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This chapter has so far focused on stack-based buffer overflows. Stack-based overflows are buffer overflows in which the attacker overwrites memory on the program stack. Alternatively, in a heap-based buffer overflow, an attacker can overwrite buffers that are stored on the heap. Whenever malloc() or its relatives are called in C to allocate memory, a fixed-size buffer allocated on the heap is returned. While such buffers can be reallocated to be larger in size, a call to a function such as realloc() must take place. Between the time that malloc() and realloc() are called, the buffer is of a fixed size. During that time, an attacker can attempt to feed user input into that buffer and overwrite data on the heap that is adjacent to the buffer. Of course, exactly what data is adjacent to the buffer on the heap is a bit less predictable than in the case of stack-based overflows but such techniques are nonetheless used by hackers. Heap-based buffer overflows can be prevented in the same way that stack-based buffer overflows can be in both cases, it is critical that memory is not written to beyond the bounds of a buffer. If malicious inputs can find their way into unexpected places of memory and modify the control path of your program, it may be game over. Buffer overflows are only one way that an attacker can take control of your program. The following chapters explore other attacks in which malicious input can influence the control flow of a program without overflowing a buffer.

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You can also use an AuthKit permission object named UserIn to specify that only certain users are allowed. Add another user to the config file like this: authkit.form.authenticate.user.data = visitor:open_sesame nobody:password Then change the way the permission is used like this: @authorize(UserIn(["visitor"])) def private(self): return "You are authenticated!" This time, even if you signed in as nobody, you would still not be authorized to access the action because the permission check will authorize only the user named visitor.

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The dependency of ctags for code completion and method lists means that the interface can be slow because ctags is run as an external process, and QDevelop waits for it to complete before these features actually work. QDevelop does have an annoying bug. When requesting help for a member function of a Qt class, it fails. You must always position the cursor over the actual class name when looking for help. When Qt Assistant is launched to provide help, it launches as a separate application. QDevelop launches both Designer and Qt Assistant as external applications running in parallel with the QDevelop application. This works great, but you have to switch manually back and forth between the applications.

You don t actually need to instantiate a permission in the decorator itself; you can also create a permission instance elsewhere and use it as many times as you like in different authorize() decorators.

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The buffer overflow vulnerabilities that we have discussed in this chapter are an example of, more generally, memory corruption vulnerabilities. In a memory corruption vulnerability, the attacker takes advantage of a programmer s error in memory management. To illustrate two other types of memory corruption vulnerabilities, we briefly consider format string vulnerabilities and integer overflows. Format string and integer overflow vulnerabilities can be used to accomplish a variety of attacks, from crashing a program to taking full control of it. Since much of this chapter is about buffer overflow vulnerabilities, we show how format strings and integer overflow vulnerabilities can be used to overflow buffers. However, format strings and integer overflows can be used to conduct many other types of attacks as well.

You ve now seen how to use the @authorize decorator to check permissions before an action is called, but there are actually two other ways of checking permissions that automatically raise the correct PermissionError if a permission check fails: The authorize middleware for protecting a whole WSGI application The authorized() function for checking a permission within a code block Let s look at these next.

Category: Development environment Website: http://edyuk.sf.net License: GPL Edyuk is another cross-platform, integrated development environment designed for use with Qt. Edyuk, which is built around perspectives and plugins, integrates both Designer and Qt Assistant fully, so you can switch between code view and Designer within the Edyuk environment. Figure A-4 shows screenshots that display the code perspective (top) and the Designer perspective (bottom). The project file support is good, as is the code editor, but opening projects can be scary because the user interface can sometimes be unresponsive while loading. However, the development pace is high (at the time of writing this book), so this situation will probably have improved by the time that you read this.

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