Linux Format: Issue 158 (June 2012) - Beat the C.I.A.

Hold prying eyes from your Linux field – together with these of the CIA!

There`s constantly a person attempting to get into your facts, even if that be an assurance corporation eager to learn how a lot of a probability you're, a non-evil seek engine corporation desirous to goal its advertisements at you or a central authority employer attempting to expand the powers of the country onto your harddrive. yet assistance is to hand: with our final consultant to privateness and knowledge security you could preserve all of them from your /home folder, no matter what their nefarious intentions.

Elsewhere within the journal we`re packed with the right way to map your perambulations with GPS, provoke easily-impressed women by means of getting them to the touch your Android cellphone, and extend the boundaries of your computing wisdom with our roundup of other working systems.

PLUS we blow our tiny minds studying the best way to make a operating CPU out of common sense gates, get at terrifying glimpse into the long run with Oil Rush, and examine what quilting has in universal with Linuxing. All this, plus the standard heady mixture of tutorials, in Linux layout 158!

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424 this bit indicates that if the process terminates abnormally, it is to produce a core image on disk. It is set by functions that implement exec(). 4). 426–428 these bits are set and tested by various routines within the memory manager. They will not be considered any further here. 429 when this bit is set, the process does not generate any further I/O. As this is the province of the I/O manager, it will not be considered further in this book. 2), and is afterwards manipulated only by architecture-specific code.

10). 10 Process credentials and limits Line 368: uid, euid, suid, fsuid These are the user identifiers associated with the process. The operating system uses these IDs to determine whether or not to grant a process access to specific system resources. The real user ID (uid), that is the ID of the user that created the process, is in uid. The effective uid (euid) is in euid; effective IDs can be acquired temporarily. The saved uid is suid, and the uid used for file access is in fsuid. When a program is run, its effective uid is saved to its suid.

14 Line 387: thread There is really no fundamental distinction between the terms ‘task’, ‘process’, and ‘thread’ in Linux. However, the sources do seem to reserve the identifier ‘thread’ for architecturespecific details. , shows the thread_struct used with the i386 architecture. This contains all the state information that must be saved when a process is context switched out. Context switches always occur in kernel mode. Most of the hardware register values have already been saved on entry to the kernel.

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