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ARM: config: aspeed: Enable hardened allocator feature

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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>
This commit is contained in:
Joel Stanley 2021-08-19 16:22:00 +09:30
parent 2734d6c1b1
commit 66a68b0be4
2 changed files with 2 additions and 2 deletions
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2
arch/arm/configs/aspeed_g4_defconfig
View File

@ -18,8 +18,8 @@ CONFIG_BPF_SYSCALL=y
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

2
arch/arm/configs/aspeed_g5_defconfig
View File

@ -18,8 +18,8 @@ CONFIG_BPF_SYSCALL=y
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_V6=y
CONFIG_ARCH_ASPEED=y
CONFIG_MACH_ASPEED_G5=y