1/10/2023 0 Comments Inconsistent extfs archive![]() After the crash, the system boots and wishes to mount the file system again (in order to access files and such). And thus, we have a problem that all file systems need to solve: THE CRUX: HOW TO UPDATE THE DISK DESPITE CRASHES The system may crash or lose power between any two writes, and thus the on-disk state may only partially get updated. If the system crashes or loses power after one write s, the on-disk structure will be left in an inconsistent state. Because the disk only services a single request at a time, one of these requests will reach the disk first (either A or B). Imagine you have to update two on-disk structures, A and B, in order to a particular operation. This problem is quite simple to understand. Specifically, what happens if, right in the middle of updating on-disk structures, someone trips over the power cord and the machine loses power? Or the operating system encounters a bug and crashes? Because of power losses and crashes, updating a persistent data structure can be quite tricky, and leads to a new and interesting problem in file system implementation, known as the crash-consistency problem. One major challenge faced by a file system is how to update persistent data structures despite the presence of a power loss or system crash. Unlike most data structures (for example, those found in memory of a running program), file system data structures must persist, i.e., they must survive over the long haul, stored on devices that retain data despite power loss (such as hard disks or flash-based SSDs). Ext GWT: User Extensions and Plugins (1.1 42 Crash Consistency: FSCK and ing As we ve seen thus far, the file system manages a set of data structures to implement the expected abstractions: files, directories, and all of the other metadata needed to support the basic abstraction that we expect from a file system.Sencha Touch 1.x: Examples and Showcases.Ext GWT Community Forums (2.x) - Unsupported.Ext JS Community Forums 4.x - Unsupported.Ext JS Community Forums 5.x - Unsupported.Sencha Touch 2.x: Examples and Showcases.Sencha Architect 2.x: Help & Discussions.Sencha Architect User Extensions/Templates.Select the forum that you want to visit from the selection below. If this is your first visit, you may have to registerīefore you can post. If you have any questions or concerns please contact us. Idera does not use JMSAppender within our products so we are not impacted by this new CVE. Note this issue only affects Log4j 1.2 when specifically configured to use JMSAppender, which is not the default. The attacker can provide TopicBindingName and TopicConnectionFactoryBindingName configurations causing JMSAppender to perform JNDI requests that result in remote code execution in a similar fashion to CVE-2021-44228. JMSAppender in Log4j 1.2 is vulnerable to deserialization of untrusted data when the attacker has write access to the Log4j configuration. For specific security bulletin updates regarding Qubole and Xblend / Xray, please review the information provided in the support portals for those products.Īlthough our initial and thorough investigation has concluded, Idera continues to monitor for potential breaches, we will continue actively to monitor this situation and communicate with stakeholders as appropriate. Therefore, the investigation confidently concludes none are impacted by the Apache Log4j vulnerability. Idera has completed its review / investigation on all family of products.įor products supported in this portal, our investigation confirmed there are no exposed instances of the Apache Log4j library within the version range that contains this vulnerability. This is an update of Idera's internal review of the Log4J Issue (CVE-2021-44228). NOTE: This incident is no longer considered active, but is being maintained as Monitoring for short-term visibility. ![]() Security Bulletin Update - Log4J Issue (CVE-2021-44228)
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