From patchwork Sat Jun 8 09:01:28 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Benjamin Tissoires X-Patchwork-Id: 13690959 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 5D65917D8AB; Sat, 8 Jun 2024 09:01:59 +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=1717837319; cv=none; b=e1nSkO9nYdaWHDb58/xIrfcV0hmuPOLgrsJaIzeUlcRaZmIhnU0dVTAzJvFsB9yuTaATIf2amj+nc/FFGk5O2wG3QVoSJkEkrUt9ZCc9hmrmOM2xE5/Nm03xtq9c9Agl4uqRN+0chOkWL74uHMcNQ7OPtqhEZm7+CBhX5IgYBBY= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1717837319; c=relaxed/simple; bh=YHolCvF3jA/DQGyy5jN6lFObu+rIHNuOu9Dmy3Vod3s=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=vAWuIfFrgPMtDd82JCM4NYweVN+JMXxDNs7ImURdwFWxd/YrHTbnxEDC9VLrA+ttRytoELiXp+n0x2+KTa4WU6kF/4I5q0XSHUlMAMZQl++YeBOKiil/s1Gm18ohF4PjoZXeDuvdeJJ94p/F2t8kDTmio0gJfFe7HK7oQWVxb/s= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=LnGemssx; 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="LnGemssx" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 194D5C2BD11; Sat, 8 Jun 2024 09:01:56 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1717837318; bh=YHolCvF3jA/DQGyy5jN6lFObu+rIHNuOu9Dmy3Vod3s=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=LnGemssx+z+2K25Xw92Vk4C+ubNIsAfaEmFEbd0Tik3oN5d5gYJMkWvjaNImlQatE R2bP64tn3V8FknJxybCEobkZbtFtgb8mOQX3v7Lkxd2iIJFemsXckHrbCq/5OtB7Yv mFBKw3tB+ImpWCwAoZVyymfKyTUIZVCz8V1HVG9CZlgYGIbXRu03A1iHlq7DzXpwRy mlohtUSJsomVheW16NDYB+NbUJl7jrRjjMljtGsYR+8D/I3k6ricVI9XwzSHUCu0TF e1MBSPZBeJcCchnXe279kZ8wGRsZHEzMWFedMEbmpQlh6vUjfGexyePkHSxRp42lGB ok7vhLH3VXtLA== From: Benjamin Tissoires Date: Sat, 08 Jun 2024 11:01:28 +0200 Subject: [PATCH HID v3 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: <20240608-hid_bpf_struct_ops-v3-16-6ac6ade58329@kernel.org> References: <20240608-hid_bpf_struct_ops-v3-0-6ac6ade58329@kernel.org> In-Reply-To: <20240608-hid_bpf_struct_ops-v3-0-6ac6ade58329@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=1717837279; l=1694; i=bentiss@kernel.org; s=20230215; h=from:subject:message-id; bh=YHolCvF3jA/DQGyy5jN6lFObu+rIHNuOu9Dmy3Vod3s=; b=CdyFQFSOvnA/Vvz1fzchBiZjuEjZvhWbXkEF/tt9wXTyR9zjNA+HozZMMQG0RO/2vF20g01sT n5qq7W2nfvgAHvK0GUkqigT7+e1KxJDjF0kSVu9OT9JFxIZKpXZ7bCL 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 --- changes in v3: - amend for new WRITE_RANGE API 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 b14eccb121e0..e28cca78e1f5 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, false), + WRITE_RANGE(hid_device, name, true), + WRITE_RANGE(hid_device, uniq, true), + WRITE_RANGE(hid_device, phys, true), }; #undef WRITE_RANGE const struct btf_type *state = NULL; diff --git a/include/linux/hid_bpf.h b/include/linux/hid_bpf.h index 1b4cc1b2c31d..65d7e0acc8c2 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;