[fips-legacy-8] nvme-tcp: fix potential memory corruption in nvme_tcp_recv_pdu()

[bmastbergen]

jira VULN-56027
cve CVE-2025-21927

commit-author Maurizio Lombardi <mlombard@redhat.com> commit ad95bab0cd28ed77c2c0d0b6e76e03e031391064
upstream-diff Removed `nvme_tcp_c2h_term' case from
              `nvme_tcp_recv_pdu_supported' for the sake of consistency of
              `nvme_tcp_recv_pdu''s behavior relative to the upstream
              version, between the cases of proper and improper
              header. (What could be considered as "`c2h_term' type support"
              started with 84e009042d0f3dfe91bec60bcd208ee3f866cbcd commit,
              not included in `ciqlts9_2''s history, so
              `nvme_tcp_recv_pdu_supported' in `ciqlts9_2' shouldn't report
              the `nvme_tcp_c2h_term' type as supported.)

nvme_tcp_recv_pdu() doesn't check the validity of the header length. When header digests are enabled, a target might send a packet with an invalid header length (e.g. 255), causing nvme_tcp_verify_hdgst() to access memory outside the allocated area and cause memory corruptions by overwriting it with the calculated digest.

Fix this by rejecting packets with an unexpected header length.

Fixes: 3f2304f8c6d6 ("nvme-tcp: add NVMe over TCP host driver")
	Signed-off-by: Maurizio Lombardi <mlombard@redhat.com>
	Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
	Signed-off-by: Keith Busch <kbusch@kernel.org>
(cherry picked from commit ad95bab0cd28ed77c2c0d0b6e76e03e031391064)
	Signed-off-by: Brett Mastbergen <bmastbergen@ciq.com>

Same as #238

Build Log

/home/brett/kernel-src-tree
  CLEAN   scripts/basic
  CLEAN   scripts/kconfig
  CLEAN   include/config include/generated arch/x86/include/generated
  CLEAN   .config .config.old
[TIMER]{MRPROPER}: 12s
x86_64 architecture detected, copying config
'configs/kernel-x86_64.config' -> '.config'
Setting Local Version for build
CONFIG_LOCALVERSION="-b_f-l-8-c_4.18.0-425.13.1_VULN-56027-d0a28ad41d54"
Making olddefconfig
  HOSTCC  scripts/basic/fixdep
  HOSTCC  scripts/kconfig/conf.o
  YACC    scripts/kconfig/zconf.tab.c
  LEX     scripts/kconfig/zconf.lex.c
  HOSTCC  scripts/kconfig/zconf.tab.o
  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
  HYPERCALLS arch/x86/include/generated/asm/xen-hypercalls.h
  SYSHDR  arch/x86/include/generated/uapi/asm/unistd_32.h
  SYSHDR  arch/x86/include/generated/uapi/asm/unistd_64.h
  SYSHDR  arch/x86/include/generated/uapi/asm/unistd_x32.h
  HOSTCC  scripts/basic/bin2c
  WRAP    arch/x86/include/generated/uapi/asm/bpf_perf_event.h
  WRAP    arch/x86/include/generated/uapi/asm/poll.h
  WRAP    arch/x86/include/generated/uapi/asm/socket.h
  UPD     include/config/kernel.release
  UPD     include/generated/uapi/linux/version.h
  UPD     include/generated/utsrelease.h
  DESCEND objtool
  DESCEND bpf/resolve_btfids
  MKDIR     /home/brett/kernel-src-tree/tools/bpf/resolve_btfids//libbpf
  MKDIR     /home/brett/kernel-src-tree/tools/bpf/resolve_btfids//libsubcmd
  HOSTCC  /home/brett/kernel-src-tree/tools/bpf/resolve_btfids/fixdep.o
  HOSTCC  /home/brett/kernel-src-tree/tools/objtool/fixdep.o
  GEN     /home/brett/kernel-src-tree/tools/bpf/resolve_btfids/libbpf/bpf_helper_defs.h
  HOSTLD  /home/brett/kernel-src-tree/tools/bpf/resolve_btfids/fixdep-in.o
  HOSTLD  /home/brett/kernel-src-tree/tools/objtool/fixdep-in.o
  LINK    /home/brett/kernel-src-tree/tools/objtool/fixdep
  LINK    /home/brett/kernel-src-tree/tools/bpf/resolve_btfids/fixdep
  CC      /home/brett/kernel-src-tree/tools/bpf/resolve_btfids/main.o
  CC      /home/brett/kernel-src-tree/tools/bpf/resolve_btfids/rbtree.o
  CC      /home/brett/kernel-src-tree/tools/bpf/resolve_btfids/zalloc.o

[SNIP]

  INSTALL sound/soc/sof/snd-sof.ko
  INSTALL sound/soc/sof/xtensa/snd-sof-xtensa-dsp.ko
  INSTALL sound/soundcore.ko
  INSTALL sound/synth/emux/snd-emux-synth.ko
  INSTALL sound/synth/snd-util-mem.ko
  INSTALL sound/usb/6fire/snd-usb-6fire.ko
  INSTALL sound/usb/bcd2000/snd-bcd2000.ko
  INSTALL sound/usb/caiaq/snd-usb-caiaq.ko
  INSTALL sound/usb/hiface/snd-usb-hiface.ko
  INSTALL sound/usb/line6/snd-usb-line6.ko
  INSTALL sound/usb/line6/snd-usb-pod.ko
  INSTALL sound/usb/line6/snd-usb-podhd.ko
  INSTALL sound/usb/line6/snd-usb-toneport.ko
  INSTALL sound/usb/line6/snd-usb-variax.ko
  INSTALL sound/usb/misc/snd-ua101.ko
  INSTALL sound/usb/snd-usb-audio.ko
  INSTALL sound/usb/snd-usbmidi-lib.ko
  INSTALL sound/usb/usx2y/snd-usb-us122l.ko
  INSTALL sound/usb/usx2y/snd-usb-usx2y.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-l-8-c_4.18.0-425.13.1_VULN-56027-d0a28ad41d54+
[TIMER]{MODULES}: 11s
Making Install
sh ./arch/x86/boot/install.sh 4.18.0-b_f-l-8-c_4.18.0-425.13.1_VULN-56027-d0a28ad41d54+ arch/x86/boot/bzImage \
	System.map "/boot"
[TIMER]{INSTALL}: 103s
Checking kABI
Checking kABI
kABI check passed
Setting Default Kernel to /boot/vmlinuz-4.18.0-b_f-l-8-c_4.18.0-425.13.1_VULN-56027-d0a28ad41d54+ and Index to 0
Hopefully Grub2.0 took everything ... rebooting after time metrices
[TIMER]{MRPROPER}: 12s
[TIMER]{BUILD}: 989s
[TIMER]{MODULES}: 11s
[TIMER]{INSTALL}: 103s
[TIMER]{TOTAL} 1131s
Rebooting in 10 seconds

Testing

kselftests were run before and after applying the fix

selftest-4.18.0-425.13.1.el8.ciqfipscompliant.39.1.x86_64.log

selftest-4.18.0-b_f-l-8-c_4.18.0-425.13.1_VULN-56027-d0a28ad41d54+.log

brett@lycia ~/ciq/vuln-56027 % grep ^ok selftest-4.18.0-425.13.1.el8.ciqfipscompliant.39.1.x86_64.log | wc -l
214
brett@lycia ~/ciq/vuln-56027 % grep ^ok selftest-4.18.0-b_f-l-8-c_4.18.0-425.13.1_VULN-56027-d0a28ad41d54+.log | wc -l
215
brett@lycia ~/ciq/vuln-56027 %

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