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snprintf provides a level of safety over sprintf since the caller provides a length (n) parameter that specifies the maximum number or chars to write to the buffer. For most printf-family functions, there is a variant that accepts va_list rather than a variable length parameter list. For example, there is a vfprintf, vsprintf, vsnprintf.
The C programming language provides many standard library functions for file input and output.These functions make up the bulk of the C standard library header <stdio.h>. [1] The functionality descends from a "portable I/O package" written by Mike Lesk at Bell Labs in the early 1970s, [2] and officially became part of the Unix operating system in Version 7.
PIE binaries are used in some security-focused Linux distributions to allow PaX or Exec Shield to use address space layout randomization (ASLR) to prevent attackers from knowing where existing executable code is during a security attack using exploits that rely on knowing the offset of the executable code in the binary, such as return-to-libc ...
Visualization of a software buffer overflow. Data is written into A, but is too large to fit within A, so it overflows into B.. In programming and information security, a buffer overflow or buffer overrun is an anomaly whereby a program writes data to a buffer beyond the buffer's allocated memory, overwriting adjacent memory locations.
Uncontrolled format string is a type of code injection vulnerability discovered around 1989 that can be used in security exploits. [1] Originally thought harmless, format string exploits can be used to crash a program or to execute harmful code.
The man page for the sed utility, as seen in various Linux distributions. A man page (short for manual page) is a form of software documentation found on Unix and Unix-like operating systems. Topics covered include programs, system libraries, system calls, and sometimes local system details. The local host administrators can create and install ...
It chronicles the history of Unix and how it led to the creation of Linux. The book provides samples of code written in C, and learning exercises at the end of chapters. The author is a former writer for the Linux Weekly News [1] and the current maintainer for the Linux man pages project. [2]
The GNU C Library, commonly known as glibc, is the GNU Project implementation of the C standard library.It provides a wrapper around the system calls of the Linux kernel and other kernels for application use.