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![Gustavo A. R. Silva](/assets/img/avatar_default.png)
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>
55 lines
1.2 KiB
C
55 lines
1.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */
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/*
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* SR-IPv6 implementation
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*
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* Author:
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* David Lebrun <david.lebrun@uclouvain.be>
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*
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#ifndef _UAPI_LINUX_SEG6_H
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#define _UAPI_LINUX_SEG6_H
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#include <linux/types.h>
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#include <linux/in6.h> /* For struct in6_addr. */
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/*
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* SRH
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*/
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struct ipv6_sr_hdr {
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__u8 nexthdr;
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__u8 hdrlen;
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__u8 type;
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__u8 segments_left;
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__u8 first_segment; /* Represents the last_entry field of SRH */
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__u8 flags;
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__u16 tag;
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struct in6_addr segments[];
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};
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#define SR6_FLAG1_PROTECTED (1 << 6)
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#define SR6_FLAG1_OAM (1 << 5)
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#define SR6_FLAG1_ALERT (1 << 4)
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#define SR6_FLAG1_HMAC (1 << 3)
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#define SR6_TLV_INGRESS 1
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#define SR6_TLV_EGRESS 2
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#define SR6_TLV_OPAQUE 3
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#define SR6_TLV_PADDING 4
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#define SR6_TLV_HMAC 5
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#define sr_has_hmac(srh) ((srh)->flags & SR6_FLAG1_HMAC)
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struct sr6_tlv {
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__u8 type;
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__u8 len;
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__u8 data[0];
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};
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#endif
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