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Subject[PATCH -mm 3/7] add execns syscall to x86_64
This patch adds the execns() syscall to the x86_64 architecture.

Signed-off-by: Cedric Le Goater <clg@fr.ibm.com>
Cc: Andrew Morton <akpm@osdl.org>
Cc: Kirill Korotaev <dev@openvz.org>
Cc: Andrey Savochkin <saw@sw.ru>
Cc: Eric W. Biederman <ebiederm@xmission.com>
Cc: Herbert Poetzl <herbert@13thfloor.at>
Cc: Sam Vilain <sam.vilain@catalyst.net.nz>
Cc: Serge E. Hallyn <serue@us.ibm.com>
Cc: Dave Hansen <haveblue@us.ibm.com>

---
arch/x86_64/kernel/entry.S | 30 ++++++++++++++++++++++++++++++
arch/x86_64/kernel/functionlist | 3 +++
arch/x86_64/kernel/process.c | 25 +++++++++++++++++++++++++
include/asm-x86_64/unistd.h | 4 +++-
4 files changed, 61 insertions(+), 1 deletion(-)
Index: 2.6.18-rc1-mm1/arch/x86_64/kernel/entry.S
===================================================================
--- 2.6.18-rc1-mm1.orig/arch/x86_64/kernel/entry.S
+++ 2.6.18-rc1-mm1/arch/x86_64/kernel/entry.S
@@ -453,6 +453,21 @@ ENTRY(stub_execve)
CFI_ENDPROC
END(stub_execve)

+ENTRY(stub_execns)
+ CFI_STARTPROC
+ popq %r11
+ CFI_ADJUST_CFA_OFFSET -8
+ CFI_REGISTER rip, r11
+ SAVE_REST
+ FIXUP_TOP_OF_STACK %r11
+ call sys_execns
+ RESTORE_TOP_OF_STACK %r11
+ movq %rax,RAX(%rsp)
+ RESTORE_REST
+ jmp int_ret_from_sys_call
+ CFI_ENDPROC
+END(stub_execns)
+
/*
* sigreturn is special because it needs to restore all registers on return.
* This cannot be done with SYSRET, so use the IRET return path instead.
@@ -1014,6 +1029,21 @@ ENTRY(execve)
CFI_ENDPROC
ENDPROC(execve)

+ENTRY(execns)
+ CFI_STARTPROC
+ FAKE_STACK_FRAME $0
+ SAVE_ALL
+ call sys_execns
+ movq %rax, RAX(%rsp)
+ RESTORE_REST
+ testq %rax,%rax
+ je int_ret_from_sys_call
+ RESTORE_ARGS
+ UNFAKE_STACK_FRAME
+ ret
+ CFI_ENDPROC
+ENDPROC(execns)
+
KPROBE_ENTRY(page_fault)
errorentry do_page_fault
END(page_fault)
Index: 2.6.18-rc1-mm1/arch/x86_64/kernel/functionlist
===================================================================
--- 2.6.18-rc1-mm1.orig/arch/x86_64/kernel/functionlist
+++ 2.6.18-rc1-mm1/arch/x86_64/kernel/functionlist
@@ -551,6 +551,7 @@
*(.text.sys_getdents)
*(.text.sys_dup)
*(.text.stub_execve)
+*(.text.stub_execns)
*(.text.sha_transform)
*(.text.radix_tree_tag_clear)
*(.text.put_unused_fd)
@@ -678,6 +679,7 @@
*(.text.__find_symbol)
*(.text.do_futex)
*(.text.do_execve)
+*(.text.do_execns)
*(.text.dirty_writeback_centisecs_handler)
*(.text.dev_watchdog)
*(.text.can_share_swap_page)
@@ -1098,6 +1100,7 @@
*(.text.sys_fstat)
*(.text.sysfs_readdir)
*(.text.sys_execve)
+*(.text.sys_execns)
*(.text.sysenter_tracesys)
*(.text.sys_chown)
*(.text.stub_clone)
Index: 2.6.18-rc1-mm1/arch/x86_64/kernel/process.c
===================================================================
--- 2.6.18-rc1-mm1.orig/arch/x86_64/kernel/process.c
+++ 2.6.18-rc1-mm1/arch/x86_64/kernel/process.c
@@ -697,6 +697,31 @@ long sys_execve(char __user *name, char
return error;
}

+/*
+ * sys_execns() executes a new program and unshares selected
+ * namespaces.
+ */
+asmlinkage
+long sys_execns(int flags, char __user *name, char __user * __user *argv,
+ char __user * __user *envp, struct pt_regs regs)
+{
+ long error;
+ char * filename;
+
+ filename = getname(name);
+ error = PTR_ERR(filename);
+ if (IS_ERR(filename))
+ return error;
+ error = do_execns(flags, filename, argv, envp, &regs);
+ if (error == 0) {
+ task_lock(current);
+ current->ptrace &= ~PT_DTRACE;
+ task_unlock(current);
+ }
+ putname(filename);
+ return error;
+}
+
void set_personality_64bit(void)
{
/* inherit personality from parent */
Index: 2.6.18-rc1-mm1/include/asm-x86_64/unistd.h
===================================================================
--- 2.6.18-rc1-mm1.orig/include/asm-x86_64/unistd.h
+++ 2.6.18-rc1-mm1/include/asm-x86_64/unistd.h
@@ -619,10 +619,12 @@ __SYSCALL(__NR_sync_file_range, sys_sync
__SYSCALL(__NR_vmsplice, sys_vmsplice)
#define __NR_move_pages 279
__SYSCALL(__NR_move_pages, sys_move_pages)
+#define __NR_execns 280
+__SYSCALL(__NR_execns, stub_execns)

#ifdef __KERNEL__

-#define __NR_syscall_max __NR_move_pages
+#define __NR_syscall_max __NR_execns
#include <linux/err.h>

#ifndef __NO_STUBS
--
-
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