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authorSerge E. Hallyn <serue@us.ibm.com>2007-07-17 15:28:17 -0400
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-07-19 14:05:08 -0700
commit626ac545c12e5f9bffe93086d1d03d26c99987ea (patch)
tree3ff83cc510f09bd0561b3b2a8b769beda952ad17 /include/linux/user_namespace.h
parent9550b105b8646f916862aee3ab7b25020ca14159 (diff)
downloadop-kernel-dev-626ac545c12e5f9bffe93086d1d03d26c99987ea.zip
op-kernel-dev-626ac545c12e5f9bffe93086d1d03d26c99987ea.tar.gz
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/linux/user_namespace.h')
-rw-r--r--include/linux/user_namespace.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/include/linux/user_namespace.h b/include/linux/user_namespace.h
index bb32057..1101b0c 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)
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