Finer-grained kernel address-space layout randomization
Finer-grained kernel address-space layout randomization
[Kernel] Posted Feb 19, 2020 13:45 UTC (Wed) by jake
The idea behind kernel address-space layout randomization (KASLR) is to make it harder for attackers to find code and data of interest to use in their attacks by loading the kernel at a random location. But a single random offset is used for the placement of the kernel text, which presents a weakness: if the offset can be determined for anything within the kernel, the addresses of other parts of the kernel are readily calculable. A new "finer-grained" KASLR patch set seeks to remedy that weakness for the text section of the kernel by randomly reordering the functions within the kernel code at boot time.