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[bpf-next,08/11] bpf: Enable and verify btf_field arrays.

Message ID 20240410004150.2917641-9-thinker.li@gmail.com (mailing list archive)
State Superseded
Delegated to: BPF
Headers show
Series Enable BPF programs to declare arrays of kptr, bpf_rb_root, and bpf_list_head. | expand

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Commit Message

Kui-Feng Lee April 10, 2024, 12:41 a.m. UTC 
Set the value of "nelems" of a btf_field with the length of the flattened
array if the btf_field represents an array. The "size" is the size of the
entire array rather than the size of an individual element.

Once "nelems" and "size" reflects the length and size of arrays
respectively, it allows BPF programs to easily declare multiple kptr,
btf_rb_root, or btf_list_head in a global array.

Signed-off-by: Kui-Feng Lee <thinker.li@gmail.com>
---
 kernel/bpf/btf.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
diff mbox series

Patch

diff --git a/kernel/bpf/btf.c b/kernel/bpf/btf.c
index 831073285ef2..d228360ee1c6 100644
--- a/kernel/bpf/btf.c
+++ b/kernel/bpf/btf.c
@@ -3836,7 +3836,7 @@  struct btf_record *btf_parse_fields(const struct btf *btf, const struct btf_type
 	rec->timer_off = -EINVAL;
 	rec->refcount_off = -EINVAL;
 	for (i = 0; i < cnt; i++) {
-		field_type_size = btf_field_type_size(info_arr[i].type);
+		field_type_size = btf_field_type_size(info_arr[i].type) * info_arr[i].nelems;
 		if (info_arr[i].off + field_type_size > value_size) {
 			WARN_ONCE(1, "verifier bug off %d size %d", info_arr[i].off, value_size);
 			ret = -EFAULT;
@@ -3852,7 +3852,7 @@  struct btf_record *btf_parse_fields(const struct btf *btf, const struct btf_type
 		rec->fields[i].offset = info_arr[i].off;
 		rec->fields[i].type = info_arr[i].type;
 		rec->fields[i].size = field_type_size;
-		rec->fields[i].nelems = 1;
+		rec->fields[i].nelems = info_arr[i].nelems;
 
 		switch (info_arr[i].type) {
 		case BPF_SPIN_LOCK: