[HID,v3,16/16] HID: bpf: make part of struct hid_device writable

Commit Message

Benjamin Tissoires June 8, 2024, 9:01 a.m. UTC

It is useful to change the name, the phys and/or the uniq of a
struct hid_device during .rdesc_fixup().

For example, hid-uclogic.ko changes the uniq to store the firmware version
to differentiate between 2 devices sharing the same PID. In the same
way, changing the device name is useful when the device export 3 nodes,
all with the same name.

Signed-off-by: Benjamin Tissoires <[e-mail]>

---

changes in v3:
- amend for new WRITE_RANGE API

new in v2
---
 drivers/hid/bpf/hid_bpf_struct_ops.c | 3 +++
 include/linux/hid_bpf.h              | 2 +-
 2 files changed, 4 insertions(+), 1 deletion(-)

Patch

diff --git a/drivers/hid/bpf/hid_bpf_struct_ops.c b/drivers/hid/bpf/hid_bpf_struct_ops.c
index b14eccb121e0..e28cca78e1f5 100644
--- a/drivers/hid/bpf/hid_bpf_struct_ops.c
+++ b/drivers/hid/bpf/hid_bpf_struct_ops.c
@@ -74,6 +74,9 @@  static int hid_bpf_ops_btf_struct_access(struct bpf_verifier_log *log,
 
 	const struct hid_bpf_offset_write_range write_ranges[] = {
 		WRITE_RANGE(hid_bpf_ctx, retval, false),
+		WRITE_RANGE(hid_device, name, true),
+		WRITE_RANGE(hid_device, uniq, true),
+		WRITE_RANGE(hid_device, phys, true),
 	};
 #undef WRITE_RANGE
 	const struct btf_type *state = NULL;
diff --git a/include/linux/hid_bpf.h b/include/linux/hid_bpf.h
index 1b4cc1b2c31d..65d7e0acc8c2 100644
--- a/include/linux/hid_bpf.h
+++ b/include/linux/hid_bpf.h
@@ -43,7 +43,7 @@  struct hid_device;
  * ``hid`` and ``allocated_size`` are read-only, ``size`` and ``retval`` are read-write.
  */
 struct hid_bpf_ctx {
-	const struct hid_device *hid;
+	struct hid_device *hid;
 	__u32 allocated_size;
 	union {
 		__s32 retval;