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Jul 04, · – About kexec: To directly boot into a new kernel – It comes from ” kexec-tools ” package. – Path: /sbin/kexec Examples. RPM resource kexec-tools Kexec is a user space utility for loading another kernel and asking the currently running kernel to do something with it. A currently running kernel may be asked to start the loaded kernel on reboot, or to start the loaded kernel after it panics. Updated kexec-tools packages that fix a bug are now available for Red Hat Enterprise Linux 5. The kexec fastboot mechanism allows booting a Linux kernel from the context of an already running kernel. The kexec-tools package provides the /sbin/kexec binary and ancillary utilities that form the user-space component of the kernel’s kexec feature.
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Aug 23, · [root@mytest ~]# rpm -q kexec-tools kexec-toolsel6.x86_64 Read it (vmcore file), but had to download 2 packages: [root@mytest ~]# ls kernel-uek-debuginfo-* This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. publicity relating to this software or products derived from it. This software may be referred to only as “the “the Independent JPEG Group’s software”. We specifically permit and encourage the use of this software as the basis of commercial products, provided that all warranty or liability claims are assumed by the product vendor. *PATCH v4 1/5] RISC-V: Add EM_RISCV to kexec UAPI header [PATCH v4 0/5] RISC-V: Add kexec/kdump support Nick Kossifidis @ ` Nick Kossifidis ` [PATCH v4 2/5] RISC-V: Add kexec support Nick Kossifidis ` (3 subsequent siblings) 4 siblings, 0 replies; 13+ messages in thread From: Nick.
Hide Table of Contents English English. RHSA — Moderate: kexec-tools security, bug fix, and enhancement update. An updated kexec-tools package that fixes three security issues, various bugs, and adds several enhancements is now available for Red Hat Enterprise Linux 6. Common Vulnerability Scoring System CVSS base scores, which give detailed severity ratings, are available for each vulnerability from the CVE links associated with each description below.
This could make it easier for a man-in-the-middle attacker on the local network to impersonate the kdump SSH target server and possibly gain access to sensitive information in the vmcore dumps. A local user could possibly use this flaw to gain access to sensitive information, such as the private SSH key used to authenticate to a remote server when kdump was configured to dump to an SSH target.
This could lead to an information leak when initrd files were previously created with world-readable permissions. Kdump uses kexec to boot to a second kernel, the “dump-capture” or “crash kernel”, when a dump of the system kernel’s memory needs to be taken.
On systems using Extensible Firmware Interface EFI , attempting to boot a second kernel using kdump failed, the dump-capture kernel became unresponsive and the following error message was logged.
The second kernel now boots successfully on EFI machines. To reduce the size of the vmcore dump file, kdump allows you to specify an external application that is, a core collector to compress the data.
The core collector was not enabled by default when dumping to a secure location via SSH. With this update, the default core collector will be makedumpfile when kdump is configured to use SSH. As a result, the vmcore dump file is now compressed by default.
As a consequence, mkdumprd failed to create an initial RAM disk file system initrd for kdump crash recovery and the kdump service failed to start. With this update, mkdumprd has been modified so that it now parses the configuration file and builds initrd correctly. The kdump service now starts as expected. In order for Coverity to scan defects in downstream patches separately, it is necessary to make a clean raw build of the source code without patches.
However, kexec-tools would not build without downstream patches. With this update, by adding a specified patch in kexec-tools spec file, kexec-tools can now be built from source in the scenario described. On bit PowerPC-based systems with more than 1 TB of RAM, the kexec-tools utility terminated unexpectedly with a segmentation fault when kdump was started, thus preventing crash kernel capture. With this update, the problem has been fixed, kexec-tools no longer crashes, and kdump can now be used on a system with greater than 1 TB of physical memory.
The mkdumprd utility creates an initial RAM disk file system initrd for use in conjunction with the booting of a second kernel within the kdump framework for crash recovery. Prior to this update, mkdumprd became unresponsive when the running kernel was not the same as the target kernel. With this update the problem has been fixed and mkdumprd no longer hangs in the scenario described.
A regression caused the following erroneous error message to be displayed when kdump was setting up Ethernet network connections in order to reach a remote dump target:. A patch has been applied to correct the problem and the error no longer occurs in the scenario described. Due to improvements in conserving memory in the kexec kernel the warning is no longer considered valid.
This update removes the warning. Previously, if kexec-tools was installed and kdump was not running, installing the fence-agents package caused the following erroneous error message:. This update corrects the kexec-tools spec file and the erroneous error message no longer appears.
Removing kexec-tools on IBM System z resulted in the following error, even though the package was successfully removed. With this update, changes have been made to the kexec-tools spec file and the erroneous error message no longer appears. When providing firmware at operating system install time, supplied as part of the Driver Update program DUP , the installation completed successfully but the operating system would fail on reboot.
An error message in the following format was displayed:. With this update, a check for the directory containing the DUP supplied firmware is made and the problem no longer occurs. Enhancements BZ With large memory configurations, some machines take a long time to dump state information when a kernel panic occurs.
The cluster software sometimes forced a reboot before the dump completed. With this update, co-ordination between kdump and cluster fencing for long kernel panic dumps is added.
A new configuration option in kdump. When enabled, this option forces the kdump init script to rebuild initrd every time the system starts, thus ensuring kdump has enough storage space on each system start-up. PowerPC platforms currently cannot handle this feature. Kdump has been provided with an option so that memory usage can be logged in the second kernel at various stages for debugging memory consumption issues.
The second kernel memory usage debugging capability can be enabled via the new kdump. With this update, kdump support for dumping core to ext4 file systems, and also to XFS file systems on data disks but not the root disk has been added.
Layered products are those not included by default in the base Red Hat Enterprise Linux operating system. With this update, kdump support for dumping core to Btrfs file systems has been added. Btrfs itself is still considered experimental; refer to Red Hat Technical Notes. Kdump did not check the return code of the mount command.
With this update, the logic in the kdump service script has been improved and the kdump service script now functions as expected. Users of kexec-tools should upgrade to this updated package, which contains backported patches to resolve these issues and add these enhancements.
RHBA — kexec-tools bug fix update. Updated kexec-tools packages that fix one bug and add one enhancement are now available for Red Hat Enterprise Linux 6. The kexec fastboot mechanism allows booting a Linux kernel from the context of an already running kernel. BZ When running kdump after a kernel crash on the system using the ext4 file systems, the kdump initrd could have been created with the zero byte size.
This happened because the system waits for several seconds before writing the changes to the disk when using the ext4 file system. Consequently, the kdump initial root file system rootfs could not have been mounted and kdump failed. This update modifies kexec-tools to perform the sync operations after creating the initrd. This ensures that initrd is properly written to the disk before trying to mount rootfs so that kdump now successfully proceeds and captures a core dump.
Therefore, kdump failed to start if the guest had loaded PV drivers. All users of kexec-tools are advised to upgrade to these updated packages, which fix this bug add this enhancement.