syscalls/x86: Use 'struct pt_regs' based syscall calling for IA32_EMULATION and x32

Extend ARCH_HAS_SYSCALL_WRAPPER for i386 emulation and for x32 on 64-bit x86. For x32, all we need to do is to create an additional stub for each compat syscall which decodes the parameters in x86-64 ordering, e.g.: asmlinkage long __compat_sys_x32_xyzzy(struct pt_regs *regs) { return c_SyS_xyzzy(regs->di, regs->si, regs->dx); } For i386 emulation, we need to teach compat_sys_*() to take struct pt_regs as its only argument, e.g.: asmlinkage long __compat_sys_ia32_xyzzy(struct pt_regs *regs) { return c_SyS_xyzzy(regs->bx, regs->cx, regs->dx); } In addition, we need to create additional stubs for common syscalls (that is, for syscalls which have the same parameters on 32-bit and 64-bit), e.g.: asmlinkage long __sys_ia32_xyzzy(struct pt_regs *regs) { return c_sys_xyzzy(regs->bx, regs->cx, regs->dx); } This approach avoids leaking random user-provided register content down the call chain. This patch is based on an original proof-of-concept | From: Linus Torvalds <torvalds@linux-foundation.org> | Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> and was split up and heavily modified by me, in particular to base it on ARCH_HAS_SYSCALL_WRAPPER. Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net> Acked-by: Linus Torvalds <torvalds@linux-foundation.org> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Andy Lutomirski <luto@kernel.org> Cc: Borislav Petkov <bp@alien8.de> Cc: Brian Gerst <brgerst@gmail.com> Cc: Denys Vlasenko <dvlasenk@redhat.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Josh Poimboeuf <jpoimboe@redhat.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/20180405095307.3730-6-linux@dominikbrodowski.net Signed-off-by: Ingo Molnar <mingo@kernel.org>
2018-04-05 11:53:04 +02:00 · 2018-04-05 11:53:04 +02:00 · ebeb8c82ff
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@ -2957,5 +2957,5 @@ source "lib/Kconfig"

 config SYSCALL_PTREGS
 	def_bool y
-	depends on X86_64 && !COMPAT
+	depends on X86_64
 	select ARCH_HAS_SYSCALL_WRAPPER
--- a/arch/x86/entry/common.c
+++ b/arch/x86/entry/common.c
@ -325,6 +325,9 @@ static __always_inline void do_syscall_32_irqs_on(struct pt_regs *regs)

 	if (likely(nr < IA32_NR_syscalls)) {
 		nr = array_index_nospec(nr, IA32_NR_syscalls);
+#ifdef CONFIG_SYSCALL_PTREGS
+		regs->ax = ia32_sys_call_table[nr](regs);
+#else
 		/*
 		 * It's possible that a 32-bit syscall implementation
 		 * takes a 64-bit parameter but nonetheless assumes that
@ -335,6 +338,7 @@ static __always_inline void do_syscall_32_irqs_on(struct pt_regs *regs)
 			(unsigned int)regs->bx, (unsigned int)regs->cx,
 			(unsigned int)regs->dx, (unsigned int)regs->si,
 			(unsigned int)regs->di, (unsigned int)regs->bp);
+#endif /* CONFIG_SYSCALL_PTREGS */
 	}

 	syscall_return_slowpath(regs);
--- a/arch/x86/entry/syscall_32.c
+++ b/arch/x86/entry/syscall_32.c
@ -7,14 +7,23 @@
 #include <asm/asm-offsets.h>
 #include <asm/syscall.h>

-#define __SYSCALL_I386(nr, sym, qual) extern asmlinkage long sym(unsigned long, unsigned long, unsigned long, unsigned long, unsigned long, unsigned long) ;
+#ifdef CONFIG_SYSCALL_PTREGS
+/* On X86_64, we use struct pt_regs * to pass parameters to syscalls */
+#define __SYSCALL_I386(nr, sym, qual) extern asmlinkage long sym(const struct pt_regs *);
+
+/* this is a lie, but it does not hurt as sys_ni_syscall just returns -EINVAL */
+extern asmlinkage long sys_ni_syscall(const struct pt_regs *);
+
+#else /* CONFIG_SYSCALL_PTREGS */
+#define __SYSCALL_I386(nr, sym, qual) extern asmlinkage long sym(unsigned long, unsigned long, unsigned long, unsigned long, unsigned long, unsigned long);
+extern asmlinkage long sys_ni_syscall(unsigned long, unsigned long, unsigned long, unsigned long, unsigned long, unsigned long);
+#endif /* CONFIG_SYSCALL_PTREGS */
+
 #include <asm/syscalls_32.h>
 #undef __SYSCALL_I386

 #define __SYSCALL_I386(nr, sym, qual) [nr] = sym,

-extern asmlinkage long sys_ni_syscall(unsigned long, unsigned long, unsigned long, unsigned long, unsigned long, unsigned long);
-
 __visible const sys_call_ptr_t ia32_sys_call_table[__NR_syscall_compat_max+1] = {
 	/*
 	 * Smells like a compiler bug -- it doesn't work
--- a/arch/x86/entry/syscalls/syscall_32.tbl
+++ b/arch/x86/entry/syscalls/syscall_32.tbl
@ -4,390 +4,395 @@
 # The format is:
 # <number> <abi> <name> <entry point> <compat entry point>
 #
+# The __sys_ia32 and __compat_sys_ia32 stubs are created on-the-fly for
+# sys_*() system calls and compat_sys_*() compat system calls if
+# IA32_EMULATION is defined, and expect struct pt_regs *regs as their only
+# parameter.
+#
 # The abi is always "i386" for this file.
 #
 0	i386	restart_syscall		sys_restart_syscall
-1	i386	exit			sys_exit
+1	i386	exit			sys_exit			__sys_ia32_exit
 2	i386	fork			sys_fork
-3	i386	read			sys_read
-4	i386	write			sys_write
-5	i386	open			sys_open			compat_sys_open
-6	i386	close			sys_close
-7	i386	waitpid			sys_waitpid
-8	i386	creat			sys_creat
-9	i386	link			sys_link
-10	i386	unlink			sys_unlink
-11	i386	execve			sys_execve			compat_sys_execve
-12	i386	chdir			sys_chdir
-13	i386	time			sys_time			compat_sys_time
-14	i386	mknod			sys_mknod
-15	i386	chmod			sys_chmod
-16	i386	lchown			sys_lchown16
+3	i386	read			sys_read			__sys_ia32_read
+4	i386	write			sys_write			__sys_ia32_write
+5	i386	open			sys_open			__compat_sys_ia32_open
+6	i386	close			sys_close			__sys_ia32_close
+7	i386	waitpid			sys_waitpid			__sys_ia32_waitpid
+8	i386	creat			sys_creat			__sys_ia32_creat
+9	i386	link			sys_link			__sys_ia32_link
+10	i386	unlink			sys_unlink			__sys_ia32_unlink
+11	i386	execve			sys_execve			__compat_sys_ia32_execve
+12	i386	chdir			sys_chdir			__sys_ia32_chdir
+13	i386	time			sys_time			__compat_sys_ia32_time
+14	i386	mknod			sys_mknod			__sys_ia32_mknod
+15	i386	chmod			sys_chmod			__sys_ia32_chmod
+16	i386	lchown			sys_lchown16			__sys_ia32_lchown16
 17	i386	break
-18	i386	oldstat			sys_stat
-19	i386	lseek			sys_lseek			compat_sys_lseek
+18	i386	oldstat			sys_stat			__sys_ia32_stat
+19	i386	lseek			sys_lseek			__compat_sys_ia32_lseek
 20	i386	getpid			sys_getpid
-21	i386	mount			sys_mount			compat_sys_mount
-22	i386	umount			sys_oldumount
-23	i386	setuid			sys_setuid16
+21	i386	mount			sys_mount			__compat_sys_ia32_mount
+22	i386	umount			sys_oldumount			__sys_ia32_oldumount
+23	i386	setuid			sys_setuid16			__sys_ia32_setuid16
 24	i386	getuid			sys_getuid16
-25	i386	stime			sys_stime			compat_sys_stime
-26	i386	ptrace			sys_ptrace			compat_sys_ptrace
-27	i386	alarm			sys_alarm
-28	i386	oldfstat		sys_fstat
+25	i386	stime			sys_stime			__compat_sys_ia32_stime
+26	i386	ptrace			sys_ptrace			__compat_sys_ia32_ptrace
+27	i386	alarm			sys_alarm			__sys_ia32_alarm
+28	i386	oldfstat		sys_fstat			__sys_ia32_fstat
 29	i386	pause			sys_pause
-30	i386	utime			sys_utime			compat_sys_utime
+30	i386	utime			sys_utime			__compat_sys_ia32_utime
 31	i386	stty
 32	i386	gtty
-33	i386	access			sys_access
-34	i386	nice			sys_nice
+33	i386	access			sys_access			__sys_ia32_access
+34	i386	nice			sys_nice			__sys_ia32_nice
 35	i386	ftime
 36	i386	sync			sys_sync
-37	i386	kill			sys_kill
-38	i386	rename			sys_rename
-39	i386	mkdir			sys_mkdir
-40	i386	rmdir			sys_rmdir
-41	i386	dup			sys_dup
-42	i386	pipe			sys_pipe
-43	i386	times			sys_times			compat_sys_times
+37	i386	kill			sys_kill			__sys_ia32_kill
+38	i386	rename			sys_rename			__sys_ia32_rename
+39	i386	mkdir			sys_mkdir			__sys_ia32_mkdir
+40	i386	rmdir			sys_rmdir			__sys_ia32_rmdir
+41	i386	dup			sys_dup				__sys_ia32_dup
+42	i386	pipe			sys_pipe			__sys_ia32_pipe
+43	i386	times			sys_times			__compat_sys_ia32_times
 44	i386	prof
-45	i386	brk			sys_brk
-46	i386	setgid			sys_setgid16
+45	i386	brk			sys_brk				__sys_ia32_brk
+46	i386	setgid			sys_setgid16			__sys_ia32_setgid16
 47	i386	getgid			sys_getgid16
-48	i386	signal			sys_signal
+48	i386	signal			sys_signal			__sys_ia32_signal
 49	i386	geteuid			sys_geteuid16
 50	i386	getegid			sys_getegid16
-51	i386	acct			sys_acct
-52	i386	umount2			sys_umount
+51	i386	acct			sys_acct			__sys_ia32_acct
+52	i386	umount2			sys_umount			__sys_ia32_umount
 53	i386	lock
-54	i386	ioctl			sys_ioctl			compat_sys_ioctl
-55	i386	fcntl			sys_fcntl			compat_sys_fcntl64
+54	i386	ioctl			sys_ioctl			__compat_sys_ia32_ioctl
+55	i386	fcntl			sys_fcntl			__compat_sys_ia32_fcntl64
 56	i386	mpx
-57	i386	setpgid			sys_setpgid
+57	i386	setpgid			sys_setpgid			__sys_ia32_setpgid
 58	i386	ulimit
-59	i386	oldolduname		sys_olduname
-60	i386	umask			sys_umask
-61	i386	chroot			sys_chroot
-62	i386	ustat			sys_ustat			compat_sys_ustat
-63	i386	dup2			sys_dup2
+59	i386	oldolduname		sys_olduname			__sys_ia32_olduname
+60	i386	umask			sys_umask			__sys_ia32_umask
+61	i386	chroot			sys_chroot			__sys_ia32_chroot
+62	i386	ustat			sys_ustat			__compat_sys_ia32_ustat
+63	i386	dup2			sys_dup2			__sys_ia32_dup2
 64	i386	getppid			sys_getppid
 65	i386	getpgrp			sys_getpgrp
 66	i386	setsid			sys_setsid
-67	i386	sigaction		sys_sigaction			compat_sys_sigaction
+67	i386	sigaction		sys_sigaction			__compat_sys_ia32_sigaction
 68	i386	sgetmask		sys_sgetmask
-69	i386	ssetmask		sys_ssetmask
-70	i386	setreuid		sys_setreuid16
-71	i386	setregid		sys_setregid16
-72	i386	sigsuspend		sys_sigsuspend
-73	i386	sigpending		sys_sigpending			compat_sys_sigpending
-74	i386	sethostname		sys_sethostname
-75	i386	setrlimit		sys_setrlimit			compat_sys_setrlimit
-76	i386	getrlimit		sys_old_getrlimit		compat_sys_old_getrlimit
-77	i386	getrusage		sys_getrusage			compat_sys_getrusage
-78	i386	gettimeofday		sys_gettimeofday		compat_sys_gettimeofday
-79	i386	settimeofday		sys_settimeofday		compat_sys_settimeofday
-80	i386	getgroups		sys_getgroups16
-81	i386	setgroups		sys_setgroups16
-82	i386	select			sys_old_select			compat_sys_old_select
-83	i386	symlink			sys_symlink
-84	i386	oldlstat		sys_lstat
-85	i386	readlink		sys_readlink
-86	i386	uselib			sys_uselib
-87	i386	swapon			sys_swapon
-88	i386	reboot			sys_reboot
-89	i386	readdir			sys_old_readdir			compat_sys_old_readdir
-90	i386	mmap			sys_old_mmap			compat_sys_x86_mmap
-91	i386	munmap			sys_munmap
-92	i386	truncate		sys_truncate			compat_sys_truncate
-93	i386	ftruncate		sys_ftruncate			compat_sys_ftruncate
-94	i386	fchmod			sys_fchmod
-95	i386	fchown			sys_fchown16
-96	i386	getpriority		sys_getpriority
-97	i386	setpriority		sys_setpriority
+69	i386	ssetmask		sys_ssetmask			__sys_ia32_ssetmask
+70	i386	setreuid		sys_setreuid16			__sys_ia32_setreuid16
+71	i386	setregid		sys_setregid16			__sys_ia32_setregid16
+72	i386	sigsuspend		sys_sigsuspend			__sys_ia32_sigsuspend
+73	i386	sigpending		sys_sigpending			__compat_sys_ia32_sigpending
+74	i386	sethostname		sys_sethostname			__sys_ia32_sethostname
+75	i386	setrlimit		sys_setrlimit			__compat_sys_ia32_setrlimit
+76	i386	getrlimit		sys_old_getrlimit		__compat_sys_ia32_old_getrlimit
+77	i386	getrusage		sys_getrusage			__compat_sys_ia32_getrusage
+78	i386	gettimeofday		sys_gettimeofday		__compat_sys_ia32_gettimeofday
+79	i386	settimeofday		sys_settimeofday		__compat_sys_ia32_settimeofday
+80	i386	getgroups		sys_getgroups16			__sys_ia32_getgroups16
+81	i386	setgroups		sys_setgroups16			__sys_ia32_setgroups16
+82	i386	select			sys_old_select			__compat_sys_ia32_old_select
+83	i386	symlink			sys_symlink			__sys_ia32_symlink
+84	i386	oldlstat		sys_lstat			__sys_ia32_lstat
+85	i386	readlink		sys_readlink			__sys_ia32_readlink
+86	i386	uselib			sys_uselib			__sys_ia32_uselib
+87	i386	swapon			sys_swapon			__sys_ia32_swapon
+88	i386	reboot			sys_reboot			__sys_ia32_reboot
+89	i386	readdir			sys_old_readdir			__compat_sys_ia32_old_readdir
+90	i386	mmap			sys_old_mmap			__compat_sys_ia32_x86_mmap
+91	i386	munmap			sys_munmap			__sys_ia32_munmap
+92	i386	truncate		sys_truncate			__compat_sys_ia32_truncate
+93	i386	ftruncate		sys_ftruncate			__compat_sys_ia32_ftruncate
+94	i386	fchmod			sys_fchmod			__sys_ia32_fchmod
+95	i386	fchown			sys_fchown16			__sys_ia32_fchown16
+96	i386	getpriority		sys_getpriority			__sys_ia32_getpriority
+97	i386	setpriority		sys_setpriority			__sys_ia32_setpriority
 98	i386	profil
-99	i386	statfs			sys_statfs			compat_sys_statfs
-100	i386	fstatfs			sys_fstatfs			compat_sys_fstatfs
-101	i386	ioperm			sys_ioperm
-102	i386	socketcall		sys_socketcall			compat_sys_socketcall
-103	i386	syslog			sys_syslog
-104	i386	setitimer		sys_setitimer			compat_sys_setitimer
-105	i386	getitimer		sys_getitimer			compat_sys_getitimer
-106	i386	stat			sys_newstat			compat_sys_newstat
-107	i386	lstat			sys_newlstat			compat_sys_newlstat
-108	i386	fstat			sys_newfstat			compat_sys_newfstat
-109	i386	olduname		sys_uname
-110	i386	iopl			sys_iopl
+99	i386	statfs			sys_statfs			__compat_sys_ia32_statfs
+100	i386	fstatfs			sys_fstatfs			__compat_sys_ia32_fstatfs
+101	i386	ioperm			sys_ioperm			__sys_ia32_ioperm
+102	i386	socketcall		sys_socketcall			__compat_sys_ia32_socketcall
+103	i386	syslog			sys_syslog			__sys_ia32_syslog
+104	i386	setitimer		sys_setitimer			__compat_sys_ia32_setitimer
+105	i386	getitimer		sys_getitimer			__compat_sys_ia32_getitimer
+106	i386	stat			sys_newstat			__compat_sys_ia32_newstat
+107	i386	lstat			sys_newlstat			__compat_sys_ia32_newlstat
+108	i386	fstat			sys_newfstat			__compat_sys_ia32_newfstat
+109	i386	olduname		sys_uname			__sys_ia32_uname
+110	i386	iopl			sys_iopl			__sys_ia32_iopl
 111	i386	vhangup			sys_vhangup
 112	i386	idle
 113	i386	vm86old			sys_vm86old			sys_ni_syscall
-114	i386	wait4			sys_wait4			compat_sys_wait4
-115	i386	swapoff			sys_swapoff
-116	i386	sysinfo			sys_sysinfo			compat_sys_sysinfo
-117	i386	ipc			sys_ipc				compat_sys_ipc
-118	i386	fsync			sys_fsync
+114	i386	wait4			sys_wait4			__compat_sys_ia32_wait4
+115	i386	swapoff			sys_swapoff			__sys_ia32_swapoff
+116	i386	sysinfo			sys_sysinfo			__compat_sys_ia32_sysinfo
+117	i386	ipc			sys_ipc				__compat_sys_ia32_ipc
+118	i386	fsync			sys_fsync			__sys_ia32_fsync
 119	i386	sigreturn		sys_sigreturn			sys32_sigreturn
-120	i386	clone			sys_clone			compat_sys_x86_clone
-121	i386	setdomainname		sys_setdomainname
-122	i386	uname			sys_newuname
-123	i386	modify_ldt		sys_modify_ldt
-124	i386	adjtimex		sys_adjtimex			compat_sys_adjtimex
-125	i386	mprotect		sys_mprotect
-126	i386	sigprocmask		sys_sigprocmask			compat_sys_sigprocmask
+120	i386	clone			sys_clone			__compat_sys_ia32_x86_clone
+121	i386	setdomainname		sys_setdomainname		__sys_ia32_setdomainname
+122	i386	uname			sys_newuname			__sys_ia32_newuname
+123	i386	modify_ldt		sys_modify_ldt			__sys_ia32_modify_ldt
+124	i386	adjtimex		sys_adjtimex			__compat_sys_ia32_adjtimex
+125	i386	mprotect		sys_mprotect			__sys_ia32_mprotect
+126	i386	sigprocmask		sys_sigprocmask			__compat_sys_ia32_sigprocmask
 127	i386	create_module
-128	i386	init_module		sys_init_module
-129	i386	delete_module		sys_delete_module
+128	i386	init_module		sys_init_module			__sys_ia32_init_module
+129	i386	delete_module		sys_delete_module		__sys_ia32_delete_module
 130	i386	get_kernel_syms
-131	i386	quotactl		sys_quotactl			compat_sys_quotactl32
-132	i386	getpgid			sys_getpgid
-133	i386	fchdir			sys_fchdir
-134	i386	bdflush			sys_bdflush
-135	i386	sysfs			sys_sysfs
-136	i386	personality		sys_personality
+131	i386	quotactl		sys_quotactl			__compat_sys_ia32_quotactl32
+132	i386	getpgid			sys_getpgid			__sys_ia32_getpgid
+133	i386	fchdir			sys_fchdir			__sys_ia32_fchdir
+134	i386	bdflush			sys_bdflush			__sys_ia32_bdflush
+135	i386	sysfs			sys_sysfs			__sys_ia32_sysfs
+136	i386	personality		sys_personality			__sys_ia32_personality
 137	i386	afs_syscall
-138	i386	setfsuid		sys_setfsuid16
-139	i386	setfsgid		sys_setfsgid16
-140	i386	_llseek			sys_llseek
-141	i386	getdents		sys_getdents			compat_sys_getdents
-142	i386	_newselect		sys_select			compat_sys_select
-143	i386	flock			sys_flock
-144	i386	msync			sys_msync
-145	i386	readv			sys_readv			compat_sys_readv
-146	i386	writev			sys_writev			compat_sys_writev
-147	i386	getsid			sys_getsid
-148	i386	fdatasync		sys_fdatasync
-149	i386	_sysctl			sys_sysctl			compat_sys_sysctl
-150	i386	mlock			sys_mlock
-151	i386	munlock			sys_munlock
-152	i386	mlockall		sys_mlockall
+138	i386	setfsuid		sys_setfsuid16			__sys_ia32_setfsuid16
+139	i386	setfsgid		sys_setfsgid16			__sys_ia32_setfsgid16
+140	i386	_llseek			sys_llseek			__sys_ia32_llseek
+141	i386	getdents		sys_getdents			__compat_sys_ia32_getdents
+142	i386	_newselect		sys_select			__compat_sys_ia32_select
+143	i386	flock			sys_flock			__sys_ia32_flock
+144	i386	msync			sys_msync			__sys_ia32_msync
+145	i386	readv			sys_readv			__compat_sys_ia32_readv
+146	i386	writev			sys_writev			__compat_sys_ia32_writev
+147	i386	getsid			sys_getsid			__sys_ia32_getsid
+148	i386	fdatasync		sys_fdatasync			__sys_ia32_fdatasync
+149	i386	_sysctl			sys_sysctl			__compat_sys_ia32_sysctl
+150	i386	mlock			sys_mlock			__sys_ia32_mlock
+151	i386	munlock			sys_munlock			__sys_ia32_munlock
+152	i386	mlockall		sys_mlockall			__sys_ia32_mlockall
 153	i386	munlockall		sys_munlockall
-154	i386	sched_setparam		sys_sched_setparam
-155	i386	sched_getparam		sys_sched_getparam
-156	i386	sched_setscheduler	sys_sched_setscheduler
-157	i386	sched_getscheduler	sys_sched_getscheduler
+154	i386	sched_setparam		sys_sched_setparam		__sys_ia32_sched_setparam
+155	i386	sched_getparam		sys_sched_getparam		__sys_ia32_sched_getparam
+156	i386	sched_setscheduler	sys_sched_setscheduler		__sys_ia32_sched_setscheduler
+157	i386	sched_getscheduler	sys_sched_getscheduler		__sys_ia32_sched_getscheduler
 158	i386	sched_yield		sys_sched_yield
-159	i386	sched_get_priority_max	sys_sched_get_priority_max
-160	i386	sched_get_priority_min	sys_sched_get_priority_min
-161	i386	sched_rr_get_interval	sys_sched_rr_get_interval	compat_sys_sched_rr_get_interval
-162	i386	nanosleep		sys_nanosleep			compat_sys_nanosleep
-163	i386	mremap			sys_mremap
-164	i386	setresuid		sys_setresuid16
-165	i386	getresuid		sys_getresuid16
+159	i386	sched_get_priority_max	sys_sched_get_priority_max	__sys_ia32_sched_get_priority_max
+160	i386	sched_get_priority_min	sys_sched_get_priority_min	__sys_ia32_sched_get_priority_min
+161	i386	sched_rr_get_interval	sys_sched_rr_get_interval	__compat_sys_ia32_sched_rr_get_interval
+162	i386	nanosleep		sys_nanosleep			__compat_sys_ia32_nanosleep
+163	i386	mremap			sys_mremap			__sys_ia32_mremap
+164	i386	setresuid		sys_setresuid16			__sys_ia32_setresuid16
+165	i386	getresuid		sys_getresuid16			__sys_ia32_getresuid16
 166	i386	vm86			sys_vm86			sys_ni_syscall
 167	i386	query_module
-168	i386	poll			sys_poll
+168	i386	poll			sys_poll			__sys_ia32_poll
 169	i386	nfsservctl
-170	i386	setresgid		sys_setresgid16
-171	i386	getresgid		sys_getresgid16
-172	i386	prctl			sys_prctl
+170	i386	setresgid		sys_setresgid16			__sys_ia32_setresgid16
+171	i386	getresgid		sys_getresgid16			__sys_ia32_getresgid16
+172	i386	prctl			sys_prctl			__sys_ia32_prctl
 173	i386	rt_sigreturn		sys_rt_sigreturn		sys32_rt_sigreturn
-174	i386	rt_sigaction		sys_rt_sigaction		compat_sys_rt_sigaction
-175	i386	rt_sigprocmask		sys_rt_sigprocmask
-176	i386	rt_sigpending		sys_rt_sigpending		compat_sys_rt_sigpending
-177	i386	rt_sigtimedwait		sys_rt_sigtimedwait		compat_sys_rt_sigtimedwait
-178	i386	rt_sigqueueinfo		sys_rt_sigqueueinfo		compat_sys_rt_sigqueueinfo
-179	i386	rt_sigsuspend		sys_rt_sigsuspend
-180	i386	pread64			sys_pread64			compat_sys_x86_pread
-181	i386	pwrite64		sys_pwrite64			compat_sys_x86_pwrite
-182	i386	chown			sys_chown16
-183	i386	getcwd			sys_getcwd
-184	i386	capget			sys_capget
-185	i386	capset			sys_capset
-186	i386	sigaltstack		sys_sigaltstack			compat_sys_sigaltstack
-187	i386	sendfile		sys_sendfile			compat_sys_sendfile
+174	i386	rt_sigaction		sys_rt_sigaction		__compat_sys_ia32_rt_sigaction
+175	i386	rt_sigprocmask		sys_rt_sigprocmask		__sys_ia32_rt_sigprocmask
+176	i386	rt_sigpending		sys_rt_sigpending		__compat_sys_ia32_rt_sigpending
+177	i386	rt_sigtimedwait		sys_rt_sigtimedwait		__compat_sys_ia32_rt_sigtimedwait
+178	i386	rt_sigqueueinfo		sys_rt_sigqueueinfo		__compat_sys_ia32_rt_sigqueueinfo
+179	i386	rt_sigsuspend		sys_rt_sigsuspend		__sys_ia32_rt_sigsuspend
+180	i386	pread64			sys_pread64			__compat_sys_ia32_x86_pread
+181	i386	pwrite64		sys_pwrite64			__compat_sys_ia32_x86_pwrite
+182	i386	chown			sys_chown16			__sys_ia32_chown16
+183	i386	getcwd			sys_getcwd			__sys_ia32_getcwd
+184	i386	capget			sys_capget			__sys_ia32_capget
+185	i386	capset			sys_capset			__sys_ia32_capset
+186	i386	sigaltstack		sys_sigaltstack			__compat_sys_ia32_sigaltstack
+187	i386	sendfile		sys_sendfile			__compat_sys_ia32_sendfile
 188	i386	getpmsg
 189	i386	putpmsg
 190	i386	vfork			sys_vfork
-191	i386	ugetrlimit		sys_getrlimit			compat_sys_getrlimit
-192	i386	mmap2			sys_mmap_pgoff
-193	i386	truncate64		sys_truncate64			compat_sys_x86_truncate64
-194	i386	ftruncate64		sys_ftruncate64			compat_sys_x86_ftruncate64
-195	i386	stat64			sys_stat64			compat_sys_x86_stat64
-196	i386	lstat64			sys_lstat64			compat_sys_x86_lstat64
-197	i386	fstat64			sys_fstat64			compat_sys_x86_fstat64
-198	i386	lchown32		sys_lchown
+191	i386	ugetrlimit		sys_getrlimit			__compat_sys_ia32_getrlimit
+192	i386	mmap2			sys_mmap_pgoff			__sys_ia32_mmap_pgoff
+193	i386	truncate64		sys_truncate64			__compat_sys_ia32_x86_truncate64
+194	i386	ftruncate64		sys_ftruncate64			__compat_sys_ia32_x86_ftruncate64
+195	i386	stat64			sys_stat64			__compat_sys_ia32_x86_stat64
+196	i386	lstat64			sys_lstat64			__compat_sys_ia32_x86_lstat64
+197	i386	fstat64			sys_fstat64			__compat_sys_ia32_x86_fstat64
+198	i386	lchown32		sys_lchown			__sys_ia32_lchown
 199	i386	getuid32		sys_getuid
 200	i386	getgid32		sys_getgid
 201	i386	geteuid32		sys_geteuid
 202	i386	getegid32		sys_getegid
-203	i386	setreuid32		sys_setreuid
-204	i386	setregid32		sys_setregid
-205	i386	getgroups32		sys_getgroups
-206	i386	setgroups32		sys_setgroups
-207	i386	fchown32		sys_fchown
-208	i386	setresuid32		sys_setresuid
-209	i386	getresuid32		sys_getresuid
-210	i386	setresgid32		sys_setresgid
-211	i386	getresgid32		sys_getresgid
-212	i386	chown32			sys_chown
-213	i386	setuid32		sys_setuid
-214	i386	setgid32		sys_setgid
-215	i386	setfsuid32		sys_setfsuid
-216	i386	setfsgid32		sys_setfsgid
-217	i386	pivot_root		sys_pivot_root
-218	i386	mincore			sys_mincore
-219	i386	madvise			sys_madvise
-220	i386	getdents64		sys_getdents64
-221	i386	fcntl64			sys_fcntl64			compat_sys_fcntl64
+203	i386	setreuid32		sys_setreuid			__sys_ia32_setreuid
+204	i386	setregid32		sys_setregid			__sys_ia32_setregid
+205	i386	getgroups32		sys_getgroups			__sys_ia32_getgroups
+206	i386	setgroups32		sys_setgroups			__sys_ia32_setgroups
+207	i386	fchown32		sys_fchown			__sys_ia32_fchown
+208	i386	setresuid32		sys_setresuid			__sys_ia32_setresuid
+209	i386	getresuid32		sys_getresuid			__sys_ia32_getresuid
+210	i386	setresgid32		sys_setresgid			__sys_ia32_setresgid
+211	i386	getresgid32		sys_getresgid			__sys_ia32_getresgid
+212	i386	chown32			sys_chown			__sys_ia32_chown
+213	i386	setuid32		sys_setuid			__sys_ia32_setuid
+214	i386	setgid32		sys_setgid			__sys_ia32_setgid
+215	i386	setfsuid32		sys_setfsuid			__sys_ia32_setfsuid
+216	i386	setfsgid32		sys_setfsgid			__sys_ia32_setfsgid
+217	i386	pivot_root		sys_pivot_root			__sys_ia32_pivot_root
+218	i386	mincore			sys_mincore			__sys_ia32_mincore
+219	i386	madvise			sys_madvise			__sys_ia32_madvise
+220	i386	getdents64		sys_getdents64			__sys_ia32_getdents64
+221	i386	fcntl64			sys_fcntl64			__compat_sys_ia32_fcntl64
 # 222 is unused
 # 223 is unused
 224	i386	gettid			sys_gettid
-225	i386	readahead		sys_readahead			compat_sys_x86_readahead
-226	i386	setxattr		sys_setxattr
-227	i386	lsetxattr		sys_lsetxattr
-228	i386	fsetxattr		sys_fsetxattr
-229	i386	getxattr		sys_getxattr
-230	i386	lgetxattr		sys_lgetxattr
-231	i386	fgetxattr		sys_fgetxattr
-232	i386	listxattr		sys_listxattr
-233	i386	llistxattr		sys_llistxattr
-234	i386	flistxattr		sys_flistxattr
-235	i386	removexattr		sys_removexattr
-236	i386	lremovexattr		sys_lremovexattr
-237	i386	fremovexattr		sys_fremovexattr
-238	i386	tkill			sys_tkill
-239	i386	sendfile64		sys_sendfile64
-240	i386	futex			sys_futex			compat_sys_futex
-241	i386	sched_setaffinity	sys_sched_setaffinity		compat_sys_sched_setaffinity
-242	i386	sched_getaffinity	sys_sched_getaffinity		compat_sys_sched_getaffinity
-243	i386	set_thread_area		sys_set_thread_area
-244	i386	get_thread_area		sys_get_thread_area
-245	i386	io_setup		sys_io_setup			compat_sys_io_setup
-246	i386	io_destroy		sys_io_destroy
-247	i386	io_getevents		sys_io_getevents		compat_sys_io_getevents
-248	i386	io_submit		sys_io_submit			compat_sys_io_submit
-249	i386	io_cancel		sys_io_cancel
-250	i386	fadvise64		sys_fadvise64			compat_sys_x86_fadvise64
+225	i386	readahead		sys_readahead			__compat_sys_ia32_x86_readahead
+226	i386	setxattr		sys_setxattr			__sys_ia32_setxattr
+227	i386	lsetxattr		sys_lsetxattr			__sys_ia32_lsetxattr
+228	i386	fsetxattr		sys_fsetxattr			__sys_ia32_fsetxattr
+229	i386	getxattr		sys_getxattr			__sys_ia32_getxattr
+230	i386	lgetxattr		sys_lgetxattr			__sys_ia32_lgetxattr
+231	i386	fgetxattr		sys_fgetxattr			__sys_ia32_fgetxattr
+232	i386	listxattr		sys_listxattr			__sys_ia32_listxattr
+233	i386	llistxattr		sys_llistxattr			__sys_ia32_llistxattr
+234	i386	flistxattr		sys_flistxattr			__sys_ia32_flistxattr
+235	i386	removexattr		sys_removexattr			__sys_ia32_removexattr
+236	i386	lremovexattr		sys_lremovexattr		__sys_ia32_lremovexattr
+237	i386	fremovexattr		sys_fremovexattr		__sys_ia32_fremovexattr
+238	i386	tkill			sys_tkill			__sys_ia32_tkill
+239	i386	sendfile64		sys_sendfile64			__sys_ia32_sendfile64
+240	i386	futex			sys_futex			__compat_sys_ia32_futex
+241	i386	sched_setaffinity	sys_sched_setaffinity		__compat_sys_ia32_sched_setaffinity
+242	i386	sched_getaffinity	sys_sched_getaffinity		__compat_sys_ia32_sched_getaffinity
+243	i386	set_thread_area		sys_set_thread_area		__sys_ia32_set_thread_area
+244	i386	get_thread_area		sys_get_thread_area		__sys_ia32_get_thread_area
+245	i386	io_setup		sys_io_setup			__compat_sys_ia32_io_setup
+246	i386	io_destroy		sys_io_destroy			__sys_ia32_io_destroy
+247	i386	io_getevents		sys_io_getevents		__compat_sys_ia32_io_getevents
+248	i386	io_submit		sys_io_submit			__compat_sys_ia32_io_submit
+249	i386	io_cancel		sys_io_cancel			__sys_ia32_io_cancel
+250	i386	fadvise64		sys_fadvise64			__compat_sys_ia32_x86_fadvise64
 # 251 is available for reuse (was briefly sys_set_zone_reclaim)
-252	i386	exit_group		sys_exit_group
-253	i386	lookup_dcookie		sys_lookup_dcookie		compat_sys_lookup_dcookie
-254	i386	epoll_create		sys_epoll_create
-255	i386	epoll_ctl		sys_epoll_ctl
-256	i386	epoll_wait		sys_epoll_wait
-257	i386	remap_file_pages	sys_remap_file_pages
-258	i386	set_tid_address		sys_set_tid_address
-259	i386	timer_create		sys_timer_create		compat_sys_timer_create
-260	i386	timer_settime		sys_timer_settime		compat_sys_timer_settime
-261	i386	timer_gettime		sys_timer_gettime		compat_sys_timer_gettime
-262	i386	timer_getoverrun	sys_timer_getoverrun
-263	i386	timer_delete		sys_timer_delete
-264	i386	clock_settime		sys_clock_settime		compat_sys_clock_settime
-265	i386	clock_gettime		sys_clock_gettime		compat_sys_clock_gettime
-266	i386	clock_getres		sys_clock_getres		compat_sys_clock_getres
-267	i386	clock_nanosleep		sys_clock_nanosleep		compat_sys_clock_nanosleep
-268	i386	statfs64		sys_statfs64			compat_sys_statfs64
-269	i386	fstatfs64		sys_fstatfs64			compat_sys_fstatfs64
-270	i386	tgkill			sys_tgkill
-271	i386	utimes			sys_utimes			compat_sys_utimes
-272	i386	fadvise64_64		sys_fadvise64_64		compat_sys_x86_fadvise64_64
+252	i386	exit_group		sys_exit_group			__sys_ia32_exit_group
+253	i386	lookup_dcookie		sys_lookup_dcookie		__compat_sys_ia32_lookup_dcookie
+254	i386	epoll_create		sys_epoll_create		__sys_ia32_epoll_create
+255	i386	epoll_ctl		sys_epoll_ctl			__sys_ia32_epoll_ctl
+256	i386	epoll_wait		sys_epoll_wait			__sys_ia32_epoll_wait
+257	i386	remap_file_pages	sys_remap_file_pages		__sys_ia32_remap_file_pages
+258	i386	set_tid_address		sys_set_tid_address		__sys_ia32_set_tid_address
+259	i386	timer_create		sys_timer_create		__compat_sys_ia32_timer_create
+260	i386	timer_settime		sys_timer_settime		__compat_sys_ia32_timer_settime
+261	i386	timer_gettime		sys_timer_gettime		__compat_sys_ia32_timer_gettime
+262	i386	timer_getoverrun	sys_timer_getoverrun		__sys_ia32_timer_getoverrun
+263	i386	timer_delete		sys_timer_delete		__sys_ia32_timer_delete
+264	i386	clock_settime		sys_clock_settime		__compat_sys_ia32_clock_settime
+265	i386	clock_gettime		sys_clock_gettime		__compat_sys_ia32_clock_gettime
+266	i386	clock_getres		sys_clock_getres		__compat_sys_ia32_clock_getres
+267	i386	clock_nanosleep		sys_clock_nanosleep		__compat_sys_ia32_clock_nanosleep
+268	i386	statfs64		sys_statfs64			__compat_sys_ia32_statfs64
+269	i386	fstatfs64		sys_fstatfs64			__compat_sys_ia32_fstatfs64
+270	i386	tgkill			sys_tgkill			__sys_ia32_tgkill
+271	i386	utimes			sys_utimes			__compat_sys_ia32_utimes
+272	i386	fadvise64_64		sys_fadvise64_64		__compat_sys_ia32_x86_fadvise64_64
 273	i386	vserver
-274	i386	mbind			sys_mbind
-275	i386	get_mempolicy		sys_get_mempolicy		compat_sys_get_mempolicy
-276	i386	set_mempolicy		sys_set_mempolicy
-277	i386	mq_open			sys_mq_open			compat_sys_mq_open
-278	i386	mq_unlink		sys_mq_unlink
-279	i386	mq_timedsend		sys_mq_timedsend		compat_sys_mq_timedsend
-280	i386	mq_timedreceive		sys_mq_timedreceive		compat_sys_mq_timedreceive
-281	i386	mq_notify		sys_mq_notify			compat_sys_mq_notify
-282	i386	mq_getsetattr		sys_mq_getsetattr		compat_sys_mq_getsetattr
-283	i386	kexec_load		sys_kexec_load			compat_sys_kexec_load
-284	i386	waitid			sys_waitid			compat_sys_waitid
+274	i386	mbind			sys_mbind			__sys_ia32_mbind
+275	i386	get_mempolicy		sys_get_mempolicy		__compat_sys_ia32_get_mempolicy
+276	i386	set_mempolicy		sys_set_mempolicy		__sys_ia32_set_mempolicy
+277	i386	mq_open			sys_mq_open			__compat_sys_ia32_mq_open
+278	i386	mq_unlink		sys_mq_unlink			__sys_ia32_mq_unlink
+279	i386	mq_timedsend		sys_mq_timedsend		__compat_sys_ia32_mq_timedsend
+280	i386	mq_timedreceive		sys_mq_timedreceive		__compat_sys_ia32_mq_timedreceive
+281	i386	mq_notify		sys_mq_notify			__compat_sys_ia32_mq_notify
+282	i386	mq_getsetattr		sys_mq_getsetattr		__compat_sys_ia32_mq_getsetattr
+283	i386	kexec_load		sys_kexec_load			__compat_sys_ia32_kexec_load
+284	i386	waitid			sys_waitid			__compat_sys_ia32_waitid
 # 285 sys_setaltroot
-286	i386	add_key			sys_add_key
-287	i386	request_key		sys_request_key
-288	i386	keyctl			sys_keyctl			compat_sys_keyctl
-289	i386	ioprio_set		sys_ioprio_set
-290	i386	ioprio_get		sys_ioprio_get
+286	i386	add_key			sys_add_key			__sys_ia32_add_key
+287	i386	request_key		sys_request_key			__sys_ia32_request_key
+288	i386	keyctl			sys_keyctl			__compat_sys_ia32_keyctl
+289	i386	ioprio_set		sys_ioprio_set			__sys_ia32_ioprio_set
+290	i386	ioprio_get		sys_ioprio_get			__sys_ia32_ioprio_get
 291	i386	inotify_init		sys_inotify_init
-292	i386	inotify_add_watch	sys_inotify_add_watch
-293	i386	inotify_rm_watch	sys_inotify_rm_watch
-294	i386	migrate_pages		sys_migrate_pages
-295	i386	openat			sys_openat			compat_sys_openat
-296	i386	mkdirat			sys_mkdirat
-297	i386	mknodat			sys_mknodat
-298	i386	fchownat		sys_fchownat
-299	i386	futimesat		sys_futimesat			compat_sys_futimesat
-300	i386	fstatat64		sys_fstatat64			compat_sys_x86_fstatat
-301	i386	unlinkat		sys_unlinkat
-302	i386	renameat		sys_renameat
-303	i386	linkat			sys_linkat
-304	i386	symlinkat		sys_symlinkat
-305	i386	readlinkat		sys_readlinkat
-306	i386	fchmodat		sys_fchmodat
-307	i386	faccessat		sys_faccessat
-308	i386	pselect6		sys_pselect6			compat_sys_pselect6
-309	i386	ppoll			sys_ppoll			compat_sys_ppoll
-310	i386	unshare			sys_unshare
-311	i386	set_robust_list		sys_set_robust_list		compat_sys_set_robust_list
-312	i386	get_robust_list		sys_get_robust_list		compat_sys_get_robust_list
-313	i386	splice			sys_splice
-314	i386	sync_file_range		sys_sync_file_range		compat_sys_x86_sync_file_range
-315	i386	tee			sys_tee
-316	i386	vmsplice		sys_vmsplice			compat_sys_vmsplice
-317	i386	move_pages		sys_move_pages			compat_sys_move_pages
-318	i386	getcpu			sys_getcpu
-319	i386	epoll_pwait		sys_epoll_pwait
-320	i386	utimensat		sys_utimensat			compat_sys_utimensat
-321	i386	signalfd		sys_signalfd			compat_sys_signalfd
-322	i386	timerfd_create		sys_timerfd_create
-323	i386	eventfd			sys_eventfd
-324	i386	fallocate		sys_fallocate			compat_sys_x86_fallocate
-325	i386	timerfd_settime		sys_timerfd_settime		compat_sys_timerfd_settime
-326	i386	timerfd_gettime		sys_timerfd_gettime		compat_sys_timerfd_gettime
-327	i386	signalfd4		sys_signalfd4			compat_sys_signalfd4
-328	i386	eventfd2		sys_eventfd2
-329	i386	epoll_create1		sys_epoll_create1
-330	i386	dup3			sys_dup3
-331	i386	pipe2			sys_pipe2
-332	i386	inotify_init1		sys_inotify_init1
-333	i386	preadv			sys_preadv			compat_sys_preadv
-334	i386	pwritev			sys_pwritev			compat_sys_pwritev
-335	i386	rt_tgsigqueueinfo	sys_rt_tgsigqueueinfo		compat_sys_rt_tgsigqueueinfo
-336	i386	perf_event_open		sys_perf_event_open
-337	i386	recvmmsg		sys_recvmmsg			compat_sys_recvmmsg
-338	i386	fanotify_init		sys_fanotify_init
-339	i386	fanotify_mark		sys_fanotify_mark		compat_sys_fanotify_mark
-340	i386	prlimit64		sys_prlimit64
-341	i386	name_to_handle_at	sys_name_to_handle_at
-342	i386	open_by_handle_at	sys_open_by_handle_at		compat_sys_open_by_handle_at
-343	i386	clock_adjtime		sys_clock_adjtime		compat_sys_clock_adjtime
-344	i386	syncfs			sys_syncfs
-345	i386	sendmmsg		sys_sendmmsg			compat_sys_sendmmsg
-346	i386	setns			sys_setns
-347	i386	process_vm_readv	sys_process_vm_readv		compat_sys_process_vm_readv
-348	i386	process_vm_writev	sys_process_vm_writev		compat_sys_process_vm_writev
-349	i386	kcmp			sys_kcmp
-350	i386	finit_module		sys_finit_module
-351	i386	sched_setattr		sys_sched_setattr
-352	i386	sched_getattr		sys_sched_getattr
-353	i386	renameat2		sys_renameat2
-354	i386	seccomp			sys_seccomp
-355	i386	getrandom		sys_getrandom
-356	i386	memfd_create		sys_memfd_create
-357	i386	bpf			sys_bpf
-358	i386	execveat		sys_execveat			compat_sys_execveat
-359	i386	socket			sys_socket
-360	i386	socketpair		sys_socketpair
-361	i386	bind			sys_bind
-362	i386	connect			sys_connect
-363	i386	listen			sys_listen
-364	i386	accept4			sys_accept4
-365	i386	getsockopt		sys_getsockopt			compat_sys_getsockopt
-366	i386	setsockopt		sys_setsockopt			compat_sys_setsockopt
-367	i386	getsockname		sys_getsockname
-368	i386	getpeername		sys_getpeername
-369	i386	sendto			sys_sendto
-370	i386	sendmsg			sys_sendmsg			compat_sys_sendmsg
-371	i386	recvfrom		sys_recvfrom			compat_sys_recvfrom
-372	i386	recvmsg			sys_recvmsg			compat_sys_recvmsg
-373	i386	shutdown		sys_shutdown
-374	i386	userfaultfd		sys_userfaultfd
-375	i386	membarrier		sys_membarrier
-376	i386	mlock2			sys_mlock2
-377	i386	copy_file_range		sys_copy_file_range
-378	i386	preadv2			sys_preadv2			compat_sys_preadv2
-379	i386	pwritev2		sys_pwritev2			compat_sys_pwritev2
-380	i386	pkey_mprotect		sys_pkey_mprotect
-381	i386	pkey_alloc		sys_pkey_alloc
-382	i386	pkey_free		sys_pkey_free
-383	i386	statx			sys_statx
-384	i386	arch_prctl		sys_arch_prctl			compat_sys_arch_prctl
+292	i386	inotify_add_watch	sys_inotify_add_watch		__sys_ia32_inotify_add_watch
+293	i386	inotify_rm_watch	sys_inotify_rm_watch		__sys_ia32_inotify_rm_watch
+294	i386	migrate_pages		sys_migrate_pages		__sys_ia32_migrate_pages
+295	i386	openat			sys_openat			__compat_sys_ia32_openat
+296	i386	mkdirat			sys_mkdirat			__sys_ia32_mkdirat
+297	i386	mknodat			sys_mknodat			__sys_ia32_mknodat
+298	i386	fchownat		sys_fchownat			__sys_ia32_fchownat
+299	i386	futimesat		sys_futimesat			__compat_sys_ia32_futimesat
+300	i386	fstatat64		sys_fstatat64			__compat_sys_ia32_x86_fstatat
+301	i386	unlinkat		sys_unlinkat			__sys_ia32_unlinkat
+302	i386	renameat		sys_renameat			__sys_ia32_renameat
+303	i386	linkat			sys_linkat			__sys_ia32_linkat
+304	i386	symlinkat		sys_symlinkat			__sys_ia32_symlinkat
+305	i386	readlinkat		sys_readlinkat			__sys_ia32_readlinkat
+306	i386	fchmodat		sys_fchmodat			__sys_ia32_fchmodat
+307	i386	faccessat		sys_faccessat			__sys_ia32_faccessat
+308	i386	pselect6		sys_pselect6			__compat_sys_ia32_pselect6
+309	i386	ppoll			sys_ppoll			__compat_sys_ia32_ppoll
+310	i386	unshare			sys_unshare			__sys_ia32_unshare
+311	i386	set_robust_list		sys_set_robust_list		__compat_sys_ia32_set_robust_list
+312	i386	get_robust_list		sys_get_robust_list		__compat_sys_ia32_get_robust_list
+313	i386	splice			sys_splice			__sys_ia32_splice
+314	i386	sync_file_range		sys_sync_file_range		__compat_sys_ia32_x86_sync_file_range
+315	i386	tee			sys_tee				__sys_ia32_tee
+316	i386	vmsplice		sys_vmsplice			__compat_sys_ia32_vmsplice
+317	i386	move_pages		sys_move_pages			__compat_sys_ia32_move_pages
+318	i386	getcpu			sys_getcpu			__sys_ia32_getcpu
+319	i386	epoll_pwait		sys_epoll_pwait			__sys_ia32_epoll_pwait
+320	i386	utimensat		sys_utimensat			__compat_sys_ia32_utimensat
+321	i386	signalfd		sys_signalfd			__compat_sys_ia32_signalfd
+322	i386	timerfd_create		sys_timerfd_create		__sys_ia32_timerfd_create
+323	i386	eventfd			sys_eventfd			__sys_ia32_eventfd
+324	i386	fallocate		sys_fallocate			__compat_sys_ia32_x86_fallocate
+325	i386	timerfd_settime		sys_timerfd_settime		__compat_sys_ia32_timerfd_settime
+326	i386	timerfd_gettime		sys_timerfd_gettime		__compat_sys_ia32_timerfd_gettime
+327	i386	signalfd4		sys_signalfd4			__compat_sys_ia32_signalfd4
+328	i386	eventfd2		sys_eventfd2			__sys_ia32_eventfd2
+329	i386	epoll_create1		sys_epoll_create1		__sys_ia32_epoll_create1
+330	i386	dup3			sys_dup3			__sys_ia32_dup3
+331	i386	pipe2			sys_pipe2			__sys_ia32_pipe2
+332	i386	inotify_init1		sys_inotify_init1		__sys_ia32_inotify_init1
+333	i386	preadv			sys_preadv			__compat_sys_ia32_preadv
+334	i386	pwritev			sys_pwritev			__compat_sys_ia32_pwritev
+335	i386	rt_tgsigqueueinfo	sys_rt_tgsigqueueinfo		__compat_sys_ia32_rt_tgsigqueueinfo
+336	i386	perf_event_open		sys_perf_event_open		__sys_ia32_perf_event_open
+337	i386	recvmmsg		sys_recvmmsg			__compat_sys_ia32_recvmmsg
+338	i386	fanotify_init		sys_fanotify_init		__sys_ia32_fanotify_init
+339	i386	fanotify_mark		sys_fanotify_mark		__compat_sys_ia32_fanotify_mark
+340	i386	prlimit64		sys_prlimit64			__sys_ia32_prlimit64
+341	i386	name_to_handle_at	sys_name_to_handle_at		__sys_ia32_name_to_handle_at
+342	i386	open_by_handle_at	sys_open_by_handle_at		__compat_sys_ia32_open_by_handle_at
+343	i386	clock_adjtime		sys_clock_adjtime		__compat_sys_ia32_clock_adjtime
+344	i386	syncfs			sys_syncfs			__sys_ia32_syncfs
+345	i386	sendmmsg		sys_sendmmsg			__compat_sys_ia32_sendmmsg
+346	i386	setns			sys_setns			__sys_ia32_setns
+347	i386	process_vm_readv	sys_process_vm_readv		__compat_sys_ia32_process_vm_readv
+348	i386	process_vm_writev	sys_process_vm_writev		__compat_sys_ia32_process_vm_writev
+349	i386	kcmp			sys_kcmp			__sys_ia32_kcmp
+350	i386	finit_module		sys_finit_module		__sys_ia32_finit_module
+351	i386	sched_setattr		sys_sched_setattr		__sys_ia32_sched_setattr
+352	i386	sched_getattr		sys_sched_getattr		__sys_ia32_sched_getattr
+353	i386	renameat2		sys_renameat2			__sys_ia32_renameat2
+354	i386	seccomp			sys_seccomp			__sys_ia32_seccomp
+355	i386	getrandom		sys_getrandom			__sys_ia32_getrandom
+356	i386	memfd_create		sys_memfd_create		__sys_ia32_memfd_create
+357	i386	bpf			sys_bpf				__sys_ia32_bpf
+358	i386	execveat		sys_execveat			__compat_sys_ia32_execveat
+359	i386	socket			sys_socket			__sys_ia32_socket
+360	i386	socketpair		sys_socketpair			__sys_ia32_socketpair
+361	i386	bind			sys_bind			__sys_ia32_bind
+362	i386	connect			sys_connect			__sys_ia32_connect
+363	i386	listen			sys_listen			__sys_ia32_listen
+364	i386	accept4			sys_accept4			__sys_ia32_accept4
+365	i386	getsockopt		sys_getsockopt			__compat_sys_ia32_getsockopt
+366	i386	setsockopt		sys_setsockopt			__compat_sys_ia32_setsockopt
+367	i386	getsockname		sys_getsockname			__sys_ia32_getsockname
+368	i386	getpeername		sys_getpeername			__sys_ia32_getpeername
+369	i386	sendto			sys_sendto			__sys_ia32_sendto
+370	i386	sendmsg			sys_sendmsg			__compat_sys_ia32_sendmsg
+371	i386	recvfrom		sys_recvfrom			__compat_sys_ia32_recvfrom
+372	i386	recvmsg			sys_recvmsg			__compat_sys_ia32_recvmsg
+373	i386	shutdown		sys_shutdown			__sys_ia32_shutdown
+374	i386	userfaultfd		sys_userfaultfd			__sys_ia32_userfaultfd
+375	i386	membarrier		sys_membarrier			__sys_ia32_membarrier
+376	i386	mlock2			sys_mlock2			__sys_ia32_mlock2
+377	i386	copy_file_range		sys_copy_file_range		__sys_ia32_copy_file_range
+378	i386	preadv2			sys_preadv2			__compat_sys_ia32_preadv2
+379	i386	pwritev2		sys_pwritev2			__compat_sys_ia32_pwritev2
+380	i386	pkey_mprotect		sys_pkey_mprotect		__sys_ia32_pkey_mprotect
+381	i386	pkey_alloc		sys_pkey_alloc			__sys_ia32_pkey_alloc
+382	i386	pkey_free		sys_pkey_free			__sys_ia32_pkey_free
+383	i386	statx			sys_statx			__sys_ia32_statx
+384	i386	arch_prctl		sys_arch_prctl			__compat_sys_ia32_arch_prctl
--- a/arch/x86/entry/syscalls/syscall_64.tbl
+++ b/arch/x86/entry/syscalls/syscall_64.tbl
@ -342,41 +342,43 @@

 #
 # x32-specific system call numbers start at 512 to avoid cache impact
-# for native 64-bit operation.
+# for native 64-bit operation. The __compat_sys_x32 stubs are created
+# on-the-fly for compat_sys_*() compatibility system calls if X86_X32
+# is defined.
 #
-512	x32	rt_sigaction		compat_sys_rt_sigaction
+512	x32	rt_sigaction		__compat_sys_x32_rt_sigaction
 513	x32	rt_sigreturn		sys32_x32_rt_sigreturn
-514	x32	ioctl			compat_sys_ioctl
-515	x32	readv			compat_sys_readv
-516	x32	writev			compat_sys_writev
-517	x32	recvfrom		compat_sys_recvfrom
-518	x32	sendmsg			compat_sys_sendmsg
-519	x32	recvmsg			compat_sys_recvmsg
-520	x32	execve			compat_sys_execve/ptregs
-521	x32	ptrace			compat_sys_ptrace
-522	x32	rt_sigpending		compat_sys_rt_sigpending
-523	x32	rt_sigtimedwait		compat_sys_rt_sigtimedwait
-524	x32	rt_sigqueueinfo		compat_sys_rt_sigqueueinfo
-525	x32	sigaltstack		compat_sys_sigaltstack
-526	x32	timer_create		compat_sys_timer_create
-527	x32	mq_notify		compat_sys_mq_notify
-528	x32	kexec_load		compat_sys_kexec_load
-529	x32	waitid			compat_sys_waitid
-530	x32	set_robust_list		compat_sys_set_robust_list
-531	x32	get_robust_list		compat_sys_get_robust_list
-532	x32	vmsplice		compat_sys_vmsplice
-533	x32	move_pages		compat_sys_move_pages
-534	x32	preadv			compat_sys_preadv64
-535	x32	pwritev			compat_sys_pwritev64
-536	x32	rt_tgsigqueueinfo	compat_sys_rt_tgsigqueueinfo
-537	x32	recvmmsg		compat_sys_recvmmsg
-538	x32	sendmmsg		compat_sys_sendmmsg
-539	x32	process_vm_readv	compat_sys_process_vm_readv
-540	x32	process_vm_writev	compat_sys_process_vm_writev
-541	x32	setsockopt		compat_sys_setsockopt
-542	x32	getsockopt		compat_sys_getsockopt
-543	x32	io_setup		compat_sys_io_setup
-544	x32	io_submit		compat_sys_io_submit
-545	x32	execveat		compat_sys_execveat/ptregs
-546	x32	preadv2			compat_sys_preadv64v2
-547	x32	pwritev2		compat_sys_pwritev64v2
+514	x32	ioctl			__compat_sys_x32_ioctl
+515	x32	readv			__compat_sys_x32_readv
+516	x32	writev			__compat_sys_x32_writev
+517	x32	recvfrom		__compat_sys_x32_recvfrom
+518	x32	sendmsg			__compat_sys_x32_sendmsg
+519	x32	recvmsg			__compat_sys_x32_recvmsg
+520	x32	execve			__compat_sys_x32_execve/ptregs
+521	x32	ptrace			__compat_sys_x32_ptrace
+522	x32	rt_sigpending		__compat_sys_x32_rt_sigpending
+523	x32	rt_sigtimedwait		__compat_sys_x32_rt_sigtimedwait
+524	x32	rt_sigqueueinfo		__compat_sys_x32_rt_sigqueueinfo
+525	x32	sigaltstack		__compat_sys_x32_sigaltstack
+526	x32	timer_create		__compat_sys_x32_timer_create
+527	x32	mq_notify		__compat_sys_x32_mq_notify
+528	x32	kexec_load		__compat_sys_x32_kexec_load
+529	x32	waitid			__compat_sys_x32_waitid
+530	x32	set_robust_list		__compat_sys_x32_set_robust_list
+531	x32	get_robust_list		__compat_sys_x32_get_robust_list
+532	x32	vmsplice		__compat_sys_x32_vmsplice
+533	x32	move_pages		__compat_sys_x32_move_pages
+534	x32	preadv			__compat_sys_x32_preadv64
+535	x32	pwritev			__compat_sys_x32_pwritev64
+536	x32	rt_tgsigqueueinfo	__compat_sys_x32_rt_tgsigqueueinfo
+537	x32	recvmmsg		__compat_sys_x32_recvmmsg
+538	x32	sendmmsg		__compat_sys_x32_sendmmsg
+539	x32	process_vm_readv	__compat_sys_x32_process_vm_readv
+540	x32	process_vm_writev	__compat_sys_x32_process_vm_writev
+541	x32	setsockopt		__compat_sys_x32_setsockopt
+542	x32	getsockopt		__compat_sys_x32_getsockopt
+543	x32	io_setup		__compat_sys_x32_io_setup
+544	x32	io_submit		__compat_sys_x32_io_submit
+545	x32	execveat		__compat_sys_x32_execveat/ptregs
+546	x32	preadv2			__compat_sys_x32_preadv64v2
+547	x32	pwritev2		__compat_sys_x32_pwritev64v2
--- a/arch/x86/include/asm/syscall_wrapper.h
+++ b/arch/x86/include/asm/syscall_wrapper.h
@ -6,6 +6,111 @@
 #ifndef _ASM_X86_SYSCALL_WRAPPER_H
 #define _ASM_X86_SYSCALL_WRAPPER_H

+/* Mapping of registers to parameters for syscalls on x86-64 and x32 */
+#define SC_X86_64_REGS_TO_ARGS(x, ...)					\
+	__MAP(x,__SC_ARGS						\
+		,,regs->di,,regs->si,,regs->dx				\
+		,,regs->r10,,regs->r8,,regs->r9)			\
+
+/* Mapping of registers to parameters for syscalls on i386 */
+#define SC_IA32_REGS_TO_ARGS(x, ...)					\
+	__MAP(x,__SC_ARGS						\
+	      ,,(unsigned int)regs->bx,,(unsigned int)regs->cx		\
+	      ,,(unsigned int)regs->dx,,(unsigned int)regs->si		\
+	      ,,(unsigned int)regs->di,,(unsigned int)regs->bp)
+
+#ifdef CONFIG_IA32_EMULATION
+/*
+ * For IA32 emulation, we need to handle "compat" syscalls *and* create
+ * additional wrappers (aptly named __sys_ia32_sys_xyzzy) which decode the
+ * ia32 regs in the proper order for shared or "common" syscalls. As some
+ * syscalls may not be implemented, we need to expand COND_SYSCALL in
+ * kernel/sys_ni.c and SYS_NI in kernel/time/posix-stubs.c to cover this
+ * case as well.
+ */
+#define COMPAT_SC_IA32_STUBx(x, name, ...)				\
+	asmlinkage long __compat_sys_ia32##name(const struct pt_regs *regs);\
+	ALLOW_ERROR_INJECTION(__compat_sys_ia32##name, ERRNO);		\
+	asmlinkage long __compat_sys_ia32##name(const struct pt_regs *regs)\
+	{								\
+		return c_SyS##name(SC_IA32_REGS_TO_ARGS(x,__VA_ARGS__));\
+	}								\
+
+#define SC_IA32_WRAPPERx(x, name, ...)					\
+	asmlinkage long __sys_ia32##name(const struct pt_regs *regs);	\
+	ALLOW_ERROR_INJECTION(__sys_ia32##name, ERRNO);			\
+	asmlinkage long __sys_ia32##name(const struct pt_regs *regs)	\
+	{								\
+		return SyS##name(SC_IA32_REGS_TO_ARGS(x,__VA_ARGS__));	\
+	}
+
+#define COND_SYSCALL(name)						\
+	cond_syscall(sys_##name);					\
+	cond_syscall(__sys_ia32_##name)
+
+#define SYS_NI(name)							\
+	SYSCALL_ALIAS(sys_##name, sys_ni_posix_timers);			\
+	SYSCALL_ALIAS(__sys_ia32_##name, sys_ni_posix_timers)
+
+#else /* CONFIG_IA32_EMULATION */
+#define COMPAT_SC_IA32_STUBx(x, name, ...)
+#define SC_IA32_WRAPPERx(x, fullname, name, ...)
+#endif /* CONFIG_IA32_EMULATION */
+
+
+#ifdef CONFIG_X86_X32
+/*
+ * For the x32 ABI, we need to create a stub for compat_sys_*() which is aware
+ * of the x86-64-style parameter ordering of x32 syscalls. The syscalls common
+ * with x86_64 obviously do not need such care.
+ */
+#define COMPAT_SC_X32_STUBx(x, name, ...)				\
+	asmlinkage long __compat_sys_x32##name(const struct pt_regs *regs);\
+	ALLOW_ERROR_INJECTION(__compat_sys_x32##name, ERRNO);		\
+	asmlinkage long __compat_sys_x32##name(const struct pt_regs *regs)\
+	{								\
+		return c_SyS##name(SC_X86_64_REGS_TO_ARGS(x,__VA_ARGS__));\
+	}								\
+
+#else /* CONFIG_X86_X32 */
+#define COMPAT_SC_X32_STUBx(x, name, ...)
+#endif /* CONFIG_X86_X32 */
+
+
+#ifdef CONFIG_COMPAT
+/*
+ * Compat means IA32_EMULATION and/or X86_X32. As they use a different
+ * mapping of registers to parameters, we need to generate stubs for each
+ * of them. There is no need to implement COMPAT_SYSCALL_DEFINE0, as it is
+ * unused on x86.
+ */
+#define COMPAT_SYSCALL_DEFINEx(x, name, ...)				\
+	static long c_SyS##name(__MAP(x,__SC_LONG,__VA_ARGS__));	\
+	static inline long C_SYSC##name(__MAP(x,__SC_DECL,__VA_ARGS__));\
+	COMPAT_SC_IA32_STUBx(x, name, __VA_ARGS__)			\
+	COMPAT_SC_X32_STUBx(x, name, __VA_ARGS__)			\
+	static long c_SyS##name(__MAP(x,__SC_LONG,__VA_ARGS__))		\
+	{								\
+		return C_SYSC##name(__MAP(x,__SC_DELOUSE,__VA_ARGS__));	\
+	}								\
+	static inline long C_SYSC##name(__MAP(x,__SC_DECL,__VA_ARGS__))
+
+/*
+ * As some compat syscalls may not be implemented, we need to expand
+ * COND_SYSCALL_COMPAT in kernel/sys_ni.c and COMPAT_SYS_NI in
+ * kernel/time/posix-stubs.c to cover this case as well.
+ */
+#define COND_SYSCALL_COMPAT(name) 					\
+	cond_syscall(__compat_sys_ia32_##name);				\
+	cond_syscall(__compat_sys_x32_##name)
+
+#define COMPAT_SYS_NI(name)						\
+	SYSCALL_ALIAS(__compat_sys_ia32_##name, sys_ni_posix_timers);	\
+	SYSCALL_ALIAS(__compat_sys_x32_##name, sys_ni_posix_timers)
+
+#endif /* CONFIG_COMPAT */
+
+
 /*
 * Instead of the generic __SYSCALL_DEFINEx() definition, this macro takes
 * struct pt_regs *regs as the only argument of the syscall stub named
@ -34,9 +139,14 @@
 * This approach avoids leaking random user-provided register content down
 * the call chain.
 *
+ * If IA32_EMULATION is enabled, this macro generates an additional wrapper
+ * named __sys_ia32_*() which decodes the struct pt_regs *regs according
+ * to the i386 calling convention (bx, cx, dx, si, di, bp).
+ *
 * As the generic SYSCALL_DEFINE0() macro does not decode any parameters for
 * obvious reasons, and passing struct pt_regs *regs to it in %rdi does not
- * hurt, there is no need to override it.
+ * hurt, there is no need to override it, or to define it differently for
+ * IA32_EMULATION.
 */
 #define __SYSCALL_DEFINEx(x, name, ...)					\
 	asmlinkage long sys##name(const struct pt_regs *regs);		\
@ -45,10 +155,9 @@
 	static inline long SYSC##name(__MAP(x,__SC_DECL,__VA_ARGS__));	\
 	asmlinkage long sys##name(const struct pt_regs *regs)		\
 	{								\
-		return SyS##name(__MAP(x,__SC_ARGS			\
-			,,regs->di,,regs->si,,regs->dx			\
-			,,regs->r10,,regs->r8,,regs->r9));		\
+		return SyS##name(SC_X86_64_REGS_TO_ARGS(x,__VA_ARGS__));\
 	}								\
+	SC_IA32_WRAPPERx(x, name, __VA_ARGS__)				\
 	static long SyS##name(__MAP(x,__SC_LONG,__VA_ARGS__))		\
 	{								\
 		long ret = SYSC##name(__MAP(x,__SC_CAST,__VA_ARGS__));	\