readykernel-patch-73.24-78.0-1.vl7

Kernel Update Version:
3.10.0-862.20.2.vz7.73.24
Release Date:
2019-05-13 09:03:02
  • VSTOR-22272

    I/O errors were reported after a successful replacement of the ploop images.

  • VSTOR-22414

    'ploop replace' did not clear 'abort' flag.

    It was found that if a ploop image was revoked and then replaced using 'ploop replace', 'abort' flag was not cleared. As a result, subsequent I/O operations would fail.
  • PSBM-93349

    ploop: potential data corruption due to a race between 'prepare_merge' and 'submit_alloc' operations.

  • PSBM-93675

    vzstat shows incorrect per-CT scheduling latency (MLAT).

  • PSBM-93713

    High order page allocations were made in neigh_probe() in certain cases.

  • PSBM-93672

    High order page allocations were triggered by CRIU while restoring TCP sockets.

  • VSTOR-21390

    Network performance issues due to the usage of pfmemalloc reserves.

    It was discovered that network drivers could allocate memory for the socket buffers from pfmemalloc memory reserves, even when it was unnecessary. As a result, the network packets were dropped by sk_filter_trim_cap() causing performance issues.
  • PSBM-93047

    fuse_kio_pcs: kernel crash in process_pcs_init_reply() caused by a double free.

  • PSBM-93052

    skb drops due to the usage of pfmemalloc reserves were difficult to debug.

    Additional diagnostics was introduced to make it easier to detect and analyze skb drops due to the usage of pfmemalloc reserves.
  • PSBM-93016

    KVM did not update CPUID bits OSXSAVE and OSPKE in some cases.

    It was discovered that CPUID bits OSXSAVE and OSPKE were not updated properly by KVM when the guest system rebooted. As a result, the guest system could crash.
  • PSBM-92132

    The per-container limit on the network interfaces was too low for Docker in some cases.

    It was discovered that Docker running inside a Virtuozzo container could hit the limit on the network interfaces (256) when it tried to start 50+ its containers. This fix allows changing that limit for the running containers and increases the default limit to 1024.
  • PSBM-92064

    txqueuelen could not be changed via SIOCSIFTXQLEN ioctl on the host.

  • PSBM-91819

    Kernel crash in ext4_clear_inode().

  • PSBM-91566

    A large tarball with a lot of small files can fail to unpack inside a container if kmem limit is set.

    It was found that unpacking a large tarball with a lot of small files could fail inside a container. This could happen because kmem limit was hit prematurely, while reclaimable memory was still available.
  • PSBM-91598

    sr_mod: kernel crash in sr_block_revalidate_disk().

  • PSBM-91794

    overlayfs: kernel crash in may_open().

    CVE-2019-10140. An attacker with local access can create a denial of service situation via NULL pointer dereference in ovl_posix_acl_create(). The ovl_create() function can return a positive number leading to a null pointer derference of path in may_open(). This can allow attackers with ability to create directories on overlayfs to crash the kernel creating a Denial Of Service (DOS).
  • PSBM-91042

    Links to certain files in /proc/ inside containers were not validated.

    It was discovered that a malicious user inside a Virtuozzo container could potentially overwrite "vzctl" binary on the host. The attacker could replace executables in that container with symlinks to /proc/self/exe. After that, "vzctl exec" called from the host to run one of such executables would try to run the host's "vzctl" there instead. If the attacker managed to intercept that, they would be able to change the contents of the host's "vzctl" binary. The issue is similar to CVE-2019-5736, but affects "vzctl" rather than "runc".
    https://virtuozzosupport.force.com/s/article/000017636
  • PSBM-91361

    Kernel crash (BUG_ON) ploop_relocblks_ioc().

  • PSBM-91032

    /proc/sys/net/core/somaxconn was not available in the containers.

  • CVE-2018-18397

    userfaultfd bypasses tmpfs file permissions.

    A flaw was found in the implementation of userfaultfd. An attacker is able to bypass file permissions on filesystems mounted with tmpfs/hugetlbs to modify a file and possibly disrupt normal system behaviour. At this time there is an understanding there is no crash or priviledge escalation but the impact of modifications on these filesystems of files in production systems may have adverse affects.
    https://bugzilla.redhat.com/show_bug.cgi?id=1641548
  • PSBM-91527

    ipvs: an unneeded debug message is output when a network namespace is initialized.

    Debug message 'IPVS: Creating netns size=... id=...' could be output many times to the system log when the network namespaces are initialized, making the log less readable.
  • PSBM-91181

    'perf record -a' causes segfaults in applications executing vsyscalls.

  • PSBM-90803

    Some operations with ebtables could consume large amounts of memory, resulting in DoS.

    A flaw was found in the implementation of ebtables in the Linux kernel. A local attacker in a container could exploit it to consume large amounts of memory, eventually causing denial of service on the host.
  • PSBM-90329

    Kernel crash (access out of bounds) in SyS_mincore().

  • PSBM-90433

    (enhancement) FUSE: backported immediate-write support for the fast path.