2a330dba93
Fuzzing found the following crash: search -hhhhhhhhhhhhhf We didn't allocate enough option space for 13 hints because the allocation code counts the number of discrete arguments (i.e. argc). However, the shortopt parsing code will happily keep processing a combination of short options without checking if those short options require an argument. This means you can easily end writing past the allocated option space. This fixes a OOB write which can cause heap corruption. Fixes: CVE-2021-20225 Reported-by: Daniel Axtens <dja@axtens.net> Signed-off-by: Daniel Axtens <dja@axtens.net> 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. 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'