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| author | Michael Ellerman <mpe@ellerman.id.au> | 2020-01-21 05:29:59 +0100 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2020-01-31 11:20:35 +0100 |
| commit | 5e84dd547bce965c203cae71418cacb8592a0d3f (patch) | |
| tree | 78c05b89a6aaa7ffc17a53746d0fcffeb3248401 /arch/powerpc | |
| parent | powerpc/configs/skiroot: Disable xmon default & enable reboot on panic (diff) | |
| download | linux-5e84dd547bce965c203cae71418cacb8592a0d3f.tar.xz linux-5e84dd547bce965c203cae71418cacb8592a0d3f.zip | |
powerpc/configs/skiroot: Enable some more hardening options
Enable more hardening options.
Note BUG_ON_DATA_CORRUPTION selects DEBUG_LIST and is essentially just
a synonym for it.
DEBUG_SG, DEBUG_NOTIFIERS, DEBUG_LIST, DEBUG_CREDENTIALS and
SCHED_STACK_END_CHECK should all be low overhead and just add a few
extra checks.
SLAB_FREELIST_RANDOM, and SLUB_DEBUG_ON will add some overhead to the
SLAB allocator, but nothing that should be meaningful for skiroot.
Unselecting SLAB_MERGE_DEFAULT causes the SLAB to use more memory, but
the skiroot kernel shouldn't be memory constrained on any of our
systems, all it does is run a small bootloader.
Disabling merging has some security/robustness benefit as it means a
user-after-free or overflow will be limited to the objects in that
slab, rather than potentially affecting objects from unrelated slabs
that have been merged.
Note also that slab merging is disabled anyway by enabling
SLUB_DEBUG_ON, because of the SLAB_NEVER_MERGE mask.
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Acked-by: Joel Stanley <joel@jms.id.au>
Link: https://lore.kernel.org/r/20200121043000.16212-9-mpe@ellerman.id.au
Diffstat (limited to 'arch/powerpc')
| -rw-r--r-- | arch/powerpc/configs/skiroot_defconfig | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/arch/powerpc/configs/skiroot_defconfig b/arch/powerpc/configs/skiroot_defconfig index b05769d05fd6..1b6bdad36b13 100644 --- a/arch/powerpc/configs/skiroot_defconfig +++ b/arch/powerpc/configs/skiroot_defconfig @@ -23,6 +23,8 @@ CONFIG_EXPERT=y # CONFIG_AIO is not set CONFIG_PERF_EVENTS=y # CONFIG_COMPAT_BRK is not set +# CONFIG_SLAB_MERGE_DEFAULT is not set +CONFIG_SLAB_FREELIST_RANDOM=y CONFIG_SLAB_FREELIST_HARDENED=y CONFIG_PPC64=y CONFIG_ALTIVEC=y @@ -294,6 +296,8 @@ CONFIG_LIBCRC32C=y # CONFIG_XZ_DEC_SPARC is not set CONFIG_PRINTK_TIME=y CONFIG_MAGIC_SYSRQ=y +CONFIG_SLUB_DEBUG_ON=y +CONFIG_SCHED_STACK_END_CHECK=y CONFIG_DEBUG_STACKOVERFLOW=y CONFIG_PANIC_ON_OOPS=y CONFIG_SOFTLOCKUP_DETECTOR=y @@ -302,6 +306,10 @@ CONFIG_HARDLOCKUP_DETECTOR=y CONFIG_BOOTPARAM_HARDLOCKUP_PANIC=y CONFIG_WQ_WATCHDOG=y # CONFIG_SCHED_DEBUG is not set +CONFIG_DEBUG_SG=y +CONFIG_DEBUG_NOTIFIERS=y +CONFIG_BUG_ON_DATA_CORRUPTION=y +CONFIG_DEBUG_CREDENTIALS=y # CONFIG_FTRACE is not set CONFIG_XMON=y # CONFIG_RUNTIME_TESTING_MENU is not set |