kernel security and bug fix update

[2.6.32-754.12.1.OL6]

• Update genkey [bug 25599697]
  [2.6.32-754.12.1]
• [x86] vDSO: Don’t generate retpoline for indirect call (Waiman Long) [1638552]
• [fs] cifs: fix reparse point/symlink breakage (Leif Sahlberg) [1636484]
• [scsi] qla2xxx: Mask off Scope bits in retry delay (Himanshu Madhani) [1588133]
• [net] tcp: make tcp_retransmit_timer a no-op on empty write queue (Paolo Abeni) [1585892]
• [kernel] sched/sysctl: Check user input value of sysctl_sched_time_avg (Lauro Ramos Venancio) [1579128]
• [fs] Fix up non-directory creation in SGID directories (Miklos Szeredi) [1600951] {CVE-2018-13405}
• [fs] hugetlbfs: switch to inode_init_owner() (Miklos Szeredi) [1600951] {CVE-2018-13405}
• [fs] udf: replace inode uid, gid, mode init with helper (Miklos Szeredi) [1600951] {CVE-2018-13405}
• [fs] ubifs: replace inode uid, gid, mode initialization with helper function (Miklos Szeredi) [1600951] {CVE-2018-13405}
• [fs] ramfs: replace inode uid, gid, mode initialization with helper function (Miklos Szeredi) [1600951] {CVE-2018-13405}
• [fs] ext4: replace inode uid, gid, mode init with helper (Miklos Szeredi) [1600951] {CVE-2018-13405}
• [fs] ext3: replace inode uid, gid, mode init with helper (Miklos Szeredi) [1600951] {CVE-2018-13405}
• [fs] ext2: replace inode uid, gid, mode init with helper (Miklos Szeredi) [1600951] {CVE-2018-13405}
• [fs] btrfs: replace inode uid, gid, mode initialization with helper function (Miklos Szeredi) [1600951] {CVE-2018-13405}
• [fs] vfs: Add inode uid,gid,mode init helper (Miklos Szeredi) [1600951] {CVE-2018-13405}
• [s390] kernel: adapt to changed CPU vulnerabilities function prototypes (Hendrik Brueckner) [1625381]
• [s390] detect etoken facility (Hendrik Brueckner) [1625381]
• [s390] Correct register corruption in critical section cleanup (Hendrik Brueckner) [1625381]
• [s390] remove indirect branch from do_softirq_own_stack (Hendrik Brueckner) [1625381]
• [s390] move spectre sysfs attribute code (Hendrik Brueckner) [1625381]
• [s390] kernel: use expoline for indirect branches (Hendrik Brueckner) [1625381]
• [s390] ftrace: use expoline for indirect branches (Hendrik Brueckner) [1625381]
• [s390] move expoline assembler macros to a header (Hendrik Brueckner) [1625381]
• [s390] correct module section names for expoline code revert (Hendrik Brueckner) [1625381]
• [x86] speculation/l1tf: Fix overflow in l1tf_pfn_limit() on 32bit (Oleksandr Natalenko) [1670328]
• [perf] Fix a race between ring_buffer_detach() and ring_buffer_attach() (Jiri Olsa) [1589340]
• [perf] Fix mmap() accounting hole (Jiri Olsa) [1627672]
• [perf] Fix perf mmap bugs (Jiri Olsa) [1627672]