prctl(PR_SET_NO_NEW_PRIVS, 1); 1. 开启保护功能: 通过PR_SET_SECCOMP参数,启用 seccomp 模式(安全计算模式),从而限制进程可以调用的系统调用的范围,以增强安全性。 prctl(PR_SET_SECCOMP, SECCOMP_MODE_STRICT); 1. 常见使用场景 守护进程管理: 通过PR_SET_PDEAT
在include/linux/prctl.h中找到PR_SET_NO_NEW_PRIVS常量对应的数值,正好是 38,因此也就对应上了题目中的第一个 prctl 语句,那很明显 v4 就是一个设置规则的结构体指针,我们完全可以覆盖他来构造沙箱规则。 接着看第二个optionsPR_SET_SECCOMP: Setthe secure computing (seccomp) modeforthe calling thread,to...
to limit the available system calls. The more recentseccomp(2)system call provides a superset of the functionality of PR_SET_SECCOMP. The seccomp mode is selected via arg2.(The seccomp constants are defined in <linux/seccomp.h>.)With arg2setto SECCOMP_MODE_STRICT, the only system calls th...
PR_SET_SECCOMP (since Linux 2.6.23) Set the secure computing (seccomp) mode for the calling thread, to limit the available system calls. The more recent seccomp(2) system call provides a superset of the functionality of PR_SET_SECCOMP. The seccomp mode is selected via arg2. (The seccomp...
and spectre_v2_user=seccomp,ibpb, prctl(PR_GET_SPECULATION_CTRL) would return PR_SPEC_PRCTL | PR_SPEC_ENABLE instead of PR_SPEC_DISABLE since both IBPB and STIPB are always on. It also allowed prctl(PR_SET_SPECULATION_CTRL) to set the IB speculation mode, even though the flag is ...