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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>
67 lines
2.1 KiB
C
67 lines
2.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
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#ifndef __MIPS_UAPI_ASM_UCONTEXT_H
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#define __MIPS_UAPI_ASM_UCONTEXT_H
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/**
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* struct extcontext - extended context header structure
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* @magic: magic value identifying the type of extended context
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* @size: the size in bytes of the enclosing structure
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*
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* Extended context structures provide context which does not fit within struct
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* sigcontext. They are placed sequentially in memory at the end of struct
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* ucontext and struct sigframe, with each extended context structure beginning
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* with a header defined by this struct. The type of context represented is
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* indicated by the magic field. Userland may check each extended context
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* structure against magic values that it recognises. The size field allows any
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* unrecognised context to be skipped, allowing for future expansion. The end
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* of the extended context data is indicated by the magic value
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* END_EXTCONTEXT_MAGIC.
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*/
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struct extcontext {
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unsigned int magic;
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unsigned int size;
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};
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/**
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* struct msa_extcontext - MSA extended context structure
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* @ext: the extended context header, with magic == MSA_EXTCONTEXT_MAGIC
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* @wr: the most significant 64 bits of each MSA vector register
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* @csr: the value of the MSA control & status register
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*
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* If MSA context is live for a task at the time a signal is delivered to it,
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* this structure will hold the MSA context of the task as it was prior to the
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* signal delivery.
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*/
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struct msa_extcontext {
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struct extcontext ext;
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#define MSA_EXTCONTEXT_MAGIC 0x784d5341 /* xMSA */
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unsigned long long wr[32];
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unsigned int csr;
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};
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#define END_EXTCONTEXT_MAGIC 0x78454e44 /* xEND */
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/**
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* struct ucontext - user context structure
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* @uc_flags:
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* @uc_link:
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* @uc_stack:
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* @uc_mcontext: holds basic processor state
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* @uc_sigmask:
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* @uc_extcontext: holds extended processor state
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*/
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struct ucontext {
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/* Historic fields matching asm-generic */
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unsigned long uc_flags;
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struct ucontext *uc_link;
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stack_t uc_stack;
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struct sigcontext uc_mcontext;
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sigset_t uc_sigmask;
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/* Extended context structures may follow ucontext */
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unsigned long long uc_extcontext[];
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};
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#endif /* __MIPS_UAPI_ASM_UCONTEXT_H */
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