Buffer overflow protection is any of various techniques used during software development to enhance the security of executable programs by detecting buffer overflows on stack-allocated variables, and preventing them from causing program misbehavior or from becoming serious security vulnerabilities. A stack buffer overflow occurs when a program writes to a memory address on the program's call stack outside of the intended data structure, which is usually a fixed-length buffer. Stack buffer overflow bugs are caused when a program writes more data to a buffer located on the stack than what is actually allocated for that buffer. This almost always results in corruption of adjacent data on the stack, which could lead to program crashes, incorrect operation, or security issues.
Typically, buffer overflow protection modifies the organization of stack-allocated data so it includes a canary value that, when destroyed by a stack buffer overflow, shows that a buffer preceding it in memory has been overflowed. By verifying the canary value, execution of the affected program can be terminated, preventing it from misbehaving or from allowing an attacker to take control over it. Other buffer overflow protection techniques include bounds checking, which checks accesses to each allocated block of memory so they cannot go beyond the actually allocated space, and tagging, which ensures that memory allocated for storing data cannot contain executable code.
Overfilling a buffer allocated on the stack is more likely to influence program execution than overfilling a buffer on the heap because the stack contains the return addresses for all active function calls. However, similar implementation-specific protections also exist against heap-based overflows.
There are several implementations of buffer overflow protection, including those for the GNU Compiler Collection, LLVM, Microsoft Visual Studio, and other compilers.
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Bufferoverflowprotection is any of various techniques used during software development to enhance the security of executable programs by detecting buffer...
information security, a bufferoverflow or buffer overrun is an anomaly whereby a program writes data to a buffer beyond the buffer's allocated memory, overwriting...
In software, a stack bufferoverflow or stack buffer overrun occurs when a program writes to a memory address on the program's call stack outside of the...
A heap overflow, heap overrun, or heap smashing is a type of bufferoverflow that occurs in the heap data area. Heap overflows are exploitable in a different...
Function prologue and epilogue also sometimes contain code for bufferoverflowprotection. A function prologue typically does the following actions if the...
tools a hacker has to compromise operating systems of today is the bufferoverflow. C, in particular, uses the most primitive and error-prone way to mark...
run Windows Mobile, released in November 2002 Canary value, a bufferoverflowprotection method in computer programming Canary, LLC, an oilfield services...
read from it. The term is distinct from bufferoverflow, a condition where a portion of memory forms a buffer of a fixed size yet is filled with more...
of its software by default using gcc features such as PIE and bufferoverflowprotection, unlike operating systems such as OpenBSD, but tries to build...
Ubuntu compiles its packages using GCC features such as PIE and bufferoverflowprotection to harden its software.[relevant? – discuss] These extra features...
points to memory that has been freed/deallocated/deleted) A bufferoverflow A stack overflow Attempting to execute a program that does not compile correctly...
Yong-Joon and Gyungho Lee, "Repairing return address stack for bufferoverflowprotection," Proceedings of the 1st conference on Computing frontiers, ACM...
directly mapped shadow memory to detect memory corruption such as bufferoverflows or accesses to a dangling pointer (use-after-free). Google's ASan,...
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of a computer program's memory that helps software developers find bufferoverflows while developing the program. When a program is compiled for debugging...
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control-flow integrity techniques, including stack canaries, bufferoverflowprotection, shadow stacks, and vtable pointer verification, are used to defend...
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from within this section; one class of such attacks is known as the bufferoverflow attack. The term NX bit originated with Advanced Micro Devices (AMD)...
by exploiting a bufferoverflow in the LSASS on Windows XP and Windows 2000 operating systems. "Configuring Additional LSA Protection". Microsoft. Retrieved...
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