Without this modular capability, the Linux kernel would be very large, as it would have to support every driver that would ever be needed on the. O'Reilly Media, Inc. The Linux series designations, Linux Device Drivers, images of the American West, and related trade dress are trademarks of O'Reilly Media. This is the web site for the Third Edition of Linux Device Drivers, by Jonathan Corbet, Alessandro Rubini, and Greg Kroah-Hartman. For the moment, only the.


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Linux Driver Tutorial: How to Write a Simple Linux Device Driver

We will discuss security-related issues as they come up throughout the book. There are a few general concepts, however, that are worth mentioning now.

Any security check in the system is enforced by kernel code. If the kernel has security holes, then linux device driver system as a whole has holes.

Linux Device Drivers, Third Edition

Thus, when running an official kernel, only the superuser,[ 1 ] or an intruder who has succeeded in becoming privileged, linux device driver exploit the power of privileged code. When possible, driver writers should avoid encoding security policy in their code.


Security is a policy issue that is often best handled at higher levels within the kernel, under the control of the system administrator. Linux device driver are always exceptions, however. As a device driver writer, you should be aware of situations in which some types of device access could adversely affect the system as a whole and should provide adequate controls.

For example, device operations that affect global resources such as setting an interrupt linewhich could damage the hardware loading firmware, for exampleor that could linux device driver other users such as setting a default block size on a tape driveare usually only available to sufficiently privileged users, and this check must be made in the driver itself.

Driver writers must also be careful, of course, to avoid introducing security bugs.

Linux Device Drivers, 3rd Edition by Greg Kroah-Hartman, Alessandro Rubini, Jonathan Corbet

The C programming language makes it easy to make several types of errors. Many current security problems are created, for example, by buffer overrun errors, in linux device driver the programmer forgets to check how much data is written to a buffer, and data ends up written beyond the end of the buffer, thus overwriting unrelated data.

Such errors can compromise the entire system and must be avoided.

  • Linux Device Drivers, 2nd Edition: Online Book
  • Writing a Linux Kernel Module — Part 1: Introduction |
  • 1. An Introduction to Device Drivers - Linux Device Drivers, 3rd Edition [Book]
  • Writing a Linux Kernel Module — Part 1: Introduction
  • Writing a Linux Kernel Module — Part 1: Introduction

Fortunately, avoiding these errors is usually relatively easy in the device driver context, in which the interface to the user is narrowly defined and highly controlled. Some other general security ideas linux device driver worth keeping in mind.

Any input received from user processes should be treated with great suspicion; never trust it unless you can verify it.

Be careful with uninitialized memory; any memory obtained from the kernel should be zeroed or otherwise initialized before being made available to a user process or device. Linux device driver, information leakage disclosure of data, passwords, etc.

If your device interprets data sent to it, be sure the user cannot send anything that could compromise the system.

Finally, think about the possible effect of device operations; if there are specific operations e. Be careful, also, when receiving software from third parties, especially when the kernel is concerned: Although linux device driver can usually trust precompiled kernels found in your distribution, you should avoid running kernels compiled by an untrusted friend—if you wouldn't run a precompiled binary as root, then you'd better not run a precompiled kernel.

Linux Driver Tutorial: How to Write a Simple Linux Device Driver

Note that the Linux kernel can be compiled to have no module support whatsoever, thus closing any module-related security holes. In this linux device driver, of course, all needed drivers must be built directly into the kernel itself.

It is also possible, with 2.

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