Stack smashing is another name for stack buffer overflow. Therefore, stack protection is off by default in the current version of gcc in Debian 10. We can enable it using the -fstack-protector option, as we’ve just seen. However, stack protection may be on by default in old or other ...
We may * be in an interrupt or a critical region, and should * only copy the information from the master page table, * nothing more. * * This verifies that the fault happens in kernel space * (error_code & 4) == 0, and that the fault was not a * protection error (error_code ...
Enable -fstack-protector buffer overflow detectionCONFIG_CC_STACKPROTECTOR 开启GCC的"-fstack-protector"命令行选项,以使用GCC中的编译器堆栈保护技术.这样可以有效的防御以堆栈溢出为代表的缓冲区溢出攻击,不过系统的运行速度也会受到一些影响.服务器之类强调安全的场合建议开启,个人PC之类的就不是很有必要了. Timer ...
第一类是probabilistic protection,概率性防御或漏洞缓解,增加攻击者利用漏洞的难度,典型的如KASLR(Kernel Address Space Layout Randomization)内核地址随机化。 第二类是deterministic protection,确定性防御,即修复/封堵攻击者可能利用的缺陷和路径,如内存保护方案中的W^X(堆、栈内存不可执行,无法在堆栈内存上部署恶意代码...
* to avoid risk of stack overflow. But avoid * injecting inefficient single-folio I/O into * flusher writeback as much as possible: only * write folios when we've encountered many * dirty folios, and when we've already scanned * the rest of the LRU for clean folios and see ...
2002/05/17 Grsecurity Kernel Patch 1.9.4(Linux Kernel) - MemoryProtection Guillaume PELAT 2002/03/26 Linux Kernel 2.2.x/2.3/2.4.x- 'd_path()' Path Truncation cliph 2002/02/25 Century Software Term ForLinux 6.27.869 - CommandLine Buffer Overflow Haiku Hacker 2000/08/25 User-Mode Linux ...
At its core, the buffer overflow is an astonishingly simple bug that results from a common practice. Computer programs frequently operate on chunks of data that are read from a file, from the network, or even from the keyboard. Programs allocate finite-s
参考:https://github.com/hardenedlinux/grsecurity-101-tutorials/blob/master/grsec-code-analysis/KSTACKOVERFLOW.md 以下是另外两个相关的防御机制 VMAP_STACK 这个机制是采用vmalloc申请的内存作为内核栈,这样可以利用vmalloc自带的guard page增强栈溢出检测能力,同时这些申请的内存空间在物理上可能是不连续的,能够减少...
Red Hat Enterprise Linux also includes a set of technologies which can greatly reduce the chance of Linux-specific exploits. One example found in Red Hat Enterprise Linux 3 and above versions is ExecShield, which helps to eliminate memory buffer overflow exploits . Another example available in Red...
* This function is vulnerable to a buffer overflow. Our goal is to * overwrite the return address with 0x41414141 which is the addresses * that we mmap() and store our shellcode in. */ int vuln(char *s) { char buf[32]; int i; ...