[PATCH -mm 4/7] add execns syscall to i386

Cedric Le Goater
2006-07-11T07:55:56Z

[-- Attachment #1: execns-syscall-i386.patch --]
[-- Type: text/plain, Size: 2542 bytes --]

This patch adds the execns() syscall to the i386 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/i386/kernel/process.c | 31 +++++++++++++++++++++++++++++++
arch/i386/kernel/syscall_table.S | 1 +
include/asm-i386/unistd.h | 3 ++-
3 files changed, 34 insertions(+), 1 deletion(-)

Index: 2.6.18-rc1-mm1/arch/i386/kernel/process.c
===================================================================
--- 2.6.18-rc1-mm1.orig/arch/i386/kernel/process.c
+++ 2.6.18-rc1-mm1/arch/i386/kernel/process.c
@@ -768,6 +768,37 @@ out:
return error;
}

+/*
+ * sys_execns() executes a new program and unshares selected
+ * namespaces.
+ */
+asmlinkage int sys_execns(struct pt_regs regs)
+{
+ int error;
+ int flags;
+ char * filename;
+
+ flags = regs.ebx;
+ filename = getname((char __user *) regs.ecx);
+ error = PTR_ERR(filename);
+ if (IS_ERR(filename))
+ goto out;
+ error = do_execns(flags, filename,
+ (char __user * __user *) regs.edx,
+ (char __user * __user *) regs.edi,
+ &regs);
+ if (error == 0) {
+ task_lock(current);
+ current->ptrace &= ~PT_DTRACE;
+ task_unlock(current);
+ /* Make sure we don't return using sysenter.. */
+ set_thread_flag(TIF_IRET);
+ }
+ putname(filename);
+out:
+ return error;
+}
+
#define top_esp (THREAD_SIZE - sizeof(unsigned long))
#define top_ebp (THREAD_SIZE - 2*sizeof(unsigned long))

Index: 2.6.18-rc1-mm1/arch/i386/kernel/syscall_table.S
===================================================================
--- 2.6.18-rc1-mm1.orig/arch/i386/kernel/syscall_table.S
+++ 2.6.18-rc1-mm1/arch/i386/kernel/syscall_table.S
@@ -317,3 +317,4 @@ ENTRY(sys_call_table)
.long sys_tee /* 315 */
.long sys_vmsplice
.long sys_move_pages
+ .long sys_execns
Index: 2.6.18-rc1-mm1/include/asm-i386/unistd.h
===================================================================
--- 2.6.18-rc1-mm1.orig/include/asm-i386/unistd.h
+++ 2.6.18-rc1-mm1/include/asm-i386/unistd.h
@@ -323,10 +323,11 @@
#define __NR_tee 315
#define __NR_vmsplice 316
#define __NR_move_pages 317
+#define __NR_execns 318

#ifdef __KERNEL__

-#define NR_syscalls 318
+#define NR_syscalls 319
#include <linux/err.h>

/*

--