bpf: mark all registered map/prog types as __ro_after_init

All map types and prog types are registered to the BPF core through
bpf_register_map_type() and bpf_register_prog_type() during init and
remain unchanged thereafter. As by design we don't (and never will)
have any pluggable code that can register to that at any later point
in time, lets mark all the existing bpf_{map,prog}_type_list objects
in the tree as __ro_after_init, so they can be moved to read-only
section from then onwards.

Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

5 files changed, 14 insertions, 14 deletions

diff --git a/kernel/bpf/arraymap.c b/kernel/bpf/arraymap.c
index 3d55d95dcf49..6b6f41f0b211 100644
--- a/kernel/bpf/arraymap.c
+++ b/kernel/bpf/arraymap.c
@@ -269,7 +269,7 @@ static const struct bpf_map_ops array_ops = {
 	.map_delete_elem = array_map_delete_elem,
 };
 
-static struct bpf_map_type_list array_type __read_mostly = {
+static struct bpf_map_type_list array_type __ro_after_init = {
 	.ops = &array_ops,
 	.type = BPF_MAP_TYPE_ARRAY,
 };
@@ -283,7 +283,7 @@ static const struct bpf_map_ops percpu_array_ops = {
 	.map_delete_elem = array_map_delete_elem,
 };
 
-static struct bpf_map_type_list percpu_array_type __read_mostly = {
+static struct bpf_map_type_list percpu_array_type __ro_after_init = {
 	.ops = &percpu_array_ops,
 	.type = BPF_MAP_TYPE_PERCPU_ARRAY,
 };
@@ -409,7 +409,7 @@ static const struct bpf_map_ops prog_array_ops = {
 	.map_fd_put_ptr = prog_fd_array_put_ptr,
 };
 
-static struct bpf_map_type_list prog_array_type __read_mostly = {
+static struct bpf_map_type_list prog_array_type __ro_after_init = {
 	.ops = &prog_array_ops,
 	.type = BPF_MAP_TYPE_PROG_ARRAY,
 };
@@ -522,7 +522,7 @@ static const struct bpf_map_ops perf_event_array_ops = {
 	.map_release = perf_event_fd_array_release,
 };
 
-static struct bpf_map_type_list perf_event_array_type __read_mostly = {
+static struct bpf_map_type_list perf_event_array_type __ro_after_init = {
 	.ops = &perf_event_array_ops,
 	.type = BPF_MAP_TYPE_PERF_EVENT_ARRAY,
 };
@@ -564,7 +564,7 @@ static const struct bpf_map_ops cgroup_array_ops = {
 	.map_fd_put_ptr = cgroup_fd_array_put_ptr,
 };
 
-static struct bpf_map_type_list cgroup_array_type __read_mostly = {
+static struct bpf_map_type_list cgroup_array_type __ro_after_init = {
 	.ops = &cgroup_array_ops,
 	.type = BPF_MAP_TYPE_CGROUP_ARRAY,
 };
diff --git a/kernel/bpf/hashtab.c b/kernel/bpf/hashtab.c
index a753bbe7df0a..3ea87fb19a94 100644
--- a/kernel/bpf/hashtab.c
+++ b/kernel/bpf/hashtab.c
@@ -1023,7 +1023,7 @@ static const struct bpf_map_ops htab_ops = {
 	.map_delete_elem = htab_map_delete_elem,
 };
 
-static struct bpf_map_type_list htab_type __read_mostly = {
+static struct bpf_map_type_list htab_type __ro_after_init = {
 	.ops = &htab_ops,
 	.type = BPF_MAP_TYPE_HASH,
 };
@@ -1037,7 +1037,7 @@ static const struct bpf_map_ops htab_lru_ops = {
 	.map_delete_elem = htab_lru_map_delete_elem,
 };
 
-static struct bpf_map_type_list htab_lru_type __read_mostly = {
+static struct bpf_map_type_list htab_lru_type __ro_after_init = {
 	.ops = &htab_lru_ops,
 	.type = BPF_MAP_TYPE_LRU_HASH,
 };
@@ -1124,7 +1124,7 @@ static const struct bpf_map_ops htab_percpu_ops = {
 	.map_delete_elem = htab_map_delete_elem,
 };
 
-static struct bpf_map_type_list htab_percpu_type __read_mostly = {
+static struct bpf_map_type_list htab_percpu_type __ro_after_init = {
 	.ops = &htab_percpu_ops,
 	.type = BPF_MAP_TYPE_PERCPU_HASH,
 };
@@ -1138,7 +1138,7 @@ static const struct bpf_map_ops htab_lru_percpu_ops = {
 	.map_delete_elem = htab_lru_map_delete_elem,
 };
 
-static struct bpf_map_type_list htab_lru_percpu_type __read_mostly = {
+static struct bpf_map_type_list htab_lru_percpu_type __ro_after_init = {
 	.ops = &htab_lru_percpu_ops,
 	.type = BPF_MAP_TYPE_LRU_PERCPU_HASH,
 };
diff --git a/kernel/bpf/lpm_trie.c b/kernel/bpf/lpm_trie.c
index e0f6a0bd279b..8bfe0afaee10 100644
--- a/kernel/bpf/lpm_trie.c
+++ b/kernel/bpf/lpm_trie.c
@@ -508,7 +508,7 @@ static const struct bpf_map_ops trie_ops = {
 	.map_delete_elem = trie_delete_elem,
 };
 
-static struct bpf_map_type_list trie_type __read_mostly = {
+static struct bpf_map_type_list trie_type __ro_after_init = {
 	.ops = &trie_ops,
 	.type = BPF_MAP_TYPE_LPM_TRIE,
 };
diff --git a/kernel/bpf/stackmap.c b/kernel/bpf/stackmap.c
index be8519148c25..22aa45cd0324 100644
--- a/kernel/bpf/stackmap.c
+++ b/kernel/bpf/stackmap.c
@@ -273,7 +273,7 @@ static const struct bpf_map_ops stack_map_ops = {
 	.map_delete_elem = stack_map_delete_elem,
 };
 
-static struct bpf_map_type_list stack_map_type __read_mostly = {
+static struct bpf_map_type_list stack_map_type __ro_after_init = {
 	.ops = &stack_map_ops,
 	.type = BPF_MAP_TYPE_STACK_TRACE,
 };
diff --git a/kernel/trace/bpf_trace.c b/kernel/trace/bpf_trace.c
index 424daa4586d1..cee9802cf3e0 100644
--- a/kernel/trace/bpf_trace.c
+++ b/kernel/trace/bpf_trace.c
@@ -506,7 +506,7 @@ static const struct bpf_verifier_ops kprobe_prog_ops = {
 	.is_valid_access = kprobe_prog_is_valid_access,
 };
 
-static struct bpf_prog_type_list kprobe_tl = {
+static struct bpf_prog_type_list kprobe_tl __ro_after_init = {
 	.ops	= &kprobe_prog_ops,
 	.type	= BPF_PROG_TYPE_KPROBE,
 };
@@ -589,7 +589,7 @@ static const struct bpf_verifier_ops tracepoint_prog_ops = {
 	.is_valid_access = tp_prog_is_valid_access,
 };
 
-static struct bpf_prog_type_list tracepoint_tl = {
+static struct bpf_prog_type_list tracepoint_tl __ro_after_init = {
 	.ops	= &tracepoint_prog_ops,
 	.type	= BPF_PROG_TYPE_TRACEPOINT,
 };
@@ -648,7 +648,7 @@ static const struct bpf_verifier_ops perf_event_prog_ops = {
 	.convert_ctx_access	= pe_prog_convert_ctx_access,
 };
 
-static struct bpf_prog_type_list perf_event_tl = {
+static struct bpf_prog_type_list perf_event_tl __ro_after_init = {
 	.ops	= &perf_event_prog_ops,
 	.type	= BPF_PROG_TYPE_PERF_EVENT,
 };