9c76ec09ae
The length of memory allocation and file read may overflow. This patch fixes the problem by using safemath macros. There is a lot of code repetition like "(x * y + 7) / 8". It is unsafe if overflow happens. This patch introduces grub_video_bitmap_calc_1bpp_bufsz(). It is safe replacement for such code. It has safemath-like prototype. This patch also introduces grub_cast(value, pointer), it casts value to typeof(*pointer) then store the value to *pointer. It returns true when overflow occurs or false if there is no overflow. The semantics of arguments and return value are designed to be consistent with other safemath macros. Signed-off-by: Zhang Boyang <zhangboyang.id@gmail.com> Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
This is GRUB 2, the second version of the GRand Unified Bootloader. GRUB 2 is rewritten from scratch to make GNU GRUB cleaner, safer, more robust, more powerful, and more portable. See the file NEWS for a description of recent changes to GRUB 2. See the file INSTALL for instructions on how to build and install the GRUB 2 data and program files. See the file MAINTAINERS for information about the GRUB maintainers, etc. If you found a security vulnerability in the GRUB please check the SECURITY file to get more information how to properly report this kind of bugs to the maintainers. Please visit the official web page of GRUB 2, for more information. The URL is <http://www.gnu.org/software/grub/grub.html>. More extensive documentation is available in the Info manual, accessible using 'info grub' after building and installing GRUB 2. There are a number of important user-visible differences from the first version of GRUB, now known as GRUB Legacy. For a summary, please see: info grub Introduction 'Changes from GRUB Legacy'