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A kernel oops often leads to a kernel panic when the system attempts to use resources that have been lost. Some kernels are configured to panic when many oopses (10,000 by default) have occurred. Some kernels are configured to panic when many oopses (10,000 by default) have occurred.
The basic assumption is that the hardware and the software should perform correctly and a failure of an assertion results in a panic, i.e. a voluntary halt to all system activity. [5] The kernel panic was introduced in an early version of Unix and demonstrated a major difference between the design philosophies of Unix and its predecessor Multics.
A kernel panic is the Unix equivalent of Microsoft's Blue Screen of Death. It is a routine called when the kernel detects irrecoverable errors in runtime correctness; in other words, when continuing the operation may risk escalating system instability, and a system reboot is easier than attempted recovery.
In April 2024, it was revealed that the BHI vulnerability in certain Intel CPU families could be still exploited in Linux entirely in user space without using any kernel features or root access despite existing mitigations. [76] [77] [78] Intel recommended "additional software hardening". [79] The attack was assigned CVE-2024-2201.
File system mazes force the victim to read a directory entry that is not in the OS cache, and the OS puts the victim to sleep while it is reading the directory from disk. Algorithmic complexity attacks force the victim to spend its entire scheduling quantum inside a single system call traversing the kernel's hash table of cached file names.
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Linux Security Modules (LSM) is a framework allowing the Linux kernel to support, without bias, a variety of computer security models.LSM is licensed under the terms of the GNU General Public License and is a standard part of the Linux kernel since Linux 2.6.