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authorBadari Pulavarty <pbadari@us.ibm.com>2007-05-08 11:25:21 +0400
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-05-08 22:15:00 +0400
commite3222c4ecc649c4ae568e61dda9349482401b501 (patch)
treed96614ef67d947a3dd8ab0929a4755bce9fdbcc1 /kernel/utsname.c
parent4fc75ff4816c3483b4b772b2f6cb3d8fd88ca547 (diff)
downloadlinux-e3222c4ecc649c4ae568e61dda9349482401b501.tar.xz
Merge sys_clone()/sys_unshare() nsproxy and namespace handling
sys_clone() and sys_unshare() both makes copies of nsproxy and its associated namespaces. But they have different code paths. This patch merges all the nsproxy and its associated namespace copy/clone handling (as much as possible). Posted on container list earlier for feedback. - Create a new nsproxy and its associated namespaces and pass it back to caller to attach it to right process. - Changed all copy_*_ns() routines to return a new copy of namespace instead of attaching it to task->nsproxy. - Moved the CAP_SYS_ADMIN checks out of copy_*_ns() routines. - Removed unnessary !ns checks from copy_*_ns() and added BUG_ON() just incase. - Get rid of all individual unshare_*_ns() routines and make use of copy_*_ns() instead. [akpm@osdl.org: cleanups, warning fix] [clg@fr.ibm.com: remove dup_namespaces() declaration] [serue@us.ibm.com: fix CONFIG_IPC_NS=n, clone(CLONE_NEWIPC) retval] [akpm@linux-foundation.org: fix build with CONFIG_SYSVIPC=n] Signed-off-by: Badari Pulavarty <pbadari@us.ibm.com> Signed-off-by: Serge Hallyn <serue@us.ibm.com> Cc: Cedric Le Goater <clg@fr.ibm.com> Cc: "Eric W. Biederman" <ebiederm@xmission.com> Cc: <containers@lists.osdl.org> Signed-off-by: Cedric Le Goater <clg@fr.ibm.com> Cc: Oleg Nesterov <oleg@tv-sign.ru> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel/utsname.c')
-rw-r--r--kernel/utsname.c41
1 files changed, 4 insertions, 37 deletions
diff --git a/kernel/utsname.c b/kernel/utsname.c
index c859164a6993..160c8c5136bd 100644
--- a/kernel/utsname.c
+++ b/kernel/utsname.c
@@ -32,58 +32,25 @@ static struct uts_namespace *clone_uts_ns(struct uts_namespace *old_ns)
}
/*
- * unshare the current process' utsname namespace.
- * called only in sys_unshare()
- */
-int unshare_utsname(unsigned long unshare_flags, struct uts_namespace **new_uts)
-{
- if (unshare_flags & CLONE_NEWUTS) {
- if (!capable(CAP_SYS_ADMIN))
- return -EPERM;
-
- *new_uts = clone_uts_ns(current->nsproxy->uts_ns);
- if (!*new_uts)
- return -ENOMEM;
- }
-
- return 0;
-}
-
-/*
* Copy task tsk's utsname namespace, or clone it if flags
* specifies CLONE_NEWUTS. In latter case, changes to the
* utsname of this process won't be seen by parent, and vice
* versa.
*/
-int copy_utsname(int flags, struct task_struct *tsk)
+struct uts_namespace *copy_utsname(int flags, struct uts_namespace *old_ns)
{
- struct uts_namespace *old_ns = tsk->nsproxy->uts_ns;
struct uts_namespace *new_ns;
- int err = 0;
-
- if (!old_ns)
- return 0;
+ BUG_ON(!old_ns);
get_uts_ns(old_ns);
if (!(flags & CLONE_NEWUTS))
- return 0;
-
- if (!capable(CAP_SYS_ADMIN)) {
- err = -EPERM;
- goto out;
- }
+ return old_ns;
new_ns = clone_uts_ns(old_ns);
- if (!new_ns) {
- err = -ENOMEM;
- goto out;
- }
- tsk->nsproxy->uts_ns = new_ns;
-out:
put_uts_ns(old_ns);
- return err;
+ return new_ns;
}
void free_uts_ns(struct kref *kref)