How to Patch Linux Systems to Protect Against the GHOST Vulnerability

Bob Cromwell, the other security author on this blog, wrote about the GHOST vulnerability in the Linux glibc library. He explained what glibc (“the C library”) is and about the origin of the GHOST vulnerability. He ended with, “Patches are easy to check and easy to apply, so keep your servers safe!” Since I updated […]
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How to Make the vi Editor in UNIX Even More Powerful and Friendly

The vi editor is the standard editor for the UNIX family of operating systems. It will be there, and as long as you get your terminal type correctly defined (VT100 is usually a safe and adequate choice), it will work. It doesn’t need graphics, and it does not rely on having the special keys defined. […]
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How to Protect your GNU C Library from the Linux Ghost Bug

The recent “Ghost” bug has brought some attention to the GNU C Library or glibc. What is glibc? First, get your Linux systems patched! Patches are available, get your system updated and protected! If you are curious about the details of Ghost, see the announcement from Qualys or their detailed analysis. OK, now that your […]
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How Does Linux Boot? Part 6: Replacing init With systemd – What You Need to Know

Last week I mentioned that systemd has replaced the traditional init program in Linux. Let’s see some capabilities it adds! Systemd organizes tasks into units which can include initializing hardware, mounting file systems, and starting services that will daemonize and run in the background. The active units are those which are enabled (that is, configured […]
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How Does Linux Boot? Part 5: The Kernel Starts The First Process

So far in our detailed tour of the Linux boot sequence (which started here) we have seen how the UEFI firmware on modern hardware can call a “shim” program to support Secure Boot, which in turn runs the GRUB boot loader to find, load, and start the kernel. The kernel has loaded device drivers for […]
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