GNU Rush 2.0 to be Available

Rush is created for systems with limited remote access, so, for example, it can be used to remotely launch programs in a chroot environment
03 July 2019   1423

GNU Rush 2.0 (Restricted User Shell), designed for use in systems with reduced remote access, which require restriction of user actions, is released. Rush makes it possible to determine which command line functions a user can use and what resources are provided to him (memory size, processor time, etc.).

For example, Rush can be used to remotely launch programs in a chroot environment, which helps increase security when providing access through programs such as sftp-server or scp, which by default have access to the entire file system. Another useful feature of Rush is to support sending a notification to another process about the end of a user session via a network or Unix socket. All connections through Rush are tracked and logged. To view a list of active users and their connection history, rushwho and rushlast utilities are offered.

In the new release, the configuration processing code has been completely rewritten and a new syntax of the file with the settings has been proposed (the old syntax support has been retained for backward compatibility). The new syntax offers new control structures and processing instructions for various operations.

Linux 5.3 Kernel to be Released

Huge amount of updates, improvements, changes and new features awaits all Linux users
17 September 2019   229

After two months of development, Linus Torvalds introduced the Linux 5.3 kernel release. Among the most notable changes: support for AMD Navi GPUs, Zhaoxi processors, and Intel Speed ​​Select power management technology, the ability to use umwait instructions to wait without using loops, increasing the interactivity utilization clamping mode for asymmetric CPUs, the pidfd_open system call, the ability to use IPv4 addresses from the subnet, the possibility of hardware acceleration of nftables, support for HDR in the DRM subsystem, integration of the ACRN hypervisor.

In the announcement of the new release, Linus reminded all developers of the main rule of kernel development - maintaining the invariance of behavior for user space components. Changes in the kernel should in no way violate already running applications and lead to user-level regressions. At the same time, a violation of behavior can cause not only a change in the ABI, removal of outdated code or errors, but also an indirect effect of correctly working useful improvements. As a good example, the useful optimization in Ext4 code was discarded, which reduces the number of accesses to the drive by disabling the read-ahead inode table for small I / O requests.

Optimization has led to the fact that, due to a decrease in disk activity, the entropy for the random number generator getrandom () began to accumulate more slowly and in some configurations, under certain circumstances, there could be hangs during loading until the entropy pool is full. Since the optimization is really useful, a discussion arose among the developers, in which it was proposed to eliminate the problem by disabling the default blocking mode of the getrandom () call with the addition of an optional flag to wait for entropy, but such a change will affect the quality of random numbers at the initial stage of loading. In the change rollback commit, Linus noted that he plans to bring the optimization back as soon as the problem with getrandom () is resolved.

The new version adopted 15794 patches from 1974 developers, the patch size is 92 MB (the changes affected 13986 files, 258419 lines of code were added, 599137 lines were deleted). About 39% of all the changes presented in 5.3 are related to device drivers, about 12% of changes are related to updating the code specific to hardware architectures, 11% are connected to the network stack, 3% to file systems and 3% to internal kernel subsystems.

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