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-rw-r--r--kernel/bpf/btf.c34
1 files changed, 26 insertions, 8 deletions
diff --git a/kernel/bpf/btf.c b/kernel/bpf/btf.c
index a31704a6bb..15d71d2986 100644
--- a/kernel/bpf/btf.c
+++ b/kernel/bpf/btf.c
@@ -3293,6 +3293,8 @@ static int btf_find_kptr(const struct btf *btf, const struct btf_type *t,
type = BPF_KPTR_UNREF;
else if (!strcmp("kptr", __btf_name_by_offset(btf, t->name_off)))
type = BPF_KPTR_REF;
+ else if (!strcmp("percpu_kptr", __btf_name_by_offset(btf, t->name_off)))
+ type = BPF_KPTR_PERCPU;
else
return -EINVAL;
@@ -3308,10 +3310,10 @@ static int btf_find_kptr(const struct btf *btf, const struct btf_type *t,
return BTF_FIELD_FOUND;
}
-static const char *btf_find_decl_tag_value(const struct btf *btf,
- const struct btf_type *pt,
- int comp_idx, const char *tag_key)
+const char *btf_find_decl_tag_value(const struct btf *btf, const struct btf_type *pt,
+ int comp_idx, const char *tag_key)
{
+ const char *value = NULL;
int i;
for (i = 1; i < btf_nr_types(btf); i++) {
@@ -3325,9 +3327,14 @@ static const char *btf_find_decl_tag_value(const struct btf *btf,
continue;
if (strncmp(__btf_name_by_offset(btf, t->name_off), tag_key, len))
continue;
- return __btf_name_by_offset(btf, t->name_off) + len;
+ /* Prevent duplicate entries for same type */
+ if (value)
+ return ERR_PTR(-EEXIST);
+ value = __btf_name_by_offset(btf, t->name_off) + len;
}
- return NULL;
+ if (!value)
+ return ERR_PTR(-ENOENT);
+ return value;
}
static int
@@ -3345,7 +3352,7 @@ btf_find_graph_root(const struct btf *btf, const struct btf_type *pt,
if (t->size != sz)
return BTF_FIELD_IGNORE;
value_type = btf_find_decl_tag_value(btf, pt, comp_idx, "contains:");
- if (!value_type)
+ if (IS_ERR(value_type))
return -EINVAL;
node_field_name = strstr(value_type, ":");
if (!node_field_name)
@@ -3457,6 +3464,7 @@ static int btf_find_struct_field(const struct btf *btf,
break;
case BPF_KPTR_UNREF:
case BPF_KPTR_REF:
+ case BPF_KPTR_PERCPU:
ret = btf_find_kptr(btf, member_type, off, sz,
idx < info_cnt ? &info[idx] : &tmp);
if (ret < 0)
@@ -3523,6 +3531,7 @@ static int btf_find_datasec_var(const struct btf *btf, const struct btf_type *t,
break;
case BPF_KPTR_UNREF:
case BPF_KPTR_REF:
+ case BPF_KPTR_PERCPU:
ret = btf_find_kptr(btf, var_type, off, sz,
idx < info_cnt ? &info[idx] : &tmp);
if (ret < 0)
@@ -3783,6 +3792,7 @@ struct btf_record *btf_parse_fields(const struct btf *btf, const struct btf_type
break;
case BPF_KPTR_UNREF:
case BPF_KPTR_REF:
+ case BPF_KPTR_PERCPU:
ret = btf_parse_kptr(btf, &rec->fields[i], &info_arr[i]);
if (ret < 0)
goto end;
@@ -6949,7 +6959,7 @@ int btf_check_subprog_call(struct bpf_verifier_env *env, int subprog,
* (either PTR_TO_CTX or SCALAR_VALUE).
*/
int btf_prepare_func_args(struct bpf_verifier_env *env, int subprog,
- struct bpf_reg_state *regs)
+ struct bpf_reg_state *regs, bool is_ex_cb)
{
struct bpf_verifier_log *log = &env->log;
struct bpf_prog *prog = env->prog;
@@ -7006,7 +7016,7 @@ int btf_prepare_func_args(struct bpf_verifier_env *env, int subprog,
tname, nargs, MAX_BPF_FUNC_REG_ARGS);
return -EINVAL;
}
- /* check that function returns int */
+ /* check that function returns int, exception cb also requires this */
t = btf_type_by_id(btf, t->type);
while (btf_type_is_modifier(t))
t = btf_type_by_id(btf, t->type);
@@ -7055,6 +7065,14 @@ int btf_prepare_func_args(struct bpf_verifier_env *env, int subprog,
i, btf_type_str(t), tname);
return -EINVAL;
}
+ /* We have already ensured that the callback returns an integer, just
+ * like all global subprogs. We need to determine it only has a single
+ * scalar argument.
+ */
+ if (is_ex_cb && (nargs != 1 || regs[BPF_REG_1].type != SCALAR_VALUE)) {
+ bpf_log(log, "exception cb only supports single integer argument\n");
+ return -EINVAL;
+ }
return 0;
}