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syscalls/x86: auto-create compat_sys_*() prototypes 

compat_sys_*() functions are no longer called from within the kernel on
x86 except from the system call table. Linking the system call does not
require compat_sys_*() function prototypes at least on x86. Therefore,
generate compat_sys_*() prototypes on-the-fly within the
COMPAT_SYSCALL_DEFINEx() macro, and remove x86-specific prototypes from
various header files.

Suggested-by: Andy Lutomirski <luto@kernel.org>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: David S. Miller <davem@davemloft.net>
Cc: netdev@vger.kernel.org
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: x86@kernel.org
Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
This commit is contained in:
Dominik Brodowski 2018-03-22 14:09:17 +01:00
parent c679a08983
commit 3e2052e5dd
4 changed files with 4 additions and 80 deletions
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1
arch/x86/ia32/ia32_signal.c
View File

@ -33,7 +33,6 @@
#include <asm/vdso.h>
#include <asm/sigframe.h>
#include <asm/sighandling.h>
#include <asm/sys_ia32.h>
#include <asm/smap.h>
/*

2
arch/x86/ia32/sys_ia32.c
View File

@ -47,7 +47,7 @@
#include <linux/uaccess.h>
#include <linux/atomic.h>
#include <asm/vgtod.h>
#include <asm/sys_ia32.h>
#include <asm/ia32.h>
#define AA(__x) ((unsigned long)(__x))

64
arch/x86/include/asm/sys_ia32.h
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@ -1,64 +0,0 @@
/*
* sys_ia32.h - Linux ia32 syscall interfaces
*
* Copyright (c) 2008 Jaswinder Singh Rajput
*
* This file is released under the GPLv2.
* See the file COPYING for more details.
*/
#ifndef _ASM_X86_SYS_IA32_H
#define _ASM_X86_SYS_IA32_H
#ifdef CONFIG_COMPAT
#include <linux/compiler.h>
#include <linux/linkage.h>
#include <linux/types.h>
#include <linux/signal.h>
#include <asm/compat.h>
#include <asm/ia32.h>
/* ia32/sys_ia32.c */
asmlinkage long compat_sys_x86_truncate64(const char __user *, unsigned long,
unsigned long);
asmlinkage long compat_sys_x86_ftruncate64(unsigned int, unsigned long,
unsigned long);
asmlinkage long compat_sys_x86_stat64(const char __user *,
struct stat64 __user *);
asmlinkage long compat_sys_x86_lstat64(const char __user *,
struct stat64 __user *);
asmlinkage long compat_sys_x86_fstat64(unsigned int, struct stat64 __user *);
asmlinkage long compat_sys_x86_fstatat(unsigned int, const char __user *,
struct stat64 __user *, int);
struct mmap_arg_struct32;
asmlinkage long compat_sys_x86_mmap(struct mmap_arg_struct32 __user *);
asmlinkage long compat_sys_x86_pread(unsigned int, char __user *, u32, u32,
u32);
asmlinkage long compat_sys_x86_pwrite(unsigned int, const char __user *, u32,
u32, u32);
asmlinkage long compat_sys_x86_fadvise64_64(int, __u32, __u32, __u32, __u32,
int);
asmlinkage ssize_t compat_sys_x86_readahead(int, unsigned int, unsigned int,
size_t);
asmlinkage long compat_sys_x86_sync_file_range(int, unsigned int, unsigned int,
unsigned int, unsigned int,
int);
asmlinkage long compat_sys_x86_fadvise64(int, unsigned int, unsigned int,
size_t, int);
asmlinkage long compat_sys_x86_fallocate(int, int, unsigned int, unsigned int,
unsigned int, unsigned int);
asmlinkage long compat_sys_x86_clone(unsigned long, unsigned long, int __user *,
unsigned long, int __user *);
/* ia32/ia32_signal.c */
asmlinkage long sys32_sigreturn(void);
asmlinkage long sys32_rt_sigreturn(void);
#endif /* CONFIG_COMPAT */
#endif /* _ASM_X86_SYS_IA32_H */

17
include/linux/compat.h
View File

@ -49,6 +49,7 @@
COMPAT_SYSCALL_DEFINEx(6, _##name, __VA_ARGS__)
#define COMPAT_SYSCALL_DEFINEx(x, name, ...) \
asmlinkage long compat_sys##name(__MAP(x,__SC_DECL,__VA_ARGS__));\
asmlinkage long compat_sys##name(__MAP(x,__SC_DECL,__VA_ARGS__))\
__attribute__((alias(__stringify(compat_SyS##name)))); \
static inline long C_SYSC##name(__MAP(x,__SC_DECL,__VA_ARGS__));\
@ -507,8 +508,8 @@ int __compat_save_altstack(compat_stack_t __user *, unsigned long);
/*
* These syscall function prototypes are kept in the same order as
* include/uapi/asm-generic/unistd.h. Architecture specific entries go below,
* followed by deprecated or obsolete system calls.
* include/uapi/asm-generic/unistd.h. Deprecated or obsolete system calls
* go below.
*
* Please note that these prototypes here are only provided for information
* purposes, for static analysis, and for linking from the syscall table.
@ -882,18 +883,6 @@ asmlinkage long compat_sys_pwritev64v2(unsigned long fd,
#endif
/*
* Architecture-specific system calls
*/
/* fs/quota/compat.c -- x86 only */
asmlinkage long compat_sys_quotactl32(unsigned int cmd,
const char __user *special, qid_t id, void __user *addr);
/* arch_prctl -- x86 */
asmlinkage long compat_sys_arch_prctl(int option, unsigned long arg2);
/*
* Deprecated system calls which are still defined in
* include/uapi/asm-generic/unistd.h and wanted by >= 1 arch