Enable the STACKLEAK GCC plugin which erases the
kernel stack before returning from system calls.
This security options has a reported performance
hit of around 1% which seem like a reasonable amount.
For more details see: https://outflux.net/blog/archives/2018/12/24/security-things-in-linux-v4-20/
Signed-off-by: Rolf Neugebauer <rn@rneugeba.io>
The kernel config was derived from the 4.19.13 kernel config
run through the 'make oldconfig' with all defaults accepted,
except for:
- NET_VENDOR_MICROCHIP (defauly 'y', set to 'n')
Signed-off-by: Rolf Neugebauer <rn@rneugeba.io>
We already have 4.9.x, 4.14.x, and 4,19.x as LTS releases.
4.9.x has a longer lifetime as 4.4.x as well and fewer security
fixes can be backported to 4.4.x. Remove it.
Signed-off-by: Rolf Neugebauer <rn@rneugeba.io>
packet.net will soon have x86 and arm64 machines with NFPs.
Enable the driver for it.
The 4.9 kernel only has support for the NFP VF driver,
so don't enable it there.
Signed-off-by: Rolf Neugebauer <rn@rneugeba.io>
A previosu commit removed suppoer for 4.18.x kernels for
arm64 and s390x but did not remove the config files. Fix it.
Signed-off-by: Rolf Neugebauer <rn@rneugeba.io>
The logic for perf became too complex. Just build for latest LTS
and latest stable.
Disable for arm64 for now as it is broken for 4.19 due to a header
mismatch:
In file included from /linux/tools/arch/arm64/include/uapi/asm/unistd.h:20:0,
from libbpf.c:36:
/linux/tools/include/uapi/asm-generic/unistd.h:754:0: error: "__NR_fcntl" redefined [-Werror]
In file included from /usr/include/sys/syscall.h:4:0,
from /linux/tools/perf/perf-sys.h:7,
from libbpf.c:35:
/usr/include/bits/syscall.h:26:0: note: this is the location of the previous definition
Signed-off-by: Rolf Neugebauer <rn@rneugeba.io>
The kernel configs were constructed by running the 4.18.x config
through the 4.19 oldconfig process.
The 4.19.x has a new option, RANDOM_TRUST_CPU, which indicates
if the CPUs random instruction is to be trusted. It defaults to
"no" and this default was accepted.
Most of the defaults were accepted, except for:
BLK_CGROUP_IOLATENCY=y
NFT_TUNNEL=y
NFT_OSF=y
NFT_TPROXY=y
NETFILTER_XT_MATCH_SOCKET=y
NET_VENDOR_CADENCE=n
NET_VENDOR_NETERION=n
NET_VENDOR_PACKET_ENGINES=n
We also disallow CIFS for insecure legacy servers:
CIFS_ALLOW_INSECURE_LEGACY=n
For arm64, the following changes were made to the default:
SENSORS_RASPBERRYPI_HWMON=y
CRYPTO_DEV_QCOM_RNG=m
CRYPTO_DEV_HISI_SEC=m
For s390x, the additional changes were made to the default:
KERNEL_BZIP2 (default is gzip)
GCC_PLUGINS=y
GCC_PLUGIN_STRUCTLEAK=y
GCC_PLUGIN_STRUCTLEAK_BYREF_ALL=y
GCC_PLUGIN_RANDSTRUCT=y
GCC_PLUGIN_RANDSTRUCT_PERFORMANCE=y
Running the 4.18 and 4.19 kernel config through
./scripts/kconfig-split.py yields the following 4.19.x
only config options for x86_64:
The x86_64 kernel difference to 4.18 for
CONFIG_ARCH_SUPPORTS_ACPI=y
CONFIG_BLK_CGROUP_IOLATENCY=y
CONFIG_BNXT_HWMON=y
CONFIG_BUILD_SALT=""
CONFIG_CONSOLE_LOGLEVEL_QUIET=4
CONFIG_CRASH_CORE=y
CONFIG_HAVE_ARCH_PREL32_RELOCATIONS=y
CONFIG_HAVE_RELIABLE_STACKTRACE=y
CONFIG_MEMCG_KMEM=y
CONFIG_MLX5_EN_ARFS=y
CONFIG_MLX5_EN_RXNFC=y
CONFIG_NETFILTER_NETLINK_OSF=y
CONFIG_NETFILTER_XT_MATCH_SOCKET=y
CONFIG_NFT_OSF=y
CONFIG_NFT_TPROXY=y
CONFIG_NFT_TUNNEL=y
CONFIG_NF_SOCKET_IPV4=y
CONFIG_NF_SOCKET_IPV6=y
CONFIG_XEN_SCRUB_PAGES_DEFAULT=y
Signed-off-by: Rolf Neugebauer <rn@rneugeba.io>
After 'make oldconfig' we check that that the kernel config
is as we expect and error if they don't. We used to print
the default 'diff' output on a mismatch but a unified diff
is easier to read.
Signed-off-by: Rolf Neugebauer <rn@rneugeba.io>
This cherry picks:
- b6fe0440c637 ("bridge: implement missing ndo_uninit()")
- b1b9d366028f ("bridge: move bridge multicast cleanup to ndo_uninit")
The fix is in b1b9d366028f ("bridge: move bridge multicast cleanup
to ndo_uninit") but it requires b6fe0440c637 ("bridge: implement missing
ndo_uninit()"). Furthermore, b1b9d366028f needed some manual resolution
of a cherry-pick conflict because the surrounding code had changed.
Signed-off-by: Rolf Neugebauer <rn@rneugeba.io>
We want to compile BCC for the latest LTS and the latest
stable and missed the update to 4.18 when enabling it. Do
it now.
Signed-off-by: Rolf Neugebauer <rn@rneugeba.io>
Note, this update skips 4.18.2/4.17.16/4.14.64/4.9.121/4.4.149
as the change was a single patch, a bug fix.
Signed-off-by: Rolf Neugebauer <rn@rneugeba.io>
In setup_net() there are a few particularly slow subsystems that
contribute more than 140ms of time to the new net namespace creation
path. The docker daemon doesn't depend on these, and won't modprobe
them into the kernel. Convert these to modules to reduce the amount of
time it takes for docker to start a container. This change takes an
additional ~120 ms of time off container start time.
Signed-off-by: Krister Johansen <krister.johansen@oracle.com>
While investigating performance problems around 'docker run' times, it
was observed that a large amount of time was spent in network namespace
creation. Of that time, a large portion involved waiting for RCU grace
periods to elapse. Increasing HZ causes the periodic timer to check for
quiesced periods more frequently, which consequently reduces the amount
of time RCU callers spend waiting for grace periods and in barrier
waits.
By itself, this change took the amount of time to execute a 'docker run
hello-world' down to 570ms from over 2000ms on 4.14, and down to 390ms
from 1260 on 4.17 and 4.18.
Signed-off-by: Krister Johansen <krister.johansen@oracle.com>
The kernel config was derived from the 4.17.x kernel config
and then tweaked a little. Specifically:
- Enable XDP_SOCKETS
- Enable NFT_CONNLIMIT
- Enable IP_VS_MH
- Enable BPFILTER (as module)
Signed-off-by: Rolf Neugebauer <rn@rneugeba.io>
The 4.14.63 contains important security fixes in particular
against L1TF (CVE-2018-3615, CVE-2018-3620, CVE-2018-3646) and
userspace-userspace SpectreRSB.
Signed-off-by: Rolf Neugebauer <rn@rneugeba.io>
