From patchwork Fri Jun 7 15:28:36 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Benjamin Tissoires X-Patchwork-Id: 13690429 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 4BE1D1A01B4; Fri, 7 Jun 2024 15:29:10 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1717774150; cv=none; b=RXEDAoJtkkpOoNvAdDwpLWMuAUozTp00Bjsk8FnDvCXEKxJL3aIprf3LN7EMEWZW1hP8Mbu5e8bEZ5jOuNq23ypMOQ33cEv2siVLDzn4kwhWrOuEJwycRW5Z66nuQNQP/tnR+WOhG5v/8gogFAU9YteE8LYGqG/0BsFs8I3VMTA= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1717774150; c=relaxed/simple; bh=19seXFGbiAkxbo+NZHKMcYfBUtAeq/ulfefjwHuSoZc=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=lOYICOEg4SC+Ws4gEF/JCy6CouCXk/jxaV0AZ7BLItPoV61J4W0KLui05JzC1DzgNGDJtQkWe2UVMTGzufLwZOKgETjFubPXP+mNyBwldO+tE5jMYB7ahmqBDxxvPSGjjf5pyF6kIJdEE6qKJ9jOqe/9hN/uVVrtotWxC4owrHA= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=TgmVNW8a; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="TgmVNW8a" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 177EAC2BBFC; Fri, 7 Jun 2024 15:29:07 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1717774150; bh=19seXFGbiAkxbo+NZHKMcYfBUtAeq/ulfefjwHuSoZc=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=TgmVNW8afj36k/PFucIKm4wSkJ0wT6uIZ9wryBj66eNic1wapQ93QglWnjUm0Yy+f cVQutANVWh8Wi2rL14pXnIZIPPgJhf8C8dNTW8hnPBv2dLCekapSGofbI0tfP/1bNb TcNQsa5EtevZT83EPDaND05UztNHrxSz2kI5JszcY8AXwv8t/DlOXp4pWWdRLtJHdX hpYsKDpiJW7docSudPyfjTYUFxKXtHXqvLesYZlShZGk5QdGouLydjLKxZKQztVb/c 42Cz/BE5ZTB/EgboJlLwRFJ7frVUIoOBhsFHIhqa5h+i6bPhVKrXiSE7XeMUDTr40l I5RYyWfr1I8Fg== From: Benjamin Tissoires Date: Fri, 07 Jun 2024 17:28:36 +0200 Subject: [PATCH HID v2 16/16] HID: bpf: make part of struct hid_device writable Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20240607-hid_bpf_struct_ops-v2-16-3f95f4d02292@kernel.org> References: <20240607-hid_bpf_struct_ops-v2-0-3f95f4d02292@kernel.org> In-Reply-To: <20240607-hid_bpf_struct_ops-v2-0-3f95f4d02292@kernel.org> To: Shuah Khan , Jiri Kosina , Jonathan Corbet , Alexei Starovoitov Cc: linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org, bpf@vger.kernel.org, linux-input@vger.kernel.org, linux-doc@vger.kernel.org, Benjamin Tissoires X-Mailer: b4 0.13.0 X-Developer-Signature: v=1; a=ed25519-sha256; t=1717774109; l=1759; i=bentiss@kernel.org; s=20230215; h=from:subject:message-id; bh=19seXFGbiAkxbo+NZHKMcYfBUtAeq/ulfefjwHuSoZc=; b=zhnQpCROcnvr89ISnDPYEYndFo9rbiyiAbgUDd7dF4leBcVaODleyUtOiep9224qku8mSx+8N Y5lOv8YiE5tDVGQQcRaU8w+sgToskNEYh9M/ZWX7LBI6CY80q1bUMJv X-Developer-Key: i=bentiss@kernel.org; a=ed25519; pk=7D1DyAVh6ajCkuUTudt/chMuXWIJHlv2qCsRkIizvFw= 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 --- 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(-) diff --git a/drivers/hid/bpf/hid_bpf_struct_ops.c b/drivers/hid/bpf/hid_bpf_struct_ops.c index 944e6d91a36b..14a4c64ae242 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, 0, 0), + WRITE_RANGE(hid_device, name, 0, -1), /* minus 1 to ensure \0 at the end */ + WRITE_RANGE(hid_device, uniq, 0, -1), /* minus 1 to ensure \0 at the end */ + WRITE_RANGE(hid_device, phys, 0, -1), /* minus 1 to ensure \0 at the end */ }; #undef WRITE_RANGE const struct btf_type *state = NULL; diff --git a/include/linux/hid_bpf.h b/include/linux/hid_bpf.h index 88ab4925bdaa..ff30cbc0a090 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;