4fbfeb8bd6
During usercopy the destination buffer will be zeroed if copy_from_user() or get_user() fails. This patch adds testcases for it. The destination buffer is set with non-zero value before illegal copy_from_user() or get_user() is executed and the buffer is compared to zero after usercopy is done. Signed-off-by: Hoeun Ryu <hoeun.ryu@gmail.com> [kees: clarified commit log, dropped second kmalloc] Signed-off-by: Kees Cook <keescook@chromium.org>
Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. Please read the Documentation/process/changes.rst file, as it contains the requirements for building and running the kernel, and information about the problems which may result by upgrading your kernel.