HID: bpf: allocate data memory for device_event BPF programs

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We need to also be able to change the size of the report.
Reducing it is easy, because we already have the incoming buffer that is
big enough, but extending it is harder.

Pre-allocate a buffer that is big enough to handle all reports of the
device, and use that as the primary buffer for BPF programs.
To be able to change the size of the buffer, we change the device_event
API and request it to return the size of the buffer.

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

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Benjamin Tissoires 2022-11-03 16:57:47 +01:00 • committed by Jiri Kosina

parent 0baef37335

commit 658ee5a64f

4 changed files with 151 additions and 18 deletions

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116

drivers/hid/bpf/hid_bpf_dispatch.c

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4

drivers/hid/bpf/hid_bpf_jmp_table.c

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12

drivers/hid/hid-core.c

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37

include/linux/hid_bpf.h

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