user namespace: fix copy_user_ns return value

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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>

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Serge E. Hallyn 2007-07-17 15:28:17 -04:00 • committed by Linus Torvalds

parent 9550b105b8

commit 626ac545c1

1 changed files with 1 additions and 1 deletions

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include/linux/user_namespace.h

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