[PATCH] namespaces: utsname: switch to using uts namespaces

Replace references to system_utsname to the per-process uts namespace
where appropriate.  This includes things like uname.

Changes: Per Eric Biederman's comments, use the per-process uts namespace
	for ELF_PLATFORM, sunrpc, and parts of net/ipv4/ipconfig.c

[jdike@addtoit.com: UML fix]
[clg@fr.ibm.com: cleanup]
[akpm@osdl.org: build fix]
Signed-off-by: Serge E. Hallyn <serue@us.ibm.com>
Cc: Kirill Korotaev <dev@openvz.org>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Herbert Poetzl <herbert@13thfloor.at>
Cc: Andrey Savochkin <saw@sw.ru>
Signed-off-by: Cedric Le Goater <clg@fr.ibm.com>
Cc: Jeff Dike <jdike@addtoit.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

3 files changed, 23 insertions, 18 deletions

diff --git a/arch/mips/kernel/linux32.c b/arch/mips/kernel/linux32.c
index 43b1162d714f..52cada45b353 100644
--- a/arch/mips/kernel/linux32.c
+++ b/arch/mips/kernel/linux32.c
@@ -1039,7 +1039,7 @@ asmlinkage long sys32_newuname(struct new_utsname __user * name)
         int ret = 0;
 
         down_read(&uts_sem);
-        if (copy_to_user(name,&system_utsname,sizeof *name))
+        if (copy_to_user(name, utsname(), sizeof *name))
                 ret = -EFAULT;
         up_read(&uts_sem);
 
diff --git a/arch/mips/kernel/syscall.c b/arch/mips/kernel/syscall.c
index 9951240cc3fd..970e3e96b1d0 100644
--- a/arch/mips/kernel/syscall.c
+++ b/arch/mips/kernel/syscall.c
@@ -231,7 +231,7 @@ out:
  */
 asmlinkage int sys_uname(struct old_utsname __user * name)
 {
-        if (name && !copy_to_user(name, &system_utsname, sizeof (*name)))
+        if (name && !copy_to_user(name, utsname(), sizeof (*name)))
                 return 0;
         return -EFAULT;
 }
@@ -248,16 +248,21 @@ asmlinkage int sys_olduname(struct oldold_utsname __user * name)
         if (!access_ok(VERIFY_WRITE,name,sizeof(struct oldold_utsname)))
                 return -EFAULT;
 
-        error = __copy_to_user(&name->sysname,&system_utsname.sysname,__OLD_UTS_LEN);
-        error -= __put_user(0,name->sysname+__OLD_UTS_LEN);
-        error -= __copy_to_user(&name->nodename,&system_utsname.nodename,__OLD_UTS_LEN);
-        error -= __put_user(0,name->nodename+__OLD_UTS_LEN);
-        error -= __copy_to_user(&name->release,&system_utsname.release,__OLD_UTS_LEN);
-        error -= __put_user(0,name->release+__OLD_UTS_LEN);
-        error -= __copy_to_user(&name->version,&system_utsname.version,__OLD_UTS_LEN);
-        error -= __put_user(0,name->version+__OLD_UTS_LEN);
-        error -= __copy_to_user(&name->machine,&system_utsname.machine,__OLD_UTS_LEN);
-        error = __put_user(0,name->machine+__OLD_UTS_LEN);
+        error = __copy_to_user(&name->sysname, &utsname()->sysname,
+                               __OLD_UTS_LEN);
+        error -= __put_user(0, name->sysname + __OLD_UTS_LEN);
+        error -= __copy_to_user(&name->nodename, &utsname()->nodename,
+                                __OLD_UTS_LEN);
+        error -= __put_user(0, name->nodename + __OLD_UTS_LEN);
+        error -= __copy_to_user(&name->release, &utsname()->release,
+                                __OLD_UTS_LEN);
+        error -= __put_user(0, name->release + __OLD_UTS_LEN);
+        error -= __copy_to_user(&name->version, &utsname()->version,
+                                __OLD_UTS_LEN);
+        error -= __put_user(0, name->version + __OLD_UTS_LEN);
+        error -= __copy_to_user(&name->machine, &utsname()->machine,
+                                __OLD_UTS_LEN);
+        error = __put_user(0, name->machine + __OLD_UTS_LEN);
         error = error ? -EFAULT : 0;
 
         return error;
diff --git a/arch/mips/kernel/sysirix.c b/arch/mips/kernel/sysirix.c
index 1137dd6ea7aa..11bb97174972 100644
--- a/arch/mips/kernel/sysirix.c
+++ b/arch/mips/kernel/sysirix.c
@@ -884,7 +884,7 @@ asmlinkage int irix_getdomainname(char __user *name, int len)
         down_read(&uts_sem);
         if (len > __NEW_UTS_LEN)
                 len = __NEW_UTS_LEN;
-        err = copy_to_user(name, system_utsname.domainname, len) ? -EFAULT : 0;
+        err = copy_to_user(name, utsname()->domainname, len) ? -EFAULT : 0;
         up_read(&uts_sem);
 
         return err;
@@ -1127,11 +1127,11 @@ struct iuname {
 asmlinkage int irix_uname(struct iuname __user *buf)
 {
         down_read(&uts_sem);
-        if (copy_from_user(system_utsname.sysname, buf->sysname, 65)
-            || copy_from_user(system_utsname.nodename, buf->nodename, 65)
-            || copy_from_user(system_utsname.release, buf->release, 65)
-            || copy_from_user(system_utsname.version, buf->version, 65)
-            || copy_from_user(system_utsname.machine, buf->machine, 65)) {
+        if (copy_from_user(utsname()->sysname, buf->sysname, 65)
+            || copy_from_user(utsname()->nodename, buf->nodename, 65)
+            || copy_from_user(utsname()->release, buf->release, 65)
+            || copy_from_user(utsname()->version, buf->version, 65)
+            || copy_from_user(utsname()->machine, buf->machine, 65)) {
                 return -EFAULT;
         }
         up_read(&uts_sem);