const struct bpf_func_proto bpf_event_output_data_proto =  {
        .arg1_type      = ARG_PTR_TO_CTX,
        .arg2_type      = ARG_CONST_MAP_PTR,
        .arg3_type      = ARG_ANYTHING,
-       .arg4_type      = ARG_PTR_TO_MEM,
+       .arg4_type      = ARG_PTR_TO_MEM | MEM_RDONLY,
        .arg5_type      = ARG_CONST_SIZE_OR_ZERO,
 };
 
@@ -1026,7 +1026,7 @@ const struct bpf_func_proto bpf_snprintf_proto = {
        .arg1_type      = ARG_PTR_TO_MEM_OR_NULL,
        .arg2_type      = ARG_CONST_SIZE_OR_ZERO,
        .arg3_type      = ARG_PTR_TO_CONST_STR,
-       .arg4_type      = ARG_PTR_TO_MEM_OR_NULL,
+       .arg4_type      = ARG_PTR_TO_MEM | PTR_MAYBE_NULL | MEM_RDONLY,
        .arg5_type      = ARG_CONST_SIZE_OR_ZERO,
 };
 

diff --git a/kernel/bpf/ringbuf.c b/kernel/bpf/ringbuf.c
index 9e0c10c..638d7fd 100644 (file)
--- a/kernel/bpf/ringbuf.c
+++ b/kernel/bpf/ringbuf.c
@@ -444,7 +444,7 @@ const struct bpf_func_proto bpf_ringbuf_output_proto = {
        .func           = bpf_ringbuf_output,
        .ret_type       = RET_INTEGER,
        .arg1_type      = ARG_CONST_MAP_PTR,
-       .arg2_type      = ARG_PTR_TO_MEM,
+       .arg2_type      = ARG_PTR_TO_MEM | MEM_RDONLY,
        .arg3_type      = ARG_CONST_SIZE_OR_ZERO,
        .arg4_type      = ARG_ANYTHING,
 };

diff --git a/kernel/bpf/syscall.c b/kernel/bpf/syscall.c
index da07bdf..fa4505f 100644 (file)
--- a/kernel/bpf/syscall.c
+++ b/kernel/bpf/syscall.c
@@ -4773,7 +4773,7 @@ static const struct bpf_func_proto bpf_sys_bpf_proto = {
        .gpl_only       = false,
        .ret_type       = RET_INTEGER,
        .arg1_type      = ARG_ANYTHING,
-       .arg2_type      = ARG_PTR_TO_MEM,
+       .arg2_type      = ARG_PTR_TO_MEM | MEM_RDONLY,
        .arg3_type      = ARG_CONST_SIZE,
 };
 

diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c
index f49b3d3..ca5cd0d 100644 (file)
--- a/kernel/bpf/verifier.c
+++ b/kernel/bpf/verifier.c
@@ -5113,7 +5113,6 @@ static const struct bpf_reg_types mem_types = {
                PTR_TO_MAP_VALUE,
                PTR_TO_MEM,
                PTR_TO_BUF,
-               PTR_TO_BUF | MEM_RDONLY,
        },
 };
 
@@ -5183,6 +5182,21 @@ static int check_reg_type(struct bpf_verifier_env *env, u32 regno,
                return -EFAULT;
        }
 
+       /* ARG_PTR_TO_MEM + RDONLY is compatible with PTR_TO_MEM and PTR_TO_MEM + RDONLY,
+        * but ARG_PTR_TO_MEM is compatible only with PTR_TO_MEM and NOT with PTR_TO_MEM + RDONLY
+        *
+        * Same for MAYBE_NULL:
+        *
+        * ARG_PTR_TO_MEM + MAYBE_NULL is compatible with PTR_TO_MEM and PTR_TO_MEM + MAYBE_NULL,
+        * but ARG_PTR_TO_MEM is compatible only with PTR_TO_MEM but NOT with PTR_TO_MEM + MAYBE_NULL
+        *
+        * Therefore we fold these flags depending on the arg_type before comparison.
+        */
+       if (arg_type & MEM_RDONLY)
+               type &= ~MEM_RDONLY;
+       if (arg_type & PTR_MAYBE_NULL)
+               type &= ~PTR_MAYBE_NULL;
+
        for (i = 0; i < ARRAY_SIZE(compatible->types); i++) {
                expected = compatible->types[i];
                if (expected == NOT_INIT)
@@ -5192,14 +5206,14 @@ static int check_reg_type(struct bpf_verifier_env *env, u32 regno,
                        goto found;
        }
 
-       verbose(env, "R%d type=%s expected=", regno, reg_type_str(env, type));
+       verbose(env, "R%d type=%s expected=", regno, reg_type_str(env, reg->type));
        for (j = 0; j + 1 < i; j++)
                verbose(env, "%s, ", reg_type_str(env, compatible->types[j]));
        verbose(env, "%s\n", reg_type_str(env, compatible->types[j]));
        return -EACCES;
 
 found:
-       if (type == PTR_TO_BTF_ID) {
+       if (reg->type == PTR_TO_BTF_ID) {
                if (!arg_btf_id) {
                        if (!compatible->btf_id) {
                                verbose(env, "verifier internal error: missing arg compatible BTF ID\n");

diff --git a/kernel/trace/bpf_trace.c b/kernel/trace/bpf_trace.c
index cea2ca6..21aa306 100644 (file)
--- a/kernel/trace/bpf_trace.c
+++ b/kernel/trace/bpf_trace.c
@@ -345,7 +345,7 @@ static const struct bpf_func_proto bpf_probe_write_user_proto = {
        .gpl_only       = true,
        .ret_type       = RET_INTEGER,
        .arg1_type      = ARG_ANYTHING,
-       .arg2_type      = ARG_PTR_TO_MEM,
+       .arg2_type      = ARG_PTR_TO_MEM | MEM_RDONLY,
        .arg3_type      = ARG_CONST_SIZE,
 };
 
@@ -394,7 +394,7 @@ static const struct bpf_func_proto bpf_trace_printk_proto = {
        .func           = bpf_trace_printk,
        .gpl_only       = true,
        .ret_type       = RET_INTEGER,
-       .arg1_type      = ARG_PTR_TO_MEM,
+       .arg1_type      = ARG_PTR_TO_MEM | MEM_RDONLY,
        .arg2_type      = ARG_CONST_SIZE,
 };
 
@@ -450,9 +450,9 @@ static const struct bpf_func_proto bpf_trace_vprintk_proto = {
        .func           = bpf_trace_vprintk,
        .gpl_only       = true,
        .ret_type       = RET_INTEGER,
-       .arg1_type      = ARG_PTR_TO_MEM,
+       .arg1_type      = ARG_PTR_TO_MEM | MEM_RDONLY,
        .arg2_type      = ARG_CONST_SIZE,
-       .arg3_type      = ARG_PTR_TO_MEM_OR_NULL,
+       .arg3_type      = ARG_PTR_TO_MEM | PTR_MAYBE_NULL | MEM_RDONLY,
        .arg4_type      = ARG_CONST_SIZE_OR_ZERO,
 };
 
@@ -492,9 +492,9 @@ static const struct bpf_func_proto bpf_seq_printf_proto = {
        .ret_type       = RET_INTEGER,
        .arg1_type      = ARG_PTR_TO_BTF_ID,
        .arg1_btf_id    = &btf_seq_file_ids[0],
-       .arg2_type      = ARG_PTR_TO_MEM,
+       .arg2_type      = ARG_PTR_TO_MEM | MEM_RDONLY,
        .arg3_type      = ARG_CONST_SIZE,
-       .arg4_type      = ARG_PTR_TO_MEM_OR_NULL,
+       .arg4_type      = ARG_PTR_TO_MEM | PTR_MAYBE_NULL | MEM_RDONLY,
        .arg5_type      = ARG_CONST_SIZE_OR_ZERO,
 };
 
@@ -509,7 +509,7 @@ static const struct bpf_func_proto bpf_seq_write_proto = {
        .ret_type       = RET_INTEGER,
        .arg1_type      = ARG_PTR_TO_BTF_ID,
        .arg1_btf_id    = &btf_seq_file_ids[0],
-       .arg2_type      = ARG_PTR_TO_MEM,
+       .arg2_type      = ARG_PTR_TO_MEM | MEM_RDONLY,
        .arg3_type      = ARG_CONST_SIZE_OR_ZERO,
 };
 
@@ -533,7 +533,7 @@ static const struct bpf_func_proto bpf_seq_printf_btf_proto = {
        .ret_type       = RET_INTEGER,
        .arg1_type      = ARG_PTR_TO_BTF_ID,
        .arg1_btf_id    = &btf_seq_file_ids[0],
-       .arg2_type      = ARG_PTR_TO_MEM,
+       .arg2_type      = ARG_PTR_TO_MEM | MEM_RDONLY,
        .arg3_type      = ARG_CONST_SIZE_OR_ZERO,
        .arg4_type      = ARG_ANYTHING,
 };
@@ -694,7 +694,7 @@ static const struct bpf_func_proto bpf_perf_event_output_proto = {
        .arg1_type      = ARG_PTR_TO_CTX,
        .arg2_type      = ARG_CONST_MAP_PTR,
        .arg3_type      = ARG_ANYTHING,
-       .arg4_type      = ARG_PTR_TO_MEM,
+       .arg4_type      = ARG_PTR_TO_MEM | MEM_RDONLY,
        .arg5_type      = ARG_CONST_SIZE_OR_ZERO,
 };
 
@@ -1004,7 +1004,7 @@ const struct bpf_func_proto bpf_snprintf_btf_proto = {
        .ret_type       = RET_INTEGER,
        .arg1_type      = ARG_PTR_TO_MEM,
        .arg2_type      = ARG_CONST_SIZE,
-       .arg3_type      = ARG_PTR_TO_MEM,
+       .arg3_type      = ARG_PTR_TO_MEM | MEM_RDONLY,
        .arg4_type      = ARG_CONST_SIZE,
        .arg5_type      = ARG_ANYTHING,
 };
@@ -1334,7 +1334,7 @@ static const struct bpf_func_proto bpf_perf_event_output_proto_tp = {
        .arg1_type      = ARG_PTR_TO_CTX,
        .arg2_type      = ARG_CONST_MAP_PTR,
        .arg3_type      = ARG_ANYTHING,
-       .arg4_type      = ARG_PTR_TO_MEM,
+       .arg4_type      = ARG_PTR_TO_MEM | MEM_RDONLY,
        .arg5_type      = ARG_CONST_SIZE_OR_ZERO,
 };
 
@@ -1556,7 +1556,7 @@ static const struct bpf_func_proto bpf_perf_event_output_proto_raw_tp = {
        .arg1_type      = ARG_PTR_TO_CTX,
        .arg2_type      = ARG_CONST_MAP_PTR,
        .arg3_type      = ARG_ANYTHING,
-       .arg4_type      = ARG_PTR_TO_MEM,
+       .arg4_type      = ARG_PTR_TO_MEM | MEM_RDONLY,
        .arg5_type      = ARG_CONST_SIZE_OR_ZERO,
 };
 
@@ -1610,7 +1610,7 @@ static const struct bpf_func_proto bpf_get_stack_proto_raw_tp = {
        .gpl_only       = true,
        .ret_type       = RET_INTEGER,
        .arg1_type      = ARG_PTR_TO_CTX,
-       .arg2_type      = ARG_PTR_TO_MEM,
+       .arg2_type      = ARG_PTR_TO_MEM | MEM_RDONLY,
        .arg3_type      = ARG_CONST_SIZE_OR_ZERO,
        .arg4_type      = ARG_ANYTHING,
 };

diff --git a/net/core/filter.c b/net/core/filter.c
index 3f65639..606ab5a 100644 (file)
--- a/net/core/filter.c
+++ b/net/core/filter.c
@@ -1712,7 +1712,7 @@ static const struct bpf_func_proto bpf_skb_store_bytes_proto = {
        .ret_type       = RET_INTEGER,
        .arg1_type      = ARG_PTR_TO_CTX,
        .arg2_type      = ARG_ANYTHING,
-       .arg3_type      = ARG_PTR_TO_MEM,
+       .arg3_type      = ARG_PTR_TO_MEM | MEM_RDONLY,
        .arg4_type      = ARG_CONST_SIZE,
        .arg5_type      = ARG_ANYTHING,
 };
@@ -2017,9 +2017,9 @@ static const struct bpf_func_proto bpf_csum_diff_proto = {
        .gpl_only       = false,
        .pkt_access     = true,
        .ret_type       = RET_INTEGER,
-       .arg1_type      = ARG_PTR_TO_MEM_OR_NULL,
+       .arg1_type      = ARG_PTR_TO_MEM | PTR_MAYBE_NULL | MEM_RDONLY,
        .arg2_type      = ARG_CONST_SIZE_OR_ZERO,
-       .arg3_type      = ARG_PTR_TO_MEM_OR_NULL,
+       .arg3_type      = ARG_PTR_TO_MEM | PTR_MAYBE_NULL | MEM_RDONLY,
        .arg4_type      = ARG_CONST_SIZE_OR_ZERO,
        .arg5_type      = ARG_ANYTHING,
 };
@@ -2540,7 +2540,7 @@ static const struct bpf_func_proto bpf_redirect_neigh_proto = {
        .gpl_only       = false,
        .ret_type       = RET_INTEGER,
        .arg1_type      = ARG_ANYTHING,
-       .arg2_type      = ARG_PTR_TO_MEM_OR_NULL,
+       .arg2_type      = ARG_PTR_TO_MEM | PTR_MAYBE_NULL | MEM_RDONLY,
        .arg3_type      = ARG_CONST_SIZE_OR_ZERO,
        .arg4_type      = ARG_ANYTHING,
 };
@@ -4173,7 +4173,7 @@ static const struct bpf_func_proto bpf_skb_event_output_proto = {
        .arg1_type      = ARG_PTR_TO_CTX,
        .arg2_type      = ARG_CONST_MAP_PTR,
        .arg3_type      = ARG_ANYTHING,
-       .arg4_type      = ARG_PTR_TO_MEM,
+       .arg4_type      = ARG_PTR_TO_MEM | MEM_RDONLY,
        .arg5_type      = ARG_CONST_SIZE_OR_ZERO,
 };
 
@@ -4187,7 +4187,7 @@ const struct bpf_func_proto bpf_skb_output_proto = {
        .arg1_btf_id    = &bpf_skb_output_btf_ids[0],
        .arg2_type      = ARG_CONST_MAP_PTR,
        .arg3_type      = ARG_ANYTHING,
-       .arg4_type      = ARG_PTR_TO_MEM,
+       .arg4_type      = ARG_PTR_TO_MEM | MEM_RDONLY,
        .arg5_type      = ARG_CONST_SIZE_OR_ZERO,
 };
 
@@ -4370,7 +4370,7 @@ static const struct bpf_func_proto bpf_skb_set_tunnel_key_proto = {
        .gpl_only       = false,
        .ret_type       = RET_INTEGER,
        .arg1_type      = ARG_PTR_TO_CTX,
-       .arg2_type      = ARG_PTR_TO_MEM,
+       .arg2_type      = ARG_PTR_TO_MEM | MEM_RDONLY,
        .arg3_type      = ARG_CONST_SIZE,
        .arg4_type      = ARG_ANYTHING,
 };
@@ -4396,7 +4396,7 @@ static const struct bpf_func_proto bpf_skb_set_tunnel_opt_proto = {
        .gpl_only       = false,
        .ret_type       = RET_INTEGER,
        .arg1_type      = ARG_PTR_TO_CTX,
-       .arg2_type      = ARG_PTR_TO_MEM,
+       .arg2_type      = ARG_PTR_TO_MEM | MEM_RDONLY,
        .arg3_type      = ARG_CONST_SIZE,
 };
 
@@ -4566,7 +4566,7 @@ static const struct bpf_func_proto bpf_xdp_event_output_proto = {
        .arg1_type      = ARG_PTR_TO_CTX,
        .arg2_type      = ARG_CONST_MAP_PTR,
        .arg3_type      = ARG_ANYTHING,
-       .arg4_type      = ARG_PTR_TO_MEM,
+       .arg4_type      = ARG_PTR_TO_MEM | MEM_RDONLY,
        .arg5_type      = ARG_CONST_SIZE_OR_ZERO,
 };
 
@@ -4580,7 +4580,7 @@ const struct bpf_func_proto bpf_xdp_output_proto = {
        .arg1_btf_id    = &bpf_xdp_output_btf_ids[0],
        .arg2_type      = ARG_CONST_MAP_PTR,
        .arg3_type      = ARG_ANYTHING,
-       .arg4_type      = ARG_PTR_TO_MEM,
+       .arg4_type      = ARG_PTR_TO_MEM | MEM_RDONLY,
        .arg5_type      = ARG_CONST_SIZE_OR_ZERO,
 };
 
@@ -5066,7 +5066,7 @@ const struct bpf_func_proto bpf_sk_setsockopt_proto = {
        .arg1_type      = ARG_PTR_TO_BTF_ID_SOCK_COMMON,
        .arg2_type      = ARG_ANYTHING,
        .arg3_type      = ARG_ANYTHING,
-       .arg4_type      = ARG_PTR_TO_MEM,
+       .arg4_type      = ARG_PTR_TO_MEM | MEM_RDONLY,
        .arg5_type      = ARG_CONST_SIZE,
 };
 
@@ -5100,7 +5100,7 @@ static const struct bpf_func_proto bpf_sock_addr_setsockopt_proto = {
        .arg1_type      = ARG_PTR_TO_CTX,
        .arg2_type      = ARG_ANYTHING,
        .arg3_type      = ARG_ANYTHING,
-       .arg4_type      = ARG_PTR_TO_MEM,
+       .arg4_type      = ARG_PTR_TO_MEM | MEM_RDONLY,
        .arg5_type      = ARG_CONST_SIZE,
 };
 
@@ -5134,7 +5134,7 @@ static const struct bpf_func_proto bpf_sock_ops_setsockopt_proto = {
        .arg1_type      = ARG_PTR_TO_CTX,
        .arg2_type      = ARG_ANYTHING,
        .arg3_type      = ARG_ANYTHING,
-       .arg4_type      = ARG_PTR_TO_MEM,
+       .arg4_type      = ARG_PTR_TO_MEM | MEM_RDONLY,
        .arg5_type      = ARG_CONST_SIZE,
 };
 
@@ -5309,7 +5309,7 @@ static const struct bpf_func_proto bpf_bind_proto = {
        .gpl_only       = false,
        .ret_type       = RET_INTEGER,
        .arg1_type      = ARG_PTR_TO_CTX,
-       .arg2_type      = ARG_PTR_TO_MEM,
+       .arg2_type      = ARG_PTR_TO_MEM | MEM_RDONLY,
        .arg3_type      = ARG_CONST_SIZE,
 };
 
@@ -5897,7 +5897,7 @@ static const struct bpf_func_proto bpf_lwt_in_push_encap_proto = {
        .ret_type       = RET_INTEGER,
        .arg1_type      = ARG_PTR_TO_CTX,
        .arg2_type      = ARG_ANYTHING,
-       .arg3_type      = ARG_PTR_TO_MEM,
+       .arg3_type      = ARG_PTR_TO_MEM | MEM_RDONLY,
        .arg4_type      = ARG_CONST_SIZE
 };
 
@@ -5907,7 +5907,7 @@ static const struct bpf_func_proto bpf_lwt_xmit_push_encap_proto = {
        .ret_type       = RET_INTEGER,
        .arg1_type      = ARG_PTR_TO_CTX,
        .arg2_type      = ARG_ANYTHING,
-       .arg3_type      = ARG_PTR_TO_MEM,
+       .arg3_type      = ARG_PTR_TO_MEM | MEM_RDONLY,
        .arg4_type      = ARG_CONST_SIZE
 };
 
@@ -5950,7 +5950,7 @@ static const struct bpf_func_proto bpf_lwt_seg6_store_bytes_proto = {
        .ret_type       = RET_INTEGER,
        .arg1_type      = ARG_PTR_TO_CTX,
        .arg2_type      = ARG_ANYTHING,
-       .arg3_type      = ARG_PTR_TO_MEM,
+       .arg3_type      = ARG_PTR_TO_MEM | MEM_RDONLY,
        .arg4_type      = ARG_CONST_SIZE
 };
 
@@ -6038,7 +6038,7 @@ static const struct bpf_func_proto bpf_lwt_seg6_action_proto = {
        .ret_type       = RET_INTEGER,
        .arg1_type      = ARG_PTR_TO_CTX,
        .arg2_type      = ARG_ANYTHING,
-       .arg3_type      = ARG_PTR_TO_MEM,
+       .arg3_type      = ARG_PTR_TO_MEM | MEM_RDONLY,
        .arg4_type      = ARG_CONST_SIZE
 };
 
@@ -6263,7 +6263,7 @@ static const struct bpf_func_proto bpf_skc_lookup_tcp_proto = {
        .pkt_access     = true,
        .ret_type       = RET_PTR_TO_SOCK_COMMON_OR_NULL,
        .arg1_type      = ARG_PTR_TO_CTX,
-       .arg2_type      = ARG_PTR_TO_MEM,
+       .arg2_type      = ARG_PTR_TO_MEM | MEM_RDONLY,
        .arg3_type      = ARG_CONST_SIZE,
        .arg4_type      = ARG_ANYTHING,
        .arg5_type      = ARG_ANYTHING,
@@ -6282,7 +6282,7 @@ static const struct bpf_func_proto bpf_sk_lookup_tcp_proto = {
        .pkt_access     = true,
        .ret_type       = RET_PTR_TO_SOCKET_OR_NULL,
        .arg1_type      = ARG_PTR_TO_CTX,
-       .arg2_type      = ARG_PTR_TO_MEM,
+       .arg2_type      = ARG_PTR_TO_MEM | MEM_RDONLY,
        .arg3_type      = ARG_CONST_SIZE,
        .arg4_type      = ARG_ANYTHING,
        .arg5_type      = ARG_ANYTHING,
@@ -6301,7 +6301,7 @@ static const struct bpf_func_proto bpf_sk_lookup_udp_proto = {
        .pkt_access     = true,
        .ret_type       = RET_PTR_TO_SOCKET_OR_NULL,
        .arg1_type      = ARG_PTR_TO_CTX,
-       .arg2_type      = ARG_PTR_TO_MEM,
+       .arg2_type      = ARG_PTR_TO_MEM | MEM_RDONLY,
        .arg3_type      = ARG_CONST_SIZE,
        .arg4_type      = ARG_ANYTHING,
        .arg5_type      = ARG_ANYTHING,
@@ -6338,7 +6338,7 @@ static const struct bpf_func_proto bpf_xdp_sk_lookup_udp_proto = {
        .pkt_access     = true,
        .ret_type       = RET_PTR_TO_SOCKET_OR_NULL,
        .arg1_type      = ARG_PTR_TO_CTX,
-       .arg2_type      = ARG_PTR_TO_MEM,
+       .arg2_type      = ARG_PTR_TO_MEM | MEM_RDONLY,
        .arg3_type      = ARG_CONST_SIZE,
        .arg4_type      = ARG_ANYTHING,
        .arg5_type      = ARG_ANYTHING,
@@ -6361,7 +6361,7 @@ static const struct bpf_func_proto bpf_xdp_skc_lookup_tcp_proto = {
        .pkt_access     = true,
        .ret_type       = RET_PTR_TO_SOCK_COMMON_OR_NULL,
        .arg1_type      = ARG_PTR_TO_CTX,
-       .arg2_type      = ARG_PTR_TO_MEM,
+       .arg2_type      = ARG_PTR_TO_MEM | MEM_RDONLY,
        .arg3_type      = ARG_CONST_SIZE,
        .arg4_type      = ARG_ANYTHING,
        .arg5_type      = ARG_ANYTHING,
@@ -6384,7 +6384,7 @@ static const struct bpf_func_proto bpf_xdp_sk_lookup_tcp_proto = {
        .pkt_access     = true,
        .ret_type       = RET_PTR_TO_SOCKET_OR_NULL,
        .arg1_type      = ARG_PTR_TO_CTX,
-       .arg2_type      = ARG_PTR_TO_MEM,
+       .arg2_type      = ARG_PTR_TO_MEM | MEM_RDONLY,
        .arg3_type      = ARG_CONST_SIZE,
        .arg4_type      = ARG_ANYTHING,
        .arg5_type      = ARG_ANYTHING,
@@ -6403,7 +6403,7 @@ static const struct bpf_func_proto bpf_sock_addr_skc_lookup_tcp_proto = {
        .gpl_only       = false,
        .ret_type       = RET_PTR_TO_SOCK_COMMON_OR_NULL,
        .arg1_type      = ARG_PTR_TO_CTX,
-       .arg2_type      = ARG_PTR_TO_MEM,
+       .arg2_type      = ARG_PTR_TO_MEM | MEM_RDONLY,
        .arg3_type      = ARG_CONST_SIZE,
        .arg4_type      = ARG_ANYTHING,
        .arg5_type      = ARG_ANYTHING,
@@ -6422,7 +6422,7 @@ static const struct bpf_func_proto bpf_sock_addr_sk_lookup_tcp_proto = {
        .gpl_only       = false,
        .ret_type       = RET_PTR_TO_SOCKET_OR_NULL,
        .arg1_type      = ARG_PTR_TO_CTX,
-       .arg2_type      = ARG_PTR_TO_MEM,
+       .arg2_type      = ARG_PTR_TO_MEM | MEM_RDONLY,
        .arg3_type      = ARG_CONST_SIZE,
        .arg4_type      = ARG_ANYTHING,
        .arg5_type      = ARG_ANYTHING,
@@ -6441,7 +6441,7 @@ static const struct bpf_func_proto bpf_sock_addr_sk_lookup_udp_proto = {
        .gpl_only       = false,
        .ret_type       = RET_PTR_TO_SOCKET_OR_NULL,
        .arg1_type      = ARG_PTR_TO_CTX,
-       .arg2_type      = ARG_PTR_TO_MEM,
+       .arg2_type      = ARG_PTR_TO_MEM | MEM_RDONLY,
        .arg3_type      = ARG_CONST_SIZE,
        .arg4_type      = ARG_ANYTHING,
        .arg5_type      = ARG_ANYTHING,
@@ -6754,9 +6754,9 @@ static const struct bpf_func_proto bpf_tcp_check_syncookie_proto = {
        .pkt_access     = true,
        .ret_type       = RET_INTEGER,
        .arg1_type      = ARG_PTR_TO_BTF_ID_SOCK_COMMON,
-       .arg2_type      = ARG_PTR_TO_MEM,
+       .arg2_type      = ARG_PTR_TO_MEM | MEM_RDONLY,
        .arg3_type      = ARG_CONST_SIZE,
-       .arg4_type      = ARG_PTR_TO_MEM,
+       .arg4_type      = ARG_PTR_TO_MEM | MEM_RDONLY,
        .arg5_type      = ARG_CONST_SIZE,
 };
 
@@ -6823,9 +6823,9 @@ static const struct bpf_func_proto bpf_tcp_gen_syncookie_proto = {
        .pkt_access     = true,
        .ret_type       = RET_INTEGER,
        .arg1_type      = ARG_PTR_TO_BTF_ID_SOCK_COMMON,
-       .arg2_type      = ARG_PTR_TO_MEM,
+       .arg2_type      = ARG_PTR_TO_MEM | MEM_RDONLY,
        .arg3_type      = ARG_CONST_SIZE,
-       .arg4_type      = ARG_PTR_TO_MEM,
+       .arg4_type      = ARG_PTR_TO_MEM | MEM_RDONLY,
        .arg5_type      = ARG_CONST_SIZE,
 };
 
@@ -7054,7 +7054,7 @@ static const struct bpf_func_proto bpf_sock_ops_store_hdr_opt_proto = {
        .gpl_only       = false,
        .ret_type       = RET_INTEGER,
        .arg1_type      = ARG_PTR_TO_CTX,
-       .arg2_type      = ARG_PTR_TO_MEM,
+       .arg2_type      = ARG_PTR_TO_MEM | MEM_RDONLY,
        .arg3_type      = ARG_CONST_SIZE,
        .arg4_type      = ARG_ANYTHING,
 };