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SLAB_FREELIST_HARDENED can protect from freelist overwrite attacks with
really small overhead.
It works best with the SLUB allocator, so make SLUB the default by
removing SLAB=y.
total used free shared buff/cache available
SLAB 425596 44065.3+/-220 311099+/-3800 14864+/-3900 70432+/-3700 352767+/-3900
SLUB 425592 44225.3+/-280 313275+/-600 12132+/-3.3 68092+/-530 355295+/-280
These figures are the average memory usage from three boots of each
option in qemu, running the Romulus userspace. The output is from
free(1), reported in kilobytes.
Signed-off-by: Joel Stanley <joel@jms.id.au>
Reviewed-by: Andrew Jeffery <andrew@aj.id.au>
Link: https://lore.kernel.org/r/20210819065203.2620911-2-joel@jms.id.au
Signed-off-by: Joel Stanley <joel@jms.id.au>
66a68b0be4