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| author | Serge E. Hallyn | 2007-07-17 21:28:17 +0200 |
|---|---|---|
| committer | Linus Torvalds | 2007-07-19 23:05:08 +0200 |
| commit | 626ac545c12e5f9bffe93086d1d03d26c99987ea (patch) | |
| tree | 3ff83cc510f09bd0561b3b2a8b769beda952ad17 /include | |
| parent | slub: fix ksize() for zero-sized pointers (diff) | |
| download | kernel-qcow2-linux-626ac545c12e5f9bffe93086d1d03d26c99987ea.tar.gz kernel-qcow2-linux-626ac545c12e5f9bffe93086d1d03d26c99987ea.tar.xz kernel-qcow2-linux-626ac545c12e5f9bffe93086d1d03d26c99987ea.zip | |
user namespace: fix copy_user_ns return value
When a CONFIG_USER_NS=n and a user tries to unshare some namespace other
than the user namespace, the dummy copy_user_ns returns NULL rather than
the old_ns.
This value then gets assigned to task->nsproxy->user_ns, so that a
subsequent setuid, which uses task->nsproxy->user_ns, causes a NULL
pointer deref.
Fix this by returning old_ns.
Signed-off-by: Serge E. Hallyn <serue@us.ibm.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/user_namespace.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/include/linux/user_namespace.h b/include/linux/user_namespace.h index bb320573bb9e..1101b0ce878f 100644 --- a/include/linux/user_namespace.h +++ b/include/linux/user_namespace.h @@ -49,7 +49,7 @@ static inline struct user_namespace *copy_user_ns(int flags, if (flags & CLONE_NEWUSER) return ERR_PTR(-EINVAL); - return NULL; + return old_ns; } static inline void put_user_ns(struct user_namespace *ns) |