![]() In order to detect this case, a “canary value” is added to the stack before other values are declared. The fundamental assumption behind the approach is that most stack buffer overflows occur by writing past the end of a function’s stack frame. In this article, we’ll discuss stack smashing protection (SSP), related compiler flags, and an implementation that is suitable for use on microcontrollers.Ĭlang, GCC, and related compilers implement stack smashing protection (SSP) using StackGuard. This support can be enabled in our programs by setting a few compiler flags. ![]() When conditions are right, an attacker can insert executable instructions into the program and gain unintended access to a system.Ĭlang, GCC, and other related compilers provide built-in support for detecting stack buffer overflows and aborting a program if one is detected. An attacker can deliberately trigger a stack buffer overflow as part of a “stack smashing” attack. These errors also create potential security vulnerabilities in our programs. A stack buffer overflow occurs when a program writes to a memory address on the stack which is outside of its current stack frame, often triggered by a buffer overflow on a local stack variable. Stack buffer overflows are a category of error that can wreak havoc on our programs, resulting in sporadic crashes or strange and unexpected program behaviors.
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