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cred: copy_process() should clear child->replacement_session_keyring
keyctl_session_to_parent(task) sets ->replacement_session_keyring, it should be processed and cleared by key_replace_session_keyring(). However, this task can fork before it notices TIF_NOTIFY_RESUME and the new child gets the bogus ->replacement_session_keyring copied by dup_task_struct(). This is obviously wrong and, if nothing else, this leads to put_cred(already_freed_cred). change copy_creds() to clear this member. If copy_process() fails before this point the wrong ->replacement_session_keyring doesn't matter, exit_creds() won't be called. Cc: <email@example.com> Signed-off-by: Oleg Nesterov <firstname.lastname@example.org> Acked-by: David Howells <email@example.com> Signed-off-by: Linus Torvalds <firstname.lastname@example.org>
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