SUSE-SU-2018:0180-1

The SUSE Linux Enterprise 11 SP4 realtime kernel was updated 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 (bnc#1068032).

• CVE-2017-5753: 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: 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.

  This is done with help of Linux Kernel fixes on the Intel/AMD x8664 architectures. On x8664, this requires also updates of the CPU microcode packages, delivered in seperate updates.

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

• CVE-2017-5754: 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'.

The following security bugs were fixed:

• CVE-2017-11600: net/xfrm/xfrmpolicy.c in the Linux kernel did not ensure that the dir value of xfrmuserpolicyid is XFRMPOLICYMAX or less, which allowed local users to cause a denial of service (out-of-bounds access) or possibly have unspecified other impact via an XFRMMSG_MIGRATE xfrm Netlink message (bnc#1050231).
• CVE-2017-13167: An elevation of privilege vulnerability in the kernel sound timer was fixed. (bnc#1072876).
• CVE-2017-14106: The tcpdisconnect function in net/ipv4/tcp.c in the Linux kernel allowed local users to cause a denial of service (tcpselectwindow divide-by-zero error and system crash) by triggering a disconnect within a certain tcprecvmsg code path (bnc#1056982).
• CVE-2017-15102: The tower_probe function in drivers/usb/misc/legousbtower.c in the Linux kernel allowed local users (who are physically proximate for inserting a crafted USB device) to gain privileges by leveraging a write-what-where condition that occurs after a race condition and a NULL pointer dereference (bnc#1066705).
• CVE-2017-15115: The sctpdopeeloff function in net/sctp/socket.c in the Linux kernel did not check whether the intended netns is used in a peel-off action, which allowed local users to cause a denial of service (use-after-free and system crash) or possibly have unspecified other impact via crafted system calls (bnc#1068671).
• CVE-2017-15868: The bnepaddconnection function in net/bluetooth/bnep/core.c in the Linux kernel did not ensure that an l2cap socket is available, which allowed local users to gain privileges via a crafted application (bnc#1071470).
• CVE-2017-16525: The usbserialconsole_disconnect function in drivers/usb/serial/console.c in the Linux kernel allowed local users to cause a denial of service (use-after-free and system crash) or possibly have unspecified other impact via a crafted USB device, related to disconnection and failed setup (bnc#1066618).
• CVE-2017-16527: sound/usb/mixer.c in the Linux kernel allowed local users to cause a denial of service (sndusbmixer_interrupt use-after-free and system crash) or possibly have unspecified other impact via a crafted USB device (bnc#1066625).
• CVE-2017-16529: The sndusbcreate_streams function in sound/usb/card.c in the Linux kernel allowed local users to cause a denial of service (out-of-bounds read and system crash) or possibly have unspecified other impact via a crafted USB device (bnc#1066650).
• CVE-2017-16531: drivers/usb/core/config.c in the Linux kernel allowed local users to cause a denial of service (out-of-bounds read and system crash) or possibly have unspecified other impact via a crafted USB device, related to the USBDTINTERFACE_ASSOCIATION descriptor (bnc#1066671).
• CVE-2017-16534: The cdcparsecdc_header function in drivers/usb/core/message.c in the Linux kernel allowed local users to cause a denial of service (out-of-bounds read and system crash) or possibly have unspecified other impact via a crafted USB device (bnc#1066693).
• CVE-2017-16535: The usbgetbos_descriptor function in drivers/usb/core/config.c in the Linux kernel allowed local users to cause a denial of service (out-of-bounds read and system crash) or possibly have unspecified other impact via a crafted USB device (bnc#1066700).
• CVE-2017-16536: The cx231xxusbprobe function in drivers/media/usb/cx231xx/cx231xx-cards.c in the Linux kernel allowed local users to cause a denial of service (NULL pointer dereference and system crash) or possibly have unspecified other impact via a crafted USB device (bnc#1066606).
• CVE-2017-16537: The imon_probe function in drivers/media/rc/imon.c in the Linux kernel allowed local users to cause a denial of service (NULL pointer dereference and system crash) or possibly have unspecified other impact via a crafted USB device (bnc#1066573).
• CVE-2017-16538: drivers/media/usb/dvb-usb-v2/lmedm04.c in the Linux kernel allowed local users to cause a denial of service (general protection fault and system crash) or possibly have unspecified other impact via a crafted USB device, related to a missing warm-start check and incorrect attach timing (dm04lme2510frontendattach versus dm04lme2510_tuner) (bnc#1066569).
• CVE-2017-16649: The usbnetgenericcdcbind function in drivers/net/usb/cdcether.c in the Linux kernel allowed local users to cause a denial of service (divide-by-zero error and system crash) or possibly have unspecified other impact via a crafted USB device (bnc#1067085).
• CVE-2017-16939: The XFRM dump policy implementation in net/xfrm/xfrmuser.c in the Linux kernel allowed local users to gain privileges or cause a denial of service (use-after-free) via a crafted SORCVBUF setsockopt system call in conjunction with XFRMMSGGETPOLICY Netlink messages (bnc#1069702).
• CVE-2017-17450: net/netfilter/xtosf.c in the Linux kernel did not require the CAPNETADMIN capability for addcallback and removecallback operations, which allowed local users to bypass intended access restrictions because the xtosf_fingers data structure is shared across all net namespaces (bnc#1071695).
• CVE-2017-17558: The usbdestroyconfiguration function in drivers/usb/core/config.c in the USB core subsystem in the Linux kernel did not consider the maximum number of configurations and interfaces before attempting to release resources, which allowed local users to cause a denial of service (out-of-bounds write access) or possibly have unspecified other impact via a crafted USB device (bnc#1072561).
• 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 AFALG-based skcipher interface (CONFIGCRYPTOUSERAPISKCIPHER) 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 blkcipherwalk API. Both the generic implementation (crypto/salsa20generic.c) and x86 implementation (arch/x86/crypto/salsa20glue.c) of Salsa20 were vulnerable (bnc#1073792).
• 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 AFALG-based hash interface (CONFIGCRYPTOUSERAPIHASH) and the SHA-3 hash algorithm (CONFIGCRYPTO_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-2017-7472: The KEYS subsystem in the Linux kernel allowed local users to cause a denial of service (memory consumption) via a series of KEYREQKEYDEFLTHREADKEYRING keyctlsetreqkey_keyring calls (bnc#1034862).
• CVE-2017-8824: The dccpdisconnect function in net/dccp/proto.c in the Linux kernel allowed local users to gain privileges or cause a denial of service (use-after-free) via an AFUNSPEC connect system call during the DCCP_LISTEN state (bnc#1070771).

The following non-security bugs were fixed:

• Add upstream RT preemption points to block/blk-iopoll.c and net/core/dev.c
• adm80211: return an error if adm8211allocrings() fails (bsc#1048185).
• alsa: core: Fix unexpected error at replacing user TLV (bsc#1045538).
• alsa: hda/ca0132 - Fix memory leak at error path (bsc#1045538).
• alsa: timer: Add missing mutex lock for compat ioctls (bsc#1045538).
• asm alternatives: remove incorrect alignment notes.
• audit: Fix use after free in auditremovewatch_rule() (bsc#1045205).
• autofs: do not fail mount for transient error (bsc#1065180).
• autofs: fix careless error in recent commit (bsc#1065180).
• blacklist.conf: Add PCI ASPM fix to blacklist (bsc#1045538)
• blacklist.conf: Blacklisted commit 2b1be689f3aadcfe0 ('printk/console: Always disable boot consoles that use init memory before it is freed')
• bpf: prevent speculative execution in eBPF interpreter (bnc#1068032).
• carl9170: prevent speculative execution (bnc#1068032).
• dm bufio: fix integer overflow when limiting maximum cache size (git-fixes).
• ecryptfs: fix dereference of NULL userkeypayload (bsc#1013018).
• eCryptfs: use after free in ecryptfsreleasemessaging() (bsc#1013018).
• fnic: Use the local variable instead of I/O flag to acquire ioreqlock in fnic_queuecommand() to avoid deadloack (bsc#1067816).
• fs/9p: Compare qid.path in v9fstestinode (bsc#1013018).
• fs-cache: fix dereference of NULL userkeypayload (git-fixes).
• fs: prevent speculative execution (bnc#1068032). [jkosina@suse.cz: hack around kABI; this should be done in separate patch in patches.kabi eventually]
• isa: Prevent NULL dereference in isa_bus driver callbacks (bsc#1045538).
• kabi fix for new hash_cred function (bsc#1012917).
• kabi: silence spurious kabi error in net/sctp/socket.c (bsc#1068671).
• kaiser: add 'nokaiser' boot option, using ALTERNATIVE.
• kaiser: fix ldt freeing.
• kaiser: Kernel Address Isolation.
• kaiser: use ALTERNATIVE instead of x86cr3pcid_noflush.
• kaiser: work around kABI.
• kvm: SVM: Do not intercept new speculative control MSRs (bsc#1068032).
• kvm: x86: Add speculative control CPUID support for guests (bsc#1068032).
• locking/barriers: introduce new memory barrier gmb() (bnc#1068032).
• lpfc: check for valid scsi cmnd in lpfcscsicmdiocbcmpl() (bsc#1051133).
• mac80211: do not compare TKIP TX MIC key in reinstall prevention (bsc#1066472).
• media: cx231xx-cards: fix NULL-deref at probe (bsc#1050431).
• mm/madvise.c: fix madvise() infinite loop under special circumstances (bnc#1070964).
• mm/mmucontext, sched/core: Fix mmucontext.h assumption.
• nfs: Fix ugly referral attributes (git-fixes).
• nfs: improve shinking of access cache (bsc#1012917).
• p54: prevent speculative execution (bnc#1068032).
• powerpc/barrier: add gmb.
• powerpc: Correct instruction code for xxlor instruction (bsc#1064861, git-fixes).
• powerpc: Fix emulation of mfocrf in emulate_step() (bsc#1064861, git-fixes).
• powerpc/mm: Fix check of multiple 16G pages from device tree (bsc#1064861, git-fixes).
• powerpc/pseries/vio: Dispose of virq mapping on vdevice unregister (bsc#1067888, git-fixes f2ab6219969f).
• powerpc-rfi-flush.patch: disable due to boot failure
• powerpc: Secure memory rfi flush (bsc#1068032).
• pti: unbreak EFI (bsc#1074709).
• ptrace: Add a new thread access check (bsc#1068032).
• qeth: check not more than 16 SBALEs on the completion queue (bnc#1072457, LTC#148203).
• Revert 'mac80211: accept key reinstall without changing anything'
• s390: add ppa to system call and program check path (bsc#1068032).
• s390/disassembler: correct disassembly lines alignment (bnc#1066973, LTC#161577).
• s390/disassembler: increase show_code buffer size (bnc#1066973, LTC#161577).
• s390: fix transactional execution control register handling (bnc#1072457, LTC#162116).
• s390: introduce CPU alternatives.
• s390: introduce CPU alternatives (bsc#1068032).
• s390/spinlock: add gmb memory barrier.
• s390/spinlock: add gmb memory barrier (bsc#1068032).
• s390/spinlock: add ppa to system call path.
• sched/core: Add switchmmirqs_off() and use it in the scheduler.
• sched/core: Idletaskexit() shouldn't use switchmmirqs_off().
• scsiscan: Exit loop if TUR to LUN0 fails with 0x05/0x25 (bsc#1063043). This is specific to FUJITSU ETERNUSDX* targets. They can return 'Illegal Request - Logical unit not supported' and processing should leave the timeout loop in this case.
• scsi: zfcp: fix erp_action use-before-initialize in REC action trace (bnc#1066973, LTC#160081).
• sunrpc: add authunix hashcred() function (bsc#1012917).
• sunrpc: add genericauth hashcred() function (bsc#1012917).
• sunrpc: add hashcred() function to rpcauthops struct (bsc#1012917).
• sunrpc: add RPCSECGSS hashcred() function (bsc#1012917).
• sunrpc: replace generic auth_cred hash with auth-specific function (bsc#1012917).
• sunrpc: use supplimental groups in auth hash (bsc#1012917).
• temporary fix (bsc#1068032).
• udf: prevent speculative execution (bnc#1068032).
• usb: host: fix incorrect updating of offset (bsc#1047487).
• usb-serial: check for NULL private data in pl2303susedisconnect (bsc#1064803).
• usb: uas: fix bug in handling of alternate settings (bsc#1071074).
• uvcvideo: prevent speculative execution (bnc#1068032).
• video: udlfb: Fix read EDID timeout (bsc#1045538).
• watchdog: hpwdt: add support for iLO5 (bsc#1024612).
• watchdog/hpwdt: Check source of NMI (bsc#1024612).
• x86-64: Give vvars their own page.
• x86-64: Map the HPET NX.
• x86/acpi: Handle SCI interrupts above legacy space gracefully (bsc#1068984).
• x86/acpi: Reduce code duplication in mpoverridelegacy_irq() (bsc#1068984).
• x86/alternatives: Add instruction padding.
• x86/alternatives: Cleanup DPRINTK macro.
• x86/alternatives: Make JMPs more robust.
• x86/alternatives: Use optimized NOPs for padding.
• x86/boot: Add early cmdline parsing for options with arguments.
• x86, boot: Carve out early cmdline parsing function.
• 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 (bsc#1068032).
• x86/CPU: Check speculation control CPUID bit (bsc#1068032).
• x86/cpu: Fix bootup crashes by sanitizing the argument of the 'clearcpuid=' command-line option (bsc#1065600).
• 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 (bsc#1068032).
• 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 (bsc#1068032).
• x86/idle: Toggle IBRS when going idle (bsc#1068032).
• x86/kaiser: Check boottime cmdline params.
• x86/kaiser: disable vmstat accounting.
• x86/kaiser: Move feature detection up (bsc#1068032).
• x86/kaiser: propagate info to /proc/cpuinfo.
• x86/kaiser: Rename and simplify X86FEATUREKAISER handling.
• x86/kvm: Add MSRIA32SPECCTRL and MSRIA32PREDCMD to kvm (bsc#1068032).
• 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: Make alternative instruction pointers relative.
• x86/microcode/AMD: Add support for fam17h microcode loading (bsc#1068032).
• x86/microcode/intel: Disable late loading on model 79 (bsc#1054305).
• x86/mm/64: Fix reboot interaction with CR4.PCIDE.
• x86/mm: Add a 'noinvpcid' boot option to turn off INVPCID.
• x86/mm: Add INVPCID helpers.
• x86/mm: Add the 'nopcid' boot option to turn off PCID.
• x86/mm: Build arch/x86/mm/tlb.c even on !SMP.
• x86/mm: Disable PCID on 32-bit kernels.
• x86/mm: Enable CR4.PCIDE on supported systems.
• x86/mm: fix bad backport to disable PCID on Xen.
• x86/mm: Fix INVPCID asm constraint.
• x86/mm: If INVPCID is available, use it to flush global mappings.
• x86/mm/kaiser: re-enable vsyscalls.
• x86/mm: Only set IBPB when the new thread cannot ptrace current thread (bsc#1068032).
• x86/mm: Remove the UP asm/tlbflush.h code, always use the (formerly) SMP code.
• x86/mm, sched/core: Turn off IRQs in switch_mm().
• x86/mm, sched/core: Uninline switch_mm().
• x86/mm: Set IBPB upon context switch (bsc#1068032).
• x86/MSR: Move native_*msr(.. u64) to msr.h (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 (bsc#1068032).
• x86/spec_ctrl: Check whether IBRS is enabled before using it (bsc#1068032).
• 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).
• xen/kaiser: add 'nokaiser' boot option, using ALTERNATIVE.
• xen/KAISER: Kernel Address Isolation.
• xen/kaiser: use ALTERNATIVE instead of x86cr3pcid_noflush.
• xen/kaiser: work around kABI.
• xen/x86-64: Give vvars their own page.
• xen/x86-64: Map the HPET NX.
• xen/x86/alternatives: Add instruction padding.
• xen/x86/kaiser: Rename and simplify X86FEATUREKAISER handling.
• xen/x86/mm: Enable CR4.PCIDE on supported systems.
• xen/x86/mm/kaiser: re-enable vsyscalls.
• xen/x86/mm: Remove the UP asm/tlbflush.h code, always use the (formerly) SMP code.
• xen: x86/mm, sched/core: Turn off IRQs in switch_mm().
• xen: x86/mm, sched/core: Uninline switch_mm().
• zd1211rw: fix NULL-deref at probe (bsc#1045479).