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authorSerge E. Hallyn <serue@us.ibm.com>2006-10-02 02:18:17 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2006-10-02 07:57:22 -0700
commit071df104f808b8195c40643dcb4d060681742e29 (patch)
treee5c3355e526e0182797d59c7e80062fbc2bb7d77 /kernel/fork.c
parentbf47fdcda65b44dbd674eeedcaa06e0aa28a5a00 (diff)
[PATCH] namespaces: utsname: implement CLONE_NEWUTS flag
Implement a CLONE_NEWUTS flag, and use it at clone and sys_unshare. [clg@fr.ibm.com: IPC unshare fix] [bunk@stusta.de: cleanup] Signed-off-by: Serge 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: Adrian Bunk <bunk@stusta.de> Signed-off-by: Cedric Le Goater <clg@fr.ibm.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'kernel/fork.c')
-rw-r--r--kernel/fork.c20
1 files changed, 17 insertions, 3 deletions
diff --git a/kernel/fork.c b/kernel/fork.c
index 33fcf0733ca6..c08cf05dd59b 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -1607,13 +1607,14 @@ asmlinkage long sys_unshare(unsigned long unshare_flags)
struct files_struct *fd, *new_fd = NULL;
struct sem_undo_list *new_ulist = NULL;
struct nsproxy *new_nsproxy, *old_nsproxy;
+ struct uts_namespace *uts, *new_uts = NULL;
check_unshare_flags(&unshare_flags);
/* Return -EINVAL for all unsupported flags */
err = -EINVAL;
if (unshare_flags & ~(CLONE_THREAD|CLONE_FS|CLONE_NEWNS|CLONE_SIGHAND|
- CLONE_VM|CLONE_FILES|CLONE_SYSVSEM))
+ CLONE_VM|CLONE_FILES|CLONE_SYSVSEM|CLONE_NEWUTS))
goto bad_unshare_out;
if ((err = unshare_thread(unshare_flags)))
@@ -1630,14 +1631,17 @@ asmlinkage long sys_unshare(unsigned long unshare_flags)
goto bad_unshare_cleanup_vm;
if ((err = unshare_semundo(unshare_flags, &new_ulist)))
goto bad_unshare_cleanup_fd;
+ if ((err = unshare_utsname(unshare_flags, &new_uts)))
+ goto bad_unshare_cleanup_semundo;
- if (new_fs || new_ns || new_sigh || new_mm || new_fd || new_ulist) {
+ if (new_fs || new_ns || new_sigh || new_mm || new_fd || new_ulist ||
+ new_uts) {
old_nsproxy = current->nsproxy;
new_nsproxy = dup_namespaces(old_nsproxy);
if (!new_nsproxy) {
err = -ENOMEM;
- goto bad_unshare_cleanup_semundo;
+ goto bad_unshare_cleanup_uts;
}
task_lock(current);
@@ -1676,10 +1680,20 @@ asmlinkage long sys_unshare(unsigned long unshare_flags)
new_fd = fd;
}
+ if (new_uts) {
+ uts = current->nsproxy->uts_ns;
+ current->nsproxy->uts_ns = new_uts;
+ new_uts = uts;
+ }
+
task_unlock(current);
put_nsproxy(old_nsproxy);
}
+bad_unshare_cleanup_uts:
+ if (new_uts)
+ put_uts_ns(new_uts);
+
bad_unshare_cleanup_semundo:
bad_unshare_cleanup_fd:
if (new_fd)