[fips-8] netfilter: nf_tables: Reject tables of unsupported family

[bmastbergen]

jira VULN-8892
jira VULN-8893
cve CVE-2023-6040

commit-author Phil Sutter <phil@nwl.cc>
commit f1082dd31fe461d482d69da2a8eccfeb7bf07ac2

An nftables family is merely a hollow container, its family just a number and such not reliant on compile-time options other than nftables support itself. Add an artificial check so attempts at using a family the kernel can't support fail as early as possible. This helps user space detect kernels which lack e.g. NFPROTO_INET.

	Signed-off-by: Phil Sutter <phil@nwl.cc>
	Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
(cherry picked from commit f1082dd31fe461d482d69da2a8eccfeb7bf07ac2)
	Signed-off-by: Brett Mastbergen <bmastbergen@ciq.com>

Build Log

/home/brett/kernel-src-tree
Running make mrproper...
[TIMER]{MRPROPER}: 12s
x86_64 architecture detected, copying config
'configs/kernel-x86_64.config' -> '.config'
Setting Local Version for build
CONFIG_LOCALVERSION="-b_f-8-c_4.18.0-553.16.1_VULN-8893-4cb3698565dc"
Making olddefconfig
--
  HOSTLD  scripts/kconfig/conf
scripts/kconfig/conf  --olddefconfig Kconfig
#
# configuration written to .config
#
Starting Build
scripts/kconfig/conf  --syncconfig Kconfig
  SYSTBL  arch/x86/include/generated/asm/syscalls_32.h
  SYSHDR  arch/x86/include/generated/asm/unistd_32_ia32.h
  SYSHDR  arch/x86/include/generated/asm/unistd_64_x32.h
  SYSTBL  arch/x86/include/generated/asm/syscalls_64.h
--
  LD [M]  sound/usb/usx2y/snd-usb-us122l.ko
  LD [M]  sound/virtio/virtio_snd.ko
  LD [M]  sound/x86/snd-hdmi-lpe-audio.ko
  LD [M]  sound/xen/snd_xen_front.ko
  LD [M]  virt/lib/irqbypass.ko
[TIMER]{BUILD}: 1073s
Making Modules
  INSTALL arch/x86/crypto/blowfish-x86_64.ko
  INSTALL arch/x86/crypto/camellia-aesni-avx-x86_64.ko
  INSTALL arch/x86/crypto/camellia-aesni-avx2.ko
  INSTALL arch/x86/crypto/camellia-x86_64.ko
--
  INSTALL sound/virtio/virtio_snd.ko
  INSTALL sound/x86/snd-hdmi-lpe-audio.ko
  INSTALL sound/xen/snd_xen_front.ko
  INSTALL virt/lib/irqbypass.ko
  DEPMOD  4.18.0-b_f-8-c_4.18.0-553.16.1_VULN-8893-4cb3698565dc+
[TIMER]{MODULES}: 13s
Making Install
sh ./arch/x86/boot/install.sh 4.18.0-b_f-8-c_4.18.0-553.16.1_VULN-8893-4cb3698565dc+ arch/x86/boot/bzImage \
	System.map "/boot"
[TIMER]{INSTALL}: 118s
Checking kABI
kABI check passed
Setting Default Kernel to /boot/vmlinuz-4.18.0-b_f-8-c_4.18.0-553.16.1_VULN-8893-4cb3698565dc+ and Index to 0
Hopefully Grub2.0 took everything ... rebooting after time metrices
[TIMER]{MRPROPER}: 12s
[TIMER]{BUILD}: 1073s
[TIMER]{MODULES}: 13s
[TIMER]{INSTALL}: 118s
[TIMER]{TOTAL} 1234s
Rebooting in 10 seconds

Testing

selftest-4.18.0-553.16.1.el8_6.ciqfips.0.9.1.x86_64.log

selftest-4.18.0-b_f-8-c_4.18.0-553.16.1_VULN-8893-4cb3698565dc+.log

brett@lycia ~/ciq/vuln-8893 % grep ^ok selftest-4.18.0-553.16.1.el8_6.ciqfips.0.9.1.x86_64.log | wc -l
296
brett@lycia ~/ciq/vuln-8893 % grep ^ok selftest-4.18.0-b_f-8-c_4.18.0-553.16.1_VULN-8893-4cb3698565dc+.log | wc -l
297
brett@lycia ~/ciq/vuln-8893 %

[thefossguy-ciq]

🚤

[shreeya-patel98]

I just checked that fips 8.6 and fips 8.10 are same. I'm confused, why do we have it like this?

[thefossguy-ciq]

I just checked that fips 8.6 and fips 8.10 are same. I'm confused, why do we have it like this?

Same kernel, different userspace. One is using the LTS-8.6 userspace and another on LTS-8.10, but both of them use the same kernel.