Rhel 8.2 download

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The fapolicyd packages that provide RHEL application whitelisting have been upgraded to upstream version 0. Notable bug fixes and enhancements include:. Additional mount options are specified in the tmpfs 5 man page. This makes it easier to set up an account lockout on authentication failures, provide user profiles for this functionality, and handle different PAM configurations by simply editing the faillock. User-space applications can now retrieve the netns id selected by the kernel.

User-space applications can request the kernel to select a new netns ID and assign it to a network name space. The kernel then sends the netlink message back to the user. This message includes the netns ID set to the value the kernel selected. As a result, user-space applications now have a reliable option to identify the netlink ID the kernel selected. The firewalld packages have been updated to version 0.

As a result, a message can be sent to addresses other than just the link-local address. With this enhancement, the nftables packet-filtering framework supports set types with concatenations and intervals. As a result, administrators no longer require workarounds to create multi-dimensional IP set types. The nftables packages have been upgraded to upstream version 0. For further information about notable changes, read the upstream release notes before updating:.

Rules for the firewalld service can now use connection tracking helpers for services running on a non-standard port. User-defined helpers in the firewalld service can now use standard kernel helper modules. This enables administrators to create firewalld rules to use connection tracking helpers for services running on a non-standard port.

With this enhancement, the whois package is now available in RHEL 8. As a result, retrieving information about a specific domain name or IP address is now possible.

The Traffic Control tc kernel subsystem and the tc tool can attach extended Berkeley Packet Filtering eBPF programs as packet classifiers and actions for both ingress and egress queueing disciplines. This enables programmable packet processing inside the kernel network data path. The Extended Berkeley Packet Filter eBPF is an in-kernel virtual machine that allows code execution in the kernel space, in the restricted sandbox environment with access to a limited set of functions.

The virtual machine executes a special assembly-like code. The eBPF bytecode first loads to the kernel, followed by its verification, code translation to the native machine code with just-in-time compilation, and then the virtual machine executes the code. Red Hat ships numerous components that utilize the eBPF virtual machine. Each component is in a different development phase, and thus not all components are currently fully supported. All other eBPF components are available as Technology Preview, unless a specific component is indicated as supported.

For more information regarding the Technology Preview components, see Technology Previews. Control Group v2 mechanism is a unified hierarchy control group. Control Group v2 organizes processes hierarchically and distributes system resources along the hierarchy in a controlled and configurable manner.

Unlike the previous version, Control Group v2 has only a single hierarchy. This single hierarchy enables the Linux kernel to:. Control Group v2 supports numerous controllers. Some of the examples are:. This controller implements:. Memory controller regulates the memory distribution.

Currently, the following types of memory usages are tracked:. The information above was based on Control Group v2 upstream documentation. You can refer to the same link to obtain more information about particular Control Group v2 controllers. Be warned that not all features mentioned in the upstream document are implemented yet in RHEL 8. Randomizing free lists: Improved performance and utilization of direct-mapped memory-side-cache.

With this enhancement, you can enable page allocator to randomize free lists and improve the average utilization of a direct-mapped memory-side-cache. As a result, persistent memory with a higher capacity and lower bandwidth is available on general purpose server platforms. The tpm2-tools userspace tool has been updated to version 3. This update provides several bug fixes, in particular relating to Platform Configuration Register code and manual page clean ups.

With this update, the perf tool now provides support for per-die event counts aggregation for some Intel CPUs with multiple dies. As a result, this update detects any imbalance between the dies. The perf stat command captures the event counts and displays the output as:. As a result, the crash kernel is able to automatically reserve memory for kdump on systems with less than 4GB RAM.

The numactl manual entry clarifies the memory usage output. With this release of RHEL 8, the manual page for numactl explicitly mentions that the memory usage information reflects only the resident pages on the system. The reason for this addition is to eliminate potential confusion for users whether the memory usage information relates to resident pages or virtual memory.

The kexec-tools document is now updated to include Kdump FCoE target support. As a result, users can now have better understanding of the status and details of the kdump crash dumping mechanism on a FCoE target support.

Firmware-assisted dump fadump mechanism is now supported on the PowerNV platform. At the time of system failure, fadump , along with the vmcore file, also exports the opalcore file. The opalcore file is helpful in debugging crashes of OPAL-based systems. The kernel-rt sources have been updated to use the latest RHEL kernel source tree.

The realtime patch set has also been updated to the latest upstream v5. Both of these updates provide a number of bug fixes and enhancements. With this update, rngd is able to run with non-root user privileges to enhance system security. When running a RHEL 8. With vPMEM, data persists across application and partition restarts until the physical server is turned off. As a result, restarting workloads that use vPMEM is significantly faster.

For details, see the following Knowledgebase articles:. LVM now supports the dm-writecache caching method. LVM cache volumes now provide the dm-writecache caching method in addition to the existing dm-cache method.

To configure the caching method, use the --type cache or --type writecache option with the lvconvert utility. For more information, see Enabling caching to improve logical volume performance. If the system unexpectedly halts while VDO is writing data in async mode, the recovered data is now always consistent. Due to the ACID compliance, the performance of async is now lower compared to the previous release. To restore the original performance, you can change the write mode on your VDO volume to async-unsafe mode, which is not ACID compliant.

For more information, see Selecting a VDO write mode. The vdo utility now enables you to import existing VDO volumes that are currently not registered on your system. To import a VDO volume, use the vdo import command. New per-op error counter is now available in the output of the mountstats and nfsiostat. A minor supportability feature is available for the NFS client systems: the output of the mountstats and nfsiostat commands in nfs-utils have a per-op error count. This enhancement allows these tools to display per-op error counts and percentages that can assist in narrowing down problems on specific NFS mount points on an NFS client machine.

Note that these new statistics depend on kernel changes that are inside the Red Hat Enterprise Linux 8. In general, cgroup writeback requires explicit support from the underlying file system.

Support for per-op statistics is now available for the mountstats and nfsiostat commands. With this update, under each per-op statistics row, the ninth number indicates the number of the operations that have been completed with a status value less then zero.

This status value indicates an error. For more information, see the updates to the mountstats and nfsiostat programs in the nfs-utils that displays these new error counts. A support feature is available for NFSv4. With this enhancement, you can surprise remove NVMe devices from the Linux operating system without notifying the operating system beforehand. This will enhance the serviceability of NVMe devices because no additional steps are required to prepare the devices for orderly removal, which ensures the availability of servers by eliminating server downtime.

New command options to disable a resource only if this would not affect other resources. It is sometimes necessary to disable resources only if this would not have an effect on other resources. Ensuring that this would be the case can be impossible to do by hand when complex resource relations are set up. To address this need, the pcs resource disable command now supports the following options:. In addition, the pcs resource safe-disable command has been introduced as an alias for pcs resource disable --safe.

The new pcs resource relations command allows you to display the relations between cluster resources in a tree structure. New command to display the status of both a primary site and recovery site cluster. If you have configured a cluster to use as a recovery site, you can now configure that cluster as a recovery site cluster with the pcs dr command.

You can then use the pcs dr command to display the status of both your primary site cluster and your recovery site cluster from a single node.

Expired resource constraints are now hidden by default when listing constraints. Listing resource constraints no longer by default displays expired constraints. To include expired constaints, use the --all option of the pcs constraint command.

This will list expired constraints, noting the constraints and their associated rules as expired in the display. Pacemaker support for configuring resources to remain stopped on clean node shutdown. Some users prefer to have high availability only for failures, and to treat clean shutdowns as scheduled outages. To address this, Pacemaker now supports the shutdown-lock and shutdown-lock-limit cluster properties to specify that resources active on a node when it shuts down should remain stopped until the node next rejoins.

Users can now use clean shutdowns as scheduled outages without any manual intervention. For information on configuring resources to remain stopped on a clean node shutdown, see link: Configuring resources to remain stopped on clean node shutdown. A cluster with only one member configured is now able to start and run resources in a cluster environment.

This allows a user to configure a separate disaster recovery site for a multi-node cluster that uses a single node for backup. Note that a cluster with only one node is not in itself fault tolerant. Python 3. To install packages from the python38 module, use, for example:. See Using Python for more information. Note that Red Hat will continue to provide support for Python 3. This change introduced a dependency known issue described in BZ Support for hardware-accelerated deflate in zlib on IBM Z.

This update adds support for a hardware-accelerated deflate algorithm to the zlib library in the IBM Z mainframes. As a result, performance of compression and decompression on IBM Z vector machines has been improved. As a result, performance of decompressing gzip files has been improved. This version of the Maven software project management and comprehension tool provides numerous bug fixes and various enhancements over the maven If you want to upgrade from the maven The original ACMEv1 protocol remains supported but is deprecated by popular service providers.

The php The rrd extension provides bindings to the RRDtool C library. RRDtool is a high performance data logging and graphing system for time series data. The Xdebug extension is included to assist you with debugging and development.

Note that the extension is provided only for development purposes and should not be used in production environments. BZ , BZ The sscg utility is now able to generate private key files protected by a password. The grafana package has been upgraded to version 6. The pcp package has been upgraded to version 5.

The grafana-pcp package provides new grafana data sources and application plugins connecting PCP with grafana. With the grafana-pcp package, you can analyze historical PCP metrics and real-time PCP metrics using the pmseries query language and pmwebapi live services respectively. GCC Toolset 9 is a compiler toolset that provides recent versions of development tools. The GCC Toolset 9 components are now available in the two container images:.

To run a shell session where tool versions from GCC Toolset 9 take precedence over system versions of these tools:. The system GCC compiler, version 8. A new tunable for changing the maximum fastbin size in glibc. The malloc function uses a series of fastbins that hold reusable memory chunks up to a specific size.

The default maximum chunk size is 80 bytes on bit systems and bytes on bit systems. This enhancement introduces a new glibc. The glibc. With this update, the upper limit of the glibc. The glibc dynamic loader is enhanced to provide a non-inheriting library preloading mechanism. With this enhancement, the loader can now be invoked to load a user program with a --preload option followed by a colon-separated list of libraries to preload. This feature allows users to invoke their programs directly through the loader with a non-inheriting library preload list.

The elfutils package has been upgraded to version 0. The SystemTap instrumentation tool has been updated to version 4. This allows monitoring of additional subsystems on IBM Z series machines. To install the rust-toolset module, run the following command as root:.

For usage information, see Using Rust Toolset. LLVM Toolset has been upgraded to version 9. With this update, the asm goto statements are now supported. To install the llvm-toolset module, run the following command as root:. To install the go-toolset module, run the following command as root:. To debug a helloworld. For more information on Delve, see the upstream Delve documentation. This update introduces several ansible-freeipa modules for automating common Identity Management IdM tasks using Ansible playbooks:.

Note that you can combine two or more ipauser calls into one with the users variable or, alternatively, use a JSON file containing the users. Similarly, you can combine two or more ipahost calls into one with the hosts variable or, alternatively, use a JSON file containing the hosts. The ipahost module can also ensure the presence or absence of several IPv4 and IPv6 addresses for a host.

The test ensures that the expected DNS records required for autodiscovery are resolvable. The SMB1 protocol has been disabled in the Samba server and client utilities by default. In Samba 4. Red Hat recommends to not use the SMB1 protocol. However, if your environment requires SMB1, you can manually re-enable the protocol. To re-enable SMB1 for Samba client utilities and the libsmbclient library:. The samba packages have been upgraded to upstream version 4.

Samba automatically updates its tdb database files when the smbd , nmbd , or winbind service starts. Back up the database files before starting Samba.

Note that Red Hat does not support downgrading tdb database files. The ds-base packages have been upgraded to upstream version 1. For a complete list of notable changes, read the upstream release notes before updating:.

This enhancement provides replacements for the unsupported dbverify , validate-syntax. These scripts have been replaced with the following commands:. For a list of all legacy scripts and their replacements, see Command-line utilities replaced in Red Hat Directory Server A hidden replica is an IdM server that has all services running and available.

Therefore, clients cannot use service discovery to detect hidden replicas. Hidden replicas are primarily designed for dedicated services that can otherwise disrupt clients.

For example, a full backup of IdM requires to shut down all IdM services on the master or replica. Since no clients use a hidden replica, administrators can temporarily shut down the services on this host without affecting any clients. To install a new hidden replica, use the ipa-replica-install --hidden-replica command. To change the state of an existing replica, use the ipa server-state command.

For further details, see Installing an IdM hidden replica. Authentication indicators are attached to Kerberos tickets based on which pre-authentication mechanism has been used to acquire the ticket:. The Kerberos Distribution Center KDC can enforce policies such as service access control, maximum ticket lifetime, and maximum renewable age, on the service ticket requests which are based on the authentication indicators.

The krb5 package is now FIPS-compliant. With this enhancement, non-compliant cryptography is prohibited. Directory Server sets the sslVersionMin parameter based on the system-wide crypto policy.

By default, Directory Server now sets the value of the sslVersionMin parameter based on the system-wide crypto policy. Alternatively, you can manually set sslVersionMin to higher value than the one defined in the crypto policy:.

Note that the nouveau graphics driver does not yet support 3D acceleration with the Nvidia Turing TU family. Administrators can now use client certificates to authenticate to the RHEL 8 web console. With this web console enhancement, a system administrator can use client certificates to access a RHEL 8 system locally or remotely using a browser with certificate authentication built in.

No additional client software is required. These certificates are commonly provided by a smart card or Yubikey, or can be imported into the browser. When logging in with a certificate, the user cannot currently perform administrative actions in the web console.

But the user can perform them on the Terminal page with the sudo command after authenticating with a password. With this update, it is possible to configure the web console to log in with a TLS client certificate that is provided by a browser or a device such as a smart card or a YubiKey. The new design provides better accessibility and matches the design of OpenShift 4.

Updates include:. For more information about PatternFly, see the PatternFly project page. Additionally, the Virtual Machines page now supports the creation and removal of virtual network interfaces.

Usability testing showed that the default mount point concept on the RHEL web console Storage page was hard to grasp, and led to a lot of confusion. With this update, the web console no longer offers a Default choice when mounting a file system.

Creating a new file system now always requires a specified mount point. Changes made in the web console always apply to both the configuration and the run-time state. When the configuration and the run-time state differ from each other, the web console shows a warning, and enable users to easily bring them back in sync. Attempting to create a RHEL virtual machine from an install tree now returns a more helpful error message. This update adds a virt-install error message that provides instructions on how to work around this problem.

EDK2 rebased to version stable The EDK2 package has been upgraded to version stable , which provides multiple enhancements. The default registries. When using short names, there is always an inherent risk of spoofing For example, a user wants to pull an image named foobar from a registry and expects it to come from myregistry.

If myregistry. The user would accidentally pull and run the attacker image and code rather than the intended content. Red Hat recommends only adding registries which are trusted, that is registries which do not allow unknown or anonymous users to create accounts with arbitrary names.

This prevents an image from being spoofed, squatted or otherwise made insecure. Podman no longer depends on oci-systemd-hook. Podman does not need or depend on the oci-systemd-hook package which has been removed from the container-tools:rhel8 and container-tools This chapter provides system administrators with a summary of significant changes in the kernel distributed with Red Hat Enterprise Linux 8.

These changes include added or updated proc entries, sysctl , and sysfs default values, boot parameters, kernel configuration options, or any noticeable behavior changes. This is a debugging parameter for setting a timeout in seconds for the deferred probe to give up waiting on dependencies to probe. Only specific dependencies subsystems or drivers that have opted in will be ignored. A timeout of 0 will timeout at the end of initcalls.

This parameter will also dump out devices still on the deferred probe list after retrying. If the software workaround is enabled for the host, guests do not need to enable it for nested guests. Boolean flag to control whether the page allocator should randomize its free lists. The randomization may be automatically enabled if the kernel detects it is running on a platform with a direct-mapped memory-side cache.

For details see the upstream kernel documentation. The exploit is able to forward information to a disclosure gadget under certain conditions. In vulnerable processors, the speculatively forwarded data can be used in a cache side channel attack, to access data to which the attacker does not have direct access.

This isolation is the best effort and is only effective if the automatically assigned interrupt mask of a device queue contains isolated and housekeeping CPUs. For details on when the memory encryption can be activated, see the upstream kernel documentation. This improves system performance, but it may also expose users to several CPU vulnerabilities. This does not have any effect on kvm. This option is for users who always want to be fully mitigated, even if it means losing SMT.

If not specified, the kernel will calculate a value based on the most recent settings of the rcutree. This calculated value may be viewed in the rcutree.

Any attempt to set rcutree. If your platform meets the requirements for EAS but you do not want to use it, change this value to 0. This parameter controls the maximum number of threads the fork function can create. The minimum value that can be written to threads-max is 1. BPF is a flexible and efficient infrastructure allowing to execute bytecode at various hook points.

It is used in a number of Linux kernel subsystems such as networking for example XDP , tc , tracing for example kprobes , uprobes , tracepoints and security for example seccomp. This chapter provides a comprehensive listing of all device drivers that are new or have been updated in Red Hat Enterprise Linux 8.

This part describes bugs fixed in Red Hat Enterprise Linux 8. Using the version or inst. Previously, booting the installation program from the kernel command line using the version or inst. With this update, the version and inst. Previously, RHEL 8. The capabilities of the server and hypervisor used during installation determined if the resulting on-disk format contained secure boot support.

There was no way to influence the on-disk format during installation. Consequently, if you installed RHEL 8. With this update, you can now configure the secure boot option of the zipl tool. To do so, you can use either:. With this update, unless previously configured, the default value is set to auto , and the secure boot feature is now available.

However, the new-kernel-pkg script is not included in a RHEL 8 system. The installation does not set more than the maximum number of allowed devices in the boot-device NVRAM variable. As a result, the installation failed on systems that had more than the maximum number of devices.

With this update, the RHEL 8 installation program now checks the maximum device setting and only adds the permitted number of devices. Installations work for an image location that uses a URL command in a Kickstart file located in a non-network location. Previously, the installation failed early in the process when network activation triggered by the image remote location was specified by a URL command in a Kickstart file located in a non-network location. This update fixes the issue, and installations that provide the image location by using a URL command in a Kickstart file that is located in a non-network location, for example, a CD-ROM or local block device, now work as expected.

Previously, when checking for unformatted devices, the installation program checked all DASD devices. This setting forced the yum repolist command to end on first unavailable repository with an error and exit status 1.

Consequently, yum repolist did not continue listing available repositories. With this update, yum repolist has been fixed to no longer require any downloads.

As a result, yum repolist does not provide any output requiring metadata, and the command now continues listing available repositories as expected. Note that the number of available packages is only returned by yum repolist --verbose or yum repoinfo that still require available metadata.

Therefore these commands will end on the first unavailable repository. The build directory handling has been changed. Previously, the build directory was kept in a temporary location in case ReaR encountered a failure. With this update, the build directory is deleted by default in non-interactive runs to prevent consuming disk space. The default value is an empty string with the meaning of errors when ReaR is being executed interactively in a terminal and false if ReaR is being executed non-interactively.

Previously, reindexing of the file database was not performed automatically, because the mlocate-updatedb. With this update, the mlocate-updatedb. As a result, the file database is updated automatically. Previously, dnsmasq forwarded all the non-recursive queries to an upstream server, which led to different responses. As a result, the same response as to recursive queries to known names is returned.

Previously, if the system time changed, the system could lose the IP address assigned due to the removal by the kernel. As a result, the system no longer loses the IP address in the described scenario.

This update fixes the ipcalc utility to follow the RFC standard properly. As a consequence, the DNS resolver did not search host names in the current and parent domains with the following postfix configuration:. In RHEL 8, the postfix package has been split into multiple subpackages, each subpackage providing a plug-in for a specific database. Previously, RPM packages containing the postfix-pcre , postfix-cdb , and postfix-sqlite plug-ins were not distributed. Consequently, databases with these plug-ins could not be used with Postfix.

As a result, these plug-ins can be used after the appropriate RPM package is installed. When an update replaces the binary of a running application, the kernel modifies the application binary path in memory by appending the " deleted " suffix. Previously, the fapolicyd file access policy daemon treated such applications as untrusted, and prevented them from opening and executing any other files. As a consequence, the system was sometimes unable to boot after applying updates.

With the release of the RHBA advisory, fapolicyd ignores the suffix in the binary path so the binary can match the trust database.

As a result, fapolicyd enforces the rules correctly and the update process can finish. Previously, the openssl-pkcs11 engine attempted to log in to the first result of a search using the provided PKCS 11 URI and used the provided PIN even if the first result was not the intended device and the PIN matched another device. These failed authentication attempts locked the device. The engine now intentionally fails in case the PKCS 11 search finds more than one device.

OpenSCAP offline scans using rpmverifyfile now work properly. Prior to this update, the OpenSCAP scanner did not correctly change the current working directory in offline mode, and the fchdir function was not called with the correct arguments in the OpenSCAP rpmverifyfile probe.

The OpenSCAP scanner has been fixed to correctly change the current working directory in offline mode, and the fchdir function has been fixed to use correct arguments in rpmverifyfile. For this reason, a PKCS 11 device stores public-key information in a separate object whether it is a public-key object or a certificate object. This problem has been solved by loading the EC public key from the certificate if the public-key object is not available. Previously, the scap-security-guide package contained a combination of remediation and a check that could result in one of the following scenarios:.

Consequently, during the RHEL installation process, scanning of the installed system reported some Audit rules as either failed or errored. With this update, the remediations have been fixed, and scanning of the system installed with the PCI-DSS security policy no longer reports false positives for Audit rules. OpenSCAP now provides offline scanning of virtual machines and containers. Consequently, the following tools could not be included in the openscap-utils package: oscap-vm and oscap-chroot.

Furthermore, the openscap-containers package was completely removed from RHEL 8. With this update, the problems in the probes have been fixed.

As a result, RHEL 8 now contains the oscap-podman , oscap-vm , and oscap-chroot tools in the openscap-utils package. OpenSCAP rpmverifypackage now works correctly. Previously, the chdir and chroot system calls were called twice by the rpmverifypackage probe.

The rpmverifypackage probe has been fixed to properly utilize the chdir and chroot system calls. As a result, rpmverifypackage now works correctly. As a consequence, sometimes kernel was getting terminated unexpectedly.

As a result, kernel no longer crashes in the described scenario. FirewallD1 returned an error message: org. Exception: list index out of range due to bad indexing. RHEL no longer logs a kernel warning when unloading the ipvs module.

Previously, the IP virtual server ipvs module used an incorrect reference counting, which caused a race condition when unloading the module. Consequently, RHEL logged a kernel warning. This update fixes the race condition. As a result, the kernel no longer logs the warning when you unload the ipvs module.

The nft utility no longer interprets arguments as command-line options after the first non-option argument. Previously, the nft utility accepted options anywhere in an nft command.

For example, admins could use options between or after non-option arguments. As a consequence, due to the leading dash, nft interpreted negative priority values as options, and the command failed. As a result, admins no longer require workarounds to pass negative priority values to nft. Note that due to this change, you must now pass all command-options to nft before the first non-option argument.

Before you update, verify your nftables scripts to match this new criteria to ensure that the script works as expected after you installed this update. A configuration parameter has been added to firewalld to disable zone drifting. Previously, the firewalld service contained an undocumented behavior known as "zone drifting".

As a consequence, on hosts that used this behavior to configure a catch-all or fallback zone, firewalld denied connections that were previously allowed. This update re-adds the zone drifting behavior, but as a configurable feature.

As a result, users can now decide to use zone drifting or disable the behavior for a more secure firewall setup. By default, in RHEL 8. Note that, if the parameter is enabled, firewalld logs:. However, as the Linux hotplug subsystem uses a memory size of MiB, hot-plugging new devices caused multiple memory regions to overlap in a single hotplug memory window. Consequently, this caused failure in listing the available persistent memory namespaces with the following or a similar call trace:.

This update fixes the problem and supports Linux hotplug subsystem to enable multiple memory regions to share a single hotplug memory window. Previously, when encountering a data corruption, a simple WARN was generated, which was likely to go unnoticed. This prevents further damage and reduces the security risk.

The kdump now generates a vmcore , which improves the data corruption bug reporting. Consequently, this could cause an unexpected latency spike in a real-time environment when a latency-sensitive workload was using the same CPU where RPS or XPS jobs were running. Note that a networking workload in an environment with isolated CPUs is likely to experience some performance variation.

In certain cases, such as vPort creation on a Fibre Channel host bus adapter HBA , the memory usage was excessive, depending upon the system configuration.

The increased memory usage was caused by memory preallocation in the block layer. With this update, the block layer limits the amount of memory preallocation, and as a result, the SCSI drivers no longer use an excessive amount of memory. Previously, the dmsetup suspend command became unresponsive if you attempted to suspend a VDO volume while the UDS index was rebuilding. The command finished only after the rebuild. With this update, the problem has been fixed. The dmsetup suspend command can finish before the UDS rebuild is done without becoming unresponsive.

Unrelocated and uninitialized shared objects no longer result in failures if dlopen fails. Consequently, the unrelocated and uninitialized shared objects remained in the process image, eventually resulting in assertion failures or crashes. As a result, the process does not leave any unrelocated objects behind. Also, lazy binding failures while ELF constructors and destructors run now terminate the process. As a consequence, binaries could misbehave at runtime. The sudo wrapper script now parses options.

As a consequence, some sudo options for example, sudo -i could not be executed. Alignment of TLS variables in glibc has been fixed. Previously, aligned thread-local storage TLS data could, under certain conditions, become instantiated without the expected alignment. As a result, aligned TLS data is now correctly instantiated for all threads with the correct alignment. Previously in this situation, if pututxline was called immediately again and managed to obtain the lock, it did not use an already-allocated matching slot in the utmp file, but added another entry instead.

As a consequence, these unused entries increased the size of the utmp file substantially. This update fixes the issue, and the entries are added to the utmp file correctly now. Previously, a defect in the mtrace tool implementation could cause memory tracing to hang. To fix this issue, the mtrace memory tracing implementation has been made more robust to avoid the hang even in the face of internal failures. As a result, users can now call mtrace and it no longer hangs, completing in bounded time.

Previously, if a program registered an atfork handler and invoked fork from an asynchronous-signal handler, a defect in the internal implementation-dependent lock could cause the program to freeze. With this update, the implementation of fork and its atfork handlers is adjusted to avoid the deadlock in single-threaded programs.

On certain IBM Z platforms z15, previously known as arch13 , the strstr function did not correctly update a CPU register when handling search patterns that cross a page boundary.

As a consequence, strstr returned incorrect matches. This update fixes the problem, and as a result, strstr works as expected in the mentioned scenario. UTF-8 locale source ellipsis expressions in glibc are fixed.

Previously, a defect in the C. The C. UTF-8 source locale has been corrected, and the newly compiled binary locale now has collation weights for all Unicode code points.

The compiled C. UTF-8 locale is 5. When you called the endpwent function, further calls to getpwent without first calling setpwent caused glibc to fail because endpwent could not reset the internals to allow a new query.

This update fixes the problem. As a result, after you end one query with endpwent , further calls to getpwent will start a new query even if you do not call setpwent. Previously, ltrace did not produce any results on certain hardened binaries, such as system binaries, on the AMD and Intel bit architectures.

With this update, ltrace can now trace system calls in hardened binaries. Consequently, the affected CPUs might not execute programs properly. The full fix involves updating the microcode of vulnerable CPUs, which can cause a performance degradation. This update enables a workaround in the assembler that helps to reduce the performance loss. The workaround is not enabled by default. To apply the workaround, recompile a program using GCC with the -Wa,-mbranches-withinB-boundaries command-line option.

A program recompiled with this command-line option will not be affected by the JCC flaw, but the microcode update is still necessary to fully protect a system. Note that applying the workaround will increase the size of the program and can still cause a slight performance decrease, although it should be less than it would have been without the recompilation. Previously, while running parallel builds, make sub-processes could become temporarily unresponsive when waiting for their turn to run.

As a consequence, builds with high -j values slowed down or ran at lower effective -j values. With this update, the job control logic of make is now non-blocking. As a result, builds with high -j values run at full -j speed. The ltrace tool now reports function calls correctly. Because of improvements to binary hardening applied to all RHEL components, the ltrace tool previously could not detect function calls in binary files coming from RHEL components.

As a consequence, ltrace output was empty because it did not report any detected calls when used on such binary files. This update fixes the way ltrace handles function calls, which prevents the described problem from occurring. The dsctl utility no longer fails to manage instances with a hyphen in their name. Previously, the dsctl utility did not correctly parse hyphens in the Directory Server instance names. As a consequence, administrators could not use dsctl to manage instances with a hyphen in their name.

This update fixes the problem, and dsctl now works as expected in the mentioned scenario. When an LDAP client establishes a connection to Directory Server, the server stores information related to the client address in a local buffer. Previously, the size of this buffer was too small to store an LDAPI path name longer than 46 characters. For example, this is the case if name of the Directory Server instance is too long. As a consequence, the server terminated unexpectedly due to an buffer overflow.

As a result, Directory Server no longer crashes in the mentioned scenario. Note that due to the limitation in the NSPR library, an instance name can be maximum characters. The pkidestroy utility now picks the correct instance. Previously, the pkidestroy --force command executed on a half-removed instance picked the pki-tomcat instance by default, regardless of the instance name specified with the -i instance option.

This means that the SSSD access control is always called. You should be aware of this change when designing access control rules for RHEL 8 systems. For example, you can add the systemd-user service to the allowed services list.

The sssd-ldap man page has been updated to include this information. Entering the ipa dns-update-system-records --dry-run command manually was necesary to obtain a list of all DNS records required by IdM. With this update, the ipa-adtrust-install command correctly lists the DNS service records for manual addition to the DNS zone.

Starting a VM on a 10th generation Intel Core processor no longer fails. Previously, starting a virtual machine VM failed on a host model that used a 10th generation Intel Core processor, also known as Icelake-Server. As a result, starting a VM on a host model running a 10th generation Intel processor no longer fails. Using cloud-init to provision virtual machines on Microsoft Azure now works correctly.

Previously, when using a RHEL 8 virtual machine VM running on a RHEL 7 host system, certain methods of displaying the the graphical output of the VM, such as running the application in kiosk mode, could not use greater resolution than x As a consequence, displaying VMs using those methods only worked in resolutions up to x even if the host hardware supported higher resolutions.

Pulling images from the quay. Previously, having the quay. To fix this issue, the quay. As a result, pulling images from the quay. The quay. Nmstate is a network API for hosts. The nmstate packages, available as a Technology Preview, provide a library and the nmstatectl command-line utility to manage host network settings in a declarative manner.

The networking state is described by a pre-defined schema. Reporting of the current state and changes to the desired state both conform to the schema. It accompanies XDP and grants efficient redirection of programmatically selected packets to user space applications for further processing. XDP available as a Technology Preview. The eXpress Data Path XDP feature, which is available as a Technology Preview, provides a means to attach extended Berkeley Packet Filter eBPF programs for high-performance packet processing at an early point in the kernel ingress data path, allowing efficient programmable packet analysis, filtering, and manipulation.

The dracut utility now supports creating initrd images with NetworkManager support as a technology preview. By default, the dracut utility uses a shell script to manage networking in the initial RAM disk initrd. In certain cases, this could cause problems when the system switches from the RAM disk to the operating system that uses NetworkManager to configure the network. This request from the RAM disk could result in a time out.

To solve these kind of problems, dracut in RHEL 8. Use the following commands to enable the feature and recreate the RAM disk images:. Note that Red Hat does not support technology preview features.

However, to provide feedback about this feature, please contact the Red Hat support. Note that Red Hat provides this feature as an unsupported Technology Preview. The systemd-resolved service is now available as a Technology Preview.

The systemd-resolved service provides name resolution to local applications. Note that, even if the systemd package provides systemd-resolved , this service is an unsupported Technology Preview.

The kexec fast reboot feature, continues to be available as a Technology Preview. Rebooting is now significantly faster thanks to kexec fast reboot. To use this feature, load the kexec kernel manually, and then reboot the operating system. Extended Berkeley Packet Filter eBPF is an in-kernel virtual machine that allows code execution in the kernel space, in the restricted sandbox environment with access to a limited set of functions.

The virtual machine includes a new system call bpf , which supports creating various types of maps, and also allows to load programs in a special assembly-like code. The code is then loaded to the kernel and translated to the native machine code with just-in-time compilation. See the bpf 2 man page for more information. The loaded programs can be attached onto a variety of points sockets, tracepoints, packet reception to receive and process data.

All components are available as a Technology Preview, unless a specific component is indicated as supported. The libbpf package is currently available as a Technology Preview. The igc Intel 2. The ethtool utility also supports igc wired LANs. In Red Hat Enterprise Linux 8. DAX provides a means for an application to directly map persistent memory into its address space.

Also, the file system must be mounted with the dax mount option. OverlayFS is a type of union file system. It enables you to overlay one file system on top of another. Changes are recorded in the upper file system, while the lower file system remains unmodified. This allows multiple users to share a file-system image, such as a container or a DVD-ROM, where the base image is on read-only media.

OverlayFS remains a Technology Preview under most circumstances. As such, the kernel logs warnings when this technology is activated. Full support is available for OverlayFS when used with supported container engines podman , cri-o , or buildah under the following restrictions:.

Test your application thoroughly before deploying it with OverlayFS. These two options make the format of the upper layer incompatible with an overlay without these options. Stratis is a new local storage manager. It provides managed file systems on top of pools of storage with additional features to the user. To administer Stratis storage, use the stratis utility, which communicates with the stratisd background service.

For more information, see the Stratis documentation: Setting up Stratis file systems. The new ipa-client-samba utility provided by the same-named package adds a Samba-specific Kerberos service principal to IdM and prepares the IdM client. As a result, administrators can now set up Samba on an IdM domain member.

For details, see Setting up Samba on an IdM domain member. Pacemaker podman bundles available as a Technology Preview. Pacemaker container bundles now run on the podman container platform, with the container bundle feature being available as a Technology Preview. Heuristics in corosync-qdevice available as a Technology Preview.

Heuristics are a set of commands executed locally on startup, cluster membership change, successful connect to corosync-qnetd , and, optionally, on a periodic basis. When all commands finish successfully on time their return error code is zero , heuristics have passed; otherwise, they have failed.

The heuristics result is sent to corosync-qnetd where it is used in calculations to determine which partition should be quorate. New fence-agents-heuristics-ping fence agent. This agent aims to open a class of experimental fence agents that do no actual fencing by themselves but instead exploit the behavior of fencing levels in a new way. If the heuristics agent is configured on the same fencing level as the fence agent that does the actual fencing but is configured before that agent in sequence, fencing issues an off action on the heuristics agent before it attempts to do so on the agent that does the fencing.

If the heuristics agent gives a negative result for the off action it is already clear that the fencing level is not going to succeed, causing Pacemaker fencing to skip the step of issuing the off action on the agent that does the fencing.

A heuristics agent can exploit this behavior to prevent the agent that does the actual fencing from fencing a node under certain conditions. A user might want to use this agent, especially in a two-node cluster, when it would not make sense for a node to fence the peer if it can know beforehand that it would not be able to take over the services properly.

For example, it might not make sense for a node to take over services if it has problems reaching the networking uplink, making the services unreachable to clients, a situation which a ping to a router might detect in that case. In Red Hat Enterprise Linux 7.

Previously, enhancements could change the behavior of a command in an incompatible way. This enables:. In all cases, the communication with the server is possible, regardless if one side uses, for example, a newer version that introduces new options for a feature.

The cryptographic keys are automatically generated and rotated. This might affect the availability of DNS zones that are not configured in accordance with recommended naming practices. Checking the overall health of your public key infrastructure is now available as a Technology Preview. All the checks provided by pki-healthcheck are also integrated into the ipa-healthcheck tool. This enables administrators to configure and manage servers from a graphical user interface GUI remotely, using the VNC session.

As a consequence, new administration applications are available on the bit ARM architecture. Using Firefox , administrators can connect to the local Cockpit daemon remotely. Software Images icon An illustration of two photographs. Images Donate icon An illustration of a heart shape Donate Ellipses icon An illustration of text ellipses. Metropolitan Museum Cleveland Museum of Art. Internet Arcade Console Living Room. Books to Borrow Open Library. Search the Wayback Machine Search icon An illustration of a magnifying glass.

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