The kernel may merge similar slabs together to reduce overhead and increase
cache hotness of objects.
Disabling merging of slabs keeps the slabs separate and reduces the risk of
kernel heap overflows overwriting objects in merged caches.
To disable merging of slabs in the Kernel add the argument slab_nomerge=yes
to the default GRUB 2 command line for the Linux operating system.
To ensure that slab_nomerge=yes is added as a kernel command line
argument to newly installed kernels, add slab_nomerge=yes to the
default Grub2 command line for Linux operating systems. Modify the line within
/etc/default/grub as shown below:
GRUB_CMDLINE_LINUX="... slab_nomerge=yes ..."
Run the following command to update command line for already installed kernels:# grubby --update-kernel=ALL --args="slab_nomerge=yes"