The code used in the header was taken from linux kernel commit
f0907827a8a9152aedac2833ed1b674a7b2a44f2. Rasmus Villemoes
<linux@rasmusvillemoes.dk>, the original author of the patch, was
contacted directly, confirmed his authorship of the code, and gave his
permission on treating that dual license as MIT and including into GRUB2
sources
Signed-off-by: Alex Burmashev <alexander.burmashev@oracle.com>
Patch-Name: safe-alloc-5.patch
This adds a new header, include/grub/safemath.h, that includes easy to
use wrappers for __builtin_{add,sub,mul}_overflow() declared like:
bool OP(a, b, res)
where OP is grub_add, grub_sub or grub_mul. OP() returns true in the
case where the operation would overflow and res is not modified.
Otherwise, false is returned and the operation is executed.
These arithmetic primitives require newer compiler versions. So, bump
these requirements in the INSTALL file too.
Signed-off-by: Peter Jones <pjones@redhat.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
Patch-Name: safe-alloc-1.patch
