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The StackGuard canary approach only works, of course, if the attacker cannot predict what the canary will be. If the canary were a fixed value, the attacker could simply rewrite the fixed value, and follow it by the return address of his choice. Instead, the canary value is chosen to be a random value, unpredictable to an attacker. If the canary has been modified, then it means that an attacker might be trying to overflow a buffer. In response to a corrupt canary, the code could halt the program to prevent an attacker from gaining control of the program. While StackGuard-type approaches help deal with some types of buffer overflow attacks, the protection they offer is not comprehensive. For more details, see Bypassing StackGuard and StackShield, by Bulba and Kil3r.

[Authorize(Users = "admin")] public ActionResult Admins() { return View(); }

The index of the current item that is activated. This item will be equal to the value returned by gtk_tree_path_ get_indices() for the selected row if it is not a root element. If set to TRUE, menus will have tear-off menu items if the combo box is using a menu style. If you want a value to span multiple columns in the list, set this to a nonnegative integer that points to a model column with the type G_TYPE_INT. This integer defines how many columns the value will span. If set to TRUE, the combo box will grab focus when the user clicks it. If set to TRUE, a frame will be drawn around the selected item. The tree model that holds the choices for the combo box. If set to TRUE, the combo box is currently displaying choices. You can connect to this with the notify signal to receive notification of when the user is shown the pop-up window. This property performs the same functionality as column-span-column except in the vertical direction.

Hard-coding a username like this may be too tightly controlling. Users come and go, and the duties of a given user may change during their time using the application. Instead of requiring a specific user, it usually makes sense to require a role. Listing 11.3 demonstrates how developers can use AuthorizeAttribute to restrict an action to certain roles.

The title to display when the pop-up window of combo box choices is torn from its original placement. You can set this property to a positive integer so that a list can be displayed in multiple columns. This property defines the number of columns.

There are alternative approaches and tools that can be used to find buffer overflows (as well as other security bugs). Static analysis is one such approach. Static analysis is a type of analysis that can be done to programs without running them. With respect to security, there are various types of checks that are interesting for a static analysis tool to conduct. For instance, when a function receives input from a caller, that input can be considered tainted until it is checked (to make sure that it is not null, or that it has been sanitized by a check function prior to further use). Very often, compilers have all the mechanisms required to do such checks, but do not have the specific knowledge of what types of static analysis checks make sense for an application. Dawson Engler s research group at Stanford University identified the opportunity to do meta-level compilation, in which compilers can be extended with declarations that give them such knowledge, and can be used to find security as well as other types of bugs (Engler et al. 2000). Meta-level compilation can also detect frequent patterns and idioms used in code, and report a warning or error when some anomalous part of the code does not follow the pattern, possibly indicating a bug. Synchronization and memory bugs, in addition to security bugs, can be found using static analysis. Companies such as Coverity (www.coverity.com),7 Fortify (www.fortifysoftware.com), Ounce Labs (www.ouncelabs.com), and Klocwork (www.klocwork.com) build static analysis and other tools that allow you to scan through your code to identify security and other types of bugs. It is worthwhile to use them, since such tools have successfully found many bugs in OS and application code that has been tested, reviewed, and deployed. For instance, the Coverity

[Authorize(Roles = "admins, developers")] public ActionResult Developers() { return View(); }

An integer defining the number of pixels to place along the outside of a container s children. A child widget of the container. You can add a new child to the container with this property. However, this property should not be used if the container holds multiple children. Defines how to handle resize requests of a container and its children.