meta-aspeed: Enable hardened allocator feature
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.
Change-Id: I3c3ce67bc202dffbc3084382227f3dbc77f4cf85
Signed-off-by: Joel Stanley <joel@jms.id.au>
diff --git a/meta-aspeed/recipes-kernel/linux/linux-aspeed/aspeed-g4/defconfig b/meta-aspeed/recipes-kernel/linux/linux-aspeed/aspeed-g4/defconfig
index d128c7a..6a2c6d9 100644
--- a/meta-aspeed/recipes-kernel/linux/linux-aspeed/aspeed-g4/defconfig
+++ b/meta-aspeed/recipes-kernel/linux/linux-aspeed/aspeed-g4/defconfig
@@ -21,8 +21,8 @@
CONFIG_EMBEDDED=y
CONFIG_PERF_EVENTS=y
# CONFIG_COMPAT_BRK is not set
-CONFIG_SLAB=y
CONFIG_SLAB_FREELIST_RANDOM=y
+CONFIG_SLAB_FREELIST_HARDENED=y
# CONFIG_ARCH_MULTI_V7 is not set
CONFIG_ARCH_ASPEED=y
CONFIG_MACH_ASPEED_G4=y