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94dfc73e7c
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:
(linux-5.19-rc2$ 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
];
};
-fstrict-flex-arrays=3 is coming and we need to land these changes
to prevent issues like these in the short future:
../fs/minix/dir.c:337:3: warning: 'strcpy' will always overflow; destination buffer has size 0,
but the source string has length 2 (including NUL byte) [-Wfortify-source]
strcpy(de3->name, ".");
^
Since these are all [0] to [] changes, the risk to UAPI is nearly zero. If
this breaks anything, we can use a union with a new member name.
[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
Build-tested-by: kernel test robot <lkp@intel.com>
Link: https://lore.kernel.org/lkml/62b675ec.wKX6AOZ6cbE71vtF%25lkp@intel.com/
Acked-by: Dan Williams <dan.j.williams@intel.com> # For ndctl.h
Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
81 lines
2.2 KiB
C
81 lines
2.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */
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/*
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* connector.h
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*
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* 2004-2005 Copyright (c) Evgeniy Polyakov <zbr@ioremap.net>
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* All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#ifndef _UAPI__CONNECTOR_H
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#define _UAPI__CONNECTOR_H
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#include <linux/types.h>
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/*
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* Process Events connector unique ids -- used for message routing
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*/
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#define CN_IDX_PROC 0x1
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#define CN_VAL_PROC 0x1
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#define CN_IDX_CIFS 0x2
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#define CN_VAL_CIFS 0x1
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#define CN_W1_IDX 0x3 /* w1 communication */
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#define CN_W1_VAL 0x1
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#define CN_IDX_V86D 0x4
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#define CN_VAL_V86D_UVESAFB 0x1
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#define CN_IDX_BB 0x5 /* BlackBoard, from the TSP GPL sampling framework */
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#define CN_DST_IDX 0x6
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#define CN_DST_VAL 0x1
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#define CN_IDX_DM 0x7 /* Device Mapper */
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#define CN_VAL_DM_USERSPACE_LOG 0x1
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#define CN_IDX_DRBD 0x8
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#define CN_VAL_DRBD 0x1
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#define CN_KVP_IDX 0x9 /* HyperV KVP */
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#define CN_KVP_VAL 0x1 /* queries from the kernel */
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#define CN_VSS_IDX 0xA /* HyperV VSS */
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#define CN_VSS_VAL 0x1 /* queries from the kernel */
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#define CN_NETLINK_USERS 11 /* Highest index + 1 */
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/*
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* Maximum connector's message size.
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*/
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#define CONNECTOR_MAX_MSG_SIZE 16384
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/*
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* idx and val are unique identifiers which
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* are used for message routing and
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* must be registered in connector.h for in-kernel usage.
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*/
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struct cb_id {
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__u32 idx;
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__u32 val;
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};
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struct cn_msg {
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struct cb_id id;
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__u32 seq;
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__u32 ack;
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__u16 len; /* Length of the following data */
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__u16 flags;
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__u8 data[];
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};
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#endif /* _UAPI__CONNECTOR_H */
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