HID: bpf: introduce hid_hw_request()

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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>

...

This commit is contained in:

Benjamin Tissoires 2022-11-03 16:57:49 +01:00 • committed by Jiri Kosina

parent 0330f725cc

commit 91a7f802d1

3 changed files with 148 additions and 1 deletions

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134

drivers/hid/bpf/hid_bpf_dispatch.c

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2

drivers/hid/hid-core.c

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13

include/linux/hid_bpf.h

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