PostgreSQL reconsiders its process-based model [LWN.net]
This article brought to you by LWN subscribersSubscribers to LWN.net made this article — and everything that surrounds it — possible. If you appreciate our content, please buy a subscription and make the next set of articles possible. In the fast-moving open-source world, programs can come and go quickly; a tool that has many users today can easily be eclipsed by something better next week. Even i
OpenBSD system-call-origin verification [LWN.net]
A new mechanism to help thwart return-oriented programming (ROP) and similar attacks has recently been added to the OpenBSD kernel. It will block system calls that are not made via the C library (libc) system-call wrappers. Instead of being able to string together some "gadgets" that make a system call directly, an attacker would need to be able to call the wrapper, which is normally at a randomiz
A block layer introduction part 1: the bio layer [LWN.net]
October 25, 2017 This article was contributed by Neil Brown One of the key values provided by an operating system like Linux is that it provides abstract interfaces to concrete devices. Though the original "character device" and "block device" abstractions have been supplemented with various others including "network device" and "bitmap display", the original two have not lost their importance. Th
Richard Stallman and the GNU project [LWN.net]
While Richard Stallman has resigned from the Free Software Foundation and MIT, he continues to hold onto his position as the head of the GNU project. Now, the FSF has announced that it is "working with GNU leadership on a shared understanding of the relationship for the future" and is seeking comments from the community on what that should be. Meanwhile, a group of maintainers for specific GNU pro
io_uring IO interface [LWN.net]
After some arm twisting from Christoph, I finally caved and divorced the aio-poll patches from aio/libaio itself. The io_uring interface itself is useful and efficient, and after rebasing all the new goodies on top of that, there was little reason to retail the aio connection. Hence io_uring was born. This is what I previously called scqring for aio, but now as a standalone entity. Patch #5 adds t
Emacs & TLS [LWN.net]
A recent query about the status of network security (TLS settings in particular) in Emacs led to a long thread in the emacs-devel mailing list. That thread touched on a number of different areas, including using OpenSSL (or other TLS libraries) rather than GnuTLS, what kinds of problems should lead to complaints out of the box, what settings should be the default, and when those settings could cha
The Emacs dumper dispute [LWN.net]
Please consider subscribing to LWNSubscriptions are the lifeblood of LWN.net. If you appreciate this content and would like to see more of it, your subscription will help to ensure that LWN continues to thrive. Please visit this page to join up and keep LWN on the net. The Emacs editor is, at its core, a C program, but much of the editor's functionality is actually implemented in its special "Elis
Why kernel development still uses email [LWN.net]
LWN.net needs you!Without subscribers, LWN would simply not exist. Please consider signing up for a subscription and helping to keep LWN publishing In a world full of fancy development tools and sites, the kernel project's dependence on email and mailing lists can seem quaintly dated, if not positively prehistoric. But, as Greg Kroah-Hartman pointed out in a Kernel Recipes talk titled "Patches car
/dev/random - a new approach [LWN.net]
Hi Herbert, Ted, The venerable Linux /dev/random served users of cryptographic mechanisms well for a long time. Its behavior is well understood to deliver entropic data. In the last years, however, the Linux /dev/random showed signs of age where it has challenges to cope with modern computing environments ranging from tiny embedded systems, over new hardware resources such as SSDs, up to massive p
Removing support for Emacs unexec from Glibc [LWN.net]
Did you know...?LWN.net is a subscriber-supported publication; we rely on subscribers to keep the entire operation going. Please help out by buying a subscription and keeping LWN on the net. The Emacs editor requires a lot of Lisp code and program state before it can start doing its job. That led Emacs developers to add the "unexec" feature to quickly load all of that at startup, but unexec has al
C11 atomic variables and the kernel [LWN.net]
Benefits for LWN subscribers The primary benefit from subscribing to LWN is helping to keep us publishing, but, beyond that, subscribers get immediate access to all site content and access to a number of extra site features. Please sign up today! The C11 standard added a number of new features for the C and C++ languages. One of those features — built-in atomic types — seems like it would naturall
rm -r fs/ext3 [LWN.net]
Benefits for LWN subscribersThe primary benefit from subscribing to LWN is helping to keep us publishing, but, beyond that, subscribers get immediate access to all site content and access to a number of extra site features. Please sign up today! The kernel development community is quite good at adding code to the kernel; its record on removing code is not always quite so bright. There are all kind
The SO_REUSEPORT socket option [LWN.net]
This article brought to you by LWN subscribersSubscribers to LWN.net made this article — and everything that surrounds it — possible. If you appreciate our content, please buy a subscription and make the next set of articles possible. One of the features merged in the 3.9 development cycle was TCP and UDP support for the SO_REUSEPORT socket option; that support was implemented in a series of patch
Control groups series by Neil Brown [LWN.net]
Here is a series of articles by Neil Brown that look at Linux control groups. As more articles are published, this page will be updated to serve as an index. Control groups, part 1: On the history of process grouping — a look at the history of grouping processes, going back to the early days of Unix. Control groups, part 2: On the different sorts of hierarchies — a look at hierarchies, including s
Supporting filesystems in persistent memory [LWN.net]
LWN.net needs you!Without subscribers, LWN would simply not exist. Please consider signing up for a subscription and helping to keep LWN publishing For a few years now, we have been told that upcoming non-volatile memory (NVM) devices are going to change how we use our systems. These devices provide large amounts (possibly terabytes) of memory that is persistent and that can be accessed at RAM spe
OSTree for Fedora [LWN.net]
Benefits for LWN subscribersThe primary benefit from subscribing to LWN is helping to keep us publishing, but, beyond that, subscribers get immediate access to all site content and access to a number of extra site features. Please sign up today! Linux distributions are typically delivered either in piecemeal fashion via packages or as a single bundle like Android or Chrome OS. Colin Walters's OSTr
Stable pages [LWN.net]
When a process writes to a file-backed page in memory (through either a memory mapping or with the write() system call), that page is marked dirty and must eventually be written to its backing store. The writeback code, when it gets around to that page, will mark the page read-only, set the "under writeback" page flag, and queue the I/O operation. The write-protection of the page is not there to p
CentOS security alerts [LWN.net]
Recent CentOS security alerts (3136 alerts total) IDPackageDate
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Are the BSDs dying? Some security researchers think so (CSO) [LWN.net]
Re: When should ralloc.c be used? (WAS: bug#24358) [LWN.net]