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HistoryJan 05, 2018 - 12:06 p.m.

Security update for the Linux Kernel (important)






The openSUSE Leap 42.3 kernel was updated to 4.4.104 to receive various
security and bugfixes.

This update adds mitigations for various side channel attacks against
modern CPUs that could disclose content of otherwise unreadable memory

  • CVE-2017-5753 / "SpectreAttack": Local attackers on systems with modern
    CPUs featuring deep instruction pipelining could use attacker
    controllable speculative execution over code patterns in the Linux
    Kernel to leak content from otherwise not readable memory in the same
    address space, allowing retrieval of passwords, cryptographic keys and
    other secrets.

    This problem is mitigated by adding speculative fencing on affected code
    paths throughout the Linux kernel.

  • CVE-2017-5715 / "SpectreAttack": Local attackers on systems with modern
    CPUs featuring branch prediction could use mispredicted branches to
    speculatively execute code patterns that in turn could be made to leak
    other non-readable content in the same address space, an attack similar
    to CVE-2017-5753.

    This problem is mitigated by disabling predictive branches, depending
    on CPU architecture either by firmware updates and/or fixes in the
    user-kernel privilege boundaries.

    Please also check with your CPU / Hardware vendor on updated firmware
    or BIOS images regarding this issue.

    As this feature can have a performance impact, it can be disabled using
    the "nospec" kernel commandline option.

  • CVE-2017-5754 / "MeltdownAttack": Local attackers on systems with modern
    CPUs featuring deep instruction pipelining could use code patterns in
    userspace to speculative executive code that would read
    otherwise read protected memory, an attack similar to CVE-2017-5753.

    This problem is mitigated by unmapping the Linux Kernel from the user
    address space during user code execution, following a approach called
    "KAISER". The terms used here are "KAISER" / "Kernel Address Isolation"
    and "PTI" / "Page Table Isolation".

    Note that this is only done on affected platforms.

    This feature can be enabled / disabled by the "pti=[on|off|auto]" or
    "nopti" commandline options.

The following security bugs were fixed:

  • CVE-2017-17806: The HMAC implementation (crypto/hmac.c) in the Linux
    kernel did not validate that the underlying cryptographic hash algorithm
    is unkeyed, allowing a local attacker able to use the AF_ALG-based hash
    interface (CONFIG_CRYPTO_USER_API_HASH) and the SHA-3 hash algorithm
    (CONFIG_CRYPTO_SHA3) to cause a kernel stack buffer overflow by
    executing a crafted sequence of system calls that encounter a missing
    SHA-3 initialization (bnc#1073874).
  • CVE-2017-17805: The Salsa20 encryption algorithm in the Linux kernel did
    not correctly handle zero-length inputs, allowing a local attacker able
    to use the AF_ALG-based skcipher interface
    (CONFIG_CRYPTO_USER_API_SKCIPHER) to cause a denial of service
    (uninitialized-memory free and kernel crash) or have unspecified other
    impact by executing a crafted sequence of system calls that use the
    blkcipher_walk API. Both the generic implementation
    (crypto/salsa20_generic.c) and x86 implementation
    (arch/x86/crypto/salsa20_glue.c) of Salsa20 were vulnerable

The following non-security bugs were fixed:

  • Add undefine _unique_build_ids (bsc#964063)
  • alsa: hda - Add HP ZBook 15u G3 Conexant CX20724 GPIO mute leds
  • alsa: hda - Add MIC_NO_PRESENCE fixup for 2 HP machines (bsc#1031717).
  • alsa: hda - Add mute led support for HP EliteBook 840 G3 (bsc#1031717).
  • alsa: hda - Add mute led support for HP ProBook 440 G4 (bsc#1031717).
  • alsa: hda - add support for docking station for HP 820 G2 (bsc#1031717).
  • alsa: hda - add support for docking station for HP 840 G3 (bsc#1031717).
  • alsa: hda - change the location for one mic on a Lenovo machine
  • alsa: hda: Drop useless WARN_ON() (bsc#1031717).
  • alsa: hda - Fix click noises on Samsung Ativ Book 8 (bsc#1031717).
  • alsa: hda - fix headset mic detection issue on a Dell machine
  • alsa: hda - fix headset mic problem for Dell machines with alc274
  • alsa: hda - Fix headset microphone detection for ASUS N551 and N751
  • alsa: hda - Fix mic regression by ASRock mobo fixup (bsc#1031717).
  • alsa: hda - Fix missing COEF init for ALC225/295/299 (bsc#1031717).
  • alsa: hda - Fix surround output pins for ASRock B150M mobo (bsc#1031717).
  • alsa: hda - On-board speaker fixup on ACER Veriton (bsc#1031717).
  • alsa: hda/realtek - Add ALC256 HP depop function (bsc#1031717).
  • alsa: hda/realtek - Add default procedure for suspend and resume state
  • alsa: hda/realtek - Add support for Acer Aspire E5-475 headset mic
  • alsa: hda/realtek - Add support for ALC1220 (bsc#1031717).
  • alsa: hda/realtek - Add support for headset MIC for ALC622 (bsc#1031717).
  • alsa: hda/realtek - ALC891 headset mode for Dell (bsc#1031717).
  • alsa: hda/realtek - change the location for one of two front microphones
  • alsa: hda/realtek - Enable jack detection function for Intel ALC700
  • alsa: hda/realtek - Fix ALC275 no sound issue (bsc#1031717).
  • alsa: hda/realtek - Fix Dell AIO LineOut issue (bsc#1031717).
  • alsa: hda/realtek - Fix headset and mic on several Asus laptops with
    ALC256 (bsc#1031717).
  • alsa: hda/realtek - Fix headset mic and speaker on Asus X441SA/X441UV
  • alsa: hda/realtek - fix headset mic detection for MSI MS-B120
  • alsa: hda/realtek - Fix headset mic on several Asus laptops with ALC255
  • alsa: hda/realtek - Fix pincfg for Dell XPS 13 9370 (bsc#1031717).
  • alsa: hda/realtek - Fix speaker support for Asus AiO ZN270IE
  • alsa: hda/realtek - Fix typo of pincfg for Dell quirk (bsc#1031717).
  • alsa: hda/realtek - New codec device ID for ALC1220 (bsc#1031717).
  • alsa: hda/realtek - New codecs support for ALC215/ALC285/ALC289
  • alsa: hda/realtek - New codec support for ALC257 (bsc#1031717).
  • alsa: hda/realtek - New codec support of ALC1220 (bsc#1031717).
  • alsa: hda/realtek - No loopback on ALC225/ALC295 codec (bsc#1031717).
  • alsa: hda/realtek - Remove ALC285 device ID (bsc#1031717).
  • alsa: hda/realtek - Support Dell headset mode for ALC3271 (bsc#1031717).
  • alsa: hda/realtek - Support headset mode for ALC234/ALC274/ALC294
  • alsa: hda/realtek - There is no loopback mixer in the ALC234/274/294
  • alsa: hda/realtek - Update headset mode for ALC225 (bsc#1031717).
  • alsa: hda/realtek - Update headset mode for ALC298 (bsc#1031717).
  • alsa: hda - Skip Realtek SKU check for Lenovo machines (bsc#1031717).
  • alsa: pcm: prevent UAF in snd_pcm_info (bsc#1031717).
  • alsa: rawmidi: Avoid racy info ioctl via ctl device (bsc#1031717).
  • alsa: seq: Remove spurious WARN_ON() at timer check (bsc#1031717).
  • alsa: usb-audio: Add check return value for usb_string() (bsc#1031717).
  • alsa: usb-audio: Fix out-of-bound error (bsc#1031717).
  • alsa: usb-audio: Fix the missing ctl name suffix at parsing SU
  • apei / ERST: Fix missing error handling in erst_reader() (bsc#1072556).
  • arm: dts: omap3: logicpd-torpedo-37xx-devkit: Fix MMC1 cd-gpio
  • arm: Hide finish_arch_post_lock_switch() from modules (bsc#1068032).
  • asoc: fsl_ssi: AC’97 ops need regmap, clock and cleaning up on failure
  • asoc: twl4030: fix child-node lookup (bsc#1031717).
  • asoc: wm_adsp: Fix validation of firmware and coeff lengths
  • autofs: fix careless error in recent commit (bnc#1012382 bsc#1065180).
  • bcache: Fix building error on MIPS (bnc#1012382).
  • bnxt_en: Do not print "Link speed -1 no longer supported" messages
  • bpf: prevent speculative execution in eBPF interpreter (bnc#1068032).
  • btrfs: clear space cache inode generation always (bnc#1012382).
  • btrfs: embed extent_changeset::range_changed to the structure (dependent
    patch, bsc#1031395).
  • btrfs: qgroup: Fix qgroup reserved space underflow by only freeing
    reserved ranges (bsc#1031395).
  • btrfs: qgroup: Fix qgroup reserved space underflow caused by buffered
    write and quotas being enabled (bsc#1031395).
  • btrfs: qgroup: Introduce extent changeset for qgroup reserve functions
    (dependent patch, bsc#1031395).
  • btrfs: qgroup: Return actually freed bytes for qgroup release or free
    data (bsc#1031395).
  • btrfs: qgroup-test: Fix backport error in qgroup selftest (just to make
  • btrfs: ulist: make the finalization function public (dependent patch,
  • btrfs: ulist: rename ulist_fini to ulist_release (dependent patch,
  • carl9170: prevent speculative execution (bnc#1068032).
  • ceph: drop negative child dentries before try pruning inode’s alias
  • Check cmdline_find_option() retval properly and use boot_cpu_has().
  • cifs: Fix NULL pointer deref on SMB2_tcon() failure (bsc#1071009).
  • cw1200: prevent speculative execution (bnc#1068032).
  • drm/radeon: fix atombios on big endian (bnc#1012382).
  • e1000e: Fix e1000_check_for_copper_link_ich8lan return value
  • eeprom: at24: check at24_read/write arguments (bnc#1012382).
  • Fix unsed variable warning in has_unmovable_pages (bsc#1073868).
  • fs: prevent speculative execution (bnc#1068032).
  • genwqe: Take R/W permissions into account when dealing with memory pages
  • ibmvnic: Include header descriptor support for ARP packets (bsc#1073912).
  • ibmvnic: Increase maximum number of RX/TX queues (bsc#1073912).
  • ib/uverbs: Fix command checking as part of ib_uverbs_ex_modify_qp()
    (FATE#321231 FATE#321473 FATE#322153 FATE#322149).
  • ip_gre: remove the incorrect mtu limit for ipgre tap (bsc#1022912
  • ipv6: prevent speculative execution (bnc#1068032).
  • iw_cxgb4: fix misuse of integer variable (bsc#963897,FATE#320114).
  • iw_cxgb4: only insert drain cqes if wq is flushed (bsc#321658
    FATE#1005778 bsc#321660 FATE#1005780 bsc#321661 FATE#1005781).
  • iw_cxgb4: reflect the original WR opcode in drain cqes (bsc#321658
    FATE#1005778 bsc#321660 FATE#1005780 bsc#321661 FATE#1005781).
  • iw_cxgb4: when flushing, complete all wrs in a chain (bsc#321658
    FATE#1005778 bsc#321660 FATE#1005780 bsc#321661 FATE#1005781).
  • kabi fix for new hash_cred function (bsc#1012917).
  • kaiser: add "nokaiser" boot option, using ALTERNATIVE.
  • kaiser: align addition to x86/mm/Makefile.
  • kaiser: asm/tlbflush.h handle noPGE at lower level.
  • kaiser: cleanups while trying for gold link.
  • kaiser: disabled on Xen PV.
  • kaiser: do not set _PAGE_NX on pgd_none.
  • kaiser: drop is_atomic arg to kaiser_pagetable_walk().
  • kaiser: enhanced by kernel and user PCIDs.
  • kaiser: ENOMEM if kaiser_pagetable_walk() NULL.
  • kaiser: fix build and FIXME in alloc_ldt_struct().
  • kaiser: fix perf crashes.
  • kaiser: fix regs to do_nmi() ifndef CONFIG_KAISER.
  • kaiser: fix unlikely error in alloc_ldt_struct().
  • kaiser: KAISER depends on SMP.
  • kaiser: kaiser_flush_tlb_on_return_to_user() check PCID.
  • kaiser: kaiser_remove_mapping() move along the pgd.
  • kaiser: Kernel Address Isolation.
  • kaiser: load_new_mm_cr3() let SWITCH_USER_CR3 flush.
  • kaiser: load_new_mm_cr3() let SWITCH_USER_CR3 flush user.
  • kaiser: name that 0x1000 KAISER_SHADOW_PGD_OFFSET.
  • kaiser: paranoid_entry pass cr3 need to paranoid_exit.
  • kaiser: PCID 0 for kernel and 128 for user.
  • kaiser: _pgd_alloc() without __GFP_REPEAT to avoid stalls.
  • kaiser: stack map PAGE_SIZE at THREAD_SIZE-PAGE_SIZE.
  • kaiser: tidied up asm/kaiser.h somewhat.
  • kaiser: tidied up kaiser_add/remove_mapping slightly.
  • kaiser: use ALTERNATIVE instead of x86_cr3_pcid_noflush.
  • kaiser: vmstat show NR_KAISERTABLE as nr_overhead.
  • kaiser: x86_cr3_pcid_noflush and x86_cr3_pcid_user.
  • kvm: SVM: Do not intercept new speculative control MSRs (bsc#1068032).
  • kvm: x86: Add speculative control CPUID support for guests (bsc#1068032).
  • kvm: x86: Exit to user-mode on #UD intercept when emulator requires
  • kvm: x86: inject exceptions produced by x86_decode_insn (bnc#1012382).
  • kvm: x86: pvclock: Handle first-time write to pvclock-page contains
    random junk (bnc#1012382).
  • locking/barriers: introduce new memory barrier gmb() (bnc#1068032).
  • mmc: core: Do not leave the block driver in a suspended state
  • mm/mmu_context, sched/core: Fix mmu_context.h assumption (bsc#1068032).
  • mtd: nand: Fix writing mtdoops to nand flash (bnc#1012382).
  • netlink: add a start callback for starting a netlink dump (bnc#1012382).
  • net/mlx5e: DCBNL, Implement tc with ets type and zero bandwidth
    (bsc#966170 FATE#320225 bsc#966172 FATE#320226).
  • net/mlx5e: Fix ETS BW check (bsc#966170 FATE#320225 bsc#966172
  • net/mlx5: Fix error flow in CREATE_QP command (bsc#1015342 FATE#321688
    bsc#1015343 FATE#321689).
  • net: mpls: prevent speculative execution (bnc#1068032).
  • nfsd: Fix another OPEN stateid race (bnc#1012382).
  • nfsd: Fix stateid races between OPEN and CLOSE (bnc#1012382).
  • nfsd: Make init_open_stateid() a bit more whole (bnc#1012382).
  • nfs: improve shinking of access cache (bsc#1012917).
  • nfs: revalidate "." etc correctly on "open" (bsc#1068951).
  • nfs: revalidate "." etc correctly on "open" (git-fixes). Fix References:
  • nfsv4: always set NFS_LOCK_LOST when a lock is lost (bsc#1068951).
  • nvme-fabrics: introduce init command check for a queue that is not alive
  • nvme-fc: check if queue is ready in queue_rq (bsc#1072890).
  • nvme-fc: do not use bit masks for set/test_bit() numbers (bsc#1072890).
  • nvme-loop: check if queue is ready in queue_rq (bsc#1072890).
  • nvmet-fc: cleanup nvmet add_port/remove_port (bsc#1072890).
  • nvmet_fc: correct broken add_port (bsc#1072890).
  • p54: prevent speculative execution (bnc#1068032).
  • powerpc/barrier: add gmb.
  • powerpc: Secure memory rfi flush (bsc#1068032).
  • ptrace: Add a new thread access check (bsc#1068032).
  • qla2xxx: prevent speculative execution (bnc#1068032).
  • Revert "drm/radeon: dont switch vt on suspend" (bnc#1012382).
  • Revert "ipsec: Fix aborted xfrm policy dump crash" (kabi).
  • Revert "netlink: add a start callback for starting a netlink dump"
  • s390: add ppa to system call and program check path (bsc#1068032).
  • s390: introduce CPU alternatives.
  • s390: introduce CPU alternatives (bsc#1068032).
  • s390/qeth: add missing hash table initializations (bnc#1072216,
  • s390/qeth: fix early exit from error path (bnc#1072216, LTC#162173).
  • s390/qeth: fix thinko in IPv4 multicast address tracking (bnc#1072216,
  • s390/spinlock: add gmb memory barrier
  • s390/spinlock: add gmb memory barrier (bsc#1068032).
  • s390/spinlock: add ppa to system call path Signoff the s390 patches.
  • sched/core: Add switch_mm_irqs_off() and use it in the scheduler
  • sched/core: Idle_task_exit() shouldn’t use switch_mm_irqs_off()
  • sched/rt: Do not pull from current CPU if only one CPU to pull
  • scsi_dh_alua: skip RTPG for devices only supporting active/optimized
  • scsi: lpfc: correct sg_seg_cnt attribute min vs default (bsc#1072166).
  • scsi: qedi: Limit number for CQ queues (bsc#1072866).
  • scsi_scan: Exit loop if TUR to LUN0 fails with 0x05/0x25 (bsc#1063043).
    This is specific to FUJITSU ETERNUS_DX* targets. They can return
    "Illegal Request - Logical unit not supported" and processing should
    leave the timeout loop in this case.
  • scsi: ses: check return code from ses_recv_diag() (bsc#1039616).
  • scsi: ses: Fixup error message ‘failed to get diagnostic page
    0xffffffea’ (bsc#1039616).
  • scsi: ses: Fix wrong page error (bsc#1039616).
  • scsi: ses: make page2 support optional (bsc#1039616).
  • sfc: pass valid pointers from efx_enqueue_unwind (bsc#1017967
  • sunrpc: add auth_unix hash_cred() function (bsc#1012917).
  • sunrpc: add generic_auth hash_cred() function (bsc#1012917).
  • sunrpc: add hash_cred() function to rpc_authops struct (bsc#1012917).
  • sunrpc: add RPCSEC_GSS hash_cred() function (bsc#1012917).
  • sunrpc: replace generic auth_cred hash with auth-specific function
  • sunrpc: use supplimental groups in auth hash (bsc#1012917).
  • Thermal/int340x: prevent speculative execution (bnc#1068032).
  • udf: prevent speculative execution (bnc#1068032).
  • Update config files: enable KAISER.
  • usb: host: fix incorrect updating of offset (bsc#1047487).
  • userns: prevent speculative execution (bnc#1068032).
  • uvcvideo: prevent speculative execution (bnc#1068032).
  • vxlan: correctly handle ipv6.disable module parameter (bsc#1072962).
  • x86/boot: Add early cmdline parsing for options with arguments.
  • x86/CPU/AMD: Add speculative control support for AMD (bsc#1068032).
  • x86/CPU/AMD: Make the LFENCE instruction serialized (bsc#1068032).
  • x86/CPU/AMD: Remove now unused definition of MFENCE_RDTSC feature
  • x86/CPU: Check speculation control CPUID bit (bsc#1068032).
  • x86/efi-bgrt: Replace early_memremap() with memremap() (bnc#1012382).
  • x86/enter: Add macros to set/clear IBRS and set IBPB (bsc#1068032).
  • x86/entry: Add a function to overwrite the RSB (bsc#1068032).
  • x86/entry: Stuff RSB for entry to kernel for non-SMEP platform
  • x86/entry: Use IBRS on entry to kernel space (bsc#1068032).
  • x86/feature: Enable the x86 feature to control Speculation (bsc#1068032).
  • x86/idle: Disable IBRS when offlining a CPU and re-enable on wakeup
  • x86/idle: Toggle IBRS when going idle (bsc#1068032).
  • x86/kaiser: Check boottime cmdline params.
  • x86/kaiser: Move feature detection up (bsc#1068032).
  • x86/kaiser: Reenable PARAVIRT.
  • x86/kaiser: Rename and simplify X86_FEATURE_KAISER handling.
  • x86/kvm: add MSR_IA32_SPEC_CTRL and MSR_IA32_PRED_CMD to kvm
  • x86/kvm: Add MSR_IA32_SPEC_CTRL and MSR_IA32_PRED_CMD to kvm
  • x86/kvm: Flush IBP when switching VMs (bsc#1068032).
  • x86/kvm: Pad RSB on VM transition (bsc#1068032).
  • x86/kvm: Toggle IBRS on VM entry and exit (bsc#1068032).
  • x86/mm/64: Fix reboot interaction with CR4.PCIDE (bsc#1068032).
  • x86/mm: Add a ‘noinvpcid’ boot option to turn off INVPCID (bsc#1068032).
  • x86/mm: Add INVPCID helpers (bsc#1068032).
  • x86/mm: Add the ‘nopcid’ boot option to turn off PCID (bsc#1068032).
  • x86/mm: Build arch/x86/mm/tlb.c even on !SMP (bsc#1068032).
  • x86/mm: Enable CR4.PCIDE on supported systems (bsc#1068032).
  • x86/mm: Fix INVPCID asm constraint (bsc#1068032).
  • x86/mm: If INVPCID is available, use it to flush global mappings
  • x86/mm: Make flush_tlb_mm_range() more predictable (bsc#1068032).
  • x86/mm: Only set IBPB when the new thread cannot ptrace current thread
  • x86/mm: Reimplement flush_tlb_page() using flush_tlb_mm_range()
  • x86/mm: Remove flush_tlb() and flush_tlb_current_task() (bsc#1068032).
  • x86/mm: Remove the UP asm/tlbflush.h code, always use the (formerly) SMP
    code (bsc#1068032).
  • x86/mm, sched/core: Turn off IRQs in switch_mm() (bsc#1068032).
  • x86/mm, sched/core: Uninline switch_mm() (bsc#1068032).
  • x86/mm: Set IBPB upon context switch (bsc#1068032).
  • x86/MSR: Move native_*msr(… u64) to msr.h (bsc#1068032).
  • x86/paravirt: Dont patch flush_tlb_single (bsc#1068032).
  • x86/spec: Add IBRS control functions (bsc#1068032).
  • x86/spec: Add "nospec" chicken bit (bsc#1068032).
  • x86/spec: Check CPUID direclty post microcode reload to support IBPB
    feature (bsc#1068032).
  • x86/spec_ctrl: Add an Indirect Branch Predictor barrier (bsc#1068032).
  • x86/spec_ctrl: Check whether IBPB is enabled before using it
  • x86/spec_ctrl: Check whether IBRS is enabled before using it
  • x86/svm: Add code to clear registers on VM exit (bsc#1068032).
  • x86/svm: Clobber the RSB on VM exit (bsc#1068032).
  • x86/svm: Set IBPB when running a different VCPU (bsc#1068032).
  • x86/svm: Set IBRS value on VM entry and exit (bsc#1068032).