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HID: bpf: allow write access to quirks field in struct hid_device

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This allows to give more control from BPF during report descriptor fixup.
We already reset the quirks before calling ->probe(), so now we reset
it once before calling hid_bpf_rdesc_fixup().

Reviewed-by: Peter Hutterer <peter.hutterer@who-t.net>
Link: https://patch.msgid.link/20241001-hid-bpf-hid-generic-v3-4-2ef1019468df@kernel.org
Signed-off-by: Benjamin Tissoires <bentiss@kernel.org>
This commit is contained in:
Benjamin Tissoires 2024-10-01 16:30:08 +02:00
parent 7316fef4b9
commit 6fd47effe9
2 changed files with 10 additions and 2 deletions
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1
drivers/hid/bpf/hid_bpf_struct_ops.c
View File

@ -79,6 +79,7 @@ static int hid_bpf_ops_btf_struct_access(struct bpf_verifier_log *log,
WRITE_RANGE(hid_device, name, true),
WRITE_RANGE(hid_device, uniq, true),
WRITE_RANGE(hid_device, phys, true),
WRITE_RANGE(hid_device, quirks, false),
};
#undef WRITE_RANGE
const struct btf_type *state = NULL;

11
drivers/hid/hid-core.c
View File

@ -2709,6 +2709,12 @@ static int __hid_device_probe(struct hid_device *hdev, struct hid_driver *hdrv)
int ret;
if (!hdev->bpf_rsize) {
unsigned int quirks;
/* reset the quirks that has been previously set */
quirks = hid_lookup_quirk(hdev);
hdev->quirks = quirks;
/* in case a bpf program gets detached, we need to free the old one */
hid_free_bpf_rdesc(hdev);
@ -2718,6 +2724,9 @@ static int __hid_device_probe(struct hid_device *hdev, struct hid_driver *hdrv)
/* call_hid_bpf_rdesc_fixup will always return a valid pointer */
hdev->bpf_rdesc = call_hid_bpf_rdesc_fixup(hdev, hdev->dev_rdesc,
&hdev->bpf_rsize);
if (quirks ^ hdev->quirks)
hid_info(hdev, "HID-BPF toggled quirks on the device: %04x",
quirks ^ hdev->quirks);
}
if (!hid_check_device_match(hdev, hdrv, &id))
@ -2727,8 +2736,6 @@ static int __hid_device_probe(struct hid_device *hdev, struct hid_driver *hdrv)
if (!hdev->devres_group_id)
return -ENOMEM;
/* reset the quirks that has been previously set */
hdev->quirks = hid_lookup_quirk(hdev);
hdev->driver = hdrv;
if (hdrv->probe) {