[PATCH 3/3] add the clone64() and unshare64() syscalls

From: sukadev
Date: Wed Apr 09 2008 - 18:36:28 EST

From: Cedric Le Goater <clg@xxxxxxxxxx>
Subject: [PATCH 3/3] add the clone64() and unshare64() syscalls

This patch adds 2 new syscalls :

long sys_clone64(unsigned long flags_high, unsigned long flags_low,
unsigned long newsp);

long sys_unshare64(unsigned long flags_high, unsigned long flags_low);

The current version of clone64() does not support CLONE_PARENT_SETTID and
CLONE_CHILD_CLEARTID because we would exceed the 6 registers limit of some
arches. It's possible to get around this limitation but we might not
need it as we already have clone()

Signed-off-by: Cedric Le Goater <clg@xxxxxxxxxx>
Signed-off-by: Sukadev Bhattiprolu <sukadev@xxxxxxxxxx>

---
arch/powerpc/kernel/entry_32.S | 8 ++++++++
arch/powerpc/kernel/entry_64.S | 5 +++++
arch/powerpc/kernel/process.c | 15 +++++++++++++++
arch/s390/kernel/compat_linux.c | 16 ++++++++++++++++
arch/s390/kernel/compat_wrapper.S | 6 ++++++
arch/s390/kernel/process.c | 15 +++++++++++++++
arch/s390/kernel/syscalls.S | 2 ++
arch/x86/ia32/ia32entry.S | 4 ++++
arch/x86/ia32/sys_ia32.c | 12 ++++++++++++
arch/x86/kernel/entry_64.S | 1 +
arch/x86/kernel/process_32.c | 14 ++++++++++++++
arch/x86/kernel/process_64.c | 15 +++++++++++++++
arch/x86/kernel/syscall_table_32.S | 2 ++
include/asm-powerpc/systbl.h | 2 ++
include/asm-powerpc/unistd.h | 4 +++-
include/asm-s390/unistd.h | 4 +++-
include/asm-x86/unistd_32.h | 2 ++
include/asm-x86/unistd_64.h | 4 ++++
include/linux/syscalls.h | 3 +++
kernel/fork.c | 7 +++++++
kernel/sys_ni.c | 3 +++
21 files changed, 142 insertions(+), 2 deletions(-)

Index: 2.6.25-rc2-mm1/arch/s390/kernel/syscalls.S
===================================================================
--- 2.6.25-rc2-mm1.orig/arch/s390/kernel/syscalls.S 2008-02-27 15:17:34.000000000 -0800
+++ 2.6.25-rc2-mm1/arch/s390/kernel/syscalls.S 2008-03-06 22:08:49.000000000 -0800
@@ -330,3 +330,5 @@ SYSCALL(sys_eventfd,sys_eventfd,sys_even
SYSCALL(sys_timerfd_create,sys_timerfd_create,sys_timerfd_create_wrapper)
SYSCALL(sys_timerfd_settime,sys_timerfd_settime,compat_sys_timerfd_settime_wrapper) /* 320 */
SYSCALL(sys_timerfd_gettime,sys_timerfd_gettime,compat_sys_timerfd_gettime_wrapper)
+SYSCALL(sys_clone64,sys_clone64,sys32_clone64)
+SYSCALL(sys_unshare64,sys_unshare64,sys_unshare64_wrapper)
Index: 2.6.25-rc2-mm1/arch/x86/kernel/syscall_table_32.S
===================================================================
--- 2.6.25-rc2-mm1.orig/arch/x86/kernel/syscall_table_32.S 2008-02-27 15:17:35.000000000 -0800
+++ 2.6.25-rc2-mm1/arch/x86/kernel/syscall_table_32.S 2008-03-06 22:08:49.000000000 -0800
@@ -326,3 +326,5 @@ ENTRY(sys_call_table)
.long sys_fallocate
.long sys_timerfd_settime /* 325 */
.long sys_timerfd_gettime
+ .long sys_clone64
+ .long sys_unshare64
Index: 2.6.25-rc2-mm1/include/asm-powerpc/systbl.h
===================================================================
--- 2.6.25-rc2-mm1.orig/include/asm-powerpc/systbl.h 2008-02-27 15:18:12.000000000 -0800
+++ 2.6.25-rc2-mm1/include/asm-powerpc/systbl.h 2008-03-06 22:08:49.000000000 -0800
@@ -316,3 +316,5 @@ COMPAT_SYS(fallocate)
SYSCALL(subpage_prot)
COMPAT_SYS_SPU(timerfd_settime)
COMPAT_SYS_SPU(timerfd_gettime)
+PPC_SYS(clone64)
+SYSCALL_SPU(unshare64)
Index: 2.6.25-rc2-mm1/include/asm-powerpc/unistd.h
===================================================================
--- 2.6.25-rc2-mm1.orig/include/asm-powerpc/unistd.h 2008-02-27 15:18:12.000000000 -0800
+++ 2.6.25-rc2-mm1/include/asm-powerpc/unistd.h 2008-03-06 22:08:49.000000000 -0800
@@ -335,10 +335,12 @@
#define __NR_subpage_prot 310
#define __NR_timerfd_settime 311
#define __NR_timerfd_gettime 312
+#define __NR_clone64 313
+#define __NR_unshare64 314

#ifdef __KERNEL__

-#define __NR_syscalls 313
+#define __NR_syscalls 315

#define __NR__exit __NR_exit
#define NR_syscalls __NR_syscalls
Index: 2.6.25-rc2-mm1/include/asm-s390/unistd.h
===================================================================
--- 2.6.25-rc2-mm1.orig/include/asm-s390/unistd.h 2008-02-27 15:18:13.000000000 -0800
+++ 2.6.25-rc2-mm1/include/asm-s390/unistd.h 2008-03-06 22:08:49.000000000 -0800
@@ -259,7 +259,9 @@
#define __NR_timerfd_create 319
#define __NR_timerfd_settime 320
#define __NR_timerfd_gettime 321
-#define NR_syscalls 322
+#define __NR_clone64 322
+#define __NR_unshare64 323
+#define NR_syscalls 324

/*
* There are some system calls that are not present on 64 bit, some
Index: 2.6.25-rc2-mm1/include/asm-x86/unistd_32.h
===================================================================
--- 2.6.25-rc2-mm1.orig/include/asm-x86/unistd_32.h 2008-02-27 15:18:16.000000000 -0800
+++ 2.6.25-rc2-mm1/include/asm-x86/unistd_32.h 2008-03-06 22:08:49.000000000 -0800
@@ -332,6 +332,8 @@
#define __NR_fallocate 324
#define __NR_timerfd_settime 325
#define __NR_timerfd_gettime 326
+#define __NR_clone64 327
+#define __NR_unshare64 328

#ifdef __KERNEL__

Index: 2.6.25-rc2-mm1/include/asm-x86/unistd_64.h
===================================================================
--- 2.6.25-rc2-mm1.orig/include/asm-x86/unistd_64.h 2008-02-27 15:18:16.000000000 -0800
+++ 2.6.25-rc2-mm1/include/asm-x86/unistd_64.h 2008-03-06 22:08:49.000000000 -0800
@@ -639,6 +639,10 @@ __SYSCALL(__NR_fallocate, sys_fallocate)
__SYSCALL(__NR_timerfd_settime, sys_timerfd_settime)
#define __NR_timerfd_gettime 287
__SYSCALL(__NR_timerfd_gettime, sys_timerfd_gettime)
+#define __NR_clone64 288
+__SYSCALL(__NR_clone64, stub_clone64)
+#define __NR_unshare64 289
+__SYSCALL(__NR_unshare64, sys_unshare64)


#ifndef __NO_STUBS
Index: 2.6.25-rc2-mm1/include/linux/syscalls.h
===================================================================
--- 2.6.25-rc2-mm1.orig/include/linux/syscalls.h 2008-02-27 15:18:18.000000000 -0800
+++ 2.6.25-rc2-mm1/include/linux/syscalls.h 2008-03-06 22:08:49.000000000 -0800
@@ -615,6 +615,9 @@ asmlinkage long sys_timerfd_gettime(int
asmlinkage long sys_eventfd(unsigned int count);
asmlinkage long sys_fallocate(int fd, int mode, loff_t offset, loff_t len);

+asmlinkage long sys_unshare64(unsigned long clone_flags_high,
+ unsigned long clone_flags_low);
+
int kernel_execve(const char *filename, char *const argv[], char *const envp[]);

#endif
Index: 2.6.25-rc2-mm1/kernel/sys_ni.c
===================================================================
--- 2.6.25-rc2-mm1.orig/kernel/sys_ni.c 2008-02-27 15:18:23.000000000 -0800
+++ 2.6.25-rc2-mm1/kernel/sys_ni.c 2008-03-06 22:08:49.000000000 -0800
@@ -161,3 +161,6 @@ cond_syscall(sys_timerfd_gettime);
cond_syscall(compat_sys_timerfd_settime);
cond_syscall(compat_sys_timerfd_gettime);
cond_syscall(sys_eventfd);
+
+cond_syscall(sys_clone64);
+cond_syscall(sys_unshare64);
Index: 2.6.25-rc2-mm1/arch/x86/kernel/process_32.c
===================================================================
--- 2.6.25-rc2-mm1.orig/arch/x86/kernel/process_32.c 2008-03-06 22:08:49.000000000 -0800
+++ 2.6.25-rc2-mm1/arch/x86/kernel/process_32.c 2008-03-06 22:08:49.000000000 -0800
@@ -771,6 +771,20 @@ asmlinkage int sys_clone(struct pt_regs
return do_fork(clone_flags, newsp, &regs, 0, parent_tidptr, child_tidptr);
}

+asmlinkage int sys_clone64(struct pt_regs regs)
+{
+ u64 clone_flags;
+ unsigned long newsp;
+
+ clone_flags = ((u64) regs.bx << 32 | regs.cx);
+ clone_flags &= ~(CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID);
+
+ newsp = regs.dx;
+ if (!newsp)
+ newsp = regs.sp;
+ return do_fork(clone_flags, newsp, &regs, 0, NULL, NULL);
+}
+
/*
* This is trivial, and on the face of it looks like it
* could equally well be done in user mode.
Index: 2.6.25-rc2-mm1/arch/x86/kernel/process_64.c
===================================================================
--- 2.6.25-rc2-mm1.orig/arch/x86/kernel/process_64.c 2008-03-06 22:08:49.000000000 -0800
+++ 2.6.25-rc2-mm1/arch/x86/kernel/process_64.c 2008-03-06 22:08:49.000000000 -0800
@@ -775,6 +775,21 @@ sys_clone(unsigned long clone_flags, uns
return do_fork(clone_flags, newsp, regs, 0, parent_tid, child_tid);
}

+asmlinkage long
+sys_clone64(unsigned long clone_flags_high, unsigned long clone_flags_low,
+ unsigned long newsp, struct pt_regs *regs)
+{
+ u64 clone_flags;
+
+ clone_flags = ((u64) clone_flags_high << 32 | clone_flags_low);
+ clone_flags &= ~(CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID);
+
+ if (!newsp)
+ newsp = regs->sp;
+ return do_fork(clone_flags, newsp, regs, 0, NULL, NULL);
+}
+
+
/*
* This is trivial, and on the face of it looks like it
* could equally well be done in user mode.
Index: 2.6.25-rc2-mm1/arch/s390/kernel/compat_linux.c
===================================================================
--- 2.6.25-rc2-mm1.orig/arch/s390/kernel/compat_linux.c 2008-01-26 09:48:58.000000000 -0800
+++ 2.6.25-rc2-mm1/arch/s390/kernel/compat_linux.c 2008-03-06 22:08:49.000000000 -0800
@@ -940,6 +940,22 @@ asmlinkage long sys32_clone(void)
parent_tidptr, child_tidptr);
}

+asmlinkage long sys32_clone64(void)
+{
+ struct pt_regs *regs = task_pt_regs(current);
+ u64 clone_flags;
+ unsigned long newsp;
+
+ clone_flags = ((u64) (regs->orig_gpr2 & 0xffffffffUL) << 32 |
+ (regs->gprs[3] & 0xffffffffUL));
+ clone_flags &= ~(CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID);
+
+ newsp = regs->gprs[4] & 0x7fffffffUL;
+ if (!newsp)
+ newsp = regs->gprs[15];
+ return do_fork(clone_flags, newsp, regs, 0, NULL, NULL);
+}
+
/*
* 31 bit emulation wrapper functions for sys_fadvise64/fadvise64_64.
* These need to rewrite the advise values for POSIX_FADV_{DONTNEED,NOREUSE}
Index: 2.6.25-rc2-mm1/arch/s390/kernel/process.c
===================================================================
--- 2.6.25-rc2-mm1.orig/arch/s390/kernel/process.c 2008-03-06 22:08:49.000000000 -0800
+++ 2.6.25-rc2-mm1/arch/s390/kernel/process.c 2008-03-06 22:08:49.000000000 -0800
@@ -325,6 +325,21 @@ asmlinkage long sys_clone(void)
parent_tidptr, child_tidptr);
}

+asmlinkage long sys_clone64(void)
+{
+ struct pt_regs *regs = task_pt_regs(current);
+ u64 clone_flags;
+ unsigned long newsp;
+
+ clone_flags = ((u64) regs->orig_gpr2 << 32 | regs->gprs[3]);
+ clone_flags &= ~(CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID);
+
+ newsp = regs->gprs[4];
+ if (!newsp)
+ newsp = regs->gprs[15];
+ return do_fork(clone_flags, newsp, regs, 0, NULL, NULL);
+}
+
/*
* This is trivial, and on the face of it looks like it
* could equally well be done in user mode.
Index: 2.6.25-rc2-mm1/arch/powerpc/kernel/process.c
===================================================================
--- 2.6.25-rc2-mm1.orig/arch/powerpc/kernel/process.c 2008-03-06 22:08:49.000000000 -0800
+++ 2.6.25-rc2-mm1/arch/powerpc/kernel/process.c 2008-03-06 22:08:49.000000000 -0800
@@ -829,6 +829,21 @@ int sys_clone(unsigned long clone_flags,
return do_fork(clone_flags, usp, regs, 0, parent_tidp, child_tidp);
}

+int sys_clone64(unsigned long clone_flags_high, unsigned long clone_flags_low,
+ unsigned long usp, unsigned long p4, unsigned long p5,
+ unsigned long p6, struct pt_regs *regs)
+{
+ u64 clone_flags;
+
+ clone_flags = ((u64) clone_flags_high << 32 | clone_flags_low);
+ clone_flags &= ~(CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID);
+
+ CHECK_FULL_REGS(regs);
+ if (usp == 0)
+ usp = regs->gpr[1]; /* stack pointer for child */
+ return do_fork(clone_flags, usp, regs, 0, NULL, NULL);
+}
+
int sys_fork(unsigned long p1, unsigned long p2, unsigned long p3,
unsigned long p4, unsigned long p5, unsigned long p6,
struct pt_regs *regs)
Index: 2.6.25-rc2-mm1/arch/x86/kernel/entry_64.S
===================================================================
--- 2.6.25-rc2-mm1.orig/arch/x86/kernel/entry_64.S 2008-02-27 16:07:43.000000000 -0800
+++ 2.6.25-rc2-mm1/arch/x86/kernel/entry_64.S 2008-03-06 22:08:49.000000000 -0800
@@ -527,6 +527,7 @@ END(\label)
PTREGSCALL stub_rt_sigsuspend, sys_rt_sigsuspend, %rdx
PTREGSCALL stub_sigaltstack, sys_sigaltstack, %rdx
PTREGSCALL stub_iopl, sys_iopl, %rsi
+ PTREGSCALL stub_clone64, sys_clone64, %rcx

ENTRY(ptregscall_common)
popq %r11
Index: 2.6.25-rc2-mm1/arch/powerpc/kernel/entry_32.S
===================================================================
--- 2.6.25-rc2-mm1.orig/arch/powerpc/kernel/entry_32.S 2008-01-26 09:48:57.000000000 -0800
+++ 2.6.25-rc2-mm1/arch/powerpc/kernel/entry_32.S 2008-03-06 22:08:49.000000000 -0800
@@ -452,6 +452,14 @@ ppc_clone:
stw r0,_TRAP(r1) /* register set saved */
b sys_clone

+ .globl ppc_clone64
+ppc_clone64:
+ SAVE_NVGPRS(r1)
+ lwz r0,_TRAP(r1)
+ rlwinm r0,r0,0,0,30 /* clear LSB to indicate full */
+ stw r0,_TRAP(r1) /* register set saved */
+ b sys_clone64
+
.globl ppc_swapcontext
ppc_swapcontext:
SAVE_NVGPRS(r1)
Index: 2.6.25-rc2-mm1/arch/powerpc/kernel/entry_64.S
===================================================================
--- 2.6.25-rc2-mm1.orig/arch/powerpc/kernel/entry_64.S 2008-01-26 09:48:57.000000000 -0800
+++ 2.6.25-rc2-mm1/arch/powerpc/kernel/entry_64.S 2008-03-06 22:08:49.000000000 -0800
@@ -298,6 +298,11 @@ _GLOBAL(ppc_clone)
bl .sys_clone
b syscall_exit

+_GLOBAL(ppc_clone64)
+ bl .save_nvgprs
+ bl .sys_clone64
+ b syscall_exit
+
_GLOBAL(ppc32_swapcontext)
bl .save_nvgprs
bl .compat_sys_swapcontext
Index: 2.6.25-rc2-mm1/arch/s390/kernel/compat_wrapper.S
===================================================================
--- 2.6.25-rc2-mm1.orig/arch/s390/kernel/compat_wrapper.S 2008-02-27 15:17:33.000000000 -0800
+++ 2.6.25-rc2-mm1/arch/s390/kernel/compat_wrapper.S 2008-03-06 22:08:49.000000000 -0800
@@ -1732,3 +1732,9 @@ compat_sys_timerfd_gettime_wrapper:
lgfr %r2,%r2 # int
llgtr %r3,%r3 # struct compat_itimerspec *
jg compat_sys_timerfd_gettime
+
+ .globl sys_unshare64_wrapper
+sys_unshare64_wrapper:
+ llgfr %r2,%r2 # unsigned long
+ llgfr %r3,%r3 # unsigned long
+ jg sys_unshare64
Index: 2.6.25-rc2-mm1/kernel/fork.c
===================================================================
--- 2.6.25-rc2-mm1.orig/kernel/fork.c 2008-03-06 22:08:49.000000000 -0800
+++ 2.6.25-rc2-mm1/kernel/fork.c 2008-03-10 20:47:10.000000000 -0700
@@ -1795,3 +1795,10 @@ asmlinkage long sys_unshare(unsigned lon
{
return do_unshare(unshare_flags);
}
+
+asmlinkage long sys_unshare64(unsigned long flags_high, unsigned long flags_low)
+{
+ u64 unshare_flags = ((u64) flags_high << 32 | flags_low);
+
+ return do_unshare(unshare_flags);
+}
Index: 2.6.25-rc2-mm1/arch/x86/ia32/sys_ia32.c
===================================================================
--- 2.6.25-rc2-mm1.orig/arch/x86/ia32/sys_ia32.c 2008-02-27 15:17:35.000000000 -0800
+++ 2.6.25-rc2-mm1/arch/x86/ia32/sys_ia32.c 2008-03-06 22:08:49.000000000 -0800
@@ -824,6 +824,18 @@ asmlinkage long sys32_clone(unsigned int
return do_fork(clone_flags, newsp, regs, 0, parent_tid, child_tid);
}

+asmlinkage long sys32_clone64(unsigned int flags_high, unsigned int flags_low,
+ unsigned int newsp, struct pt_regs *regs)
+{
+ u64 clone_flags = ((u64) flags_high << 32 | flags_low);
+
+ clone_flags &= ~(CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID);
+
+ if (!newsp)
+ newsp = regs->sp;
+ return do_fork(clone_flags, newsp, regs, 0, NULL, NULL);
+}
+
/*
* Some system calls that need sign extended arguments. This could be
* done by a generic wrapper.
Index: 2.6.25-rc2-mm1/arch/x86/ia32/ia32entry.S
===================================================================
--- 2.6.25-rc2-mm1.orig/arch/x86/ia32/ia32entry.S 2008-02-27 15:17:35.000000000 -0800
+++ 2.6.25-rc2-mm1/arch/x86/ia32/ia32entry.S 2008-03-06 22:08:49.000000000 -0800
@@ -373,6 +373,7 @@ quiet_ni_syscall:
PTREGSCALL stub32_vfork, sys_vfork, %rdi
PTREGSCALL stub32_iopl, sys_iopl, %rsi
PTREGSCALL stub32_rt_sigsuspend, sys_rt_sigsuspend, %rdx
+ PTREGSCALL stub32_clone64, sys32_clone64, %rcx

ENTRY(ia32_ptregs_common)
popq %r11
@@ -727,4 +728,7 @@ ia32_sys_call_table:
.quad sys32_fallocate
.quad compat_sys_timerfd_settime /* 325 */
.quad compat_sys_timerfd_gettime
+ .quad stub32_clone64
+ .quad sys_unshare64
+
ia32_syscall_end:
--
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