HID: bpf: introduce hid_hw_request()

This function can not be called under IRQ, thus it is only available
while in SEC("syscall").
For consistency, this function requires a HID-BPF context to work with,
and so we also provide a helper to create one based on the HID unique
ID.

Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>

--

changes in v12:
- variable dereferenced before check 'ctx'
  |Reported-by: kernel test robot <lkp@intel.com>
  |Reported-by: Dan Carpenter <error27@gmail.com>

no changes in v11

no changes in v10

changes in v9:
- fixed kfunc declaration aaccording to latest upstream changes

no changes in v8

changes in v7:
- hid_bpf_allocate_context: remove unused variable
- ensures buf is not NULL

changes in v6:
- rename parameter size into buf__sz to teach the verifier about
  the actual buffer size used by the call
- remove the allocated data in the user created context, it's not used

new-ish in v5
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

1 files changed, 2 insertions, 0 deletions

diff --git a/drivers/hid/hid-core.c b/drivers/hid/hid-core.c
index 400a7b8133c6..6bf47e352f23 100644
--- a/drivers/hid/hid-core.c
+++ b/drivers/hid/hid-core.c
@@ -2919,6 +2919,8 @@ EXPORT_SYMBOL_GPL(hid_check_keys_pressed);
 
 #ifdef CONFIG_HID_BPF
 static struct hid_bpf_ops hid_ops = {
+	.hid_get_report = hid_get_report,
+	.hid_hw_raw_request = hid_hw_raw_request,
 	.owner = THIS_MODULE,
 	.bus_type = &hid_bus_type,
 };