SUSE-SU-2018:0010-1

SUSE-SU-2018:0010-1 · Security update for the Linux Kernel

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The SUSE Linux Enterprise 12 SP3 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 / '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 for available firmware or BIOS updates. 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. 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'. This is only enabled by default on affected architectures. 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 (bnc#1073792). The following non-security bugs were fixed: - Add undefine _unique_build_ids (bsc#964063) - apei / ERST: Fix missing error handling in erst_reader() (bsc#1072556). - arm: Hide finish_arch_post_lock_switch() from modules (bsc#1068032). - autofs: fix careless error in recent commit (bnc#1012382 bsc#1065180). - bnxt_en: Do not print 'Link speed -1 no longer supported' messages (bsc#1070116). - bpf: prevent speculative execution in eBPF interpreter (bnc#1068032). - carl9170: prevent speculative execution (bnc#1068032). - ceph: drop negative child dentries before try pruning inode's alias (bsc#1073525). - 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). - e1000e: Fix e1000_check_for_copper_link_ich8lan return value (bsc#1073809). - 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 (bsc#1073090). - ibmvnic: Include header descriptor support for ARP packets (bsc#1073912). - ibmvnic: Increase maximum number of RX/TX queues (bsc#1073912). - ibmvnic: Rename IBMVNIC_MAX_TX_QUEUES to IBMVNIC_MAX_QUEUES (bsc#1073912). - 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). - 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). - locking/barriers: introduce new memory barrier gmb() (bnc#1068032). - mm/mmu_context, sched/core: Fix mmu_context.h assumption (bsc#1068032). - net/mlx5e: DCBNL, Implement tc with ets type and zero bandwidth (bsc#966170 FATE#320225 bsc#966172 FATE#320226). - net: mpls: prevent speculative execution (bnc#1068032). - nfs: revalidate '.' etc correctly on 'open' (bsc#1068951). - nfs: revalidate '.' etc correctly on 'open' (git-fixes). Fix References: tag. - 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 (bsc#1072890). - 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). - s390: add ppa to system call and program check path (bsc#1068032). - s390: introduce CPU alternatives (bsc#1068032). - s390/qeth: add missing hash table initializations (bnc#1072216, LTC#162173). - s390/qeth: fix early exit from error path (bnc#1072216, LTC#162173). - s390/qeth: fix thinko in IPv4 multicast address tracking (bnc#1072216, LTC#162173). - s390/spinlock: add gmb memory barrier (bsc#1068032). - sched/core: Add switch_mm_irqs_off() and use it in the scheduler (bsc#10

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Publicación

2018-01-04T07:38:09Z

Actualización

2026-02-04T03:57:03.578864Z

Pila tecnológica: system

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