apfs/linux-apfs
0
0
Fork 0
mirror of https://github.com/linux-apfs/linux-apfs.git synced 2026-05-01 15:00:59 -07:00
Code Issues Packages Projects Releases Wiki Activity

userns: Implement unshare of the user namespace

Browse Source 
- Add CLONE_THREAD to the unshare flags if CLONE_NEWUSER is selected
  As changing user namespaces is only valid if all there is only
  a single thread.
- Restore the code to add CLONE_VM if CLONE_THREAD is selected and
  the code to addCLONE_SIGHAND if CLONE_VM is selected.
  Making the constraints in the code clear.

Acked-by: Serge Hallyn <serge.hallyn@canonical.com>
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
This commit is contained in:
Eric W. Biederman
2012-07-26 05:15:35 -07:00
parent cde1975bc2
commit b2e0d98705
5 changed files with 51 additions and 8 deletions
Download Patch File Download Diff File Expand all files Collapse all files
kernel/user_namespace.c
+15
View File
@@ -82,6 +82,21 @@ int create_user_ns(struct cred *new)
return 0;
}
int unshare_userns(unsigned long unshare_flags, struct cred **new_cred)
{
struct cred *cred;
if (!(unshare_flags & CLONE_NEWUSER))
return 0;
cred = prepare_creds();
if (!cred)
return -ENOMEM;
*new_cred = cred;
return create_user_ns(cred);
}
void free_user_ns(struct kref *kref)
{
struct user_namespace *parent, *ns =