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5224f79096
There is a regular need in the kernel to provide a way to declare
having a dynamically sized set of trailing elements in a structure.
Kernel code should always use “flexible array members”[1] for these
cases. The older style of one-element or zero-length arrays should
no longer be used[2].
This code was transformed with the help of Coccinelle:
(next-20220214$ spatch --jobs $(getconf _NPROCESSORS_ONLN) --sp-file script.cocci --include-headers --dir . > output.patch)
@@
identifier S, member, array;
type T1, T2;
@@
struct S {
...
T1 member;
T2 array[
- 0
];
};
UAPI and wireless changes were intentionally excluded from this patch
and will be sent out separately.
[1] https://en.wikipedia.org/wiki/Flexible_array_member
[2] https://www.kernel.org/doc/html/v5.16/process/deprecated.html#zero-length-and-one-element-arrays
Link: https://github.com/KSPP/linux/issues/78
Reviewed-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
96 lines
3.0 KiB
C
96 lines
3.0 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Copyright (C) 2010 - 2015 UNISYS CORPORATION
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* All rights reserved.
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*/
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#ifndef __VBUSCHANNEL_H__
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#define __VBUSCHANNEL_H__
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/*
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* The vbus channel is the channel area provided via the BUS_CREATE controlvm
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* message for each virtual bus. This channel area is provided to both server
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* and client ends of the bus. The channel header area is initialized by
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* the server, and the remaining information is filled in by the client.
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* We currently use this for the client to provide various information about
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* the client devices and client drivers for the server end to see.
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*/
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#include <linux/uuid.h>
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#include <linux/visorbus.h>
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/* {193b331b-c58f-11da-95a9-00e08161165f} */
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#define VISOR_VBUS_CHANNEL_GUID \
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GUID_INIT(0x193b331b, 0xc58f, 0x11da, \
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0x95, 0xa9, 0x0, 0xe0, 0x81, 0x61, 0x16, 0x5f)
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/*
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* Must increment this whenever you insert or delete fields within this channel
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* struct. Also increment whenever you change the meaning of fields within this
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* channel struct so as to break pre-existing software. Note that you can
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* usually add fields to the END of the channel struct withOUT needing to
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* increment this.
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*/
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#define VISOR_VBUS_CHANNEL_VERSIONID 1
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/*
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* struct visor_vbus_deviceinfo
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* @devtype: Short string identifying the device type.
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* @drvname: Driver .sys file name.
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* @infostrs: Kernel vversion.
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* @reserved: Pad size to 256 bytes.
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*
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* An array of this struct is present in the channel area for each vbus. It is
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* filled in by the client side to provide info about the device and driver from
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* the client's perspective.
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*/
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struct visor_vbus_deviceinfo {
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u8 devtype[16];
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u8 drvname[16];
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u8 infostrs[96];
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u8 reserved[128];
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} __packed;
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/*
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* struct visor_vbus_headerinfo
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* @struct_bytes: Size of this struct in bytes.
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* @device_info_struct_bytes: Size of VISOR_VBUS_DEVICEINFO.
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* @dev_info_count: Num of items in DevInfo member. This is the
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* allocated size.
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* @chp_info_offset: Byte offset from beginning of this struct to the
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* ChpInfo struct.
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* @bus_info_offset: Byte offset from beginning of this struct to the
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* BusInfo struct.
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* @dev_info_offset: Byte offset from beginning of this struct to the
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* DevInfo array.
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* @reserved: Natural alignment.
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*/
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struct visor_vbus_headerinfo {
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u32 struct_bytes;
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u32 device_info_struct_bytes;
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u32 dev_info_count;
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u32 chp_info_offset;
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u32 bus_info_offset;
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u32 dev_info_offset;
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u8 reserved[104];
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} __packed;
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/*
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* struct visor_vbus_channel
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* @channel_header: Initialized by server.
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* @hdr_info: Initialized by server.
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* @chp_info: Describes client chipset device and driver.
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* @bus_info: Describes client bus device and driver.
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* @dev_info: Describes client device and driver for each device on the
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* bus.
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*/
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struct visor_vbus_channel {
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struct channel_header channel_header;
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struct visor_vbus_headerinfo hdr_info;
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struct visor_vbus_deviceinfo chp_info;
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struct visor_vbus_deviceinfo bus_info;
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struct visor_vbus_deviceinfo dev_info[];
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} __packed;
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#endif
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